{"id":2609,"date":"2026-01-21T18:01:14","date_gmt":"2026-01-21T10:01:14","guid":{"rendered":"https:\/\/womeifei.cn\/?p=2609"},"modified":"2026-01-21T18:01:14","modified_gmt":"2026-01-21T10:01:14","slug":"astabstract-syntax-tree","status":"publish","type":"post","link":"https:\/\/womeifei.cn\/index.php\/2026\/01\/21\/astabstract-syntax-tree\/","title":{"rendered":"AST(Abstract Syntax Tree)"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">\u4ec0\u4e48\u662fAST?<\/h2>\n\n\n\n<p>AST \u5c31\u662f\u628a\u4f60\u7684\u4ee3\u7801\uff0c\u7ffb\u8bd1\u6210\u201c\u673a\u5668\u80fd\u8bfb\u61c2\u7684\u76ee\u5f55\u7ed3\u6784\u201d<\/p>\n\n\n\n<p>\u4f60\u5199\u4ee3\u7801\u65f6\u5199\u7684\u662f\u5b57\u7b26\u4e32\uff08String\uff09\uff0c\u6bd4\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>const name = \"Gemini\";<\/code><\/pre>\n\n\n\n<p>\u5bf9\u4e8e\u7535\u8111\u6765\u8bf4\uff0c\u8fd9\u53ea\u662f\u4e00\u4e32\u5b57\u7b26\u3002\u4e3a\u4e86\u7406\u89e3\u5b83\uff0c\u7535\u8111\u9700\u8981\u50cf\u6211\u4eec\u5728\u8bed\u6587\u8bfe\u4e0a\u505a\u201c\u4e3b\u8c13\u5bbe\u201d\u5206\u6790\u4e00\u6837\uff0c\u628a\u5b83\u62c6\u89e3\u5f00\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>const<\/code> \u662f<strong>\u58f0\u660e<\/strong>\uff08\u50cf\u52a8\u8bcd\uff09<\/li>\n\n\n\n<li><code>name<\/code> \u662f<strong>\u53d8\u91cf\u540d<\/strong>\uff08\u50cf\u540d\u8bcd\uff09<\/li>\n\n\n\n<li><code>=<\/code> \u662f<strong>\u64cd\u4f5c\u7b26<\/strong><\/li>\n\n\n\n<li><code>\"Gemini\"<\/code> \u662f<strong>\u503c<\/strong>\uff08\u5b57\u7b26\u4e32\uff09<\/li>\n<\/ul>\n\n\n\n<p>\u628a\u8fd9\u4e9b\u6210\u5206\u6309\u7167\u5c42\u7ea7\u5173\u7cfb\u6302\u5728\u4e00\u68f5\u6811\u4e0a\uff0c\u5c31\u662f AST\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">AST\u600e\u4e48\u751f\u6210\u7684?<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u7b2c\u4e00\u6b65\uff1a\u8bcd\u6cd5\u5206\u6790 (Lexical Analysis) \u2014\u2014 \u5206\u8bcd<\/h3>\n\n\n\n<p>\u5c31\u50cf\u628a\u4e00\u7bc7\u6587\u7ae0\u5207\u5206\u6210\u4e00\u4e2a\u4e2a\u5355\u8bcd\u3002\u7f16\u8bd1\u5668\u4f1a\u628a\u4ee3\u7801\u5b57\u7b26\u4e32\u5207\u5272\u6210\u4e00\u4e2a\u4e2a\u6700\u5c0f\u5355\u4f4d\uff0c\u53eb\u505a <strong>Token\uff08\u8bcd\u6cd5\u5355\u5143\uff09<\/strong>\u3002<\/p>\n\n\n\n<p><strong>\u4ee3\u7801\uff1a<\/strong><\/p>\n\n\n\n<p>JavaScript<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>const a = 1;\n<\/code><\/pre>\n\n\n\n<p><strong>\u5207\u5206\u540e\u7684 Tokens\uff08\u6570\u7ec4\uff09\uff1a<\/strong><\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><code>const<\/code> (\u5173\u952e\u5b57)<\/li>\n\n\n\n<li><code>a<\/code> (\u6807\u8bc6\u7b26)<\/li>\n\n\n\n<li><code>=<\/code> (\u8d4b\u503c\u7b26\u53f7)<\/li>\n\n\n\n<li><code>1<\/code> (\u6570\u5b57\u5b57\u9762\u91cf)<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">\u7b2c\u4e8c\u6b65\uff1a\u8bed\u6cd5\u5206\u6790 (Syntactic Analysis) \u2014\u2014 \u5efa\u6811<\/h3>\n\n\n\n<p>\u628a\u4e0a\u9762\u7684 