From 85fb42e72b7196d3830b9bd28c08058f63278de1 Mon Sep 17 00:00:00 2001
From: aiyingfeng <aiyingfeng110@qq.com>
Date: Tue, 22 Aug 2023 12:20:08 +0800
Subject: [PATCH] =?UTF-8?q?12.AST=E6=93=8D=E4=BD=9C=E4=B9=8B=E5=A6=82?=
 =?UTF-8?q?=E4=BD=95=E6=8F=92=E5=85=A5=E8=8A=82=E7=82=B9-insertAfter-inser?=
 =?UTF-8?q?tBefore?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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---
 .../README.md                                 | 36 +++++++++++++++++++
 .../decode_obfuscator.js                      | 30 ++++++++++++++++
 .../encode.js                                 |  1 +
 3 files changed, 67 insertions(+)
 create mode 100644 AST抽象语法树/12.AST操作之如何插入节点-insertAfter-insertBefore/README.md
 create mode 100644 AST抽象语法树/12.AST操作之如何插入节点-insertAfter-insertBefore/decode_obfuscator.js
 create mode 100644 AST抽象语法树/12.AST操作之如何插入节点-insertAfter-insertBefore/encode.js

diff --git a/AST抽象语法树/12.AST操作之如何插入节点-insertAfter-insertBefore/README.md b/AST抽象语法树/12.AST操作之如何插入节点-insertAfter-insertBefore/README.md
new file mode 100644
index 0000000..cfceaab
--- /dev/null
+++ b/AST抽象语法树/12.AST操作之如何插入节点-insertAfter-insertBefore/README.md
@@ -0,0 +1,36 @@
+# AST操作之如何插入节点
+
+需求：var a = 123;后面增加一个兄弟节点b = 111
+
+```javascript
+const fs = require('fs');
+const {parse} = require("@babel/parser");
+const traverse = require("@babel/traverse").default;
+const generator = require("@babel/generator").default;
+const t = require('@babel/types');
+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) {
+        let {id} = path.node;
+        // 这里一定要判断准确，否则会无限循环
+        if(id.name == 'a'){
+            let new_id = t.Identifier("b");
+            let new_init = t.NumericLiteral(111);
+            let new_node = t.VariableDeclarator(new_id, new_init);
+            path.insertAfter(new_node)
+        }
+    },
+};
+
+traverse(ast, visitor);
+
+// 将修改后的AST重新生成为代码
+const modifiedCode = generator(ast).code;
+console.log(modifiedCode);
+```
\ No newline at end of file
diff --git a/AST抽象语法树/12.AST操作之如何插入节点-insertAfter-insertBefore/decode_obfuscator.js b/AST抽象语法树/12.AST操作之如何插入节点-insertAfter-insertBefore/decode_obfuscator.js
new file mode 100644
index 0000000..9d5970e
--- /dev/null
+++ b/AST抽象语法树/12.AST操作之如何插入节点-insertAfter-insertBefore/decode_obfuscator.js
@@ -0,0 +1,30 @@
+const fs = require('fs');
+const {parse} = require("@babel/parser");
+const traverse = require("@babel/traverse").default;
+const generator = require("@babel/generator").default;
+const t = require('@babel/types');
+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) {
+        let {id} = path.node;
+        // 这里一定要判断准确，否则会无限循环
+        if(id.name == 'a'){
+            let new_id = t.Identifier("b");
+            let new_init = t.NumericLiteral(111);
+            let new_node = t.VariableDeclarator(new_id, new_init);
+            path.insertAfter(new_node)
+        }
+    },
+};
+
+traverse(ast, visitor);
+
+// 将修改后的AST重新生成为代码
+const modifiedCode = generator(ast).code;
+console.log(modifiedCode);
\ No newline at end of file
diff --git a/AST抽象语法树/12.AST操作之如何插入节点-insertAfter-insertBefore/encode.js b/AST抽象语法树/12.AST操作之如何插入节点-insertAfter-insertBefore/encode.js
new file mode 100644
index 0000000..9d69cb3
--- /dev/null
+++ b/AST抽象语法树/12.AST操作之如何插入节点-insertAfter-insertBefore/encode.js
@@ -0,0 +1 @@
+var a = 123;
\ No newline at end of file