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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.
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
#
# SCCS: @(#) word.tcl 1.2 98/06/27 18:11:26
#
# 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) == "windows"} {
# Windows style - any but space, tab, or newline
set tcl_wordchars "\[^ \t\n\]"
set tcl_nonwordchars "\[ \t\n\]"
} else {
# Motif style - any number, letter, or underscore
set tcl_wordchars {[a-zA-Z0-9_]}
set tcl_nonwordchars {[^a-zA-Z0-9_]}
}
# 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} {
global tcl_nonwordchars tcl_wordchars
set str [string range $str $start end]
if {[regexp -indices "$tcl_wordchars$tcl_nonwordchars|$tcl_nonwordchars$tcl_wordchars" $str result]} {
return [expr {[lindex $result 1] + $start}]
}
return -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} {
global tcl_nonwordchars tcl_wordchars
if {[string compare $start end] == 0} {
set start [string length $str]
}
if {[regexp -indices "^.*($tcl_wordchars$tcl_nonwordchars|$tcl_nonwordchars$tcl_wordchars)" [string range $str 0 $start] result]} {
return [lindex $result 1]
}
return -1
}
# tcl_endOfWord --
#
# This procedure returns the index of the first end-of-word location
# after a starting index in the given string. An end-of-word location
# is defined to be the first whitespace character following the first
# non-whitespace character after the starting point. Returns -1 if
# there are no more words after the starting point.
#
# Arguments:
# str - String to search.
# start - Index into string specifying starting point.
proc tcl_endOfWord {str start} {
global tcl_nonwordchars tcl_wordchars
if {[regexp -indices "$tcl_nonwordchars*$tcl_wordchars+$tcl_nonwordchars" \
[string range $str $start end] result]} {
return [expr {[lindex $result 1] + $start}]
}
return -1
}
# tcl_startOfNextWord --
#
# This procedure returns the index of the first start-of-word location
# after a starting index in the given string. A start-of-word
# location is defined to be a non-whitespace character following a
# whitespace character. Returns -1 if there are no more start-of-word
# locations after the starting point.
#
# Arguments:
# str - String to search.
# start - Index into string specifying starting point.
proc tcl_startOfNextWord {str start} {
global tcl_nonwordchars tcl_wordchars
if {[regexp -indices "$tcl_wordchars*$tcl_nonwordchars+$tcl_wordchars" \
[string range $str $start end] result]} {
return [expr {[lindex $result 1] + $start}]
}
return -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} {
global tcl_nonwordchars tcl_wordchars
if {[string compare $start end] == 0} {
set start [string length $str]
}
if {[regexp -indices \
"$tcl_nonwordchars*($tcl_wordchars+)$tcl_nonwordchars*\$" \
[string range $str 0 [expr {$start - 1}]] result word]} {
return [lindex $word 0]
}
return -1
}
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