mirror of
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4ff7e1a419
- Consolidate our build and watch to a single build.js file. - Update contributing docs. - Remove unused scripts and package.json script entries.
349 lines
9.6 KiB
JavaScript
349 lines
9.6 KiB
JavaScript
/**
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* Copyright (c) Microsoft Corporation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// @ts-check
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/** @typedef {{
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* type: 'text' | 'li' | 'code' | 'properties' | 'h0' | 'h1' | 'h2' | 'h3' | 'h4',
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* text?: string,
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* codeLang?: string,
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* lines?: string[],
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* liType?: 'default' | 'bullet' | 'ordinal',
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* children?: MarkdownNode[]
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* }} MarkdownNode */
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function flattenWrappedLines(content) {
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const inLines = content.split('\n');
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let inCodeBlock = false;
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const outLines = [];
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let outLineTokens = [];
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for (const line of inLines) {
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const trimmedLine = line.trim();
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let singleLineExpression = line.startsWith('#');
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let flushLastParagraph = !trimmedLine
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|| trimmedLine.startsWith('1.')
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|| trimmedLine.startsWith('<')
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|| trimmedLine.startsWith('>')
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|| trimmedLine.startsWith('|')
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|| trimmedLine.startsWith('-')
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|| trimmedLine.startsWith('*')
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|| line.match(/\[[^\]]+\]:.*/)
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|| singleLineExpression;
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if (trimmedLine.startsWith('```') || trimmedLine.startsWith('---')) {
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inCodeBlock = !inCodeBlock;
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flushLastParagraph = true;
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}
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if (flushLastParagraph && outLineTokens.length) {
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outLines.push(outLineTokens.join(' '));
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outLineTokens = [];
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}
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if (inCodeBlock || singleLineExpression)
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outLines.push(line);
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else if (trimmedLine)
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outLineTokens.push(outLineTokens.length ? line.trim() : line);
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}
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if (outLineTokens.length)
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outLines.push(outLineTokens.join(' '));
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return outLines;
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}
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/**
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* @param {string[]} lines
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*/
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function buildTree(lines) {
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/** @type {MarkdownNode} */
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const root = {
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type: 'h0',
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text: '<root>',
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children: []
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};
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/** @type {MarkdownNode[]} */
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const headerStack = [root];
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/** @type {{ indent: string, node: MarkdownNode }[]} */
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let sectionStack = [];
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/**
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* @param {string} indent
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* @param {MarkdownNode} node
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*/
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const appendNode = (indent, node) => {
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while (sectionStack.length && sectionStack[0].indent.length >= indent.length)
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sectionStack.shift();
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const parentNode = sectionStack.length ? sectionStack[0].node :headerStack[0];
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if (!parentNode.children)
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parentNode.children = [];
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parentNode.children.push(node);
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if (node.type === 'li')
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sectionStack.unshift({ indent, node });
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};
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for (let i = 0; i < lines.length; ++i) {
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let line = lines[i];
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// Headers form hierarchy.
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const header = line.match(/^(#+)/);
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if (header) {
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const h = header[1].length;
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const node = /** @type {MarkdownNode} */({ type: 'h' + h, text: line.substring(h + 1), children: [] });
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while (true) {
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const lastH = +headerStack[0].type.substring(1);
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if (h <= lastH)
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headerStack.shift();
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else
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break;
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}
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headerStack[0].children.push(node);
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headerStack.unshift(node);
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continue;
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}
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// Remaining items respect indent-based nesting.
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const [, indent, content] = line.match('^([ ]*)(.*)');
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if (content.startsWith('```')) {
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/** @type {MarkdownNode} */
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const node = {
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type: 'code',
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lines: [],
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codeLang: content.substring(3)
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};
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line = lines[++i];
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while (!line.trim().startsWith('```')) {
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if (!line.startsWith(indent))
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throw new Error('Bad code block ' + line);
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node.lines.push(line.substring(indent.length));
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line = lines[++i];
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}
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appendNode(indent, node);
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continue;
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}
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if (content.startsWith('---')) {
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/** @type {MarkdownNode} */
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const node = {
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type: 'properties',
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lines: [],
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};
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line = lines[++i];
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while (!line.trim().startsWith('---')) {
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if (!line.startsWith(indent))
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throw new Error('Bad header block ' + line);
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node.lines.push(line.substring(indent.length));
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line = lines[++i];
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}
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appendNode(indent, node);
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continue;
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}
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const liType = content.match(/^(-|1.|\*) /);
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const node = /** @type {MarkdownNode} */({ type: 'text', text: content });
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if (liType) {
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node.type = 'li';
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node.text = content.substring(liType[0].length);
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if (content.startsWith('1.'))
