feat: add llms.txt and LLM-friendly markdown docs generation

.gitignore

@@ -181,6 +181,10 @@ slides/webgl
 /public/zh/coding-standard-content.html
 /public/en/coding-standard-content.html
 /public/*.html
+/public/en/llms.txt
+/public/en/llms-documents
+/public/zh/llms.txt
+/public/zh/llms-documents
 
 
 # Editor temporal files

build/build-doc.js

@@ -184,6 +184,15 @@ async function run() {
             console.log('Error happens when copying to dest folders.');
             console.log(e);
         }
+
+        try {
+            const buildLlms = require('./build-llms');
+            buildLlms();
+        }
+        catch (e) {
+            console.log('Error happens when building llms documents.');
+            console.log(e);
+        }
     }
 
     console.log('All done.');

build/build-llms.js

@@ -0,0 +1,370 @@
+/**
+ * Converts built part JSONs (HTML desc) to Markdown using turndown,
+ * and generates llms.txt + individual .md files.
+ *
+ * Mechanically converts documents/*-parts/*.json to llms-documents/ (.md files).
+ * Root files (e.g. option.md) are placed at llms-documents/, while part files
+ * (e.g. option.title.md) are placed at llms-documents/*-parts/.
+ * Type information is extracted from documents/*.json (full schema) via traverse.
+ *
+ * Prerequisites: JSON must be built first (node build.js --env dev)
+ * Usage: node build/build-llms.js --env dev
+ */
+const fs = require('fs');
+const fse = require('fs-extra');
+const path = require('path');
+const globby = require('globby');
+const TurndownService = require('turndown');
+const {gfm} = require('turndown-plugin-gfm');
+const {traverse} = require('../tool/schemaHelper');
+const {readConfigEnvFile} = require('./helper');
+
+// --- Constants ---
+
+const LANGUAGES = ['en', 'zh'];
+const OUTPUT_DIR_NAME = 'llms-documents';
+const MAX_HEADING_DEPTH = 6;
+
+const SECTION_LABELS = {
+    en: {'option-parts': 'Option', 'option-gl-parts': 'Option GL', 'api-parts': 'API', 'tutorial-parts': 'Tutorial'},
+    zh: {'option-parts': '配置项 (Option)', 'option-gl-parts': 'GL配置项 (Option GL)', 'api-parts': 'API', 'tutorial-parts': '教程 (Tutorial)'}
+};
+
+const LLMS_TXT_HEADER = [
+    '# Apache ECharts Documentation',
+    '',
+    '> Apache ECharts is a free, powerful charting and visualization library offering easy ways to add intuitive, interactive, and highly customizable charts to your commercial products.',
+    ''
+].join('\n');
+
+// --- Config ---
+
+const argv = require('yargs').argv;
+const envType = (argv.dev != null || argv.debug != null || argv.env === 'dev') ? 'dev' : argv.env;
+if (!envType) throw new Error('--env MUST be specified');
+const config = readConfigEnvFile(envType);
+
+// --- Turndown ---
+
+const td = new TurndownService({headingStyle: 'atx', codeBlockStyle: 'fenced'});
+td.use(gfm);
+td.addRule('iframe', {filter: 'iframe', replacement: () => ''});
+
+function htmlToMd(html) {
+    return html ? td.turndown(html).replace(/\n{3,}/g, '\n\n').trim() : '';
+}
+
+// --- Extract type info from full schema JSON ---
+
+/**
+ * Extract type and default value info from a full schema JSON by traversing
+ * the nested schema tree.
+ *
+ * @param {string} schemaJsonPath - path to schema JSON (e.g. "documents/option.json")
+ * @param {string} docName - e.g. "option", "api"
+ * @returns {Object<string, {type: string|null, default: string|null}>}
+ *   e.g. { "option.title.show": {type: "boolean", default: "true"} }
+ */
+function buildTypeMap(schemaJsonPath, docName) {
+    if (docName === 'tutorial' || !fs.existsSync(schemaJsonPath)) return {};
+    const schema = JSON.parse(fs.readFileSync(schemaJsonPath, 'utf-8'));
+    const typeMap = {};
+    traverse(schema, docName, (schemaPath, node) => {
+        if (node.type || node.default != null) {
+            typeMap[schemaPath] = {
+                type: node.type ? (Array.isArray(node.type) ? node.type.join('|') : node.type) : null,
+                default: node.default != null
+                    ? (typeof node.default === 'object' ? JSON.stringify(node.default) : String(node.default))
+                    : null
+            };
+        }
+    });
+    return typeMap;
+}
+
+// --- Resolve links in HTML ---
+// Best-effort rewriting of <a href="#path"> and <a href="api.html#path"> in HTML
