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