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<h1><a href="../../../index.html">All files</a> / <a href="index.html">src/artifacts/refactoring</a> suggestion_engine.ts</h1>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">/**
* Refactoring Suggestion Engine - Phase 3 HOP 3.4
*
* AI-powered refactoring suggestion engine using similarity detection and naming validation.
*
* Architecture:
* - Similarity detection: Levenshtein distance with early termination heuristics
* - Naming validation: GDScript snake_case convention enforcement
* - Confidence scoring: Heuristic-based confidence for merge suggestions
*
* Performance:
* - Target: <2s for 300 signals
* - Optimization: Early termination reduces 45K → 5K comparisons
* - Heuristics: First char match, length difference ≤3
*
* @module refactoring/suggestion_engine
*/
import type { SignalGraph } from '../graph/types.js';
import { levenshtein } from './levenshtein.js';
import { isSnakeCase, toSnakeCase, validateNaming } from './naming_validator.js';
import {
RefactorType,
type RefactorSuggestion,
type RefactoringStats,
type SimilarityStats,
} from './types.js';
/**
* Generates refactoring suggestions for signal names.
*
* @example
* ```typescript
* const engine = new RefactoringEngine();
* const suggestions = await engine.generateSuggestions(signalGraph);
*
* console.log(`Generated ${suggestions.length} suggestions`);
* suggestions.forEach(s => {
* console.log(`${s.type}: ${s.target} → ${s.replacement} (${s.confidence})`);
* });
* ```
*/
export class RefactoringEngine {
private stats: RefactoringStats = <span class="cstat-no" title="statement not covered" >{</span>
totalSuggestions: 0,
mergeSuggestions: 0,
renameSuggestions: 0,
deprecateSuggestions: 0,
durationMs: 0,
avgConfidence: 0,
similarityStats: {
signalsAnalyzed: 0,
comparisonsPerformed: 0,
comparisonsSkipped: 0,
similarPairsFound: 0,
durationMs: 0,
},
};
/**
* Generate refactoring suggestions for signal graph.
*
* @param graph - Complete signal graph
* @returns Array of refactoring suggestions sorted by confidence (highest first)
*/
<span class="fstat-no" title="function not covered" > async </span>generateSuggestions(graph: SignalGraph): Promise<RefactorSuggestion[]> {
const startTime = <span class="cstat-no" title="statement not covered" >performance.now();</span>
const suggestions: RefactorSuggestion[] = <span class="cstat-no" title="statement not covered" >[];</span>
// Reset stats
<span class="cstat-no" title="statement not covered" > this.resetStats();</span>
const signals = <span class="cstat-no" title="statement not covered" >Array.from(graph.definitions.keys());</span>
<span class="cstat-no" title="statement not covered" > this.stats.similarityStats.signalsAnalyzed = signals.length;</span>
// Phase 1: Similarity detection with early termination
const similarityStartTime = <span class="cstat-no" title="statement not covered" >performance.now();</span>
const similaritySuggestions = <span class="cstat-no" title="statement not covered" >this.detectSimilarSignals(signals);</span>
<span class="cstat-no" title="statement not covered" > this.stats.similarityStats.durationMs = performance.now() - similarityStartTime;</span>
<span class="cstat-no" title="statement not covered" > suggestions.push(...similaritySuggestions);</span>
<span class="cstat-no" title="statement not covered" > this.stats.mergeSuggestions = similaritySuggestions.length;</span>
// Phase 2: Naming convention validation
<span class="cstat-no" title="statement not covered" > for (const [signalName, defs] of graph.definitions) {</span>
const violation = <span class="cstat-no" title="statement not covered" >validateNaming(</span>
signalName,
defs.map(<span class="fstat-no" title="function not covered" >d </span>=> <span class="cstat-no" title="statement not covered" >d.filePath)</span>
);
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (violation) {</span>
<span class="cstat-no" title="statement not covered" > suggestions.push({</span>
type: RefactorType.Rename,
target: signalName,
replacement: violation.suggestedFix,
confidence: 1.0, // Perfect confidence for convention violations
reason: `GDScript convention: ${this.formatViolationType(violation.violationType)}`,
affectedFiles: violation.filePaths,
});
<span class="cstat-no" title="statement not covered" > this.stats.renameSuggestions++;</span>
}
}
// Sort by confidence (highest first)
<span class="cstat-no" title="statement not covered" > suggestions.sort(<span class="fstat-no" title="function not covered" >(a</span>, b) => <span class="cstat-no" title="statement not covered" >b.confidence - a.confidence)</span>;</span>
// Update stats
<span class="cstat-no" title="statement not covered" > this.stats.totalSuggestions = suggestions.length;</span>
<span class="cstat-no" title="statement not covered" > this.stats.durationMs = performance.now() - startTime;</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (suggestions.length > 0) {</span>
const totalConfidence = <span class="cstat-no" title="statement not covered" >suggestions.reduce(<span class="fstat-no" title="function not covered" >(s</span>um, s) => <span class="cstat-no" title="statement not covered" >sum + s.confidence,</span> 0);</span>
<span class="cstat-no" title="statement not covered" > this.stats.avgConfidence = totalConfidence / suggestions.length;</span>
}
<span class="cstat-no" title="statement not covered" > return suggestions;</span>
}
/**
* Detect similar signal names using Levenshtein distance with early termination.
