debian-mirror-gitlab/app/assets/javascripts/behaviors/copy_as_gfm.js
2018-03-17 18:26:18 +05:30

500 lines
14 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 */
import _ from 'underscore';
import { insertText, getSelectedFragment, nodeMatchesSelector } from '../lib/utils/common_utils';
import { placeholderImage } from '../lazy_loader';
const gfmRules = {
// The filters referenced in lib/banzai/pipeline/gfm_pipeline.rb convert
// GitLab Flavored Markdown (GFM) to HTML.
// These handlers consequently convert that same HTML to GFM to be copied to the clipboard.
// Every filter in lib/banzai/pipeline/gfm_pipeline.rb that generates HTML
// from GFM should have a handler here, in reverse order.
// The GFM-to-HTML-to-GFM cycle is tested in spec/features/copy_as_gfm_spec.rb.
InlineDiffFilter: {
'span.idiff.addition'(el, text) {
return `{+${text}+}`;
},
'span.idiff.deletion'(el, text) {
return `{-${text}-}`;
},
},
TaskListFilter: {
'input[type=checkbox].task-list-item-checkbox'(el) {
return `[${el.checked ? 'x' : ' '}]`;
},
},
ReferenceFilter: {
'.tooltip'(el) {
return '';
},
'a.gfm:not([data-link=true])'(el, text) {
return el.dataset.original || text;
},
},
AutolinkFilter: {
'a'(el, text) {
// Fallback on the regular MarkdownFilter's `a` handler.
if (text !== el.getAttribute('href')) return false;
return text;
},
},
TableOfContentsFilter: {
'ul.section-nav'(el) {
return '[[_TOC_]]';
},
},
EmojiFilter: {
'img.emoji'(el) {
return el.getAttribute('alt');
},
'gl-emoji'(el) {
return `:${el.getAttribute('data-name')}:`;
},
},
ImageLinkFilter: {
'a.no-attachment-icon'(el, text) {
return text;
},
},
ImageLazyLoadFilter: {
'img'(el, text) {
return `![${el.getAttribute('alt')}](${el.getAttribute('src')})`;
},
},
VideoLinkFilter: {
'.video-container'(el) {
const videoEl = el.querySelector('video');
if (!videoEl) return false;
return CopyAsGFM.nodeToGFM(videoEl);
},
'video'(el) {
return `![${el.dataset.title}](${el.getAttribute('src')})`;
},
},
MermaidFilter: {
'svg.mermaid'(el, text) {
const sourceEl = el.querySelector('text.source');
if (!sourceEl) return false;
return `\`\`\`mermaid\n${CopyAsGFM.nodeToGFM(sourceEl)}\n\`\`\``;
},
'svg.mermaid style, svg.mermaid g'(el, text) {
// We don't want to include the content of these elements in the copied text.
return '';
},
},
MathFilter: {
'pre.code.math[data-math-style=display]'(el, text) {
return `\`\`\`math\n${text.trim()}\n\`\`\``;
},
'code.code.math[data-math-style=inline]'(el, text) {
return `$\`${text}\`$`;
},
'span.katex-display span.katex-mathml'(el) {
const mathAnnotation = el.querySelector('annotation[encoding="application/x-tex"]');
if (!mathAnnotation) return false;
return `\`\`\`math\n${CopyAsGFM.nodeToGFM(mathAnnotation)}\n\`\`\``;
},
'span.katex-mathml'(el) {
const mathAnnotation = el.querySelector('annotation[encoding="application/x-tex"]');
if (!mathAnnotation) return false;
return `$\`${CopyAsGFM.nodeToGFM(mathAnnotation)}\`$`;
},
'span.katex-html'(el) {
// We don't want to include the content of this element in the copied text.
return '';
},
'annotation[encoding="application/x-tex"]'(el, text) {
return text.trim();
},
},
SanitizationFilter: {
'a[name]:not([href]):empty'(el) {
return el.outerHTML;
},
'dl'(el, text) {
let lines = text.trim().split('\n');
// Add two spaces to the front of subsequent list items lines,
// or leave the line entirely blank.