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node.liType = 'ordinal';
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else if (content.startsWith('*'))
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node.liType = 'bullet';
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else
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node.liType = 'default';
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}
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appendNode(indent, node);
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}
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return root.children;
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}
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/**
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* @param {string} content
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*/
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function parse(content) {
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return buildTree(flattenWrappedLines(content));
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}
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/**
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* @param {MarkdownNode[]} nodes
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* @param {number=} maxColumns
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*/
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function render(nodes, maxColumns) {
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const result = [];
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let lastNode;
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for (let node of nodes) {
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innerRenderMdNode('', node, lastNode, result, maxColumns);
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lastNode = node;
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}
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return result.join('\n');
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}
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/**
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* @param {string} indent
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* @param {MarkdownNode} node
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* @param {MarkdownNode} lastNode
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* @param {number=} maxColumns
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* @param {string[]} result
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*/
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function innerRenderMdNode(indent, node, lastNode, result, maxColumns) {
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const newLine = () => {
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if (result[result.length - 1] !== '')
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result.push('');
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};
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if (node.type.startsWith('h')) {
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newLine();
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const depth = +node.type.substring(1);
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result.push(`${'#'.repeat(depth)} ${node.text}`);
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let lastNode = node;
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for (const child of node.children || []) {
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innerRenderMdNode('', child, lastNode, result, maxColumns);
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lastNode = child;
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}
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}
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if (node.type === 'text') {
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const bothTables = node.text.startsWith('|') && lastNode && lastNode.type === 'text' && lastNode.text.startsWith('|');
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const bothGen = node.text.startsWith('<!--') && lastNode && lastNode.type === 'text' && lastNode.text.startsWith('<!--');
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const bothComments = node.text.startsWith('>') && lastNode && lastNode.type === 'text' && lastNode.text.startsWith('>');
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const bothLinks = node.text.match(/\[[^\]]+\]:/) && lastNode && lastNode.type === 'text' && lastNode.text.match(/\[[^\]]+\]:/);
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if (!bothTables && !bothGen && !bothComments && !bothLinks && lastNode && lastNode.text)
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newLine();
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result.push(wrapText(node.text, maxColumns, indent));
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return;
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}
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if (node.type === 'code') {
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newLine();
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result.push(`${indent}\`\`\`${node.codeLang}`);
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for (const line of node.lines)
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result.push(indent + line);
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result.push(`${indent}\`\`\``);
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newLine();
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return;
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}
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if (node.type === 'properties') {
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result.push(`${indent}---`);
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for (const line of node.lines)
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result.push(indent + line);
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result.push(`${indent}---`);
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newLine();
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return;
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}
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if (node.type === 'li') {
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let char;
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switch (node.liType) {
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case 'bullet': char = '*'; break;
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case 'default': char = '-'; break;
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case 'ordinal': char = '1.'; break;
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}
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result.push(`${wrapText(node.text, maxColumns, `${indent}${char} `)}`);
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const newIndent = indent + ' '.repeat(char.length + 1);
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for (const child of node.children || []) {
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innerRenderMdNode(newIndent, child, lastNode, result, maxColumns);
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lastNode = child;
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}
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}
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}
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/**
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* @param {string} text
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*/
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function tokenizeNoBreakLinks(text) {
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const links = [];
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// Don't wrap simple links with spaces.
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text = text.replace(/\[[^\]]+\]/g, match => {
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links.push(match);
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return `[${links.length - 1}]`;
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});
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return text.split(' ').map(c => c.replace(/\[(\d+)\]/g, (_, p1) => links[+p1]));
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}
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/**
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* @param {string} text
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* @param {number=} maxColumns
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* @param {string=} prefix
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*/
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function wrapText(text, maxColumns = 0, prefix = '') {
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if (!maxColumns)
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return prefix + text;
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if (text.trim().startsWith('|'))
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return prefix + text;
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const indent = ' '.repeat(prefix.length);
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const lines = [];
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maxColumns -= indent.length;
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const words = tokenizeNoBreakLinks(text);
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let line = '';
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for (const word of words) {
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if (line.length && line.length + word.length < maxColumns) {
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line += ' ' + word;
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} else {
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if (line)
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lines.push(line);
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line = (lines.length ? indent : prefix) + word;
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}
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}
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if (line)
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lines.push(line);
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return lines.join('\n');
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}
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/**
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* @param {MarkdownNode} node
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*/
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function clone(node) {
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const copy = { ...node };
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copy.children = copy.children ? copy.children.map(c => clone(c)) : undefined;
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return copy;
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}
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/**
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* @param {MarkdownNode[]} nodes
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* @param {function(MarkdownNode, number): void} visitor
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*/
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function visitAll(nodes, visitor) {
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for (const node of nodes)
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visit(node, visitor);
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}
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/**
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* @param {MarkdownNode} node
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* @param {function(MarkdownNode, number): void} visitor
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*/
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function visit(node, visitor, depth = 0) {
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visitor(node, depth);
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for (const n of node.children || [])
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visit(n, visitor, depth + 1);
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}
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/**
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* @param {MarkdownNode[]} nodes
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* @returns {string}
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*/
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function generateToc(nodes) {
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const result = [];
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visitAll(nodes, (node, depth) => {
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if (node.type === 'h1' || node.type === 'h2') {
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let link = node.text.toLowerCase();
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link = link.replace(/[ ]+/g, '-');
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link = link.replace(/[^\w-]/g, '');
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result.push(`${' '.repeat(depth * 2)}- [${node.text}](#${link})`);
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}
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});
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return result.join('\n');
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}
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module.exports = { parse, render, clone, visitAll, visit, generateToc };
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