# html.tcl --
#
# Procedures to make generating HTML easier.
#
# This module depends on the ncgi module for the procedures
# that initialize form elements based on current CGI values.
#
# Copyright (c) 1998-2000 by Ajuba Solutions.
# Copyright (c) 2006 Michael Schlenker
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
#
# Originally by Brent Welch, with help from Dan Kuchler and Melissa Chawla
package require Tcl 8.2
package require ncgi
package provide html 1.4.4
namespace eval ::html {
# State about the current page
variable page
# A simple set of global defaults for tag parameters is implemented
# by storing into elements indexed by "key.param", where key is
# often the name of an HTML tag (anything for scoping), and
# param must be the name of the HTML tag parameter (e.g., "href" or "size")
# input.size
# body.bgcolor
# body.text
# font.face
# font.size
# font.color
variable defaults
array set defaults {
input.size 45
body.bgcolor white
body.text black
}
# In order to nandle nested calls to redefined control structures,
# we need a temporary variable that is known not to exist. We keep this
# counter to append to the varname. Each time we need a temporary
# variable, we increment this counter.
variable randVar 0
# No more export, because this defines things like
# foreach and if that do HTML things, not Tcl control
# namespace export *
# Dictionary mapping from special characters to their entities.
variable entities {
\xa0 \xa1 ¡ \xa2 ¢ \xa3 £ \xa4 ¤
\xa5 ¥ \xa6 ¦ \xa7 § \xa8 ¨ \xa9 ©
\xaa ª \xab « \xac ¬ \xad \xae ®
\xaf ¯ \xb0 ° \xb1 ± \xb2 ² \xb3 ³
\xb4 ´ \xb5 µ \xb6 ¶ \xb7 · \xb8 ¸
\xb9 ¹ \xba º \xbb » \xbc ¼ \xbd ½
\xbe ¾ \xbf ¿ \xc0 À \xc1 Á \xc2 Â
\xc3 Ã \xc4 Ä \xc5 Å \xc6 Æ \xc7 Ç
\xc8 È \xc9 É \xca Ê \xcb Ë \xcc Ì
\xcd Í \xce Î \xcf Ï \xd0 Ð \xd1 Ñ
\xd2 Ò \xd3 Ó \xd4 Ô \xd5 Õ \xd6 Ö
\xd7 × \xd8 Ø \xd9 Ù \xda Ú \xdb Û
\xdc Ü \xdd Ý \xde Þ \xdf ß \xe0 à
\xe1 á \xe2 â \xe3 ã \xe4 ä \xe5 å
\xe6 æ \xe7 ç \xe8 è \xe9 é \xea ê
\xeb ë \xec ì \xed í \xee î \xef ï
\xf0 ð \xf1 ñ \xf2 ò \xf3 ó \xf4 ô
\xf5 õ \xf6 ö \xf7 ÷ \xf8 ø \xf9 ù
\xfa ú \xfb û \xfc ü \xfd ý \xfe þ
\xff ÿ \u192 ƒ \u391 Α \u392 Β \u393 Γ
\u394 Δ \u395 Ε \u396 Ζ \u397 Η \u398 Θ
\u399 Ι \u39A Κ \u39B Λ \u39C Μ \u39D Ν
\u39E Ξ \u39F Ο \u3A0 Π \u3A1 Ρ \u3A3 Σ
\u3A4 Τ \u3A5 Υ \u3A6 Φ \u3A7 Χ \u3A8 Ψ
\u3A9 Ω \u3B1 α \u3B2 β \u3B3 γ \u3B4 δ
\u3B5 ε \u3B6 ζ \u3B7 η \u3B8 θ \u3B9 ι
\u3BA κ \u3BB λ \u3BC μ \u3BD ν \u3BE ξ
\u3BF ο \u3C0 π \u3C1 ρ \u3C2 ς \u3C3 σ
\u3C4 τ \u3C5 υ \u3C6 φ \u3C7 χ \u3C8 ψ
\u3C9 ω \u3D1 ϑ \u3D2 ϒ \u3D6 ϖ
\u2022 • \u2026 … \u2032 ′ \u2033 ″
\u203E ‾ \u2044 ⁄ \u2118 ℘ \u2111 ℑ
\u211C ℜ \u2122 ™ \u2135 ℵ \u2190 ←
\u2191 ↑ \u2192 → \u2193 ↓ \u2194 ↔ \u21B5 ↵
\u21D0 ⇐ \u21D1 ⇑ \u21D2 ⇒ \u21D3 ⇓ \u21D4 ⇔
\u2200 ∀ \u2202 ∂ \u2203 ∃ \u2205 ∅
\u2207 ∇ \u2208 ∈ \u2209 ∉ \u220B ∋ \u220F ∏
\u2211 ∑ \u2212 − \u2217 ∗ \u221A √
\u221D ∝ \u221E ∞ \u2220 ∠ \u2227 ∧ \u2228 ∨
\u2229 ∩ \u222A ∪ \u222B ∫ \u2234 ∴ \u223C ∼
\u2245 ≅ \u2248 ≈ \u2260 ≠ \u2261 ≡ \u2264 ≤
\u2265 ≥ \u2282 ⊂ \u2283 ⊃ \u2284 ⊄ \u2286 ⊆
\u2287 ⊇ \u2295 ⊕ \u2297 ⊗ \u22A5 ⊥
\u22C5 ⋅ \u2308 ⌈ \u2309 ⌉ \u230A ⌊
\u230B ⌋ \u2329 〈 \u232A 〉 \u25CA ◊
