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Current File : /usr/share/tcl8.5/package.tcl
# package.tcl --
#
# utility procs formerly in init.tcl which can be loaded on demand
# for package management.
#
# 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.
#

namespace eval tcl::Pkg {}

# ::tcl::Pkg::CompareExtension --
#
#  Used internally by pkg_mkIndex to compare the extension of a file to
#  a given extension. On Windows, it uses a case-insensitive comparison
#  because the file system can be file insensitive.
#
# Arguments:
#  fileName	name of a file whose extension is compared
#  ext		(optional) The extension to compare against; you must
#		provide the starting dot.
#		Defaults to [info sharedlibextension]
#
# Results:
#  Returns 1 if the extension matches, 0 otherwise

proc tcl::Pkg::CompareExtension { fileName {ext {}} } {
    global tcl_platform
    if {$ext eq ""} {set ext [info sharedlibextension]}
    if {$tcl_platform(platform) eq "windows"} {
        return [string equal -nocase [file extension $fileName] $ext]
    } else {
        # Some unices add trailing numbers after the .so, so
        # we could have something like '.so.1.2'.
        set root $fileName
        while {1} {
            set currExt [file extension $root]
            if {$currExt eq $ext} {
                return 1
            } 

	    # The current extension does not match; if it is not a numeric
	    # value, quit, as we are only looking to ignore version number
	    # extensions.  Otherwise we might return 1 in this case:
	    #		tcl::Pkg::CompareExtension foo.so.bar .so
	    # which should not match.

	    if { ![string is integer -strict [string range $currExt 1 end]] } {
		return 0
	    }
            set root [file rootname $root]
	}
    }
}

# pkg_mkIndex --
# This procedure creates a package index in a given directory.  The
# package index consists of a "pkgIndex.tcl" file whose contents are
# a Tcl script that sets up package information with "package require"
# commands.  The commands describe all of the packages defined by the
# files given as arguments.
#
# Arguments:
# -direct		(optional) If this flag is present, the generated
#			code in pkgMkIndex.tcl will cause the package to be
#			loaded when "package require" is executed, rather
#			than lazily when the first reference to an exported
#			procedure in the package is made.
# -verbose		(optional) Verbose output; the name of each file that
#			was successfully rocessed is printed out. Additionally,
#			if processing of a file failed a message is printed.
# -load pat		(optional) Preload any packages whose names match
#			the pattern.  Used to handle DLLs that depend on
#			other packages during their Init procedure.
# dir -			Name of the directory in which to create the index.
# args -		Any number of additional arguments, each giving
#			a glob pattern that matches the names of one or
#			more shared libraries or Tcl script files in
#			dir.

proc pkg_mkIndex {args} {
    set usage {"pkg_mkIndex ?-direct? ?-lazy? ?-load pattern? ?-verbose? ?--? dir ?pattern ...?"};

    set argCount [llength $args]
    if {$argCount < 1} {
	return -code error "wrong # args: should be\n$usage"
    }

    set more ""
    set direct 1
    set doVerbose 0
    set loadPat ""
    for {set idx 0} {$idx < $argCount} {incr idx} {
	set flag [lindex $args $idx]
	switch -glob -- $flag {
	    -- {
		# done with the flags
		incr idx
		break
	    }
	    -verbose {
		set doVerbose 1
	    }
	    -lazy {
		set direct 0
		append more " -lazy"
	    }
	    -direct {
		append more " -direct"
	    }
	    -load {
		incr idx
		set loadPat [lindex $args $idx]
		append more " -load $loadPat"
	    }
	    -* {
		return -code error "unknown flag $flag: should be\n$usage"
	    }
	    default {
		# done with the flags
		break
	    }
	}
    }

    set dir [lindex $args $idx]
    set patternList [lrange $args [expr {$idx + 1}] end]
    if {[llength $patternList] == 0} {
	set patternList [list "*.tcl" "*[info sharedlibextension]"]
    }

    if {[catch {
	    glob -directory $dir -tails -types {r f} -- {*}$patternList
    } fileList o]} {
	return -options $o $fileList
    }
    foreach file $fileList {
	# For each file, figure out what commands and packages it provides.
	# To do this, create a child interpreter, load the file into the
	# interpreter, and get a list of the new commands and packages
	# that are defined.

