Programmatic approach — a specific parser program is written to parse each message format.

编程方法——编写特定的解析器程序来解析每种消息格式。

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Descriptive approach — You write a single general-purpose model-driven parser program to parse all formats, with each message format represented by its own model.

描述方法——您将编写单个通用的模型驱动的解析器程序来解析所有格式，每种消息格式由各自的模型表示。

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For example, if you have five different COBOL data structures, you write five format-specific parsers, with the format information hard-wired into the parser program code.

例如，如果您有五种不同的COBOL数据结构，您将编写五个特定于格式的解析器，并将格式信息硬编码到解析器程序代码中。

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The disadvantage is lack of flexibility -- you must write a new parser program for each new format, and if a format changes, you must change, recompile, relink, and redeploy the parser program.

缺点在于缺乏灵活性——您必须为每种新的格式编写新的解析器程序，并且如果格式更改，您就必须更改、重新编译、重新链接和重新部署解析器程序。

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Some programs copy parts of themselves into the output for technical reasons — for example, Bison copies a standard parser program into its output file.

一些程序会由于技术原因而拷贝他们的某部分到输出——例如，Bison拷贝一个标准的语法分析程序到它的输出文件。

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Some programs copy parts of themselves into the output for technical reasons — for example, Bison copies a standard parser program into its output file.

一些程序会由于技术原因而拷贝他们的某部分到输出——例如，Bison拷贝一个标准的语法分析程序到它的输出文件。

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