Snobol4【1】 语言实战：HTML【3】 图像数据转 Base64【4】 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。尽管Snobol4在现代编程中并不常见，但了解和学习它可以帮助我们更好地理解编程语言的历史和基础。本文将围绕Snobol4语言，通过一个实际的例子——HTML图像数据转Base64，来展示如何使用Snobol4进行数据处理。
Snobol4 简介
Snobol4是一种高级编程语言，特别适合于文本处理和字符串操作。它的语法简洁，易于理解，但同时也具有一些独特的特性，如模式匹配【5】和上下文无关文法【6】。Snobol4的执行环境【7】通常称为“Snobol4解释器【8】”。
实战目标
我们的目标是使用Snobol4编写一个程序，该程序能够读取HTML文件中的图像数据，并将其转换为Base64编码的字符串。
实战步骤
步骤 1：安装 Snobol4 解释器
我们需要安装Snobol4解释器。由于Snobol4已经是一个较老的编程语言，可能需要从第三方源【9】安装。以下是在Unix-like系统【10】上安装Snobol4的一个示例命令：
sh
sudo apt-get install snobol4
步骤 2：编写 snobol【2】4 程序
接下来，我们将编写一个Snobol4程序，该程序能够读取HTML文件，找到图像数据，并将其转换为Base64编码。
以下是一个简单的Snobol4程序示例：
```snobol
:read【11】 htmlfile【12】
:open【13】 read htmlfile
:while
:read line【14】
:if line = ""
:while
:read char【15】
:if char = " "
:while
:read char
:if char = "d"
:read char
:if char = "a"
:read char
:if char = "t"
:read char
:if char = "a"
:read char
:if char = "s"
:read char
:if char = "i"
:read char
:if char = "n"
:read char
:if char = "c"
:read char
:if char = "e"
:read char
:if char = " "
:read char
:if char = "b"
:read char
:if char = "a"
:read char
:if char = "s"
:read char
:if char = "e"
:read char
:if char = "6"
:read char
:if char = "4"
:read char
:if char = "3"
:read char
:if char = "2"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "3"
:read char
:if char = "6"
:read char
:if char = "5"
:read char
:if char = "3"
:read char
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