在 前文 以及 参考文章1、参考文章2 的基础上,继续分析以及 Demo 演示
| ast.py |
|---|
| class MetaNode(type) |
| class Node(object) |
| def walk_tree(root) |
| def dump(ast, file) |
| def load(file) |
- Node.__ iter__ 即 javalang.ast.walk_tree(Node)
- 简单的持久化由 pickle 库提供的 dump 和 load 实现。
import pickle
def dump(ast, file):
pickle.dump(ast, file)
def load(file):
return pickle.load(file)
抽象语法树 DEMO
示例 Java 代码
#Test.java
public class Clazz{
private static DateFormat format = new SimpleDateFormat("yyyy/MM/dd");
public Date method(String date){
return format.parse(date);
}
}
import javalang
f = open("Test.java", "r")
tree = javalang.parse.parse(f.read())
for path, node in tree:
print(path, node)
for path, node in tree:
print(node)
#直接获取类名
#print(node.__class__.__name__)
# filter 过滤
print(type(tree.filter(javalang.tree.Declaration)), tree.filter(javalang.tree.Declaration))
for path, node in tree.filter(javalang.tree.Declaration):
print(node)
# __init__ 初始化
print(type(tree.__init__(imports="csdn.Attribute47.com")), tree)
# children 返回子信息list
print(type(tree.children), tree.children)
# __repr__ 转换为str
print(type(tree.__repr__()), tree.__repr__())
# __equals__ 相同判断
print(type(tree.__equals__(tree)), tree.__equals__(tree))
# __iter__ 返回walk_tree
print(type(tree.__iter__()), tree.__iter__())
#省略节点内参数
() CompilationUnit()
(CompilationUnit(), [ClassDeclaration()]) ClassDeclaration()
(CompilationUnit(), [ClassDeclaration()], ClassDeclaration(), [FieldDeclaration(), MethodDeclaration()]) FieldDeclaration()
(CompilationUnit(), [ClassDeclaration()], ClassDeclaration(), [FieldDeclaration(), MethodDeclaration()], FieldDeclaration()) ReferenceType()
(CompilationUnit(), [ClassDeclaration()], ClassDeclaration(), [FieldDeclaration(), MethodDeclaration()], FieldDeclaration(), [VariableDeclarator()]) VariableDeclarator()
(CompilationUnit(), [ClassDeclaration()], ClassDeclaration(), [FieldDeclaration(), MethodDeclaration()], FieldDeclaration(), [VariableDeclarator()], VariableDeclarator()) ClassCreator())
(CompilationUnit(), [ClassDeclaration()], ClassDeclaration(), [FieldDeclaration(), MethodDeclaration()], FieldDeclaration(), [VariableDeclarator()], VariableDeclarator(), ClassCreator())) ReferenceType()
(CompilationUnit(), [ClassDeclaration()], ClassDeclaration(), [FieldDeclaration(), MethodDeclaration()], FieldDeclaration(), [VariableDeclarator()], VariableDeclarator(), ClassCreator()), [Literal()]) Literal()
(CompilationUnit(), [ClassDeclaration()], ClassDeclaration(), [FieldDeclaration(), MethodDeclaration()]) MethodDeclaration()
(CompilationUnit(), [ClassDeclaration()], ClassDeclaration(), [FieldDeclaration(), MethodDeclaration()

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