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Changes In Branch tkt-4a4e443ce9-pt-oo-fail Excluding Merge-Ins

This is equivalent to a diff from d29f257cb9 to 2a77eead81

2015-06-10
17:47
pt::rde(::oo) - Merging work on engine debugging (narrative) back, making it visible/official. check-in: 310ee6d508 user: aku tags: trunk
17:45
Updated to trunk. Closed-Leaf check-in: 2a77eead81 user: aku tags: tkt-4a4e443ce9-pt-oo-fail
17:44
pt::rde(::oo) - Fixed copyright years. Fixed version mismatch in the C code. Removed irrelevant requirement. Work on the narrative and internals complete. check-in: fd7bcc6781 user: aku tags: tkt-4a4e443ce9-pt-oo-fail
2015-06-09
01:21
Normalizing the API for zipfile::mkzip to the version checked into ODIE (Which also follows the design pattern laid down by zipfile::decode and zipfile::encode) check-in: d29f257cb9 user: hypnotoad tags: trunk
2015-06-08
20:30
multiplexer - Ticket [ced089d5fe]. Merged testsuite fix. Thanks Aspect. check-in: debee3c876 user: aku tags: trunk

Changes to modules/pt/pkgIndex.tcl.

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package ifneeded pt::peg::to::tclparam  1.0.3 [list source [file join $dir pt_peg_to_tclparam.tcl]]

# Import core functionality: Conversion from a specific format to PEG.
package ifneeded pt::peg::from::json      1 [list source [file join $dir pt_peg_from_json.tcl]]
package ifneeded pt::peg::from::peg   1.0.3 [list source [file join $dir pt_peg_from_peg.tcl]]

# PARAM runtime.
package ifneeded pt::rde      1.0.3 [list source [file join $dir pt_rdengine.tcl]]
package ifneeded pt::rde::oo  1.0.3 [list source [file join $dir pt_rdengine_oo.tcl]]

# PEG grammar specification, as CONTAINER
package ifneeded pt::peg::container::peg 1 [list source [file join $dir pt_peg_container_peg.tcl]]

# */PARAM support (canned configurations).
package ifneeded pt::cparam::configuration::critcl  1.0.2 [list source [file join $dir pt_cparam_config_critcl.tcl]]
package ifneeded pt::cparam::configuration::tea     0.1   [list source [file join $dir pt_cparam_config_tea.tcl]]








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package ifneeded pt::peg::to::tclparam  1.0.3 [list source [file join $dir pt_peg_to_tclparam.tcl]]

# Import core functionality: Conversion from a specific format to PEG.
package ifneeded pt::peg::from::json      1 [list source [file join $dir pt_peg_from_json.tcl]]
package ifneeded pt::peg::from::peg   1.0.3 [list source [file join $dir pt_peg_from_peg.tcl]]

# PARAM runtime.
package ifneeded pt::rde      1.1 [list source [file join $dir pt_rdengine.tcl]]
package ifneeded pt::rde::oo  1.1 [list source [file join $dir pt_rdengine_oo.tcl]]

# PEG grammar specification, as CONTAINER
package ifneeded pt::peg::container::peg 1 [list source [file join $dir pt_peg_container_peg.tcl]]

# */PARAM support (canned configurations).
package ifneeded pt::cparam::configuration::critcl  1.0.2 [list source [file join $dir pt_cparam_config_critcl.tcl]]
package ifneeded pt::cparam::configuration::tea     0.1   [list source [file join $dir pt_cparam_config_tea.tcl]]
︙︙

Changes to modules/pt/pt_rdengine.man. 

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[vset VERSION 1.0.3]
[comment {-*- text -*- doctools manpage}]
[manpage_begin pt::rde n [vset VERSION]]
[include include/module.inc]
[titledesc {Parsing Runtime Support, PARAM based}]
[require pt::rde [opt [vset VERSION]]]
[require snit]
[require struct::stack 1.4]
[require pt::ast 1.1]
[description]
[include include/ref_intro.inc]

This package provides a class whose instances provide the runtime
support for recursive descent parsers with backtracking, as is needed
for the execution of, for example, parsing expression grammars. It

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[vset VERSION 1.1]
[comment {-*- text -*- doctools manpage}]
[manpage_begin pt::rde n [vset VERSION]]
[include include/module.inc]
[titledesc {Parsing Runtime Support, PARAM based}]
[require pt::rde [opt [vset VERSION]]]
[require snit]
[require struct::stack 1.5]
[require pt::ast 1.1]
[description]
[include include/ref_intro.inc]

This package provides a class whose instances provide the runtime
support for recursive descent parsers with backtracking, as is needed
for the execution of, for example, parsing expression grammars. It
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Changes to modules/pt/pt_rdengine.tcl. 

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# -*- tcl -*-
#
# Copyright (c) 2009-2014 by Andreas Kupries <[email protected]>

# # ## ### ##### ######## ############# #####################
## Package description

## Implementation of the PackRat Machine (PARAM), a virtual machine on
## top of which parsers for Parsing Expression Grammars (PEGs) can be
## realized. This implementation is tied to Tcl for control flow. We



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# -*- tcl -*-
#
# Copyright (c) 2009-2015 by Andreas Kupries <[email protected]>

# # ## ### ##### ######## ############# #####################
## Package description

## Implementation of the PackRat Machine (PARAM), a virtual machine on
## top of which parsers for Parsing Expression Grammars (PEGs) can be
## realized. This implementation is tied to Tcl for control flow. We
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# @mdgen EXCLUDE: pt_rdengine_c.tcl

package require Tcl 8.5

namespace eval ::pt::rde {}

# # ## ### ##### ######## ############# #####################







## Management of stack implementations.

# ::pt::rde::LoadAccelerator --
#
#	Loads a named implementation, if possible.
#
# Arguments:
#	key	Name of the implementation to load.
#
# Results:
#	A boolean flag. True if the implementation
#	was successfully loaded; and False otherwise.

proc ::pt::rde::LoadAccelerator {key} {

    variable accel
    set r 0
    switch -exact -- $key {
	critcl {
	    if {![package vsatisfies [package provide Tcl] 8.5]} {return 0}
	    if {[catch {package require tcllibc}]} {return 0}
	    set r [llength [info commands ::pt::rde_critcl]]
	}
	tcl {
	    variable selfdir
	    source [file join $selfdir pt_rdengine_tcl.tcl]
	    set r 1
	}
        default {
            return -code error "invalid accelerator/impl. package $key:\
                must be one of [join [KnownImplementations] {, }]"
        }
    }
    set accel($key) $r

    return $r
}

# ::pt::rde::SwitchTo --
#
#	Activates a loaded named implementation.
#
# Arguments:
#	key	Name of the implementation to activate.
#
# Results:
#	None.

proc ::pt::rde::SwitchTo {key} {

    variable accel
    variable loaded

    if {$key eq $loaded} {
	# No change, nothing to do.

	return
    } elseif {$key ne {}} {
	# Validate the target implementation of the switch.


	if {![info exists accel($key)]} {
	    return -code error "Unable to activate unknown implementation \"$key\""
	} elseif {![info exists accel($key)] || !$accel($key)} {
	    return -code error "Unable to activate missing implementation \"$key\""
	}
    }

    # Deactivate the previous implementation, if there was any.

    if {$loaded ne {}} {

	rename ::pt::rde ::pt::rde_$loaded
    }

    # Activate the new implementation, if there is any.

    if {$key ne {}} {

	rename ::pt::rde_$key ::pt::rde
    }

    # Remember the active implementation, for deactivation by future
    # switches.

    set loaded $key

    return
}

# ::pt::rde::Implementations --
#
#	Determines which implementations are
#	present, i.e. loaded.
#
# Arguments:
#	None.
#
# Results:
#	A list of implementation keys.

proc ::pt::rde::Implementations {} {

    variable accel
    set res {}
    foreach n [array names accel] {
	if {!$accel($n)} continue
	lappend res $n
    }

    return $res
}

# ::pt::rde::KnownImplementations --
#
#	Determines which implementations are known
#	as possible implementations.
#
# Arguments:
#	None.
#
# Results:
#	A list of implementation keys. In the order
#	of preference, most prefered first.

proc ::pt::rde::KnownImplementations {} {

    return {critcl tcl}
}

proc ::pt::rde::Names {} {

    return {
	critcl {tcllibc based}
	tcl    {pure Tcl}
    }
}

# # ## ### ##### ######## ############# #####################








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# @mdgen EXCLUDE: pt_rdengine_c.tcl

package require Tcl 8.5

namespace eval ::pt::rde {}

# # ## ### ##### ######## ############# #####################
## Support narrative tracing.

package require debug
debug level  pt/rdengine
debug prefix pt/rdengine {}

# # ## ### ##### ######## ############# #####################
## Management of RDengine implementations.

# ::pt::rde::LoadAccelerator --
#
#	Loads a named implementation, if possible.
#
# Arguments:
#	key	Name of the implementation to load.
#
# Results:
#	A boolean flag. True if the implementation
#	was successfully loaded; and False otherwise.

proc ::pt::rde::LoadAccelerator {key} {
    debug.pt/rdengine {[info level 0]}
    variable accel
    set r 0
    switch -exact -- $key {
	critcl {
	    if {![package vsatisfies [package provide Tcl] 8.5]} {return 0}
	    if {[catch {package require tcllibc}]} {return 0}
	    set r [llength [info commands ::pt::rde_critcl]]
	}
	tcl {
	    variable selfdir
	    source [file join $selfdir pt_rdengine_tcl.tcl]
	    set r 1
	}
        default {
            return -code error "invalid accelerator/impl. package $key:\
                must be one of [join [KnownImplementations] {, }]"
        }
    }
    set accel($key) $r
    debug.pt/rdengine {[info level 0] ==> ($r)}
    return $r
}

# ::pt::rde::SwitchTo --
#
#	Activates a loaded named implementation.
#
# Arguments:
#	key	Name of the implementation to activate.
#
# Results:
#	None.

proc ::pt::rde::SwitchTo {key} {
    debug.pt/rdengine {[info level 0]}
    variable accel
    variable loaded

    if {$key eq $loaded} {
	# No change, nothing to do.
	debug.pt/rdengine {[info level 0] == $loaded /no change}
	return
    } elseif {$key ne {}} {
	# Validate the target implementation of the switch.
	debug.pt/rdengine {[info level 0] validate}

	if {![info exists accel($key)]} {
	    return -code error "Unable to activate unknown implementation \"$key\""
	} elseif {![info exists accel($key)] || !$accel($key)} {
	    return -code error "Unable to activate missing implementation \"$key\""
	}
    }

    # Deactivate the previous implementation, if there was any.

    if {$loaded ne {}} {
	debug.pt/rdengine {[info level 0] disable $loaded}
	rename ::pt::rde ::pt::rde_$loaded
    }

    # Activate the new implementation, if there is any.

    if {$key ne {}} {
	debug.pt/rdengine {[info level 0] enable $key}
	rename ::pt::rde_$key ::pt::rde
    }

    # Remember the active implementation, for deactivation by future
    # switches.

    set loaded $key
    debug.pt/rdengine {[info level 0] /done}
    return
}

# ::pt::rde::Implementations --
#
#	Determines which implementations are
#	present, i.e. loaded.
#
# Arguments:
#	None.
#
# Results:
#	A list of implementation keys.

proc ::pt::rde::Implementations {} {
    debug.pt/rdengine {[info level 0]}
    variable accel
    set res {}
    foreach n [array names accel] {
	if {!$accel($n)} continue
	lappend res $n
    }
    debug.pt/rdengine {[info level 0] ==> ($res)}
    return $res
}

# ::pt::rde::KnownImplementations --
#
#	Determines which implementations are known
#	as possible implementations.
#
# Arguments:
#	None.
#
# Results:
#	A list of implementation keys. In the order
#	of preference, most prefered first.

proc ::pt::rde::KnownImplementations {} {
    debug.pt/rdengine {[info level 0]}
    return {critcl tcl}
}

proc ::pt::rde::Names {} {
    debug.pt/rdengine {[info level 0]}
    return {
	critcl {tcllibc based}
	tcl    {pure Tcl}
    }
}

# # ## ### ##### ######## ############# #####################
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## Ready

namespace eval ::pt {
    # Export the constructor command.
    namespace export rde
}

package provide pt::rde 1.0.3








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## Ready

namespace eval ::pt {
    # Export the constructor command.
    namespace export rde
}

package provide pt::rde 1.1

Changes to modules/pt/pt_rdengine_c.tcl. 

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# -*- tcl -*-
#
# Copyright (c) 2009-2014 by Andreas Kupries <[email protected]>

# # ## ### ##### ######## ############# #####################
## Package description

## Implementation of the PackRat Machine (PARAM), a virtual machine on
## top of which parsers for Parsing Expression Grammars (PEGs) can be
## realized. This implementation is written in C, for parsers written in



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# -*- tcl -*-
#
# Copyright (c) 2009-2015 by Andreas Kupries <[email protected]>

# # ## ### ##### ######## ############# #####################
## Package description

## Implementation of the PackRat Machine (PARAM), a virtual machine on
## top of which parsers for Parsing Expression Grammars (PEGs) can be
## realized. This implementation is written in C, for parsers written in
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      return TCL_OK;
    }
}

# # ## ### ##### ######## ############# #####################
## Ready

package provide pt::rde::critcl 1.0.3
return








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      return TCL_OK;
    }
}

# # ## ### ##### ######## ############# #####################
## Ready

package provide pt::rde::critcl 1.3.3
return

Changes to modules/pt/pt_rdengine_oo.tcl. 

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# -*- tcl -*-
#
# Copyright (c) 2009-2014 by Andreas Kupries <[email protected]>

# # ## ### ##### ######## ############# #####################
## Package description

## Implementation of the PackRat Machine (PARAM), a virtual machine on
## top of which parsers for Parsing Expression Grammars (PEGs) can be
## realized. This implementation is tied to Tcl for control flow. We
## (will) have alternate implementations written in TclOO, and critcl,
## all exporting the same API.
#
## RD stands for Recursive Descent.

# # ## ### ##### ######## ############# #####################
## Requisites

package require Tcl 8.5
package require TclOO
package require struct::stack 1.4 ; # Requiring get, trim methods
package require pt::ast
package require pt::pe

# # ## ### ##### ######## ############# #####################








## Implementation

oo::class create ::pt::rde::oo {





































































    # # ## ### ##### ######## ############# #####################
    ## API - Lifecycle

    constructor {} {


	set selfns [self namespace]

	set mystackloc  [struct::stack ${selfns}::LOC]  ; # LS
	set mystackerr  [struct::stack ${selfns}::ERR]  ; # ES
	set mystackast  [struct::stack ${selfns}::AST]  ; # ARS/AS
	set mystackmark [struct::stack ${selfns}::MARK] ; # s.a.


	my reset {}
	return
    }

    method reset {chan} {


	set mychan    $chan      ; # IN
	set mycurrent {}         ; # CC
	set myloc     -1         ; # CL
	set myok      0          ; # ST
	set msvalue   {}         ; # SV
	set myerror   {}         ; # ER
	set mytoken   {}         ; # TC (string)
	array unset   mysymbol * ; # NC

	$mystackloc  clear
	$mystackerr  clear
	$mystackast  clear
	$mystackmark clear
	return
    }

    method data {string} {
	append mytoken $string
	return
    }

    method complete {} {


	if {$myok} {
	    set n [$mystackast size]

	    if {$n > 1} {

		set  pos [$mystackloc peek]
		incr pos
		set children [lreverse [$mystackast peek [$mystackast size]]]     ; # SaveToMark
		return [pt::ast new {} $pos $myloc {*}$children] ; # Reduce ALL



	    } elseif {$n == 0} {
		# Match, but no AST. This is possible if the grammar
		# consists of only the start expression.


		return {}
	    } else {

		return [$mystackast peek]


	    }
	} else {
	    lassign $myerror loc messages
	    return -code error [list pt::rde $loc $messages]


	}
    }

    # # ## ### ##### ######## ############# #####################
    ## API - State accessors

    method chan   {} { return $mychan }

    # - - -- --- ----- --------

    method current  {} { return $mycurrent }
    method location {} { return $myloc }
    method lmarked  {} { return [lreverse [$mystackloc get]] }

    # - - -- --- ----- --------

    method ok      {} { return $myok      }
    method value   {} { return $mysvalue  }
    method error   {} { return $myerror   }
    method emarked {} { return [lreverse [$mystackerr get]] }

    # - - -- --- ----- --------

    method tokens {{from {}} {to {}}} {

	switch -exact [llength [info level 0]] {
	    4 { return $mytoken }
	    5 { return [string range $mytoken $from $from] }
	    6 { return [string range $mytoken $from $to] }
	}
    }

    method symbols {} {

	return [array get mysymbol]
    }

    method scached {} {

	return [array names mysymbol]
    }

    # - - -- --- ----- --------

    method asts    {} { return [lreverse [$mystackast  get]] }


    method amarked {} { return [lreverse [$mystackmark get]] }


    method ast     {} { return [$mystackast peek] }






    # # ## ### ##### ######## ############# #####################
    ## Common instruction sequences

    method si:void_state_push {} { ;#X

	# i_loc_push
	# i_error_clear_push
	$mystackloc push $myloc
	set myerror {}
	$mystackerr push {}


	return
    }

    method si:void2_state_push {} { ;#X

	# i_loc_push
	# i_error_push
	$mystackloc push $myloc
	$mystackerr push {}


	return
    }

    method si:value_state_push {} { ;#X

	# i_ast_push
	# i_loc_push
	# i_error_clear_push
	$mystackmark push [$mystackast size]
	$mystackloc push $myloc
	set myerror {}
	$mystackerr push {}


	return
    }

    # - -- --- ----- -------- ------------- ---------------------

    method si:void_state_merge {} {

	# i_error_pop_merge
	# i_loc_pop_rewind/discard

	set olderror [$mystackerr pop]
	# We have either old or new error data, keep it.
	if {![llength $myerror]}  {
	    set myerror $olderror



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# -*- tcl -*-
#
# Copyright (c) 2009-2015 by Andreas Kupries <[email protected]>

# # ## ### ##### ######## ############# #####################
## Package description

## Implementation of the PackRat Machine (PARAM), a virtual machine on
## top of which parsers for Parsing Expression Grammars (PEGs) can be
## realized. This implementation is tied to Tcl for control flow. We
## (will) have alternate implementations written in TclOO, and critcl,
## all exporting the same API.
#
## RD stands for Recursive Descent.

# # ## ### ##### ######## ############# #####################
## Requisites

package require Tcl 8.5
package require TclOO
package require struct::stack 1.5 ; # Requiring peekr, getr, get, trim* methods
package require pt::ast
package require pt::pe

# # ## ### ##### ######## ############# #####################
## Support narrative tracing.

package require debug
debug level  pt/rdengine
debug prefix pt/rdengine {}


# # ## ### ##### ######## ############# #####################
## Implementation

oo::class create ::pt::rde::oo {
    # # ## ### ##### ######## ############# #####################
    ## Instruction counter for tracing. Unused else. Plus other helpers.

    method TraceInitialization {} {
	# Creation of the tracing support procedures.
	# Conditional on debug tag "pt/rdengine".
	# The instance namespace is the current context.
	# This is where the procedures go.

	proc Instruction {label {a {}} {b {}}} {
	    upvar 1 mytracecounter mytracecounter myok myok myloc myloc mycurrent mycurrent mysvalue mysvalue myerror myerror __inst theinst
	    set theinst [list $label $a $b]
	    return "[uplevel 1 self] <<[format %08d [incr mytracecounter]]>> START I:[format %-30s $label] [format %-10s $a] [format %-10s $b] :: [State]"
	}

	proc InstReturn {} {
	    upvar 1 mytracecounter mytracecounter myok myok myloc myloc mycurrent mycurrent mysvalue mysvalue myerror myerror __inst theinst
	    lassign $theinst label a b
	    return "[uplevel 1 self] <<[format %08d $mytracecounter]>> END__ I:[format %-30s $label] [format %-10s $a] [format %-10s $b] :: [State]"
	}

	proc State {} {
	    upvar 1 myok myok myloc myloc mycurrent mycurrent mysvalue mysvalue myerror myerror
	    set sv [expr {[info exists mysvalue] ? $mysvalue : ""}]
	    return "ST $myok CL $myloc CC ($mycurrent) SV ($sv) ER ($myerror)"
	}

	proc TraceSetupStacks {} {
	    set selfns [namespace current]

	    # Move stack instances aside.
	    rename ${selfns}::LOC   ${selfns}::LOC__
	    rename ${selfns}::ERR   ${selfns}::ERR__
	    rename ${selfns}::AST   ${selfns}::AST__
	    rename ${selfns}::MARK  ${selfns}::MRK__

	    # Create procedures doing tracing, and forwarding to
	    # the renamed actual instances.

	    interp alias {} ${selfns}::LOC  {} ${selfns}::WRAP LS  LOC__
	    interp alias {} ${selfns}::ERR  {} ${selfns}::WRAP ES  ERR__
	    interp alias {} ${selfns}::AST  {} ${selfns}::WRAP ARS AST__
	    interp alias {} ${selfns}::MARK {} ${selfns}::WRAP ASM MRK__

	    proc WRAP {label stack args} {
		debug.pt/rdengine {    $label ___ $args}
		set res [$stack {*}$args]

		# Show state state after the op
		set n [$stack size]
		if {!$n} {
		    set c {()}
		} elseif {$n == 1} {
		    set c <<[$stack peek $n]>>
		} else {
		    set c <<[join [$stack peek $n] {>> <<}]>>
		}
		debug.pt/rdengine {    $label ==  ($n):$c}

		# And op return
		debug.pt/rdengine {    $label ==> ($res)}
		return $res
	    }
	    return
	}

	return
    }

    # # ## ### ##### ######## ############# #####################
    ## API - Lifecycle

    constructor {} {
	debug.pt/rdengine {[my TraceInitialization][self] constructor}

	#set selfns [self namespace]

	set mystackloc  [struct::stack LOC]  ; # LS
	set mystackerr  [struct::stack ERR]  ; # ES
	set mystackast  [struct::stack AST]  ; # ARS/AS
	set mystackmark [struct::stack MARK] ; # s.a.