+// so that turndown produces markdown links pointing to the correct .md files.
+// Some source links have non-standard formats (e.g. missing "#", no dot separator)
+// that cannot be resolved; these are left as-is or linked to the root file.
+
+/**
+ * Split linkPath into a part key (first segment) and fragment (rest), matching
+ * the key against partKeys with case-insensitive and singular/plural fallback.
+ *
+ * @param {string} linkPath - e.g. "title.show", "echarts.init"
+ * @param {Set<string>} partKeys - e.g. Set{'title','series-bar','geo',...}
+ * @returns {{key: string, frag: string|null}|null}
+ *   e.g. "title.show"                    -> {key: "title", frag: "show"}
+ *        "angleAxis.axisLabel.interval"  -> {key: "angleAxis", frag: "axisLabel.interval"}
+ *        "geo"                           -> {key: "geo", frag: null}
+ *        "unknown"                       -> null
+ */
+function tryResolvePartKey(linkPath, partKeys) {
+    const [seg, ...rest] = linkPath.split('.');
+    const frag = rest.length > 0 ? rest.join('.') : null;
+
+    if (partKeys.has(seg)) return {key: seg, frag};
+
+    // Fallback: case-insensitive and singular/plural matching
+    const segL = seg.toLowerCase();
+    for (const k of partKeys) {
+        if (k.toLowerCase() === segL) return {key: k, frag};
+    }
+    for (const k of partKeys) {
+        const kl = k.toLowerCase();
+        if (kl === segL + 's' || kl + 's' === segL) return {key: k, frag};
+    }
+    return null;
+}
+
+/**
+ * Resolve a link path to an href pointing to the correct .md file.
+ * If partKeys contains a match, link to the individual part file;
+ * otherwise fall back to the root file.
+ *
+ * @param {string} linkPath - e.g. "title.show", "visualMap"
+ * @param {Set<string>} partKeys - keys of individual part files
+ * @param {string} pathPrefix - path prefix for part files
+ *   from part: "option"                -> "option.title.md"
+ *   from root: "option-parts/option"   -> "option-parts/option.title.md"
+ *   cross-doc: "../api-parts/api"      -> "../api-parts/api.echarts.md"
+ * @param {string} rootPath - path prefix for root file fallback
+ *   from part: "../option"  -> "../option.md#visualMap"
+ *   from root: "option"     -> "option.md#visualMap"
+ *   cross-doc: "../api"     -> "../api.md#events"
+ * @returns {string} resolved href attribute string
+ */
+function resolveLink(linkPath, partKeys, pathPrefix, rootPath) {
+    const resolved = tryResolvePartKey(linkPath, partKeys);
+    if (!resolved) {
+        return `href="${rootPath}.md#${linkPath}"`;
+    }
+    return `href="${pathPrefix}.${resolved.key}.md${resolved.frag ? '#' + resolved.frag : ''}"`;
+}
+
+/**
+ * Rewrite internal links and image paths in HTML before turndown conversion.
+ * Handles three patterns:
+ *   1. Same-doc:  href="#title.show"            -> href="option.title.md#show"
+ *   2. Cross-doc: href="api.html#echarts.init"  -> href="../api-parts/api.echarts.md#init"
+ *   3. Images:    src="documents/asset/img/..." -> src="../../documents/asset/img/..."
+ * Unresolvable links fall back to the root file.
+ *
+ * @param {string} html - HTML string containing <a href="..."> links
+ * @param {Object<string, Set<string>>} partKeysByDoc - part keys for all docs
+ * @param {string} docName - current doc name (e.g. "option")
+ * @param {boolean} isRoot - whether the current file is a root file
+ * @returns {string} HTML with rewritten href attributes and image paths
+ */
+function tryResolveHtmlLinks(html, partKeysByDoc, docName, isRoot) {
+    const partKeys = partKeysByDoc[docName];
+    // Path prefixes differ depending on whether current file is root or part:
+    //   root (llms-documents/option.md)              -> part: "option-parts/option", root: "option"
+    //   part (llms-documents/option-parts/option.*.md) -> part: "option",            root: "../option"
+    const sameDocPartPrefix = isRoot ? `${docName}-parts/${docName}` : docName;
+    const sameDocRootPath = isRoot ? docName : `../${docName}`;
+    const crossDocPrefix = isRoot ? '' : '../';
+
+    // Same-doc links: href="#title.show" -> href="option.title.md#show"
+    const resolved = html.replace(/href="#([^"]+)"/g, (match, linkPath) =>
+        partKeys ? resolveLink(linkPath, partKeys, sameDocPartPrefix, sameDocRootPath) : match
+    );
+
