mirror of https://github.com/mindoc-org/mindoc.git
974 lines
30 KiB
Go
974 lines
30 KiB
Go
var TurndownService = (function () {
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'use strict';
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function extend (destination) {
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for (var i = 1; i < arguments.length; i++) {
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var source = arguments[i];
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for (var key in source) {
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if (source.hasOwnProperty(key)) destination[key] = source[key];
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}
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}
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return destination
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}
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function repeat (character, count) {
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return Array(count + 1).join(character)
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}
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function trimLeadingNewlines (string) {
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return string.replace(/^\n*/, '')
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}
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function trimTrailingNewlines (string) {
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// avoid match-at-end regexp bottleneck, see #370
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var indexEnd = string.length;
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while (indexEnd > 0 && string[indexEnd - 1] === '\n') indexEnd--;
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return string.substring(0, indexEnd)
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}
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var blockElements = [
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'ADDRESS', 'ARTICLE', 'ASIDE', 'AUDIO', 'BLOCKQUOTE', 'BODY', 'CANVAS',
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'CENTER', 'DD', 'DIR', 'DIV', 'DL', 'DT', 'FIELDSET', 'FIGCAPTION', 'FIGURE',
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'FOOTER', 'FORM', 'FRAMESET', 'H1', 'H2', 'H3', 'H4', 'H5', 'H6', 'HEADER',
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'HGROUP', 'HR', 'HTML', 'ISINDEX', 'LI', 'MAIN', 'MENU', 'NAV', 'NOFRAMES',
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'NOSCRIPT', 'OL', 'OUTPUT', 'P', 'PRE', 'SECTION', 'TABLE', 'TBODY', 'TD',
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'TFOOT', 'TH', 'THEAD', 'TR', 'UL'
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];
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function isBlock (node) {
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return is(node, blockElements)
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}
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var voidElements = [
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'AREA', 'BASE', 'BR', 'COL', 'COMMAND', 'EMBED', 'HR', 'IMG', 'INPUT',
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'KEYGEN', 'LINK', 'META', 'PARAM', 'SOURCE', 'TRACK', 'WBR'
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];
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function isVoid (node) {
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return is(node, voidElements)
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}
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function hasVoid (node) {
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return has(node, voidElements)
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}
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var meaningfulWhenBlankElements = [
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'A', 'TABLE', 'THEAD', 'TBODY', 'TFOOT', 'TH', 'TD', 'IFRAME', 'SCRIPT',
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'AUDIO', 'VIDEO'
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];
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function isMeaningfulWhenBlank (node) {
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return is(node, meaningfulWhenBlankElements)
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}
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function hasMeaningfulWhenBlank (node) {
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return has(node, meaningfulWhenBlankElements)
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}
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function is (node, tagNames) {
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return tagNames.indexOf(node.nodeName) >= 0
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}
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function has (node, tagNames) {
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return (
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node.getElementsByTagName &&
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tagNames.some(function (tagName) {
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return node.getElementsByTagName(tagName).length
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})
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)
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}
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var rules = {};
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rules.paragraph = {
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filter: 'p',
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replacement: function (content) {
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return '\n\n' + content + '\n\n'
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}
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};
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rules.lineBreak = {
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filter: 'br',
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replacement: function (content, node, options) {
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return options.br + '\n'
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}
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};
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rules.heading = {
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filter: ['h1', 'h2', 'h3', 'h4', 'h5', 'h6'],
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replacement: function (content, node, options) {
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var hLevel = Number(node.nodeName.charAt(1));
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if (options.headingStyle === 'setext' && hLevel < 3) {
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var underline = repeat((hLevel === 1 ? '=' : '-'), content.length);
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return (
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'\n\n' + content + '\n' + underline + '\n\n'
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)
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} else {
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return '\n\n' + repeat('#', hLevel) + ' ' + content + '\n\n'
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}
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}
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};
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rules.blockquote = {
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filter: 'blockquote',
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replacement: function (content) {
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content = content.replace(/^\n+|\n+$/g, '');
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content = content.replace(/^/gm, '> ');
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return '\n\n' + content + '\n\n'
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}
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};
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rules.list = {
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filter: ['ul', 'ol'],
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replacement: function (content, node) {
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var parent = node.parentNode;
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if (parent.nodeName === 'LI' && parent.lastElementChild === node) {
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return '\n' + content
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} else {
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return '\n\n' + content + '\n\n'
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}
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}
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};
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rules.listItem = {
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filter: 'li',
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replacement: function (content, node, options) {
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content = content
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.replace(/^\n+/, '') // remove leading newlines
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.replace(/\n+$/, '\n') // replace trailing newlines with just a single one
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.replace(/\n/gm, '\n '); // indent
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var prefix = options.bulletListMarker + ' ';
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var parent = node.parentNode;
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if (parent.nodeName === 'OL') {
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var start = parent.getAttribute('start');
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var index = Array.prototype.indexOf.call(parent.children, node);
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prefix = (start ? Number(start) + index : index + 1) + '. ';
