AST操作之构造节点信息

AST抽象语法树/9.AST操作之构造节点信息/README.md

@@ -0,0 +1,43 @@
+# AST操作之构造节点信息
+
+需求：将var a;将其转化为var a = 1 + 2;
+
+```javascript
+const fs = require('fs');
+const {parse} = require("@babel/parser");
+const traverse = require("@babel/traverse").default;
+const generator = require("@babel/generator").default;
+let encode_file = "./encode.js";
+
+let js_code = fs.readFileSync(encode_file, {encoding: "utf-8"});
+let ast = parse(js_code, {
+    sourceType: 'module',
+});
+
+const visitor = {
+    VariableDeclarator(path) {
+        // 使用解构赋值语法 {} 是用来从对象中提取特定属性或方法
+        const {init} = path.node
+        console.log({init})
+        const node = {
+            type: "BinaryExpression",
+            operator: "+",
+            left: {
+                type: "NumericLiteral",
+                value: 1
+            },
+            right: {
+                type: "NumericLiteral",
+                value: 2
+            }
+        }
+        // 在 JavaScript 中，|| 是逻辑运算符之一，表示逻辑或（OR）
+        init || path.set("init", node)
+    },
+}
+
+traverse(ast, visitor);
+let {code} = generator(ast);
+console.log(code)
+```
+

AST抽象语法树/9.AST操作之构造节点信息/decode_obfuscator.js

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+const fs = require('fs');
+const {parse} = require("@babel/parser");
+const traverse = require("@babel/traverse").default;
+const generator = require("@babel/generator").default;
+let encode_file = "./encode.js";
+
+let js_code = fs.readFileSync(encode_file, {encoding: "utf-8"});
+let ast = parse(js_code, {
+    sourceType: 'module',
+});
+
+const visitor = {
+    VariableDeclarator(path) {
+        // 使用解构赋值语法 {} 是用来从对象中提取特定属性或方法
+        const {init} = path.node
+        console.log({init})
+        const node = {
+            type: "BinaryExpression",
+            operator: "+",
+            left: {
+                type: "NumericLiteral",
+                value: 1
+            },
+            right: {
+                type: "NumericLiteral",
+                value: 2
+            }
+        }
+
+        init || path.set("init", node)
+    },
+}
+
+traverse(ast, visitor);
+let {code} = generator(ast);
+console.log(code)

AST抽象语法树/9.AST操作之构造节点信息/encode.js

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+var a;

AST抽象语法树/README.md

@@ -4,3 +4,7 @@
 
 https://blog.csdn.net/weixin_52057903/article/details/129131582
 
+babel文档
+
+https://babeljs.io/docs/babel-types
+