Current File : //usr/share/tcltk/tcl8.6/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]} {
set patternList [list "*.tcl" "*[info sharedlibextension]"]
}
try {
set fileList [glob -directory $dir -tails -types {r f} -- \
{*}$patternList]
} on error {msg opt} {
return -options $opt $msg
}
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'"
}
try {
load [lindex $pkg 0] [lindex $pkg 1] $c
} on error err {
if {$doVerbose} {
tclLog "warning: load [lindex $pkg 0]\
[lindex $pkg 1]\nfailed with: $err"
}
} on ok {} {
if {$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 child 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]]
}
try {
$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 $::tcl::x]]
}
}
}
} on error msg {
set what [$c eval set ::tcl::debug]
if {$doVerbose} {
tclLog "warning: error while $what $file: $msg"
}
} on ok {} {
set what [$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 {}
lassign $pkg name version
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
# Get the pkgIndex.tcl files in subdirectories of auto_path directories.
# - Safe Base interpreters have a restricted "glob" command that
# works in this case.
# - The "catch" was essential when there was no safe glob and every
# call in a safe interp failed; it is retained only for corner
# cases in which the eventual call to glob returns an error.
catch {
foreach file [glob -directory $dir -join -nocomplain \
* pkgIndex.tcl] {
set dir [file dirname $file]
if {![info exists procdDirs($dir)]} {
try {
source $file
} trap {POSIX EACCES} {} {
# $file was not readable; silently ignore
continue
} on error msg {
tclLog "error reading package index file $file: $msg"
} on ok {} {
set procdDirs($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])} {
try {
source $file
} trap {POSIX EACCES} {} {
# $file was not readable; silently ignore
continue
} on error msg {
tclLog "error reading package index file $file: $msg"
} on ok {} {
set procdDirs($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)] && ($dir ni $use_path)} {
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
# Safe interpreters do not use tcl::MacOSXPkgUnknown - see init.tcl.
foreach file [glob -directory $dir -join -nocomplain \
* Resources Scripts pkgIndex.tcl] {
set dir [file dirname $file]
if {![info exists procdDirs($dir)]} {
try {
source $file
} trap {POSIX EACCES} {} {
# $file was not readable; silently ignore
continue
} on error msg {
tclLog "error reading package index file $file: $msg"
} on ok {} {
set procdDirs($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)] && ($dir ni $use_path)} {
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 $err(wrongNumArgs)
}
# Initialize parameters
array set opts {-name {} -version {} -source {} -load {}}
# process parameters
for {set i 0} {$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)]} {
error [format $err(valueMissing) "-name"]
}
if {![llength $opts(-version)]} {
error [format $err(valueMissing) "-version"]
}
if {!([llength $opts(-source)] || [llength $opts(-load)])} {
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) {
lassign $filespec filename proclist
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]} {
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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