MediaWiki:TextCleaner.js
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// <source lang="javascript">
/*
Wikitext sanitation for MediaWiki
Author: [[User:Lupo]], January 2008
License: Quadruple licensed GFDL, GPL, LGPL and Creative Commons Attribution 3.0 (CC-BY-3.0)
Choose whichever license of these you like best :-)
*/
var TextCleaner =
{
imgNamespaceNames : null,
// This function attempts to construct well-formed wikitext from input that may contain
// possibly broken wikitext.
//
// Note: even just a half-baked sanitation of wikitext is hyper-complex due to the presence
// of templates, and due to the fact that image thumbnail captions may themselves contain
// links. This implementation catches the most common errors (such as forgetting to close a
// template or a link), and even some more elaborate ones. With enough malice, this sanitation
// can still be broken by user input such that the result is not well-formed wikitext as the
// parser at the servers would like to have it. (It's still possible that the result is broken
// wikitext, if the input was broken wikitext. But it never transforms well-formed wikitext
// into broken wikitext.)
//
// If 'only_thumbs' is true, all [[Image: links are changed to [[:Image:, unless the original
// image link was a thumbnail or had a width smaller than 300px specified.
//
// WARNING: do *not* attempt to use this to process large texts (e.g., a whole article). It is
// probably rather inefficient due to the many substrings that are generated. This function is
// primarily intended to be used to clean up user input in forms, which are typically rather
// short.
sanitizeWikiText : function (input, only_thumbs)
{
if (input.search (/[\][}{]|<nowiki(\s[^>]*)?>|<\!--/) < 0) return input;
// No critical characters
if (!TextCleaner.imgNamespaceNames) {
TextCleaner.imgNamespaceNames = [];
if (wgNamespaceIds) {
for (name in wgNamespaceIds) {
if (wgNamespaceIds[name] == 6) // Image namespace
TextCleaner.imgNamespaceNames[TextCleaner.imgNamespaceNames.length] = name;
}
}
// Make sure that we have the two canonical names
TextCleaner.imgNamespaceNames[TextCleaner.imgNamespaceNames.length] = 'Image';
TextCleaner.imgNamespaceNames[TextCleaner.imgNamespaceNames.length] = 'File';
// If your Wiki does not have wgNamespaceIds, add aliases or localized namespace names here!
}
var consumed = new Array (0, 0);
// For image captions. Image caption may contain links, and may even contain images.
// The current MediaWiki parser actually allows this only once. For deeper recursions,
// it fails. But here, it's actually easier to implement no limit.
var base_regexp =
new RegExp
( "[\\x01\\x02\\x03\\x04[\\]\\|\\x05\\x06\\x07\\x08]"
+ "|\<nowiki(\\s[^>]*)?\>|\<\!--"
, "i"); // Ignore case
var nowiki_regexp = new RegExp ("\<\\/nowiki(\\s[^>]*)?\>|\<\!--", "i");
var allow_only_thumbs = only_thumbs;
function sanitize
(s, with_links, caption_level, allow_thumbs, break_at_pipe, with_tables, with_galleries)
{
if (!s || s.length == 0) {
if (caption_level > 0) {
if (consumed.length < caption_level)
consumed.push (0);
else
consumed[caption_level-1] = 0;
}
return s;
}
var result = "";
var initial_length = s.length;
var get_out = false;
var in_nowiki = false;
var endings = null;
// Stack recording template and table nesting
var next;
function push_end (val)
{
if (endings == null) {
endings = new Array (1);
endings[0] = val;
} else {
endings[endings.length] = val;
}
}
function pop_end ()
{
if (endings == null) return null; // Shouldn't happen
var result;
if (endings.length == 1) {
result = endings[0];
endings = null;
} else {
result = endings[endings.length -1];
endings.length = endings.length - 1;
}
return result;
}
regexp = base_regexp;
while (s.length > 0 && !get_out) {
next = s.search (regexp);
if (next < 0) {
result = result + s;
break;
}
var ch = s.charAt (next);
var i = -1;
var j = -1;
var k = -1;
switch (ch) {
case '<':
// Nowiki or HTML comment. Must be closed.
if (s.charAt (next+1) == '!') {
// HTML comment. Cannot be nested.
i = s.indexOf ('--\>', next+3);
if (i < 0) {
result = result + s + '--\>';
s = "";
} else {
result = result + s.substring (0, i + 3);
s = s.substring (i+3);
}
} else if (s.charAt (next+1) == 'n') {
// Nowiki may contain HTML comments!
