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Code AST Tool - Parse Python source thành AST bằng stdlib `ast`.
Author: Hieu Louis (2026)
Operations:
- dump_tree : Dump toàn bộ AST tree (ast.dump indent=2)
- list_functions : Liệt kê FunctionDef / AsyncFunctionDef
- list_classes : Liệt kê ClassDef + methods
- list_imports : Liệt kê Import / ImportFrom
- list_calls : Liệt kê Call sites
Tool read-only (SAFE). Trả về JSON summary trong `output`.
"""
from __future__ import annotations
import ast
import json
from typing import Any, Dict, List, Optional, Tuple
from .base import Tool, ToolResult, ToolContext, ToolCategory, ToolSafety
# Các operation được hỗ trợ // supported operations
OPERATIONS = {
"dump_tree",
"list_functions",
"list_classes",
"list_imports",
"list_calls",
}
def _load_code(args: Dict[str, Any]) -> Tuple[Optional[str], Optional[str]]:
"""Load source từ `path` hoặc `code`. Trả về (code, error)."""
path = args.get("path")
code = args.get("code")
if not path and not code:
return None, "Missing required arg: path hoặc code"
if path:
try:
with open(path, "r", encoding="utf-8") as f:
return f.read(), None
except Exception as e:
return None, f"Không đọc được file {path}: {e}"
return code, None
class CodeASTTool(Tool):
"""Parse Python source thành AST và trả về summary theo operation."""
category = ToolCategory.CODE
safety = ToolSafety.SAFE # read-only analysis
@property
def name(self) -> str:
return "code_ast"
@property
def description(self) -> str:
return (
"Parse Python source thành AST. Hỗ trợ dump_tree, list_functions, "
"list_classes, list_imports, list_calls. Trả về JSON summary."
)
@property
def parameters(self) -> Dict[str, Any]:
return {
"type": "object",
"properties": {
"path": {"type": "string", "description": "Đường dẫn file Python (.py)"},
"code": {"type": "string", "description": "Mã nguồn Python (nếu không dùng path)"},
"operation": {
"type": "string",
"enum": sorted(OPERATIONS),
"description": "Operation (default list_functions)",
},
},
"anyOf": [{"required": ["path"]}, {"required": ["code"]}],
}
def validate_args(self, args: Dict[str, Any]) -> Optional[str]:
op = args.get("operation", "list_functions")
if op not in OPERATIONS:
return f"Unsupported operation: {op}. Chọn một trong: {sorted(OPERATIONS)}"
if not args.get("path") and not args.get("code"):
return "Missing required arg: path hoặc code"
return None
def execute(self, args: Dict[str, Any], context: ToolContext) -> ToolResult:
code, err = _load_code(args)
if err:
return ToolResult(success=False, error=err, return_code=1)
op = args.get("operation", "list_functions")
try:
tree = ast.parse(code)
except SyntaxError as e:
return ToolResult(
success=False,
error=f"SyntaxError (line {e.lineno}): {e.msg}",
return_code=1,
metadata={"path": args.get("path")},
)
try:
if op == "dump_tree":
dump = ast.dump(tree, indent=2)
node_count = sum(1 for _ in ast.walk(tree))
return ToolResult(
success=True,
output=dump,
metadata={
"operation": op,
"path": args.get("path"),
"nodes": node_count,
},
)
if op == "list_functions":
items: List[Dict[str, Any]] = []
for n in ast.walk(tree):
if isinstance(n, (ast.FunctionDef, ast.AsyncFunctionDef)):
items.append({
"name": n.name,
"line": n.lineno,
"end_line": getattr(n, "end_lineno", n.lineno),
"args": [a.arg for a in n.args.args],
"decorators": [ast.unparse(d) for d in n.decorator_list],
"is_async": isinstance(n, ast.AsyncFunctionDef),
})
elif op == "list_classes":
items = []
for n in ast.walk(tree):
if isinstance(n, ast.ClassDef):
methods = [
m.name for m in n.body
if isinstance(m, (ast.FunctionDef, ast.AsyncFunctionDef))
]
items.append({
"name": n.name,
"line": n.lineno,
"end_line": getattr(n, "end_lineno", n.lineno),
"bases": [ast.unparse(b) for b in n.bases],
"methods": methods,
"decorators": [ast.unparse(d) for d in n.decorator_list],
})
elif op == "list_imports":
items = []
for n in ast.walk(tree):
if isinstance(n, ast.Import):
for alias in n.names:
items.append({
"line": n.lineno,
"module": alias.name,
"alias": alias.asname,
"type": "import",
})
elif isinstance(n, ast.ImportFrom):
mod = "." * (n.level or 0) + (n.module or "")
for alias in n.names:
items.append({
"line": n.lineno,
"module": mod,
"name": alias.name,
"alias": alias.asname,
"type": "from",
})
elif op == "list_calls":
items = []
for n in ast.walk(tree):
if isinstance(n, ast.Call):
try:
func_repr = ast.unparse(n.func)
except Exception:
func_repr = "<unknown>"
items.append({"line": n.lineno, "func": func_repr})
else:
return ToolResult(success=False, error=f"Unknown operation: {op}", return_code=1)
return ToolResult(
success=True,
output=json.dumps(items, indent=2, ensure_ascii=False),
metadata={
"operation": op,
"path": args.get("path"),
"count": len(items),
},
)
except Exception as e:
return ToolResult(
success=False,
error=f"{type(e).__name__}: {e}",
return_code=1,
)
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