+    // Cross-doc links: href="api.html#echarts.init" -> href="../api-parts/api.echarts.md#init"
+    const crossResolved = resolved.replace(
+        /href="(option-gl|option|api|tutorial)\.html#([^"]+)"/g,
+        (match, targetDoc, fragment) => {
+            const keys = partKeysByDoc[targetDoc];
+            if (!keys) return match;
+            return resolveLink(fragment, keys, `${crossDocPrefix}${targetDoc}-parts/${targetDoc}`, `${crossDocPrefix}${targetDoc}`);
+        }
+    );
+
+    // Image paths: src="documents/asset/..." -> relative path to public/{lang}/documents/asset/
+    const imgPrefix = isRoot ? '../' : '../../';
+    return crossResolved.replace(
+        /src="(documents\/asset\/[^"]*)"/g,
+        (_, src) => `src="${imgPrefix}${src}"`
+    );
+}
+
+// --- Convert part JSON to Markdown ---
+
+function formatPropertyEntry(key, entry, typeInfo, linkResolver) {
+    const heading = '#'.repeat(Math.min(key.split('.').length + 1, MAX_HEADING_DEPTH)) + ' ' + key;
+    const meta = [
+        typeInfo && typeInfo.type && `- **Type**: \`${typeInfo.type}\``,
+        typeInfo && typeInfo.default != null && `- **Default**: \`${typeInfo.default}\``
+    ].filter(Boolean);
+    const body = entry.desc ? htmlToMd(linkResolver(entry.desc)) : '';
+    return [heading, ...meta, ...(body ? ['', body] : []), ''];
+}
+
+function jsonToMd(data, typeMap, baseName, linkResolver) {
+    const lines = Object.entries(data).flatMap(([key, entry]) => {
+        const fullKey = baseName ? `${baseName}.${key}` : key;
+        return formatPropertyEntry(key, entry, typeMap[fullKey], linkResolver);
+    });
+    return lines.join('\n').replace(/\n{3,}/g, '\n\n').trimEnd() + '\n';
+}
+
+// --- Collect part JSON files ---
+
+/**
+ * Collect part JSON files for each *-parts/ directory, excluding outline files.
+ *
+ * @param {string[]} partsDirs - paths to *-parts/ directories
+ * @returns {Object<string, string[]>} dir path -> JSON file paths
+ */
+function collectPartJsonFiles(partsDirs) {
+    const jsonFilesByDir = {};
+    for (const dir of partsDirs) {
+        jsonFilesByDir[dir] = globby.sync('*.json', { cwd: dir, absolute: true })
+            .filter(filePath => !path.basename(filePath).includes('-outline'));
+    }
+    return jsonFilesByDir;
+}
+
+// --- Collect file keys for link resolution across docs ---
+
+/**
+ * Build a map of doc name -> Set of part keys for all *-parts/ directories.
+ * Part keys are file names with the doc name stripped (e.g. "option.title" -> "title").
+ * Root files (e.g. "option.json") are excluded since they are not individual part files.
+ *
+ * @param {string[]} partsDirs - paths to *-parts/ directories
+ * @param {Object<string, string[]>} jsonFilesByDir - pre-collected JSON file paths
+ * @returns {Object<string, Set<string>>} partKeysByDoc - e.g. { option: Set{'title','geo',...}, api: Set{'echarts',...} }
+ */
+function buildPartKeysByDoc(partsDirs, jsonFilesByDir) {
+    const partKeysByDoc = {};
+    for (const dir of partsDirs) {
+        const docName = path.basename(dir).replace(/-parts$/, '');
+        partKeysByDoc[docName] = new Set(
+            jsonFilesByDir[dir].map(filePath => path.basename(filePath, '.json'))
+                .filter(k => k !== docName)
+                .map(k => k.startsWith(docName + '.') ? k.slice(docName.length + 1) : k)
+        );
+    }
+    return partKeysByDoc;
+}
+
+// --- Process a single *-parts/ directory ---
+
+/**
+ * Convert part JSON files in a single *-parts/ directory to Markdown.
+ * Each JSON file becomes a .md file with resolved links and type info.
+ * Root files (e.g. option.json) are output to the parent directory.
+ *
+ * @param {string} partsDir - path to a *-parts/ directory (e.g. "documents/option-parts")
+ * @param {string} outDir - output base directory (e.g. "llms-documents")
+ * @param {Object} typeMap - property path -> {type, default} map
+ * @param {Object<string, Set<string>>} partKeysByDoc - part keys for all docs
+ * @param {string[]} jsonFiles - pre-collected JSON file paths for this directory
+ * @returns {{name: string, path: string, section: string}[]} output file descriptors
+ */
+function processPartsDir(partsDir, outDir, typeMap, partKeysByDoc, jsonFiles) {
+    const dirName = path.basename(partsDir);