lines = lines.map((l) => {
const line = l.trim();
if (line.length === 0) return '';
return ` ${line}`;
});
return `<dl>\n${lines.join('\n')}\n</dl>`;
},
'sub, dt, dd, kbd, q, samp, var, ruby, rt, rp, abbr, summary, details'(el, text) {
const tag = el.nodeName.toLowerCase();
return `<${tag}>${text}</${tag}>`;
},
},
SyntaxHighlightFilter: {
'pre.code.highlight'(el, t) {
const text = t.trimRight();
let lang = el.getAttribute('lang');
if (!lang || lang === 'plaintext') {
lang = '';
}
// Prefixes lines with 4 spaces if the code contains triple backticks
if (lang === '' && text.match(/^```/gm)) {
return text.split('\n').map((l) => {
const line = l.trim();
if (line.length === 0) return '';
return ` ${line}`;
}).join('\n');
}
return `\`\`\`${lang}\n${text}\n\`\`\``;
},
'pre > code'(el, text) {
// Don't wrap code blocks in ``
return text;
},
},
MarkdownFilter: {
'br'(el) {
// Two spaces at the end of a line are turned into a BR
return ' ';
},
'code'(el, text) {
let backtickCount = 1;
const backtickMatch = text.match(/`+/);
if (backtickMatch) {
backtickCount = backtickMatch[0].length + 1;
}
const backticks = Array(backtickCount + 1).join('`');
const spaceOrNoSpace = backtickCount > 1 ? ' ' : '';
return backticks + spaceOrNoSpace + text.trim() + spaceOrNoSpace + backticks;
},
'blockquote'(el, text) {
return text.trim().split('\n').map(s => `> ${s}`.trim()).join('\n');
},
'img'(el) {
const imageSrc = el.src;
const imageUrl = imageSrc && imageSrc !== placeholderImage ? imageSrc : (el.dataset.src || '');
return `![${el.getAttribute('alt')}](${imageUrl})`;
},
'a.anchor'(el, text) {
// Don't render a Markdown link for the anchor link inside a heading
return text;
},
'a'(el, text) {
return `[${text}](${el.getAttribute('href')})`;
},
'li'(el, text) {
const lines = text.trim().split('\n');
const firstLine = `- ${lines.shift()}`;
// Add four spaces to the front of subsequent list items lines,
// or leave the line entirely blank.
const nextLines = lines.map((s) => {
if (s.trim().length === 0) return '';
return ` ${s}`;
});
return `${firstLine}\n${nextLines.join('\n')}`;
},
'ul'(el, text) {
return text;
},
'ol'(el, text) {
// LIs get a `- ` prefix by default, which we replace by `1. ` for ordered lists.
return text.replace(/^- /mg, '1. ');
},
'h1'(el, text) {
return `# ${text.trim()}`;
},
'h2'(el, text) {
return `## ${text.trim()}`;
},
'h3'(el, text) {
return `### ${text.trim()}`;
},
'h4'(el, text) {
return `#### ${text.trim()}`;
},
'h5'(el, text) {
return `##### ${text.trim()}`;
},
'h6'(el, text) {
return `###### ${text.trim()}`;
},
'strong'(el, text) {
return `**${text}**`;
},
'em'(el, text) {
return `_${text}_`;
},
'del'(el, text) {
return `~~${text}~~`;
},
'sup'(el, text) {
return `^${text}`;
},
'hr'(el) {
return '-----';
},
'table'(el) {
const theadEl = el.querySelector('thead');
const tbodyEl = el.querySelector('tbody');
if (!theadEl || !tbodyEl) return false;
const theadText = CopyAsGFM.nodeToGFM(theadEl);
const tbodyText = CopyAsGFM.nodeToGFM(tbodyEl);
return [theadText, tbodyText].join('\n');
},
'thead'(el, text) {
const cells = _.map(el.querySelectorAll('th'), (cell) => {
let chars = CopyAsGFM.nodeToGFM(cell).length + 2;
let before = '';
let after = '';
switch (cell.style.textAlign) {
case 'center':
before = ':';
after = ':';
chars -= 2;
break;
case 'right':
after = ':';
chars -= 1;
break;
default:
break;
}
chars = Math.max(chars, 3);
const middle = Array(chars + 1).join('-');
return before + middle + after;
});
const separatorRow = `|${cells.join('|')}|`;
return [text, separatorRow].join('\n');
},
'tr'(el) {
const cellEls = el.querySelectorAll('td, th');
if (cellEls.length === 0) return false;
const cells = _.map(cellEls, cell => CopyAsGFM.nodeToGFM(cell));
return `| ${cells.join(' | ')} |`;
},
},
};
export class CopyAsGFM {
constructor() {
// iOS currently does not support clipboardData.setData(). This bug should
// be fixed in iOS 12, but for now we'll disable this for all iOS browsers
// ref: https://trac.webkit.org/changeset/222228/webkit
const userAgent = (typeof navigator !== 'undefined' && navigator.userAgent) || '';
const isIOS = /\b(iPad|iPhone|iPod)(?=;)/.test(userAgent);
if (isIOS) return;
$(document).on('copy', '.md, .wiki', (e) => { CopyAsGFM.copyAsGFM(e, CopyAsGFM.transformGFMSelection); });
$(document).on('copy', 'pre.code.highlight, .diff-content .line_content', (e) => { CopyAsGFM.copyAsGFM(e, CopyAsGFM.transformCodeSelection); });
$(document).on('paste', '.js-gfm-input', CopyAsGFM.pasteGFM);
}
static copyAsGFM(e, transformer) {
const clipboardData = e.originalEvent.clipboardData;
if (!clipboardData) return;
const documentFragment = getSelectedFragment();
if (!documentFragment) return;
const el = transformer(documentFragment.cloneNode(true), e.currentTarget);
if (!el) return;
e.preventDefault();
e.stopPropagation();
clipboardData.setData('text/plain', el.textContent);
clipboardData.setData('text/x-gfm', this.nodeToGFM(el));
}
static pasteGFM(e) {
const clipboardData = e.originalEvent.clipboardData;
if (!clipboardData) return;
const text = clipboardData.getData('text/plain');
const gfm = clipboardData.getData('text/x-gfm');
if (!gfm) return;
e.preventDefault();
window.gl.utils.insertText(e.target, (textBefore, textAfter) => {
// If the text before the cursor contains an odd number of backticks,
// we are either inside an inline code span that starts with 1 backtick
// or a code block that starts with 3 backticks.