	debug.pt/rdengine {[TraceSetupStacks][self] constructor /done}
	my reset {}
	return
    }

    method reset {chan} {
	debug.pt/rdengine {[self] reset ($chan)}

	set mychan    $chan      ; # IN
	set mycurrent {}         ; # CC
	set myloc     -1         ; # CL
	set myok      0          ; # ST
	set msvalue   {}         ; # SV
	set myerror   {}         ; # ER
	set mytoken   {}         ; # TC (string)
	array unset   mysymbol * ; # NC

	$mystackloc  clear
	$mystackerr  clear
	$mystackast  clear
	$mystackmark clear


	debug.pt/rdengine {[self] reset /done}


	return
    }

    method complete {} {
	debug.pt/rdengine {[self] complete [State]}

	if {$myok} {
	    set n [$mystackast size]
	    debug.pt/rdengine {[self] complete ast $n}
	    if {$n > 1} {
		# Multiple ASTs left, reduce into single containing them.
		set  pos [$mystackloc peek]
		incr pos
		set children [$mystackast peekr [$mystackast size]]     ; # SaveToMark
		set ast [pt::ast new {} $pos $myloc {*}$children] ; # Reduce ALL

		debug.pt/rdengine {[self] complete n ==> ($ast)}
		return $ast
	    } elseif {$n == 0} {
		# Match, but no AST. This is possible if the grammar
		# consists of only the start expression.

		debug.pt/rdengine {[self] complete 0 ==> ()}
		return {}
	    } else {
		# Match, with AST.
		set ast [$mystackast peek]
		debug.pt/rdengine {[self] complete 1 ==> ($ast)}
		return $ast
	    }
	} else {
	    lassign $myerror loc messages
	    return -code error \
		-errorcode {PT RDE SYNTAX} \
		[list pt::rde $loc $messages]
	}
    }

    # # ## ### ##### ######## ############# #####################
    ## API - State accessors

    method chan   {} { debug.pt/rdengine {[self] chan} ; return $mychan }

    # - - -- --- ----- --------

    method current  {} { debug.pt/rdengine {[self] current}  ; return $mycurrent }
    method location {} { debug.pt/rdengine {[self] location} ; return $myloc }
    method lmarked  {} { debug.pt/rdengine {[self] lmarked}  ; return [$mystackloc getr] }

    # - - -- --- ----- --------

    method ok      {} { debug.pt/rdengine {[self] ok}      ; return $myok      }
    method value   {} { debug.pt/rdengine {[self] value}   ; return $mysvalue  }
    method error   {} { debug.pt/rdengine {[self] error}   ; return $myerror   }
    method emarked {} { debug.pt/rdengine {[self] emarked} ; return [$mystackerr getr] }

    # - - -- --- ----- --------

    method tokens {{from {}} {to {}}} {
	debug.pt/rdengine {[self] tokens ($from) ($to)}
	switch -exact [llength [info level 0]] {
	    4 { return $mytoken }
	    5 { return [string range $mytoken $from $from] }
	    6 { return [string range $mytoken $from $to] }
	}
    }

    method symbols {} {
	debug.pt/rdengine {[self] symbols}
	return [array get mysymbol]
    }

    method scached {} {
	debug.pt/rdengine {[self] scached}
	return [array names mysymbol]
    }

    # - - -- --- ----- --------

    method asts    {} { debug.pt/rdengine {[self] asts}    ; return [$mystackast  getr] }
    method amarked {} { debug.pt/rdengine {[self] amarked} ; return [$mystackmark getr] }
    method ast     {} { debug.pt/rdengine {[self] ast}     ; return [$mystackast  peek] }

    # # ## ### ##### ######## ############# #####################
    ## API - Preloading the token cache.

    method data {string} {
	debug.pt/rdengine {[self] data +[string length $string]}
	append mytoken $string
	return
    }

    # # ## ### ##### ######## ############# #####################
    ## Common instruction sequences

    method si:void_state_push {} {
	debug.pt/rdengine {[Instruction si:void_state_push]}
	# i_loc_push
	# i_error_clear_push
	$mystackloc push $myloc
	set myerror {}
	$mystackerr push {}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:void2_state_push {} {
	debug.pt/rdengine {[Instruction si:void2_state_push]}
	# i_loc_push
	# i_error_push
	$mystackloc push $myloc
	$mystackerr push {}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:value_state_push {} {
	debug.pt/rdengine {[Instruction si:value_state_push]}
	# i_ast_push
	# i_loc_push
	# i_error_clear_push
	$mystackmark push [$mystackast size]
	$mystackloc push $myloc
	set myerror {}
	$mystackerr push {}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    # - -- --- ----- -------- ------------- ---------------------

    method si:void_state_merge {} {
	debug.pt/rdengine {[Instruction si:void_state_merge]}
	# i_error_pop_merge
	# i_loc_pop_rewind/discard

	set olderror [$mystackerr pop]
	# We have either old or new error data, keep it.
	if {![llength $myerror]}  {
	    set myerror $olderror
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	    } elseif {$loe == $lon} {
		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}

	set last [$mystackloc pop]
	if {$myok} return
	set myloc $last


	return
    }

    method si:void_state_merge_ok {} {

	# i_error_pop_merge
	# i_loc_pop_rewind/discard
	# i_status_ok

	set olderror [$mystackerr pop]
	# We have either old or new error data, keep it.
	if {![llength $myerror]}  {








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	    } elseif {$loe == $lon} {
		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}

	set last [$mystackloc pop]
	if {!$myok} {
	    set myloc $last
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:void_state_merge_ok {} {
	debug.pt/rdengine {[Instruction si:void_state_merge_ok]}
	# i_error_pop_merge
	# i_loc_pop_rewind/discard
	# i_status_ok

	set olderror [$mystackerr pop]
	# We have either old or new error data, keep it.
	if {![llength $myerror]}  {
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	    } elseif {$loe == $lon} {
		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}

	set last [$mystackloc pop]
	if {$myok} return
	set myloc $last
	set myok 1



	return
    }

    method si:value_state_merge {} {

	# i_error_pop_merge
	# i_ast_pop_rewind/discard
	# i_loc_pop_rewind/discard

	set olderror [$mystackerr pop]
	# We have either old or new error data, keep it.
	if {![llength $myerror]}  {








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	    } elseif {$loe == $lon} {
		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}

	set last [$mystackloc pop]
	if {!$myok} {
	    set myloc $last
	    set myok 1
	}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:value_state_merge {} {
	debug.pt/rdengine {[Instruction si:value_state_merge]}
	# i_error_pop_merge
	# i_ast_pop_rewind/discard
	# i_loc_pop_rewind/discard

	set olderror [$mystackerr pop]
	# We have either old or new error data, keep it.
	if {![llength $myerror]}  {
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		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}

	set mark [$mystackmark pop]
	set last [$mystackloc pop]
	if {$myok} return
	$mystackast trim* $mark
	set myloc $last



	return
    }

    # - -- --- ----- -------- ------------- ---------------------

    method si:value_notahead_start {} {

	# i_loc_push
	# i_ast_push

	$mystackloc  push $myloc
	$mystackmark push [$mystackast size]


	return
    }

    method si:void_notahead_exit {} {

	# i_loc_pop_rewind
	# i_status_negate

	set myloc [$mystackloc pop]
	set myok [expr {!$myok}]


	return
    }

    method si:value_notahead_exit {} {

	# i_ast_pop_discard/rewind
	# i_loc_pop_rewind
	# i_status_negate

	set mark [$mystackmark pop]
	if {$myok} {
	    $mystackast trim* $mark
	}
	set myloc [$mystackloc pop]
	set myok [expr {!$myok}]


	return
    }

    # - -- --- ----- -------- ------------- ---------------------

    method si:kleene_abort {} {

	# i_loc_pop_rewind/discard
	# i:fail_return

	set last [$mystackloc pop]
	if {$myok} return



	set myloc $last

	return -code return
    }

    method si:kleene_close {} {

	# i_error_pop_merge
	# i_loc_pop_rewind/discard
	# i:fail_status_ok
	# i:fail_return

	set olderror [$mystackerr pop]
	# We have either old or new error data, keep it.








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		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}

	set mark [$mystackmark pop]
	set last [$mystackloc pop]
	if {!$myok} {
	    $mystackast trim* $mark
	    set myloc $last
	}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    # - -- --- ----- -------- ------------- ---------------------

    method si:value_notahead_start {} {
	debug.pt/rdengine {[Instruction si:value_notahead_start]}
	# i_loc_push
	# i_ast_push

	$mystackloc  push $myloc
	$mystackmark push [$mystackast size]

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:void_notahead_exit {} {
	debug.pt/rdengine {[Instruction si:void_notahead_exit]}
	# i_loc_pop_rewind
	# i_status_negate

	set myloc [$mystackloc pop]
	set myok [expr {!$myok}]

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:value_notahead_exit {} {
	debug.pt/rdengine {[Instruction si:value_notahead_exit]}
	# i_ast_pop_discard/rewind
	# i_loc_pop_rewind
	# i_status_negate

	set mark [$mystackmark pop]
	if {$myok} {
	    $mystackast trim* $mark
	}
	set myloc [$mystackloc pop]
	set myok [expr {!$myok}]

	debug.pt/rdengine {[InstReturn]}
	return
    }

    # - -- --- ----- -------- ------------- ---------------------

    method si:kleene_abort {} {
	debug.pt/rdengine {[Instruction si:kleene_abort]}
	# i_loc_pop_rewind/discard
	# i:fail_return

	set last [$mystackloc pop]
	if {$myok} {
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set myloc $last
	debug.pt/rdengine {[InstReturn]}
	return -code return
    }

    method si:kleene_close {} {
	debug.pt/rdengine {[Instruction si:kleene_close]}
	# i_error_pop_merge
	# i_loc_pop_rewind/discard
	# i:fail_status_ok
	# i:fail_return

	set olderror [$mystackerr pop]
	# We have either old or new error data, keep it.
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	    } elseif {$loe == $lon} {
		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}

	set last [$mystackloc pop]
	if {$myok} return



	set myok 1
	set myloc $last


	return -code return
    }

    # - -- --- ----- -------- ------------- ---------------------

    method si:voidvoid_branch {} {

	# i_error_pop_merge
	# i:ok_loc_pop_discard
	# i:ok_return
	# i_loc_rewind
	# i_error_push

	set olderror [$mystackerr pop]








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	    } elseif {$loe == $lon} {
		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}

	set last [$mystackloc pop]
	if {$myok} {
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set myok 1
	set myloc $last

	debug.pt/rdengine {[InstReturn]}
	return -code return
    }

    # - -- --- ----- -------- ------------- ---------------------

    method si:voidvoid_branch {} {
	debug.pt/rdengine {[Instruction si:voidvoid_branch]}
	# i_error_pop_merge
	# i:ok_loc_pop_discard
	# i:ok_return
	# i_loc_rewind
	# i_error_push

	set olderror [$mystackerr pop]
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		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}

	if {$myok} {
	    $mystackloc pop

	    return -code return
	}
	set myloc [$mystackloc peek]
	$mystackerr push $myerror


	return
    }

    method si:voidvalue_branch {} {

	# i_error_pop_merge
	# i:ok_loc_pop_discard
	# i:ok_return
	# i_ast_push
	# i_loc_rewind
	# i_error_push









>




>
>




>








501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526

		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}

	if {$myok} {
	    $mystackloc pop
	    debug.pt/rdengine {[InstReturn]}
	    return -code return
	}
	set myloc [$mystackloc peek]
	$mystackerr push $myerror

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:voidvalue_branch {} {
	debug.pt/rdengine {[Instruction si:voidvalue_branch]}
	# i_error_pop_merge
	# i:ok_loc_pop_discard
	# i:ok_return
	# i_ast_push
	# i_loc_rewind
	# i_error_push
︙︙
392
393
394
395
396
397
398

399
400
401
402
403


404
405
406
407

408
409
410
411
412
413
414

		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}

	if {$myok} {
	    $mystackloc pop

	    return -code return
	}
	$mystackmark push [$mystackast size]
	set myloc [$mystackloc peek]
	$mystackerr push {}


	return
    }

    method si:valuevoid_branch {} {

	# i_error_pop_merge
	# i_ast_pop_rewind/discard
	# i:ok_loc_pop_discard
	# i:ok_return
	# i_loc_rewind
	# i_error_push









>





>
>




>








541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567

		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}

	if {$myok} {
	    $mystackloc pop
	    debug.pt/rdengine {[InstReturn]}
	    return -code return
	}
	$mystackmark push [$mystackast size]
	set myloc [$mystackloc peek]
	$mystackerr push {}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:valuevoid_branch {} {
	debug.pt/rdengine {[Instruction si:valuevoid_branch]}
	# i_error_pop_merge
	# i_ast_pop_rewind/discard
	# i:ok_loc_pop_discard
	# i:ok_return
	# i_loc_rewind
	# i_error_push
︙︙
429
430
431
432
433
434
435

436
437
438
439
440


441
442
443
444

445
446
447
448
449
450
451

		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}
	set mark [$mystackmark pop]
	if {$myok} {
	    $mystackloc pop

	    return -code return
	}
	$mystackast trim* $mark
	set myloc [$mystackloc peek]
	$mystackerr push {}


	return
    }

    method si:valuevalue_branch {} {

	# i_error_pop_merge
	# i_ast_pop_discard
	# i:ok_loc_pop_discard
	# i:ok_return
	# i_ast_rewind
	# i_loc_rewind
	# i_error_push








>





>
>




>








582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608

		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}
	set mark [$mystackmark pop]
	if {$myok} {
	    $mystackloc pop
	    debug.pt/rdengine {[InstReturn]}
	    return -code return
	}
	$mystackast trim* $mark
	set myloc [$mystackloc peek]
	$mystackerr push {}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:valuevalue_branch {} {
	debug.pt/rdengine {[Instruction si:valuevalue_branch]}
	# i_error_pop_merge
	# i_ast_pop_discard
	# i:ok_loc_pop_discard
	# i:ok_return
	# i_ast_rewind
	# i_loc_rewind
	# i_error_push
︙︙
467
468
469
470
471
472
473


474
475
476
477
478


479
480
481
482
483
484

485
486
487
488
489
490
491

		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}
	if {$myok} {
	    $mystackmark pop
	    $mystackloc pop


	    return -code return
	}
	$mystackast trim* [$mystackmark peek]
	set myloc [$mystackloc peek]
	$mystackerr push {}


	return
    }

    # - -- --- ----- -------- ------------- ---------------------

    method si:voidvoid_part {} {

	# i_error_pop_merge
	# i:fail_loc_pop_rewind
	# i:fail_return
	# i_error_push

	set olderror [$mystackerr pop]
	# We have either old or new error data, keep it.








>
>





>
>






>








624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653

		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}
	if {$myok} {
	    $mystackmark pop
	    $mystackloc pop

	    debug.pt/rdengine {[InstReturn]}
	    return -code return
	}
	$mystackast trim* [$mystackmark peek]
	set myloc [$mystackloc peek]
	$mystackerr push {}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    # - -- --- ----- -------- ------------- ---------------------

    method si:voidvoid_part {} {
	debug.pt/rdengine {[Instruction si:voidvoid_part]}
	# i_error_pop_merge
	# i:fail_loc_pop_rewind
	# i:fail_return
	# i_error_push

	set olderror [$mystackerr pop]
	# We have either old or new error data, keep it.
︙︙
503
504
505
506
507
508
509

510
511
512


513
514
515
516

517
518
519
520
521
522
523

	    } elseif {$loe == $lon} {
		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}
	if {!$myok} {
	    set myloc [$mystackloc pop]

	    return -code return
	}
	$mystackerr push $myerror


	return
    }

    method si:voidvalue_part {} {

	# i_error_pop_merge
	# i:fail_loc_pop_rewind
	# i:fail_return
	# i_ast_push
	# i_error_push

	set olderror [$mystackerr pop]








>



>
>




>








665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689

	    } elseif {$loe == $lon} {
		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}
	if {!$myok} {
	    set myloc [$mystackloc pop]
	    debug.pt/rdengine {[InstReturn]}
	    return -code return
	}
	$mystackerr push $myerror

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:voidvalue_part {} {
	debug.pt/rdengine {[Instruction si:voidvalue_part]}
	# i_error_pop_merge
	# i:fail_loc_pop_rewind
	# i:fail_return
	# i_ast_push
	# i_error_push

	set olderror [$mystackerr pop]
︙︙
536
537
538
539
540
541
542

543
544
545
546


547
548
549
550

551
552
553
554
555
556
557

	    } elseif {$loe == $lon} {
		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}
	if {!$myok} {
	    set myloc [$mystackloc pop]

	    return -code return
	}
	$mystackmark push [$mystackast size]
	$mystackerr push $myerror


	return
    }

    method si:valuevalue_part {} {

	# i_error_pop_merge
	# i:fail_ast_pop_rewind
	# i:fail_loc_pop_rewind
	# i:fail_return
	# i_error_push

	set olderror [$mystackerr pop]








>




>
>




>








702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727

	    } elseif {$loe == $lon} {
		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}
	if {!$myok} {
	    set myloc [$mystackloc pop]
	    debug.pt/rdengine {[InstReturn]}
	    return -code return
	}
	$mystackmark push [$mystackast size]
	$mystackerr push $myerror

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:valuevalue_part {} {
	debug.pt/rdengine {[Instruction si:valuevalue_part]}
	# i_error_pop_merge
	# i:fail_ast_pop_rewind
	# i:fail_loc_pop_rewind
	# i:fail_return
	# i_error_push

	set olderror [$mystackerr pop]
︙︙
571
572
573
574
575
576
577


578
579
580


581
582
583
584
585
586

587
588
589
590
591
592
593
594
595
596
597
598

599
600
601
602








603
604
605
606
607
608
609
610
611
612

613
614
615
616

617
618
619
620
621
622
623
624
625
626
627

628
629
630
631
632
633
634
635
636
637
638
639
640
641
642

643
644
645
646

647
648
649
650
651
652
653
654
655

656
657
658
659
660
661
662
663
664
665
666

667
668
669
670

671
672
673
674
675
676
677
678
679

680
681
682
683
684
685
686
687
688
689
690
691
692
693

694
695
696
697
698
699

700
701
702
703
704
705
706
707
708

709
710
711
712
713
714
715
716
717
718
719

720
721
722
723

724
725
726
727
728
729
730
731
732

733
734
735
736
737
738
739
740
741
742
743

744
745
746
747

748
749
750
751
752
753
754
755
756

757
758
759
760
761
762
763
764
765
766
767

768
769
770
771

772
773
774
775
776
777
778
779
780

781
782
783
784
785
786
787
788
789
790
791

792
793
794
795

796
797
798
799
800
801
802
803
804

805
806
807
808
809
810
811
812
813
814
815

816
817
818
819

820
821
822
823
824
825
826
827
828

829
830
831
832
833
834
835
836
837
838
839

840
841
842
843

844
845
846
847
848
849
850
851
852

853
854
855
856
857
858
859
860
861
862
863

864
865
866
867

868
869
870
871
872
873
874
875
876

877
878
879
880
881
882
883
884
885
886
887

888
889
890
891

892
893
894
895
896
897
898
899
900

901
902
903
904
905
906
907
908
909
910
911

912
913
914
915

916
917
918
919
920
921
922
923
924

925
926
927
928
929
930
931
932
933
934
935

936
937
938
939

940
941
942
943
944
945
946
947
948

949
950
951
952
953
954
955
956
957
958
959

960
961
962
963

964
965
966
967
968
969
970
971
972

973
974
975
976
977
978
979
980
981
982
983

984
985
986
987

988
989
990
991
992
993
994
995
996

997
998
999
1000
1001
1002
1003
1004
1005
1006
1007

1008
1009
1010
1011

1012
1013
1014
1015
1016
1017
1018
1019
1020

1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031

1032
1033
1034
1035
1036
1037

1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049

1050
1051
1052
1053


1054
1055
1056
1057

1058
1059
1060
1061
1062
1063
1064
1065

1066
1067
1068
1069


1070
1071
1072
1073

1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084

1085
1086
1087


1088
1089
1090
1091

1092
1093
1094
1095
1096
1097
1098

1099
1100
1101


1102
1103
1104
1105

1106
1107
1108
1109
1110
1111
1112

		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}
	if {!$myok} {
	    $mystackast trim* [$mystackmark pop]
	    set myloc [$mystackloc pop]


	    return -code return
	}
	$mystackerr push $myerror


	return
    }

    # - -- --- ----- -------- ------------- ---------------------

    method si:next_str {tok} {

	# String = sequence of characters. No need for all the intermediate
	# stack churn.

	set n    [string length $tok]
	set last [expr {$myloc + $n}]
	set max  [string length $mytoken]

	incr myloc
	if {($last >= $max) && ![my ExtendTCN [expr {$last - $max + 1}]]} {
	    set myok    0
	    set myerror [list $myloc [list [list str $tok]]]
	    # i:fail_return

	    return
	}
	set lex       [string range $mytoken $myloc $last]
	set mycurrent [string index $mytoken $last]









	set myok [expr {$tok eq $lex}]

	if {$myok} {
	    set myloc $last
	    set myerror {}
	} else {
	    set myerror [list $myloc [list [list str $tok]]]
	    incr myloc -1
	}

	return
    }

    method si:next_class {tok} {

	# Class = Choice of characters. No need for stack churn.

	# i_input_next "\{t $c\}"
	# i:fail_return
	# i_test_<user class>

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list [list cl $tok]]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	# Note what is needle versus hay. The token, i.e. the string
	# of allowed characters is the hay in which the current
	# character is looked, making it the needle.
	set myok [expr {[string first $mycurrent $tok] >= 0}]

	if {$myok} {
	    set myerror {}
	} else {
	    set myerror [list $myloc [list [list cl $tok]]]
	    incr myloc -1
	}

	return
    }

    method si:next_char {tok} {

	# i_input_next "\{t $c\}"
	# i:fail_return
	# i_test_char $c

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list [list t $tok]]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [expr {$tok eq $mycurrent}]
	if {$myok} {
	    set myerror {}
	} else {
	    set myerror [list $myloc [list [list t $tok]]]
	    incr myloc -1
	}

	return
    }

    method si:next_range {toks toke} {

	#Asm::Ins i_input_next "\{.. $s $e\}"
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_range $s $e

