node_visitor.py 文件源码

def generic_visit(self, node, phase=None):
        """Drive the visitor."""
        phase = phase or constants.PRIMARY
        for _, value in ast.iter_fields(node):
            if isinstance(value, list):
                for item in value:
                    if not isinstance(item, ast.AST):
                        continue
                    if not self.pre_visit(item):
                        continue
                    self.visit(item, phase=phase)
                    self.generic_visit(item, phase=phase)
                    self.post_visit(item)

            elif isinstance(value, ast.AST):
                if not self.pre_visit(value):
                    continue
                self.visit(value, phase=phase)
                self.generic_visit(value, phase=phase)
                self.post_visit(value)