yacc.py 文件源码

def read_table(self,module):
        if isinstance(module,types.ModuleType):
            parsetab = module
        else:
            if sys.version_info[0] < 3:
                exec("import %s as parsetab" % module)
            else:
                env = { }
                exec("import %s as parsetab" % module, env, env)
                parsetab = env['parsetab']

        if parsetab._tabversion != __tabversion__:
            raise VersionError("yacc table file version is out of date")

        self.lr_action = parsetab._lr_action
        self.lr_goto = parsetab._lr_goto

        self.lr_productions = []
        for p in parsetab._lr_productions:
            self.lr_productions.append(MiniProduction(*p))

        self.lr_method = parsetab._lr_method
        return parsetab._lr_signature