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list [list .. $toks $toke]]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [expr {
			([string compare $toks $mycurrent] <= 0) &&
			([string compare $mycurrent $toke] <= 0)
		    }] ; # {}
	if {$myok} {
	    set myerror {}
	} else {
	    set myerror [list $myloc [list [pt::pe range $toks $toke]]]
	    incr myloc -1
	}

	return
    }

    # - -- --- ----- -------- ------------- ---------------------

    method si:next_alnum {} { ; #TRACE puts "[format %8d [incr count]] RDE si:next_alnum"

	#Asm::Ins i_input_next alnum
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_alnum

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list alnum]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is alnum -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list alnum]]
	    incr myloc -1
	} else {
	    set myerror {}
	}

	return
    }

    method si:next_alpha {} { ; #TRACE puts "[format %8d [incr count]] RDE si:next_alpha"

	#Asm::Ins i_input_next alpha
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_alpha

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list alpha]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is alpha -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list alpha]]
	    incr myloc -1
	} else {
	    set myerror {}
	}

	return
    }

    method si:next_ascii {} { ; #TRACE puts "[format %8d [incr count]] RDE si:next_ascii"

	#Asm::Ins i_input_next ascii
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_ascii

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list ascii]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is ascii -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list ascii]]
	    incr myloc -1
	} else {
	    set myerror {}
	}

	return
    }

    method si:next_control {} { ; #TRACE puts "[format %8d [incr count]] RDE si:next_control"

	#Asm::Ins i_input_next control
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_control

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list control]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is control -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list control]]
	    incr myloc -1
	} else {
	    set myerror {}
	}

	return
    }

    method si:next_ddigit {} { ; #TRACE puts "[format %8d [incr count]] RDE si:next_ddigit"

	#Asm::Ins i_input_next ddigit
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_ddigit

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list ddigit]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string match {[0-9]} $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list ddigit]]
	    incr myloc -1
	} else {
	    set myerror {}
	}

	return
    }

    method si:next_digit {} { ; #TRACE puts "[format %8d [incr count]] RDE si:next_digit"

	#Asm::Ins i_input_next digit
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_digit

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list digit]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is digit -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list digit]]
	    incr myloc -1
	} else {
	    set myerror {}
	}

	return
    }

    method si:next_graph {} { ; #TRACE puts "[format %8d [incr count]] RDE si:next_graph"

	#Asm::Ins i_input_next graph
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_graph

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list graph]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is graph -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list graph]]
	    incr myloc -1
	} else {
	    set myerror {}
	}

	return
    }

    method si:next_lower {} { ; #TRACE puts "[format %8d [incr count]] RDE si:next_lower"

	#Asm::Ins i_input_next lower
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_lower

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list lower]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is lower -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list lower]]
	    incr myloc -1
	} else {
	    set myerror {}
	}

	return
    }

    method si:next_print {} { ; #TRACE puts "[format %8d [incr count]] RDE si:next_print"

	#Asm::Ins i_input_next print
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_print

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list print]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is print -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list print]]
	    incr myloc -1
	} else {
	    set myerror {}
	}

	return
    }

    method si:next_punct {} { ; #TRACE puts "[format %8d [incr count]] RDE si:next_punct"

	#Asm::Ins i_input_next punct
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_punct

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list punct]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is punct -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list punct]]
	    incr myloc -1
	} else {
	    set myerror {}
	}

	return
    }

    method si:next_space {} { ; #TRACE puts "[format %8d [incr count]] RDE si:next_space"

	#Asm::Ins i_input_next space
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_space

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list space]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is space -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list space]]
	    incr myloc -1
	} else {
	    set myerror {}
	}

	return
    }

    method si:next_upper {} { ; #TRACE puts "[format %8d [incr count]] RDE si:next_upper"

	#Asm::Ins i_input_next upper
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_upper

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list upper]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is upper -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list upper]]
	    incr myloc -1
	} else {
	    set myerror {}
	}

	return
    }

    method si:next_wordchar {} { ; #TRACE puts "[format %8d [incr count]] RDE si:next_wordchar"

	#Asm::Ins i_input_next wordchar
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_wordchar

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list wordchar]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is wordchar -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list wordchar]]
	    incr myloc -1
	} else {
	    set myerror {}
	}

	return
    }

    method si:next_xdigit {} { ; #TRACE puts "[format %8d [incr count]] RDE si:next_xdigit"

	#Asm::Ins i_input_next xdigit
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_xdigit

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list xdigit]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is xdigit -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list xdigit]]
	    incr myloc -1
	} else {
	    set myerror {}
	}

	return
    }

    # - -- --- ----- -------- ------------- ---------------------

    method si:value_symbol_start {symbol} {

	# if @runtime@ i_symbol_restore $symbol
	# i:found:ok_ast_value_push
	# i:found_return
	# i_loc_push
	# i_ast_push

	set k [list $myloc $symbol]
	if {[info exists mysymbol($k)]} { 
	    lassign $mysymbol($k) myloc myok myerror mysvalue
	    if {$myok} {
		$mystackast push $mysvalue
	    }

	    return -code return
	}
	$mystackloc  push $myloc
	$mystackmark push [$mystackast size]


	return
    }

    method si:value_void_symbol_start {symbol} {

	# if @runtime@ i_symbol_restore $symbol
	# i:found_return
	# i_loc_push
	# i_ast_push

	set k [list $myloc $symbol]
	if {[info exists mysymbol($k)]} { 
	    lassign $mysymbol($k) myloc myok myerror mysvalue

	    return -code return
	}
	$mystackloc  push $myloc
	$mystackmark push [$mystackast size]


	return
    }

    method si:void_symbol_start {symbol} {

	# if @runtime@ i_symbol_restore $symbol
	# i:found:ok_ast_value_push
	# i:found_return
	# i_loc_push

	set k [list $myloc $symbol]
	if {[info exists mysymbol($k)]} { 
	    lassign $mysymbol($k) myloc myok myerror mysvalue
	    if {$myok} {
		$mystackast push $mysvalue
	    }

	    return -code return
	}
	$mystackloc push $myloc


	return
    }

    method si:void_void_symbol_start {symbol} {

	# if @runtime@ i_symbol_restore $symbol
	# i:found_return
	# i_loc_push

	set k [list $myloc $symbol]
	if {[info exists mysymbol($k)]} { 
	    lassign $mysymbol($k) myloc myok myerror mysvalue

	    return -code return
	}
	$mystackloc push $myloc


	return
    }

    method si:reduce_symbol_end {symbol} {

	# i_value_clear/reduce $symbol
	# i_symbol_save       $symbol
	# i_error_nonterminal $symbol
	# i_ast_pop_rewind
	# i_loc_pop_discard
	# i:ok_ast_value_push









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		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}
	if {!$myok} {
	    $mystackast trim* [$mystackmark pop]
	    set myloc [$mystackloc pop]

	    debug.pt/rdengine {[InstReturn]}
	    return -code return
	}
	$mystackerr push $myerror

	debug.pt/rdengine {[InstReturn]}
	return
    }

    # - -- --- ----- -------- ------------- ---------------------

    method si:next_str {tok} {
	debug.pt/rdengine {[Instruction si:next_str $tok]}
	# String = sequence of characters.
	# No need for all the intermediate stack churn.

	set n    [string length $tok]
	set last [expr {$myloc + $n}]
	set max  [string length $mytoken]

	incr myloc
	if {($last >= $max) && ![my ExtendTCN [expr {$last - $max + 1}]]} {
	    set myok    0
	    set myerror [list $myloc [list [list str $tok]]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set lex       [string range $mytoken $myloc $last]
	set mycurrent [string index $mytoken $last]

	# ATTENTION: The error output of this instruction is different
	# from a regular sequence of si:next_char instructions. The
	# error location will be the start of the string token we
	# wanted to match, and the message will contain the entire
	# string token. In the regular sequence we would see the exact
	# point of the mismatch instead, with the message containing
	# the expected character.

	set myok [expr {$tok eq $lex}]

	if {$myok} {
	    set myloc $last
	    set myerror {}
	} else {
	    set myerror [list $myloc [list [list str $tok]]]
	    incr myloc -1
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:next_class {tok} {
	debug.pt/rdengine {[Instruction si:next_class $tok]}
	# Class = Choice of characters. No need for stack churn.

	# i_input_next "\{t $c\}"
	# i:fail_return
	# i_test_<user class>

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list [list cl $tok]]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	# Note what is needle versus hay. The token, i.e. the string
	# of allowed characters is the hay in which the current
	# character is looked, making it the needle.
	set myok [expr {[string first $mycurrent $tok] >= 0}]

	if {$myok} {
	    set myerror {}
	} else {
	    set myerror [list $myloc [list [list cl $tok]]]
	    incr myloc -1
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:next_char {tok} {
	debug.pt/rdengine {[Instruction si:next_char $tok]}
	# i_input_next "\{t $c\}"
	# i:fail_return
	# i_test_char $c

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list [list t $tok]]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [expr {$tok eq $mycurrent}]
	if {$myok} {
	    set myerror {}
	} else {
	    set myerror [list $myloc [list [list t $tok]]]
	    incr myloc -1
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:next_range {toks toke} {
	debug.pt/rdengine {[Instruction si:next_range $toks $toke]}
	#Asm::Ins i_input_next "\{.. $s $e\}"
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_range $s $e

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list [list .. $toks $toke]]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [expr {
			([string compare $toks $mycurrent] <= 0) &&
			([string compare $mycurrent $toke] <= 0)
		    }] ; # {}
	if {$myok} {
	    set myerror {}
	} else {
	    set myerror [list $myloc [list [pt::pe range $toks $toke]]]
	    incr myloc -1
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    # - -- --- ----- -------- ------------- ---------------------

    method si:next_alnum {} {
	debug.pt/rdengine {[Instruction si:next_alnum]}
	#Asm::Ins i_input_next alnum
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_alnum

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list alnum]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is alnum -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list alnum]]
	    incr myloc -1
	} else {
	    set myerror {}
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:next_alpha {} {
	debug.pt/rdengine {[Instruction si:next_alpha]}
	#Asm::Ins i_input_next alpha
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_alpha

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list alpha]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is alpha -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list alpha]]
	    incr myloc -1
	} else {
	    set myerror {}
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:next_ascii {} {
	debug.pt/rdengine {[Instruction si:next_ascii]}
	#Asm::Ins i_input_next ascii
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_ascii

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list ascii]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is ascii -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list ascii]]
	    incr myloc -1
	} else {
	    set myerror {}
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:next_control {} {
	debug.pt/rdengine {[Instruction si:next_control]}
	#Asm::Ins i_input_next control
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_control

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list control]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is control -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list control]]
	    incr myloc -1
	} else {
	    set myerror {}
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:next_ddigit {} {
	debug.pt/rdengine {[Instruction si:next_ddigit]}
	#Asm::Ins i_input_next ddigit
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_ddigit

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list ddigit]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string match {[0-9]} $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list ddigit]]
	    incr myloc -1
	} else {
	    set myerror {}
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:next_digit {} {
	debug.pt/rdengine {[Instruction si:next_digit]}
	#Asm::Ins i_input_next digit
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_digit

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list digit]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is digit -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list digit]]
	    incr myloc -1
	} else {
	    set myerror {}
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:next_graph {} {
	debug.pt/rdengine {[Instruction si:next_graph]}
	#Asm::Ins i_input_next graph
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_graph

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list graph]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is graph -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list graph]]
	    incr myloc -1
	} else {
	    set myerror {}
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:next_lower {} {
	debug.pt/rdengine {[Instruction si:next_lower]}
	#Asm::Ins i_input_next lower
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_lower

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list lower]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is lower -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list lower]]
	    incr myloc -1
	} else {
	    set myerror {}
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:next_print {} {
	debug.pt/rdengine {[Instruction si:next_print]}
	#Asm::Ins i_input_next print
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_print

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list print]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is print -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list print]]
	    incr myloc -1
	} else {
	    set myerror {}
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:next_punct {} {
	debug.pt/rdengine {[Instruction si:next_punct]}
	#Asm::Ins i_input_next punct
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_punct

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list punct]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is punct -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list punct]]
	    incr myloc -1
	} else {
	    set myerror {}
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:next_space {} {
	debug.pt/rdengine {[Instruction si:next_space]}
	#Asm::Ins i_input_next space
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_space

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list space]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is space -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list space]]
	    incr myloc -1
	} else {
	    set myerror {}
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:next_upper {} {
	debug.pt/rdengine {[Instruction si:next_upper]}
	#Asm::Ins i_input_next upper
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_upper

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list upper]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is upper -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list upper]]
	    incr myloc -1
	} else {
	    set myerror {}
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:next_wordchar {} {
	debug.pt/rdengine {[Instruction si:next_wordchar]}
	#Asm::Ins i_input_next wordchar
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_wordchar

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list wordchar]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is wordchar -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list wordchar]]
	    incr myloc -1
	} else {
	    set myerror {}
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:next_xdigit {} {
	debug.pt/rdengine {[Instruction si:next_xdigit]}
	#Asm::Ins i_input_next xdigit
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_xdigit

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list xdigit]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is xdigit -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list xdigit]]
	    incr myloc -1
	} else {
	    set myerror {}
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    # - -- --- ----- -------- ------------- ---------------------

    method si:value_symbol_start {symbol} {
	debug.pt/rdengine {[Instruction si:value_symbol_start $symbol]}
	# if @runtime@ i_symbol_restore $symbol
	# i:found:ok_ast_value_push
	# i:found_return
	# i_loc_push
	# i_ast_push

	set k [list $myloc $symbol]
	if {[info exists mysymbol($k)]} { 
	    lassign $mysymbol($k) myloc myok myerror mysvalue
	    if {$myok} {
		$mystackast push $mysvalue
	    }
	    debug.pt/rdengine {[InstReturn]}
	    return -code return
	}
	$mystackloc  push $myloc
	$mystackmark push [$mystackast size]

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:value_void_symbol_start {symbol} {
	debug.pt/rdengine {[Instruction si:value_void_symbol_start $symbol]}
	# if @runtime@ i_symbol_restore $symbol
	# i:found_return
	# i_loc_push
	# i_ast_push

	set k [list $myloc $symbol]
	if {[info exists mysymbol($k)]} { 
	    lassign $mysymbol($k) myloc myok myerror mysvalue
	    debug.pt/rdengine {[InstReturn]}
	    return -code return
	}
	$mystackloc  push $myloc
	$mystackmark push [$mystackast size]

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:void_symbol_start {symbol} {
	debug.pt/rdengine {[Instruction si:void_symbol_start $symbol]}
	# if @runtime@ i_symbol_restore $symbol
	# i:found:ok_ast_value_push
	# i:found_return
	# i_loc_push

	set k [list $myloc $symbol]
	if {[info exists mysymbol($k)]} { 
	    lassign $mysymbol($k) myloc myok myerror mysvalue
	    if {$myok} {
		$mystackast push $mysvalue
	    }
	    debug.pt/rdengine {[InstReturn]}
	    return -code return
	}
	$mystackloc push $myloc

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:void_void_symbol_start {symbol} {
	debug.pt/rdengine {[Instruction si:void_void_symbol_start $symbol]}
	# if @runtime@ i_symbol_restore $symbol
	# i:found_return
	# i_loc_push

	set k [list $myloc $symbol]
	if {[info exists mysymbol($k)]} { 
	    lassign $mysymbol($k) myloc myok myerror mysvalue
	    debug.pt/rdengine {[InstReturn]}
	    return -code return
	}
	$mystackloc push $myloc

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:reduce_symbol_end {symbol} {
	debug.pt/rdengine {[Instruction si:reduce_symbol_end $symbol]}
	# i_value_clear/reduce $symbol
	# i_symbol_save       $symbol
	# i_error_nonterminal $symbol
	# i_ast_pop_rewind
	# i_loc_pop_discard
	# i:ok_ast_value_push
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	    }
	}}

	$mystackast trim* [$mystackmark pop]
	if {$myok} {
	    $mystackast push $mysvalue
	}

	return
    }

    method si:void_leaf_symbol_end {symbol} {

	# i_value_clear/leaf $symbol
	# i_symbol_save       $symbol
	# i_error_nonterminal $symbol
	# i_loc_pop_discard
	# i:ok_ast_value_push

	set mysvalue {}








>




>








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	    }
	}}

	$mystackast trim* [$mystackmark pop]
	if {$myok} {
	    $mystackast push $mysvalue
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:void_leaf_symbol_end {symbol} {
	debug.pt/rdengine {[Instruction si:void_leaf_symbol_end $symbol]}
	# i_value_clear/leaf $symbol
	# i_symbol_save       $symbol
	# i_error_nonterminal $symbol
	# i_loc_pop_discard
	# i:ok_ast_value_push

	set mysvalue {}
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		set myerror [list $loc [list [list n $symbol]]]
	    }
	}}

	if {$myok} {
	    $mystackast push $mysvalue
	}


	return
    }

    method si:value_leaf_symbol_end {symbol} {

	# i_value_clear/leaf $symbol
	# i_symbol_save       $symbol
	# i_error_nonterminal $symbol
	# i_loc_pop_discard
	# i_ast_pop_rewind
	# i:ok_ast_value_push









>
>




>








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		set myerror [list $loc [list [list n $symbol]]]
	    }
	}}

	if {$myok} {
	    $mystackast push $mysvalue
	}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:value_leaf_symbol_end {symbol} {
	debug.pt/rdengine {[Instruction si:value_leaf_symbol_end $symbol]}
	# i_value_clear/leaf $symbol
	# i_symbol_save       $symbol
	# i_error_nonterminal $symbol
	# i_loc_pop_discard
	# i_ast_pop_rewind
	# i:ok_ast_value_push
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	    }
	}}

	$mystackast trim* [$mystackmark pop]
	if {$myok} {
	    $mystackast push $mysvalue
	}


	return
    }

    method si:value_clear_symbol_end {symbol} {

	# i_value_clear
	# i_symbol_save       $symbol
	# i_error_nonterminal $symbol
	# i_loc_pop_discard
	# i_ast_pop_rewind

	set mysvalue {}








>
>




>








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	    }
	}}

	$mystackast trim* [$mystackmark pop]
	if {$myok} {
	    $mystackast push $mysvalue
	}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:value_clear_symbol_end {symbol} {
	debug.pt/rdengine {[Instruction si:value_clear_symbol_end $symbol]}
	# i_value_clear
	# i_symbol_save       $symbol
	# i_error_nonterminal $symbol
	# i_loc_pop_discard
	# i_ast_pop_rewind

	set mysvalue {}
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	    lassign $myerror loc messages
	    if {$loc == $pos} {
		set myerror [list $loc [list [list n $symbol]]]
	    }
	}}

	$mystackast trim* [$mystackmark pop]

	return
    }

    method si:void_clear_symbol_end {symbol} {

	# i_value_clear
	# i_symbol_save       $symbol
	# i_error_nonterminal $symbol
	# i_loc_pop_discard

	set mysvalue {}
	set at [$mystackloc pop]

	set k  [list $at $symbol]
	set mysymbol($k) [list $myloc $myok $myerror $mysvalue]

	# si:void_clear_symbol_end / i_error_nonterminal -- inlined -- disabled
	if {0} {if {[llength $myerror]} {
	    set  pos $at
	    incr pos
	    lassign $myerror loc messages
	    if {$loc == $pos} {
		set myerror [list $loc [list [list n $symbol]]]
	    }
	}}

	return
    }

    # # ## ### ##### ######## ############# #####################
    ## API - Instructions - Control flow

    method i:ok_continue {} {

	if {!$myok} return
	return -code continue
    }

    method i:fail_continue {} {

	if {$myok} return
	return -code continue
    }

    method i:fail_return {} {

	if {$myok} return
	return -code return
    }

    method i:ok_return {} {

	if {!$myok} return
	return -code return
    }

    # # ## ### ##### ######## ############# #####################
    ##  API - Instructions - Unconditional matching.

    method i_status_ok {} {

	set myok 1

	return
    }

    method i_status_fail {} {

	set myok 0

	return
    }

    method i_status_negate {} {

	set myok [expr {!$myok}]

	return
    }

    # # ## ### ##### ######## ############# #####################
    ##  API - Instructions - Error handling.

    method i_error_clear {} {

	set myerror {}

	return
    }

    method i_error_push {} {

	$mystackerr push $myerror

	return
    }

    method i_error_clear_push {} {

	set myerror {}
	$mystackerr push {}

	return
    }

    method i_error_pop_merge {} {

	set olderror [$mystackerr pop]

	# We have either old or new error data, keep it.

	if {![llength $myerror]}  { set myerror $olderror ; return }
	if {![llength $olderror]} return

	# If one of the errors is further on in the input choose that as
	# the information to propagate.

	lassign $myerror  loe msgse
	lassign $olderror lon msgsn

	if {$lon > $loe} { set myerror $olderror ; return }
	if {$loe > $lon} return

	# Equal locations, merge the message lists.
	#set myerror [list $loe [struct::set union $msgse $msgsn]]
	set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]

	return
    }

    method i_error_nonterminal {symbol} {

	#  i_error_nonterminal -- Disabled. Generate only low-level
	#  i_error_nonterminal -- errors until we have worked out how
	#  i_error_nonterminal -- to integrate symbol information with
	#  i_error_nonterminal -- them. Do not forget where this
	#  i_error_nonterminal -- instruction is inlined.
	return