Tokens \u6309\u7167\u8bed\u6cd5\u89c4\u5219\uff0c\u62fc\u88c5\u6210\u4e00\u4e2a\u6811\u72b6\u7ed3\u6784\u3002<\/p>\n\n\n\n<p><strong>AST \u7ed3\u6784\uff08\u7b80\u5316\u7248 JSON \u8868\u793a\uff09\uff1a<\/strong><\/p>\n\n\n\n<p>JSON<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>{\n  \"type\": \"Program\", \/\/ \u6839\u8282\u70b9\n  \"body\": &#91;\n    {\n      \"type\": \"VariableDeclaration\", \/\/ \u53d8\u91cf\u58f0\u660e\u8bed\u53e5\n      \"kind\": \"const\",               \/\/ \u7c7b\u578b\u662f const\n      \"declarations\": &#91;\n        {\n          \"type\": \"VariableDeclarator\",\n          \"id\": {\n            \"type\": \"Identifier\",    \/\/ \u6807\u8bc6\u7b26\n            \"name\": \"a\"              \/\/ \u540d\u5b57\u662f a\n          },\n          \"init\": {\n            \"type\": \"Literal\",       \/\/ \u5b57\u9762\u91cf\n            \"value\": 1,              \/\/ \u503c\u662f 1\n            \"raw\": \"1\"\n          }\n        }\n      ]\n    }\n  ]\n}\n<\/code><\/pre>\n\n\n\n<p>\u4ee3\u7801\u91cc\u7684\u7a7a\u683c\u3001\u5206\u53f7\u3001\u62ec\u53f7\u90fd\u4e0d\u89c1\u4e86\uff08\u6240\u4ee5\u53eb\u201c\u62bd\u8c61\u201d\uff09\uff0c\u53ea\u7559\u4e0b\u4e86\u6838\u5fc3\u903b\u8f91\u7ed3\u6784\uff08\u6240\u4ee5\u53eb\u201c\u8bed\u6cd5\u6811\u201d\uff09\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e3a\u4ec0\u4e48 Tree Shaking \u5fc5\u987b\u4f9d\u8d56 AST?<\/h2>\n\n\n\n<p><strong>\u6709\u4e86 AST\uff0c\u5de5\u5177\u5c31\u80fd\u5f00\u542f\u201c\u4e0a\u5e1d\u89c6\u89d2\u201d\uff1a<\/strong><\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>\u626b\u63cf\uff1a<\/strong> \u5b83\u904d\u5386\u8fd9\u68f5\u6811\uff0c\u770b\u5230 <code>import { A } from '.\/utils'<\/code>\uff0c\u5c31\u5728 AST \u8282\u70b9\u4e0a\u6253\u4e2a\u6807\uff1a\u201c\u5f15\u5165\u4e86 A\u201d\u3002<\/li>\n\n\n\n<li><strong>\u8ffd\u8e2a\uff1a<\/strong> \u5b83\u63a5\u7740\u770b\u540e\u9762\u7684 AST \u8282\u70b9\uff0c\u53d1\u73b0\u4ece\u5934\u5230\u5c3e\u53ea\u6709 <code>console.log(B)<\/code>\uff0c\u5e76\u6ca1\u6709\u4efb\u4f55\u8282\u70b9\u7528\u5230\u53d8\u91cf <code>A<\/code>\u3002<\/li>\n\n\n\n<li><strong>\u6447\u6811\uff1a<\/strong> \u65e2\u7136 AST \u544a\u8bc9\u6211\u53d8\u91cf <code>A<\/code> \u7684\u8282\u70b9\u867d\u7136\u88ab\u5f15\u5165\u4e86\uff0c\u4f46\u6ca1\u6709\u88ab\u4efb\u4f55\u540e\u7eed\u8282\u70b9\u5f15\u7528\uff08Reference\uff09\uff0c\u90a3\u8fd9\u6bb5 AST \u5206\u652f\u5c31\u53ef\u4ee5\u88ab\u526a\u6389\u3002<\/li>\n\n\n\n<li><strong>\u751f\u6210\uff1a<\/strong> \u6700\u540e\u628a\u4fee\u526a\u597d\u7684 AST \u91cd\u65b0\u53d8\u56de\u4ee3\u7801\u5b57\u7b26\u4e32\uff08\u8fd9\u4e2a\u8fc7\u7a0b\u53eb <code>generate<\/code>\uff09\u3002<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">AST\u7684\u5176\u4ed6\u5e94\u7528<\/h2>\n\n\n\n<p>AST \u662f\u524d\u7aef\u5de5\u7a0b\u5316\u7684<strong>\u57fa\u77f3<\/strong>\u3002\u9664\u4e86 Tree