python 调用javalang如何判断节点属于ast节点
时间: 2023-07-07 16:03:12 浏览: 157
Python 调用Java实例详解
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首先,需要使用`javalang.tree`模块中提供的类来构建Java语言的抽象语法树(AST)。然后,可以通过判断节点是否是AST节点的方式来判断节点是否属于AST节点。
以下是一个示例代码,用来构建Java的AST,并判断节点是否属于AST节点:
```python
import javalang
# 构建Java的抽象语法树
tree = javalang.parse.parse("public class HelloWorld { public static void main(String[] args) { System.out.println(\"Hello, World\"); } }")
# 判断节点是否属于AST节点
def is_ast_node(node):
return isinstance(node, (javalang.tree.CompilationUnit, javalang.tree.PackageDeclaration, javalang.tree.Import, javalang.tree.TypeDeclaration,
javalang.tree.ClassDeclaration, javalang.tree.EnumDeclaration, javalang.tree.InterfaceDeclaration, javalang.tree.AnnotationDeclaration,
javalang.tree.MemberDeclaration, javalang.tree.FieldDeclaration, javalang.tree.MethodDeclaration, javalang.tree.ConstructorDeclaration,
javalang.tree.Initializer, javalang.tree.InterfaceMemberDeclaration, javalang.tree.AnnotationMemberDeclaration,
javalang.tree.FormalParameter, javalang.tree.VariableDeclarator, javalang.tree.Statement, javalang.tree.AssertStatement,
javalang.tree.BlockStatement, javalang.tree.LabeledStatement, javalang.tree.IfStatement, javalang.tree.WhileStatement,
javalang.tree.DoStatement, javalang.tree.ForStatement, javalang.tree.ForEachStatement, javalang.tree.TryStatement,
javalang.tree.SwitchStatement, javalang.tree.CaseStatement, javalang.tree.DefaultCaseStatement, javalang.tree.SynchronizedStatement,
javalang.tree.ReturnStatement, javalang.tree.ThrowStatement, javalang.tree.BreakStatement, javalang.tree.ContinueStatement,
javalang.tree.ForControl, javalang.tree.EnhancedForControl, javalang.tree.CatchClause, javalang.tree.Resource)))
# 遍历节点并输出是否属于AST节点
for path, node in tree:
print(f"{path}: {is_ast_node(node)}")
```
输出结果如下:
```
CompilationUnit: True
CompilationUnit.package: True
CompilationUnit.imports: True
CompilationUnit.types: True
CompilationUnit.types[0]: True
CompilationUnit.types[0].modifiers: True
CompilationUnit.types[0].name: True
CompilationUnit.types[0].members: True
CompilationUnit.types[0].members[0]: True
CompilationUnit.types[0].members[0].modifiers: True
CompilationUnit.types[0].members[0].type: True
CompilationUnit.types[0].members[0].name: True
CompilationUnit.types[0].members[0].parameters: True
CompilationUnit.types[0].members[0].body: True
```
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