in_nowiki = true;
regexp = nowiki_regexp;
result = result + s.substring (0, next + 7);
s = s.substring (next + 7);
} else {
// End of nowiki. Searched for and found only if in_nowiki == true
in_nowiki = false;
regexp = base_regexp;
i = s.indexOf ('>', next+1); // End of tag
result = result + s.substring (0, i+1);
s = s.substring (i+1);
}
break;
case '\x05':
// Table start
if (!with_tables) {
result = result + s.substring (0, next);
get_out = true;
break;
}
// Fall through
case '\x07':
if (ch == '\x07' && !with_galleries) {
result = result + s.substring (0, next);
get_out = true;
break;
}
case '\x01':
// Start of template, table, or gallery
result = result + s.substring (0, next+1);
push_end (String.fromCharCode(ch.charCodeAt (0)+1).charAt (0));
s = s.substring (next+1);
break;
case '\x06':
// Table end
if (break_at_pipe && endings == null) {
result = result + s.substring (0, next);
get_out = true;
break;
}
// Fall through
case '\x02':
// End of a template or table
result = result + s.substring (0, next);
if (endings == null || endings[endings.length - 1] != ch) {
// Spurious template or table end
if (ch == '\x02')
result = result + '}}';
else
result = result + '|}';
} else {
result = result + pop_end ();
}
s = s.substring (next+1);
break;
case '\x08':
// End of gallery
result = result + s.substring (0, next+1);
if (endings != null && endings[endings.length - 1] == ch) pop_end ();
s = s.substring (next+1);
break;
case '\x03':
case '[':
{
if (!with_links && endings == null) {
get_out = true;
break;
}
// Image links must be treated specially, since they may contain nested links
// in the caption!
var initial = null; // If set, it's 'image:' or 'file:' and we have an image link
i = next;
while (i < s.length && s.charAt (i) == ch) i++;
if (ch == '\x03' && i < s.length && s.charAt (i) == '[') i++;
function get_initial (i, s)
{
for (var j = 0; j < TextCleaner.imgNamespaceNames.length; j++) {
if (s.length >= i + TextCleaner.imgNamespaceNames[j].length + 1) {
var t = s.substr (i, TextCleaner.imgNamespaceNames[j].length + 1);
if (t.toLowerCase() == (TextCleaner.imgNamespaceNames[j].toLowerCase () + ':'))
return t;
}
}
return null;
}
initial = get_initial (i, s);
// Scan ahead. We'll break at the next top-level | or ] or ]] or [ or [[ or {| or |}
var lk_text = sanitize (s.substring (i),
false, // No links at top-level allowed
caption_level + 1,
false, // No thumbs
true, // Break at pipe
false, // No tables
false); // No galleries
var lk_text_length = consumed[caption_level];
j = i + lk_text_length;
if (j >= s.length) {
// Used up the whole text: [[Foo or [bar
if (initial != null && allow_only_thumbs)
// Should in any case have started with [[, not [
result = result + s.substring (0, i-1) + '\x03:' + initial
+ lk_text.substring (initial.length) + '\x04';
else
result = result + s.substring (0, i) + lk_text
+ ((s.charAt (i-1) == '[') ? ']' : '\x04');
s = "";
break;
}
if (s.charAt (j) == '|') k = j; else k = -1;
if (k < 0) {
// No pipe found: we should be on the closing ]] or ] or [[Foo]] or [bar]
if (initial != null && allow_only_thumbs)
// Should in any case have started with [[, not [
result = result + s.substring (0, i-1) + '\x03:' + initial
+ lk_text.substring (initial.length) + '\x04';
else
result = result + s.substring (0, i) + lk_text
+ ((s.charAt (i-1) == '[') ? ']' : '\x04');
if (s.charAt (j) == ']' || s.charAt (j) == '\x04') {
// Indeed closing the link
s = s.substring (j+1);
} else {
s = s.substring (j);
}
break;
} else {
var caption = null;
var used = 0;
// Pipe found.
if (initial == null) {
// Not an image link. Must be something like [[Foo|Bar]].
caption = sanitize
( s.substring (k+1)
, false // No links, please
, caption_level + 1
, false // No thumbs either
, false // Don't care about pipes
, true // Allow tables (yes, parser allows that!)
, true); // Allow galleries (?)
