Snobol4 语言 实战 开发文本格式化脚本实战

Snobol4 语言实战：开发文本格式化脚本

Snobol4 是一种古老的编程语言，最初由 Calvin Mooers 在1962年设计，主要用于文本处理。尽管它已经不像其他现代编程语言那样流行，但Snobol4在文本处理领域仍然有其独特的优势。本文将围绕Snobol4语言，通过一个实际的文本格式化脚本开发案例，探讨Snobol4在文本处理中的应用。

Snobol4 简介

Snobol4 是 Snobol（StriNg Oriented and symBOlic Language）语言的第四个版本。它是一种高级编程语言，特别适合于文本处理任务。Snobol4 的语法简洁，易于理解，同时提供了丰富的文本处理功能。

Snobol4 的特点

- 字符串处理能力强大：Snobol4 提供了丰富的字符串操作函数，如搜索、替换、分割等。
- 模式匹配：Snobol4 支持模式匹配，可以方便地进行文本搜索和替换。
- 流控制：Snobol4 提供了多种流控制结构，如循环、条件语句等。
- 数据结构：Snobol4 支持数组、列表等数据结构。

文本格式化脚本开发

脚本需求

假设我们需要开发一个文本格式化脚本，该脚本能够：

1. 将文本中的所有空行删除。
2. 将文本中的所有连续空格替换为一个空格。
3. 将文本中的所有数字替换为星号（）。

脚本设计

以下是一个简单的Snobol4脚本，用于实现上述需求：

```snobol
PUT 'This is a sample text with multiple spaces and numbers 12345.'
PUT 'This is another line with numbers 67890.'
PUT 'And this is the last line with numbers 111213.'
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT ' '
PUT '