init
This commit is contained in:
life
609
public/mdeditor/editor/Markdown.Extra.js
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609
public/mdeditor/editor/Markdown.Extra.js
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(function () {
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// A quick way to make sure we're only keeping span-level tags when we need to.
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// This isn't supposed to be foolproof. It's just a quick way to make sure we
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// keep all span-level tags returned by a pagedown converter. It should allow
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// all span-level tags through, with or without attributes.
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var inlineTags = new RegExp(['^(<\\/?(a|abbr|acronym|applet|area|b|basefont|',
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'bdo|big|button|cite|code|del|dfn|em|figcaption|',
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'font|i|iframe|img|input|ins|kbd|label|map|',
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'mark|meter|object|param|progress|q|ruby|rp|rt|s|',
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'samp|script|select|small|span|strike|strong|',
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'sub|sup|textarea|time|tt|u|var|wbr)[^>]*>|',
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'<(br)\\s?\\/?>)$'].join(''), 'i');
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/******************************************************************
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* Utility Functions *
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*****************************************************************/
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// patch for ie7
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if (!Array.indexOf) {
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Array.prototype.indexOf = function(obj) {
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for (var i = 0; i < this.length; i++) {
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if (this[i] == obj) {
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return i;
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}
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}
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return -1;
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};
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}
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function trim(str) {
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return str.replace(/^\s+|\s+$/g, '');
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}
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function rtrim(str) {
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return str.replace(/\s+$/g, '');
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}
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// Remove one level of indentation from text. Indent is 4 spaces.
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function outdent(text) {
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return text.replace(new RegExp('^(\\t|[ ]{1,4})', 'gm'), '');
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}
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function contains(str, substr) {
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return str.indexOf(substr) != -1;
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}
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// Sanitize html, removing tags that aren't in the whitelist
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function sanitizeHtml(html, whitelist) {
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return html.replace(/<[^>]*>?/gi, function(tag) {
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return tag.match(whitelist) ? tag : '';
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});
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}
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// Merge two arrays, keeping only unique elements.
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function union(x, y) {
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var obj = {};
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for (var i = 0; i < x.length; i++)
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obj[x[i]] = x[i];
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for (i = 0; i < y.length; i++)
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obj[y[i]] = y[i];
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var res = [];
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for (var k in obj) {
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if (obj.hasOwnProperty(k))
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res.push(obj[k]);
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}
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return res;
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}
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// JS regexes don't support \A or \Z, so we add sentinels, as Pagedown
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// does. In this case, we add the ascii codes for start of text (STX) and
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// end of text (ETX), an idea borrowed from:
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// https://github.com/tanakahisateru/js-markdown-extra
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function addAnchors(text) {
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if(text.charAt(0) != '\x02')
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text = '\x02' + text;
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if(text.charAt(text.length - 1) != '\x03')
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text = text + '\x03';
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return text;
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}
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// Remove STX and ETX sentinels.
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function removeAnchors(text) {
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if(text.charAt(0) == '\x02')
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text = text.substr(1);
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if(text.charAt(text.length - 1) == '\x03')
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text = text.substr(0, text.length - 1);
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return text;
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}
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// Convert markdown within an element, retaining only span-level tags
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function convertSpans(text, extra) {
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return sanitizeHtml(convertAll(text, extra), inlineTags);
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}
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// Convert internal markdown using the stock pagedown converter
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function convertAll(text, extra) {
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var result = extra.blockGamutHookCallback(text);
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// We need to perform these operations since we skip the steps in the converter
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result = unescapeSpecialChars(result);
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result = result.replace(/~D/g, "$$").replace(/~T/g, "~");
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result = extra.previousPostConversion(result);
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return result;
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}
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// Convert escaped special characters to HTML decimal entity codes.
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function processEscapes(text) {
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// Markdown extra adds two escapable characters, `:` and `|`
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// If escaped, we convert them to html entities so our
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// regexes don't recognize them. Markdown doesn't support escaping
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// the escape character, e.g. `\\`, which make this even simpler.