// This logic still holds when there are one or more _closed_ code spans
// or blocks that will have 2 or 6 backticks.
// This will break down when the actual code block contains an uneven
// number of backticks, but this is a rare edge case.
const backtickMatch = textBefore.match(/`/g);
const insideCodeBlock = backtickMatch && (backtickMatch.length % 2) === 1;
if (insideCodeBlock) {
return text;
}
return gfm;
});
}
static transformGFMSelection(documentFragment) {
const gfmElements = documentFragment.querySelectorAll('.md, .wiki');
switch (gfmElements.length) {
case 0: {
return documentFragment;
}
case 1: {
return gfmElements[0];
}
default: {
const allGfmElement = document.createElement('div');
for (let i = 0; i < gfmElements.length; i += 1) {
const gfmElement = gfmElements[i];
allGfmElement.appendChild(gfmElement);
allGfmElement.appendChild(document.createTextNode('\n\n'));
}
return allGfmElement;
}
}
}
static transformCodeSelection(documentFragment, target) {
let lineSelector = '.line';
if (target) {
const lineClass = ['left-side', 'right-side'].filter(name => target.classList.contains(name))[0];
if (lineClass) {
lineSelector = `.line_content.${lineClass} ${lineSelector}`;
}
}
const lineElements = documentFragment.querySelectorAll(lineSelector);
let codeElement;
if (lineElements.length > 1) {
codeElement = document.createElement('pre');
codeElement.className = 'code highlight';
const lang = lineElements[0].getAttribute('lang');
if (lang) {
codeElement.setAttribute('lang', lang);
}
} else {
codeElement = document.createElement('code');
}
if (lineElements.length > 0) {
for (let i = 0; i < lineElements.length; i += 1) {
const lineElement = lineElements[i];
codeElement.appendChild(lineElement);
codeElement.appendChild(document.createTextNode('\n'));
}
} else {
codeElement.appendChild(documentFragment);
}
return codeElement;
}
static nodeToGFM(node, respectWhitespaceParam = false) {
if (node.nodeType === Node.COMMENT_NODE) {
return '';
}
if (node.nodeType === Node.TEXT_NODE) {
return node.textContent;
}
const respectWhitespace = respectWhitespaceParam || (node.nodeName === 'PRE' || node.nodeName === 'CODE');
const text = this.innerGFM(node, respectWhitespace);
if (node.nodeType === Node.DOCUMENT_FRAGMENT_NODE) {
return text;
}
for (const filter in gfmRules) {
const rules = gfmRules[filter];
for (const selector in rules) {
const func = rules[selector];
if (!nodeMatchesSelector(node, selector)) continue;
let result;
if (func.length === 2) {
// if `func` takes 2 arguments, it depends on text.
// if there is no text, we don't need to generate GFM for this node.
if (text.length === 0) continue;
result = func(node, text);
} else {
result = func(node);
}
if (result === false) continue;
return result;
}
}
return text;
}
static innerGFM(parentNode, respectWhitespace = false) {
const nodes = parentNode.childNodes;
const clonedParentNode = parentNode.cloneNode(true);
const clonedNodes = Array.prototype.slice.call(clonedParentNode.childNodes, 0);
for (let i = 0; i < nodes.length; i += 1) {
const node = nodes[i];
const clonedNode = clonedNodes[i];
const text = this.nodeToGFM(node, respectWhitespace);
// `clonedNode.replaceWith(text)` is not yet widely supported
clonedNode.parentNode.replaceChild(document.createTextNode(text), clonedNode);
}
let nodeText = clonedParentNode.innerText || clonedParentNode.textContent;
if (!respectWhitespace) {
nodeText = nodeText.trim();
}
return nodeText;
}
}
// Export CopyAsGFM as a global for rspec to access
// see /spec/features/copy_as_gfm_spec.rb
if (process.env.NODE_ENV !== 'production') {
window.CopyAsGFM = CopyAsGFM;
}
export default function initCopyAsGFM() {
return new CopyAsGFM();
}