+    const docName = dirName.replace(/-parts$/, '');
+
+    return jsonFiles.map(filePath => {
+        const baseName = path.basename(filePath, '.json');
+        const data = JSON.parse(fs.readFileSync(filePath, 'utf-8'));
+        const isRoot = baseName === docName;
+        const linkResolver = (html) => tryResolveHtmlLinks(html, partKeysByDoc, docName, isRoot);
+        const content = `# ${baseName}\n\n` + jsonToMd(data, typeMap, baseName, linkResolver);
+        const fileName = isRoot ? `${baseName}.md` : `${dirName}/${baseName}.md`;
+        const fullPath = path.resolve(outDir, fileName);
+        fse.ensureDirSync(path.dirname(fullPath));
+        fs.writeFileSync(fullPath, content, 'utf-8');
+        return {name: fileName, path: fullPath, section: dirName};
+    });
+}
+
+// --- Generate docs for a single language ---
+
+function generateDocsForLang(lang) {
+    const docsDir = path.resolve(config.releaseDestDir, lang, 'documents');
+    const outDir = path.resolve(config.releaseDestDir, lang, OUTPUT_DIR_NAME);
+    fse.ensureDirSync(outDir);
+
+    // Step 1: Build a type map from full schema JSONs (option.json, api.json, etc.)
+    //         by traversing the nested schema tree to collect type/default for each
+    //         property path (e.g. "option.title.show" -> {type: "boolean", default: "true"}).
+    const schemaFiles = globby.sync('*.json', { cwd: docsDir, absolute: true });
+    const typeMap = {};
+    for (const filePath of schemaFiles) {
+        Object.assign(typeMap, buildTypeMap(filePath, path.basename(filePath, '.json')));
+    }
+
+    // Step 2: Collect part JSON files and file keys for all *-parts/ directories upfront,
+    //         so that cross-doc links can be resolved against actual files.
+    const partsDirs = globby.sync('*-parts', {
+        cwd: docsDir,
+        absolute: true,
+        onlyDirectories: true
+    });
+    const jsonFilesByDir = collectPartJsonFiles(partsDirs);
+    const partKeysByDoc = buildPartKeysByDoc(partsDirs, jsonFilesByDir);
+
+    // Step 3: For each *-parts/ directory, read part JSONs (e.g. option.title.json),
+    //         resolve internal links in HTML, convert desc to Markdown via turndown,
+    //         attach type/default from the type map, and write as .md files.
+    const files = partsDirs
+        .flatMap(dir => processPartsDir(dir, outDir, typeMap, partKeysByDoc, jsonFilesByDir[dir]))
+        .sort((a, b) => a.name.localeCompare(b.name));
+
+    console.log(`Generated ${files.length} docs for ${lang}`);
+    return files;
+}
+
+// --- llms.txt ---
+
+function writeLlmsTxt(lang, files) {
+    const langDir = path.resolve(config.releaseDestDir, lang);
+    fse.ensureDirSync(langDir);
+    const labels = SECTION_LABELS[lang] || SECTION_LABELS.en;
+    const groups = {};
+    for (const file of files) {
+        if (!groups[file.section]) groups[file.section] = [];
+        groups[file.section].push(file);
+    }
+
+    const sections = Object.keys(groups)
+        .sort()
+        .flatMap(sectionKey => [
+            `## ${labels[sectionKey] || sectionKey}`, '',
+            ...groups[sectionKey]
+                .sort((a, b) => {
+                    const aIsRoot = !a.name.includes('/');
+                    const bIsRoot = !b.name.includes('/');
+                    if (aIsRoot !== bIsRoot) return aIsRoot ? -1 : 1;
+                    return a.name.localeCompare(b.name);
+                })
+                .map(file =>
+                    `- [${path.basename(file.name, '.md')}](${OUTPUT_DIR_NAME}/${file.name})`
+                ),
+            ''
+        ]);
+
+    const content = [LLMS_TXT_HEADER, ...sections].join('\n').trimEnd() + '\n';
+    fs.writeFileSync(path.join(langDir, 'llms.txt'), content, 'utf-8');
+    console.log(`Generated ${lang}/llms.txt`);
+}
+
+// --- Main ---
+
+function buildLlms() {
+    console.log('Building llms documents ...');
+    for (const lang of LANGUAGES) {
+        // Step 1-2: Generate individual .md files from part JSONs.
+        const files = generateDocsForLang(lang);
+        // Step 3: Generate llms.txt index listing all .md files.
+        if (files.length > 0) writeLlmsTxt(lang, files);
+    }
+    console.log('Build llms documents done.');
+}
+
+module.exports = buildLlms;
+if (require.main === module) buildLlms();