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return text.replace(/\\\|/g, '|').replace(/\\:/g, ':');
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}
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// Duplicated from PageDown converter
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function unescapeSpecialChars(text) {
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// Swap back in all the special characters we've hidden.
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text = text.replace(/~E(\d+)E/g, function(wholeMatch, m1) {
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var charCodeToReplace = parseInt(m1);
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return String.fromCharCode(charCodeToReplace);
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});
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return text;
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}
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/*****************************************************************************
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* Markdown.Extra *
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****************************************************************************/
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Markdown.Extra = function() {
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// For converting internal markdown (in tables for instance).
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// This is necessary since these methods are meant to be called as
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// preConversion hooks, and the Markdown converter passed to init()
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// won't convert any markdown contained in the html tags we return.
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this.converter = null;
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// Stores html blocks we generate in hooks so that
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// they're not destroyed if the user is using a sanitizing converter
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this.hashBlocks = [];
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// Special attribute blocks for fenced code blocks and headers enabled.
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this.attributeBlocks = false;
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// Fenced code block options
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this.googleCodePrettify = false;
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this.highlightJs = false;
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// Table options
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this.tableClass = '';
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this.tabWidth = 4;
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};
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Markdown.Extra.init = function(converter, options) {
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// Each call to init creates a new instance of Markdown.Extra so it's
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// safe to have multiple converters, with different options, on a single page
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var extra = new Markdown.Extra();
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var postNormalizationTransformations = [];
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var preBlockGamutTransformations = [];
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var postConversionTransformations = ["unHashExtraBlocks"];
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options = options || {};
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options.extensions = options.extensions || ["all"];
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if (contains(options.extensions, "all")) {
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options.extensions = ["tables", "fenced_code_gfm", "def_list", "attr_list"];
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}
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if (contains(options.extensions, "attr_list")) {
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postNormalizationTransformations.push("hashFcbAttributeBlocks");
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preBlockGamutTransformations.push("hashHeaderAttributeBlocks");
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postConversionTransformations.push("applyAttributeBlocks");
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extra.attributeBlocks = true;
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}
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if (contains(options.extensions, "tables")) {
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preBlockGamutTransformations.push("tables");
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}
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if (contains(options.extensions, "fenced_code_gfm")) {
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postNormalizationTransformations.push("fencedCodeBlocks");
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}
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if (contains(options.extensions, "def_list")) {
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preBlockGamutTransformations.push("definitionLists");
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}
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converter.hooks.chain("postNormalization", function(text) {
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return extra.doTransform(postNormalizationTransformations, text) + '\n';
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});
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converter.hooks.chain("preBlockGamut", function(text, blockGamutHookCallback) {
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// Keep a reference to the block gamut callback to run recursively
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extra.blockGamutHookCallback = blockGamutHookCallback;
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text = processEscapes(text);
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return extra.doTransform(preBlockGamutTransformations, text) + '\n';
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});
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// Keep a reference to the hook chain running before doPostConversion to apply on hashed extra blocks
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extra.previousPostConversion = converter.hooks.postConversion;
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converter.hooks.chain("postConversion", function(text) {
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text = extra.doTransform(postConversionTransformations, text);
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// Clear state vars that may use unnecessary memory
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this.hashBlocks = [];
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return text;
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});
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if ("highlighter" in options) {
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extra.googleCodePrettify = options.highlighter === 'prettify';
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extra.highlightJs = options.highlighter === 'highlight';
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}
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if ("table_class" in options) {
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extra.tableClass = options.table_class;
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}
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extra.converter = converter;
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// Caller usually won't need this, but it's handy for testing.
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return extra;
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};
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// Do transformations
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Markdown.Extra.prototype.doTransform = function(transformations, text) {
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for(var i = 0; i < transformations.length; i++)
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text = this[transformations[i]](text);
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return text;
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};
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// Return a placeholder containing a key, which is the block's index in the
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// hashBlocks array. We wrap our output in a <p> tag here so Pagedown won't.
