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# Task ID: 74
**Title:** Implement Content Type Detection
**Status:** done
**Dependencies:** None
**Priority:** high
**Description:** Create a utility that detects content type (JSON, YAML, XML, code, prose) for structural splitting in the section-split stage.
**Details:**
Create `src/mcplocal/src/proxymodel/content-detection.ts`:
```typescript
export type ContentType = 'json' | 'yaml' | 'xml' | 'code' | 'prose';
export function detectContentType(content: string): ContentType {
const trimmed = content.trimStart();
// JSON detection
if (trimmed.startsWith('{') || trimmed.startsWith('[')) {
try {
JSON.parse(content);
return 'json';
} catch { /* not valid JSON, continue */ }
}
// XML detection
if (trimmed.startsWith('<?xml') || /^<[a-zA-Z][^>]*>/.test(trimmed)) {
return 'xml';
}
// YAML detection (key: value at start of lines)
if (/^[a-zA-Z_][a-zA-Z0-9_]*:\s/m.test(trimmed) && !trimmed.includes('{')) {
return 'yaml';
}
// Code detection (common patterns)
const codePatterns = [
/^(function |class |def |const |let |var |import |export |package |pub fn |fn |impl )/m,
/^#include\s+[<"]/m,
/^(public |private |protected )?(static )?(void |int |string |bool )/m,
];
if (codePatterns.some(p => p.test(trimmed))) {
return 'code';
}
return 'prose';
}
```
**Test Strategy:**
Unit tests with sample content for each type: valid JSON objects/arrays, XML documents, YAML configs, code snippets in multiple languages (JS, Python, Rust, Go, Java), and prose markdown. Edge cases: JSON-like strings that aren't valid JSON, mixed content.