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}
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return (
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prefix + content + (node.nextSibling && !/\n$/.test(content) ? '\n' : '')
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)
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}
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};
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rules.indentedCodeBlock = {
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filter: function (node, options) {
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return (
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options.codeBlockStyle === 'indented' &&
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node.nodeName === 'PRE' &&
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node.firstChild &&
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node.firstChild.nodeName === 'CODE'
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)
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},
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replacement: function (content, node, options) {
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return (
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'\n\n ' +
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node.firstChild.textContent.replace(/\n/g, '\n ') +
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'\n\n'
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)
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}
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};
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rules.fencedCodeBlock = {
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filter: function (node, options) {
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return (
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options.codeBlockStyle === 'fenced' &&
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node.nodeName === 'PRE' &&
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node.firstChild &&
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node.firstChild.nodeName === 'CODE'
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)
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},
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replacement: function (content, node, options) {
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var className = node.firstChild.getAttribute('class') || '';
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var language = (className.match(/language-(\S+)/) || [null, ''])[1];
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var code = node.firstChild.textContent;
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var fenceChar = options.fence.charAt(0);
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var fenceSize = 3;
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var fenceInCodeRegex = new RegExp('^' + fenceChar + '{3,}', 'gm');
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var match;
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while ((match = fenceInCodeRegex.exec(code))) {
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if (match[0].length >= fenceSize) {
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fenceSize = match[0].length + 1;
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}
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}
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var fence = repeat(fenceChar, fenceSize);
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return (
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'\n\n' + fence + language + '\n' +
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code.replace(/\n$/, '') +
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'\n' + fence + '\n\n'
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)
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}
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};
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rules.horizontalRule = {
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filter: 'hr',
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replacement: function (content, node, options) {
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return '\n\n' + options.hr + '\n\n'
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}
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};
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rules.inlineLink = {
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filter: function (node, options) {
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return (
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options.linkStyle === 'inlined' &&
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node.nodeName === 'A' &&
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node.getAttribute('href')
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)
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},
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replacement: function (content, node) {
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var href = node.getAttribute('href');
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if (href) href = href.replace(/([()])/g, '\\$1');
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var title = cleanAttribute(node.getAttribute('title'));
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if (title) title = ' "' + title.replace(/"/g, '\\"') + '"';
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return '[' + content + '](' + href + title + ')'
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}
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};
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rules.referenceLink = {
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filter: function (node, options) {
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return (
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options.linkStyle === 'referenced' &&
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node.nodeName === 'A' &&
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node.getAttribute('href')
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)
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},
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replacement: function (content, node, options) {
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var href = node.getAttribute('href');
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var title = cleanAttribute(node.getAttribute('title'));
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if (title) title = ' "' + title + '"';
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var replacement;
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var reference;
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switch (options.linkReferenceStyle) {
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case 'collapsed':
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replacement = '[' + content + '][]';
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reference = '[' + content + ']: ' + href + title;
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break
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case 'shortcut':
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replacement = '[' + content + ']';
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reference = '[' + content + ']: ' + href + title;
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break
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default:
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var id = this.references.length + 1;
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replacement = '[' + content + '][' + id + ']';
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reference = '[' + id + ']: ' + href + title;
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}
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this.references.push(reference);
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return replacement
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},
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references: [],
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append: function (options) {
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var references = '';
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if (this.references.length) {
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references = '\n\n' + this.references.join('\n') + '\n\n';
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this.references = []; // Reset references
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}
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return references
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}
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};
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rules.emphasis = {
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filter: ['em', 'i'],
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replacement: function (content, node, options) {
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if (!content.trim()) return ''
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return options.emDelimiter + content + options.emDelimiter
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}
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};
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rules.strong = {
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filter: ['strong', 'b'],
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replacement: function (content, node, options) {
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if (!content.trim()) return ''
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return options.strongDelimiter + content + options.strongDelimiter
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}
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};
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rules.code = {
