Snobol4【1】 语言实战：Markdown【2】 代码块【3】语法高亮处理【4】
Markdown 是一种轻量级标记语言，常用于写作、文档和博客。它具有简洁的语法，易于阅读和编写。Markdown 本身并不支持代码高亮显示，这使得阅读代码时不够直观。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【5】，以其强大的字符串处理【6】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【7】（) 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，`def`、`hello_world`、`print` 和 `"Hello, world!"` 都是代码的一部分。
Snobol4 代码块语法高亮处理
为了实现 Markdown 代码块语法高亮处理，我们需要编写一个 Snobol4 程序，该程序能够识别 Markdown 代码块，并对其中的代码进行高亮显示。以下是一个简单的 Snobol4 程序示例：
snobol
:proc highlight_markdown
input line
if line == "" then"
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