Snobol4 语言 文本处理实战 批量转换英文大小写

Snobol4amuwap 发布于 8 天前 7 次阅读

Snobol4【1】 语言文本处理实战：批量转换【2】英文大小写

Snobol4 是一种古老的编程语言，最初在1962年由David J. Farber、Ralph E. Griswold 和 Ivan P. Polonsky 在贝尔实验室【3】开发。尽管它已经不再流行，但Snobol4 在文本处理方面有着独特的优势。本文将探讨如何使用Snobol4 语言进行批量转换英文大小写，并通过实际案例展示其文本处理能力。

Snobol4 简介

Snobol4 是一种基于字符串的编程语言，特别适合于文本处理任务。它具有以下特点：

- 字符串处理【4】能力：Snobol4 提供了丰富的字符串操作函数，如大小写转换、字符串拼接、搜索和替换等。
- 模式匹配【5】：Snobol4 支持模式匹配，可以方便地处理文本中的特定模式。
- 简洁的表达式：Snobol4 的语法简洁，易于编写和理解。

批量转换英文大小写

在英文文本处理中，大小写转换是一个常见的任务。以下是一个使用Snobol4 实现的批量转换英文大小写的示例。

示例代码

```snobol
:upper
'A' 'Z' DO
!UPCASE【6】 !PUT
EN
!NEWLINE
;

:lower
'a' 'z' DO
!LOWCASE【7】 !PUT
EN
!NEWLINE
;

:main
'input.txt' OPEN IN
'output.txt' OPEN OUT
DO
!GET
IF !EMPTY THEN
!CLOSE OUT
!CLOSE IN
EXIT
END
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