	if {$file eq "pkgIndex.tcl"} {
	    continue
	}

	set c [interp create]

	# Load into the child any packages currently loaded in the parent
	# interpreter that match the -load pattern.

	if {$loadPat ne ""} {
	    if {$doVerbose} {
		tclLog "currently loaded packages: '[info loaded]'"
		tclLog "trying to load all packages matching $loadPat"
	    }
	    if {![llength [info loaded]]} {
		tclLog "warning: no packages are currently loaded, nothing"
		tclLog "can possibly match '$loadPat'"
	    }
	}
	foreach pkg [info loaded] {
	    if {! [string match -nocase $loadPat [lindex $pkg 1]]} {
		continue
	    }
	    if {$doVerbose} {
		tclLog "package [lindex $pkg 1] matches '$loadPat'"
	    }
	    if {[catch {
		load [lindex $pkg 0] [lindex $pkg 1] $c
	    } err]} {
		if {$doVerbose} {
		    tclLog "warning: load [lindex $pkg 0] [lindex $pkg 1]\nfailed with: $err"
		}
	    } elseif {$doVerbose} {
		tclLog "loaded [lindex $pkg 0] [lindex $pkg 1]"
	    }
	    if {[lindex $pkg 1] eq "Tk"} {
		# Withdraw . if Tk was loaded, to avoid showing a window.
		$c eval [list wm withdraw .]
	    }
	}

	$c eval {
	    # Stub out the package command so packages can
	    # require other packages.

	    rename package __package_orig
	    proc package {what args} {
		switch -- $what {
		    require { return ; # ignore transitive requires }
		    default { __package_orig $what {*}$args }
		}
	    }
	    proc tclPkgUnknown args {}
	    package unknown tclPkgUnknown

	    # Stub out the unknown command so package can call
	    # into each other during their initialilzation.

	    proc unknown {args} {}

	    # Stub out the auto_import mechanism

	    proc auto_import {args} {}

	    # reserve the ::tcl namespace for support procs
	    # and temporary variables.  This might make it awkward
	    # to generate a pkgIndex.tcl file for the ::tcl namespace.

	    namespace eval ::tcl {
		variable dir		;# Current directory being processed
		variable file		;# Current file being processed
		variable direct		;# -direct flag value
		variable x		;# Loop variable
		variable debug		;# For debugging
		variable type		;# "load" or "source", for -direct
		variable namespaces	;# Existing namespaces (e.g., ::tcl)
		variable packages	;# Existing packages (e.g., Tcl)
		variable origCmds	;# Existing commands
		variable newCmds	;# Newly created commands
		variable newPkgs {}	;# Newly created packages
	    }
	}

	$c eval [list set ::tcl::dir $dir]
	$c eval [list set ::tcl::file $file]
	$c eval [list set ::tcl::direct $direct]

	# Download needed procedures into the slave because we've
	# just deleted the unknown procedure.  This doesn't handle
	# procedures with default arguments.

	foreach p {::tcl::Pkg::CompareExtension} {
	    $c eval [list namespace eval [namespace qualifiers $p] {}]
	    $c eval [list proc $p [info args $p] [info body $p]]
	}

	if {[catch {
	    $c eval {
		set ::tcl::debug "loading or sourcing"

		# we need to track command defined by each package even in
		# the -direct case, because they are needed internally by
		# the "partial pkgIndex.tcl" step above.

		proc ::tcl::GetAllNamespaces {{root ::}} {
		    set list $root
		    foreach ns [namespace children $root] {
			lappend list {*}[::tcl::GetAllNamespaces $ns]
		    }
		    return $list
		}

		# init the list of existing namespaces, packages, commands

		foreach ::tcl::x [::tcl::GetAllNamespaces] {
		    set ::tcl::namespaces($::tcl::x) 1
		}
		foreach ::tcl::x [package names] {
		    if {[package provide $::tcl::x] ne ""} {
			set ::tcl::packages($::tcl::x) 1
		    }
		}
		set ::tcl::origCmds [info commands]

