如果你敲累了代碼，想喝喝咖啡，順便看點兒可以當佐料的文章那本文應該比較適合現在的你。(?????)? ??

我們一天天都在和代碼打交道，但是你了解代碼的運行原理麽？為什麽你的一行代碼就能被執行出五花八門的效果嘞？

其實代碼這玩意兒就是一門語言。是的，你可以看成和中文、英文等語言平等的存在。是語言就得有語言的解析規則，不懂得規則自然無法理解語言的意思。就跟看沒字幕的美劇一樣，真是痛苦。╮(╯﹏╰)╭

中文有中文的語義、語法、句子、句法、文法，那麽編程語言也有自己的語言系統。

我們知道，我們寫的代碼被編譯器或者解釋器所執行，那它們是按照什麽文法來理解你的代碼呢？這就是文法。

本文也不會深入去解析文法，不然可以直接轉語言學了（笑~）。本文只是簡單介紹文法的一些概念。如果您喝著咖啡，看完之後，能有些許收獲，微微一笑，那本文的目的也就達到了。^_^

工欲善其事必先利其器。在談文法之前，我們先介紹幾個概念。

一.文法涉及的幾個簡單概念

假設Σ是一個有限的字母表集合，它的每一元素都是一個符號。Σ上的一個符號串就是指由Σ中的符號組成的一個有限序列。如果一個符號串不包含任何符號，就叫它空串，記為ε。現在再定義一個集合U和V的連接積的概念：

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很簡單的概念，是不是？