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projman/html_lib.tcl

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Initial release
2015-10-19 13:27:31 +03:00
# Simple HTML display library by Stephen Uhler (stephen.uhler@sun.com)
# Copyright (c) 1995 by Sun Microsystems
# Version 0.3 Fri Sep 1 10:47:17 PDT 1995
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
#
# To use this package, create a text widget (say, .text)
# and set a variable full of html, (say $html), and issue:
# HM::init_win .text
# HM::parse_html $html "HM::render .text"
# You also need to supply the routine:
# proc HM::link_callback {win href} { ...}
# win: The name of the text widget
# href The name of the link
# which will be called anytime the user "clicks" on a link.
# !!! Use HM::set_link_callback !!!
# The supplied version just prints the link to stdout.
# In addition, if you wish to use embedded images, you will need to write
# proc HM::set_image {handle src}
# handle an arbitrary handle (not really)
# src The name of the image
# Which calls
# HM::got_image $handle $image
# with the TK image.
#
# To return a "used" text widget to its initialized state, call:
# HM::reset_win .text
# See "sample.tcl" for sample usage
##################################################################
############################################
# mapping of html tags to text tag properties
# properties beginning with "T" map directly to text tags
namespace eval HM {
}
# These are Defined in HTML 2.0
proc HM::init_array {} {
global HM::tag_map HM::insert_map HM::list_elements HM::param_map
global HM::events HM::esc_map HM::form_map HM::proc_link_callback
array set HM::tag_map {
b {weight bold}
blockquote {style i indent 1 Trindent rindent}
bq {style i indent 1 Trindent rindent}
cite {style i}
code {family courier}
dfn {style i}
dir {indent 1}
dl {indent 1}
em {style i}
h1 {size 24 weight bold}
h2 {size 22}
h3 {size 20}
h4 {size 18}
h5 {size 16}
h6 {style i}
i {style i}
kbd {family courier weight bold}
menu {indent 1}
ol {indent 1}
pre {fill 0 family courier Tnowrap nowrap}
samp {family courier}
strong {weight bold}
tt {family courier}
u {Tunderline underline}
ul {indent 1}
var {style i}
}
# These are in common(?) use, but not defined in html2.0
array set HM::tag_map {
center {Tcenter center}
strike {Tstrike strike}
u {Tunderline underline}
}
# initial values
set HM::tag_map(hmstart) {
family times weight medium style r size 14
Tcenter "" Tlink "" Tnowrap "" Tunderline "" list list
fill 1 indent "" counter 0 adjust 0
}
# html tags that insert white space
array set HM::insert_map {
blockquote "\n\n" /blockquote "\n"
br "\n"
dd "\n" /dd "\n"
dl "\n" /dl "\n"
dt "\n"
form "\n" /form "\n"
h1 "\n\n" /h1 "\n"
h2 "\n\n" /h2 "\n"
h3 "\n\n" /h3 "\n"
h4 "\n" /h4 "\n"
h5 "\n" /h5 "\n"
h6 "\n" /h6 "\n"
li "\n"
/dir "\n"
/ul "\n"
/ol "\n"
/menu "\n"
p "\n\n"
pre "\n" /pre "\n"