*
* Early termination heuristics:
* 1. First character mismatch → skip (different category likely)
* 2. Length difference > 3 → skip (too dissimilar)
*
* @param signals - Array of signal names
* @returns Array of merge suggestions
*/
private <span class="fstat-no" title="function not covered" >detectSimilarSignals(</span>signals: string[]): RefactorSuggestion[] {
const suggestions: RefactorSuggestion[] = <span class="cstat-no" title="statement not covered" >[];</span>
const n = <span class="cstat-no" title="statement not covered" >signals.length;</span>
<span class="cstat-no" title="statement not covered" > for (let i = <span class="cstat-no" title="statement not covered" >0;</span> i < n; i++) {</span>
<span class="cstat-no" title="statement not covered" > for (let j = <span class="cstat-no" title="statement not covered" >i + 1;</span> j < n; j++) {</span>
const sig1 = <span class="cstat-no" title="statement not covered" >signals[i];</span>
const sig2 = <span class="cstat-no" title="statement not covered" >signals[j];</span>
// Early termination heuristic 1: First character mismatch
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (sig1[0] !== sig2[0]) {</span>
<span class="cstat-no" title="statement not covered" > this.stats.similarityStats.comparisonsSkipped++;</span>
<span class="cstat-no" title="statement not covered" > continue;</span>
}
// Early termination heuristic 2: Length difference > 3
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (Math.abs(sig1.length - sig2.length) > 3) {</span>
<span class="cstat-no" title="statement not covered" > this.stats.similarityStats.comparisonsSkipped++;</span>
<span class="cstat-no" title="statement not covered" > continue;</span>
}
// Perform Levenshtein distance calculation
<span class="cstat-no" title="statement not covered" > this.stats.similarityStats.comparisonsPerformed++;</span>
const distance = <span class="cstat-no" title="statement not covered" >levenshtein(sig1, sig2);</span>
// Threshold: distance ≤ 2 (very similar)
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (distance <= 2) {</span>
<span class="cstat-no" title="statement not covered" > this.stats.similarityStats.similarPairsFound++;</span>
const confidence = <span class="cstat-no" title="statement not covered" >this.computeSimilarityConfidence(sig1, sig2, distance);</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (confidence >= 0.98) {</span>
<span class="cstat-no" title="statement not covered" > suggestions.push({</span>
type: RefactorType.Merge,
target: sig1,
replacement: sig2,
confidence,
reason: `Similar names (Levenshtein distance: ${distance})`,
distance,
});
}
}
}
}
<span class="cstat-no" title="statement not covered" > return suggestions;</span>
}
/**
* Compute confidence for similarity-based merge suggestions.
*
* Confidence factors:
* - Distance 1 + both snake_case: 0.99
* - Distance 1: 0.98
* - Distance 2 + both snake_case: 0.98
* - Distance 2: 0.97 (below threshold, not suggested)
*
* @param s1 - First signal name
* @param s2 - Second signal name
* @param distance - Levenshtein distance
* @returns Confidence score (0.0-1.0)
*/
private <span class="fstat-no" title="function not covered" >computeSimilarityConfidence(</span>s1: string, s2: string, distance: number): number {
const bothSnakeCase = <span class="cstat-no" title="statement not covered" >isSnakeCase(s1) && isSnakeCase(s2);</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (distance === 1) {</span>
<span class="cstat-no" title="statement not covered" > return bothSnakeCase ? 0.99 : 0.98;</span>
}
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (distance === 2) {</span>
<span class="cstat-no" title="statement not covered" > return bothSnakeCase ? 0.98 : 0.97;</span>
}
<span class="cstat-no" title="statement not covered" > return 0.95; </span>// Distance > 2 (shouldn't reach here due to threshold)
}
/**
* Format violation type for human-readable reason.
*/
private <span class="fstat-no" title="function not covered" >formatViolationType(</span>violationType: string): string {
<span class="cstat-no" title="statement not covered" > switch (violationType) {</span>
case 'not_snake_case':
<span class="cstat-no" title="statement not covered" > return 'signals should use snake_case';</span>
case 'starts_with_uppercase':
<span class="cstat-no" title="statement not covered" > return 'signals should start with lowercase letter';</span>
case 'contains_spaces':
<span class="cstat-no" title="statement not covered" > return 'signals cannot contain spaces';</span>
default:
<span class="cstat-no" title="statement not covered" > return 'naming convention violation';</span>
}
}
/**
* Get refactoring statistics.
*/
<span class="fstat-no" title="function not covered" > getStats(</span>): RefactoringStats {
<span class="cstat-no" title="statement not covered" > return { ...this.stats };</span>
}
/**
* Reset refactoring statistics.
*/
<span class="fstat-no" title="function not covered" > resetStats(</span>): void {
<span class="cstat-no" title="statement not covered" > this.stats = {</span>
totalSuggestions: 0,
mergeSuggestions: 0,
renameSuggestions: 0,
deprecateSuggestions: 0,
durationMs: 0,
avgConfidence: 0,
similarityStats: {
signalsAnalyzed: 0,
comparisonsPerformed: 0,
comparisonsSkipped: 0,
similarPairsFound: 0,
durationMs: 0,
},
};
}
}
</pre></td></tr></table></pre>
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