Snobol4【1】 语言实战：全角特殊字符转换实战
Snobol4 是一种古老的编程语言，最初由Ralph E. Griswold在1962年设计。它以其简洁的语法和强大的字符串处理能力而闻名。本文将围绕Snobol4语言，通过一个实战案例——全角特殊字符转换，来展示Snobol4在字符串处理方面的强大功能。
Snobol4 简介
Snobol4 是 Snobol（StriNg OBjects and symBols）语言的第四个版本，它是一种高级编程语言，特别适合于文本处理和字符串操作。Snobol4 的语法简洁，易于理解，但同时也具有一些独特的特性，如模式匹配【2】和字符串替换【3】。
实战案例：全角特殊字符转换
1. 问题背景
在处理中文字符时，我们经常需要将全角字符【4】转换为半角字符【5】，或者将半角字符转换为全角字符。全角字符和半角字符的区别在于它们的编码范围【6】。全角字符通常用于显示在文档中，而半角字符则用于编程和文本编辑。
2. 解决方案
在Snobol4中，我们可以使用模式匹配和替换功能来实现全角特殊字符的转换。以下是一个简单的Snobol4程序，用于将全角特殊字符转换为半角字符。
```snobol
:input
input:line
output:line
定义全角字符到半角字符的映射
fullwidth:table
'！' '1'
'＂' '2'
'＃' '3'
'＄' '4'
'％' '5'
'＆' '6'
'＇' '7'
'（' '('
'）' ')'
'＊' ''
'＋' '+'
'，' ','
'－' '-'
'．' '.'
'／' '/'
'：' ':'
'；' ';'
'＜' ''
'？' '?'
'＠' '@'
'［' '['
'＼' ''
'］' ']'
'＾' '^'
'＿' '_'
'｀' '`'
'｛' '{'
'｜' '|'
'｝' '}'
'～' '~'
转换函数
to_halfwidth
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