}
# tags that are list elements, that support "compact" rendering
array set HM::list_elements {
ol 1 ul 1 menu 1 dl 1 dir 1
}
# alter the parameters of the text state
# this allows an application to over-ride the default settings
# it is called as: HM::set_state -param value -param value ...
array set HM::param_map {
-update S_update
-tab S_tab
-unknown S_unknown
-stop S_stop
-size S_adjust_size
-symbols S_symbols
-insert S_insert
}
array set HM::events {
Enter {-borderwidth 2 -relief flat -underline 1}
Leave {-borderwidth 2 -relief flat -underline 0}
1 {-borderwidth 2 -relief sunken}
ButtonRelease-1 {-borderwidth 2 -relief flat}
}
# table of escape characters (ISO latin-1 esc's are in a different table)
array set HM::esc_map {
lt < gt > amp & quot \" copy \xa9
reg \xae ob \x7b cb \x7d nbsp \xa0
}
#############################################################
# ISO Latin-1 escape codes
array set HM::esc_map {
nbsp \xa0 iexcl \xa1 cent \xa2 pound \xa3 curren \xa4
yen \xa5 brvbar \xa6 sect \xa7 uml \xa8 copy \xa9
ordf \xaa laquo \xab not \xac shy \xad reg \xae
hibar \xaf deg \xb0 plusmn \xb1 sup2 \xb2 sup3 \xb3
acute \xb4 micro \xb5 para \xb6 middot \xb7 cedil \xb8
sup1 \xb9 ordm \xba raquo \xbb frac14 \xbc frac12 \xbd
frac34 \xbe iquest \xbf Agrave \xc0 Aacute \xc1 Acirc \xc2
Atilde \xc3 Auml \xc4 Aring \xc5 AElig \xc6 Ccedil \xc7
Egrave \xc8 Eacute \xc9 Ecirc \xca Euml \xcb Igrave \xcc
Iacute \xcd Icirc \xce Iuml \xcf ETH \xd0 Ntilde \xd1
Ograve \xd2 Oacute \xd3 Ocirc \xd4 Otilde \xd5 Ouml \xd6
times \xd7 Oslash \xd8 Ugrave \xd9 Uacute \xda Ucirc \xdb
Uuml \xdc Yacute \xdd THORN \xde szlig \xdf agrave \xe0
aacute \xe1 acirc \xe2 atilde \xe3 auml \xe4 aring \xe5
aelig \xe6 ccedil \xe7 egrave \xe8 eacute \xe9 ecirc \xea
euml \xeb igrave \xec iacute \xed icirc \xee iuml \xef
eth \xf0 ntilde \xf1 ograve \xf2 oacute \xf3 ocirc \xf4
otilde \xf5 ouml \xf6 divide \xf7 oslash \xf8 ugrave \xf9
uacute \xfa ucirc \xfb uuml \xfc yacute \xfd thorn \xfe
yuml \xff
}
##########################################################
# html forms management commands
# As each form element is located, it is created and rendered. Additional
# state is stored in a form specific global variable to be processed at
# the end of the form, including the "reset" and "submit" options.
# Remember, there can be multiple forms existing on multiple pages. When
# HTML tables are added, a single form could be spread out over multiple
# text widgets, which makes it impractical to hang the form state off the
# HM::$win structure. We don't need to check for the existance of required
# parameters, we just "fail" and get caught in HM::render
# This causes line breaks to be preserved in the inital values
# of text areas
array set HM::tag_map {
textarea {fill 0}
}
# These are handled specially
array set HM::form_map {
" " + \n %0d%0a
}
}
############################################
# initialize the window and stack state
proc HM::init_win {win} {
HM::init_array
upvar #0 HM::$win var
HM::init_state $win
$win tag configure underline -underline 1
$win tag configure center -justify center
$win tag configure nowrap -wrap none
$win tag configure rindent -rmargin $var(S_tab)c
$win tag configure strike -overstrike 1
$win tag configure mark -foreground red ;# list markers
$win tag configure list -spacing1 3p -spacing3 3p ;# regular lists
$win tag configure compact -spacing1 0p ;# compact lists
$win tag configure link -borderwidth 0 -foreground blue;# hypertext links
HM::set_indent $win $var(S_tab)
$win configure -wrap word
# configure the text insertion point
$win mark set $var(S_insert) 1.0
# for horizontal rules
$win tag configure thin -font [HM::x_font times 2 medium r]
$win tag configure hr -relief sunken -borderwidth 2 -wrap none \
-tabs [winfo width $win]
bind $win <Configure> {
%W tag configure hr -tabs %w
%W tag configure last -spacing3 %h
}
# generic link enter callback
$win tag bind link <1> "HM::link_hit $win %x %y"
}
proc HM::set_link_callback {name} {
global HM::proc_link_callback
set HM::proc_link_callback $name
}
# set the indent spacing (in cm) for lists
# TK uses a "weird" tabbing model that causes \t to insert a single
# space if the current line position is past the tab setting
proc HM::set_indent {win cm} {
set tabs [expr $cm / 2.0]
$win configure -tabs ${tabs}c
foreach i {1 2 3 4 5 6 7 8 9} {
set tab [expr $i * $cm]
$win tag configure indent$i -lmargin1 ${tab}c -lmargin2 ${tab}c \
-tabs "[expr $tab + $tabs]c [expr $tab + 2*$tabs]c"
}
}
# reset the state of window - get ready for the next page
# remove all but the font tags, and remove all form state
proc HM::reset_win {win} {
upvar #0 HM::$win var
regsub -all { +[^L ][^ ]*} " [$win tag names] " {} tags
catch "$win tag delete $tags"
eval $win mark unset [$win mark names]
$win delete 0.0 end
$win tag configure hr -tabs [winfo width $win]
# configure the text insertion point
$win mark set $var(S_insert) 1.0
# remove form state. If any check/radio buttons still exists,
# their variables will be magically re-created, and never get
# cleaned up.
catch unset [info globals HM::$win.form*]
HM::init_state $win
return HM::$win
}
# initialize the window's state array
# Parameters beginning with S_ are NOT reset
# adjust_size: global font size adjuster
# unknown: character to use for unknown entities
# tab: tab stop (in cm)
# stop: enabled to stop processing
# update: how many tags between update calls
# tags: number of tags processed so far
# symbols: Symbols to use on un-ordered lists
proc HM::init_state {win} {
upvar #0 HM::$win var
array set tmp [array get var S_*]
catch {unset var}
array set var {
stop 0
tags 0
fill 0
list list
S_adjust_size 0
S_tab 1.0
S_unknown \xb7
S_update 10
S_symbols O*=+-o\xd7\xb0>:\xb7
S_insert Insert
}
array set var [array get tmp]
}
proc HM::set_state {win args} {
upvar #0 HM::$win var
global HM::param_map
set bad 0
if {[catch {array set params $args}]} {return 0}
foreach i [array names params] {
incr bad [catch {set var($HM::param_map($i)) $params($i)}]
}
return [expr $bad == 0]
}
############################################
# manage the display of html
# HM::render gets called for every html tag
# win: The name of the text widget to render into
# tag: The html tag (in arbitrary case)
# not: a "/" or the empty string
# param: The un-interpreted parameter list
# text: The plain text until the next html tag
proc HM::render {win tag not param text} {
upvar #0 HM::$win var
if {$var(stop)} return
global HM::tag_map HM::insert_map HM::list_elements
set tag [string tolower $tag]
set text [HM::map_esc $text]
# manage compact rendering of lists
if {[info exists HM::list_elements($tag)]} {
set list "list [expr {[HM::extract_param $param compact] ? "compact" : "list"}]"
} else {
set list ""
}
# Allow text to be diverted to a different window (for tables)
# this is not currently used
if {[info exists var(divert)]} {
set win $var(divert)
upvar #0 HM::$win var
}
# adjust (push or pop) tag state
catch {HM::stack $win $not "$HM::tag_map($tag) $list"}
# insert white space (with current font)
# adding white space can get a bit tricky. This isn't quite right
set bad [catch {$win insert $var(S_insert) $HM::insert_map($not$tag) "space $var(font)"}]
if {!$bad && [lindex $var(fill) end]} {
set text [string trimleft $text]
}
# to fill or not to fill
if {[lindex $var(fill) end]} {
set text [HM::zap_white $text]
}
# generic mark hook
catch {HM::mark $not$tag $win $param text} err
# do any special tag processing
catch {HM::tag_$not$tag $win $param text} msg
# add the text with proper tags
set tags [HM::current_tags $win]
