什么是魔术逃亡（\\）字符背后 [英] What's the Magic Behind Escape(\) Character

问题描述

如何在C / C ++编译器操纵源$ C ​​$ C转义字符[\\]？如何编译器的语法来处理这​​个角色写的？什么是编译器遇到此字符后怎么办？

How does the C/C++ compiler manipulate the escape character ["\"] in source code? How is compiler grammar written for processing that character? What does the compiler do after encountering that character?

推荐答案

大多数编译器分为部分：编译器前端被称为的词法分析器或扫描仪。编译器的这部分读取实际的字符并创建令牌。它有一个状态机，它决定，在看到一个转义字符，是否是正品（例如，当它出现在字符串中），或者修改一个字符。令牌是输出相应的转义字符或其他一些标记（如标签或换行）编译器的下一个部分（解析器）。状态机可以组几个字符到一个令牌。

Most compilers are divided into parts: the compiler front-end is called a lexical analyzer or a scanner. This part of the compiler reads the actual characters and creates tokens. It has a state machine which decides, upon seeing an escape character, whether it is genuine (for example when it appears inside a string) or it modifies the next character. The token is output accordingly as the escape character or some other token (such as a tab or a newline) to the next part of the compiler (the parser). The state machine can group several characters into a token.

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