\u2660 ♠ \u2663 ♣ \u2665 ♥ \u2666 ♦
\x22 " \x26 & \x3C < \x3E > \u152 Œ
\u153 œ \u160 Š \u161 š \u178 Ÿ
\u2C6 ˆ \u2DC ˜ \u2002 \u2003 \u2009
\u200C \u200D \u200E \u200F \u2013 –
\u2014 — \u2018 ‘ \u2019 ’ \u201A ‚
\u201C “ \u201D ” \u201E „ \u2020 †
\u2021 ‡ \u2030 ‰ \u2039 ‹ \u203A ›
\u20AC €
}
}
# ::html::foreach
#
# Rework the "foreach" command to blend into HTML template files.
# Rather than evaluating the body, we return the subst'ed body. Each
# iteration of the loop causes another string to be concatenated to
# the result value. No error checking is done on any arguments.
#
# Arguments:
# varlist Variables to instantiate with values from the next argument.
# list Values to set variables in varlist to.
# args ?varlist2 list2 ...? body, where body is the string to subst
# during each iteration of the loop.
#
# Results:
# Returns a string composed of multiple concatenations of the
# substitued body.
#
# Side Effects:
# None.
proc ::html::foreach {vars vals args} {
variable randVar
# The body of the foreach loop must be run in the stack frame
# above this one in order to have access to local variable at that stack
# level.
# To support nested foreach loops, we use a uniquely named
# variable to store incremental results.
incr randVar
::set resultVar "result_$randVar"
# Extract the body and any varlists and valuelists from the args.
::set body [lindex $args end]
::set varvals [linsert [lreplace $args end end] 0 $vars $vals]
# Create the script to eval in the stack frame above this one.
::set script "::foreach"
::foreach {vars vals} $varvals {
append script " [list $vars] [list $vals]"
}
append script " \{\n"
append script " append $resultVar \[subst \{$body\}\]\n"
append script "\}\n"
# Create a temporary variable in the stack frame above this one,
# and use it to store the incremental results of the multiple loop
# iterations. Remove the temporary variable when we're done so there's
# no trace of this loop left in that stack frame.
upvar 1 $resultVar tmp
::set tmp ""
uplevel 1 $script
::set result $tmp
unset tmp
return $result
}
# ::html::for
#
# Rework the "for" command to blend into HTML template files.
# Rather than evaluating the body, we return the subst'ed body. Each
# iteration of the loop causes another string to be concatenated to
# the result value. No error checking is done on any arguments.
#
# Arguments:
# start A script to evaluate once at the very beginning.
# test An expression to eval before each iteration of the loop.
# Once the expression is false, the command returns.
# next A script to evaluate after each iteration of the loop.
# body The string to subst during each iteration of the loop.
#
# Results:
# Returns a string composed of multiple concatenations of the
# substitued body.
#
# Side Effects:
# None.
proc ::html::for {start test next body} {
variable randVar
# The body of the for loop must be run in the stack frame
# above this one in order to have access to local variable at that stack
# level.
# To support nested for loops, we use a uniquely named
# variable to store incremental results.
incr randVar
::set resultVar "result_$randVar"