$win insert $var(S_insert) $text $tags
# We need to do an update every so often to insure interactive response.
# This can cause us to re-enter the event loop, and cause recursive
# invocations of HM::render, so we need to be careful.
if {!([incr var(tags)] % $var(S_update))} {
update
}
}
# html tags requiring special processing
# Procs of the form HM::tag_<tag> or HM::tag_</tag> get called just before
# the text for this tag is displayed. These procs are called inside a
# "catch" so it is OK to fail.
# win: The name of the text widget to render into
# param: The un-interpreted parameter list
# text: A pass-by-reference name of the plain text until the next html tag
# Tag commands may change this to affect what text will be inserted
# next.
# A pair of pseudo tags are added automatically as the 1st and last html
# tags in the document. The default is <HM::start> and </HM::start>.
# Append enough blank space at the end of the text widget while
# rendering so HM::goto can place the target near the top of the page,
# then remove the extra space when done rendering.
proc HM::tag_hmstart {win param text} {
upvar #0 HM::$win var
$win mark gravity $var(S_insert) left
$win insert end "\n " last
$win mark gravity $var(S_insert) right
}
proc HM::tag_/hmstart {win param text} {
$win delete last.first end
}
# put the document title in the window banner, and remove the title text
# from the document
proc HM::tag_title {win param text} {
upvar $text data
wm title [winfo toplevel $win] $data
set data ""
}
proc HM::tag_hr {win param text} {
upvar #0 HM::$win var
$win insert $var(S_insert) "\n" space "\n" thin "\t" "thin hr" "\n" thin
}
# list element tags
proc HM::tag_ol {win param text} {
upvar #0 HM::$win var
set var(count$var(level)) 0
}
proc HM::tag_ul {win param text} {
upvar #0 HM::$win var
catch {unset var(count$var(level))}
}
proc HM::tag_menu {win param text} {
upvar #0 HM::$win var
set var(menu) ->
set var(compact) 1
}
proc HM::tag_/menu {win param text} {
upvar #0 HM::$win var
catch {unset var(menu)}
catch {unset var(compact)}
}
proc HM::tag_dt {win param text} {
upvar #0 HM::$win var
upvar $text data
set level $var(level)
incr level -1
$win insert $var(S_insert) "$data" \
"hi [lindex $var(list) end] indent$level $var(font)"
set data {}
}
proc HM::tag_li {win param text} {
upvar #0 HM::$win var
set level $var(level)
incr level -1
set x [string index $var(S_symbols)+-+-+-+-" $level]
catch {set x [incr var(count$level)]}
catch {set x $var(menu)}
$win insert $var(S_insert) \t$x\t "mark [lindex $var(list) end] indent$level $var(font)"
}
# Manage hypertext "anchor" links. A link can be either a source (href)
# a destination (name) or both. If its a source, register it via a callback,
# and set its default behavior. If its a destination, check to see if we need
# to go there now, as a result of a previous HM::goto request. If so, schedule
# it to happen with the closing </a> tag, so we can highlight the text up to
# the </a>.
proc HM::tag_a {win param text} {
upvar #0 HM::$win var
# a source
if {[HM::extract_param $param href]} {
set var(Tref) [list L:$href]
HM::stack $win "" "Tlink link"
HM::link_setup $win $href
}
# a destination
if {[HM::extract_param $param name]} {
set var(Tname) [list N:$name]
HM::stack $win "" "Tanchor anchor"
$win mark set N:$name "$var(S_insert) - 1 chars"
$win mark gravity N:$name left
if {[info exists var(goto)] && $var(goto) == $name} {
unset var(goto)
set var(going) $name
}
}
}
# The application should call here with the fragment name
# to cause the display to go to this spot.
# If the target exists, go there (and do the callback),
# otherwise schedule the goto to happen when we see the reference.
proc HM::goto {win where {callback HM::went_to}} {
upvar #0 HM::$win var
if {[regexp N:$where [$win mark names]]} {
$win see N:$where
update
eval $callback $win [list $where]