	# Inlined: Errors, Expected.
	if {![llength $myerror]} return



	set pos [$mystackloc peek]
	incr pos
	lassign $myerror loc messages
	if {$loc != $pos} return



	set myerror [list $loc [list $symbol]]


	return
    }

    # # ## ### ##### ######## ############# #####################
    ##  API - Instructions - Basic input handling and tracking

    method i_loc_pop_rewind/discard {} {

	#$myparser i:fail_loc_pop_rewind
	#$myparser i:ok_loc_pop_discard
	#return
	set last [$mystackloc pop]
	if {!$myok} {
	    set myloc $last
	}

	return
    }

    method i_loc_pop_discard {} {

	$mystackloc pop

	return
    }



    method i_loc_pop_rewind {} {

	set myloc [$mystackloc pop]

	return
    }

    method i:fail_loc_pop_rewind {} {

	if {$myok} return
	set myloc [$mystackloc pop]


	return
    }

    method i_loc_push {} {

	$mystackloc push $myloc










	return
    }

    # # ## ### ##### ######## ############# #####################
    ##  API - Instructions - AST stack handling

    method i_ast_pop_rewind/discard {} {

	#$myparser i:fail_ast_pop_rewind
	#$myparser i:ok_ast_pop_discard
	#return
	set mark [$mystackmark pop]
	if {$myok} return
	$mystackast trim $mark



	return
    }

    method i_ast_pop_discard/rewind {} {

	#$myparser i:ok_ast_pop_rewind
	#$myparser i:fail_ast_pop_discard
	#return
	set mark [$mystackmark pop]
	if {!$myok} return
	$mystackast trim $mark



	return
    }

    method i_ast_pop_discard {} {

	$mystackmark pop


	return
    }



    method i_ast_pop_rewind {} {

	$mystackast trim [$mystackmark pop]


	return
    }

    method i:fail_ast_pop_rewind {} {

	if {$myok} return
	$mystackast trim [$mystackmark pop]



	return
    }

    method i_ast_push {} {

	$mystackmark push [$mystackast size]


	return
    }

    method i:ok_ast_value_push {} {

	if {!$myok} return
	$mystackast push $mysvalue



	return
    }



    # # ## ### ##### ######## ############# #####################
    ## API - Instructions - Nonterminal cache

    method i_symbol_restore {symbol} {

	# Satisfy from cache if possible.
	set k [list $myloc $symbol]
	if {![info exists mysymbol($k)]} { return 0 }



	lassign $mysymbol($k) myloc myok myerror mysvalue
	# We go forward, as the nonterminal matches (or not).

	return 1
    }

    method i_symbol_save {symbol} {

	# Store not only the value, but also how far
	# the match went (if it was a match).
	set at [$mystackloc peek]
	set k  [list $at $symbol]
	set mysymbol($k) [list $myloc $myok $myerror $mysvalue]


	return
    }

    # # ## ### ##### ######## ############# #####################
    ##  API - Instructions - Semantic values.

    method i_value_clear {} {

	set mysvalue {}


	return
    }

    method i_value_clear/leaf {symbol} {


	# not quite value_lead (guarded, and clear on fail)
	# Inlined clear, reduce, and optimized.
	# Clear ; if {$ok} {Reduce $symbol}
	set mysvalue {}
	if {!$myok} return
	set  pos [$mystackloc peek]
	incr pos








	set mysvalue [pt::ast new $symbol $pos $myloc]




	return
    }

    method i_value_clear/reduce {symbol} {

	set mysvalue {}
	if {!$myok} return

	set  mark [$mystackmark peek];# Old size of stack before current nt pushed more.
	set  newa [expr {[$mystackast size] - $mark}]

	set  pos  [$mystackloc  peek]
	incr pos

	if {!$newa} {
	    set mysvalue {}
	} elseif {$newa == 1} {
	    # peek 1 => single element comes back
	    set mysvalue [list [$mystackast peek]]     ; # SaveToMark
	} else {
	    # peek n > 1 => list of elements comes back
	    set mysvalue [lreverse [$mystackast peek $newa]]     ; # SaveToMark
	}








	set mysvalue [pt::ast new $symbol $pos $myloc {*}$mysvalue] ; # Reduce $symbol




	return
    }

    # # ## ### ##### ######## ############# #####################
    ## API - Instructions - Terminal matching

    method i_input_next {msg} {

	# Inlined: Getch, Expected, ClearErrors
	# Satisfy from input cache if possible.

	incr myloc
	# May read from the input (ExtendTC), and remember the
	# information. Note: We are implicitly incrementing the
	# location!
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list $msg]]


	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok    1
	set myerror {}
	return
    }

    method i_test_alnum {} {
	set myok [string is alnum -strict $mycurrent]
	my OkFail [pt::pe alnum]
	return
    }

    method i_test_alpha {} {
	set myok [string is alpha -strict $mycurrent]
	my OkFail [pt::pe alpha]
	return
    }

    method i_test_ascii {} {
	set myok [string is ascii -strict $mycurrent]
	my OkFail [pt::pe ascii]
	return
    }

    method i_test_control {} {
	set myok [string is control -strict $mycurrent]
	my OkFail [pt::pe control]
	return
    }

    method i_test_char {tok} {

	set myok [expr {$tok eq $mycurrent}]
	my OkFail [pt::pe terminal $tok]


	return
    }

















































    method i_test_ddigit {} {

	set myok [string match {[0-9]} $mycurrent]
	my OkFail [pt::pe ddigit]


	return
    }

    method i_test_digit {} {

	set myok [string is digit -strict $mycurrent]
	my OkFail [pt::pe digit]


	return
    }

    method i_test_graph {} {

	set myok [string is graph -strict $mycurrent]
	my OkFail [pt::pe graph]


	return
    }

    method i_test_lower {} {

	set myok [string is lower -strict $mycurrent]
	my OkFail [pt::pe lower]


	return
    }

    method i_test_print {} {

	set myok [string is print -strict $mycurrent]
	my OkFail [pt::pe printable]


	return
    }

    method i_test_punct {} {

	set myok [string is punct -strict $mycurrent]
	my OkFail [pt::pe punct]
	return
    }

    method i_test_range {toks toke} {
	set myok [expr {
			([string compare $toks $mycurrent] <= 0) &&
			([string compare $mycurrent $toke] <= 0)
		    }] ; # {}
	my OkFail [pt::pe range $toks $toke]
	return
    }

    method i_test_space {} {

	set myok [string is space -strict $mycurrent]
	my OkFail [pt::pe space]


	return
    }

    method i_test_upper {} {

	set myok [string is upper -strict $mycurrent]
	my OkFail [pt::pe upper]


	return
    }

    method i_test_wordchar {} {

	set myok [string is wordchar -strict $mycurrent]
	my OkFail [pt::pe wordchar]


	return
    }

    method i_test_xdigit {} {

	set myok [string is xdigit -strict $mycurrent]
	my OkFail [pt::pe xdigit]


	return
    }

    # # ## ### ##### ######## ############# #####################
    ## Internals

    method ExtendTC {} {
	upvar 1 mychan mychan mytoken mytoken

	if {($mychan eq {}) ||
	    [eof $mychan]} {return 0}

	set ch [read $mychan 1]
	if {$ch eq {}} {
	    return 0
	}

	append mytoken $ch
	return 1
    }

    method ExtendTCN {n} {
	upvar 1 mychan mychan mytoken mytoken

	if {($mychan eq {}) ||
	    [eof $mychan]} {return 0}

	set str [read $mychan $n]
	set k   [string length $str]

	append mytoken $str
	if {$k < $n} {
	    return 0
	}

	return 1
    }

    method OkFail {msg} {
	upvar 1 myok myok myerror myerror myloc myloc
	# Inlined: Expected, Unget, ClearErrors
	if {!$myok} {
	    set myerror [list $myloc [list $msg]]
	    incr myloc -1
	} else {
	    set myerror {}
	}
	return
    }

    # # ## ### ##### ######## ############# #####################
    ## Data structures.
    ## Mainly the architectural state of the instance's PARAM.

    variable \
	mychan mycurrent myloc mystackloc \
	myok mysvalue myerror mystackerr \
	mytoken mysymbol mystackast mystackmark


    # Parser Input (channel, location (line, column)) ...........
    # Token, current parsing location, stack of locations .......
    # Match state .  ........ ............. .....................
    # Caches for tokens and nonterminals .. .....................
    # Abstract syntax tree (AST) .......... .....................

    # # ## ### ##### ######## ############# #####################
}

# # ## ### ##### ######## ############# #####################
## Ready

package provide pt::rde::oo 1.0.3
return








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	    lassign $myerror loc messages
	    if {$loc == $pos} {
		set myerror [list $loc [list [list n $symbol]]]
	    }
	}}

	$mystackast trim* [$mystackmark pop]
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:void_clear_symbol_end {symbol} {
	debug.pt/rdengine {[Instruction si:void_clear_symbol_end $symbol]}
	# i_value_clear
	# i_symbol_save       $symbol
	# i_error_nonterminal $symbol
	# i_loc_pop_discard

	set mysvalue {}
	set at [$mystackloc pop]

	set k  [list $at $symbol]
	set mysymbol($k) [list $myloc $myok $myerror $mysvalue]

	# si:void_clear_symbol_end / i_error_nonterminal -- inlined -- disabled
	if {0} {if {[llength $myerror]} {
	    set  pos $at
	    incr pos
	    lassign $myerror loc messages
	    if {$loc == $pos} {
		set myerror [list $loc [list [list n $symbol]]]
	    }
	}}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    # # ## ### ##### ######## ############# #####################
    ## API - Instructions - Control flow

    method i:ok_continue {} {
	debug.pt/rdengine {[Instruction i:ok_continue]}
	if {!$myok} return
	return -code continue
    }

    method i:fail_continue {} {
	debug.pt/rdengine {[Instruction i:fail_continue]}
	if {$myok} return
	return -code continue
    }

    method i:fail_return {} {
	debug.pt/rdengine {[Instruction i:fail_return]}
	if {$myok} return
	return -code return
    }

    method i:ok_return {} {
	debug.pt/rdengine {[Instruction i:ok_return]}
	if {!$myok} return
	return -code return
    }

    # # ## ### ##### ######## ############# #####################
    ##  API - Instructions - Unconditional matching.

    method i_status_ok {} {
	debug.pt/rdengine {[Instruction i_status_ok]}
	set myok 1
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_status_fail {} {
	debug.pt/rdengine {[Instruction i_status_fail]}
	set myok 0
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_status_negate {} {
	debug.pt/rdengine {[Instruction i_status_negate]}
	set myok [expr {!$myok}]
	debug.pt/rdengine {[InstReturn]}
	return
    }

    # # ## ### ##### ######## ############# #####################
    ##  API - Instructions - Error handling.

    method i_error_clear {} {
	debug.pt/rdengine {[Instruction i_error_clear]}
	set myerror {}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_error_push {} {
	debug.pt/rdengine {[Instruction i_error_push]}
	$mystackerr push $myerror
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_error_clear_push {} {
	debug.pt/rdengine {[Instruction i_error_clear_push]}
	set myerror {}
	$mystackerr push {}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_error_pop_merge {} {
	debug.pt/rdengine {[Instruction i_error_pop_merge]}
	set olderror [$mystackerr pop]

	# We have either old or new error data, keep it.

	if {![llength $myerror]}  { set myerror $olderror ; debug.pt/rdengine {[InstReturn]} ; return }
	if {![llength $olderror]} { debug.pt/rdengine {[InstReturn]} ; return }

	# If one of the errors is further on in the input choose that as
	# the information to propagate.

	lassign $myerror  loe msgse
	lassign $olderror lon msgsn

	if {$lon > $loe} { set myerror $olderror ; debug.pt/rdengine {[InstReturn]} ; return }
	if {$loe > $lon} { debug.pt/rdengine {[InstReturn]} ; return }

	# Equal locations, merge the message lists.

	set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_error_nonterminal {symbol} {
	debug.pt/rdengine {[Instruction i_error_nonterminal $symbol]}
	#  i_error_nonterminal -- Disabled. Generate only low-level
	#  i_error_nonterminal -- errors until we have worked out how
	#  i_error_nonterminal -- to integrate symbol information with
	#  i_error_nonterminal -- them. Do not forget where this
	#  i_error_nonterminal -- instruction is inlined.
	return

	# Inlined: Errors, Expected.
	if {![llength $myerror]} {
	    debug.pt/rdengine {no error}
	    return
	}
	set pos [$mystackloc peek]
	incr pos
	lassign $myerror loc messages
	if {$loc != $pos} {
	    debug.pt/rdengine {my $myerror != pos $pos}
	    return
	}
	set myerror [list $loc [list [list n $symbol]]]

	debug.pt/rdengine {::= ($myerror)}
	return
    }

    # # ## ### ##### ######## ############# #####################
    ##  API - Instructions - Basic input handling and tracking

    method i_loc_pop_rewind/discard {} {
	debug.pt/rdengine {[Instruction i_loc_pop_rewind/discard]}
	#$myparser i:fail_loc_pop_rewind
	#$myparser i:ok_loc_pop_discard
	#return
	set last [$mystackloc pop]
	if {!$myok} {
	    set myloc $last
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_loc_pop_discard {} {
	debug.pt/rdengine {[Instruction i_loc_pop_discard]}
	$mystackloc pop
	debug.pt/rdengine {[InstReturn]}
	return
    }

    # i:ok_loc_pop_discard - all uses inlined

    method i_loc_pop_rewind {} {
	debug.pt/rdengine {[Instruction i_loc_pop_rewind]}
	set myloc [$mystackloc pop]
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i:fail_loc_pop_rewind {} {
	debug.pt/rdengine {[Instruction i:fail_loc_pop_rewind]}
	if {!$myok} {
	    set myloc [$mystackloc pop]
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_loc_push {} {
	debug.pt/rdengine {[Instruction i_loc_push]}
	$mystackloc push $myloc
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_loc_rewind {} {
	debug.pt/rdengine {[Instruction i_loc_rewind]}
	# i_loc_pop_rewind - set myloc [$mystackloc pop]
	# i_loc_push       - $mystackloc push $myloc    
	set myloc [$mystackloc peek]
	debug.pt/rdengine {[InstReturn]}
	return
    }

    # # ## ### ##### ######## ############# #####################
    ##  API - Instructions - AST stack handling

    method i_ast_pop_rewind/discard {} {
	debug.pt/rdengine {[Instruction i_ast_pop_rewind/discard]}
	#$myparser i:fail_ast_pop_rewind
	#$myparser i:ok_ast_pop_discard
	#return
	set mark [$mystackmark pop]
	if {!$myok} {
	    $mystackast trim* $mark
	}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_ast_pop_discard/rewind {} {
	debug.pt/rdengine {[Instruction i_ast_pop_discard/rewind]}
	#$myparser i:ok_ast_pop_rewind
	#$myparser i:fail_ast_pop_discard
	#return
	set mark [$mystackmark pop]
	if {$myok} {
	    $mystackast trim* $mark
	}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_ast_pop_discard {} {
	debug.pt/rdengine {[Instruction i_ast_pop_discard]}
	$mystackmark pop

	debug.pt/rdengine {[InstReturn]}
	return
    }

    # i:ok_ast_pop_discard - all uses inlined

    method i_ast_pop_rewind {} {
	debug.pt/rdengine {[Instruction i_ast_pop_rewind]}
	$mystackast trim* [$mystackmark pop]

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i:fail_ast_pop_rewind {} {
	debug.pt/rdengine {[Instruction i:fail_ast_pop_rewind]}
	if {!$myok} {
	    $mystackast trim* [$mystackmark pop]
	}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_ast_push {} {
	debug.pt/rdengine {[Instruction i_ast_push]}
	$mystackmark push [$mystackast size]

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i:ok_ast_value_push {} {
	debug.pt/rdengine {[Instruction i:ok_ast_value_push]}
	if {$myok} {
	    $mystackast push $mysvalue
	}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    # i_ast_rewind - all uses inlined

    # # ## ### ##### ######## ############# #####################
    ## API - Instructions - Nonterminal cache

    method i_symbol_restore {symbol} {
	debug.pt/rdengine {[Instruction i_symbol_restore $symbol]}
	# Satisfy from cache if possible.
	set k [list $myloc $symbol]
	if {![info exists mysymbol($k)]} {
	    debug.pt/rdengine {[InstReturn]}
	    return 0
	}
	lassign $mysymbol($k) myloc myok myerror mysvalue
	# We go forward, as the nonterminal matches (or not).
	debug.pt/rdengine {[InstReturn]}
	return 1
    }

    method i_symbol_save {symbol} {
	debug.pt/rdengine {[Instruction i_symbol_save $symbol]}
	# Store not only the value, but also how far
	# the match went (if it was a match).
	set at [$mystackloc peek]
	set k  [list $at $symbol]
	set mysymbol($k) [list $myloc $myok $myerror $mysvalue]

	debug.pt/rdengine {[InstReturn]}
	return
    }

    # # ## ### ##### ######## ############# #####################
    ##  API - Instructions - Semantic values.

    method i_value_clear {} {
	debug.pt/rdengine {[Instruction i_value_clear]}
	set mysvalue {}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_value_clear/leaf {symbol} {
	debug.pt/rdengine {[Instruction i_value_clear/leaf $symbol] :: ([expr {[$mystackloc peek]+1}])-@$myloc)}

	# not quite value_lead (guarded, and clear on fail)
	# Inlined clear, reduce, and optimized.
	# Clear ; if {$ok} {Reduce $symbol}
	set mysvalue {}
        if {$myok} {
	    set  pos [$mystackloc peek]
	    incr pos

	    if {($pos - 1) == $myloc} {
		# The symbol did not process any input. As this is
		# signaled to be ok (*) we create a node covering an
		# empty range. (Ad *): Can happen for a RHS using
		# toplevel operators * or ?.
		set mysvalue [pt::ast new0 $symbol $pos]
	    } else {
		set mysvalue [pt::ast new $symbol $pos $myloc]
	    }
	}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_value_clear/reduce {symbol} {
	debug.pt/rdengine {[Instruction i_value_clear/reduce $symbol]}
	set mysvalue {}
        if {$myok} {

	    set  mark [$mystackmark peek];# Old size of stack before current nt pushed more.
	    set  newa [expr {[$mystackast size] - $mark}]

	    set  pos  [$mystackloc  peek]
	    incr pos

	    if {!$newa} {
		set mysvalue {}
	    } elseif {$newa == 1} {
		# peek 1 => single element comes back
		set mysvalue [list [$mystackast peek]]     ; # SaveToMark
	    } else {
		# peek n > 1 => list of elements comes back
		set mysvalue [$mystackast peekr $newa]     ; # SaveToMark
	    }

	    if {($pos - 1) == $myloc} {
		# The symbol did not process any input. As this is
		# signaled to be ok (*) we create a node covering an
		# empty range. (Ad *): Can happen for a RHS using
		# toplevel operators * or ?.
		set mysvalue [pt::ast new0 $symbol $pos {*}$mysvalue]
	    } else {
		set mysvalue [pt::ast new $symbol $pos $myloc {*}$mysvalue] ; # Reduce $symbol
	    }
	}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    # # ## ### ##### ######## ############# #####################
    ## API - Instructions - Terminal matching

    method i_input_next {msg} {
	debug.pt/rdengine {[Instruction i_input_next $msg]}
	# Inlined: Getch, Expected, ClearErrors
	# Satisfy from input cache if possible.

	incr myloc
	# May read from the input (ExtendTC), and remember the
	# information. Note: We are implicitly incrementing the
	# location!
	if {($myloc >= [string length $mytoken]) && ![my ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list $msg]]

	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok    1
	set myerror {}


	debug.pt/rdengine {[InstReturn]}





















	return
    }

    method i_test_char {tok} {
	debug.pt/rdengine {[Instruction i_test_char $tok] :: ok [expr {$tok eq $mycurrent}], [expr {$tok eq $mycurrent ? "@$myloc" : "back@[expr {$myloc-1}]"}]}
	set myok [expr {$tok eq $mycurrent}]
	my OkFailD {pt::pe terminal $tok}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_test_range {toks toke} {
	debug.pt/rdengine {[Instruction i_test_range $toks $toke]}
	set myok [expr {
			([string compare $toks $mycurrent] <= 0) &&
			([string compare $mycurrent $toke] <= 0)
		    }] ; # {}
	my OkFailD {pt::pe range $toks $toke}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_test_alnum {} {
	debug.pt/rdengine {[Instruction i_test_alnum]}
	set myok [string is alnum -strict $mycurrent]
	my OkFailD {pt::pe alnum}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_test_alpha {} {
	debug.pt/rdengine {[Instruction i_test_alpha]}
	set myok [string is alpha -strict $mycurrent]
	my OkFailD {pt::pe alpha}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_test_ascii {} {
	debug.pt/rdengine {[Instruction i_test_ascii]}
	set myok [string is ascii -strict $mycurrent]
	my OkFailD {pt::pe ascii}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_test_control {} {
	debug.pt/rdengine {[Instruction i_test_control]}
	set myok [string is control -strict $mycurrent]
	my OkFailD {pt::pe control}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_test_ddigit {} {
	debug.pt/rdengine {[Instruction i_test_ddigit]}
	set myok [string match {[0-9]} $mycurrent]
	my OkFailD {pt::pe ddigit}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_test_digit {} {
	debug.pt/rdengine {[Instruction i_test_digit]}
	set myok [string is digit -strict $mycurrent]
	my OkFailD {pt::pe digit}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_test_graph {} {
	debug.pt/rdengine {[Instruction i_test_graph]}
	set myok [string is graph -strict $mycurrent]
	my OkFailD {pt::pe graph}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_test_lower {} {
	debug.pt/rdengine {[Instruction i_test_lower]}
	set myok [string is lower -strict $mycurrent]
	my OkFailD {pt::pe lower}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_test_print {} {
	debug.pt/rdengine {[Instruction i_test_print]}
	set myok [string is print -strict $mycurrent]
	my OkFailD {pt::pe printable}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_test_punct {} {
	debug.pt/rdengine {[Instruction i_test_punct]}
	set myok [string is punct -strict $mycurrent]
	my OkFailD {pt::pe punct}


	debug.pt/rdengine {[InstReturn]}






	return
    }

    method i_test_space {} {
	debug.pt/rdengine {[Instruction i_test_space]}
	set myok [string is space -strict $mycurrent]
	my OkFailD {pt::pe space}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_test_upper {} {
	debug.pt/rdengine {[Instruction i_test_upper]}
	set myok [string is upper -strict $mycurrent]
	my OkFailD {pt::pe upper}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_test_wordchar {} {
	debug.pt/rdengine {[Instruction i_test_wordchar]}
	set myok [string is wordchar -strict $mycurrent]
	my OkFailD {pt::pe wordchar}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_test_xdigit {} {
	debug.pt/rdengine {[Instruction i_test_xdigit]}
	set myok [string is xdigit -strict $mycurrent]
	my OkFailD {pt::pe xdigit}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    # # ## ### ##### ######## ############# #####################
    ## Internals

    method ExtendTC {} {


	if {($mychan eq {}) ||
	    [eof $mychan]} {return 0}

	set ch [read $mychan 1]
	if {$ch eq {}} {
	    return 0
	}

	append mytoken $ch
	return 1
    }

    method ExtendTCN {n} {


	if {($mychan eq {}) ||
	    [eof $mychan]} {return 0}

	set str [read $mychan $n]
	set k   [string length $str]

	append mytoken $str
	if {$k < $n} {
	    return 0
	}

	return 1
    }

    method OkFailD {msgcmd} {

	# Inlined: Expected, Unget, ClearErrors
	if {!$myok} {
	    set myerror [list $myloc [list [uplevel 1 $msgcmd]]]
	    incr myloc -1
	} else {
	    set myerror {}
	}
	return
    }

    # # ## ### ##### ######## ############# #####################
    ## Data structures.
    ## Mainly the architectural state of the instance's PARAM.

    variable \
	mychan mycurrent myloc mystackloc \
	myok mysvalue myerror mystackerr \
	mytoken mysymbol mystackast mystackmark \
	mytracecounter

    # Parser Input (channel, location (line, column)) ...........
    # Token, current parsing location, stack of locations .......
    # Match state .  ........ ............. .....................
    # Caches for tokens and nonterminals .. .....................
    # Abstract syntax tree (AST) .......... .....................

