auto.tcl

基于语义本体的单词查询系统

	}
    }
    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

    set scriptFile $file

    set fid [open $file]
    set contents [read $fid]
    close $fid

    # There is one problem with sourcing files into the safe
    # interpreter:  references like "$x" will fail since code is not
    # really being executed and variables do not really exist.
    # To avoid this, we replace all $ with \0 (literally, the null char)
    # later, when getting proc names we will have to reverse this replacement,
    # in case there were any $ in the proc name.  This will cause a problem
    # if somebody actually tries to have a \0 in their proc name.  Too bad
    # for them.
    regsub -all {\$} $contents "\0" contents
    
    set index ""
    set contextStack ""
    set imports ""

    $parser eval $contents

    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 {[string equal $ns ""]} {
        set fakeName "[namespace current]::_%@fake_$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
}

# auto_mkindex_parser::fullname --
# Used by commands like "proc" within the auto_mkindex parser.
# Returns the qualified namespace name for the "name" argument.
# If the "name" does not start with "::", elements are added from
# the current namespace stack to produce a qualified name.  Then,
# the name is examined to see whether or not it should really be
# qualified.  If the name has more than the leading "::", it is
# returned as a fully qualified name.  Otherwise, it is returned
# as a simple name.  That way, the Tcl autoloader will recognize
# it properly.
#
# Arguments:
# name -		Name that is being added to index.

proc auto_mkindex_parser::fullname {name} {
    variable contextStack

    if {![string match ::* $name]} {
        foreach ns $contextStack {
            set name "${ns}::$name"
            if {[string match ::* $name]} {
                break
            }
        }
    }

    if {[string equal [namespace qualifiers $name] ""]} {
        set name [namespace tail $name]
    } elseif {![string match ::* $name]} {
        set name "::$name"
    }
    
    # Earlier, mkindex replaced all $'s with \0.  Now, we have to reverse
    # that replacement.
    regsub -all "\0" $name "\$" name
    return $name
}

# Register all of the procedures for the auto_mkindex parser that
# will build the "tclIndex" file.

# AUTO MKINDEX:  proc name arglist body
# Adds an entry to the auto index list for the given procedure name.

auto_mkindex_parser::command proc {name args} {
    variable index
    variable scriptFile
    # Do some fancy reformatting on the "source" call to handle platform
    # differences with respect to pathnames.  Use format just so that the
    # command is a little easier to read (otherwise it'd be full of 
    # backslashed dollar signs, etc.
    append index [list set auto_index([fullname $name])] \
	    [format { [list source [file join $dir %s]]} \
	    [file split $scriptFile]] "\n"
}

# Conditionally add support for Tcl byte code files.  There are some
# tricky details here.  First, we need to get the tbcload library
# initialized in the current interpreter.  We cannot load tbcload into the
# slave until we have done so because it needs access to the tcl_patchLevel
# variable.  Second, because the package index file may defer loading the
# library until we invoke a command, we need to explicitly invoke auto_load
# to force it to be loaded.  This should be a noop if the package has
# already been loaded

auto_mkindex_parser::hook {
    if {![catch {package require tbcload}]} {
	if {[llength [info commands tbcload::bcproc]] == 0} {
	    auto_load tbcload::bcproc
	}
	load {} tbcload $auto_mkindex_parser::parser

	# AUTO MKINDEX:  tbcload::bcproc name arglist body
	# Adds an entry to the auto index list for the given pre-compiled
	# procedure name.  

	auto_mkindex_parser::commandInit tbcload::bcproc {name args} {
	    variable index
	    variable scriptFile
	    # Do some nice reformatting of the "source" call, to get around
	    # path differences on different platforms.  We use the format
	    # command just so that the code is a little easier to read.
	    append index [list set auto_index([fullname $name])] \
		    [format { [list source [file join $dir %s]]} \
		    [file split $scriptFile]] "\n"
	}
    }
}

# AUTO MKINDEX:  namespace eval name command ?arg arg...?
# Adds the namespace name onto the context stack and evaluates the
# associated body of commands.
#
# AUTO MKINDEX:  namespace import ?-force? pattern ?pattern...?
# Performs the "import" action in the parser interpreter.  This is
# important for any commands contained in a namespace that affect
# the index.  For example, a script may say "itcl::class ...",
# or it may import "itcl::*" and then say "class ...".  This
# procedure does the import operation, but keeps track of imported
# patterns so we can remove the imports later.

auto_mkindex_parser::command namespace {op args} {
    switch -- $op {
        eval {
            variable parser
            variable contextStack

            set name [lindex $args 0]
            set args [lrange $args 1 end]

            set contextStack [linsert $contextStack 0 $name]
	    $parser eval [list _%@namespace eval $name] $args
            set contextStack [lrange $contextStack 1 end]
        }
        import {
            variable parser
            variable imports
            foreach pattern $args {
                if {[string compare $pattern "-force"]} {
                    lappend imports $pattern
                }
            }
            catch {$parser eval "_%@namespace import $args"}
        }
    }
}

return