# search.tcl --## This demonstration script creates a collection of widgets that# allow you to load a file into a text widget, then perform searches# on that file.## RCS: @(#) $Id: search.tcl,v 1.2 1998/09/14 18:23:30 stanton Exp $if {![info exists widgetDemo]} {    error "This script should be run from the \"widget\" demo."}# textLoadFile --# This procedure below loads a file into a text widget, discarding# the previous contents of the widget. Tags for the old widget are# not affected, however.## Arguments:# w -		The window into which to load the file.  Must be a#		text widget.# file -	The name of the file to load.  Must be readable.proc textLoadFile {w file} {    set f [open $file]    $w delete 1.0 end    while {![eof $f]} {	$w insert end [read $f 10000]    }    close $f}# textSearch --# Search for all instances of a given string in a text widget and# apply a given tag to each instance found.## Arguments:# w -		The window in which to search.  Must be a text widget.# string -	The string to search for.  The search is done using#		exact matching only;  no special characters.# tag -		Tag to apply to each instance of a matching string.proc textSearch {w string tag} {    $w tag remove search 0.0 end    if {$string == ""} {	return    }    set cur 1.0    while 1 {	set cur [$w search -count length $string $cur end]	if {$cur == ""} {	    break	}	$w tag add $tag $cur "$cur + $length char"	set cur [$w index "$cur + $length char"]    }}# textToggle --# This procedure is invoked repeatedly to invoke two commands at# periodic intervals.  It normally reschedules itself after each# execution but if an error occurs (e.g. because the window was# deleted) then it doesn't reschedule itself.## Arguments:# cmd1 -	Command to execute when procedure is called.# sleep1 -	Ms to sleep after executing cmd1 before executing cmd2.# cmd2 -	Command to execute in the *next* invocation of this#		procedure.# sleep2 -	Ms to sleep after executing cmd2 before executing cmd1 again.proc textToggle {cmd1 sleep1 cmd2 sleep2} {    catch {	eval $cmd1	after $sleep1 [list textToggle $cmd2 $sleep2 $cmd1 $sleep1]    }}set w .searchcatch {destroy $w}toplevel $wwm title $w "Text Demonstration - Search and Highlight"wm iconname $w "search"positionWindow $wframe $w.buttonspack $w.buttons -side bottom -fill x -pady 2mbutton $w.buttons.dismiss -text Dismiss -command "destroy $w"button $w.buttons.code -text "See Code" -command "showCode $w"pack $w.buttons.dismiss $w.buttons.code -side left -expand 1frame $w.filelabel $w.file.label -text "File name:" -width 13 -anchor wentry $w.file.entry -width 40 -textvariable fileNamebutton $w.file.button -text "Load File" \	-command "textLoadFile $w.text \$fileName"pack $w.file.label $w.file.entry -side leftpack $w.file.button -side left -pady 5 -padx 10bind $w.file.entry <Return> "    textLoadFile $w.text \$fileName    focus $w.string.entry"focus $w.file.entryframe $w.stringlabel $w.string.label -text "Search string:" -width 13 -anchor wentry $w.string.entry -width 40 -textvariable searchStringbutton $w.string.button -text "Highlight" \	-command "textSearch $w.text \$searchString search"pack $w.string.label $w.string.entry -side leftpack $w.string.button -side left -pady 5 -padx 10bind $w.string.entry <Return> "textSearch $w.text \$searchString search"text $w.text -yscrollcommand "$w.scroll set" -setgrid truescrollbar $w.scroll -command "$w.text yview"pack $w.file $w.string -side top -fill xpack $w.scroll -side right -fill ypack $w.text -expand yes -fill both# Set up display styles for text highlighting.if {[winfo depth $w] > 1} {    textToggle "$w.text tag configure search -background \	    #ce5555 -foreground white" 800 "$w.text tag configure \	    search -background {} -foreground {}" 200} else {    textToggle "$w.text tag configure search -background \	    black -foreground white" 800 "$w.text tag configure \	    search -background {} -foreground {}" 200}$w.text insert 1.0 \{This window demonstrates how to use the tagging facilities in textwidgets to implement a searching mechanism.  First, type a file namein the top entry, then type <Return> or click on "Load File".  Thentype a string in the lower entry and type <Return> or click on"Load File".  This will cause all of the instances of the string tobe tagged with the tag "search", and it will arrange for the tag'sdisplay attributes to change to make all of the strings blink.}$w.text mark set insert 0.0set fileName ""set searchString ""