return 1
} else {
set var(goto) $where
return 0
}
}
# We actually got to the spot, so highlight it!
# This should/could be replaced by the application
# We'll flash it orange a couple of times.
proc HM::went_to {win where {count 0} {color orange}} {
upvar #0 HM::$win var
if {$count > 5} return
catch {$win tag configure N:$where -foreground $color}
update
after 200 [list HM::went_to $win $where [incr count] \
[expr {$color=="orange" ? "" : "orange"}]]
}
proc HM::tag_/a {win param text} {
upvar #0 HM::$win var
if {[info exists var(Tref)]} {
unset var(Tref)
HM::stack $win / "Tlink link"
}
# goto this link, then invoke the call-back.
if {[info exists var(going)]} {
$win yview N:$var(going)
update
HM::went_to $win $var(going)
unset var(going)
}
if {[info exists var(Tname)]} {
unset var(Tname)
HM::stack $win / "Tanchor anchor"
}
}
# Inline Images
# This interface is subject to change
# Most of the work is getting around a limitation of TK that prevents
# setting the size of a label to a widthxheight in pixels
#
# Images have the following parameters:
# align: top,middle,bottom
# alt: alternate text
# ismap: A clickable image map
# src: The URL link
# Netscape supports (and so do we)
# width: A width hint (in pixels)
# height: A height hint (in pixels)
# border: The size of the window border
proc HM::tag_img {win param text} {
upvar #0 HM::$win var
# get alignment
array set align_map {top top middle center bottom bottom}
set align bottom ;# The spec isn't clear what the default should be
HM::extract_param $param align
catch {set align $align_map([string tolower $align])}
# get alternate text
set alt "<image>"
HM::extract_param $param alt
set alt [HM::map_esc $alt]
# get the border width
set border 1
HM::extract_param $param border
# see if we have an image size hint
# If so, make a frame the "hint" size to put the label in
# otherwise just make the label
set item $win.$var(tags)
# catch {destroy $item}
if {[HM::extract_param $param width] && [HM::extract_param $param height]} {
frame $item -width $width -height $height
pack propagate $item 0
set label $item.label
label $label
pack $label -expand 1 -fill both
} else {
set label $item
label $label
}
$label configure -relief ridge -fg orange -text $alt
catch {$label configure -bd $border}
$win window create $var(S_insert) -align $align -window $item -pady 2 -padx 2
# add in all the current tags (this is overkill)
set tags [HM::current_tags $win]
foreach tag $tags {
$win tag add $tag $item
}
# set imagemap callbacks
if {[HM::extract_param $param ismap]} {
# regsub -all {[^L]*L:([^ ]*).*} $tags {\1} link
set link [lindex $tags [lsearch -glob $tags L:*]]
regsub L: $link {} link
global HM::events
regsub -all {%} $link {%%} link2
foreach i [array names HM::events] {
bind $label <$i> "catch \{%W configure $HM::events($i)\}"
}
bind $label <1> "+HM::link_callback $win $link2?%x,%y"
}
# now callback to the application
set src ""
HM::extract_param $param src
HM::set_image $win $label $src
return $label ;# used by the forms package for input_image types
}
# The app needs to supply one of these
proc HM::set_image {win handle src} {
HM::got_image $handle "can't get\n$src"
}
# When the image is available, the application should call back here.
# If we have the image, put it in the label, otherwise display the error
# message. If we don't get a callback, the "alt" text remains.
# if we have a clickable image, arrange for a callback
proc HM::got_image {win image_error} {
# if we're in a frame turn on geometry propogation
if {[winfo name $win] == "label"} {
pack propagate [winfo parent $win] 1
}
if {[catch {$win configure -image $image_error}]} {
$win configure -image {}
$win configure -text $image_error
}
}
# Sample hypertext link callback routine - should be replaced by app
# This proc is called once for each <A> tag.
# Applications can overwrite this procedure, as required, or
# replace the HM::events array
# win: The name of the text widget to render into
# href: The HREF link for this <a> tag.
# We need to escape any %'s in the href tag name so the bind command
# doesn't try to substitute them.
proc HM::link_setup {win href} {
global HM::events
regsub -all {%} $href {%%} href2
foreach i [array names HM::events] {
eval {$win tag bind L:$href <$i>} \
\{$win tag configure \{L:$href2\} $HM::events($i)\}
}
}
# generic link-hit callback
# This gets called upon button hits on hypertext links
# Applications are expected to supply ther own HM::link_callback routine
# win: The name of the text widget to render into
# x,y: The cursor position at the "click"
proc HM::link_hit {win x y} {
set tags [$win tag names @$x,$y]
set link [lindex $tags [lsearch -glob $tags L:*]]