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Markdown.Extra.prototype.hashExtraBlock = function(block) {
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return '\n<p>~X' + (this.hashBlocks.push(block) - 1) + 'X</p>\n';
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};
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// Replace placeholder blocks in `text` with their corresponding
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// html blocks in the hashBlocks array.
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Markdown.Extra.prototype.unHashExtraBlocks = function(text) {
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var self = this;
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function recursiveUnHash() {
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var hasHash = false;
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text = text.replace(/<p>~X(\d+)X<\/p>/g, function(wholeMatch, m1) {
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hasHash = true;
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var key = parseInt(m1, 10);
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return self.hashBlocks[key];
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});
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if(hasHash === true) {
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recursiveUnHash();
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}
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}
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recursiveUnHash();
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return text;
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};
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/******************************************************************
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* Attribute Blocks *
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*****************************************************************/
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// Extract headers attribute blocks, move them above the element they will be
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// applied to, and hash them for later.
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Markdown.Extra.prototype.hashHeaderAttributeBlocks = function(text) {
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// TODO: use sentinels. Should we just add/remove them in doConversion?
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// TODO: better matches for id / class attributes
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var attrBlock = "\\{\\s*[.|#][^}]+\\}";
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var hdrAttributesA = new RegExp("^(#{1,6}.*#{0,6})\\s+(" + attrBlock + ")[ \\t]*(\\n|0x03)", "gm");
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var hdrAttributesB = new RegExp("^(.*)\\s+(" + attrBlock + ")[ \\t]*\\n" +
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"(?=[\\-|=]+\\s*(\\n|0x03))", "gm"); // underline lookahead
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var self = this;
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function attributeCallback(wholeMatch, pre, attr) {
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return '<p>~XX' + (self.hashBlocks.push(attr) - 1) + 'XX</p>\n' + pre + "\n";
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}
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text = text.replace(hdrAttributesA, attributeCallback); // ## headers
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text = text.replace(hdrAttributesB, attributeCallback); // underline headers
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return text;
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};
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// Extract FCB attribute blocks, move them above the element they will be
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// applied to, and hash them for later.
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Markdown.Extra.prototype.hashFcbAttributeBlocks = function(text) {
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// TODO: use sentinels. Should we just add/remove them in doConversion?
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// TODO: better matches for id / class attributes
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var attrBlock = "\\{\\s*[.|#][^}]+\\}";
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var fcbAttributes = new RegExp("^(```[^{]*)\\s+(" + attrBlock + ")[ \\t]*\\n" +
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"(?=([\\s\\S]*?)\\n```\\s*(\\n|0x03))", "gm");
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var self = this;
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function attributeCallback(wholeMatch, pre, attr) {
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return '<p>~XX' + (self.hashBlocks.push(attr) - 1) + 'XX</p>\n' + pre + "\n";
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}
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return text.replace(fcbAttributes, attributeCallback);
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};
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Markdown.Extra.prototype.applyAttributeBlocks = function(text) {
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var self = this;
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var blockRe = new RegExp('<p>~XX(\\d+)XX</p>[\\s]*' +
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'(?:<(h[1-6]|pre)(?: +class="(\\S+)")?(>[\\s\\S]*?</\\2>))', "gm");
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text = text.replace(blockRe, function(wholeMatch, k, tag, cls, rest) {
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if (!tag) // no following header or fenced code block.
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return '';
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// get attributes list from hash
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var key = parseInt(k, 10);
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var attributes = self.hashBlocks[key];
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// get id
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var id = attributes.match(/#[^\s{}]+/g) || [];
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var idStr = id[0] ? ' id="' + id[0].substr(1, id[0].length - 1) + '"' : '';
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// get classes and merge with existing classes
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var classes = attributes.match(/\.[^\s{}]+/g) || [];
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for (var i = 0; i < classes.length; i++) // Remove leading dot
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classes[i] = classes[i].substr(1, classes[i].length - 1);
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var classStr = '';
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if (cls)
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classes = union(classes, [cls]);
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if (classes.length > 0)
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classStr = ' class="' + classes.join(' ') + '"';
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return "<" + tag + idStr + classStr + rest;
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});
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return text;
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};
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/******************************************************************
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* Tables *
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*****************************************************************/
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// Find and convert Markdown Extra tables into html.
