It used to be that using multiple parsers within a single program required a fair amount of careful tuning of the files generated by lex and yacc.
以前，在一个程序中使用多个解析器时，需要非常小心地调整lex和yacc生成的文件。
Here's a simple example of a program that can be written in a page of yacc and a half-page of lex code.
这里是一个简单的示例程序，只需要一页yacc代码和半页lex代码就可以编写完该程序。
Some users have reported that the discipline of formulating valid Yacc specifications for their input revealed errors of conception or design early in the program development.
一些用户报告说，对他们的输入构造合法的Yacc规范结构的过程让他们程序设计中的概念错误提早显露了出来。
Yacc provides a general tool for imposing structure on the input to a computer program.
Yacc提供了一个通用工具来识别程序输入的结构。
Yacc provides a general tool for imposing structure on the input to a computer program.
Yacc提供了一个通用工具来识别程序输入的结构。
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