# regsub -all {[^L]*L:([^ ]*).*} $tags {\1} link
regsub L: $link {} link
HM::link_callback $win $link
}
# replace this!
# win: The name of the text widget to render into
# href: The HREF link for this <a> tag.
proc HM::link_callback {win href} {
if {$HM::proc_link_callback != ""} {
$HM::proc_link_callback $win $href
}
}
# extract a value from parameter list (this needs a re-do)
# returns "1" if the keyword is found, "0" otherwise
# param: A parameter list. It should alredy have been processed to
# remove any entity references
# key: The parameter name
# val: The variable to put the value into (use key as default)
proc HM::extract_param {param key {val ""}} {
if {$val == ""} {
upvar $key result
} else {
upvar $val result
}
set ws " \n\r"
# look for name=value combinations. Either (') or (") are valid delimeters
if {
[regsub -nocase [format {.*%s[%s]*=[%s]*"([^"]*).*} $key $ws $ws] $param {\1} value] ||
[regsub -nocase [format {.*%s[%s]*=[%s]*'([^']*).*} $key $ws $ws] $param {\1} value] ||
[regsub -nocase [format {.*%s[%s]*=[%s]*([^%s]+).*} $key $ws $ws $ws] $param {\1} value] } {
set result $value
return 1
}
# now look for valueless names
# I should strip out name=value pairs, so we don't end up with "name"
# inside the "value" part of some other key word - some day
set bad \[^a-zA-Z\]+
if {[regexp -nocase "$bad$key$bad" -$param-]} {
return 1
} else {
return 0
}
}
# These next two routines manage the display state of the page.
# Push or pop tags to/from stack.
# Each orthogonal text property has its own stack, stored as a list.
# The current (most recent) tag is the last item on the list.
# Push is {} for pushing and {/} for popping
proc HM::stack {win push list} {
upvar #0 HM::$win var
array set tags $list
if {$push == ""} {
foreach tag [array names tags] {
lappend var($tag) $tags($tag)
}
} else {
foreach tag [array names tags] {
# set cnt [regsub { *[^ ]+$} $var($tag) {} var($tag)]
set var($tag) [lreplace $var($tag) end end]
}
}
}
# extract set of current text tags
# tags starting with T map directly to text tags, all others are
# handled specially. There is an application callback, HM::set_font
# to allow the application to do font error handling
proc HM::current_tags {win} {
upvar #0 HM::$win var
set font font
foreach i {family size weight style} {
set $i [lindex $var($i) end]
append font :[set $i]
}
set xfont [HM::x_font $family $size $weight $style $var(S_adjust_size)]
HM::set_font $win $font $xfont
set indent [llength $var(indent)]
incr indent -1
lappend tags $font indent$indent
foreach tag [array names var T*] {
lappend tags [lindex $var($tag) end] ;# test
}
set var(font) $font
set var(xfont) [$win tag cget $font -font]
set var(level) $indent
return $tags
}
# allow the application to do do better font management
# by overriding this procedure
proc HM::set_font {win tag font} {
catch {$win tag configure $tag -font $font} msg
}
# generate an X font name
proc HM::x_font {family size weight style {adjust_size 0}} {
catch {incr size $adjust_size}
return "-*-$family-$weight-$style-normal-*-*-${size}0-*-*-*-*-*-*"
}
# Optimize HM::render (hee hee)
# This is experimental
proc HM::optimize {} {
regsub -all "\n\[ \]*#\[^\n\]*" [info body HM::render] {} body
regsub -all ";\[ \]*#\[^\n]*" $body {} body
regsub -all "\n\n+" $body \n body
proc HM::render {win tag not param text} $body
}
############################################
# Turn HTML into TCL commands
# html A string containing an html document
# cmd A command to run for each html tag found
# start The name of the dummy html start/stop tags
proc HM::parse_html {html {cmd HM::test_parse} {start hmstart}} {
regsub -all \{ $html {\&ob;} html
regsub -all \} $html {\&cb;} html
set w " \t\r\n" ;# white space
proc cl x {return "\[$x\]"}
set exp <(/?)([HM::cl ^$w>]+)[HM::cl $w]*([HM::cl ^>]*)>
set sub "\}\n$cmd {\\2} {\\1} {\\3} \{"
regsub -all $exp $html $sub html
eval "$cmd {$start} {} {} \{ $html \}"
eval "$cmd {$start} / {} {}"
}
proc HM::test_parse {command tag slash text_after_tag} {
puts "==> $command $tag $slash $text_after_tag"
}
# Convert multiple white space into a single space
proc HM::zap_white {data} {
regsub -all "\[ \t\r\n\]+" $data " " data
return $data
}
# find HTML escape characters of the form &xxx;
proc HM::map_esc {text} {
if {![regexp & $text]} {return $text}
regsub -all {([][$\\])} $text {\\\1} new
regsub -all {&#([0-9][0-9]?[0-9]?);?} \
$new {[format %c [scan \1 %d tmp;set tmp]]} new
regsub -all {&([a-zA-Z]+);?} $new {[HM::do_map \1]} new
return [subst $new]
}
# convert an HTML escape sequence into character
proc HM::do_map {text {unknown ?}} {
global HM::esc_map
set result $unknown
catch {set result $HM::esc_map($text)}
return $result
}
##########################################################
# html isindex tag. Although not strictly forms, they're close enough
# to be in this file
# is-index forms
# make a frame with a label, entry, and submit button
proc HM::tag_isindex {win param text} {
upvar #0 HM::$win var
set item $win.$var(tags)
if {[winfo exists $item]} {
destroy $item
}
frame $item -relief ridge -bd 3
set prompt "Enter search keywords here"
HM::extract_param $param prompt
label $item.label -text [HM::map_esc $prompt] -font $var(xfont)
entry $item.entry
bind $item.entry <Return> "$item.submit invoke"
button $item.submit -text search -font $var(xfont) -command \
[format {HM::submit_index %s {%s} [HM::map_reply [%s get]]} \
$win $param $item.entry]
