feat: Add unified language detector for code analysis
- Created LanguageDetector class supporting 20+ programming languages - Confidence-based detection with customizable thresholds (min_confidence parameter) - Replaces duplicate language detection code in doc_scraper and pdf_extractor - Comprehensive test suite with 100+ test cases Changes: - NEW: src/skill_seekers/cli/language_detector.py (17 KB) - Unified detector with pattern matching for 20+ languages - Confidence scoring (0.0-1.0 scale) - Supports: Python, JavaScript, TypeScript, Java, C++, C#, Go, Rust, PHP, Ruby, Swift, Kotlin, Shell, SQL, HTML, CSS, JSON, YAML, XML, and more - NEW: tests/test_language_detector.py (20 KB) - 100+ test cases covering all supported languages - Edge case testing (mixed code, low confidence, etc.) - MODIFIED: src/skill_seekers/cli/doc_scraper.py - Removed 80+ lines of duplicate detection code - Now uses shared LanguageDetector instance - MODIFIED: src/skill_seekers/cli/pdf_extractor_poc.py - Removed 130+ lines of duplicate detection code - Now uses shared LanguageDetector instance - MODIFIED: tests/test_pdf_extractor.py - Fixed imports to use proper package paths - Added manual detector initialization in test setup Benefits: - DRY: Single source of truth for language detection - Maintainability: Add new languages in one place - Consistency: Same detection logic across all scrapers - Testability: Comprehensive test coverage - Extensibility: Easy to add new languages or improve patterns Addresses technical debt from having duplicate detection logic in multiple files.
This commit is contained in:
yusyus
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src/skill_seekers/cli/language_detector.py
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554
src/skill_seekers/cli/language_detector.py
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#!/usr/bin/env python3
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"""
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Unified Language Detection for Code Blocks
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Provides confidence-based language detection for documentation scrapers.
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Supports 20+ programming languages with weighted pattern matching.
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Author: Skill Seekers Project
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"""
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import re
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from typing import Optional, Tuple, Dict, List
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# Comprehensive language patterns with weighted confidence scoring
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# Weight 5: Unique identifiers (highly specific)
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# Weight 4: Strong indicators
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# Weight 3: Common patterns
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# Weight 2: Moderate indicators
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# Weight 1: Weak indicators
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LANGUAGE_PATTERNS: Dict[str, List[Tuple[str, int]]] = {
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# ===== PRIORITY 1: Unity C# (Critical - User's Primary Issue) =====
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'csharp': [
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# Unity-specific patterns (weight 4-5, CRITICAL)
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(r'\busing\s+UnityEngine', 5),
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(r'\bMonoBehaviour\b', 5),
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(r'\bGameObject\b', 4),
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(r'\bTransform\b', 4),
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(r'\bVector[23]\b', 3),
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(r'\bQuaternion\b', 3),
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(r'\bvoid\s+Start\s*\(\)', 4),
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(r'\bvoid\s+Update\s*\(\)', 4),
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(r'\bvoid\s+Awake\s*\(\)', 4),
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(r'\bvoid\s+OnEnable\s*\(\)', 3),
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(r'\bvoid\s+OnDisable\s*\(\)', 3),
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(r'\bvoid\s+FixedUpdate\s*\(\)', 4),
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(r'\bvoid\s+LateUpdate\s*\(\)', 4),
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(r'\bvoid\s+OnCollisionEnter', 4),
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(r'\bvoid\s+OnTriggerEnter', 4),
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(r'\bIEnumerator\b', 4),
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(r'\bStartCoroutine\s*\(', 4),
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(r'\byield\s+return\s+new\s+WaitForSeconds', 4),
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(r'\byield\s+return\s+null', 3),
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(r'\byield\s+return', 4),
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(r'\[SerializeField\]', 4),
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(r'\[RequireComponent', 4),
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(r'\[Header\(', 3),
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(r'\[Range\(', 3),
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(r'\bTime\.deltaTime\b', 4),
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(r'\bInput\.Get', 4),
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(r'\bRigidbody\b', 3),
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(r'\bCollider\b', 3),
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(r'\bRenderer\b', 3),
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(r'\bGetComponent<', 3),
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# Basic C# patterns (weight 2-4)
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(r'\bnamespace\s+\w+', 3),
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(r'\busing\s+System', 3),
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(r'\bConsole\.WriteLine', 4), # C#-specific output