    # # ## ### ##### ######## ############# #####################
}

# # ## ### ##### ######## ############# #####################
## Ready

package provide pt::rde::oo 1.1
return

Changes to modules/pt/pt_rdengine_tcl.tcl. 

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# -*- tcl -*-
#
# Copyright (c) 2009-2014 by Andreas Kupries <[email protected]>

# # ## ### ##### ######## ############# #####################
## Package description

## Implementation of the PackRat Machine (PARAM), a virtual machine on
## top of which parsers for Parsing Expression Grammars (PEGs) can be
## realized. This implementation is tied to Tcl for control flow. We
## (will) have alternate implementations written in TclOO, and critcl,
## all exporting the same API.
#
## RD stands for Recursive Descent.

# # ## ### ##### ######## ############# #####################
## Requisites

package require Tcl 8.5
package require snit
package require struct::stack 1.5 ; # Requiring peekr, getr, trim* methods
package require pt::ast
package require pt::pe




package require char ; # quoting




# # ## ### ##### ######## ############# #####################
## Implementation

snit::type ::pt::rde_tcl {




























































    # # ## ### ##### ######## ############# #####################
    ## API - Lifecycle

    constructor {} {


	set mystackloc  [struct::stack ${selfns}::LOC]  ; # LS
	set mystackerr  [struct::stack ${selfns}::ERR]  ; # ES
	set mystackast  [struct::stack ${selfns}::AST]  ; # ARS/AS
	set mystackmark [struct::stack ${selfns}::MARK] ; # s.a.


	return
    }

    #TRACE variable count 0
    #variable count 0

    method reset {{chan {}}} { ; #set count 0

                               ; #TRACE puts "[format %8d [incr count]] RDE reset"
	set mychan    $chan      ; # IN
	set mycurrent {}         ; # CC
	set myloc     -1         ; # CL
	set myok      0          ; # ST
	set msvalue   {}         ; # SV
	set myerror   {}         ; # ER
	set mytoken   {}         ; # TC
	array unset   mysymbol * ; # NC

	$mystackloc  clear
	$mystackerr  clear
	$mystackast  clear
	$mystackmark clear


	return
    }

    method complete {} { ; #TRACE puts "[format %8d [incr count]] RDE complete"


	if {$myok} {
	    set n [$mystackast size]

	    if {$n > 1} {

		set  pos [$mystackloc peek]
		incr pos
		set children [$mystackast peekr [$mystackast size]] ; # SaveToMark
		return [pt::ast new {} $pos $myloc {*}$children]    ; # Reduce ALL



	    } elseif {$n == 0} {
		# Match, but no AST. This is possible if the grammar
		# consists of only the start expression.


		return {}
	    } else {

		return [$mystackast peek]


	    }
	} else {
	    lassign $myerror loc messages
	    return -code error \
		-errorcode {PT RDE SYNTAX} \
		[list pt::rde $loc $messages]
	}
    }

    # # ## ### ##### ######## ############# #####################
    ## API - State accessors

    method chan   {} { return $mychan }

    # - - -- --- ----- --------

    method current  {} { return $mycurrent }
    method location {} { return $myloc }
    method lmarked  {} { return [$mystackloc getr] }

    # - - -- --- ----- --------

    method ok      {} { return $myok      }
    method value   {} { return $mysvalue  }
    method error   {} { return $myerror   }
    method emarked {} { return [$mystackerr getr] }

    # - - -- --- ----- --------

    method tokens {{from {}} {to {}}} { ; #TRACE puts "[format %8d [incr count]] RDE tokens"

	switch -exact [llength [info level 0]] {
	    5 { return $mytoken }
	    6 { return [string range $mytoken $from $from] }
	    7 { return [string range $mytoken $from $to] }
	}
    }

    method symbols {} { ; #TRACE puts "[format %8d [incr count]] RDE symbols"

	return [array get mysymbol]
    }

    method scached {} { ; #TRACE puts "[format %8d [incr count]] RDE scached"

	return [array names mysymbol]
    }

    # - - -- --- ----- --------

    method asts    {} { return [$mystackast  getr] }
    method amarked {} { return [$mystackmark getr] }
    method ast     {} { return [$mystackast  peek] }

    # # ## ### ##### ######## ############# #####################
    ## API - Preloading the token cache.

    method data {data} { ; #TRACE puts "[format %8d [incr count]] RDE data"

	append mytoken $data
	return
    }

    # # ## ### ##### ######## ############# #####################
    ## Common instruction sequences

    method si:void_state_push {} { ; #TRACE puts "[format %8d [incr count]] RDE si:void_state_push"

	# i_loc_push
	# i_error_clear_push
	$mystackloc push $myloc
	set myerror {}
	$mystackerr push {}


	return
    }

    method si:void2_state_push {} { ; #TRACE puts "[format %8d [incr count]] RDE si:void2_state_push"

	# i_loc_push
	# i_error_push
	$mystackloc push $myloc
	$mystackerr push {}


	return
    }

    method si:value_state_push {} { ; #TRACE puts "[format %8d [incr count]] RDE si:value_state_push"

	# i_ast_push
	# i_loc_push
	# i_error_clear_push
	$mystackmark push [$mystackast size]
	$mystackloc push $myloc
	set myerror {}
	$mystackerr push {}


	return
    }

    # - -- --- ----- -------- ------------- ---------------------

    method si:void_state_merge {} { ; #TRACE puts "[format %8d [incr count]] RDE si:void_state_merge"

	# i_error_pop_merge
	# i_loc_pop_rewind/discard

	set olderror [$mystackerr pop]
	# We have either old or new error data, keep it.
	if {![llength $myerror]}  {
	    set myerror $olderror



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# -*- tcl -*-
#
# Copyright (c) 2009-2015 by Andreas Kupries <[email protected]>

# # ## ### ##### ######## ############# #####################
## Package description

## Implementation of the PackRat Machine (PARAM), a virtual machine on
## top of which parsers for Parsing Expression Grammars (PEGs) can be
## realized. This implementation is tied to Tcl for control flow. We
## (will) have alternate implementations written in TclOO, and critcl,
## all exporting the same API.
#
## RD stands for Recursive Descent.

# # ## ### ##### ######## ############# #####################
## Requisites

package require Tcl 8.5
package require snit
package require struct::stack 1.5 ; # Requiring peekr, getr, get, trim* methods
package require pt::ast
package require pt::pe

# # ## ### ##### ######## ############# #####################
## Support narrative tracing.

package require debug
debug level  pt/rdengine
debug prefix pt/rdengine {}


# # ## ### ##### ######## ############# #####################
## Implementation

snit::type ::pt::rde_tcl {
    # # ## ### ##### ######## ############# #####################
    ## Instruction counter for tracing. Unused else. Plus other helpers.
    variable trace 0

    proc Instruction {label {a {}} {b {}}} {
	upvar 1 self self trace trace myok myok myloc myloc mycurrent mycurrent mysvalue mysvalue myerror myerror __inst theinst
	set theinst [list $label $a $b]
	return "$self <<[format %08d [incr trace]]>> START I:[format %-30s $label] [format %-10s $a] [format %-10s $b] :: [State]"
    }

    proc InstReturn {} {
	upvar 1 self self trace trace myok myok myloc myloc mycurrent mycurrent mysvalue mysvalue myerror myerror __inst theinst
	lassign $theinst label a b
	return "$self <<[format %08d $trace]>> END__ I:[format %-30s $label] [format %-10s $a] [format %-10s $b] :: [State]"
    }

    proc State {} {
	upvar 1 myok myok myloc myloc mycurrent mycurrent mysvalue mysvalue myerror myerror
	return "ST $myok CL $myloc CC ($mycurrent) SV ($mysvalue) ER ($myerror)"
    }

    proc TraceSetupStacks {} {
	upvar selfns selfns

	# Move stack instances aside.
	rename ${selfns}::LOC   ${selfns}::LOC__
	rename ${selfns}::ERR   ${selfns}::ERR__
	rename ${selfns}::AST   ${selfns}::AST__
	rename ${selfns}::MARK  ${selfns}::MRK__

	# Create procedures doing tracing, and forwarding to the
	# renamed actual instances.

	interp alias {} ${selfns}::LOC  {} ${selfns}::WRAP LS  LOC__
	interp alias {} ${selfns}::ERR  {} ${selfns}::WRAP ES  ERR__
	interp alias {} ${selfns}::AST  {} ${selfns}::WRAP ARS AST__
	interp alias {} ${selfns}::MARK {} ${selfns}::WRAP ASM MRK__

	proc ${selfns}::WRAP {label stack args} {
	    debug.pt/rdengine {    $label ___ $args}
	    set res [$stack {*}$args]

	    # Show state state after the op
	    set n [$stack size]
	    if {!$n} {
		set c {()}
	    } elseif {$n == 1} {
		set c <<[$stack peek $n]>>
	    } else {
		set c <<[join [$stack peek $n] {>> <<}]>>
	    }
	    debug.pt/rdengine {    $label ==  ($n):$c}

	    # And op return
	    debug.pt/rdengine {    $label ==> ($res)}
	    return $res
	}
	return
    }

    # # ## ### ##### ######## ############# #####################
    ## API - Lifecycle

    constructor {} {
	debug.pt/rdengine {$self constructor}

	set mystackloc  [struct::stack ${selfns}::LOC]  ; # LS
	set mystackerr  [struct::stack ${selfns}::ERR]  ; # ES
	set mystackast  [struct::stack ${selfns}::AST]  ; # ARS/AS
	set mystackmark [struct::stack ${selfns}::MARK] ; # s.a.

	debug.pt/rdengine {[TraceSetupStacks]$self constructor /done}
	return
    }




    method reset {{chan {}}} {
	debug.pt/rdengine {$self reset ($chan)}

	set mychan    $chan      ; # IN
	set mycurrent {}         ; # CC
	set myloc     -1         ; # CL
	set myok      0          ; # ST
	set msvalue   {}         ; # SV
	set myerror   {}         ; # ER
	set mytoken   {}         ; # TC (string)
	array unset   mysymbol * ; # NC

	$mystackloc  clear
	$mystackerr  clear
	$mystackast  clear
	$mystackmark clear

	debug.pt/rdengine {$self reset /done}
	return
    }

    method complete {} {
	debug.pt/rdengine {$self complete [State]}

	if {$myok} {
	    set n [$mystackast size]
	    debug.pt/rdengine {$self complete ast $n}
	    if {$n > 1} {
		# Multiple ASTs left, reduce into single containing them.
		set  pos [$mystackloc peek]
		incr pos
		set children [$mystackast peekr [$mystackast size]] ; # SaveToMark
		set ast [pt::ast new {} $pos $myloc {*}$children]    ; # Reduce ALL

		debug.pt/rdengine {$self complete n ==> ($ast)}
		return $ast
	    } elseif {$n == 0} {
		# Match, but no AST. This is possible if the grammar
		# consists of only the start expression.

		debug.pt/rdengine {$self complete 0 ==> ()}
		return {}
	    } else {
		# Match, with AST.
		set ast [$mystackast peek]
		debug.pt/rdengine {$self complete 1 ==> ($ast)}
		return $ast
	    }
	} else {
	    lassign $myerror loc messages
	    return -code error \
		-errorcode {PT RDE SYNTAX} \
		[list pt::rde $loc $messages]
	}
    }

    # # ## ### ##### ######## ############# #####################
    ## API - State accessors

    method chan   {} { debug.pt/rdengine {$self chan} ; return $mychan }

    # - - -- --- ----- --------

    method current  {} { debug.pt/rdengine {$self current}  ; return $mycurrent }
    method location {} { debug.pt/rdengine {$self location} ; return $myloc }
    method lmarked  {} { debug.pt/rdengine {$self lmarked}  ; return [$mystackloc getr] }

    # - - -- --- ----- --------

    method ok      {} { debug.pt/rdengine {$self ok}      ; return $myok      }
    method value   {} { debug.pt/rdengine {$self value}   ; return $mysvalue  }
    method error   {} { debug.pt/rdengine {$self error}   ; return $myerror   }
    method emarked {} { debug.pt/rdengine {$self emarked} ; return [$mystackerr getr] }

    # - - -- --- ----- --------

    method tokens {{from {}} {to {}}} {
	debug.pt/rdengine {$self tokens ($from) ($to)}
	switch -exact [llength [info level 0]] {
	    5 { return $mytoken }
	    6 { return [string range $mytoken $from $from] }
	    7 { return [string range $mytoken $from $to] }
	}
    }

    method symbols {} {
	debug.pt/rdengine {$self symbols}
	return [array get mysymbol]
    }

    method scached {} {
	debug.pt/rdengine {$self scached}
	return [array names mysymbol]
    }

    # - - -- --- ----- --------

    method asts    {} { debug.pt/rdengine {$self asts}    ; return [$mystackast  getr] }
    method amarked {} { debug.pt/rdengine {$self amarked} ; return [$mystackmark getr] }
    method ast     {} { debug.pt/rdengine {$self ast}     ; return [$mystackast  peek] }

    # # ## ### ##### ######## ############# #####################
    ## API - Preloading the token cache.

    method data {data} {
	debug.pt/rdengine {$self data +[string length $data]}
	append mytoken $data
	return
    }

    # # ## ### ##### ######## ############# #####################
    ## Common instruction sequences

    method si:void_state_push {} {
	debug.pt/rdengine {[Instruction si:void_state_push]}
	# i_loc_push
	# i_error_clear_push
	$mystackloc push $myloc
	set myerror {}
	$mystackerr push {}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:void2_state_push {} {
	debug.pt/rdengine {[Instruction si:void2_state_push]}
	# i_loc_push
	# i_error_push
	$mystackloc push $myloc
	$mystackerr push {}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:value_state_push {} {
	debug.pt/rdengine {[Instruction si:value_state_push]}
	# i_ast_push
	# i_loc_push
	# i_error_clear_push
	$mystackmark push [$mystackast size]
	$mystackloc push $myloc
	set myerror {}
	$mystackerr push {}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    # - -- --- ----- -------- ------------- ---------------------

    method si:void_state_merge {} {
	debug.pt/rdengine {[Instruction si:void_state_merge]}
	# i_error_pop_merge
	# i_loc_pop_rewind/discard

	set olderror [$mystackerr pop]
	# We have either old or new error data, keep it.
	if {![llength $myerror]}  {
	    set myerror $olderror
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	    } elseif {$loe == $lon} {
		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}

	set last [$mystackloc pop]
	if {$myok} return
	set myloc $last


	return
    }

    method si:void_state_merge_ok {} { ; #TRACE puts "[format %8d [incr count]] RDE si:void_state_merge_ok"

	# i_error_pop_merge
	# i_loc_pop_rewind/discard
	# i_status_ok

	set olderror [$mystackerr pop]
	# We have either old or new error data, keep it.
	if {![llength $myerror]}  {








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	    } elseif {$loe == $lon} {
		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}

	set last [$mystackloc pop]
	if {!$myok} {
	    set myloc $last
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:void_state_merge_ok {} {
	debug.pt/rdengine {[Instruction si:void_state_merge_ok]}
	# i_error_pop_merge
	# i_loc_pop_rewind/discard
	# i_status_ok

	set olderror [$mystackerr pop]
	# We have either old or new error data, keep it.
	if {![llength $myerror]}  {
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	    } elseif {$loe == $lon} {
		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}

	set last [$mystackloc pop]
	if {$myok} return
	set myloc $last
	set myok 1



	return
    }

    method si:value_state_merge {} { ; #TRACE puts "[format %8d [incr count]] RDE si:value_state_merge"

	# i_error_pop_merge
	# i_ast_pop_rewind/discard
	# i_loc_pop_rewind/discard

	set olderror [$mystackerr pop]
	# We have either old or new error data, keep it.
	if {![llength $myerror]}  {








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	    } elseif {$loe == $lon} {
		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}

	set last [$mystackloc pop]
	if {!$myok} {
	    set myloc $last
	    set myok 1
	}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:value_state_merge {} {
	debug.pt/rdengine {[Instruction si:value_state_merge]}
	# i_error_pop_merge
	# i_ast_pop_rewind/discard
	# i_loc_pop_rewind/discard

	set olderror [$mystackerr pop]
	# We have either old or new error data, keep it.
	if {![llength $myerror]}  {
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		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}

	set mark [$mystackmark pop]
	set last [$mystackloc pop]
	if {$myok} return
	$mystackast trim* $mark
	set myloc $last



	return
    }

    # - -- --- ----- -------- ------------- ---------------------

    method si:value_notahead_start {} { ; #TRACE puts "[format %8d [incr count]] RDE si:value_notahead_start"

	# i_loc_push
	# i_ast_push

	$mystackloc  push $myloc
	$mystackmark push [$mystackast size]


	return
    }

    method si:void_notahead_exit {} { ; #TRACE puts "[format %8d [incr count]] RDE si:void_notahead_exit"

	# i_loc_pop_rewind
	# i_status_negate

	set myloc [$mystackloc pop]
	set myok [expr {!$myok}]


	return
    }

    method si:value_notahead_exit {} { ; #TRACE puts "[format %8d [incr count]] RDE si:value_notahead_exit"

	# i_ast_pop_discard/rewind
	# i_loc_pop_rewind
	# i_status_negate

	set mark [$mystackmark pop]
	if {$myok} {
	    $mystackast trim* $mark
	}
	set myloc [$mystackloc pop]
	set myok [expr {!$myok}]


	return
    }

    # - -- --- ----- -------- ------------- ---------------------

    method si:kleene_abort {} { ; #TRACE puts "[format %8d [incr count]] RDE si:kleene_abort"

	# i_loc_pop_rewind/discard
	# i:fail_return

	set last [$mystackloc pop]
	if {$myok} return



	set myloc $last

	return -code return
    }

    method si:kleene_close {} { ; #TRACE puts "[format %8d [incr count]] RDE si:kleene_close"

	# i_error_pop_merge
	# i_loc_pop_rewind/discard
	# i:fail_status_ok
	# i:fail_return

	set olderror [$mystackerr pop]
	# We have either old or new error data, keep it.








