Snobol4 语言 快速去除字符串中的 HTML 实体编码

Snobol4amuwap 发布于 7 天前 6 次阅读

阿木博主一句话概括：Snobol4【1】 语言在去除 HTML 实体编码【2】中的应用与实践

阿木博主为你简单介绍：
HTML 实体编码是网页中用于表示特殊字符的一种方式，但在某些情况下，我们需要从字符串中去除这些编码。Snobol4 是一种古老的编程语言，以其简洁和高效著称。本文将探讨如何使用 Snobol4 语言编写一个高效的程序来去除字符串中的 HTML 实体编码，并分析其实现原理【4】和性能【5】。

关键词：Snobol4；HTML 实体编码；字符串处理【6】；编程语言

一、

HTML 实体编码是一种将特殊字符转换为可传输的字符序列的方法。这些编码在网页中广泛使用，以确保特殊字符在传输过程中不会引起误解。在某些场景下，我们可能需要从字符串中去除这些编码，例如在处理用户输入或进行数据清洗【7】时。

Snobol4 语言因其简洁性和高效性，在处理字符串操作时具有独特的优势。本文将介绍如何使用 Snobol4 语言编写一个程序来去除字符串中的 HTML 实体编码，并分析其实现细节。

二、HTML 实体编码概述

HTML 实体编码通常以“&”开始，以“;”结束。以下是一些常见的 HTML 实体编码示例：

- < 表示小于号（）
- & 表示与号（&）
- " 表示引号（"）
- &xXXXX; 表示十六进制编码【8】的字符（XXXX 为十六进制数）

三、Snobol4 语言简介

Snobol4 是一种高级编程语言，由Ralph E. Griswold于1962年发明。它以其简洁的语法和强大的字符串处理能力而闻名。Snobol4 的设计哲学是“简单性”，它通过使用自然语言的表达方式来简化编程任务。

四、Snobol4 去除 HTML 实体编码的实现

以下是一个使用 Snobol4 语言编写的程序，用于去除字符串中的 HTML 实体编码：

```snobol
:in, :out, :var 'entity_map, 'hex_map

'entity_map = ["<" " " ""]
'entity_map = ["&" " " "&"]
'entity_map = [""" " " """]
'entity_map = ["&x" " " ""]

'hex_map = ["0" "1" "2" "3" "4" "5" "6" "7" "8" "9" "A" "B" "C" "D" "E" "F"]

in: string
out: string

{ string | (
{ char【9】 | (
{ char = "&" | char = "&x" | char = "&" } [
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
}
}
}
}
}
}
}
}
}
}
}

}
]
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (

}
]
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (

}
]
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (

}
]
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (

}
]
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (

}
]
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (

}
]
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (

}
]
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (

}
]
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char | (
{ char = char |