tcl.git - Tcl is a high-level, general-purpose, interpreted, dynamic programming language. It was designed with the goal of being very simple but powerful.

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# init.tcl -- # # Default system startup file for Tcl-based applications. Defines # "unknown" procedure and auto-load facilities. # # Copyright (c) 1991-1993 The Regents of the University of California. # Copyright (c) 1994-1996 Sun Microsystems, Inc. # Copyright (c) 1998-1999 Scriptics Corporation. # Copyright (c) 2004 by Kevin B. Kenny. All rights reserved. # # See the file "license.terms" for information on usage and redistribution # of this file, and for a DISCLAIMER OF ALL WARRANTIES. # # This test intentionally written in pre-7.5 Tcl if {[info commands package] == ""} { error "version mismatch: library\nscripts expect Tcl version 7.5b1 or later but the loaded version is\nonly [info patchlevel]" } package require -exact Tcl 8.7a0 # Compute the auto path to use in this interpreter. # The values on the path come from several locations: # # The environment variable TCLLIBPATH # # tcl_library, which is the directory containing this init.tcl script. # [tclInit] (Tcl_Init()) searches around for the directory containing this # init.tcl and defines tcl_library to that location before sourcing it. # # The parent directory of tcl_library. Adding the parent # means that packages in peer directories will be found automatically. # # Also add the directory ../lib relative to the directory where the # executable is located. This is meant to find binary packages for the # same architecture as the current executable. # # tcl_pkgPath, which is set by the platform-specific initialization routines # On UNIX it is compiled in # On Windows, it is not used if {![info exists auto_path]} { if {[info exists env(TCLLIBPATH)]} { set auto_path $env(TCLLIBPATH) } else { set auto_path "" } } namespace eval tcl { variable Dir foreach Dir [list $::tcl_library [file dirname $::tcl_library]] { if {$Dir ni $::auto_path} { lappend ::auto_path $Dir } } set Dir [file join [file dirname [file dirname \ [info nameofexecutable]]] lib] if {$Dir ni $::auto_path} { lappend ::auto_path $Dir } catch { foreach Dir $::tcl_pkgPath { if {$Dir ni $::auto_path} { lappend ::auto_path $Dir } } } if {![interp issafe]} { variable Path [encoding dirs] set Dir [file join $::tcl_library encoding] if {$Dir ni $Path} { lappend Path $Dir encoding dirs $Path } } # TIP #255 min and max functions namespace eval mathfunc { proc min {args} { if {![llength $args]} { return -code error \ "too few arguments to math function \"min\"" } set val Inf foreach arg $args { # This will handle forcing the numeric value without # ruining the internal type of a numeric object if {[catch {expr {double($arg)}} err]} { return -code error $err } if {$arg < $val} {set val $arg} } return $val } proc max {args} { if {![llength $args]} { return -code error \ "too few arguments to math function \"max\"" } set val -Inf foreach arg $args { # This will handle forcing the numeric value without # ruining the internal type of a numeric object if {[catch {expr {double($arg)}} err]} { return -code error $err } if {$arg > $val} {set val $arg} } return $val } namespace export min max } } # Windows specific end of initialization if {(![interp issafe]) && ($tcl_platform(platform) eq "windows")} { namespace eval tcl { proc EnvTraceProc {lo n1 n2 op} { global env set x $env($n2) set env($lo) $x set env([string toupper $lo]) $x } proc InitWinEnv {} { global env tcl_platform foreach p [array names env] { set u [string toupper $p] if {$u ne $p} { switch -- $u { COMSPEC - PATH { set temp $env($p) unset env($p) set env($u) $temp trace add variable env($p) write \ [namespace code [list EnvTraceProc $p]] trace add variable env($u) write \ [namespace code [list EnvTraceProc $p]] } } } } if {![info exists env(COMSPEC)]} { set env(COMSPEC) cmd.exe } } InitWinEnv } } # Setup the unknown package handler if {[interp issafe]} { package unknown {::tcl::tm::UnknownHandler ::tclPkgUnknown} } else { # Set up search for Tcl Modules (TIP #189). # and setup platform specific unknown package handlers if {$tcl_platform(os) eq "Darwin" && $tcl_platform(platform) eq "unix"} { package unknown {::tcl::tm::UnknownHandler \ {::tcl::MacOSXPkgUnknown ::tclPkgUnknown}} } else { package unknown {::tcl::tm::UnknownHandler ::tclPkgUnknown} } # Set up the 'clock' ensemble namespace eval ::tcl::clock [list