# Qfod 解析器

> 所属模块：[解析器设计](./概览.md)

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## 1. 日志格式

**格式：** `X#:Q A->B C D E`

**示例：** `0#:Q 1->25 45.5 20.5 2`

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## 2. 字段定义

| 字段标识 | 字段名称 | 数据类型 | 取值范围 | 说明 |
|----------|----------|----------|----------|------|
| X | ChargerIndex | byte | 0, 1 | 充电器索引 |
| A | CoilIndex | byte | 0, 1, 2 | 线圈索引 |
| B | DeltaQ | int | - | Q值变化量（ΔQ = CurrentQ - RawQ） |
| C | CurrentQ | float | - | 当前实时Q值 |
| D | RawQ | float | - | 原始Q值 |
| E | FodType | byte | 见Table 2 | 异物类型编码 |

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## 3. 正则表达式

```csharp
// Parsers/QfodParser.cs
private static readonly Regex QfodPattern = new(
    @"^(\d)#:Q\s+(\d+)->(-?\d+)\s+([-\d.]+)\s+([-\d.]+)\s+(\d+)$",
    RegexOptions.Compiled
);
```

**捕获组映射：**

| 捕获组 | 字段 | 类型转换 |
|--------|------|----------|
| Group 1 | ChargerIndex | byte.Parse() |
| Group 2 | CoilIndex | byte.Parse() |
| Group 3 | DeltaQ | int.Parse() |
| Group 4 | CurrentQ | float.Parse() |
| Group 5 | RawQ | float.Parse() |
| Group 6 | FodType | byte.Parse() |

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## 4. 解析器实现

```csharp
// Parsers/QfodParser.cs
using System.Text.RegularExpressions;
using WCTDataMiner.Models;

namespace WCTDataMiner.Parsers;

public class QfodParser : IParser<QfodRecord>
{
    private static readonly Regex QfodPattern = new(
        @"^(\d)#:Q\s+(\d+)->(-?\d+)\s+([-\d.]+)\s+([-\d.]+)\s+(\d+)$",
        RegexOptions.Compiled
    );

    public bool CanParse(string line) => QfodPattern.IsMatch(line);

    public ParseResult<QfodRecord> Parse(string line, int lineNumber, Guid logFileId)
    {
        var match = QfodPattern.Match(line);
        if (!match.Success)
        {
            return ParseResult<QfodRecord>.Failure(
                "FORMAT_MISMATCH",
                "Line does not match Qfod pattern"
            );
        }

        try
        {
            var record = new QfodRecord
            {
                LogFileId = logFileId,
                LineNumber = lineNumber,
                ChargerIndex = byte.Parse(match.Groups[1].Value),
                CoilIndex = byte.Parse(match.Groups[2].Value),
                DeltaQ = int.Parse(match.Groups[3].Value),
                CurrentQ = float.Parse(match.Groups[4].Value),
                RawQ = float.Parse(match.Groups[5].Value),
                FodType = byte.Parse(match.Groups[6].Value)
            };

            return ParseResult<QfodRecord>.Success(record);
        }
        catch (Exception ex)
        {
            return ParseResult<QfodRecord>.Failure(
                "TYPE_CONVERSION",
                $"Failed to convert field: {ex.Message}"
            );
        }
    }
}
```

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## 5. 检测通道组合

`ChargerIndex + CoilIndex` 组合唯一标识一个检测通道：

| ChargerIndex | CoilIndex | 检测通道 |
|--------------|-----------|----------|
| 0 | 0 | 充电器0 线圈0 |
| 0 | 1 | 充电器0 线圈1 |
| 0 | 2 | 充电器0 线圈2 |
| 1 | 0 | 充电器1 线圈0 |
| 1 | 1 | 充电器1 线圈1 |
| 1 | 2 | 充电器1 线圈2 |