Markdown parser, done right. 100% CommonMark support, extensions, syntax plugins & high speed
https://markdown-it.github.io/
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369 lines
10 KiB
369 lines
10 KiB
(function () {
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'use strict';
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/*eslint-env browser*/
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/*global $, _*/
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var mdHtml, mdSrc, permalink, scrollMap;
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var defaults = {
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html: false, // Enable HTML tags in source
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xhtmlOut: false, // Use '/' to close single tags (<br />)
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breaks: false, // Convert '\n' in paragraphs into <br>
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langPrefix: 'language-', // CSS language prefix for fenced blocks
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linkify: true, // autoconvert URL-like texts to links
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typographer: true, // Enable smartypants and other sweet transforms
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// options below are for demo only
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_highlight: true,
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_strict: false,
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_view: 'html' // html / src / debug
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};
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defaults.highlight = function (str, lang) {
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if (!defaults._highlight || !window.hljs) { return ''; }
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var hljs = window.hljs;
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if (lang && hljs.getLanguage(lang)) {
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try {
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return hljs.highlight(lang, str).value;
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} catch (__) {}
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}
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try {
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return hljs.highlightAuto(str).value;
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} catch (__) {}
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return '';
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};
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function setOptionClass(name, val) {
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if (val) {
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$('body').addClass('opt_' + name);
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} else {
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$('body').removeClass('opt_' + name);
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}
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}
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function setResultView(val) {
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$('body').removeClass('result-as-html');
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$('body').removeClass('result-as-src');
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$('body').removeClass('result-as-debug');
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$('body').addClass('result-as-' + val);
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defaults._view = val;
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}
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function mdInit() {
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if (defaults._strict) {
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mdHtml = window.markdownit('commonmark');
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mdSrc = window.markdownit('commonmark');
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} else {
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mdHtml = window.markdownit(defaults)
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.use(window.markdownitAbbr)
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.use(window.markdownitDeflist)
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.use(window.markdownitEmoji)
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.use(window.markdownitFootnote)
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.use(window.markdownitIns)
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.use(window.markdownitMark)
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.use(window.markdownitSub)
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.use(window.markdownitSup);
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mdSrc = window.markdownit(defaults)
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.use(window.markdownitAbbr)
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.use(window.markdownitDeflist)
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.use(window.markdownitEmoji)
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.use(window.markdownitFootnote)
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.use(window.markdownitIns)
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.use(window.markdownitMark)
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.use(window.markdownitSub)
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.use(window.markdownitSup);
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}
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// Beautify output of parser for html content
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mdHtml.renderer.rules.table_open = function () {
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return '<table class="table table-striped">\n';
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};
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// Replace emoji codes with images
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mdHtml.renderer.rules.emoji = function(token, idx) {
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return window.twemoji.parse(token[idx].to);
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};
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//
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// Inject line numbers for sync scroll. Notes:
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//
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// - We track only headings and paragraphs on first level. That's enougth.
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// - Footnotes content causes jumps. Level limit filter it automatically.
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//
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mdHtml.renderer.rules.paragraph_open = function (tokens, idx) {
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var line;
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if (tokens[idx].lines && tokens[idx].level === 0) {
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line = tokens[idx].lines[0];
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return '<p class="line" data-line="' + line + '">';
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}
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return '<p>';
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};
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mdHtml.renderer.rules.heading_open = function (tokens, idx) {
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var line;
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if (tokens[idx].lines && tokens[idx].level === 0) {
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line = tokens[idx].lines[0];
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return '<h' + tokens[idx].hLevel + ' class="line" data-line="' + line + '">';
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}
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return '<h' + tokens[idx].hLevel + '>';
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};
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}
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function setHighlightedlContent(selector, content, lang) {
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if (window.hljs) {
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$(selector).html(window.hljs.highlight(lang, content).value);
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} else {
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$(selector).text(content);
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}
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}
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function updateResult() {
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var source = $('.source').val();
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// Update only active view to avoid slowdowns
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// (debug & src view with highlighting are a bit slow)
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if (defaults._view === 'src') {
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setHighlightedlContent('.result-src-content', mdSrc.render(source), 'html');
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} else if (defaults._view === 'debug') {
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setHighlightedlContent(
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'.result-debug-content',
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JSON.stringify(mdSrc.parse(source, { references: {} }), null, 2),
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'json'
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);
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} else { /*defaults._view === 'html'*/
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$('.result-html').html(mdHtml.render(source));
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}
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// reset lines mapping cache on content update
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scrollMap = null;
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try {
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if (source) {
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// serialize state - source and options
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permalink.href = '#md64=' + window.btoa(JSON.stringify({
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source: source,
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defaults: _.omit(defaults, 'highlight')
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}));
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} else {
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permalink.href = '';
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}
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} catch (__) {
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permalink.href = '';
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}
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}
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// Build offsets for each line (lines can be wrapped)
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// That's a bit dirty to process each line everytime, but ok for demo.
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// Optimizations are required only for big texts.