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(r'\bConsole\.Write', 3),
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(r'\bpublic\s+class\s+\w+', 4), # Increased to match Java weight
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(r'\bprivate\s+class\s+\w+', 3),
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(r'\binternal\s+class\s+\w+', 4), # C#-specific modifier
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(r'\bstring\s+\w+\s*[;=]', 2), # C#-specific lowercase string
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(r'\bprivate\s+\w+\s+\w+\s*;', 2), # Private fields (common in both C# and Java)
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(r'\{\s*get;\s*set;\s*\}', 3), # Auto properties
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(r'\{\s*get;\s*private\s+set;\s*\}', 3),
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(r'\{\s*get\s*=>\s*', 2), # Expression properties
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(r'\bpublic\s+static\s+void\s+', 2),
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# Modern C# patterns (weight 2)
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(r'\bfrom\s+\w+\s+in\s+', 2), # LINQ
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(r'\.Where\s*\(', 2),
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(r'\.Select\s*\(', 2),
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(r'\basync\s+Task', 2),
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(r'\bawait\s+', 2),
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(r'\bvar\s+\w+\s*=', 1),
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],
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# ===== PRIORITY 2: Frontend Languages =====
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'typescript': [
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# TypeScript-specific (weight 4-5)
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(r'\binterface\s+\w+\s*\{', 5),
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(r'\btype\s+\w+\s*=', 4),
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(r':\s*\w+\s*=', 3), # Type annotation
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(r':\s*\w+\[\]', 3), # Array type
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(r'<[\w,\s]+>', 2), # Generic type
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(r'\bas\s+\w+', 2), # Type assertion
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(r'\benum\s+\w+\s*\{', 4),
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(r'\bimplements\s+\w+', 3),
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(r'\bexport\s+interface', 4),
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(r'\bexport\s+type', 4),
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# Also has JS patterns (weight 1)
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(r'\bconst\s+\w+\s*=', 1),
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(r'\blet\s+\w+\s*=', 1),
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(r'=>', 1),
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],
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'javascript': [
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(r'\bfunction\s+\w+\s*\(', 3),
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(r'\bconst\s+\w+\s*=', 2),
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(r'\blet\s+\w+\s*=', 2),
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(r'=>', 2), # Arrow function
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(r'\bconsole\.log', 2),
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(r'\bvar\s+\w+\s*=', 1),
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(r'\.then\s*\(', 2), # Promise
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(r'\.catch\s*\(', 2), # Promise
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(r'\basync\s+function', 3),
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(r'\bawait\s+', 2),
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(r'require\s*\(', 2), # CommonJS
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(r'\bexport\s+default', 2), # ES6
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(r'\bexport\s+const', 2),
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],
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'jsx': [
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# JSX patterns (weight 4-5)
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(r'<\w+\s+[^>]*>', 4), # JSX tag with attributes
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(r'<\w+\s*/>', 4), # Self-closing tag
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(r'className=', 3), # React className
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(r'onClick=', 3), # React event
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(r'\brender\s*\(\s*\)\s*\{', 4), # React render
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(r'\buseState\s*\(', 4), # React hook
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(r'\buseEffect\s*\(', 4), # React hook
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(r'\buseRef\s*\(', 3),
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(r'\buseCallback\s*\(', 3),
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(r'\buseMemo\s*\(', 3),
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# Also has JS patterns
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(r'\bconst\s+\w+\s*=', 1),
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(r'=>', 1),
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],
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'tsx': [
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# TSX = TypeScript + JSX (weight 5)
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(r'<\w+\s+[^>]*>', 3), # JSX tag
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(r':\s*React\.\w+', 5), # React types
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(r'interface\s+\w+Props', 5), # Props interface
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(r'\bFunctionComponent<', 4),
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(r'\bReact\.FC<', 4),
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(r'\buseState<', 4), # Typed hook
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(r'\buseRef<', 3),
