466 lines
13 KiB
JavaScript
466 lines
13 KiB
JavaScript
/* eslint-disable class-methods-use-this, object-shorthand, no-unused-vars, no-use-before-define, no-new, max-len, no-restricted-syntax, guard-for-in, no-continue */
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import _ from 'underscore';
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import './lib/utils/common_utils';
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import { placeholderImage } from './lazy_loader';
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const gfmRules = {
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// The filters referenced in lib/banzai/pipeline/gfm_pipeline.rb convert
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// GitLab Flavored Markdown (GFM) to HTML.
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// These handlers consequently convert that same HTML to GFM to be copied to the clipboard.
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// Every filter in lib/banzai/pipeline/gfm_pipeline.rb that generates HTML
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// from GFM should have a handler here, in reverse order.
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// The GFM-to-HTML-to-GFM cycle is tested in spec/features/copy_as_gfm_spec.rb.
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InlineDiffFilter: {
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'span.idiff.addition'(el, text) {
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return `{+${text}+}`;
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},
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'span.idiff.deletion'(el, text) {
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return `{-${text}-}`;
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},
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},
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TaskListFilter: {
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'input[type=checkbox].task-list-item-checkbox'(el) {
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return `[${el.checked ? 'x' : ' '}]`;
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},
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},
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ReferenceFilter: {
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'.tooltip'(el) {
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return '';
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},
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'a.gfm:not([data-link=true])'(el, text) {
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return el.dataset.original || text;
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},
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},
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AutolinkFilter: {
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'a'(el, text) {
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// Fallback on the regular MarkdownFilter's `a` handler.
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if (text !== el.getAttribute('href')) return false;
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return text;
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},
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},
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TableOfContentsFilter: {
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'ul.section-nav'(el) {
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return '[[_TOC_]]';
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},
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},
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EmojiFilter: {
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'img.emoji'(el) {
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return el.getAttribute('alt');
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},
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'gl-emoji'(el) {
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return `:${el.getAttribute('data-name')}:`;
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},
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},
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ImageLinkFilter: {
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'a.no-attachment-icon'(el, text) {
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return text;
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},
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},
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ImageLazyLoadFilter: {
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'img'(el, text) {
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return `})`;
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},
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},
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VideoLinkFilter: {
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'.video-container'(el) {
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const videoEl = el.querySelector('video');
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if (!videoEl) return false;
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return CopyAsGFM.nodeToGFM(videoEl);
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},
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'video'(el) {
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return `})`;
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},
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},
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MathFilter: {
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'pre.code.math[data-math-style=display]'(el, text) {
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return `\`\`\`math\n${text.trim()}\n\`\`\``;
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},
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'code.code.math[data-math-style=inline]'(el, text) {
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return `$\`${text}\`$`;
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},
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'span.katex-display span.katex-mathml'(el) {
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const mathAnnotation = el.querySelector('annotation[encoding="application/x-tex"]');
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if (!mathAnnotation) return false;
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return `\`\`\`math\n${CopyAsGFM.nodeToGFM(mathAnnotation)}\n\`\`\``;
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},
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'span.katex-mathml'(el) {
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const mathAnnotation = el.querySelector('annotation[encoding="application/x-tex"]');
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if (!mathAnnotation) return false;
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return `$\`${CopyAsGFM.nodeToGFM(mathAnnotation)}\`$`;
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},
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'span.katex-html'(el) {
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// We don't want to include the content of this element in the copied text.
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return '';
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},
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'annotation[encoding="application/x-tex"]'(el, text) {
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return text.trim();
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},
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},
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SanitizationFilter: {
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'a[name]:not([href]):empty'(el) {
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return el.outerHTML;
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},
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'dl'(el, text) {
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let lines = text.trim().split('\n');
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// Add two spaces to the front of subsequent list items lines,
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// or leave the line entirely blank.