# Create the script to eval in the stack frame above this one.
::set script "::for [list $start] [list $test] [list $next] \{\n"
append script " append $resultVar \[subst \{$body\}\]\n"
append script "\}\n"
# Create a temporary variable in the stack frame above this one,
# and use it to store the incremental resutls of the multiple loop
# iterations. Remove the temporary variable when we're done so there's
# no trace of this loop left in that stack frame.
upvar 1 $resultVar tmp
::set tmp ""
uplevel 1 $script
::set result $tmp
unset tmp
return $result
}
# ::html::while
#
# Rework the "while" command to blend into HTML template files.
# Rather than evaluating the body, we return the subst'ed body. Each
# iteration of the loop causes another string to be concatenated to
# the result value. No error checking is done on any arguments.
#
# Arguments:
# test An expression to eval before each iteration of the loop.
# Once the expression is false, the command returns.
# body The string to subst during each iteration of the loop.
#
# Results:
# Returns a string composed of multiple concatenations of the
# substitued body.
#
# Side Effects:
# None.
proc ::html::while {test body} {
variable randVar
# The body of the while loop must be run in the stack frame
# above this one in order to have access to local variable at that stack
# level.
# To support nested while loops, we use a uniquely named
# variable to store incremental results.
incr randVar
::set resultVar "result_$randVar"
# Create the script to eval in the stack frame above this one.
::set script "::while [list $test] \{\n"
append script " append $resultVar \[subst \{$body\}\]\n"
append script "\}\n"
# Create a temporary variable in the stack frame above this one,
# and use it to store the incremental resutls of the multiple loop
# iterations. Remove the temporary variable when we're done so there's
# no trace of this loop left in that stack frame.
upvar 1 $resultVar tmp
::set tmp ""
uplevel 1 $script
::set result $tmp
unset tmp
return $result
}
# ::html::if
#
# Rework the "if" command to blend into HTML template files.
# Rather than evaluating a body clause, we return the subst'ed body.
# No error checking is done on any arguments.
#
# Arguments:
# test An expression to eval to decide whether to use the then body.
# body The string to subst if the test case was true.
# args ?elseif test body2 ...? ?else bodyn?, where bodyn is the string
# to subst if none of the tests are true.
#
# Results:
# Returns a string composed by substituting a body clause.
#
# Side Effects:
# None.
proc ::html::if {test body args} {
variable randVar
# The body of the then/else clause must be run in the stack frame
# above this one in order to have access to local variable at that stack
# level.
# To support nested if's, we use a uniquely named
# variable to store incremental results.
incr randVar
::set resultVar "result_$randVar"
# Extract the elseif clauses and else clause if they exist.
::set cmd [linsert $args 0 "::if" $test $body]
::foreach {keyword test body} $cmd {
::if {[string equal $keyword "else"]} {
append script " else \{\n"
::set body $test
} else {
append script " $keyword [list $test] \{\n"
}
append script " append $resultVar \[subst \{$body\}\]\n"
append script "\} "
}
# Create a temporary variable in the stack frame above this one,
# and use it to store the incremental resutls of the multiple loop
# iterations. Remove the temporary variable when we're done so there's
# no trace of this loop left in that stack frame.
upvar $resultVar tmp
::set tmp ""
uplevel $script
::set result $tmp
unset tmp
return $result
}
# ::html::set
#
# Rework the "set" command to blend into HTML template files.
# The return value is always "" so nothing is appended in the
# template. No error checking is done on any arguments.
#
# Arguments:
# var The variable to set.
# val The new value to give the variable.
#
# Results:
# Returns "".
#
# Side Effects:
# None.
proc ::html::set {var val} {
# The variable must be set in the stack frame above this one.
::set cmd [list set $var $val]
uplevel 1 $cmd
return ""
}
# ::html::eval
#
# Rework the "eval" command to blend into HTML template files.
# The return value is always "" so nothing is appended in the
# template. No error checking is done on any arguments.
#
# Arguments:
# args The args to evaluate. At least one must be given.
#
# Results:
# Returns "".
#
# Side Effects:
# Throws an error if no arguments are given.
proc ::html::eval {args} {
# The args must be evaluated in the stack frame above this one.
::eval [linsert $args 0 uplevel 1]
return ""
