Tcl Source Code

# auto.tcl --
#
# utility procs formerly in init.tcl dealing with auto execution
# of commands and can be auto loaded themselves.
#
# RCS: @(#) $Id: auto.tcl,v 1.1.2.8 1999/03/31 19:54:15 welch Exp $
#
# Copyright (c) 1991-1993 The Regents of the University of California.
# Copyright (c) 1994-1998 Sun Microsystems, Inc.
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
#

# auto_reset --
#
# Destroy all cached information for auto-loading and auto-execution,
# so that the information gets recomputed the next time it's needed.
# Also delete any procedures that are listed in the auto-load index
# except those defined in this file.
#
# Arguments: 
# None.

	}
    }
    catch {unset auto_execs}
    catch {unset auto_index}
    catch {unset auto_oldpath}
}

# tcl_findLibrary --
#

#	This is a utility for extensions that searches for a library directory
#	using a canonical searching algorithm. A side effect is to source
#	the initialization script and set a global library variable.
#
# Arguments:
# 	basename	Prefix of the directory name, (e.g., "tk")
#	version		Version number of the package, (e.g., "8.0")
#	patch		Patchlevel of the package, (e.g., "8.0.3")
#	initScript	Initialization script to source (e.g., tk.tcl)
#	enVarName	environment variable to honor (e.g., TK_LIBRARY)
#	varName		Global variable to set when done (e.g., tk_library)

	    $parser hide proc
	    $parser hide namespace
	    $parser hide eval
	    $parser hide puts
	    $parser invokehidden namespace delete ::
	    $parser invokehidden proc unknown {args} {}


	    # We'll need access to the "namespace" command within the
	    # interp.  Put it back, but move it out of the way.

	    $parser expose namespace
	    $parser invokehidden rename namespace _%@namespace
	    $parser expose eval
	    $parser invokehidden rename eval _%@eval

	    # Install all the registered psuedo-command implementations

	    foreach cmd $initCommands {
		eval $cmd
	    }
	}
    }
    proc cleanup {} {
	variable parser
	interp delete $parser
	unset parser
    }
}

# auto_mkindex_parser::mkindex --
#
# Used by the "auto_mkindex" command to create a "tclIndex" file for
# the given Tcl source file.  Executes the commands in the file, and
# handles things like the "proc" command by adding an entry for the
# index file.  Returns a string that represents the index file.
#
# Arguments: 
#	file	Name of Tcl source file to be indexed.

proc auto_mkindex_parser::mkindex {file} {
    variable parser
    variable index
    variable scriptFile
    variable contextStack
    variable imports

    foreach name $imports {
        catch {$parser eval [list _%@namespace forget $name]}
    }
    return $index
}

# auto_mkindex_parser::hook command
#
# Registers a Tcl command to evaluate when initializing the
# slave interpreter used by the mkindex parser.
# The command is evaluated in the master interpreter, and can
# use the variable auto_mkindex_parser::parser to get to the slave

proc auto_mkindex_parser::hook {cmd} {
    variable initCommands

    lappend initCommands $cmd
}

# auto_mkindex_parser::slavehook command
#
# Registers a Tcl command to evaluate when initializing the
# slave interpreter used by the mkindex parser.
# The command is evaluated in the slave interpreter.

proc auto_mkindex_parser::slavehook {cmd} {
    variable initCommands

    # The $parser variable is defined to be the name of the
    # slave interpreter when this command is used later.

    lappend initCommands "\$parser eval [list $cmd]"
}

# auto_mkindex_parser::command --
#
# Registers a new command with the "auto_mkindex_parser" interpreter
# that parses Tcl files.  These commands are fake versions of things
# like the "proc" command.  When you execute them, they simply write
# out an entry to a "tclIndex" file for auto-loading.
#
# This procedure allows extensions to register their own commands
# with the auto_mkindex facility.  For example, a package like
# [incr Tcl] might register a "class" command so that class definitions
# could be added to a "tclIndex" file for auto-loading.
#
# Arguments:
#	name 	Name of command recognized in Tcl files.
#	arglist	Argument list for command.
#	body 	Implementation of command to handle indexing.

proc auto_mkindex_parser::command {name arglist body} {
    hook [list auto_mkindex_parser::commandInit $name $arglist $body]
}

# auto_mkindex_parser::commandInit --
#
# This does the actual work set up by auto_mkindex_parser::command
# This is called when the interpreter used by the parser is created.
#
# Arguments:
#	name 	Name of command recognized in Tcl files.
#	arglist	Argument list for command.
#	body 	Implementation of command to handle indexing.

proc auto_mkindex_parser::commandInit {name arglist body} {
    variable parser

    set ns [namespace qualifiers $name]
    set tail [namespace tail $name]
    if {$ns == ""} {
        set fakeName "[namespace current]::_%@fake_$tail"
    } else {
        set fakeName "_%@fake_$name"
        regsub -all {::} $fakeName "_" fakeName
        set fakeName "[namespace current]::$fakeName"
    }
    proc $fakeName $arglist $body


    # YUK!  Tcl won't let us alias fully qualified command names,
    # so we can't handle names like "::itcl::class".  Instead,
    # we have to build procs with the fully qualified names, and
    # have the procs point to the aliases.

    if {[regexp {::} $name]} {
        set exportCmd [list _%@namespace export [namespace tail $name]]
        $parser eval [list _%@namespace eval $ns $exportCmd]
 
	# The following proc definition does not work if you
	# want to tolerate space or something else diabolical
	# in the procedure name, (i.e., space in $alias)
	# The following does not work:
	#   "_%@eval {$alias} \$args"
	# because $alias gets concat'ed to $args.
	# The following does not work because $cmd is somehow undefined
	#   "set cmd {$alias} \; _%@eval {\$cmd} \$args"
	# A gold star to someone that can make test
	# autoMkindex-3.3 work properly

        set alias [namespace tail $fakeName]
        $parser invokehidden proc $name {args} "_%@eval {$alias} \$args"
        $parser alias $alias $fakeName
    } else {
        $parser alias $name $fakeName
    }
    return
}