diff options
Diffstat (limited to 'library/init.tcl')
| -rw-r--r-- | library/init.tcl | 371 |
1 files changed, 319 insertions, 52 deletions
diff --git a/library/init.tcl b/library/init.tcl index 8b6ca1a..6c1aff9 100644 --- a/library/init.tcl +++ b/library/init.tcl @@ -3,7 +3,7 @@ # Default system startup file for Tcl-based applications. Defines # "unknown" procedure and auto-load facilities. # -# SCCS: %Z% $Id: init.tcl,v 1.8 1998/07/20 16:24:45 welch Exp $ +# SCCS: %Z% $Id: init.tcl,v 1.9 1998/07/24 13:50:06 surles Exp $ # # Copyright (c) 1991-1993 The Regents of the University of California. # Copyright (c) 1994-1996 Sun Microsystems, Inc. @@ -97,11 +97,6 @@ if {[info commands tclLog] == ""} { } } -# The procs defined in this file that have a leading space -# are 'hidden' from auto_mkindex because they are not -# auto-loadable. - - # 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 @@ -124,7 +119,7 @@ if {[info commands tclLog] == ""} { # args - A list whose elements are the words of the original # command, including the command name. - proc unknown args { +proc unknown args { global auto_noexec auto_noload env unknown_pending tcl_interactive global errorCode errorInfo @@ -251,9 +246,9 @@ if {[info commands tclLog] == ""} { # 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_oldpath auto_path env errorInfo errorCode - +proc auto_load {cmd {namespace {}}} { + global auto_index auto_oldpath auto_path + if {[string length $namespace] == 0} { set namespace [uplevel {namespace current}] } @@ -270,6 +265,34 @@ if {[info commands tclLog] == ""} { if {![info exists auto_path]} { return 0 } + + if {![auto_load_index]} { + return 0 + } + + foreach name $nameList { + if {[info exists auto_index($name)]} { + uplevel #0 $auto_index($name) + if {[info commands $name] != ""} { + return 1 + } + } + } + return 0 +} + +# auto_load_index -- +# Loads the contents of tclIndex files on the auto_path directory +# list. This is usually invoked within auto_load to load the index +# of available commands. Returns 1 if the index is loaded, and 0 if +# the index is already loaded and up to date. +# +# Arguments: +# None. + +proc auto_load_index {} { + global auto_index auto_oldpath auto_path errorInfo errorCode + if {[info exists auto_oldpath]} { if {$auto_oldpath == $auto_path} { return 0 @@ -317,15 +340,7 @@ if {[info commands tclLog] == ""} { } } } - foreach name $nameList { - if {[info exists auto_index($name)]} { - uplevel #0 $auto_index($name) - if {[info commands $name] != ""} { - return 1 - } - } - } - return 0 + return 1 } # auto_qualify -- @@ -342,8 +357,8 @@ if {[info commands tclLog] == ""} { # a canonical namespace as returned by [namespace current] # for instance. - proc auto_qualify {cmd namespace} { - +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] @@ -387,6 +402,33 @@ if {[info commands tclLog] == ""} { } } +# 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 + + set ns [uplevel namespace current] + set patternList [auto_qualify $pattern $ns] + + auto_load_index + + foreach pattern $patternList { + foreach name [array names auto_index] { + if {[string match $pattern $name] && "" == [info commands $name]} { + uplevel #0 $auto_index($name) + } + } + } +} + if {[string compare $tcl_platform(platform) windows] == 0} { # auto_execok -- @@ -523,13 +565,31 @@ proc auto_reset {} { catch {unset auto_oldpath} } +# ---------------------------------------------------------------------- +# auto_mkindex +# ---------------------------------------------------------------------- +# The following procedures are used to generate the tclIndex file +# from Tcl source files. They use a special safe interpreter to +# parse Tcl source files, writing out index entries as "proc" +# commands are encountered. This implementation won't work in a +# safe interpreter, since a safe interpreter can't create the +# special parser and mess with its commands. If this is a safe +# interpreter, we simply clip these procs out. + +if {[interp issafe]} { + proc auto_mkindex {dir args} { + error "can't generate index within safe interpreter" + } + proc tcl_nonsafe {args} {} +} else { + proc tcl_nonsafe {args} {eval $args} +} + # auto_mkindex -- # Regenerate a tclIndex file from Tcl source files. Takes as argument # the name of the directory in which the tclIndex file is to be placed, # followed by any number of glob patterns to use in that directory to -# locate all of the relevant files. It does not parse or source the file -# so the generated index will not contain the appropriate namespace qualifiers -# if you don't explicitly specify it. +# locate all of the