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lines = lines.map((l) => {
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const line = l.trim();
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if (line.length === 0) return '';
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return ` ${line}`;
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});
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return `<dl>\n${lines.join('\n')}\n</dl>`;
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},
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'sub, dt, dd, kbd, q, samp, var, ruby, rt, rp, abbr, summary, details'(el, text) {
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const tag = el.nodeName.toLowerCase();
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return `<${tag}>${text}</${tag}>`;
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},
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},
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SyntaxHighlightFilter: {
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'pre.code.highlight'(el, t) {
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const text = t.trimRight();
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let lang = el.getAttribute('lang');
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if (!lang || lang === 'plaintext') {
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lang = '';
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}
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// Prefixes lines with 4 spaces if the code contains triple backticks
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if (lang === '' && text.match(/^```/gm)) {
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return text.split('\n').map((l) => {
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const line = l.trim();
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if (line.length === 0) return '';
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return ` ${line}`;
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}).join('\n');
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}
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return `\`\`\`${lang}\n${text}\n\`\`\``;
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},
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'pre > code'(el, text) {
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// Don't wrap code blocks in ``
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return text;
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},
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},
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MarkdownFilter: {
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'br'(el) {
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// Two spaces at the end of a line are turned into a BR
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return ' ';
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},
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'code'(el, text) {
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let backtickCount = 1;
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const backtickMatch = text.match(/`+/);
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if (backtickMatch) {
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backtickCount = backtickMatch[0].length + 1;
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}
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const backticks = Array(backtickCount + 1).join('`');
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const spaceOrNoSpace = backtickCount > 1 ? ' ' : '';
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return backticks + spaceOrNoSpace + text.trim() + spaceOrNoSpace + backticks;
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},
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'blockquote'(el, text) {
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return text.trim().split('\n').map(s => `> ${s}`.trim()).join('\n');
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},
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'img'(el) {
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const imageSrc = el.src;
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const imageUrl = imageSrc && imageSrc !== placeholderImage ? imageSrc : (el.dataset.src || '');
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return ``;
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},
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'a.anchor'(el, text) {
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// Don't render a Markdown link for the anchor link inside a heading
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return text;
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},
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'a'(el, text) {
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return `[${text}](${el.getAttribute('href')})`;
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},
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'li'(el, text) {
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const lines = text.trim().split('\n');
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const firstLine = `- ${lines.shift()}`;
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// Add four spaces to the front of subsequent list items lines,
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// or leave the line entirely blank.
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const nextLines = lines.map((s) => {
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if (s.trim().length === 0) return '';
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return ` ${s}`;
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});
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return `${firstLine}\n${nextLines.join('\n')}`;
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},
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'ul'(el, text) {
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return text;
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},
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'ol'(el, text) {
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// LIs get a `- ` prefix by default, which we replace by `1. ` for ordered lists.
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return text.replace(/^- /mg, '1. ');
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},
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'h1'(el, text) {
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return `# ${text.trim()}`;
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},
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'h2'(el, text) {
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return `## ${text.trim()}`;
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},
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'h3'(el, text) {
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return `### ${text.trim()}`;
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},
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'h4'(el, text) {
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return `#### ${text.trim()}`;
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},
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'h5'(el, text) {
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return `##### ${text.trim()}`;
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},
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'h6'(el, text) {
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return `###### ${text.trim()}`;
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},
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'strong'(el, text) {
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return `**${text}**`;
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},
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'em'(el, text) {
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return `_${text}_`;
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},
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'del'(el, text) {
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return `~~${text}~~`;
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},
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'sup'(el, text) {
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return `^${text}`;
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},
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'hr'(el) {
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return '-----';
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},
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'table'(el) {
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const theadEl = el.querySelector('thead');
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const tbodyEl = el.querySelector('tbody');
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if (!theadEl || !tbodyEl) return false;
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const theadText = CopyAsGFM.nodeToGFM(theadEl);
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const tbodyText = CopyAsGFM.nodeToGFM(tbodyEl);
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return [theadText, tbodyText].join('\n');
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},
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'thead'(el, text) {
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const cells = _.map(el.querySelectorAll('th'), (cell) => {
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let chars = CopyAsGFM.nodeToGFM(cell).length + 2;
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let before = '';
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let after = '';
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switch (cell.style.textAlign) {
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case 'center':
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before = ':';
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after = ':';
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chars -= 2;
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break;
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case 'right':
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after = ':';
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chars -= 1;
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break;
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default:
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break;
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}
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chars = Math.max(chars, 3);
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const middle = Array(chars + 1).join('-');
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return before + middle + after;
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});
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const separatorRow = `|${cells.join('|')}|`;
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return [text, separatorRow].join('\n');
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},
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'tr'(el) {
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const cellEls = el.querySelectorAll('td, th');
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if (cellEls.length === 0) return false;
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const cells = _.map(cellEls, cell => CopyAsGFM.nodeToGFM(cell));
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return `| ${cells.join(' | ')} |`;
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},
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},
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};
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class CopyAsGFM {
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constructor() {
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$(document).on('copy', '.md, .wiki', (e) => { CopyAsGFM.copyAsGFM(e, CopyAsGFM.transformGFMSelection); });
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$(document).on('copy', 'pre.code.highlight, .diff-content .line_content', (e) => { CopyAsGFM.copyAsGFM(e, CopyAsGFM.transformCodeSelection); });
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$(document).on('paste', '.js-gfm-input', CopyAsGFM.pasteGFM);
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}
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static copyAsGFM(e, transformer) {
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const clipboardData = e.originalEvent.clipboardData;
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if (!clipboardData) return;
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const documentFragment = window.gl.utils.getSelectedFragment();
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if (!documentFragment) return;
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const el = transformer(documentFragment.cloneNode(true));
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if (!el) return;
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e.preventDefault();
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e.stopPropagation();
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clipboardData.setData('text/plain', el.textContent);
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clipboardData.setData('text/x-gfm', this.nodeToGFM(el));
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}
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static pasteGFM(e) {
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const clipboardData = e.originalEvent.clipboardData;
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if (!clipboardData) return;
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const text = clipboardData.getData('text/plain');
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const gfm = clipboardData.getData('text/x-gfm');
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if (!gfm) return;
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e.preventDefault();
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window.gl.utils.insertText(e.target, (textBefore, textAfter) => {
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// If the text before the cursor contains an odd number of backticks,
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// we are either inside an inline code span that starts with 1 backtick
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// or a code block that starts with 3 backticks.