variable TclLibDir $::tcl_library] proc clock args { namespace eval ::tcl::clock [list namespace ensemble create -command \ [uplevel 1 [list namespace origin [lindex [info level 0] 0]]] \ -subcommands { add clicks format microseconds milliseconds scan seconds }] # Auto-loading stubs for 'clock.tcl' foreach cmd {add format LocalizeFormat SetupTimeZone GetSystemTimeZone __org_scan} { proc ::tcl::clock::$cmd args { variable TclLibDir source -encoding utf-8 [file join $TclLibDir clock.tcl] return [uplevel 1 [info level 0]] } } return [uplevel 1 [info level 0]] } } # Conditionalize for presence of exec. if {[namespace which -command exec] eq ""} { # Some machines do not have exec. Also, on all # platforms, safe interpreters do not have exec. set auto_noexec 1 } # Define a log command (which can be overwitten to log errors # differently, specially when stderr is not available) if {[namespace which -command tclLog] eq ""} { proc tclLog {string} { catch {puts stderr $string} } } # unknown -- # This procedure is called when a Tcl command is invoked that doesn't # exist in the interpreter. It takes the following steps to make the # command available: # # 1. See if the autoload facility can locate the command in a # Tcl script file. If so, load it and execute it. # 2. If the command was invoked interactively at top-level: # (a) see if the command exists as an executable UNIX program. # If so, "exec" the command. # (b) see if the command requests csh-like history substitution # in one of the common forms !!, !<number>, or ^old^new. If # so, emulate csh's history substitution. # (c) see if the command is a unique abbreviation for another # command. If so, invoke the command. # # Arguments: # args - A list whose elements are the words of the original # command, including the command name. proc unknown args { variable ::tcl::UnknownPending global auto_noexec auto_noload env tcl_interactive errorInfo errorCode if {[info exists errorInfo]} { set savedErrorInfo $errorInfo } if {[info exists errorCode]} { set savedErrorCode $errorCode } set name [lindex $args 0] if {![info exists auto_noload]} { # # Make sure we're not trying to load the same proc twice. # if {[info exists UnknownPending($name)]} { return -code error "self-referential recursion\ in \"unknown\" for command \"$name\"" } set UnknownPending($name) pending set ret [catch { auto_load $name [uplevel 1 {::namespace current}] } msg opts] unset UnknownPending($name) if {$ret != 0} { dict append opts -errorinfo "\n (autoloading \"$name\")" return -options $opts $msg } if {![array size UnknownPending]} { unset UnknownPending } if {$msg} { if {[info exists savedErrorCode]} { set ::errorCode $savedErrorCode } else { unset -nocomplain ::errorCode } if {[info exists savedErrorInfo]} { set errorInfo $savedErrorInfo } else { unset -nocomplain errorInfo } set code [catch {uplevel 1 $args} msg opts] if {$code == 1} { # # Compute stack trace contribution from the [uplevel]. # Note the dependence on how Tcl_AddErrorInfo, etc. # construct the stack trace. # set errInfo [dict get $opts -errorinfo] set errCode [dict get $opts -errorcode] set cinfo $args if {[string bytelength $cinfo] > 150} { set cinfo [string range $cinfo 0 150] while {[string bytelength $cinfo] > 150} { set cinfo [string range $cinfo 0 end-1] } append cinfo ... } append cinfo "\"\n (\"uplevel\" body line 1)" append cinfo "\n invoked from within" append cinfo "\n\"uplevel 1 \$args\"" # # Try each possible form of the stack trace # and trim the extra contribution from the matching case # set expect "$msg\n while executing\n\"$cinfo" if {$errInfo eq $expect} { # # The stack has only the eval from the expanded command # Do not generate any stack trace here. # dict unset opts -errorinfo dict incr opts -level return -options $opts $msg } # # Stack trace is nested, trim off just the contribution # from the extra "eval" of $args due to the "catch" above. # set expect "\n invoked from within\n\"$cinfo" set exlen [string length $expect] set eilen [string length $errInfo] set i [expr {$eilen - $exlen - 1}] set einfo [string range $errInfo 0 $i] # # For now verify that $errInfo consists of what we are about # to return plus what we expected to trim off. # if {$errInfo ne "$einfo$expect"} { error "Tcl bug: unexpected stack trace in \"unknown\"" {} \ [list CORE UNKNOWN BADTRACE $einfo $expect $errInfo] } return -code error -errorcode $errCode \ -errorinfo $einfo $msg } else { dict incr opts -level return -options $opts $msg } } } if {([info level] == 1) && ([info script] eq "") && [info exists tcl_interactive] && $tcl_interactive} { if {![info exists auto_noexec]} { set new [auto_execok $name] if {$new ne ""} { set redir "" if {[namespace which -command console] eq ""} { set redir ">&@stdout <@stdin" } uplevel 1 [list ::catch \ [concat exec $redir $new [lrange $args 1 end]] \ ::tcl::UnknownResult ::tcl::UnknownOptions] dict incr ::tcl::UnknownOptions -level return -options $::tcl::UnknownOptions $::tcl::UnknownResult } } if {$name eq "!!"