777 lines
21 KiB
JavaScript
777 lines
21 KiB
JavaScript
import { defaults } from './defaults.js';
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import {
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rtrim,
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splitCells,
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escape,
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findClosingBracket
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} from './helpers.js';
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function outputLink(cap, link, raw, lexer) {
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const href = link.href;
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const title = link.title ? escape(link.title) : null;
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const text = cap[1].replace(/\\([\[\]])/g, '$1');
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if (cap[0].charAt(0) !== '!') {
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lexer.state.inLink = true;
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const token = {
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type: 'link',
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raw,
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href,
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title,
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text,
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tokens: lexer.inlineTokens(text)
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};
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lexer.state.inLink = false;
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return token;
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}
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return {
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type: 'image',
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raw,
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href,
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title,
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text: escape(text)
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};
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}
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function indentCodeCompensation(raw, text) {
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const matchIndentToCode = raw.match(/^(\s+)(?:```)/);
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if (matchIndentToCode === null) {
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return text;
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}
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const indentToCode = matchIndentToCode[1];
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return text
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.split('\n')
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.map(node => {
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const matchIndentInNode = node.match(/^\s+/);
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if (matchIndentInNode === null) {
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return node;
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}
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const [indentInNode] = matchIndentInNode;
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if (indentInNode.length >= indentToCode.length) {
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return node.slice(indentToCode.length);
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}
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return node;
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})
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.join('\n');
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}
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/**
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* Tokenizer
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*/
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export class Tokenizer {
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constructor(options) {
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this.options = options || defaults;
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}
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space(src) {
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const cap = this.rules.block.newline.exec(src);
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if (cap && cap[0].length > 0) {
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return {
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type: 'space',
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raw: cap[0]
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};
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}
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}
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code(src) {
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const cap = this.rules.block.code.exec(src);
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if (cap) {
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const text = cap[0].replace(/^ {1,4}/gm, '');
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return {
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type: 'code',
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raw: cap[0],
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codeBlockStyle: 'indented',
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text: !this.options.pedantic
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? rtrim(text, '\n')
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: text
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};
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}
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}
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fences(src) {
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const cap = this.rules.block.fences.exec(src);
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if (cap) {
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const raw = cap[0];
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const text = indentCodeCompensation(raw, cap[3] || '');
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return {
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type: 'code',
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raw,
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lang: cap[2] ? cap[2].trim() : cap[2],
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text
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};
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}
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}
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heading(src) {
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const cap = this.rules.block.heading.exec(src);
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if (cap) {
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let text = cap[2].trim();
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// remove trailing #s
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if (/#$/.test(text)) {
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const trimmed = rtrim(text, '#');
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if (this.options.pedantic) {
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text = trimmed.trim();
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} else if (!trimmed || / $/.test(trimmed)) {
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// CommonMark requires space before trailing #s
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text = trimmed.trim();
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}
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}
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return {
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type: 'heading',
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raw: cap[0],
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depth: cap[1].length,
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text,
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tokens: this.lexer.inline(text)
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};
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}
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}
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hr(src) {
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const cap = this.rules.block.hr.exec(src);
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if (cap) {
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return {
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type: 'hr',
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raw: cap[0]
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};
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}
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}
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blockquote(src) {
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const cap = this.rules.block.blockquote.exec(src);
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if (cap) {
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const text = cap[0].replace(/^ *>[ \t]?/gm, '');
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return {
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type: 'blockquote',
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raw: cap[0],
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tokens: this.lexer.blockTokens(text, []),
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text
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};
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}
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}
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list(src) {
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let cap = this.rules.block.list.exec(src);
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if (cap) {
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let raw, istask, ischecked, indent, i, blankLine, endsWithBlankLine,
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line, nextLine, rawLine, itemContents, endEarly;
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let bull = cap[1].trim();
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const isordered = bull.length > 1;
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const list = {
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type: 'list',
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raw: '',
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ordered: isordered,
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start: isordered ? +bull.slice(0, -1) : '',
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loose: false,
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items: []
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};
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bull = isordered ? `\\d{1,9}\\${bull.slice(-1)}` : `\\${bull}`;
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if (this.options.pedantic) {
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bull = isordered ? bull : '[*+-]';
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}
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// Get next list item
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const itemRegex = new RegExp(`^( {0,3}${bull})((?:[\t ][^\\n]*)?(?:\\n|$))`);
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// Check if current bullet point can start a new List Item
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while (src) {
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endEarly = false;
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if (!(cap = itemRegex.exec(src))) {
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break;
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}
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if (this.rules.block.hr.test(src)) { // End list if bullet was actually HR (possibly move into itemRegex?)
