Snobol4 语言实战：Markdown 代码块语法高亮处理
Markdown 是一种轻量级标记语言，常用于写作、文档和网页制作。它具有简洁的语法，易于阅读和编写。Markdown 本身并不支持代码块的高亮显示，这使得代码在文档中显得不够突出。为了解决这个问题，我们可以使用 Snobol4 语言编写一个简单的代码块语法高亮处理程序。本文将围绕这一主题，详细介绍 Snobol4 语言在 Markdown 代码块语法高亮处理中的应用。
Snobol4 简介
Snobol4 是一种高级编程语言，由 David J. Farber 和 Ralph E. Griswold 在 1962 年设计。它是一种解释型语言，以其强大的字符串处理能力而闻名。Snobol4 的语法简洁，易于理解，特别适合于文本处理任务。
Markdown 代码块语法
Markdown 代码块通常使用三个反引号（) 来标识。以下是一个简单的 Markdown 代码块示例：
markdown
def hello_world():
print("Hello, world!")
在这个例子中，代码块被三个反引号包围，并且语言标识符（例如 `python`）紧跟在第一个反引号后面。
Snobol4 代码块语法高亮处理
为了实现 Markdown 代码块的高亮显示，我们需要编写一个 Snobol4 程序，该程序能够识别 Markdown 代码块，并根据指定的语言进行语法高亮。
1. 输入处理
我们需要从 Markdown 文档中读取代码块。在 Snobol4 中，我们可以使用 `input` 命令来读取输入。
snobol
input line
2. 代码块识别
接下来，我们需要识别 Markdown 代码块。我们可以通过查找连续的三个反引号来识别代码块的开头和结尾。
snobol
codeblock: (
|'
|'
'
)
3. 语言识别
一旦我们识别出代码块，我们需要确定代码块所使用的编程语言。这可以通过查找紧跟在第一个反引号后面的语言标识符来实现。
snobol
language: (
|'python'
|'java'
|'javascript'
|'c'
|'c++'
|'ruby'
|'perl'
|'bash'
|'sql'
|'html'
|'css'
|'xml'
|'json'
|'yaml'
|'ini'
|'conf'
|'sh'
|'bat'
|'ps1'
|'ps2'
|'ps3'
|'ps4'
|'ps5'
|'ps6'
|'ps7'
|'ps8'
|'ps9'
|'ps10'
|'ps11'
|'ps12'
|'ps13'
|'ps14'
|'ps15'
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