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filter: function (node) {
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var hasSiblings = node.previousSibling || node.nextSibling;
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var isCodeBlock = node.parentNode.nodeName === 'PRE' && !hasSiblings;
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return node.nodeName === 'CODE' && !isCodeBlock
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},
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replacement: function (content) {
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if (!content) return ''
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content = content.replace(/\r?\n|\r/g, ' ');
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var extraSpace = /^`|^ .*?[^ ].* $|`$/.test(content) ? ' ' : '';
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var delimiter = '`';
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var matches = content.match(/`+/gm) || [];
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while (matches.indexOf(delimiter) !== -1) delimiter = delimiter + '`';
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return delimiter + extraSpace + content + extraSpace + delimiter
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}
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};
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rules.image = {
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filter: 'img',
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replacement: function (content, node) {
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var alt = cleanAttribute(node.getAttribute('alt'));
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var src = node.getAttribute('src') || '';
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var title = cleanAttribute(node.getAttribute('title'));
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var titlePart = title ? ' "' + title + '"' : '';
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return src ? '![' + alt + ']' + '(' + src + titlePart + ')' : ''
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}
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};
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function cleanAttribute (attribute) {
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return attribute ? attribute.replace(/(\n+\s*)+/g, '\n') : ''
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}
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/**
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* Manages a collection of rules used to convert HTML to Markdown
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*/
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function Rules (options) {
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this.options = options;
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this._keep = [];
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this._remove = [];
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this.blankRule = {
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replacement: options.blankReplacement
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};
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this.keepReplacement = options.keepReplacement;
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this.defaultRule = {
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replacement: options.defaultReplacement
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};
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this.array = [];
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for (var key in options.rules) this.array.push(options.rules[key]);
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}
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Rules.prototype = {
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add: function (key, rule) {
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this.array.unshift(rule);
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},
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keep: function (filter) {
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this._keep.unshift({
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filter: filter,
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replacement: this.keepReplacement
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});
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},
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remove: function (filter) {
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this._remove.unshift({
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filter: filter,
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replacement: function () {
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return ''
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}
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});
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},
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forNode: function (node) {
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if (node.isBlank) return this.blankRule
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var rule;
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if ((rule = findRule(this.array, node, this.options))) return rule
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if ((rule = findRule(this._keep, node, this.options))) return rule
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if ((rule = findRule(this._remove, node, this.options))) return rule
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return this.defaultRule
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},
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forEach: function (fn) {
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for (var i = 0; i < this.array.length; i++) fn(this.array[i], i);
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}
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};
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function findRule (rules, node, options) {
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for (var i = 0; i < rules.length; i++) {
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var rule = rules[i];
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if (filterValue(rule, node, options)) return rule
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}
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return void 0
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}
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function filterValue (rule, node, options) {
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var filter = rule.filter;
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if (typeof filter === 'string') {
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if (filter === node.nodeName.toLowerCase()) return true
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} else if (Array.isArray(filter)) {
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if (filter.indexOf(node.nodeName.toLowerCase()) > -1) return true
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} else if (typeof filter === 'function') {
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if (filter.call(rule, node, options)) return true
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} else {
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throw new TypeError('`filter` needs to be a string, array, or function')
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}
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}
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/**
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* The collapseWhitespace function is adapted from collapse-whitespace
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* by Luc Thevenard.
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2014 Luc Thevenard <lucthevenard@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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/**
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* collapseWhitespace(options) removes extraneous whitespace from an the given element.
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*
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* @param {Object} options
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*/
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function collapseWhitespace (options) {
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var element = options.element;
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var isBlock = options.isBlock;
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var isVoid = options.isVoid;
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var isPre = options.isPre || function (node) {
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return node.nodeName === 'PRE'
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};
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if (!element.firstChild || isPre(element)) return
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var prevText = null;
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var keepLeadingWs = false;
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var prev = null;
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var node = next(prev, element, isPre);
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while (node !== element) {
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if (node.nodeType === 3 || node.nodeType === 4) { // Node.TEXT_NODE or Node.CDATA_SECTION_NODE
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var text = node.data.replace(/[ \r\n\t]+/g, ' ');
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if ((!prevText || / $/.test(prevText.data)) &&
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!keepLeadingWs && text[0] === ' ') {
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text = text.substr(1);
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}
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// `text` might be empty at this point.