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break;
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}
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raw = cap[0];
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src = src.substring(raw.length);
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line = cap[2].split('\n', 1)[0];
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nextLine = src.split('\n', 1)[0];
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if (this.options.pedantic) {
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indent = 2;
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itemContents = line.trimLeft();
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} else {
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indent = cap[2].search(/[^ ]/); // Find first non-space char
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indent = indent > 4 ? 1 : indent; // Treat indented code blocks (> 4 spaces) as having only 1 indent
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itemContents = line.slice(indent);
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indent += cap[1].length;
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}
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blankLine = false;
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if (!line && /^ *$/.test(nextLine)) { // Items begin with at most one blank line
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raw += nextLine + '\n';
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src = src.substring(nextLine.length + 1);
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endEarly = true;
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}
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if (!endEarly) {
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const nextBulletRegex = new RegExp(`^ {0,${Math.min(3, indent - 1)}}(?:[*+-]|\\d{1,9}[.)])((?: [^\\n]*)?(?:\\n|$))`);
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const hrRegex = new RegExp(`^ {0,${Math.min(3, indent - 1)}}((?:- *){3,}|(?:_ *){3,}|(?:\\* *){3,})(?:\\n+|$)`);
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const fencesBeginRegex = new RegExp(`^ {0,${Math.min(3, indent - 1)}}(?:\`\`\`|~~~)`);
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const headingBeginRegex = new RegExp(`^ {0,${Math.min(3, indent - 1)}}#`);
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// Check if following lines should be included in List Item
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while (src) {
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rawLine = src.split('\n', 1)[0];
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line = rawLine;
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// Re-align to follow commonmark nesting rules
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if (this.options.pedantic) {
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line = line.replace(/^ {1,4}(?=( {4})*[^ ])/g, ' ');
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}
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// End list item if found code fences
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if (fencesBeginRegex.test(line)) {
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break;
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}
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// End list item if found start of new heading
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if (headingBeginRegex.test(line)) {
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break;
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}
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// End list item if found start of new bullet
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if (nextBulletRegex.test(line)) {
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break;
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}
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// Horizontal rule found
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if (hrRegex.test(src)) {
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break;
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}
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if (line.search(/[^ ]/) >= indent || !line.trim()) { // Dedent if possible
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itemContents += '\n' + line.slice(indent);
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} else if (!blankLine) { // Until blank line, item doesn't need indentation
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itemContents += '\n' + line;
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} else { // Otherwise, improper indentation ends this item
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break;
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}
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if (!blankLine && !line.trim()) { // Check if current line is blank
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blankLine = true;
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}
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raw += rawLine + '\n';
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src = src.substring(rawLine.length + 1);
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}
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}
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if (!list.loose) {
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// If the previous item ended with a blank line, the list is loose
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if (endsWithBlankLine) {
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list.loose = true;
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} else if (/\n *\n *$/.test(raw)) {
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endsWithBlankLine = true;
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}