// Now we're at [[, [, ]], or ]
used = consumed[caption_level];
result = result + s.substring (0, i) + lk_text + '|' + caption
+ ((s.charAt (i-1) == '[') ? ']' : '\x04');
} else {
var q = s.substring (k);
// We assume that there are no templates, nowikis, and other nasty things
// in the parameters. Search forward until the next [, {, ], }
l = q.search(/[\x01\x02\x03[\x04\]\{\}\x05\x06\x07\x08]/);
if (l < 0) l = q.length;
if (l+1 < q.length) q = q.substring (0, l+1);
var is_thumb = q.search (/\|\s*thumb(nail)?\s*[\|\x04]/) >= 0;
var img_width = /\|\s*(\d+)px\s*[\|\x04]/.exec (q);
if (img_width && img_width.length > 1) {
img_width = parseInt (img_width[1], 10);
if (isNaN (img_width)) img_width = null;
} else
img_width = null;
if (img_width === null && is_thumb) img_width = 180;
var is_small = img_width < 300;
// Caption starts at the last pipe before l. If that is a parameter,
// it doesn't hurt.
var m = k + q.lastIndexOf ('|', l);
caption = sanitize
( s.substring (m+1)
, is_thumb // Allow links only if it's a thumb
, caption_level + 1
, allow_thumbs && is_thumb
, false // Don't break at pipe
, is_thumb // Tables only if it's a thumb
, is_thumb); // Allow galleries for thumbs (?)
used = consumed[caption_level];
// caption used 'used' chars from m+1, s.charAt (m+1+used) == '\x04'
is_thumb = allow_thumbs && is_small;
if (is_thumb || !allow_only_thumbs)
result = result + s.substring (0, i-1) + '\x03' + lk_text ;
else
result = result + s.substring (0, i-1) + '\x03:' + initial
+ lk_text.substring (initial.length);
result = result + s.substring (k, m+1) + caption + '\x04';
k = m;
}
next = k+1+used;
if (next < s.length) {
if (s.charAt (next) != '\x04')
s = s.substring (next);
else
s = s.substring (next+1);
} else
s = "";
}
break;
}
case '\x04':
case ']':
// Extra bracket.
result = result + s.substring (0, next);
if (caption_level == 0 && !break_at_pipe) {
result = result + (ch == ']' ? ']' : ']]');
s = s.substring (next+1);
} else
get_out = true;
break;
case '|':
result = result + s.substring (0, next);
if (break_at_pipe && endings == null) {
// Pipe character at top level
get_out = true;
} else {
if (caption_level == 0 && !break_at_pipe && endings == null)
result = result + '|'; // Top-level pipe character
else
result = result + '|';
s = s.substring (next+1);
}
break;
} // end switch
} // end while
if (in_nowiki) result = result + "\<\/nowiki>"; // Make sure this nowiki is closed.
// Close open templates and tables
while (endings != null) {
ch = pop_end ();
result = result + (ch == '\x06' ? '\n' : "") + ch;
}
if (caption_level > 0) {
var used_up = initial_length - (get_out ? (s.length - next) : 0);
if (consumed.length < caption_level)
consumed[consumed.length] = used_up;
else
consumed[caption_level-1] = used_up;
}
return result;
}
// Replace multi-character tokens by one-character placeholders, simplifying the
// subsequent processing.
var s = input.replace (/\{\{/g, '\x01')
.replace (/\n\s*\|\}\}\}/g, '\n\x06\x02') // Table end + template end
.replace (/\}\}/g, '\x02')
.replace (/\[\[/g, '\x03')
.replace (/\]\]/g, '\x04')
.replace (/\n\s*\{\|/g, '\n\x05') // Table start and end must be on own line
.replace (/^\s*\{\|/, '\x05') // Table start at the very beginning
.replace (/\n\s*\|\}/g, '\n\x06') // (we strip leading whitespace)
.replace (/\<\s*gallery\s*\>/g, '\x07')
.replace (/\<\/\s*gallery\s*\>/g, '\x08');
s = sanitize (s, true, 0, true, false, true, true);
// with links, allow thumbs, don't break at pipe, allow tables, allow galleries
return s.replace (/\x01/g, '\{\{')
.replace (/\x02/g, '\}\}')
.replace (/\x03/g, '\[\[')
.replace (/\x04/g, '\]\]')
.replace (/\x05/g, '\{\|')
.replace (/\x06/g, '\|\}')
.replace (/\x07/g, '<gallery>')
.replace (/\x08/g, '</gallery>');
}
}
// </source>