		# Try to load the file if it has the shared library
		# extension, otherwise source it.  It's important not to
		# try to load files that aren't shared libraries, because
		# on some systems (like SunOS) the loader will abort the
		# whole application when it gets an error.

		if {[::tcl::Pkg::CompareExtension $::tcl::file [info sharedlibextension]]} {
		    # The "file join ." command below is necessary.
		    # Without it, if the file name has no \'s and we're
		    # on UNIX, the load command will invoke the
		    # LD_LIBRARY_PATH search mechanism, which could cause
		    # the wrong file to be used.

		    set ::tcl::debug loading
		    load [file join $::tcl::dir $::tcl::file]
		    set ::tcl::type load
		} else {
		    set ::tcl::debug sourcing
		    source [file join $::tcl::dir $::tcl::file]
		    set ::tcl::type source
		}

		# As a performance optimization, if we are creating 
		# direct load packages, don't bother figuring out the 
		# set of commands created by the new packages.  We 
		# only need that list for setting up the autoloading 
		# used in the non-direct case.
		if { !$::tcl::direct } {
		    # See what new namespaces appeared, and import commands
		    # from them.  Only exported commands go into the index.
		    
		    foreach ::tcl::x [::tcl::GetAllNamespaces] {
			if {! [info exists ::tcl::namespaces($::tcl::x)]} {
			    namespace import -force ${::tcl::x}::*
			}

			# Figure out what commands appeared
			
			foreach ::tcl::x [info commands] {
			    set ::tcl::newCmds($::tcl::x) 1
			}
			foreach ::tcl::x $::tcl::origCmds {
			    unset -nocomplain ::tcl::newCmds($::tcl::x)
			}
			foreach ::tcl::x [array names ::tcl::newCmds] {
			    # determine which namespace a command comes from
			    
			    set ::tcl::abs [namespace origin $::tcl::x]
			    
			    # special case so that global names have no leading
			    # ::, this is required by the unknown command
			    
			    set ::tcl::abs \
				    [lindex [auto_qualify $::tcl::abs ::] 0]
			    
			    if {$::tcl::x ne $::tcl::abs} {
				# Name changed during qualification
				
				set ::tcl::newCmds($::tcl::abs) 1
				unset ::tcl::newCmds($::tcl::x)
			    }
			}
		    }
		}

		# Look through the packages that appeared, and if there is
		# a version provided, then record it

		foreach ::tcl::x [package names] {
		    if {[package provide $::tcl::x] ne ""
			    && ![info exists ::tcl::packages($::tcl::x)]} {
			lappend ::tcl::newPkgs \
			    [list $::tcl::x [package provide $::tcl::x]]
		    }
		}
	    }
	} msg] == 1} {
	    set what [$c eval set ::tcl::debug]
	    if {$doVerbose} {
		tclLog "warning: error while $what $file: $msg"
	    }
	} else {
	    set what [$c eval set ::tcl::debug]
	    if {$doVerbose} {
		tclLog "successful $what of $file"
	    }
	    set type [$c eval set ::tcl::type]
	    set cmds [lsort [$c eval array names ::tcl::newCmds]]
	    set pkgs [$c eval set ::tcl::newPkgs]
	    if {$doVerbose} {
		if { !$direct } {
		    tclLog "commands provided were $cmds"
		}
		tclLog "packages provided were $pkgs"
	    }
	    if {[llength $pkgs] > 1} {
		tclLog "warning: \"$file\" provides more than one package ($pkgs)"
	    }
	    foreach pkg $pkgs {
		# cmds is empty/not used in the direct case
		lappend files($pkg) [list $file $type $cmds]
	    }

	    if {$doVerbose} {
		tclLog "processed $file"
	    }
	}
	interp delete $c
    }

    append index "# Tcl package index file, version 1.1\n"
    append index "# This file is generated by the \"pkg_mkIndex$more\" command\n"
    append index "# and sourced either when an application starts up or\n"
    append index "# by a \"package unknown\" script.  It invokes the\n"
    append index "# \"package ifneeded\" command to set up package-related\n"
    append index "# information so that packages will be loaded automatically\n"
    append index "# in response to \"package require\" commands.  When this\n"
    append index "# script is sourced, the variable \$dir must contain the\n"
    append index "# full path name of this file's directory.\n"