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}
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// Check for task list items
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if (this.options.gfm) {
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istask = /^\[[ xX]\] /.exec(itemContents);
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if (istask) {
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ischecked = istask[0] !== '[ ] ';
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itemContents = itemContents.replace(/^\[[ xX]\] +/, '');
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}
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}
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list.items.push({
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type: 'list_item',
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raw,
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task: !!istask,
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checked: ischecked,
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loose: false,
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text: itemContents
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});
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list.raw += raw;
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}
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// Do not consume newlines at end of final item. Alternatively, make itemRegex *start* with any newlines to simplify/speed up endsWithBlankLine logic
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list.items[list.items.length - 1].raw = raw.trimRight();
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list.items[list.items.length - 1].text = itemContents.trimRight();
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list.raw = list.raw.trimRight();
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const l = list.items.length;
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// Item child tokens handled here at end because we needed to have the final item to trim it first
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for (i = 0; i < l; i++) {
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this.lexer.state.top = false;
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list.items[i].tokens = this.lexer.blockTokens(list.items[i].text, []);
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const spacers = list.items[i].tokens.filter(t => t.type === 'space');
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const hasMultipleLineBreaks = spacers.every(t => {
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const chars = t.raw.split('');
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let lineBreaks = 0;
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for (const char of chars) {
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if (char === '\n') {
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lineBreaks += 1;
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}
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if (lineBreaks > 1) {
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return true;
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}
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}
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return false;
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});
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if (!list.loose && spacers.length && hasMultipleLineBreaks) {
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// Having a single line break doesn't mean a list is loose. A single line break is terminating the last list item
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list.loose = true;
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list.items[i].loose = true;
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}
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}
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return list;
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}
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}
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html(src) {
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const cap = this.rules.block.html.exec(src);
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if (cap) {
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const token = {
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type: 'html',
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raw: cap[0],
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pre: !this.options.sanitizer
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&& (cap[1] === 'pre' || cap[1] === 'script' || cap[1] === 'style'),
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text: cap[0]
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};
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if (this.options.sanitize) {
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const text = this.options.sanitizer ? this.options.sanitizer(cap[0]) : escape(cap[0]);
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token.type = 'paragraph';
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token.text = text;
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token.tokens = this.lexer.inline(text);
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}
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return token;
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}
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}
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def(src) {
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const cap = this.rules.block.def.exec(src);
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if (cap) {
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if (cap[3]) cap[3] = cap[3].substring(1, cap[3].length - 1);
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const tag = cap[1].toLowerCase().replace(/\s+/g, ' ');