pack $item.label -side top
pack $item.entry $item.submit -side left
# insert window into text widget
$win insert $var(S_insert) \n isindex
HM::win_install $win $item
$win insert $var(S_insert) \n isindex
bind $item <Visibility> {focus %W.entry}
}
# This is called when the isindex form is submitted.
# The default version calls HM::link_callback. Isindex tags should either
# be deprecated, or fully supported (e.g. they need an href parameter)
proc HM::submit_index {win param text} {
HM::link_callback $win ?$text
}
# initialize form state. All of the state for this form is kept
# in a global array whose name is stored in the form_id field of
# the main window array.
# Parameters: ACTION, METHOD, ENCTYPE
proc HM::tag_form {win param text} {
upvar #0 HM::$win var
# create a global array for the form
set id HM::$win.form$var(tags)
upvar #0 $id form
# missing /form tag, simulate it
if {[info exists var(form_id)]} {
puts "Missing end-form tag !!!! $var(form_id)"
HM::tag_/form $win {} {}
}
catch {unset form}
set var(form_id) $id
set form(param) $param ;# form initial parameter list
set form(reset) "" ;# command to reset the form
set form(reset_button) "" ;# list of all reset buttons
set form(submit) "" ;# command to submit the form
set form(submit_button) "" ;# list of all submit buttons
}
# Where we're done try to get all of the state into the widgets so
# we can free up the form structure here. Unfortunately, we can't!
proc HM::tag_/form {win param text} {
upvar #0 HM::$win var
upvar #0 $var(form_id) form
# make submit button entries for all radio buttons
foreach name [array names form radio_*] {
regsub radio_ $name {} name
lappend form(submit) [list $name \$form(radio_$name)]
}
# process the reset button(s)
foreach item $form(reset_button) {
$item configure -command $form(reset)
}
# no submit button - add one
if {$form(submit_button) == ""} {
HM::input_submit $win {}
}
# process the "submit" command(s)
# each submit button could have its own name,value pair
foreach item $form(submit_button) {
set submit $form(submit)
catch {lappend submit $form(submit_$item)}
$item configure -command \
[list HM::submit_button $win $var(form_id) $form(param) \
$submit]
}
# unset all unused fields here
unset form(reset) form(submit) form(reset_button) form(submit_button)
unset var(form_id)
}
###################################################################
# handle form input items
# each item type is handled in a separate procedure
# Each "type" procedure needs to:
# - create the window
# - initialize it
# - add the "submit" and "reset" commands onto the proper Q's
# "submit" is subst'd
# "reset" is eval'd
proc HM::tag_input {win param text} {
upvar #0 HM::$win var
set type text ;# the default
HM::extract_param $param type
set type [string tolower $type]
if {[catch {HM::input_$type $win $param} err]} {
puts stderr $err
}
}
# input type=text
# parameters NAME (reqd), MAXLENGTH, SIZE, VALUE
proc HM::input_text {win param {show {}}} {
upvar #0 HM::$win var
upvar #0 $var(form_id) form
# make the entry
HM::extract_param $param name ;# required
set item $win.input_text,$var(tags)
set size 20; HM::extract_param $param size
set maxlength 0; HM::extract_param $param maxlength
entry $item -width $size -show $show
# set the initial value
set value ""; HM::extract_param $param value
$item insert 0 $value
# insert the entry
HM::win_install $win $item
# set the "reset" and "submit" commands
append form(reset) ";$item delete 0 end;$item insert 0 [list $value]"
lappend form(submit) [list $name "\[$item get]"]
# handle the maximum length (broken - no way to cleanup bindtags state)
if {$maxlength} {
bindtags $item "[bindtags $item] max$maxlength"
bind max$maxlength <KeyPress> "%W delete $maxlength end"
}
}
# password fields - same as text, only don't show data
# parameters NAME (reqd), MAXLENGTH, SIZE, VALUE
proc HM::input_password {win param} {
HM::input_text $win $param *
}
# checkbuttons are missing a "get" option, so we must use a global
# variable to store the value.
# Parameters NAME, VALUE, (reqd), CHECKED
proc HM::input_checkbox {win param} {
upvar #0 HM::$win var
upvar #0 $var(form_id) form
HM::extract_param $param name
HM::extract_param $param value
# Set the global variable, don't use the "form" alias as it is not
# defined in the global scope of the button
set variable $var(form_id)(check_$var(tags))
set item $win.input_checkbutton,$var(tags)
checkbutton $item -variable $variable -off {} -on $value -text " "
if {[HM::extract_param $param checked]} {
$item select
append form(reset) ";$item select"
} else {
append form(reset) ";$item deselect"
}
HM::win_install $win $item
lappend form(submit) [list $name \$form(check_$var(tags))]
}
# radio buttons. These are like check buttons, but only one can be selected
proc HM::input_radio {win param} {
upvar #0 HM::$win var
upvar #0 $var(form_id) form
HM::extract_param $param name
HM::extract_param $param value
set first [expr ![info exists form(radio_$name)]]
set variable $var(form_id)(radio_$name)
set variable $var(form_id)(radio_$name)
set item $win.input_radiobutton,$var(tags)
radiobutton $item -variable $variable -value $value -text " "
HM::win_install $win $item
if {$first || [HM::extract_param $param checked]} {
$item select
append form(reset) ";$item select"
} else {
append form(reset) ";$item deselect"
}
# do the "submit" actions in /form so we only end up with 1 per button grouping
# contributing to the submission
}
# hidden fields, just append to the "submit" data
# params: NAME, VALUE (reqd)
proc HM::input_hidden {win param} {
upvar #0 HM::$win var
upvar #0 $var(form_id) form
HM::extract_param $param name
HM::extract_param $param value
lappend form(submit) [list $name $value]
}
# handle input images. The spec isn't very clear on these, so I'm not
# sure its quite right
# Use std image tag, only set up our own callbacks
# (e.g. make sure ismap isn't set)
# params: NAME, SRC (reqd) ALIGN
proc HM::input_image {win param} {
upvar #0 HM::$win var
upvar #0 $var(form_id) form
HM::extract_param $param name
set name ;# barf if no name is specified
set item [HM::tag_img $win $param {}]