    foreach pkg [lsort [array names files]] {
	set cmd {}
	foreach {name version} $pkg {
	    break
	}
	lappend cmd ::tcl::Pkg::Create -name $name -version $version
	foreach spec [lsort -index 0 $files($pkg)] {
	    foreach {file type procs} $spec {
		if { $direct } {
		    set procs {}
		}
		lappend cmd "-$type" [list $file $procs]
	    }
	}
	append index "\n[eval $cmd]"
    }

    set f [open [file join $dir pkgIndex.tcl] w]
    puts $f $index
    close $f
}

# tclPkgSetup --
# This is a utility procedure use by pkgIndex.tcl files.  It is invoked
# as part of a "package ifneeded" script.  It calls "package provide"
# to indicate that a package is available, then sets entries in the
# auto_index array so that the package's files will be auto-loaded when
# the commands are used.
#
# Arguments:
# dir -			Directory containing all the files for this package.
# pkg -			Name of the package (no version number).
# version -		Version number for the package, such as 2.1.3.
# files -		List of files that constitute the package.  Each
#			element is a sub-list with three elements.  The first
#			is the name of a file relative to $dir, the second is
#			"load" or "source", indicating whether the file is a
#			loadable binary or a script to source, and the third
#			is a list of commands defined by this file.

proc tclPkgSetup {dir pkg version files} {
    global auto_index

    package provide $pkg $version
    foreach fileInfo $files {
	set f [lindex $fileInfo 0]
	set type [lindex $fileInfo 1]
	foreach cmd [lindex $fileInfo 2] {
	    if {$type eq "load"} {
		set auto_index($cmd) [list load [file join $dir $f] $pkg]
	    } else {
		set auto_index($cmd) [list source [file join $dir $f]]
	    } 
	}
    }
}

# tclPkgUnknown --
# This procedure provides the default for the "package unknown" function.
# It is invoked when a package that's needed can't be found.  It scans
# the auto_path directories and their immediate children looking for
# pkgIndex.tcl files and sources any such files that are found to setup
# the package database. As it searches, it will recognize changes
# to the auto_path and scan any new directories.
#
# Arguments:
# name -		Name of desired package.  Not used.
# version -		Version of desired package.  Not used.
# exact -		Either "-exact" or omitted.  Not used.

proc tclPkgUnknown {name args} {
    global auto_path env

    if {![info exists auto_path]} {
	return
    }
    # Cache the auto_path, because it may change while we run through
    # the first set of pkgIndex.tcl files
    set old_path [set use_path $auto_path]
    while {[llength $use_path]} {
	set dir [lindex $use_path end]
	
	# Make sure we only scan each directory one time.
	if {[info exists tclSeenPath($dir)]} {
	    set use_path [lrange $use_path 0 end-1]
	    continue
	}
	set tclSeenPath($dir) 1

	# we can't use glob in safe interps, so enclose the following
	# in a catch statement, where we get the pkgIndex files out
	# of the subdirectories
	catch {
	    foreach file [glob -directory $dir -join -nocomplain \
		    * pkgIndex.tcl] {
		set dir [file dirname $file]
		if {![info exists procdDirs($dir)]} {
		    set code [catch {source $file} msg opt]
		    if {$code == 1 &&
			    [lindex [dict get $opt -errorcode] 0] eq "POSIX" &&
			    [lindex [dict get $opt -errorcode] 1] eq "EACCES"} {
			# $file was not readable; silently ignore
			continue
		    }
		    if {$code} {
			tclLog "error reading package index file $file: $msg"
		    } else {
			set procdDirs($dir) 1
		    }
		}
	    }
	}
	set dir [lindex $use_path end]
	if {![info exists procdDirs($dir)]} {
	    set file [file join $dir pkgIndex.tcl]
	    # safe interps usually don't have "file exists", 
	    if {([interp issafe] || [file exists $file])} {
		set code [catch {source $file} msg opt]
		if {$code == 1 &&
			[lindex [dict get $opt -errorcode] 0] eq "POSIX" &&
			[lindex [dict get $opt -errorcode] 1] eq "EACCES"} {
		    # $file was not readable; silently ignore
		    continue
		}
		if {$code}  {
		    tclLog "error reading package index file $file: $msg"
		} else {
		    set procdDirs($dir) 1
		}
	    }
	}

	set use_path [lrange $use_path 0 end-1]