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return {
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type: 'def',
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tag,
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raw: cap[0],
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href: cap[2],
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title: cap[3]
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};
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}
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}
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table(src) {
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const cap = this.rules.block.table.exec(src);
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if (cap) {
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const item = {
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type: 'table',
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header: splitCells(cap[1]).map(c => { return { text: c }; }),
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align: cap[2].replace(/^ *|\| *$/g, '').split(/ *\| */),
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rows: cap[3] && cap[3].trim() ? cap[3].replace(/\n[ \t]*$/, '').split('\n') : []
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};
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if (item.header.length === item.align.length) {
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item.raw = cap[0];
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let l = item.align.length;
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let i, j, k, row;
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for (i = 0; i < l; i++) {
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if (/^ *-+: *$/.test(item.align[i])) {
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item.align[i] = 'right';
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} else if (/^ *:-+: *$/.test(item.align[i])) {
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item.align[i] = 'center';
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} else if (/^ *:-+ *$/.test(item.align[i])) {
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item.align[i] = 'left';
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} else {
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item.align[i] = null;
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}
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}
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l = item.rows.length;
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for (i = 0; i < l; i++) {
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item.rows[i] = splitCells(item.rows[i], item.header.length).map(c => { return { text: c }; });
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}
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// parse child tokens inside headers and cells
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// header child tokens
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l = item.header.length;
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for (j = 0; j < l; j++) {
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item.header[j].tokens = this.lexer.inline(item.header[j].text);
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}
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// cell child tokens
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l = item.rows.length;
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for (j = 0; j < l; j++) {
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row = item.rows[j];
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for (k = 0; k < row.length; k++) {
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row[k].tokens = this.lexer.inline(row[k].text);
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}
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}
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return item;
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}
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}
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}
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lheading(src) {
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const cap = this.rules.block.lheading.exec(src);
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if (cap) {
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return {
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type: 'heading',
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raw: cap[0],
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depth: cap[2].charAt(0) === '=' ? 1 : 2,
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text: cap[1],
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tokens: this.lexer.inline(cap[1])
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};
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}
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}
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paragraph(src) {
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const cap = this.rules.block.paragraph.exec(src);
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if (cap) {
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const text = cap[1].charAt(cap[1].length - 1) === '\n'
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? cap[1].slice(0, -1)
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: cap[1];
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return {
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type: 'paragraph',
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raw: cap[0],
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text,
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tokens: this.lexer.inline(text)
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};
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}
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}