relevant files. # # Arguments: # dir - Name of the directory in which to create an index. @@ -537,11 +597,17 @@ proc auto_reset {} { # names of files within dir. If no additional # are given auto_mkindex will look for *.tcl. -proc auto_mkindex {dir args} { +tcl_nonsafe proc auto_mkindex {dir args} { global errorCode errorInfo + + if {[interp issafe]} { + error "can't generate index within safe interpreter" + } + set oldDir [pwd] cd $dir set dir [pwd] + append index "# Tcl autoload index file, version 2.0\n" append index "# This file is generated by the \"auto_mkindex\" command\n" append index "# and sourced to set up indexing information for one or\n" @@ -553,42 +619,243 @@ proc auto_mkindex {dir args} { set args *.tcl } foreach file [eval glob $args] { - set f "" - set error [catch { - set f [open $file] - while {[gets $f line] >= 0} { - if {[regexp {^proc[ ]+([^ ]*)} $line match procName]} { - set procName [lindex [auto_qualify $procName "::"] 0] - append index "set [list auto_index($procName)]" - append index " \[list source \[file join \$dir [list $file]\]\]\n" - } - } - close $f - } msg] - if {$error} { + if {[catch {auto_mkindex_parser::mkindex $file} msg] == 0} { + append index $msg + } else { set code $errorCode set info $errorInfo - catch {close $f} cd $oldDir error $msg $info $code } } - set f "" - set error [catch { - set f [open tclIndex w] - puts $f $index nonewline - close $f - cd $oldDir - } msg] - if {$error} { - set code $errorCode - set info $errorInfo - catch {close $f} - cd $oldDir - error $msg $info $code + + set fid [open "tclIndex" w] + puts $fid $index nonewline + close $fid + cd $oldDir +} + +# +# Create a safe interpreter that can be used to parse Tcl source files +# generate a tclIndex file for autoloading. This interp contains +# commands for things that need index entries. Each time a command +# is executed, it writes an entry out to the index file. +# +tcl_nonsafe namespace eval auto_mkindex_parser { + variable parser "" ;# parser used to build index + variable index "" ;# maintains index as it is built + variable scriptFile "" ;# name of file being processed + variable contextStack "" ;# stack of namespace scopes + variable imports "" ;# keeps track of all imported cmds + + if {![interp issafe]} { + set parser [interp create -safe] + $parser hide info + $parser hide rename + $parser hide proc + $parser hide namespace + $parser hide eval + $parser hide puts + $parser invokehidden namespace delete :: + $parser invokehidden proc unknown {args} {} + + # + # We'll need access to the "namespace" command within the + # interp. Put it back, but move it out of the way. + # + $parser expose namespace + $parser invokehidden rename namespace _%@namespace + $parser expose eval + $parser invokehidden rename eval _%@eval + } +} + +# 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. +# +tcl_nonsafe 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. + # Be careful to escape all naked "$" before evaluating. + # + regsub -all {([^\$])\$([^\$])} $contents {\1\\$\2} 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::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. +# +tcl_nonsafe proc auto_mkindex_parser::command {name arglist body} { + variable parser + + set ns [namespace qualifiers $name] + set tail [namespace tail $name] + if {$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] + 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. +# +tcl_nonsafe 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 {[namespace qualifiers $name] == ""} { + return [namespace tail $name] + } elseif {![string match ::* $name]} { + return "::$name" + } + return $name } +# +# Now define 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. +# +tcl_nonsafe auto_mkindex_parser::command proc {name args} { + variable index + variable scriptFile + append index "set [list auto_index([fullname $name])]" + append index " \[list source \[file join \$dir [list $scriptFile]\]\]\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. +# +tcl_nonsafe 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] + if {[llength $args] == 1} { + $parser eval [lindex $args 0] + } else { + eval $parser eval $args + } + set contextStack [lrange $contextStack 1 end] + } + import { + variable parser + variable imports + foreach pattern $args { + if {$pattern != "-force"} { + lappend imports $pattern + } + } + catch {$parser eval "_%@namespace import $args"} + } + } +} + +rename tcl_nonsafe "" + # pkg_mkIndex -- # This procedure creates a package index in a given directory. The # package index consists of a "pkgIndex.tcl" file whose contents are |