Snobol4【1】 语言实现日志统计 API【2】
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 设计。它以其简洁的语法和强大的字符串处理能力而闻名。尽管在现代编程中Snobol4 已经不再流行，但它在某些特定领域，如文本处理和日志分析，仍然有其独特的应用价值。
本文将探讨如何使用Snobol4 语言实现一个简单的日志统计 API。我们将通过以下步骤来完成这个任务：
1. 理解日志格式【3】：我们需要了解日志的格式，以便正确解析和处理。
2. 设计API接口【4】：定义API的输入和输出格式。
3. 编写Snobol4代码：使用Snobol4语言编写解析和统计日志的代码。
4. 测试API：验证API的功能是否正确。
步骤 1：理解日志格式
日志通常包含时间戳【5】、日志级别【6】、消息内容等信息。以下是一个简单的日志示例：
2023-04-01 12:34:56 INFO Application started
2023-04-01 12:35:01 DEBUG User logged in
2023-04-01 12:35:10 ERROR Invalid credentials
步骤 2：设计API接口
我们的API将接受一个包含日志数据的字符串，并返回一个包含统计信息的JSON对象【7】。以下是API的预期输入和输出：
输入：
POST /api/logs/statistics
Content-Type: text/plain
2023-04-01 12:34:56 INFO Application started
2023-04-01 12:35:01 DEBUG User logged in
2023-04-01 12:35:10 ERROR Invalid credentials
输出：
HTTP/1.1 200 OK
Content-Type: application/json
{
"info": 1,
"debug": 1,
"error": 1
}
步骤 3：编写Snobol4代码
以下是使用Snobol4编写的日志统计API的核心代码：
```snobol
:LOGS
| "INFO" !INFO
| "DEBUG" !DEBUG
| "ERROR" !ERROR
| "INFO" !INFO
| "DEBUG" !DEBUG
| "ERROR" !ERROR
| "INFO" !INFO
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