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Direktori : /usr/share/tcl8.5/ |
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# 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