} { set newcmd [history event] } elseif {[regexp {^!(.+)$} $name -> event]} { set newcmd [history event $event] } elseif {[regexp {^\^([^^]*)\^([^^]*)\^?$} $name -> old new]} { set newcmd [history event -1] catch {regsub -all -- $old $newcmd $new newcmd} } if {[info exists newcmd]} { tclLog $newcmd history change $newcmd 0 uplevel 1 [list ::catch $newcmd \ ::tcl::UnknownResult ::tcl::UnknownOptions] dict incr ::tcl::UnknownOptions -level return -options $::tcl::UnknownOptions $::tcl::UnknownResult } set ret [catch {set candidates [info commands $name*]} msg] if {$name eq "::"} { set name "" } if {$ret != 0} { dict append opts -errorinfo \ "\n (expanding command prefix \"$name\" in unknown)" return -options $opts $msg } # Filter out bogus matches when $name contained # a glob-special char [Bug 946952] if {$name eq ""} { # Handle empty $name separately due to strangeness # in [string first] (See RFE 1243354) set cmds $candidates } else { set cmds [list] foreach x $candidates { if {[string first $name $x] == 0} { lappend cmds $x } } } if {[llength $cmds] == 1} { uplevel 1 [list ::catch [lreplace $args 0 0 [lindex $cmds 0]] \ ::tcl::UnknownResult ::tcl::UnknownOptions] dict incr ::tcl::UnknownOptions -level return -options $::tcl::UnknownOptions $::tcl::UnknownResult } if {[llength $cmds]} { return -code error "ambiguous command name \"$name\": [lsort $cmds]" } } return -code error -errorcode [list TCL LOOKUP COMMAND $name] \ "invalid command name \"$name\"" } # auto_load -- # Checks a collection of library directories to see if a procedure # is defined in one of them. If so, it sources the appropriate # library file to create the procedure. Returns 1 if it successfully # loaded the procedure, 0 otherwise. # # Arguments: # cmd - Name of the command to find and load. # namespace (optional) The namespace where the command is being used - must be # a canonical namespace as returned [namespace current] # for instance. If not given, namespace current is used. proc auto_load {cmd {namespace {}}} { global auto_index auto_path if {$namespace eq ""} { set namespace [uplevel 1 [list ::namespace current]] } set nameList [auto_qualify $cmd $namespace] # workaround non canonical auto_index entries that might be around # from older auto_mkindex versions lappend nameList $cmd foreach name $nameList { if {[info exists auto_index($name)]} { namespace eval :: $auto_index($name) # There's a couple of ways to look for a command of a given # name. One is to use # info commands $name # Unfortunately, if the name has glob-magic chars in it like * # or [], it may not match. For our purposes here, a better # route is to use # namespace which -command $name if {[namespace which -command $name] ne ""} { return 1 } } } if {![info exists auto_path]} { return 0 } if {![auto_load_index]} { return 0 } foreach name $nameList { if {[info exists auto_index($name)]} { namespace eval :: $auto_index($name) if {[namespace which -command $name] ne ""} { return 1 } } } return 0 } # auto_load_index -- # Loads the contents of tclIndex files on the auto_path directory # list. This is usually invoked within auto_load to load the index # of available commands. Returns 1 if the index is loaded, and 0 if # the index is already loaded and up to date. # # Arguments: # None. proc auto_load_index {} { variable ::tcl::auto_oldpath global auto_index auto_path if {[info exists auto_oldpath] && ($auto_oldpath eq $auto_path)} { return 0 } set auto_oldpath $auto_path # Check if we are a safe interpreter. In that case, we support only # newer format tclIndex files. set issafe [interp issafe] for {set i [expr {[llength $auto_path] - 1}]} {$i >= 0} {incr i -1} { set dir [lindex $auto_path $i] set f "" if {$issafe} { catch {source [file join $dir tclIndex]} } elseif {[catch {set f [open [file join $dir tclIndex]]}]} { continue } else { set error [catch { set id [gets $f] if {$id eq "# Tcl autoload index