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Markdown.Extra.prototype.tables = function(text) {
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var self = this;
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var leadingPipe = new RegExp(
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['^' ,
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'[ ]{0,3}' , // Allowed whitespace
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'[|]' , // Initial pipe
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'(.+)\\n' , // $1: Header Row
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'[ ]{0,3}' , // Allowed whitespace
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'[|]([ ]*[-:]+[-| :]*)\\n' , // $2: Separator
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'(' , // $3: Table Body
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'(?:[ ]*[|].*\\n?)*' , // Table rows
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')',
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'(?:\\n|$)' // Stop at final newline
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].join(''),
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'gm'
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);
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var noLeadingPipe = new RegExp(
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['^' ,
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'[ ]{0,3}' , // Allowed whitespace
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'(\\S.*[|].*)\\n' , // $1: Header Row
|
||||
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||||
'[ ]{0,3}' , // Allowed whitespace
|
||||
'([-:]+[ ]*[|][-| :]*)\\n' , // $2: Separator
|
||||
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||||
'(' , // $3: Table Body
|
||||
'(?:.*[|].*\\n?)*' , // Table rows
|
||||
')' ,
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||||
'(?:\\n|$)' // Stop at final newline
|
||||
].join(''),
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||||
'gm'
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);
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||||
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||||
text = text.replace(leadingPipe, doTable);
|
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text = text.replace(noLeadingPipe, doTable);
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// $1 = header, $2 = separator, $3 = body
|
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function doTable(match, header, separator, body, offset, string) {
|
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// remove any leading pipes and whitespace
|
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header = header.replace(/^ *[|]/m, '');
|
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separator = separator.replace(/^ *[|]/m, '');
|
||||
body = body.replace(/^ *[|]/gm, '');
|
||||
|
||||
// remove trailing pipes and whitespace
|
||||
header = header.replace(/[|] *$/m, '');
|
||||
separator = separator.replace(/[|] *$/m, '');
|
||||
body = body.replace(/[|] *$/gm, '');
|
||||
|
||||
// determine column alignments
|
||||
alignspecs = separator.split(/ *[|] */);
|
||||
align = [];
|
||||
for (var i = 0; i < alignspecs.length; i++) {
|
||||
var spec = alignspecs[i];
|
||||
if (spec.match(/^ *-+: *$/m))
|
||||
align[i] = ' style="text-align:right;"';
|
||||
else if (spec.match(/^ *:-+: *$/m))
|
||||
align[i] = ' style="text-align:center;"';
|
||||
else if (spec.match(/^ *:-+ *$/m))
|
||||
align[i] = ' style="text-align:left;"';
|
||||
else align[i] = '';
|
||||
}
|
||||
|
||||
// TODO: parse spans in header and rows before splitting, so that pipes
|
||||
// inside of tags are not interpreted as separators
|
||||
var headers = header.split(/ *[|] */);
|
||||
var colCount = headers.length;
|
||||
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||||
// build html
|
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var cls = self.tableClass ? ' class="' + self.tableClass + '"' : '';
|
||||
var html = ['<table', cls, '>\n', '<thead>\n', '<tr>\n'].join('');
|
||||
|
||||
// build column headers.
