我正在尝试使用带有访问者的 pycparser 为每个 IF 语句解析 C 代码。根据我的观察,它只访问没有嵌套 IF 的顶级节点。是故意的,还是我的代码有问题?
最佳答案
查看类(class)评论:https://github.com/eliben/pycparser/blob/master/pycparser/c_ast.py#L107
The children of nodes for which a visit_XXX was defined will not be visited - if you need this, call generic_visit() on the node.
You can use:
NodeVisitor.generic_visit(self, node)
我试过了,它对我有用:
if_conditions.py
from __future__ import print_function
import sys
# This is not required if you've installed pycparser into
# your site-packages/ with setup.py
sys.path.extend(['.', '..'])
from pycparser import c_parser, c_ast, parse_file
class IfVisitor(c_ast.NodeVisitor):
def __init__(self):
pass
def visit_If(self, node):
node.show()
self.generic_visit(node);
def start(filename):
ast = parse_file(filename, use_cpp=True)
v = IfVisitor()
v.visit(ast)
if __name__ == "__main__":
if len(sys.argv) > 2:
filename = sys.argv[1]
else:
filename = 'examples/c_files/test.c'
start(filename)
测试.c
main ( int arc, char **argv ) {
int i = 1;
if (i > 1) {
if (i > 2) {
printf("Yay!");
}
}
// code
return 0; // Indicates that everything vent well.
}
关于python - pycparser 嵌套节点访问者,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/33668210/