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text(src) {
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const cap = this.rules.block.text.exec(src);
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if (cap) {
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return {
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type: 'text',
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raw: cap[0],
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text: cap[0],
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tokens: this.lexer.inline(cap[0])
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};
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}
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}
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escape(src) {
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const cap = this.rules.inline.escape.exec(src);
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if (cap) {
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return {
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type: 'escape',
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raw: cap[0],
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text: escape(cap[1])
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};
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}
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}
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tag(src) {
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const cap = this.rules.inline.tag.exec(src);
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if (cap) {
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if (!this.lexer.state.inLink && /^<a /i.test(cap[0])) {
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this.lexer.state.inLink = true;
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} else if (this.lexer.state.inLink && /^<\/a>/i.test(cap[0])) {
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this.lexer.state.inLink = false;
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}
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if (!this.lexer.state.inRawBlock && /^<(pre|code|kbd|script)(\s|>)/i.test(cap[0])) {
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this.lexer.state.inRawBlock = true;
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} else if (this.lexer.state.inRawBlock && /^<\/(pre|code|kbd|script)(\s|>)/i.test(cap[0])) {
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this.lexer.state.inRawBlock = false;
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}
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return {
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type: this.options.sanitize
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? 'text'
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: 'html',
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raw: cap[0],
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inLink: this.lexer.state.inLink,
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inRawBlock: this.lexer.state.inRawBlock,
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text: this.options.sanitize
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? (this.options.sanitizer
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? this.options.sanitizer(cap[0])
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: escape(cap[0]))
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: cap[0]
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};
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}
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}
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link(src) {
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const cap = this.rules.inline.link.exec(src);
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if (cap) {
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const trimmedUrl = cap[2].trim();
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if (!this.options.pedantic && /^</.test(trimmedUrl)) {
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// commonmark requires matching angle brackets
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if (!(/>$/.test(trimmedUrl))) {
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return;
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}
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// ending angle bracket cannot be escaped
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const rtrimSlash = rtrim(trimmedUrl.slice(0, -1), '\\');
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if ((trimmedUrl.length - rtrimSlash.length) % 2 === 0) {
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return;
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}
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} else {
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// find closing parenthesis
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const lastParenIndex = findClosingBracket(cap[2], '()');
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if (lastParenIndex > -1) {
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const start = cap[0].indexOf('!') === 0 ? 5 : 4;
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const linkLen = start + cap[1].length + lastParenIndex;
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cap[2] = cap[2].substring(0, lastParenIndex);
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cap[0] = cap[0].substring(0, linkLen).trim();
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cap[3] = '';
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}
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}
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let href = cap[2];
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let title = '';
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if (this.options.pedantic) {
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// split pedantic href and title
