realms-wiki/realms/static/js/wmd.js
2014-09-03 21:29:47 -05:00

196 lines
5.3 KiB
JavaScript

/*!
* WMD - Wanton Markdown
* Copyright (c) 2010 Caolan McMahon
*/
/*
* Fork of https://github.com/caolan/wmd
*/
function escapeHtml(s) {
s = ('' + s); /* Coerce to string */
s = s.replace(/&/g, '&');
s = s.replace(/</g, '&lt;');
s = s.replace(/>/g, '&gt;');
s = s.replace(/"/g, '&quot;');
s = s.replace(/'/g, '&#39;');
return s;
}
/**
* Main function for converting markdown to HTML.
*
* @param {String} content
* @param {Object} options
* @return {String}
* @api public
*/
var WMD = {};
WMD.convert = function(content, options) {
var doc = {raw: content, markdown: content};
var opt = WMD.readOptions(options);
WMD.preprocess(doc, opt);
doc.html = WMD.processor(doc.markdown, true);
WMD.postprocess(doc, opt);
doc.toString = function () {
return doc.html;
};
return doc;
};
function gsub(str, regex, fn, /*optional*/newstr) {
newstr = newstr || '';
var re = new RegExp(regex);
var match = re.exec(str);
var remaining;
if (match) {
newstr += str.slice(0, match.index);
newstr += fn.apply(null, match);
remaining = str.slice(match.index + match[0].length);
return gsub(remaining, re, fn, newstr);
}
return newstr + str;
}
WMD.showdown = new Showdown.converter({extensions: ['table']});
WMD.processor = WMD.showdown.makeHtml;
WMD.preprocessors = {
underscores: function (doc) {
// prevent foo_bar_baz from ending up with an italic word in the middle
doc.markdown = gsub(doc.markdown,
"/(^(?! {4}|\t)\w+_\w+_\w[\w_]*)/", function (match) {
var count = 0;
for (var i = 0; i < match.length; i++) {
if (match[i] == '_') count++;
}
if (count === 2) {
return match.replace(/_/g, '\\_');
}
return match;
}
);
return doc;
},
metadata: function (doc) {
var key;
var lines = doc.markdown.split('\n');
doc.metadata = {};
while (lines.length) {
var match = /^(\S+):\s+(.*)$/.exec(lines[0]);
if (match) {
key = match[1];
doc.metadata[key] = match[2];
lines.shift();
}
else {
var continued_value = /^\s+(.+)$/.exec(lines[0]);
// strip empty lines
if (/^\s*$/.exec(lines[0])) {
lines.shift();
}
else if (continued_value && key) {
doc.metadata[key] += '\n' + continued_value[1];
lines.shift();
}
else break;
}
}
doc.markdown = lines.join('\n');
return doc;
},
fencedCodeBlocksHighlightJS: function (doc) {
var re1 = /```([A-Za-z]+)\s*([\s\S]+?)```/; // with syntax highlighting
var re2 = /```\s*([\s\S]+?)```/; // without syntax highlighting
var block;
while (block = re1.exec(doc.markdown) || re2.exec(doc.markdown)) {
var pre;
if (block.length === 3) {
// we have a code format
pre = '<pre style="padding:0;"><code class="' + escapeHtml(block[1]) + '">';
if (block[1] in hljs.LANGUAGES) {
pre += hljs.highlight(block[1], block[2]).value;
}
else {
pre += escapeHtml(block[2]);
}
pre += '</code></pre>';
}
else {
// no syntax highlighting
pre = '<pre style="padding:0;"><code class="no-highlight">' +
escapeHtml(block[1]) + '</code></pre>';
}
doc.markdown = doc.markdown.substr(0, block.index) +
pre + doc.markdown.substr(block.index + block[0].length);
}
return doc;
}
};
WMD.postprocessors = {};
/**
* Extends a default set of options with those passed to it.
*
* @param {Object} options
* @return {Object}
* @api public
*/
WMD.readOptions = function (options) {
var obj = {
preprocessors: [
WMD.preprocessors.metadata,
WMD.preprocessors.underscores,
WMD.preprocessors.fencedCodeBlocksHighlightJS
],
postprocessors: [
]
};
for (var k in options) {
obj[k] = options[k];
}
return obj;
};
/**
* Runs all the preprocessors defined in options on the doc object.
* This is executed before passing the doc's markdown property to the processor
* function to be turned into HTML.
*
* @param {Object} doc
* @param {Object} options
* @return {String}
* @api public
*/
WMD.preprocess = function (doc, options) {
return options.preprocessors.reduce(function (doc, fn) {
return fn(doc);
}, doc);
};
/**
* Runs all the postprocessors defined in options on the doc object.
* This is executed after passing the doc's markdown property to the processor
* function to be turned into HTML.
*
* @param {Object} doc
* @param {Object} options
* @return {String}
* @api public
*/
WMD.postprocess = function (doc, options) {
return options.postprocessors.reduce(function (doc, fn) {
return fn(doc);
}, doc);
};