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function buildScrollMap() {
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var i, offset, nonEmptyList, pos, a, b, lineHeightMap, linesCount,
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acc, sourceLikeDiv, textarea = $('.source'),
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_scrollMap;
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sourceLikeDiv = $('<div />').css({
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position: 'absolute',
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visibility: 'hidden',
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height: 'auto',
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width: textarea[0].clientWidth,
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'font-size': textarea.css('font-size'),
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'font-family': textarea.css('font-family'),
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'line-height': textarea.css('line-height'),
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'white-space': textarea.css('white-space')
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}).appendTo('body');
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offset = $('.result-html').scrollTop() - $('.result-html').offset().top;
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_scrollMap = [];
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nonEmptyList = [];
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lineHeightMap = [];
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acc = 0;
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textarea.val().split('\n').forEach(function(str) {
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var h, lh;
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lineHeightMap.push(acc);
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if (str.length === 0) {
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acc++;
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return;
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}
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sourceLikeDiv.text(str);
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h = parseFloat(sourceLikeDiv.css('height'));
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lh = parseFloat(sourceLikeDiv.css('line-height'));
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acc += Math.round(h / lh);
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});
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sourceLikeDiv.remove();
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lineHeightMap.push(acc);
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linesCount = acc;
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for (i = 0; i < linesCount; i++) { _scrollMap.push(-1); }
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nonEmptyList.push(0);
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_scrollMap[0] = 0;
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$('.line').each(function(n, el) {
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var $el = $(el), t = $el.data('line');
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if (t === '') { return; }
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t = lineHeightMap[t];
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if (t !== 0) { nonEmptyList.push(t); }
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_scrollMap[t] = Math.round($el.offset().top + offset);
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});
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nonEmptyList.push(linesCount);
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_scrollMap[linesCount] = $('.result-html')[0].scrollHeight;
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pos = 0;
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for (i = 1; i < linesCount; i++) {
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if (_scrollMap[i] !== -1) {
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pos++;
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continue;
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}
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a = nonEmptyList[pos];
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b = nonEmptyList[pos + 1];
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_scrollMap[i] = Math.round((_scrollMap[b] * (i - a) + _scrollMap[a] * (b - i)) / (b - a));
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}
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return _scrollMap;
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}
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function syncScroll() {
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var textarea = $('.source'),
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lineHeight = parseFloat(textarea.css('line-height')),
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lineNo, posTo;
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lineNo = Math.floor(textarea.scrollTop() / lineHeight);
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if (!scrollMap) { scrollMap = buildScrollMap(); }
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posTo = scrollMap[lineNo];
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$('.result-html').stop(true).animate({
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scrollTop: posTo
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}, 100, 'linear');
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}
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//////////////////////////////////////////////////////////////////////////////
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// Init on page load
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//
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$(function() {
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// highlight snippet
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if (window.hljs) {
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$('pre.code-sample code').each(function(i, block) {
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window.hljs.highlightBlock(block);
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});
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}
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// Restore content if opened by permalink
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if (location.hash && /^(#md=|#md64=)/.test(location.hash)) {
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try {
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var cfg;
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if (/^#md64=/.test(location.hash)) {
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cfg = JSON.parse(window.atob(location.hash.slice(6)));
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} else {
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// Legacy mode for old links. Those become broken in github posts,
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// so we switched to base64 encoding.
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cfg = JSON.parse(decodeURIComponent(location.hash.slice(4)));
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}
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if (_.isString(cfg.source)) {
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$('.source').val(cfg.source);
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}
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var opts = _.isObject(cfg.defaults) ? cfg.defaults : {};
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// copy config to defaults, but only if key exists
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// and value has the same type
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_.forOwn(opts, function (val, key) {
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if (!_.has(defaults, key)) { return; }
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// Legacy, for old links
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if (key === '_src') {
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defaults._view = val ? 'src' : 'html';
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return;
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}
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if ((_.isBoolean(defaults[key]) && _.isBoolean(val)) ||
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(_.isString(defaults[key]) && _.isString(val))) {
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defaults[key] = val;
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}
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});
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// sanitize for sure
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if ([ 'html', 'src', 'debug' ].indexOf(defaults._view) === -1) {
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defaults._view = 'html';
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}
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} catch (__) {}
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}
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// Activate tooltips
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$('._tip').tooltip({ container: 'body' });
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// Set default option values and option listeners
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_.forOwn(defaults, function (val, key) {
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if (key === 'highlight') { return; }
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var el = document.getElementById(key);
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if (!el) { return; }
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var $el = $(el);
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if (_.isBoolean(val)) {
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$el.prop('checked', val);
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$el.on('change', function () {
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var value = Boolean($el.prop('checked'));
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setOptionClass(key, value);
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defaults[key] = value;
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mdInit();
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updateResult();
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});
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setOptionClass(key, val);
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} else {
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$(el).val(val);
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$el.on('change update keyup', function () {
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defaults[key] = String($(el).val());
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mdInit();
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updateResult();
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});
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}
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});
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setResultView(defaults._view);
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mdInit();
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permalink = document.getElementById('permalink');
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// Setup listeners
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$('.source').on('keyup paste cut mouseup', _.debounce(updateResult, 300, { maxWait: 500 }));
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$('.source').on('scroll', _.debounce(syncScroll, 50, { maxWait: 50 }));
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$('.source-clear').on('click', function (event) {
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$('.source').val('');
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updateResult();
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event.preventDefault();
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});
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$(document).on('click', '[data-result-as]', function (event) {
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var view = $(this).data('resultAs');
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if (view) {
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setResultView(view);
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// only to update permalink
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updateResult();
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event.preventDefault();
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}
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});
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// Need to recalculate line positions on window resize
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$(window).on('resize', function () {
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scrollMap = null;
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});
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updateResult();
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});
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})();
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