|
||||
for (i = 0; i < colCount; i++) {
|
||||
var headerHtml = convertSpans(trim(headers[i]), self);
|
||||
html += [" <th", align[i], ">", headerHtml, "</th>\n"].join('');
|
||||
}
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html += "</tr>\n</thead>\n";
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||||
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||||
// build rows
|
||||
var rows = body.split('\n');
|
||||
for (i = 0; i < rows.length; i++) {
|
||||
if (rows[i].match(/^\s*$/)) // can apply to final row
|
||||
continue;
|
||||
|
||||
// ensure number of rowCells matches colCount
|
||||
var rowCells = rows[i].split(/ *[|] */);
|
||||
var lenDiff = colCount - rowCells.length;
|
||||
for (var j = 0; j < lenDiff; j++)
|
||||
rowCells.push('');
|
||||
|
||||
html += "<tr>\n";
|
||||
for (j = 0; j < colCount; j++) {
|
||||
var colHtml = convertSpans(trim(rowCells[j]), self);
|
||||
html += [" <td", align[j], ">", colHtml, "</td>\n"].join('');
|
||||
}
|
||||
html += "</tr>\n";
|
||||
}
|
||||
|
||||
html += "</table>\n";
|
||||
|
||||
// replace html with placeholder until postConversion step
|
||||
return self.hashExtraBlock(html);
|
||||
}
|
||||
|
||||
return text;
|
||||
};
|
||||
|
||||
|
||||
/******************************************************************
|
||||
* Fenced Code Blocks (gfm) *
|
||||
******************************************************************/
|
||||
|
||||
// Find and convert gfm-inspired fenced code blocks into html.
|
||||
Markdown.Extra.prototype.fencedCodeBlocks = function(text) {
|
||||
function encodeCode(code) {
|
||||
code = code.replace(/&/g, "&");
|
||||
code = code.replace(/</g, "<");
|
||||
code = code.replace(/>/g, ">");
|
||||
// These were escaped by PageDown before postNormalization
|
||||
code = code.replace(/~D/g, "$$");
|
||||
code = code.replace(/~T/g, "~");
|
||||
return code;
|
||||
}
|
||||
|
||||
var self = this;
|
||||
text = text.replace(/(?:^|\n)```(.*)\n([\s\S]*?)\n```/g, function(match, m1, m2) {
|
||||
var language = m1, codeblock = m2;
|
||||
|
||||
// adhere to specified options
|
||||
var preclass = self.googleCodePrettify ? ' class="prettyprint"' : '';
|
||||
var codeclass = '';
|
||||
if (language) {
|
||||
if (self.googleCodePrettify || self.highlightJs) {
|
||||
// use html5 language- class names. supported by both prettify and highlight.js
|
||||
codeclass = ' class="language-' + language + '"';
|
||||
} else {
|
||||
codeclass = ' class="' + language + '"';
|
||||
}
|
||||
}
|
||||
|
||||
var html = ['<pre', preclass, '><code', codeclass, '>',
|
||||
encodeCode(codeblock), '</code></pre>'].join('');
|
||||
|
||||
// replace codeblock with placeholder until postConversion step
|
||||
return self.hashExtraBlock(html);
|
||||
});
|
||||
|
||||
return text;
|
||||
};
|
||||
|
||||
|
||||
/******************************************************************
|
||||
* Definition Lists *
|
||||
******************************************************************/
|
||||
|
||||
// Find and convert markdown extra definition lists into html.
|
||||
Markdown.Extra.prototype.definitionLists = function(text) {
|
||||
var wholeList = new RegExp(
|
||||
['(\\x02\\n?|\\n\\n)' ,
|
||||
'(?:' ,
|
||||
'(' , // $1 = whole list
|
||||
'(' , // $2
|
||||
'[ ]{0,3}' ,
|
||||
'((?:[ \\t]*\\S.*\\n)+)', // $3 = defined term
|
||||
'\\n?' ,
|
||||
'[ ]{0,3}:[ ]+' , // colon starting definition
|
||||
')' ,
|
||||
'([\\s\\S]+?)' ,
|
||||
'(' , // $4
|
||||
'(?=\\0x03)' , // \z
|
||||
'|' ,
|
||||
'(?=' ,
|
||||
'\\n{2,}' ,
|
||||
'(?=\\S)' ,
|
||||
'(?!' , // Negative lookahead for another term
|
||||
'[ ]{0,3}' ,
|
||||
'(?:\\S.*\\n)+?' , // defined term
|
||||
'\\n?' ,
|
||||
'[ ]{0,3}:[ ]+' , // colon starting definition
|
||||
')' ,
|
||||
'(?!' , // Negative lookahead for another definition
|
||||
'[ ]{0,3}:[ ]+' , // colon starting definition
|
||||
')' ,
|
||||
')' ,
|
||||
')' ,
|
||||
')' ,
|
||||
')'
|
||||
].join(''),
|
||||
'gm'
|
||||
);
|
||||
|
||||
var self = this;
|
||||
text = addAnchors(text);
|
||||
|
||||
text = text.replace(wholeList, function(match, pre, list) {
|
||||
var result = trim(self.processDefListItems(list));
|
||||
result = "<dl>\n" + result + "\n</dl>";
|
||||
return pre + self.hashExtraBlock(result) + "\n\n";
|
||||
});
|
||||
|
||||
return removeAnchors(text);
|
||||
};
|
||||
|
||||
// Process the contents of a single definition list, splitting it
|
||||
// into individual term and definition list items.