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if (!text) {
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node = remove(node);
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continue
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}
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node.data = text;
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prevText = node;
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} else if (node.nodeType === 1) { // Node.ELEMENT_NODE
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if (isBlock(node) || node.nodeName === 'BR') {
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if (prevText) {
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prevText.data = prevText.data.replace(/ $/, '');
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}
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prevText = null;
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keepLeadingWs = false;
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} else if (isVoid(node) || isPre(node)) {
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// Avoid trimming space around non-block, non-BR void elements and inline PRE.
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prevText = null;
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keepLeadingWs = true;
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} else if (prevText) {
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// Drop protection if set previously.
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keepLeadingWs = false;
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}
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} else {
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node = remove(node);
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continue
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}
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var nextNode = next(prev, node, isPre);
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prev = node;
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node = nextNode;
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}
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if (prevText) {
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prevText.data = prevText.data.replace(/ $/, '');
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if (!prevText.data) {
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remove(prevText);
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}
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}
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}
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/**
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* remove(node) removes the given node from the DOM and returns the
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* next node in the sequence.
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*
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* @param {Node} node
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* @return {Node} node
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*/
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function remove (node) {
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var next = node.nextSibling || node.parentNode;
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node.parentNode.removeChild(node);
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return next
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}
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/**
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* next(prev, current, isPre) returns the next node in the sequence, given the
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* current and previous nodes.
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*
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* @param {Node} prev
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* @param {Node} current
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* @param {Function} isPre
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* @return {Node}
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*/
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function next (prev, current, isPre) {
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if ((prev && prev.parentNode === current) || isPre(current)) {
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return current.nextSibling || current.parentNode
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}
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return current.firstChild || current.nextSibling || current.parentNode
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}
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/*
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* Set up window for Node.js
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*/
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var root = (typeof window !== 'undefined' ? window : {});
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/*
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* Parsing HTML strings
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*/
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function canParseHTMLNatively () {
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var Parser = root.DOMParser;
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var canParse = false;
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// Adapted from https://gist.github.com/1129031
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// Firefox/Opera/IE throw errors on unsupported types
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try {
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// WebKit returns null on unsupported types
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if (new Parser().parseFromString('', 'text/html')) {
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canParse = true;
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}
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} catch (e) {}
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return canParse
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}
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function createHTMLParser () {
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var Parser = function () {};
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{
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if (shouldUseActiveX()) {
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Parser.prototype.parseFromString = function (string) {
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var doc = new window.ActiveXObject('htmlfile');
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doc.designMode = 'on'; // disable on-page scripts
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doc.open();
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doc.write(string);
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doc.close();
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return doc
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};
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} else {
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Parser.prototype.parseFromString = function (string) {
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var doc = document.implementation.createHTMLDocument('');
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doc.open();
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doc.write(string);
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doc.close();
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return doc
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};
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}
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}
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return Parser
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}
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function shouldUseActiveX () {
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var useActiveX = false;
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try {
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document.implementation.createHTMLDocument('').open();
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} catch (e) {
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if (root.ActiveXObject) useActiveX = true;
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}
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return useActiveX
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}
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var HTMLParser = canParseHTMLNatively() ? root.DOMParser : createHTMLParser();
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function RootNode (input, options) {
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var root;
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if (typeof input === 'string') {
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var doc = htmlParser().parseFromString(
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// DOM parsers arrange elements in the <head> and <body>.
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// Wrapping in a custom element ensures elements are reliably arranged in
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// a single element.
