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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 96/11/20 14:07:22
+# 
+# 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
+}