	# Check whether any of the index scripts we [source]d above
	# set a new value for $::auto_path.  If so, then find any
	# new directories on the $::auto_path, and lappend them to
	# the $use_path we are working from.  This gives index scripts
	# the (arguably unwise) power to expand the index script search
	# path while the search is in progress.
	set index 0
	if {[llength $old_path] == [llength $auto_path]} {
	    foreach dir $auto_path old $old_path {
		if {$dir ne $old} {
		    # This entry in $::auto_path has changed.
		    break
		}
		incr index
	    }
	}

	# $index now points to the first element of $auto_path that
	# has changed, or the beginning if $auto_path has changed length
	# Scan the new elements of $auto_path for directories to add to
	# $use_path.  Don't add directories we've already seen, or ones
	# already on the $use_path.
	foreach dir [lrange $auto_path $index end] {
	    if {![info exists tclSeenPath($dir)] 
		    && ([lsearch -exact $use_path $dir] == -1) } {
		lappend use_path $dir
	    }
	}
	set old_path $auto_path
    }
}

# tcl::MacOSXPkgUnknown --
# This procedure extends the "package unknown" function for MacOSX.
# It scans the Resources/Scripts directories of the immediate children
# of the auto_path directories for pkgIndex files.
#
# Arguments:
# original -		original [package unknown] procedure
# name -		Name of desired package.  Not used.
# version -		Version of desired package.  Not used.
# exact -		Either "-exact" or omitted.  Not used.

proc tcl::MacOSXPkgUnknown {original name args} {

    #  First do the cross-platform default search
    uplevel 1 $original [linsert $args 0 $name]

    # Now do MacOSX specific searching
    global auto_path

    if {![info exists auto_path]} {
	return
    }
    # Cache the auto_path, because it may change while we run through
    # the first set of pkgIndex.tcl files
    set old_path [set use_path $auto_path]
    while {[llength $use_path]} {
	set dir [lindex $use_path end]

	# Make sure we only scan each directory one time.
	if {[info exists tclSeenPath($dir)]} {
	    set use_path [lrange $use_path 0 end-1]
	    continue
	}
	set tclSeenPath($dir) 1

	# get the pkgIndex files out of the subdirectories
	foreach file [glob -directory $dir -join -nocomplain \
		* Resources Scripts pkgIndex.tcl] {
	    set dir [file dirname $file]
	    if {![info exists procdDirs($dir)]} {
		set code [catch {source $file} msg opt]
		if {$code == 1 &&
			[lindex [dict get $opt -errorcode] 0] eq "POSIX" &&
			[lindex [dict get $opt -errorcode] 1] eq "EACCES"} {
		    # $file was not readable; silently ignore
		    continue
		}
		if {$code} {
		    tclLog "error reading package index file $file: $msg"
		} else {
		    set procdDirs($dir) 1
		}
	    }
	}
	set use_path [lrange $use_path 0 end-1]

	# Check whether any of the index scripts we [source]d above
	# set a new value for $::auto_path.  If so, then find any
	# new directories on the $::auto_path, and lappend them to
	# the $use_path we are working from.  This gives index scripts
	# the (arguably unwise) power to expand the index script search
	# path while the search is in progress.
	set index 0
	if {[llength $old_path] == [llength $auto_path]} {
	    foreach dir $auto_path old $old_path {
		if {$dir ne $old} {
		    # This entry in $::auto_path has changed.
		    break
		}
		incr index
	    }
	}