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'<x-turndown id="turndown-root">' + input + '</x-turndown>',
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'text/html'
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);
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root = doc.getElementById('turndown-root');
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} else {
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root = input.cloneNode(true);
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}
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collapseWhitespace({
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element: root,
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isBlock: isBlock,
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isVoid: isVoid,
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isPre: options.preformattedCode ? isPreOrCode : null
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});
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return root
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}
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var _htmlParser;
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function htmlParser () {
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_htmlParser = _htmlParser || new HTMLParser();
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return _htmlParser
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}
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function isPreOrCode (node) {
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return node.nodeName === 'PRE' || node.nodeName === 'CODE'
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}
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function Node (node, options) {
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node.isBlock = isBlock(node);
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node.isCode = node.nodeName === 'CODE' || node.parentNode.isCode;
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node.isBlank = isBlank(node);
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node.flankingWhitespace = flankingWhitespace(node, options);
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return node
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}
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function isBlank (node) {
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return (
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!isVoid(node) &&
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!isMeaningfulWhenBlank(node) &&
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/^\s*$/i.test(node.textContent) &&
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!hasVoid(node) &&
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!hasMeaningfulWhenBlank(node)
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)
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}
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function flankingWhitespace (node, options) {
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if (node.isBlock || (options.preformattedCode && node.isCode)) {
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return { leading: '', trailing: '' }
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}
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var edges = edgeWhitespace(node.textContent);
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// abandon leading ASCII WS if left-flanked by ASCII WS
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if (edges.leadingAscii && isFlankedByWhitespace('left', node, options)) {
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edges.leading = edges.leadingNonAscii;
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}
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// abandon trailing ASCII WS if right-flanked by ASCII WS
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if (edges.trailingAscii && isFlankedByWhitespace('right', node, options)) {
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edges.trailing = edges.trailingNonAscii;
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}
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return { leading: edges.leading, trailing: edges.trailing }
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}
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function edgeWhitespace (string) {
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var m = string.match(/^(([ \t\r\n]*)(\s*))(?:(?=\S)[\s\S]*\S)?((\s*?)([ \t\r\n]*))$/);
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return {
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leading: m[1], // whole string for whitespace-only strings
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leadingAscii: m[2],
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leadingNonAscii: m[3],
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trailing: m[4], // empty for whitespace-only strings
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trailingNonAscii: m[5],
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trailingAscii: m[6]
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}
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}
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function isFlankedByWhitespace (side, node, options) {
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var sibling;
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var regExp;
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var isFlanked;
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if (side === 'left') {
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sibling = node.previousSibling;
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regExp = / $/;
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} else {
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sibling = node.nextSibling;
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regExp = /^ /;
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}
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if (sibling) {
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if (sibling.nodeType === 3) {
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isFlanked = regExp.test(sibling.nodeValue);
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} else if (options.preformattedCode && sibling.nodeName === 'CODE') {
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isFlanked = false;
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} else if (sibling.nodeType === 1 && !isBlock(sibling)) {
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isFlanked = regExp.test(sibling.textContent);
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}
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}
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return isFlanked
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}
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var reduce = Array.prototype.reduce;
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var escapes = [
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[/\\/g, '\\\\'],
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[/\*/g, '\\*'],
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[/^-/g, '\\-'],
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[/^\+ /g, '\\+ '],
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[/^(=+)/g, '\\$1'],
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[/^(#{1,6}) /g, '\\$1 '],
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[/`/g, '\\`'],
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[/^~~~/g, '\\~~~'],
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[/\[/g, '\\['],
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[/\]/g, '\\]'],
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[/^>/g, '\\>'],
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[/_/g, '\\_'],
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[/^(\d+)\. /g, '$1\\. ']
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];
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function TurndownService (options) {
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if (!(this instanceof TurndownService)) return new TurndownService(options)
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var defaults = {
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rules: rules,
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headingStyle: 'setext',
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hr: '* * *',
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bulletListMarker: '*',
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codeBlockStyle: 'indented',
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fence: '```',
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emDelimiter: '_',
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strongDelimiter: '**',
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linkStyle: 'inlined',
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linkReferenceStyle: 'full',
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br: ' ',
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preformattedCode: false,
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blankReplacement: function (content, node) {
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return node.isBlock ? '\n\n' : ''
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},
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keepReplacement: function (content, node) {
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return node.isBlock ? '\n\n' + node.outerHTML + '\n\n' : node.outerHTML
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},
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defaultReplacement: function (content, node) {
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return node.isBlock ? '\n\n' + content + '\n\n' : content
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}
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};
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this.options = extend({}, defaults, options);
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this.rules = new Rules(this.options);
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}
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TurndownService.prototype = {
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/**
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* The entry point for converting a string or DOM node to Markdown
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* @public
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* @param {String|HTMLElement} input The string or DOM node to convert
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* @returns A Markdown representation of the input
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* @type String
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*/
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turndown: function (input) {
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if (!canConvert(input)) {
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throw new TypeError(
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input + ' is not a string, or an element/document/fragment node.'
