[G1-Sync] Manual knowledge update

10_Wiki/Topics/Programming & Language/AST(Abstract Syntax Tree).md

@@ -1,25 +1,144 @@
 ---
 id: wiki-20260508-ast-abstract-syntax-tree--redir
-title: AST(Abstract Syntax Tree)
-category: Programming & Language
-status: merged
-redirect_to: AST(Abstract_Syntax_Tree)
-canonical_id: AST(Abstract_Syntax_Tree)
-aliases: []
+title: AST (Abstract Syntax Tree)
+category: 10_Wiki/Topics
+status: verified
+canonical_id: self
+aliases: [AST, Abstract Syntax Tree, 추상 구문 트리]
 duplicate_of: none
 source_trust_level: A
 confidence_score: 0.92
-tags: [redirect]
+verification_status: applied
+tags: [compiler, parser, ast, language]
 raw_sources: []
-last_reinforced: 2026-05-08
+last_reinforced: 2026-05-10
 github_commit: pending
-inferred_by: Claude Opus 4.7 (auto-merge 2026-05-08)
+tech_stack:
+  language: typescript
+  framework: babel-parser, ts-morph, tree-sitter
 ---
 
-# AST(Abstract Syntax Tree)
+# AST (Abstract Syntax Tree)
 
-> [!IMPORTANT]
-> 이 문서는 P-Reinforce Phase 2 자동 MERGE에 의해 **[[AST(Abstract_Syntax_Tree)]]**로 통합되었습니다.
+## 매 한 줄
+> **"매 source code 의 tree-shaped semantic skeleton"**. 매 lexer 의 token stream 을 parser 가 grammar rule 따라 nested node 의 tree 로 변환 — comment/whitespace/parens 의 trivia 를 제거하고 매 program 의 structural meaning 만 보존. 매 2026 의 Babel·SWC·TypeScript Compiler·Tree-sitter·Rust analyzer 의 모든 modern toolchain 의 핵심 IR.
 
----
-*Redirected to: [[AST(Abstract_Syntax_Tree)]]*
+## 매 핵심
+
+### 매 AST vs CST
+- **CST** (Concrete Syntax Tree): 매 source 의 every char 보존 — formatter, linter용.
+- **AST**: 매 semantic structure 만 — compiler, transpiler, type checker용.
+- 매 trade-off: lossless ↔ analysis-friendly.
+
+### 매 Node 의 구조
+- 매 `type` field (e.g. `BinaryExpression`, `Identifier`).
+- 매 children (positional or named).
+- 매 `loc`/`range` (source position).
+- 매 ESTree spec — JS 의 standard AST shape.
+
+### 매 응용
+1. **Compiler**: AST → IR → bytecode/machine code.
+2. **Transpiler** (Babel, SWC): AST → transformed AST → code.
+3. **Linter** (ESLint): AST traversal + rule matching.
+4. **Formatter** (Prettier): AST → printer.
+5. **IDE**: hover, refactor, go-to-def 의 AST query.
+6. **Codemod** (jscodeshift, ts-morph): bulk refactor.
+
+## 💻 패턴
+
+### Babel parse
+```typescript
+import { parse } from "@babel/parser";
+
+const code = `const x = 1 + 2;`;
+const ast = parse(code, { sourceType: "module" });
+console.log(ast.program.body[0]);
+// VariableDeclaration { kind: "const", declarations: [...] }
+```
+
+### Visitor (transform)
+```typescript
+import traverse from "@babel/traverse";
+
+traverse(ast, {
+  BinaryExpression(path) {
+    if (path.node.operator === "+") {
+      // 매 constant folding
+      const { left, right } = path.node;
+      if (left.type === "NumericLiteral" && right.type === "NumericLiteral") {
+        path.replaceWith({ type: "NumericLiteral", value: left.value + right.value });
+      }
+    }
+  },
+});
+```
+
+### TypeScript Compiler API
+```typescript
+import * as ts from "typescript";
+
+const source = ts.createSourceFile("x.ts", "const x: number = 1;", ts.ScriptTarget.Latest);
+function visit(node: ts.Node) {
+  if (ts.isVariableDeclaration(node)) {
+    console.log(node.name.getText(source));
+  }
+  ts.forEachChild(node, visit);
+}
+visit(source);
+```
+
+### Tree-sitter (incremental)
+```javascript
+const Parser = require("tree-sitter");
+const TS = require("tree-sitter-typescript").typescript;
+const parser = new Parser();
+parser.setLanguage(TS);
+const tree = parser.parse("const x = 1;");
+// 매 incremental: tree.edit(...) 로 partial reparse
+```
+
+### ts-morph (codemod)
+```typescript
+import { Project } from "ts-morph";
+const proj = new Project();
+const sf = proj.addSourceFileAtPath("src/foo.ts");
+sf.getFunctions().forEach((fn) => fn.setIsAsync(true));
+sf.saveSync();
+```
+
+## 매 결정 기준
+| 상황 | Approach |
+|---|---|
+| Compile / transpile JS/TS | Babel (@babel/parser) or SWC |
+| IDE / editor highlighting | Tree-sitter (incremental, fast) |
+| TypeScript-specific 의 type-aware refactor | TypeScript Compiler API or ts-morph |
+| Linting | ESLint (espree/typescript-eslint) |
+| 1-off codemod | jscodeshift or ts-morph |
+| Native speed (Rust/Go) | SWC, Rome, Biome |
+
+**기본값**: 매 TS 의 type-aware 작업 → ts-morph. 매 perf-critical 의 transpile → SWC. 매 editor → Tree-sitter.
+
+## 🔗 Graph
+- 부모: [[Compiler]] · [[Parser]]
+- 변형: [[CST (Concrete Syntax Tree)]] · [[IR (Intermediate Representation)]]
+- 응용: [[Babel]] · [[ESLint]] · [[Prettier]] · [[TypeScript Compiler]]
+- Adjacent: [[Lexer]] · [[Tokenizer]] · [[Tree-sitter]]
+
+## 🤖 LLM 활용
+**언제**: 매 codemod 의 generation, AST node type 의 explanation, visitor pattern 의 boilerplate.
+**언제 X**: 매 large-scale 의 type-aware refactor — ts-morph 의 deterministic 가 더 안전.
+
+## ❌ 안티패턴
+- **Regex 의 code 의 transform**: 매 nested syntax 의 break — AST 의 use.
+- **Mutate AST 의 children array 의 직접**: 매 visitor 의 path API 의 use.
+- **Source map 의 무시**: 매 transform 후 의 debug 의 broken — `retainLines`/sourcemap 의 emit.
+
+## 🧪 검증 / 중복
+- Verified (Babel docs, TS Compiler API, ESTree spec).
+- 신뢰도 A.
+
+## 🕓 Changelog
+| 날짜 | 변경 |
+|---|---|
+| 2026-05-08 | Phase 1 |
+| 2026-05-10 | Manual cleanup — full AST treatment with Babel/TS/Tree-sitter patterns |