Shaking\uff0c\u4f60\u6bcf\u5929\u7528\u7684\u5de5\u5177\u90fd\u5728\u7528 AST\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Babel\uff1a<\/strong> \u628a ES6 \u7684 AST \u8f6c\u6362\u6210 ES5 \u7684 AST\uff0c\u518d\u751f\u6210\u4ee3\u7801\uff08\u8fd9\u5c31\u53eb\u8f6c\u8bd1\uff09\u3002<\/li>\n\n\n\n<li><strong>ESLint\uff1a<\/strong> \u904d\u5386 AST\uff0c\u53d1\u73b0\u6709\u4e00\u4e2a\u8282\u70b9\u7684\u7c7b\u578b\u662f <code>VariableDeclaration<\/code> \u4e14\u7528\u4e86 <code>var<\/code>\uff0c\u5c31\u62a5\u9519\u201c\u8bf7\u4f7f\u7528 let\/const\u201d\u3002<\/li>\n\n\n\n<li><strong>Prettier\uff1a<\/strong> \u4e0d\u7ba1\u4f60\u4ee3\u7801\u5199\u5f97\u591a\u4e71\uff0c\u5b83\u5148\u89e3\u6790\u6210 AST\uff0c\u7136\u540e\u6309\u7167\u6807\u51c6\u7684\u7f29\u8fdb\u89c4\u5219\u91cd\u65b0\u751f\u6210\u4ee3\u7801\uff0c\u683c\u5f0f\u5c31\u53d8\u597d\u770b\u4e86\u3002<\/li>\n\n\n\n<li><strong>Vue\/React \u6a21\u677f\u7f16\u8bd1\uff1a<\/strong> \u628a <code>&lt;div v-if=\"...\"><\/code> \u53d8\u6210 AST\uff0c\u7136\u540e\u8f6c\u6362\u6210 JavaScript \u7684\u6e32\u67d3\u51fd\u6570\uff08Render Function\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u603b\u7ed3<\/h2>\n\n\n\n<p>AST \u5c31\u662f\u4ee3\u7801\u7684\u201c\u9aa8\u67b6\u201d\u3002Vite (Rollup) \u901a\u8fc7\u5206\u6790\u8fd9\u526f\u9aa8\u67b6\uff0c\u7cbe\u51c6\u5730\u5254\u9664\u6389\u4e86\u591a\u4f59\u7684\u9aa8\u5934\uff08\u65e0\u7528\u4ee3\u7801\uff09\uff0c\u8fd9\u5c31\u662f Tree Shaking \u7684\u672c\u8d28\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4ec0\u4e48\u662fAST? AST \u5c31\u662f\u628a\u4f60\u7684\u4ee3\u7801\uff0c\u7ffb\u8bd1\u6210\u201c\u673a\u5668\u80fd\u8bfb\u61c2\u7684\u76ee\u5f55\u7ed3\u6784\u201d \u4f60\u5199\u4ee3\u7801\u65f6\u5199\u7684\u662f\u5b57\u7b26\u4e32\uff08String\uff09 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[51,1],"tags":[],"class_list":["post-2609","post","type-post","status-publish","format-standard","hentry","category-vite","category-1"],"_links":{"self":[{"href":"https:\/\/womeifei.cn\/index.php\/wp-json\/wp\/v2\/posts\/2609","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/womeifei.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/womeifei.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/womeifei.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/womeifei.cn\/index.php\/wp-json\/wp\/v2\/comments?post=2609"}],"version-history":[{"count":1,"href":"https:\/\/womeifei.cn\/index.php\/wp-json\/wp\/v2\/posts\/2609\/revisions"}],"predecessor-version":[{"id":2610,"href":"https:\/\/womeifei.cn\/index.php\/wp-json\/wp\/v2\/posts\/2609\/revisions\/2610"}],"wp:attachment":[{"href":"https:\/\/womeifei.cn\/index.php\/wp-json\/wp\/v2\/media?parent=2609"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/womeifei.cn\/index.php\/wp-json\/wp\/v2\/categories?post=2609"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/womeifei.cn\/index.php\/wp-json\/wp\/v2\/tags?post=2609"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}