/usr/share/tcltk/tcl8.6/word.tcl is in libtcl8.6 8.6.1-4ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 | # 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]
}
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