https://blog.youkuaiyun.com/b00140045zh-cnhttps://blog.youkuaiyun.com/https://blog.youkuaiyun.com/b00140045/article/details/44457853https://blog.youkuaiyun.com/b00140045/article/details/44457853b00140045Thu, 19 Mar 2015 14:48:34 +0800https://blog.youkuaiyun.com/b00140045/article/details/44154591https://blog.youkuaiyun.com/b00140045/article/details/44154591b00140045Mon, 09 Mar 2015 14:30:46 +0800 是非终结符，而表达式由一个符号序列，或用指示选择的竖杠 '|' 分隔的多个符号序列构成，每个符号序列整体都是左端的符号的一种可能的替代。从未在左端出现的符号叫做终结符。 基本原理       BNF类似一种数学游戏：从一个符号开始（叫做起始标志，实例中常用S表示），然后给出替换前面符号的规则。BNF]]>https://blog.youkuaiyun.com/b00140045/article/details/44080153https://blog.youkuaiyun.com/b00140045/article/details/44080153b00140045Thu, 05 Mar 2015 11:18:09 +0800https://blog.youkuaiyun.com/b00140045/article/details/44077693https://blog.youkuaiyun.com/b00140045/article/details/44077693b00140045Thu, 05 Mar 2015 08:58:17 +0800https://blog.youkuaiyun.com/b00140045/article/details/44057153https://blog.youkuaiyun.com/b00140045/article/details/44057153b00140045Wed, 04 Mar 2015 10:47:29 +0800