	# $index now points to the first element of $auto_path that
	# has changed, or the beginning if $auto_path has changed length
	# Scan the new elements of $auto_path for directories to add to
	# $use_path.  Don't add directories we've already seen, or ones
	# already on the $use_path.
	foreach dir [lrange $auto_path $index end] {
	    if {![info exists tclSeenPath($dir)] 
		    && ([lsearch -exact $use_path $dir] == -1) } {
		lappend use_path $dir
	    }
	}
	set old_path $auto_path
    }
}

# ::tcl::Pkg::Create --
#
#	Given a package specification generate a "package ifneeded" statement
#	for the package, suitable for inclusion in a pkgIndex.tcl file.
#
# Arguments:
#	args		arguments used by the Create function:
#			-name		packageName
#			-version	packageVersion
#			-load		{filename ?{procs}?}
#			...
#			-source		{filename ?{procs}?}
#			...
#
#			Any number of -load and -source parameters may be
#			specified, so long as there is at least one -load or
#			-source parameter.  If the procs component of a 
#			module specifier is left off, that module will be
#			set up for direct loading; otherwise, it will be
#			set up for lazy loading.  If both -source and -load
#			are specified, the -load'ed files will be loaded 
#			first, followed by the -source'd files.
#
# Results:
#	An appropriate "package ifneeded" statement for the package.

proc ::tcl::Pkg::Create {args} {
    append err(usage) "[lindex [info level 0] 0] "
    append err(usage) "-name packageName -version packageVersion"
    append err(usage) "?-load {filename ?{procs}?}? ... "
    append err(usage) "?-source {filename ?{procs}?}? ..."

    set err(wrongNumArgs) "wrong # args: should be \"$err(usage)\""
    set err(valueMissing) "value for \"%s\" missing: should be \"$err(usage)\""
    set err(unknownOpt)   "unknown option \"%s\": should be \"$err(usage)\""
    set err(noLoadOrSource) "at least one of -load and -source must be given"

    # process arguments
    set len [llength $args]
    if { $len < 6 } {
	error $err(wrongNumArgs)
    }
    
    # Initialize parameters
    set opts(-name)		{}
    set opts(-version)		{}
    set opts(-source)		{}
    set opts(-load)		{}

    # process parameters
    for {set i 0} {$i < $len} {incr i} {
	set flag [lindex $args $i]
	incr i
	switch -glob -- $flag {
	    "-name"		-
	    "-version"		{
		if { $i >= $len } {
		    error [format $err(valueMissing) $flag]
		}
		set opts($flag) [lindex $args $i]
	    }
	    "-source"		-
	    "-load"		{
		if { $i >= $len } {
		    error [format $err(valueMissing) $flag]
		}
		lappend opts($flag) [lindex $args $i]
	    }
	    default {
		error [format $err(unknownOpt) [lindex $args $i]]
	    }
	}
    }

    # Validate the parameters
    if { [llength $opts(-name)] == 0 } {
	error [format $err(valueMissing) "-name"]
    }
    if { [llength $opts(-version)] == 0 } {
	error [format $err(valueMissing) "-version"]
    }
    
    if { [llength $opts(-source)] == 0 && [llength $opts(-load)] == 0 } {
	error $err(noLoadOrSource)
    }

    # OK, now everything is good.  Generate the package ifneeded statment.
    set cmdline "package ifneeded $opts(-name) $opts(-version) "
    
    set cmdList {}
    set lazyFileList {}

    # Handle -load and -source specs
    foreach key {load source} {
	foreach filespec $opts(-$key) {
	    foreach {filename proclist} {{} {}} {
		break
	    }
	    foreach {filename proclist} $filespec {
		break
	    }
	    
	    if { [llength $proclist] == 0 } {
		set cmd "\[list $key \[file join \$dir [list $filename]\]\]"
		lappend cmdList $cmd
	    } else {
		lappend lazyFileList [list $filename $key $proclist]
	    }
	}
    }

    if { [llength $lazyFileList] > 0 } {
	lappend cmdList "\[list tclPkgSetup \$dir $opts(-name)\
		$opts(-version) [list $lazyFileList]\]"
    }
    append cmdline [join $cmdList "\\n"]
    return $cmdline
}

interp alias {} ::pkg::create {} ::tcl::Pkg::Create

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