|
||||
Markdown.Extra.prototype.processDefListItems = function(listStr) {
|
||||
var self = this;
|
||||
|
||||
var dt = new RegExp(
|
||||
['(\\x02\\n?|\\n\\n+)' , // leading line
|
||||
'(' , // definition terms = $1
|
||||
'[ ]{0,3}' , // leading whitespace
|
||||
'(?![:][ ]|[ ])' , // negative lookahead for a definition
|
||||
// mark (colon) or more whitespace
|
||||
'(?:\\S.*\\n)+?' , // actual term (not whitespace)
|
||||
')' ,
|
||||
'(?=\\n?[ ]{0,3}:[ ])' // lookahead for following line feed
|
||||
].join(''), // with a definition mark
|
||||
'gm'
|
||||
);
|
||||
|
||||
var dd = new RegExp(
|
||||
['\\n(\\n+)?' , // leading line = $1
|
||||
'(' , // marker space = $2
|
||||
'[ ]{0,3}' , // whitespace before colon
|
||||
'[:][ ]+' , // definition mark (colon)
|
||||
')' ,
|
||||
'([\\s\\S]+?)' , // definition text = $3
|
||||
'(?=\\n*' , // stop at next definition mark,
|
||||
'(?:' , // next term or end of text
|
||||
'\\n[ ]{0,3}[:][ ]|' ,
|
||||
'<dt>|\\x03' , // \z
|
||||
')' ,
|
||||
')'
|
||||
].join(''),
|
||||
'gm'
|
||||
);
|
||||
|
||||
listStr = addAnchors(listStr);
|
||||
// trim trailing blank lines:
|
||||
listStr = listStr.replace(/\n{2,}(?=\\x03)/, "\n");
|
||||
|
||||
// Process definition terms.
|
||||
listStr = listStr.replace(dt, function(match, pre, termsStr) {
|
||||
var terms = trim(termsStr).split("\n");
|
||||
var text = '';
|
||||
for (var i = 0; i < terms.length; i++) {
|
||||
var term = terms[i];
|
||||
// process spans inside dt
|
||||
term = convertSpans(trim(term), self);
|
||||
text += "\n<dt>" + term + "</dt>";
|
||||
}
|
||||
return text + "\n";
|
||||
});
|
||||
|
||||
// Process actual definitions.
|
||||
listStr = listStr.replace(dd, function(match, leadingLine, markerSpace, def) {
|
||||
if (leadingLine || def.match(/\n{2,}/)) {
|
||||
// replace marker with the appropriate whitespace indentation
|
||||
def = Array(markerSpace.length + 1).join(' ') + def;
|
||||
// process markdown inside definition
|
||||
// TODO?: currently doesn't apply extensions
|
||||
def = outdent(def) + "\n\n";
|
||||
def = "\n" + convertAll(def, self) + "\n";
|
||||
} else {
|
||||
// convert span-level markdown inside definition
|
||||
def = rtrim(def);
|
||||
def = convertSpans(outdent(def), self);
|
||||
}
|
||||
|
||||
return "\n<dd>" + def + "</dd>\n";
|
||||
});
|
||||
|
||||
return removeAnchors(listStr);
|
||||
};
|
||||
|
||||
})();
|
||||
|
||||
Reference in New Issue
Block a user