}
# ::html::init
#
# Reset state that gets accumulated for the current page.
#
# Arguments:
# nvlist Name, value list that is used to initialize default namespace
# variables that set font, size, etc.
#
# Side Effects:
# Wipes the page state array
proc ::html::init {{nvlist {}}} {
variable page
variable defaults
::if {[info exists page]} {
unset page
}
::if {[info exists defaults]} {
unset defaults
}
array set defaults $nvlist
}
# ::html::head
#
# Generate the section. There are a number of
# optional calls you make *before* this to inject
# meta tags - see everything between here and the bodyTag proc.
#
# Arguments:
# title The page title
#
# Results:
# HTML for the section
proc ::html::head {title} {
variable page
::set html "[openTag html][openTag head]\n"
append html "\t[title $title]"
::if {[info exists page(author)]} {
append html "\t$page(author)"
}
::if {[info exists page(meta)]} {
::foreach line $page(meta) {
append html "\t$line\n"
}
}
::if {[info exists page(css)]} {
::foreach style $page(css) {
append html "\t$style\n"
}
}
::if {[info exists page(js)]} {
::foreach script $page(js) {
append html "\t$script\n"
}
}
append html "[closeTag]\n"
}
# ::html::title
#
# Wrap up the and tuck it away for use in the page later.
#
# Arguments:
# title The page title
#
# Results:
# HTML for the section
proc ::html::title {title} {
variable page
::set page(title) $title
::set html "$title\n"
return $html
}
# ::html::getTitle
#
# Return the title of the current page.
#
# Arguments:
# None
#
# Results:
# The title
proc ::html::getTitle {} {
variable page
::if {[info exists page(title)]} {
return $page(title)
} else {
return ""
}
}
# ::html::meta
#
# Generate a meta tag. This tag gets bundled into the
# section generated by html::head
#
# Arguments:
# args A name-value list of meta tag names and values.
#
# Side Effects:
# Stores HTML for the tag for use later by html::head
proc ::html::meta {args} {
variable page
::set html ""
::foreach {name value} $args {
append html ""
}
lappend page(meta) $html
return ""
}
# ::html::refresh
#
# Generate a meta refresh tag. This tag gets bundled into the
# section generated by html::head
#
# Arguments:
# content Time period, in seconds, before the refresh
# url (option) new page to view. If not specified, then
# the current page is reloaded.
#
# Side Effects:
# Stores HTML for the tag for use later by html::head
proc ::html::refresh {content {url {}}} {
variable page
::set html ""
lappend page(meta) $html
return ""
}
# ::html::headTag
#
# Embed a tag into the HEAD section
# generated by html::head
#
# Arguments:
# string Everything but the < > for the tag.
#
# Side Effects:
# Stores HTML for the tag for use later by html::head
proc ::html::headTag {string} {
variable page
lappend page(meta) <$string>
return ""
}
# ::html::keywords
#
# Add META tag keywords to the section.
# Call this before you call html::head
#
# Arguments:
# args The keywords
#
# Side Effects:
# See html::meta
proc ::html::keywords {args} {
html::meta keywords [join $args ", "]
}
# ::html::description
#
# Add a description META tag to the section.
# Call this before you call html::head
#
# Arguments:
# description The description
#
# Side Effects:
# See html::meta
proc ::html::description {description} {
html::meta description $description
}
# ::html::author
#
# Add an author comment to the section.
# Call this before you call html::head
#
# Arguments:
# author Author's name
#
# Side Effects:
# sets page(author)
proc ::html::author {author} {
variable page
::set page(author) "\n"
return ""
}
# ::html::tagParam
#
# Return a name, value string for the tag parameters.
# The values come from "hard-wired" values in the
# param agrument, or from the defaults set with html::init.
#
# Arguments:
# tag Name of the HTML tag (case insensitive).
# param pname=value info that overrides any default values
#
# Results
# A string of the form:
# pname="keyvalue" name2="2nd value"
proc ::html::tagParam {tag {param {}}} {
variable defaults
::set def ""
::foreach key [lsort [array names defaults $tag.*]] {
append def [default $key $param]
}
return [string trimleft $param$def]
}
# ::html::default
#
# Return a default value, if one has been registered
# and an overriding value does not occur in the existing
# tag parameters.
#
# Arguments:
# key Index into the defaults array defined by html::init
# This is expected to be in the form tag.pname where
# the pname part is used in the tag parameter name
# param pname=value info that overrides any default values
#
# Results
# pname="keyvalue"
proc ::html::default {key {param {}}} {
variable defaults
::set pname [string tolower [lindex [split $key .] 1]]
::set key [string tolower $key]
::if {![regexp -nocase "(\[ \]|^)$pname=" $param] &&
[info exists defaults($key)] &&
[string length $defaults($key)]} {
return " $pname=\"$defaults($key)\""
} else {
return ""
