Ambiance MCP Server

/** * @fileOverview: Cyclomatic complexity analysis for code files * @module: ComplexityAnalysis * @keyFunctions: * - calculateCyclomaticComplexity(): Calculate cyclomatic complexity metrics * @context: Provides code complexity analysis for quality assessment */ /** * Calculate cyclomatic complexity for source code */ export function calculateCyclomaticComplexity(code: string): { totalComplexity: number; decisionPoints: number; rating: string; description: string; breakdown: Record<string, number>; } { // Remove comments and strings to avoid false positives const cleanCode = code .replace(/\/\*[\s\S]*?\*\//g, '') // Remove block comments .replace(/\/\/.*$/gm, '') // Remove line comments .replace(/['`](?:[^'`\\]|\\.)*['`]/g, '') // Remove template literals and strings .replace(/"(?:[^"\\]|\\.)*"/g, ''); // Remove double-quoted strings // Count decision points that add to cyclomatic complexity const patterns = [ { name: 'if', pattern: /\bif\s*\(/g }, { name: 'else-if', pattern: /\belse\s+if\s*\(/g }, { name: 'while', pattern: /\bwhile\s*\(/g }, { name: 'for', pattern: /\bfor\s*\(/g }, { name: 'do-while', pattern: /\bdo\s*\{/g }, { name: 'switch-case', pattern: /\bcase\s+/g }, { name: 'catch', pattern: /\bcatch\s*\(/g }, { name: 'logical-and', pattern: /&&/g }, { name: 'logical-or', pattern: /\|\|/g }, { name: 'ternary', pattern: /\?\s*[^.\s]/g }, { name: 'optional-chain', pattern: /\?\./g }, { name: 'nullish-coalescing', pattern: /\?\?/g }, ]; let totalDecisionPoints = 0; const breakdown: Record<string, number> = {}; patterns.forEach(({ name, pattern }) => { const matches = cleanCode.match(pattern) || []; breakdown[name] = matches.length; totalDecisionPoints += matches.length; }); // Base complexity is 1, plus decision points const totalComplexity = 1 + totalDecisionPoints; // Determine rating and description let rating = 'low'; let description = ''; if (totalComplexity <= 10) { rating = 'low'; description = 'Simple, easy to test and maintain'; } else if (totalComplexity <= 20) { rating = 'moderate'; description = 'More complex, moderate risk'; } else if (totalComplexity <= 50) { rating = 'high'; description = 'Complex, high risk for defects'; } else { rating = 'very high'; description = 'Very complex, difficult to test and maintain'; } return { totalComplexity, decisionPoints: totalDecisionPoints, rating, description, breakdown, }; }