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)
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}
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if (input === '') return ''
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var output = process.call(this, new RootNode(input, this.options));
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return postProcess.call(this, output)
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},
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/**
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* Add one or more plugins
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* @public
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* @param {Function|Array} plugin The plugin or array of plugins to add
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* @returns The Turndown instance for chaining
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* @type Object
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*/
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use: function (plugin) {
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if (Array.isArray(plugin)) {
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for (var i = 0; i < plugin.length; i++) this.use(plugin[i]);
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} else if (typeof plugin === 'function') {
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plugin(this);
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} else {
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throw new TypeError('plugin must be a Function or an Array of Functions')
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}
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return this
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},
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/**
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* Adds a rule
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* @public
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* @param {String} key The unique key of the rule
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* @param {Object} rule The rule
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* @returns The Turndown instance for chaining
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* @type Object
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*/
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addRule: function (key, rule) {
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this.rules.add(key, rule);
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return this
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},
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/**
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* Keep a node (as HTML) that matches the filter
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* @public
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* @param {String|Array|Function} filter The unique key of the rule
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* @returns The Turndown instance for chaining
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* @type Object
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*/
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keep: function (filter) {
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this.rules.keep(filter);
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return this
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},
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/**
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* Remove a node that matches the filter
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* @public
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* @param {String|Array|Function} filter The unique key of the rule
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* @returns The Turndown instance for chaining
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* @type Object
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*/
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remove: function (filter) {
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this.rules.remove(filter);
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return this
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},
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/**
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* Escapes Markdown syntax
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* @public
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* @param {String} string The string to escape
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* @returns A string with Markdown syntax escaped
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* @type String
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*/
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escape: function (string) {
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return escapes.reduce(function (accumulator, escape) {
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return accumulator.replace(escape[0], escape[1])
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}, string)
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}
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};
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/**
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* Reduces a DOM node down to its Markdown string equivalent
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* @private
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* @param {HTMLElement} parentNode The node to convert
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* @returns A Markdown representation of the node
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* @type String
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*/
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function process (parentNode) {
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var self = this;
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return reduce.call(parentNode.childNodes, function (output, node) {
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node = new Node(node, self.options);
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var replacement = '';
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if (node.nodeType === 3) {
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replacement = node.isCode ? node.nodeValue : self.escape(node.nodeValue);
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} else if (node.nodeType === 1) {
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replacement = replacementForNode.call(self, node);
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}
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return join(output, replacement)
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}, '')
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}
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/**
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* Appends strings as each rule requires and trims the output
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* @private
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* @param {String} output The conversion output
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* @returns A trimmed version of the ouput
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* @type String
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*/
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function postProcess (output) {
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var self = this;
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this.rules.forEach(function (rule) {
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if (typeof rule.append === 'function') {
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output = join(output, rule.append(self.options));
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}
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});
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return output.replace(/^[\t\r\n]+/, '').replace(/[\t\r\n\s]+$/, '')
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}
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/**
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* Converts an element node to its Markdown equivalent
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* @private
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* @param {HTMLElement} node The node to convert
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* @returns A Markdown representation of the node
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* @type String
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*/
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function replacementForNode (node) {
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var rule = this.rules.forNode(node);
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var content = process.call(this, node);
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var whitespace = node.flankingWhitespace;
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if (whitespace.leading || whitespace.trailing) content = content.trim();
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return (
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whitespace.leading +
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rule.replacement(content, node, this.options) +
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whitespace.trailing
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)
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}
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/**
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* Joins replacement to the current output with appropriate number of new lines
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* @private
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* @param {String} output The current conversion output
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* @param {String} replacement The string to append to the output
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* @returns Joined output
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* @type String
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*/
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function join (output, replacement) {
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var s1 = trimTrailingNewlines(output);
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var s2 = trimLeadingNewlines(replacement);
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var nls = Math.max(output.length - s1.length, replacement.length - s2.length);
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var separator = '\n\n'.substring(0, nls);
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return s1 + separator + s2
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}
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/**
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* Determines whether an input can be converted
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* @private
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* @param {String|HTMLElement} input Describe this parameter
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* @returns Describe what it returns
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* @type String|Object|Array|Boolean|Number
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*/
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function canConvert (input) {
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return (
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input != null && (
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typeof input === 'string' ||
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(input.nodeType && (
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input.nodeType === 1 || input.nodeType === 9 || input.nodeType === 11
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))
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)
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)
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}
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return TurndownService;
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}()); |