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		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}

	set mark [$mystackmark pop]
	set last [$mystackloc pop]
	if {!$myok} {
	    $mystackast trim* $mark
	    set myloc $last
	}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    # - -- --- ----- -------- ------------- ---------------------

    method si:value_notahead_start {} {
	debug.pt/rdengine {[Instruction si:value_notahead_start]}
	# i_loc_push
	# i_ast_push

	$mystackloc  push $myloc
	$mystackmark push [$mystackast size]

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:void_notahead_exit {} {
	debug.pt/rdengine {[Instruction si:void_notahead_exit]}
	# i_loc_pop_rewind
	# i_status_negate

	set myloc [$mystackloc pop]
	set myok [expr {!$myok}]

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:value_notahead_exit {} {
	debug.pt/rdengine {[Instruction si:value_notahead_exit]}
	# i_ast_pop_discard/rewind
	# i_loc_pop_rewind
	# i_status_negate

	set mark [$mystackmark pop]
	if {$myok} {
	    $mystackast trim* $mark
	}
	set myloc [$mystackloc pop]
	set myok [expr {!$myok}]

	debug.pt/rdengine {[InstReturn]}
	return
    }

    # - -- --- ----- -------- ------------- ---------------------

    method si:kleene_abort {} {
	debug.pt/rdengine {[Instruction si:kleene_abort]}
	# i_loc_pop_rewind/discard
	# i:fail_return

	set last [$mystackloc pop]
	if {$myok} {
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set myloc $last
	debug.pt/rdengine {[InstReturn]}
	return -code return
    }

    method si:kleene_close {} {
	debug.pt/rdengine {[Instruction si:kleene_close]}
	# i_error_pop_merge
	# i_loc_pop_rewind/discard
	# i:fail_status_ok
	# i:fail_return

	set olderror [$mystackerr pop]
	# We have either old or new error data, keep it.
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	    } elseif {$loe == $lon} {
		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}

	set last [$mystackloc pop]
	if {$myok} return



	set myok 1
	set myloc $last


	return -code return
    }

    # - -- --- ----- -------- ------------- ---------------------

    method si:voidvoid_branch {} { ; #TRACE puts "[format %8d [incr count]] RDE si:voidvoid_branch"

	# i_error_pop_merge
	# i:ok_loc_pop_discard
	# i:ok_return
	# i_loc_rewind
	# i_error_push

	set olderror [$mystackerr pop]








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	    } elseif {$loe == $lon} {
		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}

	set last [$mystackloc pop]
	if {$myok} {
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set myok 1
	set myloc $last

	debug.pt/rdengine {[InstReturn]}
	return -code return
    }

    # - -- --- ----- -------- ------------- ---------------------

    method si:voidvoid_branch {} {
	debug.pt/rdengine {[Instruction si:voidvoid_branch]}
	# i_error_pop_merge
	# i:ok_loc_pop_discard
	# i:ok_return
	# i_loc_rewind
	# i_error_push

	set olderror [$mystackerr pop]
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		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}

	if {$myok} {
	    $mystackloc pop

	    return -code return
	}
	set myloc [$mystackloc peek]
	$mystackerr push $myerror


	return
    }

    method si:voidvalue_branch {} { ; #TRACE puts "[format %8d [incr count]] RDE si:voidvalue_branch"

	# i_error_pop_merge
	# i:ok_loc_pop_discard
	# i:ok_return
	# i_ast_push
	# i_loc_rewind
	# i_error_push









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		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}

	if {$myok} {
	    $mystackloc pop
	    debug.pt/rdengine {[InstReturn]}
	    return -code return
	}
	set myloc [$mystackloc peek]
	$mystackerr push $myerror

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:voidvalue_branch {} {
	debug.pt/rdengine {[Instruction si:voidvalue_branch]}
	# i_error_pop_merge
	# i:ok_loc_pop_discard
	# i:ok_return
	# i_ast_push
	# i_loc_rewind
	# i_error_push
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		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}

	if {$myok} {
	    $mystackloc pop

	    return -code return
	}
	$mystackmark push [$mystackast size]
	set myloc [$mystackloc peek]
	$mystackerr push {}


	return
    }

    method si:valuevoid_branch {} { ; #TRACE puts "[format %8d [incr count]] RDE si:valuevoid_branch"

	# i_error_pop_merge
	# i_ast_pop_rewind/discard
	# i:ok_loc_pop_discard
	# i:ok_return
	# i_loc_rewind
	# i_error_push









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555

		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}

	if {$myok} {
	    $mystackloc pop
	    debug.pt/rdengine {[InstReturn]}
	    return -code return
	}
	$mystackmark push [$mystackast size]
	set myloc [$mystackloc peek]
	$mystackerr push {}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:valuevoid_branch {} {
	debug.pt/rdengine {[Instruction si:valuevoid_branch]}
	# i_error_pop_merge
	# i_ast_pop_rewind/discard
	# i:ok_loc_pop_discard
	# i:ok_return
	# i_loc_rewind
	# i_error_push
︙︙
435
436
437
438
439
440
441

442
443
444
445
446


447
448
449
450

451
452
453
454
455
456
457

		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}
	set mark [$mystackmark pop]
	if {$myok} {
	    $mystackloc pop

	    return -code return
	}
	$mystackast trim* $mark
	set myloc [$mystackloc peek]
	$mystackerr push {}


	return
    }

    method si:valuevalue_branch {} { ; #TRACE puts "[format %8d [incr count]] RDE si:valuevalue_branch"

	# i_error_pop_merge
	# i_ast_pop_discard
	# i:ok_loc_pop_discard
	# i:ok_return
	# i_ast_rewind
	# i_loc_rewind
	# i_error_push








>





>
>



|
>








570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596

		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}
	set mark [$mystackmark pop]
	if {$myok} {
	    $mystackloc pop
	    debug.pt/rdengine {[InstReturn]}
	    return -code return
	}
	$mystackast trim* $mark
	set myloc [$mystackloc peek]
	$mystackerr push {}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:valuevalue_branch {} {
	debug.pt/rdengine {[Instruction si:valuevalue_branch]}
	# i_error_pop_merge
	# i_ast_pop_discard
	# i:ok_loc_pop_discard
	# i:ok_return
	# i_ast_rewind
	# i_loc_rewind
	# i_error_push
︙︙
473
474
475
476
477
478
479


480
481
482
483
484


485
486
487
488
489
490

491
492
493
494
495
496
497

		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}
	if {$myok} {
	    $mystackmark pop
	    $mystackloc pop


	    return -code return
	}
	$mystackast trim* [$mystackmark peek]
	set myloc [$mystackloc peek]
	$mystackerr push {}


	return
    }

    # - -- --- ----- -------- ------------- ---------------------

    method si:voidvoid_part {} { ; #TRACE puts "[format %8d [incr count]] RDE si:voidvoid_part"

	# i_error_pop_merge
	# i:fail_loc_pop_rewind
	# i:fail_return
	# i_error_push

	set olderror [$mystackerr pop]
	# We have either old or new error data, keep it.








>
>





>
>





|
>








612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641

		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}
	if {$myok} {
	    $mystackmark pop
	    $mystackloc pop

	    debug.pt/rdengine {[InstReturn]}
	    return -code return
	}
	$mystackast trim* [$mystackmark peek]
	set myloc [$mystackloc peek]
	$mystackerr push {}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    # - -- --- ----- -------- ------------- ---------------------

    method si:voidvoid_part {} {
	debug.pt/rdengine {[Instruction si:voidvoid_part]}
	# i_error_pop_merge
	# i:fail_loc_pop_rewind
	# i:fail_return
	# i_error_push

	set olderror [$mystackerr pop]
	# We have either old or new error data, keep it.
︙︙
509
510
511
512
513
514
515

516
517
518


519
520
521
522

523
524
525
526
527
528
529

	    } elseif {$loe == $lon} {
		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}
	if {!$myok} {
	    set myloc [$mystackloc pop]

	    return -code return
	}
	$mystackerr push $myerror


	return
    }

    method si:voidvalue_part {} { ; #TRACE puts "[format %8d [incr count]] RDE si:voidvalue_part"

	# i_error_pop_merge
	# i:fail_loc_pop_rewind
	# i:fail_return
	# i_ast_push
	# i_error_push

	set olderror [$mystackerr pop]








>



>
>



|
>








653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677

	    } elseif {$loe == $lon} {
		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}
	if {!$myok} {
	    set myloc [$mystackloc pop]
	    debug.pt/rdengine {[InstReturn]}
	    return -code return
	}
	$mystackerr push $myerror

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:voidvalue_part {} {
	debug.pt/rdengine {[Instruction si:voidvalue_part]}
	# i_error_pop_merge
	# i:fail_loc_pop_rewind
	# i:fail_return
	# i_ast_push
	# i_error_push

	set olderror [$mystackerr pop]
︙︙
542
543
544
545
546
547
548

549
550
551
552


553
554
555
556

557
558
559
560
561
562
563

	    } elseif {$loe == $lon} {
		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}
	if {!$myok} {
	    set myloc [$mystackloc pop]

	    return -code return
	}
	$mystackmark push [$mystackast size]
	$mystackerr push $myerror


	return
    }

    method si:valuevalue_part {} { ; #TRACE puts "[format %8d [incr count]] RDE si:valuevalue_part"

	# i_error_pop_merge
	# i:fail_ast_pop_rewind
	# i:fail_loc_pop_rewind
	# i:fail_return
	# i_error_push

	set olderror [$mystackerr pop]








>




>
>



|
>








690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715

	    } elseif {$loe == $lon} {
		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}
	if {!$myok} {
	    set myloc [$mystackloc pop]
	    debug.pt/rdengine {[InstReturn]}
	    return -code return
	}
	$mystackmark push [$mystackast size]
	$mystackerr push $myerror

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:valuevalue_part {} {
	debug.pt/rdengine {[Instruction si:valuevalue_part]}
	# i_error_pop_merge
	# i:fail_ast_pop_rewind
	# i:fail_loc_pop_rewind
	# i:fail_return
	# i_error_push

	set olderror [$mystackerr pop]
︙︙
577
578
579
580
581
582
583


584
585
586


587
588
589
590
591
592

593
594
595
596
597
598
599
600
601
602
603
604

605
606
607
608
609
610
611

		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}
	if {!$myok} {
	    $mystackast trim* [$mystackmark pop]
	    set myloc [$mystackloc pop]


	    return -code return
	}
	$mystackerr push $myerror


	return
    }

    # - -- --- ----- -------- ------------- ---------------------

    method si:next_str {tok} { ; #TRACE puts "[format %8d [incr count]] RDE si:next_str ($tok)"

	# String = sequence of characters.
	# No need for all the intermediate stack churn.

	set n    [string length $tok]
	set last [expr {$myloc + $n}]
	set max  [string length $mytoken]

	incr myloc
	if {($last >= $max) && ![ExtendTCN [expr {$last - $max + 1}]]} {
	    set myok    0
	    set myerror [list $myloc [list [pt::pe str $tok]]]
	    # i:fail_return

	    return
	}
	set lex       [string range $mytoken $myloc $last]
	set mycurrent [string index $mytoken $last]

	# ATTENTION: The error output of this instruction is different
	# from a regular sequence of si:next_char instructions. The








>
>



>
>





|
>












>








729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769

		# Equal locations, merge the message lists, set-like.
		set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	    }
	}
	if {!$myok} {
	    $mystackast trim* [$mystackmark pop]
	    set myloc [$mystackloc pop]

	    debug.pt/rdengine {[InstReturn]}
	    return -code return
	}
	$mystackerr push $myerror

	debug.pt/rdengine {[InstReturn]}
	return
    }

    # - -- --- ----- -------- ------------- ---------------------

    method si:next_str {tok} {
	debug.pt/rdengine {[Instruction si:next_str $tok]}
	# String = sequence of characters.
	# No need for all the intermediate stack churn.

	set n    [string length $tok]
	set last [expr {$myloc + $n}]
	set max  [string length $mytoken]

	incr myloc
	if {($last >= $max) && ![ExtendTCN [expr {$last - $max + 1}]]} {
	    set myok    0
	    set myerror [list $myloc [list [pt::pe str $tok]]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set lex       [string range $mytoken $myloc $last]
	set mycurrent [string index $mytoken $last]

	# ATTENTION: The error output of this instruction is different
	# from a regular sequence of si:next_char instructions. The
︙︙
620
621
622
623
624
625
626

627
628
629
630

631
632
633
634
635
636
637
638
639
640
641

642
643
644
645
646
647
648
649
650
651
652
653
654
655
656

657
658
659
660

661
662
663
664
665
666
667
668
669

670
671
672
673
674
675
676
677
678
679
680

681
682
683
684

685
686
687
688
689
690
691
692
693

694
695
696
697
698
699
700
701
702
703
704
705
706
707

708
709
710
711
712
713

714
715
716
717
718
719
720
721
722

723
724
725
726
727
728
729
730
731
732
733

734
735
736
737

738
739
740
741
742
743
744
745
746

747
748
749
750
751
752
753
754
755
756
757

758
759
760
761

762
763
764
765
766
767
768
769
770

771
772
773
774
775
776
777
778
779
780
781

782
783
784
785

786
787
788
789
790
791
792
793
794

795
796
797
798
799
800
801
802
803
804
805

806
807
808
809

810
811
812
813
814
815
816
817
818

819
820
821
822
823
824
825
826
827
828
829

830
831
832
833

834
835
836
837
838
839
840
841
842

843
844
845
846
847
848
849
850
851
852
853

854
855
856
857

858
859
860
861
862
863
864
865
866

867
868
869
870
871
872
873
874
875
876
877

878
879
880
881

882
883
884
885
886
887
888
889
890

891
892
893
894
895
896
897
898
899
900
901

902
903
904
905

906
907
908
909
910
911
912
913
914

915
916
917
918
919
920
921
922
923
924
925

926
927
928
929

930
931
932
933
934
935
936
937
938

939
940
941
942
943
944
945
946
947
948
949

950
951
952
953

954
955
956
957
958
959
960
961
962

963
964
965
966
967
968
969
970
971
972
973

974
975
976
977

978
979
980
981
982
983
984
985
986

987
988
989
990
991
992
993
994
995
996
997

998
999
1000
1001

1002
1003
1004
1005
1006
1007
1008
1009
1010

1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021

1022
1023
1024
1025

1026
1027
1028
1029
1030
1031
1032
1033
1034

1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045

1046
1047
1048
1049
1050
1051

1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063

1064
1065
1066
1067


1068
1069
1070
1071

1072
1073
1074
1075
1076
1077
1078
1079

1080
1081
1082
1083


1084
1085
1086
1087

1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098

1099
1100
1101


1102
1103
1104
1105

1106
1107
1108
1109
1110
1111
1112

1113
1114
1115


1116
1117
1118
1119

1120
1121
1122
1123
1124
1125
1126

	if {$myok} {
	    set myloc $last
	    set myerror {}
	} else {
	    set myerror [list $myloc [list [pt::pe str $tok]]]
	    incr myloc -1
	}

	return
    }

    method si:next_class {tok} { ; #TRACE puts "[format %8d [incr count]] RDE si:next_class ($tok)"

	# Class = Choice of characters. No need for stack churn.

	# i_input_next "\{t $c\}"
	# i:fail_return
	# i_test_<user class>

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list [pt::pe class $tok]]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	# Note what is needle versus hay. The token, i.e. the string
	# of allowed characters is the hay in which the current
	# character is looked, making it the needle.
	set myok [expr {[string first $mycurrent $tok] >= 0}]

	if {$myok} {
	    set myerror {}
	} else {
	    set myerror [list $myloc [list [pt::pe class $tok]]]
	    incr myloc -1
	}

	return
    }

    method si:next_char {tok} { ; #TRACE puts "[format %8d [incr count]] RDE si:next_char ($tok)"

	# i_input_next "\{t $c\}"
	# i:fail_return
	# i_test_char $c

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list [pt::pe terminal $tok]]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [expr {$tok eq $mycurrent}]
	if {$myok} {
	    set myerror {}
	} else {
	    set myerror [list $myloc [list [pt::pe terminal $tok]]]
	    incr myloc -1
	}

	return
    }

    method si:next_range {toks toke} { ; #TRACE puts "[format %8d [incr count]] RDE si:next_range ($toks $toke)"

	#Asm::Ins i_input_next "\{.. $s $e\}"
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_range $s $e

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list [pt::pe range $toks $toke]]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [expr {
			([string compare $toks $mycurrent] <= 0) &&
			([string compare $mycurrent $toke] <= 0)
		    }] ; # {}
	if {$myok} {
	    set myerror {}
	} else {
	    set myerror [list $myloc [list [pt::pe range $toks $toke]]]
	    incr myloc -1
	}

	return
    }

    # - -- --- ----- -------- ------------- ---------------------

    method si:next_alnum {} { ; #TRACE puts "[format %8d [incr count]] RDE si:next_alnum"

	#Asm::Ins i_input_next alnum
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_alnum

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list alnum]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is alnum -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list alnum]]
	    incr myloc -1
	} else {
	    set myerror {}
	}

	return
    }

    method si:next_alpha {} { ; #TRACE puts "[format %8d [incr count]] RDE si:next_alpha"

	#Asm::Ins i_input_next alpha
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_alpha

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list alpha]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is alpha -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list alpha]]
	    incr myloc -1
	} else {
	    set myerror {}
	}

	return
    }

    method si:next_ascii {} { ; #TRACE puts "[format %8d [incr count]] RDE si:next_ascii"

	#Asm::Ins i_input_next ascii
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_ascii

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list ascii]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is ascii -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list ascii]]
	    incr myloc -1
	} else {
	    set myerror {}
	}

	return
    }

    method si:next_control {} { ; #TRACE puts "[format %8d [incr count]] RDE si:next_control"

	#Asm::Ins i_input_next control
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_control

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list control]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is control -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list control]]
	    incr myloc -1
	} else {
	    set myerror {}
	}

	return
    }

    method si:next_ddigit {} { ; #TRACE puts "[format %8d [incr count]] RDE si:next_ddigit"

	#Asm::Ins i_input_next ddigit
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_ddigit

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list ddigit]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string match {[0-9]} $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list ddigit]]
	    incr myloc -1
	} else {
	    set myerror {}
	}

	return
    }

    method si:next_digit {} { ; #TRACE puts "[format %8d [incr count]] RDE si:next_digit"

	#Asm::Ins i_input_next digit
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_digit

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list digit]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is digit -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list digit]]
	    incr myloc -1
	} else {
	    set myerror {}
	}

	return
    }

    method si:next_graph {} { ; #TRACE puts "[format %8d [incr count]] RDE si:next_graph"

	#Asm::Ins i_input_next graph
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_graph

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list graph]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is graph -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list graph]]
	    incr myloc -1
	} else {
	    set myerror {}
	}

	return
    }

    method si:next_lower {} { ; #TRACE puts "[format %8d [incr count]] RDE si:next_lower"

	#Asm::Ins i_input_next lower
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_lower

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list lower]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is lower -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list lower]]
	    incr myloc -1
	} else {
	    set myerror {}
	}

	return
    }

    method si:next_print {} { ; #TRACE puts "[format %8d [incr count]] RDE si:next_print"

	#Asm::Ins i_input_next print
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_print

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list print]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is print -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list print]]
	    incr myloc -1
	} else {
	    set myerror {}
	}

	return
    }

    method si:next_punct {} { ; #TRACE puts "[format %8d [incr count]] RDE si:next_punct"

	#Asm::Ins i_input_next punct
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_punct

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list punct]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is punct -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list punct]]
	    incr myloc -1
	} else {
	    set myerror {}
	}

	return
    }

    method si:next_space {} { ; #TRACE puts "[format %8d [incr count]] RDE si:next_space"

	#Asm::Ins i_input_next space
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_space

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list space]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is space -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list space]]
	    incr myloc -1
	} else {
	    set myerror {}
	}

	return
    }

    method si:next_upper {} { ; #TRACE puts "[format %8d [incr count]] RDE si:next_upper"

	#Asm::Ins i_input_next upper
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_upper

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list upper]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is upper -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list upper]]
	    incr myloc -1
	} else {
	    set myerror {}
	}

	return
    }

    method si:next_wordchar {} { ; #TRACE puts "[format %8d [incr count]] RDE si:next_wordchar"

	#Asm::Ins i_input_next wordchar
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_wordchar

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list wordchar]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is wordchar -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list wordchar]]
	    incr myloc -1
	} else {
	    set myerror {}
	}

	return
    }

    method si:next_xdigit {} { ; #TRACE puts "[format %8d [incr count]] RDE si:next_xdigit"

	#Asm::Ins i_input_next xdigit
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_xdigit

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list xdigit]]
	    # i:fail_return

	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is xdigit -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list xdigit]]
	    incr myloc -1
	} else {
	    set myerror {}
	}

	return
    }

    # - -- --- ----- -------- ------------- ---------------------

    method si:value_symbol_start {symbol} { ; #TRACE puts "[format %8d [incr count]] RDE si:value_symbol_start ($symbol)"

	# if @runtime@ i_symbol_restore $symbol
	# i:found:ok_ast_value_push
	# i:found_return
	# i_loc_push
	# i_ast_push

	set k [list $myloc $symbol]
	if {[info exists mysymbol($k)]} { 
	    lassign $mysymbol($k) myloc myok myerror mysvalue
	    if {$myok} {
		$mystackast push $mysvalue
	    }

	    return -code return
	}
	$mystackloc  push $myloc
	$mystackmark push [$mystackast size]


	return
    }

    method si:value_void_symbol_start {symbol} { ; #TRACE puts "[format %8d [incr count]] RDE si:value_void_symbol_start ($symbol)"

	# if @runtime@ i_symbol_restore $symbol
	# i:found_return
	# i_loc_push
	# i_ast_push

	set k [list $myloc $symbol]
	if {[info exists mysymbol($k)]} { 
	    lassign $mysymbol($k) myloc myok myerror mysvalue

	    return -code return
	}
	$mystackloc  push $myloc
	$mystackmark push [$mystackast size]


	return
    }

    method si:void_symbol_start {symbol} { ; #TRACE puts "[format %8d [incr count]] RDE si:void_symbol_start ($symbol)"

	# if @runtime@ i_symbol_restore $symbol
	# i:found:ok_ast_value_push
	# i:found_return
	# i_loc_push

	set k [list $myloc $symbol]
	if {[info exists mysymbol($k)]} { 
	    lassign $mysymbol($k) myloc myok myerror mysvalue
	    if {$myok} {
		$mystackast push $mysvalue
	    }

	    return -code return
	}
	$mystackloc push $myloc


	return
    }

    method si:void_void_symbol_start {symbol} { ; #TRACE puts "[format %8d [incr count]] RDE si:void_void_symbol_start ($symbol)"

	# if @runtime@ i_symbol_restore $symbol
	# i:found_return
	# i_loc_push

	set k [list $myloc $symbol]
	if {[info exists mysymbol($k)]} { 
	    lassign $mysymbol($k) myloc myok myerror mysvalue

	    return -code return
	}
	$mystackloc push $myloc


	return
    }

    method si:reduce_symbol_end {symbol} { ; #TRACE puts "[format %8d [incr count]] RDE si:reduce_symbol_end ($symbol)"

	# i_value_clear/reduce $symbol
	# i_symbol_save       $symbol
	# i_error_nonterminal $symbol
	# i_ast_pop_rewind
	# i_loc_pop_discard
	# i:ok_ast_value_push









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	if {$myok} {
	    set myloc $last
	    set myerror {}
	} else {
	    set myerror [list $myloc [list [pt::pe str $tok]]]
	    incr myloc -1
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:next_class {tok} {
	debug.pt/rdengine {[Instruction si:next_class $tok]}
	# Class = Choice of characters. No need for stack churn.

