lex.py 文件源码

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

        if getattr(lextab,"_tabversion","0.0") != __version__:
            raise ImportError("Inconsistent PLY version")

        self.lextokens      = lextab._lextokens
        self.lexreflags     = lextab._lexreflags
        self.lexliterals    = lextab._lexliterals
        self.lexstateinfo   = lextab._lexstateinfo
        self.lexstateignore = lextab._lexstateignore
        self.lexstatere     = { }
        self.lexstateretext = { }
        for key,lre in lextab._lexstatere.items():
             titem = []
             txtitem = []
             for i in range(len(lre)):
                  titem.append((re.compile(lre[i][0],lextab._lexreflags | re.VERBOSE),_names_to_funcs(lre[i][1],fdict)))
                  txtitem.append(lre[i][0])
             self.lexstatere[key] = titem
             self.lexstateretext[key] = txtitem
        self.lexstateerrorf = { }
        for key,ef in lextab._lexstateerrorf.items():
             self.lexstateerrorf[key] = fdict[ef]
        self.begin('INITIAL')

    # ------------------------------------------------------------
    # input() - Push a new string into the lexer
    # ------------------------------------------------------------