import ast class CodeVisitor(ast.NodeVisitor): def visit_BinOp(self, node): if isinstance(node.op, ast.Add): node.op = ast.Sub() self.generic_visit(node) py_src = \ """ def MyAdd(x, y): return x + y print(add(3, 5)) """ r_node = ast.parse(py_src) visitor = CodeVisi...
"""# 解析为ASTtree=ast.parse(code)# 修改ASTclassAddToSubtract(ast.NodeTransformer):defvisit_Compare(self,node):# 示例:将所有的加法替换为减法ifisinstance(node.ops[0],ast.Add):node.ops[0]=ast.Sub()returnnode transformer=AddToSubtract()modified_tree=transformer.visit(tree)# 生成新的代码new_c...
语法树中的每个节点都对应ast下的一种类型,根节点是ast.Moudle类型,在分析的时候可以通过isinstance函数方便的进行节点类型的判断。 ast中存在的节点的所有类型可以参考:ast节点类型 比如a = 10这样一条语句对应ast.Assign节点类型,而Assign节点类型分别有两个子节点, 分别为ast.Name类型的a和ast.Num类型的10等。 ...
1classCodeVisitor(ast.NodeVisitor):2defvisit_BinOp(self,node):3ifisinstance(node.op,ast.Add):4node.op=ast.Sub()5self.generic_visit(node)67defvisit_FunctionDef(self,node):8print'Function Name:%s'%node.name9self.generic_visit(node)10func_log_stmt=ast.Print(11dest=None,12values=[ast.Str(...
ast.NodeVisitor.generic_visit(self, node) 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 如上述代码,定义类CodeVisitor,继承自NodeVisitor,这里面主要有两种类型的函数,一种的generic_visit,一种是"visit_" + "Node类型"。 visitor首先从根节点root进行遍历,在遍历的过程中,假设节点类型为Assign,如果...
code_node = ast.parse(code) astpretty.pprint(code_node) instaviz.show(func) 打印出来的AST结构 Module( body=[ FunctionDef( lineno=1, col_offset=0, name='func', args=arguments(args=[], vararg=None, kwonlyargs=[], kw_defaults=[], kwarg=None, defaults=[]), ...
ast.parse(可以直接查看ast模块的源代码)方法实际上是调用内置函数compile进行编译,如下所示: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 defparse(source,filename='<unknown>',mode='exec'):""" Parse the source into anASTnode.Equivalent tocompile(source,filename,mode,PyCF_ONLY_AST)."""retur...
Look at the source code and compare the visual AST syntax tree online at the same time. You can be patient and analyze it layer by layer. The cases in this article are only the most basic operations. It has to be modified according to the situation, for example, some type judgments ...
("@babel/traverse").default const code = ` const a = 1; const b = a * 2; const c = 2; const d = b + 1; const e = 3; console.log(d) ` const ast = parser.parse(code) const visitor = { VariableDeclarator(path){ const binding = path.scope.getBinding(path.node.id.name)...
Refactor code to enforce a certain style, such as reordering function definitions. Safely migrate code from one API to another. Design Goals Symmetry: Given any input source, it should hold thatpasta.dump(pasta.parse(src)) == src. Mutability: Any changes made in the AST are reflected in th...