	# i_input_next "\{t $c\}"
	# i:fail_return
	# i_test_<user class>

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list [pt::pe class $tok]]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	# Note what is needle versus hay. The token, i.e. the string
	# of allowed characters is the hay in which the current
	# character is looked, making it the needle.
	set myok [expr {[string first $mycurrent $tok] >= 0}]

	if {$myok} {
	    set myerror {}
	} else {
	    set myerror [list $myloc [list [pt::pe class $tok]]]
	    incr myloc -1
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:next_char {tok} {
	debug.pt/rdengine {[Instruction si:next_char $tok]}
	# i_input_next "\{t $c\}"
	# i:fail_return
	# i_test_char $c

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list [pt::pe terminal $tok]]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [expr {$tok eq $mycurrent}]
	if {$myok} {
	    set myerror {}
	} else {
	    set myerror [list $myloc [list [pt::pe terminal $tok]]]
	    incr myloc -1
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:next_range {toks toke} {
	debug.pt/rdengine {[Instruction si:next_range $toks $toke]}
	#Asm::Ins i_input_next "\{.. $s $e\}"
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_range $s $e

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list [pt::pe range $toks $toke]]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [expr {
			([string compare $toks $mycurrent] <= 0) &&
			([string compare $mycurrent $toke] <= 0)
		    }] ; # {}
	if {$myok} {
	    set myerror {}
	} else {
	    set myerror [list $myloc [list [pt::pe range $toks $toke]]]
	    incr myloc -1
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    # - -- --- ----- -------- ------------- ---------------------

    method si:next_alnum {} {
	debug.pt/rdengine {[Instruction si:next_alnum]}
	#Asm::Ins i_input_next alnum
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_alnum

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list alnum]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is alnum -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list alnum]]
	    incr myloc -1
	} else {
	    set myerror {}
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:next_alpha {} {
	debug.pt/rdengine {[Instruction si:next_alpha]}
	#Asm::Ins i_input_next alpha
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_alpha

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list alpha]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is alpha -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list alpha]]
	    incr myloc -1
	} else {
	    set myerror {}
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:next_ascii {} {
	debug.pt/rdengine {[Instruction si:next_ascii]}
	#Asm::Ins i_input_next ascii
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_ascii

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list ascii]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is ascii -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list ascii]]
	    incr myloc -1
	} else {
	    set myerror {}
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:next_control {} {
	debug.pt/rdengine {[Instruction si:next_control]}
	#Asm::Ins i_input_next control
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_control

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list control]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is control -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list control]]
	    incr myloc -1
	} else {
	    set myerror {}
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:next_ddigit {} {
	debug.pt/rdengine {[Instruction si:next_ddigit]}
	#Asm::Ins i_input_next ddigit
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_ddigit

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list ddigit]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string match {[0-9]} $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list ddigit]]
	    incr myloc -1
	} else {
	    set myerror {}
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:next_digit {} {
	debug.pt/rdengine {[Instruction si:next_digit]}
	#Asm::Ins i_input_next digit
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_digit

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list digit]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is digit -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list digit]]
	    incr myloc -1
	} else {
	    set myerror {}
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:next_graph {} {
	debug.pt/rdengine {[Instruction si:next_graph]}
	#Asm::Ins i_input_next graph
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_graph

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list graph]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is graph -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list graph]]
	    incr myloc -1
	} else {
	    set myerror {}
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:next_lower {} {
	debug.pt/rdengine {[Instruction si:next_lower]}
	#Asm::Ins i_input_next lower
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_lower

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list lower]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is lower -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list lower]]
	    incr myloc -1
	} else {
	    set myerror {}
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:next_print {} {
	debug.pt/rdengine {[Instruction si:next_print]}
	#Asm::Ins i_input_next print
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_print

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list print]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is print -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list print]]
	    incr myloc -1
	} else {
	    set myerror {}
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:next_punct {} {
	debug.pt/rdengine {[Instruction si:next_punct]}
	#Asm::Ins i_input_next punct
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_punct

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list punct]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is punct -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list punct]]
	    incr myloc -1
	} else {
	    set myerror {}
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:next_space {} {
	debug.pt/rdengine {[Instruction si:next_space]}
	#Asm::Ins i_input_next space
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_space

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list space]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is space -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list space]]
	    incr myloc -1
	} else {
	    set myerror {}
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:next_upper {} {
	debug.pt/rdengine {[Instruction si:next_upper]}
	#Asm::Ins i_input_next upper
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_upper

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list upper]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is upper -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list upper]]
	    incr myloc -1
	} else {
	    set myerror {}
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:next_wordchar {} {
	debug.pt/rdengine {[Instruction si:next_wordchar]}
	#Asm::Ins i_input_next wordchar
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_wordchar

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list wordchar]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is wordchar -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list wordchar]]
	    incr myloc -1
	} else {
	    set myerror {}
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:next_xdigit {} {
	debug.pt/rdengine {[Instruction si:next_xdigit]}
	#Asm::Ins i_input_next xdigit
	#Asm::Ins i:fail_return
	#Asm::Ins i_test_xdigit

	incr myloc
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list xdigit]]
	    # i:fail_return
	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok [string is xdigit -strict $mycurrent]
	if {!$myok} {
	    set myerror [list $myloc [list xdigit]]
	    incr myloc -1
	} else {
	    set myerror {}
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    # - -- --- ----- -------- ------------- ---------------------

    method si:value_symbol_start {symbol} {
	debug.pt/rdengine {[Instruction si:value_symbol_start $symbol]}
	# if @runtime@ i_symbol_restore $symbol
	# i:found:ok_ast_value_push
	# i:found_return
	# i_loc_push
	# i_ast_push

	set k [list $myloc $symbol]
	if {[info exists mysymbol($k)]} { 
	    lassign $mysymbol($k) myloc myok myerror mysvalue
	    if {$myok} {
		$mystackast push $mysvalue
	    }
	    debug.pt/rdengine {[InstReturn]}
	    return -code return
	}
	$mystackloc  push $myloc
	$mystackmark push [$mystackast size]

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:value_void_symbol_start {symbol} {
	debug.pt/rdengine {[Instruction si:value_void_symbol_start $symbol]}
	# if @runtime@ i_symbol_restore $symbol
	# i:found_return
	# i_loc_push
	# i_ast_push

	set k [list $myloc $symbol]
	if {[info exists mysymbol($k)]} { 
	    lassign $mysymbol($k) myloc myok myerror mysvalue
	    debug.pt/rdengine {[InstReturn]}
	    return -code return
	}
	$mystackloc  push $myloc
	$mystackmark push [$mystackast size]

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:void_symbol_start {symbol} {
	debug.pt/rdengine {[Instruction si:void_symbol_start $symbol]}
	# if @runtime@ i_symbol_restore $symbol
	# i:found:ok_ast_value_push
	# i:found_return
	# i_loc_push

	set k [list $myloc $symbol]
	if {[info exists mysymbol($k)]} { 
	    lassign $mysymbol($k) myloc myok myerror mysvalue
	    if {$myok} {
		$mystackast push $mysvalue
	    }
	    debug.pt/rdengine {[InstReturn]}
	    return -code return
	}
	$mystackloc push $myloc

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:void_void_symbol_start {symbol} {
	debug.pt/rdengine {[Instruction si:void_void_symbol_start $symbol]}
	# if @runtime@ i_symbol_restore $symbol
	# i:found_return
	# i_loc_push

	set k [list $myloc $symbol]
	if {[info exists mysymbol($k)]} { 
	    lassign $mysymbol($k) myloc myok myerror mysvalue
	    debug.pt/rdengine {[InstReturn]}
	    return -code return
	}
	$mystackloc push $myloc

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:reduce_symbol_end {symbol} {
	debug.pt/rdengine {[Instruction si:reduce_symbol_end $symbol]}
	# i_value_clear/reduce $symbol
	# i_symbol_save       $symbol
	# i_error_nonterminal $symbol
	# i_ast_pop_rewind
	# i_loc_pop_discard
	# i:ok_ast_value_push
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	    }
	}}

	$mystackast trim* [$mystackmark pop]
	if {$myok} {
	    $mystackast push $mysvalue
	}

	return
    }

    method si:void_leaf_symbol_end {symbol} { ; #TRACE puts "[format %8d [incr count]] RDE si:void_leaf_symbol_end ($symbol)"

	# i_value_clear/leaf $symbol
	# i_symbol_save       $symbol
	# i_error_nonterminal $symbol
	# i_loc_pop_discard
	# i:ok_ast_value_push

	set mysvalue {}








>



|
>








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	    }
	}}

	$mystackast trim* [$mystackmark pop]
	if {$myok} {
	    $mystackast push $mysvalue
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:void_leaf_symbol_end {symbol} {
	debug.pt/rdengine {[Instruction si:void_leaf_symbol_end $symbol]}
	# i_value_clear/leaf $symbol
	# i_symbol_save       $symbol
	# i_error_nonterminal $symbol
	# i_loc_pop_discard
	# i:ok_ast_value_push

	set mysvalue {}
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		set myerror [list $loc [list [list n $symbol]]]
	    }
	}}

	if {$myok} {
	    $mystackast push $mysvalue
	}


	return
    }

    method si:value_leaf_symbol_end {symbol} { ; #TRACE puts "[format %8d [incr count]] RDE si:value_leaf_symbol_end ($symbol)"

	# i_value_clear/leaf $symbol
	# i_symbol_save       $symbol
	# i_error_nonterminal $symbol
	# i_loc_pop_discard
	# i_ast_pop_rewind
	# i:ok_ast_value_push









>
>



|
>








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		set myerror [list $loc [list [list n $symbol]]]
	    }
	}}

	if {$myok} {
	    $mystackast push $mysvalue
	}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:value_leaf_symbol_end {symbol} {
	debug.pt/rdengine {[Instruction si:value_leaf_symbol_end $symbol]}
	# i_value_clear/leaf $symbol
	# i_symbol_save       $symbol
	# i_error_nonterminal $symbol
	# i_loc_pop_discard
	# i_ast_pop_rewind
	# i:ok_ast_value_push
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	    }
	}}

	$mystackast trim* [$mystackmark pop]
	if {$myok} {
	    $mystackast push $mysvalue
	}


	return
    }

    method si:value_clear_symbol_end {symbol} { ; #TRACE puts "[format %8d [incr count]] RDE si:value_clear_symbol_end ($symbol)"

	# i_value_clear
	# i_symbol_save       $symbol
	# i_error_nonterminal $symbol
	# i_loc_pop_discard
	# i_ast_pop_rewind

	set mysvalue {}








>
>



|
>








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	    }
	}}

	$mystackast trim* [$mystackmark pop]
	if {$myok} {
	    $mystackast push $mysvalue
	}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:value_clear_symbol_end {symbol} {
	debug.pt/rdengine {[Instruction si:value_clear_symbol_end $symbol]}
	# i_value_clear
	# i_symbol_save       $symbol
	# i_error_nonterminal $symbol
	# i_loc_pop_discard
	# i_ast_pop_rewind

	set mysvalue {}
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	    lassign $myerror loc messages
	    if {$loc == $pos} {
		set myerror [list $loc [list [list n $symbol]]]
	    }
	}}

	$mystackast trim* [$mystackmark pop]

	return
    }

    method si:void_clear_symbol_end {symbol} { ; #TRACE puts "[format %8d [incr count]] RDE si:void_clear_symbol_end ($symbol)"

	# i_value_clear
	# i_symbol_save       $symbol
	# i_error_nonterminal $symbol
	# i_loc_pop_discard

	set mysvalue {}
	set at [$mystackloc pop]

	set k  [list $at $symbol]
	set mysymbol($k) [list $myloc $myok $myerror $mysvalue]

	# si:void_clear_symbol_end / i_error_nonterminal -- inlined -- disabled
	if {0} {if {[llength $myerror]} {
	    set  pos $at
	    incr pos
	    lassign $myerror loc messages
	    if {$loc == $pos} {
		set myerror [list $loc [list [list n $symbol]]]
	    }
	}}

	return
    }

    # # ## ### ##### ######## ############# #####################
    ## API - Instructions - Control flow

    method i:ok_continue {} { ; #TRACE puts "[format %8d [incr count]] RDE i:ok_continue"

	if {!$myok} return
	return -code continue
    }

    method i:fail_continue {} { ; #TRACE puts "[format %8d [incr count]] RDE i:fail_continue"

	if {$myok} return
	return -code continue
    }

    method i:fail_return {} { ; #TRACE puts "[format %8d [incr count]] RDE i:fail_return"

	if {$myok} return
	return -code return
    }

    method i:ok_return {} { ; #TRACE puts "[format %8d [incr count]] RDE i:ok_return"

	if {!$myok} return
	return -code return
    }

    # # ## ### ##### ######## ############# #####################
    ##  API - Instructions - Unconditional matching.

    method i_status_ok {} { ; #TRACE puts "[format %8d [incr count]] RDE i_status_ok"

	set myok 1

	return
    }

    method i_status_fail {} { ; #TRACE puts "[format %8d [incr count]] RDE i_status_fail"

	set myok 0

	return
    }

    method i_status_negate {} { ; #TRACE puts "[format %8d [incr count]] RDE i_status_negate"

	set myok [expr {!$myok}]

	return
    }

    # # ## ### ##### ######## ############# #####################
    ##  API - Instructions - Error handling.

    method i_error_clear {} { ; #TRACE puts "[format %8d [incr count]] RDE i_error_clear"

	set myerror {}

	return
    }

    method i_error_push {} { ; #TRACE puts "[format %8d [incr count]] RDE i_error_push ($myerror)"

	$mystackerr push $myerror

	return
    }

    method i_error_clear_push {} { ; #TRACE puts "[format %8d [incr count]] RDE i_error_clear_push ()"

	set myerror {}
	$mystackerr push {}

	return
    }

    method i_error_pop_merge {} { ; #TRACE puts "[format %8d [incr count]] RDE i_error_pop_merge ($myerror)-/-([$mystackerr peek])"

	set olderror [$mystackerr pop]

	# We have either old or new error data, keep it.

	if {![llength $myerror]}  { set myerror $olderror ; return }
	if {![llength $olderror]} return

	# If one of the errors is further on in the input choose that as
	# the information to propagate.

	lassign $myerror  loe msgse
	lassign $olderror lon msgsn

	if {$lon > $loe} { set myerror $olderror ; return }
	if {$loe > $lon} return

	# Equal locations, merge the message lists, set-like.
	set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]

	return
    }

    method i_error_nonterminal {symbol} { ; #TRACE puts "[format %8d [incr count]] RDE i_error_nonterminal ($symbol)"

	#  i_error_nonterminal -- Disabled. Generate only low-level
	#  i_error_nonterminal -- errors until we have worked out how
	#  i_error_nonterminal -- to integrate symbol information with
	#  i_error_nonterminal -- them. Do not forget where this
	#  i_error_nonterminal -- instruction is inlined.
	return

	# Inlined: Errors, Expected.
	if {![llength $myerror]} {
	    #TRACE puts "[format %8d $count] RDE i_error_nonterminal ($symbol) no error"
	    return
	}
	set pos [$mystackloc peek]
	incr pos
	lassign $myerror loc messages
	if {$loc != $pos} {
	    #TRACE puts "[format %8d $count] RDE i_error_nonterminal ($symbol) -- $myerror != $pos"
	    return
	}
	set myerror [list $loc [list [list n $symbol]]]
	TRACE puts "[format %8d $count] RDE i_error_nonterminal ($symbol) := $myerror"

	return
    }

    # # ## ### ##### ######## ############# #####################
    ##  API - Instructions - Basic input handling and tracking

    method i_loc_pop_rewind/discard {} { ; #TRACE puts "[format %8d [incr count]] RDE i_loc_pop_rewind/discard (ok $myok ([expr {$myok ? "keep $myloc drop" : "back@"}] [$mystackloc peek]))"

	#$myparser i:fail_loc_pop_rewind
	#$myparser i:ok_loc_pop_discard
	#return
	set last [$mystackloc pop]
	if {$myok} return
	set myloc $last


	return
    }

    method i_loc_pop_discard {} { ; #TRACE puts "[format %8d [incr count]] RDE i_loc_pop_discard"

	$mystackloc pop

	return
    }

    method i:ok_loc_pop_discard {} { ; #TRACE puts "[format %8d [incr count]] RDE i:ok_loc_pop_discard"

	if {!$myok} return
	$mystackloc pop


	return
    }



    method i_loc_pop_rewind {} { ; #TRACE puts "[format %8d [incr count]] RDE i_loc_pop_rewind"
	set myloc [$mystackloc pop]

	return
    }

    method i:fail_loc_pop_rewind {} { ; #TRACE puts "[format %8d [incr count]] RDE i:fail_loc_pop_rewind"

	if {$myok} return
	set myloc [$mystackloc pop]


	return
    }

    method i_loc_push {} { ; #TRACE puts "[format %8d [incr count]] RDE i_loc_push (saving @$myloc)"

	$mystackloc push $myloc

	return
    }

    method i_loc_rewind {} { ; #TRACE puts "[format %8d [incr count]] RDE i_loc_rewind"

	# i_loc_pop_rewind - set myloc [$mystackloc pop]
	# i_loc_push       - $mystackloc push $myloc    

	set myloc [$mystackloc peek]

	return
    }

    # # ## ### ##### ######## ############# #####################
    ##  API - Instructions - AST stack handling

    method i_ast_pop_rewind/discard {} { ; #TRACE puts "[format %8d [incr count]] RDE i_ast_pop_rewind/discard"

	#$myparser i:fail_ast_pop_rewind
	#$myparser i:ok_ast_pop_discard
	#return
	set mark [$mystackmark pop]
	if {$myok} return
	$mystackast trim* $mark



	return
    }

    method i_ast_pop_discard/rewind {} { ; #TRACE puts "[format %8d [incr count]] RDE i_ast_pop_discard/rewind"

	#$myparser i:ok_ast_pop_rewind
	#$myparser i:fail_ast_pop_discard
	#return
	set mark [$mystackmark pop]
	if {!$myok} return
	$mystackast trim* $mark



	return
    }

    method i_ast_pop_discard {} { ; #TRACE puts "[format %8d [incr count]] RDE i_ast_pop_discard"

	$mystackmark pop


	return
    }

    method i:ok_ast_pop_discard {} { ; #TRACE puts "[format %8d [incr count]] RDE i:ok_ast_pop_discard"

	if {!$myok} return
	$mystackmark pop



	return
    }

    method i_ast_pop_rewind {} { ; #TRACE puts "[format %8d [incr count]] RDE i_ast_pop_rewind"

	$mystackast trim* [$mystackmark pop]


	return
    }

    method i:fail_ast_pop_rewind {} { ; #TRACE puts "[format %8d [incr count]] RDE i:fail_ast_pop_rewind"

	if {$myok} return
	$mystackast trim* [$mystackmark pop]



	return
    }

    method i_ast_push {} { ; #TRACE puts "[format %8d [incr count]] RDE i_ast_push"

	$mystackmark push [$mystackast size]


	return
    }

    method i:ok_ast_value_push {} { ; #TRACE puts "[format %8d [incr count]] RDE i:ok_ast_value_push"

	if {!$myok} return
	$mystackast push $mysvalue



	return
    }

    method i_ast_rewind {} { ; #TRACE puts "[format %8d [incr count]] RDE i_ast_rewind"

	# i_ast_pop_rewind - $mystackast  trim* [$mystackmark pop]
	# i_ast_push       - $mystackmark push [$mystackast size]

	$mystackast trim* [$mystackmark peek]


	return
    }

    # # ## ### ##### ######## ############# #####################
    ## API - Instructions - Nonterminal cache

    method i_symbol_restore {symbol} { ; #TRACE puts "[format %8d [incr count]] RDE i_symbol_restore ($symbol)"

	# Satisfy from cache if possible.
	set k [list $myloc $symbol]
	if {![info exists mysymbol($k)]} { return 0 }



	lassign $mysymbol($k) myloc myok myerror mysvalue
	# We go forward, as the nonterminal matches (or not).

	return 1
    }

    method i_symbol_save {symbol} { ; #TRACE puts "[format %8d [incr count]] RDE i_symbol_save ($symbol)"

	# Store not only the value, but also how far
	# the match went (if it was a match).
	set at [$mystackloc peek]
	set k  [list $at $symbol]
	set mysymbol($k) [list $myloc $myok $myerror $mysvalue]


	return
    }

    # # ## ### ##### ######## ############# #####################
    ##  API - Instructions - Semantic values.

    method i_value_clear {} { ; #TRACE puts "[format %8d [incr count]] RDE i_value_clear"

	set mysvalue {}


	return
    }

    method i_value_clear/leaf {symbol} { ; #TRACE puts "[format %8d [incr count]] RDE i_value_clear/leaf ($symbol ok $myok ([expr {[$mystackloc peek]+1}])-@$myloc)"


	# not quite value_lead (guarded, and clear on fail)
	# Inlined clear, reduce, and optimized.
	# Clear ; if {$ok} {Reduce $symbol}
	set mysvalue {}
	if {!$myok} return
	set  pos [$mystackloc peek]
	incr pos

	if {($pos - 1) == $myloc} {
	    # The symbol did not process any input. As this is
	    # signaled to be ok (*) we create a node covering an empty
	    # range. (Ad *): Can happen for a RHS using toplevel
	    # operators * or ?.
	    set mysvalue [pt::ast new0 $symbol $pos]
	} else {
	    set mysvalue [pt::ast new $symbol $pos $myloc]
	}



	return
    }

    method i_value_clear/reduce {symbol} { ; #TRACE puts "[format %8d [incr count]] RDE i_value_clear/reduce ($symbol)"

	set mysvalue {}
	if {!$myok} return

	set  mark [$mystackmark peek];# Old size of stack before current nt pushed more.
	set  newa [expr {[$mystackast size] - $mark}]

	set  pos  [$mystackloc  peek]
	incr pos

	if {!$newa} {
	    set mysvalue {}
	} elseif {$newa == 1} {
	    # peek 1 => single element comes back
	    set mysvalue [list [$mystackast peek]]     ; # SaveToMark
	} else {
	    # peek n > 1 => list of elements comes back
	    set mysvalue [$mystackast peekr $newa]     ; # SaveToMark
	}

	if {($pos - 1) == $myloc} {
	    # The symbol did not process any input. As this is
	    # signaled to be ok (*) we create a node covering an empty
	    # range. (Ad *): Can happen for a RHS using toplevel
	    # operators * or ?.
	    set mysvalue [pt::ast new0 $symbol $pos {*}$mysvalue]
	} else {
	    set mysvalue [pt::ast new $symbol $pos $myloc {*}$mysvalue] ; # Reduce $symbol
	}



	return
    }

    # # ## ### ##### ######## ############# #####################
    ## API - Instructions - Terminal matching

    method i_input_next {msg} { ; #TRACE puts "[format %8d [incr count]] RDE i_input_next ($msg)"