$item configure -relief raised -bd 2 -bg blue
# make a dummy "submit" button, and invoke it to send the form.
# We have to get the %x,%y in the value somehow, so calculate it during
# binding, and save it in the form array for later processing
set submit $win.dummy_submit,$var(tags)
if {[winfo exists $submit]} {
destroy $submit
}
button $submit -takefocus 0;# this never gets mapped!
lappend form(submit_button) $submit
set form(submit_$submit) [list $name $name.\$form(X).\$form(Y)]
$item configure -takefocus 1
bind $item <FocusIn> "catch \{$win see $item\}"
bind $item <1> "$item configure -relief sunken"
bind $item <Return> "
set $var(form_id)(X) 0
set $var(form_id)(Y) 0
$submit invoke
"
bind $item <ButtonRelease-1> "
set $var(form_id)(X) %x
set $var(form_id)(Y) %y
$item configure -relief raised
$submit invoke
"
}
# Set up the reset button. Wait for the /form to attach
# the -command option. There could be more that 1 reset button
# params VALUE
proc HM::input_reset {win param} {
upvar #0 HM::$win var
upvar #0 $var(form_id) form
set value reset
HM::extract_param $param value
set item $win.input_reset,$var(tags)
button $item -text [HM::map_esc $value]
HM::win_install $win $item
lappend form(reset_button) $item
}
# Set up the submit button. Wait for the /form to attach
# the -command option. There could be more that 1 submit button
# params: NAME, VALUE
proc HM::input_submit {win param} {
upvar #0 HM::$win var
upvar #0 $var(form_id) form
HM::extract_param $param name
set value submit
HM::extract_param $param value
set item $win.input_submit,$var(tags)
button $item -text [HM::map_esc $value] -fg blue
HM::win_install $win $item
lappend form(submit_button) $item
# need to tie the "name=value" to this button
# save the pair and do it when we finish the submit button
catch {set form(submit_$item) [list $name $value]}
}
#########################################################################
# selection items
# They all go into a list box. We don't what to do with the listbox until
# we know how many items end up in it. Gather up the data for the "options"
# and finish up in the /select tag
# params: NAME (reqd), MULTIPLE, SIZE
proc HM::tag_select {win param text} {
upvar #0 HM::$win var
upvar #0 $var(form_id) form
HM::extract_param $param name
set size 5; HM::extract_param $param size
set form(select_size) $size
set form(select_name) $name
set form(select_values) "" ;# list of values to submit
if {[HM::extract_param $param multiple]} {
set mode multiple
} else {
set mode single
}
set item $win.select,$var(tags)
frame $item
set form(select_frame) $item
listbox $item.list -selectmode $mode -width 0 -exportselection 0
HM::win_install $win $item
}
# select options
# The values returned in the query may be different from those
# displayed in the listbox, so we need to keep a separate list of
# query values.
# form(select_default) - contains the default query value
# form(select_frame) - name of the listbox's containing frame
# form(select_values) - list of query values
# params: VALUE, SELECTED
proc HM::tag_option {win param text} {
upvar #0 HM::$win var
upvar #0 $var(form_id) form
upvar $text data
set frame $form(select_frame)
# set default option (or options)
if {[HM::extract_param $param selected]} {
lappend form(select_default) [$form(select_frame).list size]
}
set value [string trimright $data " \n"]
$frame.list insert end $value
HM::extract_param $param value
lappend form(select_values) $value
set data ""
}
# do most of the work here!
# if SIZE>1, make the listbox. Otherwise make a "drop-down"
# listbox with a label in it
# If the # of items > size, add a scroll bar
# This should probably be broken up into callbacks to make it
# easier to override the "look".
proc HM::tag_/select {win param text} {
upvar #0 HM::$win var
upvar #0 $var(form_id) form
set frame $form(select_frame)
set size $form(select_size)
set items [$frame.list size]
# set the defaults and reset button
append form(reset) ";$frame.list selection clear 0 $items"
if {[info exists form(select_default)]} {
foreach i $form(select_default) {
$frame.list selection set $i
append form(reset) ";$frame.list selection set $i"
}
} else {
$frame.list selection set 0
append form(reset) ";$frame.list selection set 0"
}
# set up the submit button. This is the general case. For single
# selections we could be smarter
for {set i 0} {$i < $size} {incr i} {
set value [format {[expr {[%s selection includes %s] ? {%s} : {}}]} \
$frame.list $i [lindex $form(select_values) $i]]
lappend form(submit) [list $form(select_name) $value]
}
# show the listbox - no scroll bar
if {$size > 1 && $items <= $size} {
$frame.list configure -height $items
pack $frame.list
# Listbox with scrollbar
} elseif {$size > 1} {
scrollbar $frame.scroll -command "$frame.list yview" \
-orient v -takefocus 0
$frame.list configure -height $size \
-yscrollcommand "$frame.scroll set"