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const link = /^([^'"]*[^\s])\s+(['"])(.*)\2/.exec(href);
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if (link) {
|
|
href = link[1];
|
|
title = link[3];
|
|
}
|
|
} else {
|
|
title = cap[3] ? cap[3].slice(1, -1) : '';
|
|
}
|
|
|
|
href = href.trim();
|
|
if (/^</.test(href)) {
|
|
if (this.options.pedantic && !(/>$/.test(trimmedUrl))) {
|
|
// pedantic allows starting angle bracket without ending angle bracket
|
|
href = href.slice(1);
|
|
} else {
|
|
href = href.slice(1, -1);
|
|
}
|
|
}
|
|
return outputLink(cap, {
|
|
href: href ? href.replace(this.rules.inline._escapes, '$1') : href,
|
|
title: title ? title.replace(this.rules.inline._escapes, '$1') : title
|
|
}, cap[0], this.lexer);
|
|
}
|
|
}
|
|
|
|
reflink(src, links) {
|
|
let cap;
|
|
if ((cap = this.rules.inline.reflink.exec(src))
|
|
|| (cap = this.rules.inline.nolink.exec(src))) {
|
|
let link = (cap[2] || cap[1]).replace(/\s+/g, ' ');
|
|
link = links[link.toLowerCase()];
|
|
if (!link || !link.href) {
|
|
const text = cap[0].charAt(0);
|
|
return {
|
|
type: 'text',
|
|
raw: text,
|
|
text
|
|
};
|
|
}
|
|
return outputLink(cap, link, cap[0], this.lexer);
|
|
}
|
|
}
|
|
|
|
emStrong(src, maskedSrc, prevChar = '') {
|
|
let match = this.rules.inline.emStrong.lDelim.exec(src);
|
|
if (!match) return;
|
|
|
|
// _ can't be between two alphanumerics. \p{L}\p{N} includes non-english alphabet/numbers as well
|
|
if (match[3] && prevChar.match(/[\p{L}\p{N}]/u)) return;
|
|
|
|
const nextChar = match[1] || match[2] || '';
|
|
|
|
if (!nextChar || (nextChar && (prevChar === '' || this.rules.inline.punctuation.exec(prevChar)))) {
|
|
const lLength = match[0].length - 1;
|
|
let rDelim, rLength, delimTotal = lLength, midDelimTotal = 0;
|
|
|
|
const endReg = match[0][0] === '*' ? this.rules.inline.emStrong.rDelimAst : this.rules.inline.emStrong.rDelimUnd;
|
|
endReg.lastIndex = 0;
|
|
|
|
// Clip maskedSrc to same section of string as src (move to lexer?)
|
|
maskedSrc = maskedSrc.slice(-1 * src.length + lLength);
|
|
|
|
while ((match = endReg.exec(maskedSrc)) != null) {
|
|
rDelim = match[1] || match[2] || match[3] || match[4] || match[5] || match[6];
|
|
|
|
if (!rDelim) continue; // skip single * in __abc*abc__
|
|
|
|
rLength = rDelim.length;
|
|
|
|
if (match[3] || match[4]) { // found another Left Delim
|
|
delimTotal += rLength;
|
|
continue;
|
|
} else if (match[5] || match[6]) { // either Left or Right Delim
|
|
if (lLength % 3 && !((lLength + rLength) % 3)) {
|
|
midDelimTotal += rLength;
|
|
continue; // CommonMark Emphasis Rules 9-10
|
|
}
|
|
}
|
|
|
|
delimTotal -= rLength;
|
|
|
|
if (delimTotal > 0) continue; // Haven't found enough closing delimiters
|
|
|
|
// Remove extra characters. *a*** -> *a*
|
|
rLength = Math.min(rLength, rLength + delimTotal + midDelimTotal);
|
|
|
|
// Create `em` if smallest delimiter has odd char count. *a***
|
|
if (Math.min(lLength, rLength) % 2) {
|
|
const text = src.slice(1, lLength + match.index + rLength);
|
|
return {
|
|
type: 'em',
|
|
raw: src.slice(0, lLength + match.index + rLength + 1),
|
|
text,
|
|
tokens: this.lexer.inlineTokens(text)
|
|
};
|
|
}
|
|
|
|
// Create 'strong' if smallest delimiter has even char count. **a***
|
|
const text = src.slice(2, lLength + match.index + rLength - 1);
|
|
return {
|
|
type: 'strong',
|
|
raw: src.slice(0, lLength + match.index + rLength + 1),
|
|
text,
|
|
tokens: this.lexer.inlineTokens(text)
|
|
};
|
|
}
|
|
}
|
|
}
|
|
|
|
codespan(src) {
|
|
const cap = this.rules.inline.code.exec(src);
|
|
if (cap) {
|
|
let text = cap[2].replace(/\n/g, ' ');
|
|
const hasNonSpaceChars = /[^ ]/.test(text);
|
|
const hasSpaceCharsOnBothEnds = /^ /.test(text) && / $/.test(text);
|
|
if (hasNonSpaceChars && hasSpaceCharsOnBothEnds) {
|
|
text = text.substring(1, text.length - 1);
|
|
}
|
|
text = escape(text, true);
|
|
return {
|
|
type: 'codespan',
|
|
raw: cap[0],
|
|
text
|
|
};
|
|
}
|
|
}
|
|
|
|
br(src) {
|
|
const cap = this.rules.inline.br.exec(src);
|
|
if (cap) {
|
|
return {
|
|
type: 'br',
|
|
raw: cap[0]
|
|
};
|
|
}
|
|
}
|
|
|
|
del(src) {
|
|
const cap = this.rules.inline.del.exec(src);
|
|
if (cap) {
|
|
return {
|
|
type: 'del',
|
|
raw: cap[0],
|
|
text: cap[2],
|
|
tokens: this.lexer.inlineTokens(cap[2])
|
|
};
|
|
}
|
|
}
|
|
|
|
autolink(src, mangle) {
|
|
const cap = this.rules.inline.autolink.exec(src);
|
|
if (cap) {
|
|
let text, href;
|
|
if (cap[2] === '@') {
|
|
text = escape(this.options.mangle ? mangle(cap[1]) : cap[1]);
|
|
href = 'mailto:' + text;
|
|
} else {
|
|
text = escape(cap[1]);
|
|
href = text;
|
|
}
|
|
|
|
return {
|
|
type: 'link',
|
|
raw: cap[0],
|
|
text,
|
|
href,
|
|
tokens: [
|
|
{
|
|
type: 'text',
|
|
raw: text,
|
|
text
|
|
}
|
|
]
|
|
};
|
|
}
|
|
}
|
|
|
|
url(src, mangle) {
|
|
let cap;
|
|
if (cap = this.rules.inline.url.exec(src)) {
|
|
let text, href;
|
|
if (cap[2] === '@') {
|
|
text = escape(this.options.mangle ? mangle(cap[0]) : cap[0]);
|
|
href = 'mailto:' + text;
|
|
} else {
|
|
// do extended autolink path validation
|
|
let prevCapZero;
|
|
do {
|
|
prevCapZero = cap[0];
|
|
cap[0] = this.rules.inline._backpedal.exec(cap[0])[0];
|
|
} while (prevCapZero !== cap[0]);
|
|
text = escape(cap[0]);
|
|
if (cap[1] === 'www.') {
|
|
href = 'http://' + text;
|
|
} else {
|
|
href = text;
|
|
}
|
|
}
|
|
return {
|
|
type: 'link',
|
|
raw: cap[0],
|
|
text,
|
|
href,
|
|
tokens: [
|
|
{
|
|
type: 'text',
|
|
raw: text,
|
|
text
|
|
}
|
|
]
|
|
};
|
|
}
|
|
}
|
|
|
|
inlineText(src, smartypants) {
|
|
const cap = this.rules.inline.text.exec(src);
|
|
if (cap) {
|
|
let text;
|
|
if (this.lexer.state.inRawBlock) {
|
|
text = this.options.sanitize ? (this.options.sanitizer ? this.options.sanitizer(cap[0]) : escape(cap[0])) : cap[0];
|
|
} else {
|
|
text = escape(this.options.smartypants ? smartypants(cap[0]) : cap[0]);
|
|
}
|
|
return {
|
|
type: 'text',
|
|
raw: cap[0],
|
|
text
|
|
};
|
|
}
|
|
}
|
|
}
|