	# Inlined: Getch, Expected, ClearErrors
	# Satisfy from input cache if possible.

	incr myloc
	# May read from the input (ExtendTC), and remember the
	# information. Note: We are implicitly incrementing the
	# location!
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list $msg]]


	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok    1
	set myerror {}


	return
    }


    method i_test_char {tok} { ; #TRACE puts "[format %8d [incr count]] RDE i_test_char (ok [expr {$tok eq $mycurrent}], [expr {$tok eq $mycurrent ? "@$myloc" : "back@[expr {$myloc-1}]"}])"
	set myok [expr {$tok eq $mycurrent}]
	if {$myok} {
	    set myerror {}
	} else {
	    set myerror [list $myloc [list [pt::pe terminal $tok]]]
	    incr myloc -1
	}

	return
    }

    method i_test_range {toks toke} { ; #TRACE puts "[format %8d [incr count]] RDE i_test_range ($toks $toke)"

	set myok [expr {
			([string compare $toks $mycurrent] <= 0) &&
			([string compare $mycurrent $toke] <= 0)
		    }] ; # {}
	if {$myok} {
	    set myerror {}
	} else {
	    set myerror [list $myloc [list [pt::pe range $toks $toke]]]
	    incr myloc -1
	}

	return
    }

    method i_test_alnum {} { ; #TRACE puts "[format %8d [incr count]] RDE i_test_alnum"

	set myok [string is alnum -strict $mycurrent]
	OkFail alnum


	return
    }

    method i_test_alpha {} { ; #TRACE puts "[format %8d [incr count]] RDE i_test_alpha"

	set myok [string is alpha -strict $mycurrent]
	OkFail alpha


	return
    }

    method i_test_ascii {} { ; #TRACE puts "[format %8d [incr count]] RDE i_test_ascii"

	set myok [string is ascii -strict $mycurrent]
	OkFail ascii


	return

    }

    method i_test_control {} { ; #TRACE puts "[format %8d [incr count]] RDE i_test_control"

	set myok [string is control -strict $mycurrent]
	OkFail control


	return
    }

    method i_test_ddigit {} { ; #TRACE puts "[format %8d [incr count]] RDE i_test_ddigit"

	set myok [string match {[0-9]} $mycurrent]
	OkFail ddigit


	return
    }

    method i_test_digit {} { ; #TRACE puts "[format %8d [incr count]] RDE i_test_digit"

	set myok [string is digit -strict $mycurrent]
	OkFail digit


	return
    }

    method i_test_graph {} { ; #TRACE puts "[format %8d [incr count]] RDE i_test_graph"

	set myok [string is graph -strict $mycurrent]
	OkFail graph
	return
    }




    method i_test_lower {} { ; #TRACE puts "[format %8d [incr count]] RDE i_test_lower"

	set myok [string is lower -strict $mycurrent]
	OkFail lower


	return
    }

    method i_test_print {} { ; #TRACE puts "[format %8d [incr count]] RDE i_test_print"

	set myok [string is print -strict $mycurrent]
	OkFail print


	return
    }

    method i_test_punct {} { ; #TRACE puts "[format %8d [incr count]] RDE i_test_punct"

	set myok [string is punct -strict $mycurrent]
	OkFail punct


	return
    }

    method i_test_space {} { ; #TRACE puts "[format %8d [incr count]] RDE i_test_space"

	set myok [string is space -strict $mycurrent]
	OkFail space


	return
    }

    method i_test_upper {} { ; #TRACE puts "[format %8d [incr count]] RDE i_test_upper"

	set myok [string is upper -strict $mycurrent]
	OkFail upper


	return
    }

    method i_test_wordchar {} { ; #TRACE puts "[format %8d [incr count]] RDE i_test_wordchar"

	set myok [string is wordchar -strict $mycurrent]
	OkFail wordchar


	return
    }

    method i_test_xdigit {} { ; #TRACE puts "[format %8d [incr count]] RDE i_test_xdigit"

	set myok [string is xdigit -strict $mycurrent]
	OkFail xdigit
	return
    }

    # # ## ### ##### ######## ############# #####################
    ## Debugging helper. To activate
    ## string map {{; #TRACE} {; TRACE}}

    proc TRACE {args} {
	uplevel 1 $args
	return
    }

    # # ## ### ##### ######## ############# #####################
    ## Internals

    proc ExtendTC {} {








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	    lassign $myerror loc messages
	    if {$loc == $pos} {
		set myerror [list $loc [list [list n $symbol]]]
	    }
	}}

	$mystackast trim* [$mystackmark pop]
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method si:void_clear_symbol_end {symbol} {
	debug.pt/rdengine {[Instruction si:void_clear_symbol_end $symbol]}
	# i_value_clear
	# i_symbol_save       $symbol
	# i_error_nonterminal $symbol
	# i_loc_pop_discard

	set mysvalue {}
	set at [$mystackloc pop]

	set k  [list $at $symbol]
	set mysymbol($k) [list $myloc $myok $myerror $mysvalue]

	# si:void_clear_symbol_end / i_error_nonterminal -- inlined -- disabled
	if {0} {if {[llength $myerror]} {
	    set  pos $at
	    incr pos
	    lassign $myerror loc messages
	    if {$loc == $pos} {
		set myerror [list $loc [list [list n $symbol]]]
	    }
	}}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    # # ## ### ##### ######## ############# #####################
    ## API - Instructions - Control flow

    method i:ok_continue {} {
	debug.pt/rdengine {[Instruction i:ok_continue]}
	if {!$myok} return
	return -code continue
    }

    method i:fail_continue {} {
	debug.pt/rdengine {[Instruction i:fail_continue]}
	if {$myok} return
	return -code continue
    }

    method i:fail_return {} {
	debug.pt/rdengine {[Instruction i:fail_return]}
	if {$myok} return
	return -code return
    }

    method i:ok_return {} {
	debug.pt/rdengine {[Instruction i:ok_return]}
	if {!$myok} return
	return -code return
    }

    # # ## ### ##### ######## ############# #####################
    ##  API - Instructions - Unconditional matching.

    method i_status_ok {} {
	debug.pt/rdengine {[Instruction i_status_ok]}
	set myok 1
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_status_fail {} {
	debug.pt/rdengine {[Instruction i_status_fail]}
	set myok 0
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_status_negate {} {
	debug.pt/rdengine {[Instruction i_status_negate]}
	set myok [expr {!$myok}]
	debug.pt/rdengine {[InstReturn]}
	return
    }

    # # ## ### ##### ######## ############# #####################
    ##  API - Instructions - Error handling.

    method i_error_clear {} {
	debug.pt/rdengine {[Instruction i_error_clear]}
	set myerror {}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_error_push {} {
	debug.pt/rdengine {[Instruction i_error_push]}
	$mystackerr push $myerror
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_error_clear_push {} {
	debug.pt/rdengine {[Instruction i_error_clear_push]}
	set myerror {}
	$mystackerr push {}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_error_pop_merge {} {
	debug.pt/rdengine {[Instruction i_error_pop_merge]}
	set olderror [$mystackerr pop]

	# We have either old or new error data, keep it.

	if {![llength $myerror]}  { set myerror $olderror ; debug.pt/rdengine {[InstReturn]} ; return }
	if {![llength $olderror]} { debug.pt/rdengine {[InstReturn]} ; return }

	# If one of the errors is further on in the input choose that as
	# the information to propagate.

	lassign $myerror  loe msgse
	lassign $olderror lon msgsn

	if {$lon > $loe} { set myerror $olderror ; debug.pt/rdengine {[InstReturn]} ; return }
	if {$loe > $lon} { debug.pt/rdengine {[InstReturn]} ; return }

	# Equal locations, merge the message lists.
	set myerror [list $loe [lsort -uniq [list {*}$msgse {*}$msgsn]]]
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_error_nonterminal {symbol} {
	debug.pt/rdengine {[Instruction i_error_nonterminal $symbol]}
	#  i_error_nonterminal -- Disabled. Generate only low-level
	#  i_error_nonterminal -- errors until we have worked out how
	#  i_error_nonterminal -- to integrate symbol information with
	#  i_error_nonterminal -- them. Do not forget where this
	#  i_error_nonterminal -- instruction is inlined.
	return

	# Inlined: Errors, Expected.
	if {![llength $myerror]} {
	    debug.pt/rdengine {no error}
	    return
	}
	set pos [$mystackloc peek]
	incr pos
	lassign $myerror loc messages
	if {$loc != $pos} {
	    debug.pt/rdengine {my $myerror != pos $pos}
	    return
	}
	set myerror [list $loc [list [list n $symbol]]]

	debug.pt/rdengine {::= ($myerror)}
	return
    }

    # # ## ### ##### ######## ############# #####################
    ##  API - Instructions - Basic input handling and tracking

    method i_loc_pop_rewind/discard {} {
	debug.pt/rdengine {[Instruction i_loc_pop_rewind/discard]}
	#$myparser i:fail_loc_pop_rewind
	#$myparser i:ok_loc_pop_discard
	#return
	set last [$mystackloc pop]
	if {!$myok} {
	    set myloc $last
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_loc_pop_discard {} {
	debug.pt/rdengine {[Instruction i_loc_pop_discard]}
	$mystackloc pop
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i:ok_loc_pop_discard {} {
	debug.pt/rdengine {[Instruction i:ok_loc_pop_discard]}
	if {$myok} {
	    $mystackloc pop
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_loc_pop_rewind {} {
	debug.pt/rdengine {[Instruction i_loc_pop_rewind]}

	set myloc [$mystackloc pop]
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i:fail_loc_pop_rewind {} {
	debug.pt/rdengine {[Instruction i:fail_loc_pop_rewind]}
	if {!$myok} {
	    set myloc [$mystackloc pop]
	}
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_loc_push {} {
	debug.pt/rdengine {[Instruction i_loc_push]}
	$mystackloc push $myloc
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_loc_rewind {} {
	debug.pt/rdengine {[Instruction i_loc_rewind]}
	# i_loc_pop_rewind - set myloc [$mystackloc pop]
	# i_loc_push       - $mystackloc push $myloc    

	set myloc [$mystackloc peek]
	debug.pt/rdengine {[InstReturn]}
	return
    }

    # # ## ### ##### ######## ############# #####################
    ##  API - Instructions - AST stack handling

    method i_ast_pop_rewind/discard {} {
	debug.pt/rdengine {[Instruction i_ast_pop_rewind/discard]}
	#$myparser i:fail_ast_pop_rewind
	#$myparser i:ok_ast_pop_discard
	#return
	set mark [$mystackmark pop]
	if {!$myok} {
	    $mystackast trim* $mark
	}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_ast_pop_discard/rewind {} {
	debug.pt/rdengine {[Instruction i_ast_pop_discard/rewind]}
	#$myparser i:ok_ast_pop_rewind
	#$myparser i:fail_ast_pop_discard
	#return
	set mark [$mystackmark pop]
	if {$myok} {
	    $mystackast trim* $mark
	}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_ast_pop_discard {} {
	debug.pt/rdengine {[Instruction i_ast_pop_discard]}
	$mystackmark pop

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i:ok_ast_pop_discard {} {
	debug.pt/rdengine {[Instruction i:ok_ast_pop_discard]}
	if {$myok} {
	    $mystackmark pop
	}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_ast_pop_rewind {} {
	debug.pt/rdengine {[Instruction i_ast_pop_rewind]}
	$mystackast trim* [$mystackmark pop]

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i:fail_ast_pop_rewind {} {
	debug.pt/rdengine {[Instruction i:fail_ast_pop_rewind]}
	if {!$myok} {
	    $mystackast trim* [$mystackmark pop]
	}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_ast_push {} {
	debug.pt/rdengine {[Instruction i_ast_push]}
	$mystackmark push [$mystackast size]

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i:ok_ast_value_push {} {
	debug.pt/rdengine {[Instruction i:ok_ast_value_push]}
	if {$myok} {
	    $mystackast push $mysvalue
	}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_ast_rewind {} {
	debug.pt/rdengine {[Instruction i_ast_rewind]}
	# i_ast_pop_rewind - $mystackast  trim* [$mystackmark pop]
	# i_ast_push       - $mystackmark push [$mystackast size]

	$mystackast trim* [$mystackmark peek]

	debug.pt/rdengine {[InstReturn]}
	return
    }

    # # ## ### ##### ######## ############# #####################
    ## API - Instructions - Nonterminal cache

    method i_symbol_restore {symbol} {
	debug.pt/rdengine {[Instruction i_symbol_restore $symbol]}
	# Satisfy from cache if possible.
	set k [list $myloc $symbol]
	if {![info exists mysymbol($k)]} {
	    debug.pt/rdengine {[InstReturn]}
	    return 0
	}
	lassign $mysymbol($k) myloc myok myerror mysvalue
	# We go forward, as the nonterminal matches (or not).
	debug.pt/rdengine {[InstReturn]}
	return 1
    }

    method i_symbol_save {symbol} {
	debug.pt/rdengine {[Instruction i_symbol_save $symbol]}
	# Store not only the value, but also how far
	# the match went (if it was a match).
	set at [$mystackloc peek]
	set k  [list $at $symbol]
	set mysymbol($k) [list $myloc $myok $myerror $mysvalue]

	debug.pt/rdengine {[InstReturn]}
	return
    }

    # # ## ### ##### ######## ############# #####################
    ##  API - Instructions - Semantic values.

    method i_value_clear {} {
	debug.pt/rdengine {[Instruction i_value_clear]}
	set mysvalue {}
	
	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_value_clear/leaf {symbol} {
	debug.pt/rdengine {[Instruction i_value_clear/leaf $symbol] :: ([expr {[$mystackloc peek]+1}])-@$myloc)}

	# not quite value_lead (guarded, and clear on fail)
	# Inlined clear, reduce, and optimized.
	# Clear ; if {$ok} {Reduce $symbol}
	set mysvalue {}
        if {$myok} {
	    set  pos [$mystackloc peek]
	    incr pos

	    if {($pos - 1) == $myloc} {
		# The symbol did not process any input. As this is
		# signaled to be ok (*) we create a node covering an empty
		# range. (Ad *): Can happen for a RHS using toplevel
		# operators * or ?.
		set mysvalue [pt::ast new0 $symbol $pos]
	    } else {
		set mysvalue [pt::ast new $symbol $pos $myloc]
	    }
	}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_value_clear/reduce {symbol} {
	debug.pt/rdengine {[Instruction i_value_clear/reduce $symbol]}
	set mysvalue {}
	if {$myok} {

	    set  mark [$mystackmark peek];# Old size of stack before current nt pushed more.
	    set  newa [expr {[$mystackast size] - $mark}]

	    set  pos  [$mystackloc  peek]
	    incr pos

	    if {!$newa} {
		set mysvalue {}
	    } elseif {$newa == 1} {
		# peek 1 => single element comes back
		set mysvalue [list [$mystackast peek]]     ; # SaveToMark
	    } else {
		# peek n > 1 => list of elements comes back
		set mysvalue [$mystackast peekr $newa]     ; # SaveToMark
	    }

	    if {($pos - 1) == $myloc} {
		# The symbol did not process any input. As this is
		# signaled to be ok (*) we create a node covering an empty
		# range. (Ad *): Can happen for a RHS using toplevel
		# operators * or ?.
		set mysvalue [pt::ast new0 $symbol $pos {*}$mysvalue]
	    } else {
		set mysvalue [pt::ast new $symbol $pos $myloc {*}$mysvalue] ; # Reduce $symbol
	    }
	}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    # # ## ### ##### ######## ############# #####################
    ## API - Instructions - Terminal matching

    method i_input_next {msg} {
	debug.pt/rdengine {[Instruction i_input_next $msg]}
	# Inlined: Getch, Expected, ClearErrors
	# Satisfy from input cache if possible.

	incr myloc
	# May read from the input (ExtendTC), and remember the
	# information. Note: We are implicitly incrementing the
	# location!
	if {($myloc >= [string length $mytoken]) && ![ExtendTC]} {
	    set myok    0
	    set myerror [list $myloc [list $msg]]

	    debug.pt/rdengine {[InstReturn]}
	    return
	}
	set mycurrent [string index $mytoken $myloc]

	set myok    1
	set myerror {}

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_test_char {tok} {
	debug.pt/rdengine {[Instruction i_test_char $tok] :: ok [expr {$tok eq $mycurrent}], [expr {$tok eq $mycurrent ? "@$myloc" : "back@[expr {$myloc-1}]"}]}
	set myok [expr {$tok eq $mycurrent}]



	OkFailD {pt::pe terminal $tok}


	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_test_range {toks toke} {
	debug.pt/rdengine {[Instruction i_test_range $toks $toke]}
	set myok [expr {
			([string compare $toks $mycurrent] <= 0) &&
			([string compare $mycurrent $toke] <= 0)
		    }] ; # {}



	OkFailD {pt::pe range $toks $toke}


	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_test_alnum {} {
	debug.pt/rdengine {[Instruction i_test_alnum]}
	set myok [string is alnum -strict $mycurrent]
	OkFail alnum

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_test_alpha {} {
	debug.pt/rdengine {[Instruction i_test_alpha]}
	set myok [string is alpha -strict $mycurrent]
	OkFail alpha

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_test_ascii {} {
	debug.pt/rdengine {[Instruction i_test_ascii]}
	set myok [string is ascii -strict $mycurrent]
	OkFail ascii

	debug.pt/rdengine {[InstReturn]}
	return
    }


    method i_test_control {} {
	debug.pt/rdengine {[Instruction i_test_control]}
	set myok [string is control -strict $mycurrent]
	OkFail control

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_test_ddigit {} {
	debug.pt/rdengine {[Instruction i_test_ddigit]}
	set myok [string match {[0-9]} $mycurrent]
	OkFail ddigit

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_test_digit {} {
	debug.pt/rdengine {[Instruction i_test_digit]}
	set myok [string is digit -strict $mycurrent]
	OkFail digit

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_test_graph {} {
	debug.pt/rdengine {[Instruction i_test_graph]}
	set myok [string is graph -strict $mycurrent]
	OkFail graph


	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_test_lower {} {
	debug.pt/rdengine {[Instruction i_test_lower]}
	set myok [string is lower -strict $mycurrent]
	OkFail lower

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_test_print {} {
	debug.pt/rdengine {[Instruction i_test_print]}
	set myok [string is print -strict $mycurrent]
	OkFail print

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_test_punct {} {
	debug.pt/rdengine {[Instruction i_test_punct]}
	set myok [string is punct -strict $mycurrent]
	OkFail punct

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_test_space {} {
	debug.pt/rdengine {[Instruction i_test_space]}
	set myok [string is space -strict $mycurrent]
	OkFail space

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_test_upper {} {
	debug.pt/rdengine {[Instruction i_test_upper]}
	set myok [string is upper -strict $mycurrent]
	OkFail upper

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_test_wordchar {} {
	debug.pt/rdengine {[Instruction i_test_wordchar]}
	set myok [string is wordchar -strict $mycurrent]
	OkFail wordchar

	debug.pt/rdengine {[InstReturn]}
	return
    }

    method i_test_xdigit {} {
	debug.pt/rdengine {[Instruction i_test_xdigit]}
	set myok [string is xdigit -strict $mycurrent]
	OkFail xdigit


	debug.pt/rdengine {[InstReturn]}






	return
    }

    # # ## ### ##### ######## ############# #####################
    ## Internals

    proc ExtendTC {} {
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    #                           # the guarded control flow
    #                           # instructions, i.e.
    #                           # i:{ok,fail}_{continue,return}.

    typevariable ourmsg -array {}

    typeconstructor {


	set ourmsg(alnum)     [pt::pe alnum]
	set ourmsg(alpha)     [pt::pe alpha]
	set ourmsg(ascii)     [pt::pe ascii]
	set ourmsg(control)   [pt::pe control]
	set ourmsg(ddigit)    [pt::pe ddigit]
	set ourmsg(digit)     [pt::pe digit]
	set ourmsg(graph)     [pt::pe graph]
	set ourmsg(lower)     [pt::pe lower]
	set ourmsg(print)     [pt::pe printable]
	set ourmsg(punct)     [pt::pe punct]
	set ourmsg(space)     [pt::pe space]
	set ourmsg(upper)     [pt::pe upper]
	set ourmsg(wordchar)  [pt::pe wordchar]
	set ourmsg(xdigit)    [pt::pe xdigit]


	return
    }

    # Parser Input (channel, location (line, column)) ...........

    variable mychan          {} ; # IN. Channel we read the characters
				  # from. Its current location is








>
>














>
>








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    #                           # the guarded control flow
    #                           # instructions, i.e.
    #                           # i:{ok,fail}_{continue,return}.

    typevariable ourmsg -array {}

    typeconstructor {
	debug.pt/rdengine {}

	set ourmsg(alnum)     [pt::pe alnum]
	set ourmsg(alpha)     [pt::pe alpha]
	set ourmsg(ascii)     [pt::pe ascii]
	set ourmsg(control)   [pt::pe control]
	set ourmsg(ddigit)    [pt::pe ddigit]
	set ourmsg(digit)     [pt::pe digit]
	set ourmsg(graph)     [pt::pe graph]
	set ourmsg(lower)     [pt::pe lower]
	set ourmsg(print)     [pt::pe printable]
	set ourmsg(punct)     [pt::pe punct]
	set ourmsg(space)     [pt::pe space]
	set ourmsg(upper)     [pt::pe upper]
	set ourmsg(wordchar)  [pt::pe wordchar]
	set ourmsg(xdigit)    [pt::pe xdigit]

	debug.pt/rdengine {/done}
	return
    }

    # Parser Input (channel, location (line, column)) ...........

    variable mychan          {} ; # IN. Channel we read the characters
				  # from. Its current location is
︙︙

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