feat(vant-markdown-loader): rEADME 中引入 demo 组件时支持设置 playground 属性

packages/vant-markdown-loader/src/extract-demo.js

@@ -1,22 +1,33 @@
 const path = require('path');
+const fs = require('fs');
+const parser = require('./md-parser');
+
+function hyphenate(str) {
+  return str.replace(/\B([A-Z])/g, '-$1').toLowerCase();
+}
 
 module.exports = function extraDemo(content) {
+  const markdownDir = path.dirname(this.resourcePath);
   const demoLinks = [];
 
-  /*
-   * 提取 README 中的 demo 文件路径，例如下面的内容，就会提取为 ['./demo-link/index.vue']
-   * ```demo
-   * ./demo-link/index.vue
-   * ```
-   */
   content = content.replace(
-    /<pre><code class="language-demo">([\s\S]*?)<\/code><\/pre>/g,
-    function (_, link) {
+    /<demo-code([\s\S]*?)>([\s\S]*?)<\/demo-code>/g,
+    function (_, attrs, link) {
       link = link.trim(); // 去换行符
-      demoLinks.push(link);
-      const demoFileName = path.basename(link, '.vue'); // 获取文件名
-      const tag = demoFileName.replace(/\B([A-Z])/g, '-$1').toLowerCase(); // 驼峰转连字符
-      return `<${tag} />`;
+      const tag = hyphenate(path.basename(link, '.vue'));
+      const fullLink = path.join(markdownDir, link);
+      demoLinks.indexOf(fullLink) === -1 && demoLinks.push(fullLink);
+      const demoContent = fs.readFileSync(fullLink, { encoding: 'utf8' });
+      const demoParseredContent = parser.render(
+        '```html\n' + demoContent + '\n```'
+      );
+      return `
+        <demo-playground${attrs}
+        origin-code="${escape(demoContent)}"
+        code-snippet="${escape(demoParseredContent)}">
+          <${tag} />
+        </demo-playground>
+      `;
     }
   );
 

packages/vant-markdown-loader/src/index.js

@@ -1,24 +1,20 @@
 const path = require('path');
 const loaderUtils = require('loader-utils');
-const MarkdownIt = require('markdown-it');
-const markdownItAnchor = require('markdown-it-anchor');
 const frontMatter = require('front-matter');
-const highlight = require('./highlight');
+const parser = require('./md-parser');
 const linkOpen = require('./link-open');
 const cardWrapper = require('./card-wrapper');
 const extractDemo = require('./extract-demo');
 const sideEffectTags = require('./side-effect-tags');
-const { slugify } = require('transliteration');
 
 function camelize(str) {
   return str.replace(/-(\w)/g, (_, c) => (c ? c.toUpperCase() : ''));
 }
 
 function wrapper(content) {
-  const markdownDir = path.dirname(this.resourcePath);
   let demoLinks;
   let styles;
-  [content, demoLinks] = extractDemo(content);
+  [content, demoLinks] = extractDemo.call(this, content);
   [content, styles] = sideEffectTags(content);
   content = cardWrapper(content);
   return `
@@ -31,9 +27,7 @@ function wrapper(content) {
 <script>
 ${demoLinks
   .map((link) => {
-    const absPath = path.join(markdownDir, link); // 获取 demo 文件的完整路径
-    const demoFileName = path.basename(link, '.vue');
-    return `import ${camelize(demoFileName)} from '${absPath}';`;
+    return `import ${camelize(path.basename(link, '.vue'))} from '${link}';`;
   })
   .join('\n')}
 
@@ -67,14 +61,6 @@ ${styles.join('\n')}
 `;
 }
 
-const parser = new MarkdownIt({
-  html: true,
-  highlight,
-}).use(markdownItAnchor, {
-  level: 2,
-  slugify,
-});
-
 module.exports = function (source) {
   let options = loaderUtils.getOptions(this) || {};
   this.cacheable && this.cacheable();

packages/vant-markdown-loader/src/md-parser.js

@@ -0,0 +1,14 @@
+const MarkdownIt = require('markdown-it');
+const markdownItAnchor = require('markdown-it-anchor');
+const highlight = require('./highlight');
+const { slugify } = require('transliteration');
+
+const parser = new MarkdownIt({
+  html: true,
+  highlight,
+}).use(markdownItAnchor, {
+  level: 2,
+  slugify,
+});
+
+module.exports = parser;