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tcl8.5
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word.tcl
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# word.tcl -- # # This file defines various procedures for computing word boundaries in # strings. This file is primarily needed so Tk text and entry widgets behave # properly for different platforms. # # Copyright (c) 1996 by Sun Microsystems, Inc. # Copyright (c) 1998 by Scritpics Corporation. # # See the file "license.terms" for information on usage and redistribution # of this file, and for a DISCLAIMER OF ALL WARRANTIES. # The following variables are used to determine which characters are # interpreted as white space. if {$::tcl_platform(platform) eq "windows"} { # Windows style - any but a unicode space char set ::tcl_wordchars {\S} set ::tcl_nonwordchars {\s} } else { # Motif style - any unicode word char (number, letter, or underscore) set ::tcl_wordchars {\w} set ::tcl_nonwordchars {\W} } # Arrange for caches of the real matcher REs to be kept, which enables the REs # themselves to be cached for greater performance (and somewhat greater # clarity too). namespace eval ::tcl { variable WordBreakRE array set WordBreakRE {} proc UpdateWordBreakREs args { # Ignores the arguments global tcl_wordchars tcl_nonwordchars variable WordBreakRE # To keep the RE strings short... set letter $tcl_wordchars set space $tcl_nonwordchars set WordBreakRE(after) "$letter$space|$space$letter" set WordBreakRE(before) "^.*($letter$space|$space$letter)" set WordBreakRE(end) "$space*$letter+$space" set WordBreakRE(next) "$letter*$space+$letter" set WordBreakRE(previous) "$space*($letter+)$space*\$" } # Initialize the cache UpdateWordBreakREs trace add variable ::tcl_wordchars write ::tcl::UpdateWordBreakREs trace add variable ::tcl_nonwordchars write ::tcl::UpdateWordBreakREs } # tcl_wordBreakAfter -- # # This procedure returns the index of the first word boundary after the # starting point in the given string, or -1 if there are no more boundaries in # the given string. The index returned refers to the first character of the # pair that comprises a boundary. # # Arguments: # str - String to search. # start - Index into string specifying starting point. proc tcl_wordBreakAfter {str start} { variable ::tcl::WordBreakRE set result {-1 -1} regexp -indices -start $start $WordBreakRE(after) $str result return [lindex $result 1] } # tcl_wordBreakBefore -- # # This procedure returns the index of the first word boundary before the # starting point in the given string, or -1 if there are no more boundaries in # the given string. The index returned refers to the second character of the # pair that comprises a boundary. # # Arguments: # str - String to search. # start - Index into string specifying starting point. proc tcl_wordBreakBefore {str start} { variable ::tcl::WordBreakRE set result {-1 -1} regexp -indices $WordBreakRE(before) [string range $str 0 $start] result return [lindex $result 1] } # tcl_endOfWord -- # # This procedure returns the index of the first end-of-word location after a # starting index in the given string. An end-of-word location is defined to be # the first whitespace character following the first non-whitespace character # after the starting point. Returns -1 if there are no more words after the # starting point. # # Arguments: # str - String to search. # start - Index into string specifying starting point. proc tcl_endOfWord {str start} { variable ::tcl::WordBreakRE set result {-1 -1} regexp -indices -start $start $WordBreakRE(end) $str result return [lindex $result 1] } # tcl_startOfNextWord -- # # This procedure returns the index of the first start-of-word location after a # starting index in the given string. A start-of-word location is defined to # be a non-whitespace character following a whitespace character. Returns -1 # if there are no more start-of-word locations after the starting point. # # Arguments: # str - String to search. # start - Index into string specifying starting point. proc tcl_startOfNextWord {str start} { variable ::tcl::WordBreakRE set result {-1 -1} regexp -indices -start $start $WordBreakRE(next) $str result return [lindex $result 1] } # tcl_startOfPreviousWord -- # # This procedure returns the index of the first start-of-word location before # a starting index in the given string. # # Arguments: # str - String to search. # start - Index into string specifying starting point. proc tcl_startOfPreviousWord {str start} { variable ::tcl::WordBreakRE set word {-1 -1} regexp -indices $WordBreakRE(previous) [string range $str 0 $start-1] \ result word return [lindex $word 0] }
/home/sudancam/./../../usr/share/./tcl8.5/word.tcl