pack $frame.list $frame.scroll -side right -fill y
# This is a joke!
} else {
scrollbar $frame.scroll -command "$frame.list yview" \
-orient h -takefocus 0
$frame.list configure -height 1 \
-yscrollcommand "$frame.scroll set"
pack $frame.list $frame.scroll -side top -fill x
}
# cleanup
foreach i [array names form select_*] {
unset form($i)
}
}
# do a text area (multi-line text)
# params: COLS, NAME, ROWS (all reqd, but default rows and cols anyway)
proc HM::tag_textarea {win param text} {
upvar #0 HM::$win var
upvar #0 $var(form_id) form
upvar $text data
set rows 5; HM::extract_param $param rows
set cols 30; HM::extract_param $param cols
HM::extract_param $param name
set item $win.textarea,$var(tags)
frame $item
text $item.text -width $cols -height $rows -wrap none \
-yscrollcommand "$item.scroll set" -padx 3 -pady 3
scrollbar $item.scroll -command "$item.text yview" -orient v
$item.text insert 1.0 $data
HM::win_install $win $item
pack $item.text $item.scroll -side right -fill y
lappend form(submit) [list $name "\[$item.text get 0.0 end]"]
append form(reset) ";$item.text delete 1.0 end; \
$item.text insert 1.0 [list $data]"
set data ""
}
# procedure to install windows into the text widget
# - win: name of the text widget
# - item: name of widget to install
proc HM::win_install {win item} {
upvar #0 HM::$win var
$win window create $var(S_insert) -window $item -align bottom
$win tag add indent$var(level) $item
set focus [expr {[winfo class $item] != "Frame"}]
$item configure -takefocus $focus
bind $item <FocusIn> "$win see $item"
}
#####################################################################
# Assemble and submit the query
# each list element in "stuff" is a name/value pair
# - The names are the NAME parameters of the various fields
# - The values get run through "subst" to extract the values
# - We do the user callback with the list of name value pairs
proc HM::submit_button {win form_id param stuff} {
upvar #0 HM::$win var
upvar #0 $form_id form
set query ""
foreach pair $stuff {
set value [subst [lindex $pair 1]]
if {$value != ""} {
set item [lindex $pair 0]
lappend query $item $value
}
}
# this is the user callback.
HM::submit_form $win $param $query
}
# sample user callback for form submission
# should be replaced by the application
# Sample version generates a string suitable for http
proc HM::submit_form {win param query} {
set result ""
set sep ""
foreach i $query {
append result $sep [HM::map_reply $i]
if {$sep != "="} {set sep =} {set sep &}
}
puts $result
}
# do x-www-urlencoded character mapping
# The spec says: "non-alphanumeric characters are replaced by '%HH'"
set HM::alphanumeric a-zA-Z0-9 ;# definition of alphanumeric character class
for {set i 1} {$i <= 256} {incr i} {
set c [format %c $i]
if {![string match \[$HM::alphanumeric\] $c]} {
set HM::form_map($c) %[format %.2x $i]
}
}
# 1 leave alphanumerics characters alone
# 2 Convert every other character to an array lookup
# 3 Escape constructs that are "special" to the tcl parser
# 4 "subst" the result, doing all the array substitutions
proc HM::map_reply {string} {
global HM::form_map HM::alphanumeric
regsub -all \[^$HM::alphanumeric\] $string {$HM::form_map(&)} string
regsub -all \n $string {\\n} string
regsub -all \t $string {\\t} string
regsub -all {[][{})\\]\)} $string {\\&} string
return [subst $string]
}
# convert a x-www-urlencoded string int a a list of name/value pairs
# 1 convert a=b&c=d... to {a} {b} {c} {d}...
# 2, convert + to " "
# 3, convert %xx to char equiv
proc HM::cgiDecode {data} {
set data [split $data "&="]
foreach i $data {
lappend result [cgiMap $i]
}
return $result
}
proc HM::cgiMap {data} {
regsub -all {\+} $data " " data
if {[regexp % $data]} {
regsub -all {([][$\\])} $data {\\\1} data
regsub -all {%([0-9a-fA-F][0-9a-fA-F])} $data {[format %c 0x\1]} data
return [subst $data]
} else {
return $data
}
}
# There is a bug in the tcl library focus routines that prevents focus
# from every reaching an un-viewable window. Use our *own*
# version of the library routine, until the bug is fixed, make sure we
# over-ride the library version, and not the otherway around
#auto_load tkFocusOK
#proc tkFocusOK w {
# set code [catch {$w cget -takefocus} value]
# if {($code == 0) && ($value != "")} {
# if {$value == 0} {
# return 0
# } elseif {$value == 1} {
# return 1
# } else {
# set value [uplevel #0 $value $w]
# if {$value != ""} {
# return $value
# }
# }
# }
# set code [catch {$w cget -state} value]
# if {($code == 0) && ($value == "disabled")} {
# return 0
# }
# regexp Key|Focus "[bind $w] [bind [winfo class $w]]"
#}
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