}
}
# ::html::bodyTag
#
# Generate a body tag
#
# Arguments:
# none
#
# Results
# A body tag
proc ::html::bodyTag {args} {
return [openTag body [join $args]]\n
}
# The following procedures are all related to generating form elements
# that are initialized to store the current value of the form element
# based on the CGI state. These functions depend on the ncgi::value
# procedure and assume that the caller has called ncgi::parse and/or
# ncgi::init appropriately to initialize the ncgi module.
# ::html::formValue
#
# Return a name and value pair, where the value is initialized
# from existing form data, if any.
#
# Arguments:
# name The name of the form element
# defvalue A default value to use, if not appears in the CGI
# inputs. DEPRECATED - use ncgi::defValue instead.
#
# Retults:
# A string like:
# name="fred" value="freds value"
proc ::html::formValue {name {defvalue {}}} {
::set value [ncgi::value $name]
::if {[string length $value] == 0} {
::set value $defvalue
}
return "name=\"$name\" value=\"[quoteFormValue $value]\""
}
# ::html::quoteFormValue
#
# Quote a value for use in a value=\"$value\" fragment.
#
# Arguments:
# value The value to quote
#
# Retults:
# A string like:
# "Hello, <b>World!"
proc ::html::quoteFormValue {value} {
return [string map [list "&" "&" "\"" """ \
"'" "'" "<" "<" ">" ">"] $value]
}
# ::html::textInput --
#
# Return an element. This uses the
# input.size default falue.
#
# Arguments:
# name The form element name
# args Additional attributes for the INPUT tag
#
# Results:
# The html fragment
proc ::html::textInput {name {value {}} args} {
::set html "\n"
return $html
}
# ::html::textInputRow --
#
# Format a table row containing a text input element and a label.
#
# Arguments:
# label Label to display next to the form element
# name The form element name
# args Additional attributes for the INPUT tag
#
# Results:
# The html fragment
proc ::html::textInputRow {label name {value {}} args} {
::set html [row $label [::eval [linsert $args 0 html::textInput $name $value]]]
return $html
}
# ::html::passwordInputRow --
#
# Format a table row containing a password input element and a label.
#
# Arguments:
# label Label to display next to the form element
# name The form element name
#
# Results:
# The html fragment
proc ::html::passwordInputRow {label {name password}} {
::set html [row $label [passwordInput $name]]
return $html
}
# ::html::passwordInput --
#
# Return an element.
#
# Arguments:
# name The form element name. Defaults to "password"
#
# Results:
# The html fragment
proc ::html::passwordInput {{name password}} {
::set html "\n"
return $html
}
# ::html::checkbox --
#
# Format a checkbox so that it retains its state based on
# the current CGI values
#
# Arguments:
# name The form element name
# value The value associated with the checkbox
#
# Results:
# The html fragment
proc ::html::checkbox {name value} {
::set html "\n"
}
# ::html::checkValue
#
# Like html::formalue, but for checkboxes that need CHECKED
#
# Arguments:
# name The name of the form element
# defvalue A default value to use, if not appears in the CGI
# inputs
#
# Retults:
# A string like:
# name="fred" value="freds value" CHECKED
proc ::html::checkValue {name {value 1}} {
::foreach v [ncgi::valueList $name] {
::if {[string compare $value $v] == 0} {
return "name=\"$name\" value=\"[quoteFormValue $value]\" checked"
}
}
return "name=\"$name\" value=\"[quoteFormValue $value]\""
}
# ::html::radioValue
#
# Like html::formValue, but for radioboxes that need CHECKED
#
# Arguments:
# name The name of the form element
# value The value associated with the radio button.
#
# Retults:
# A string like:
# name="fred" value="freds value" CHECKED
proc ::html::radioValue {name value {defaultSelection {}}} {
::if {[string equal $value [ncgi::value $name $defaultSelection]]} {
return "name=\"$name\" value=\"[quoteFormValue $value]\" checked"
} else {
return "name=\"$name\" value=\"[quoteFormValue $value]\""
}
}
# ::html::radioSet --
#
# Display a set of radio buttons while looking for an existing
# value from the query data, if any.
proc ::html::radioSet {key sep list {defaultSelection {}}} {
::set html ""
::set s ""
::foreach {label v} $list {
append html "$s $label"
::set s $sep
}
return $html
}
# ::html::checkSet --
#
# Display a set of check buttons while looking for an existing
# value from the query data, if any.
proc ::html::checkSet {key sep list} {
::set s ""
::foreach {label v} $list {
append html "$s $label"
::set s $sep
}
return $html
}
# ::html::select --
#
# Format a