Snobol4 语言 实战 实现数据转换脚本实战

Snobol4^【1】 语言实战：实现数据转换^【2】脚本实战

Snobol4 是一种古老的编程语言，最初在1962年由David J. Farber、Ralph E. Griswold 和 Ivan P. Polonsky 在贝尔实验室开发。它以其强大的字符串处理^【3】能力而闻名，特别适合于文本处理任务。尽管现代编程语言层出不穷，但Snobol4 仍然在某些领域有其独特的应用价值。本文将围绕Snobol4 语言，通过一个数据转换脚本的实战案例^【4】，展示其文本处理能力。

Snobol4 简介

Snobol4 是 Snobol3 的改进版本，它引入了更多的字符串处理函数和结构化编程特性。Snobol4 的语法相对简单，易于学习，但它的强大之处在于其丰富的字符串操作功能。

Snobol4 的基本语法

Snobol4 的程序由一系列规则组成，每个规则由一个或多个模式（pattern）和一个动作^【5】（action）组成。模式用于匹配输入字符串，动作则对匹配的字符串进行操作。

snobol
pattern action


以下是一些Snobol4 的基本语法元素：

- 模式：用于匹配输入字符串的模式，可以是字符、字符串、变量^【6】等。
- 动作：对匹配的字符串进行操作的代码块。
- 变量：用于存储数据的标识符。
- 控制结构^【7】：如if-then-else、while等。

数据转换脚本实战

实战背景

假设我们有一个包含员工信息的文本文件，格式如下：


John Doe, 30, Engineer
Jane Smith, 25, Designer
Mike Brown, 35, Manager


我们需要将这个文件转换为一个CSV格式^【8】的文件，其中包含员工的姓名和年龄。

实现步骤

1. 读取输入文件：使用Snobol4 的文件操作^【9】功能读取输入文件。
2. 解析数据：使用模式匹配^【10】和变量提取员工姓名和年龄。
3. 写入输出文件：将解析后的数据写入到CSV文件中。

代码实现

以下是一个简单的Snobol4 脚本，用于实现上述数据转换：

```snobol
$INFILE 'employees.txt'
$OUTFILE 'employees.csv'

VAR name, age, title

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WHILE $INFILE DO
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