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// This logic still holds when there are one or more _closed_ code spans
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// or blocks that will have 2 or 6 backticks.
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// This will break down when the actual code block contains an uneven
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// number of backticks, but this is a rare edge case.
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const backtickMatch = textBefore.match(/`/g);
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const insideCodeBlock = backtickMatch && (backtickMatch.length % 2) === 1;
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if (insideCodeBlock) {
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return text;
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}
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return gfm;
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});
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}
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static transformGFMSelection(documentFragment) {
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const gfmEls = documentFragment.querySelectorAll('.md, .wiki');
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switch (gfmEls.length) {
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case 0: {
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return documentFragment;
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}
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case 1: {
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return gfmEls[0];
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}
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default: {
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const allGfmEl = document.createElement('div');
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for (let i = 0; i < gfmEls.length; i += 1) {
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const lineEl = gfmEls[i];
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allGfmEl.appendChild(lineEl);
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allGfmEl.appendChild(document.createTextNode('\n\n'));
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}
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return allGfmEl;
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}
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}
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}
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static transformCodeSelection(documentFragment) {
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const lineEls = documentFragment.querySelectorAll('.line');
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let codeEl;
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if (lineEls.length > 1) {
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codeEl = document.createElement('pre');
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codeEl.className = 'code highlight';
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const lang = lineEls[0].getAttribute('lang');
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if (lang) {
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codeEl.setAttribute('lang', lang);
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}
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} else {
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codeEl = document.createElement('code');
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}
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if (lineEls.length > 0) {
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for (let i = 0; i < lineEls.length; i += 1) {
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const lineEl = lineEls[i];
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codeEl.appendChild(lineEl);
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codeEl.appendChild(document.createTextNode('\n'));
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}
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} else {
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codeEl.appendChild(documentFragment);
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}
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return codeEl;
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}
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static nodeToGFM(node, respectWhitespaceParam = false) {
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if (node.nodeType === Node.COMMENT_NODE) {
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return '';
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}
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if (node.nodeType === Node.TEXT_NODE) {
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return node.textContent;
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}
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const respectWhitespace = respectWhitespaceParam || (node.nodeName === 'PRE' || node.nodeName === 'CODE');
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const text = this.innerGFM(node, respectWhitespace);
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if (node.nodeType === Node.DOCUMENT_FRAGMENT_NODE) {
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return text;
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}
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for (const filter in gfmRules) {
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const rules = gfmRules[filter];
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for (const selector in rules) {
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const func = rules[selector];
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if (!window.gl.utils.nodeMatchesSelector(node, selector)) continue;
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let result;
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if (func.length === 2) {
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// if `func` takes 2 arguments, it depends on text.
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// if there is no text, we don't need to generate GFM for this node.
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if (text.length === 0) continue;
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result = func(node, text);
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} else {
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result = func(node);
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}
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if (result === false) continue;
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return result;
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}
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}
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return text;
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}
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static innerGFM(parentNode, respectWhitespace = false) {
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const nodes = parentNode.childNodes;
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const clonedParentNode = parentNode.cloneNode(true);
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const clonedNodes = Array.prototype.slice.call(clonedParentNode.childNodes, 0);
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for (let i = 0; i < nodes.length; i += 1) {
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const node = nodes[i];
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const clonedNode = clonedNodes[i];
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const text = this.nodeToGFM(node, respectWhitespace);
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// `clonedNode.replaceWith(text)` is not yet widely supported
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clonedNode.parentNode.replaceChild(document.createTextNode(text), clonedNode);
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}
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let nodeText = clonedParentNode.innerText || clonedParentNode.textContent;
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if (!respectWhitespace) {
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nodeText = nodeText.trim();
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}
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return nodeText;
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}
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}
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window.gl = window.gl || {};
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window.gl.CopyAsGFM = CopyAsGFM;
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new CopyAsGFM();
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