parser.py 文件源码

def parse_try_expr(self):
        expr = ast.TryExpression(self.cur_tok, None, None, None)

        if not self.expect(token.LBRACE):
            return None

        expr.body = self.parse_block_statement()

        if not self.expect(token.CATCH):
            return None

        if not self.expect(token.LPAREN):
            return None

        self.next()
        expr.err_name = self.parse_id(False)

        if not self.expect(token.RPAREN):
            return None

        if not self.expect(token.LBRACE):
            return None

        expr.arms = self.parse_match_arms()

        return expr