file, version 2.0"} { eval [read $f] } elseif {$id eq "# Tcl autoload index file: each line identifies a Tcl"} { while {[gets $f line] >= 0} { if {([string index $line 0] eq "#") \ || ([llength $line] != 2)} { continue } set name [lindex $line 0] set auto_index($name) \ "source [file join $dir [lindex $line 1]]" } } else { error "[file join $dir tclIndex] isn't a proper Tcl index file" } } msg opts] if {$f ne ""} { close $f } if {$error} { return -options $opts $msg } } } return 1 } # auto_qualify -- # # Compute a fully qualified names list for use in the auto_index array. # For historical reasons, commands in the global namespace do not have leading # :: in the index key. The list has two elements when the command name is # relative (no leading ::) and the namespace is not the global one. Otherwise # only one name is returned (and searched in the auto_index). # # Arguments - # cmd The command name. Can be any name accepted for command # invocations (Like "foo::::bar"). # namespace The namespace where the command is being used - must be # a canonical namespace as returned by [namespace current] # for instance. proc auto_qualify {cmd namespace} { # count separators and clean them up # (making sure that foo:::::bar will be treated as foo::bar) set n [regsub -all {::+} $cmd :: cmd] # Ignore namespace if the name starts with :: # Handle special case of only leading :: # Before each return case we give an example of which category it is # with the following form : # (inputCmd, inputNameSpace) -> output if {[string match ::* $cmd]} { if {$n > 1} { # (::foo::bar , *) -> ::foo::bar return [list $cmd] } else { # (::global , *) -> global return [list [string range $cmd 2 end]] } } # Potentially returning 2 elements to try : # (if the current namespace is not the global one) if {$n == 0} { if {$namespace eq "::"} { # (nocolons , ::) -> nocolons return [list $cmd] } else { # (nocolons , ::sub) -> ::sub::nocolons nocolons return [list ${namespace}::$cmd $cmd] } } elseif {$namespace eq "::"} { # (foo::bar , ::) -> ::foo::bar return [list ::$cmd] } else { # (foo::bar , ::sub) -> ::sub::foo::bar ::foo::bar return [list ${namespace}::$cmd ::$cmd] } } # auto_import -- # # Invoked during "namespace import" to make see if the imported commands # reside in an autoloaded library. If so, the commands are loaded so # that they will be available for the import links. If not, then this # procedure does nothing. # # Arguments - # pattern The pattern of commands being imported (like "foo::*") # a canonical namespace as returned by [namespace current] proc auto_import {pattern} { global auto_index # If no namespace is specified, this will be an error case if {![string match *::* $pattern]} { return } set ns [uplevel 1 [list ::namespace current]] set patternList [auto_qualify $pattern $ns] auto_load_index foreach pattern $patternList { foreach name [array names auto_index $pattern] { if {([namespace which -command $name] eq "") && ([namespace qualifiers $pattern] eq [namespace qualifiers $name])} { namespace eval :: $auto_index($name) } } } } # auto_execok -- # # Returns string that indicates name of program to execute if # name corresponds to a shell builtin or an executable in the # Windows search path, or "" otherwise. Builds an associative # array auto_execs that caches information about previous checks, # for speed. # # Arguments: # name - Name of a command. if {$tcl_platform(platform) eq "windows"} { # Windows version. # # Note that info executable doesn't work under Windows, so we have to # look for files with .exe, .com, or .bat extensions. Also, the path # may be in the Path or PATH environment variables, and path # components are separated with semicolons, not colons as under Unix. # proc auto_execok name { global auto_execs env tcl_platform if {[info exists auto_execs($name)]} { return $auto_execs($name) } set auto_execs($name) "" set shellBuiltins [list cls copy date del dir echo erase md mkdir \ mklink rd ren rename rmdir start time type ver vol] if {[info exists env(PATHEXT)]} { # Add an initial ; to have the {} extension check first. set execExtensions [split ";$env(PATHEXT)" ";"] } else { set execExtensions [list {} .com .exe .bat .cmd] } if {[string tolower $name] in $shellBuiltins} { # When this is command.com for some reason on Win2K, Tcl won't # exec it unless the case is right, which this corrects. COMSPEC # may not point to a real file, so do the check. set cmd $env(COMSPEC) if {[file exists $cmd]} { set cmd [file attributes $cmd -shortname] } return [set auto_execs($name) [list $cmd /c $name]] } if {[llength [file split $name]] != 1} { foreach ext $execExtensions { set file ${name}${ext} if {[file exists $file] && ![file isdirectory $file]} { return [set auto_execs($name) [list $file]] } } return "" } set path "[file dirname [info nameof]];.;" if {[info exists env(WINDIR)]} { set windir $env(WINDIR) } if {[info exists windir]} { if {$tcl_platform(os) eq "Windows NT"} { append path "$windir/system32;" } append path "$windir/system;$windir;" } foreach var {PATH Path path} { if {[info exists env($var)]} { append path ";$env($var)" } } foreach ext $execExtensions { unset -nocomplain checked foreach dir [split $path {;}] { # Skip already checked directories if {[info exists checked($dir)] || ($dir eq "")} { continue } set checked($dir) {} set file [file join $dir ${name}${ext}] if {[file exists $file] && ![file isdirectory $file]} { return [set auto_execs($name) [list $file]] } } } return "" } } else { # Unix version. # proc auto_execok name { global auto_execs env if {[info exists auto_execs($name)]} { return $auto_execs($name) } set auto_execs($name) "" if {[llength [file split $name]] != 1} { if {[file executable $name] && ![file isdirectory $name]} { set auto_execs($name) [list $name] } return $auto_execs($name) } foreach dir [split $env(PATH) :] { if {$dir eq ""} { set dir . } set file [file join $dir $name] if {[file executable $file] && ![file isdirectory $file]} { set auto_execs($name) [list $file] return $auto_execs($name) } } return "" } } # ::tcl::CopyDirectory -- # # This procedure is called by Tcl's core when attempts to call the # filesystem's copydirectory function fail. The semantics of the call # are that 'dest' does not yet exist, i.e. dest should become the exact # image of src. If dest does exist, we throw an error. # # Note that making changes to this procedure can change the results # of running Tcl's tests. # # Arguments: # action - "renaming" or "copying" # src - source directory # dest - destination directory proc tcl::CopyDirectory {action src dest} { set nsrc [file normalize $src] set ndest [file normalize $dest] if {$action eq "renaming"} { # Can't rename volumes. We could give a more precise # error message here, but that would break the test suite. if {$nsrc in [file volumes]} { return -code error "error $action \"$src\" to\ \"$dest\": trying to rename a volume or move a directory\ into itself" } } if {[file exists $dest]} { if {$nsrc eq $ndest} { return -code error "error $action \"$src\" to\ \"$dest\": trying to rename a volume or move a directory\ into itself" } if {$action eq "copying"} { # We used to throw an error here, but, looking more closely # at the core copy code in tclFCmd.c, if the destination # exists, then we should only call this function if -force # is true, which means we just want to over-write. So, # the following code is now commented out. # # return -code error "error $action \"$src\" to\ # \"$dest\": file already exists" } else { # Depending on the platform, and on the current # working directory, the directories '.', '..' # can be returned in various combinations. Anyway, # if any other file is returned, we must signal an error. set existing [glob -nocomplain -directory $dest * .*] lappend existing {*}[glob -nocomplain -directory $dest \ -type hidden * .*] foreach s $existing { if {[file tail $s] ni {. ..}} { return -code error "error $action \"$src\" to\ \"$dest\": file already exists" } } } } else { if {[string first $nsrc $ndest] != -1} { set srclen [expr {[llength [file split $nsrc]] - 1}] set ndest [lindex [file split $ndest] $srclen] if {$ndest eq [file tail $nsrc]} { return -code error "error $action \"$src\" to\ \"$dest\": trying to rename a volume or move a directory\ into itself" } } file mkdir $dest } # Have to be careful to capture both visible and hidden files. # We will also be more generous to the file system and not # assume the hidden and non-hidden lists are non-overlapping. # # On Unix 'hidden' files begin with '.'. On other platforms # or filesystems hidden files may have other interpretations. set filelist [concat [glob -nocomplain -directory $src *] \ [glob -nocomplain -directory $src -types hidden *]] foreach s [lsort -unique $filelist] { if {[file tail $s] ni {. ..}} { file copy -force -- $s [file join $dest [file tail $s]] } } return }


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