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# Also has TS patterns
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(r'\binterface\s+\w+', 2),
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(r'\btype\s+\w+\s*=', 2),
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],
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'vue': [
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# Vue SFC patterns (weight 4-5)
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(r'<template>', 5),
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(r'<script>', 3),
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(r'<style\s+scoped>', 4),
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(r'\bexport\s+default\s*\{', 3),
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(r'\bdata\s*\(\s*\)\s*\{', 4), # Vue 2
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(r'\bcomputed\s*:', 3),
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(r'\bmethods\s*:', 3),
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(r'\bsetup\s*\(', 4), # Vue 3 Composition
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(r'\bref\s*\(', 4), # Vue 3
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(r'\breactive\s*\(', 4), # Vue 3
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(r'v-bind:', 3),
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(r'v-for=', 3),
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(r'v-if=', 3),
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(r'v-model=', 3),
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],
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# ===== PRIORITY 3: Backend Languages =====
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'java': [
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(r'\bpublic\s+class\s+\w+', 4),
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(r'\bprivate\s+\w+\s+\w+', 2),
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(r'\bSystem\.out\.println', 3),
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(r'\bpublic\s+static\s+void\s+main', 4),
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(r'\bpublic\s+\w+\s+\w+\s*\(', 2),
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(r'@Override', 3),
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(r'@Autowired', 3), # Spring
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(r'@Service', 3), # Spring
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(r'@RestController', 3), # Spring
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(r'@GetMapping', 3), # Spring
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(r'@PostMapping', 3), # Spring
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(r'\bimport\s+java\.', 2),
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(r'\bextends\s+\w+', 2),
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],
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'go': [
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(r'\bfunc\s+\w+\s*\(', 3),
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(r'\bpackage\s+\w+', 4),
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(r':=', 3), # Short declaration
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(r'\bfmt\.Print', 2),
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(r'\bfunc\s+\(.*\)\s+\w+\s*\(', 4), # Method
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(r'\bdefer\s+', 3),
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(r'\bgo\s+\w+\s*\(', 3), # Goroutine
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(r'\bchan\s+', 3), # Channel
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(r'\binterface\{\}', 2), # Empty interface
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(r'\bfunc\s+main\s*\(\)', 4),
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],
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'rust': [
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(r'\bfn\s+\w+\s*\(', 4),
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(r'\blet\s+mut\s+\w+', 3),
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(r'\bprintln!', 3),
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(r'\bimpl\s+\w+', 3),
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(r'\buse\s+\w+::', 3),
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(r'\bpub\s+fn\s+', 3),
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(r'\bmatch\s+\w+\s*\{', 3),
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(r'\bSome\(', 2),
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(r'\bNone\b', 2),
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(r'\bResult<', 3),
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(r'\bOption<', 3),
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(r'&str\b', 2),
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(r'\bfn\s+main\s*\(\)', 4),
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],
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'php': [
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(r'<\?php', 5),
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(r'\$\w+\s*=', 2),
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(r'\bfunction\s+\w+\s*\(', 2),
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(r'\bpublic\s+function', 3),
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(r'\bprivate\s+function', 3),
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(r'\bclass\s+\w+', 3),
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(r'\bnamespace\s+\w+', 3),
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(r'\buse\s+\w+\\', 2),
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(r'->', 2), # Object operator
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(r'::', 1), # Static operator
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],
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# ===== PRIORITY 4: System/Data Languages =====
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'python': [
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(r'\bdef\s+\w+\s*\(', 3),
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(r'\bimport\s+\w+', 2),
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(r'\bclass\s+\w+:', 3),
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(r'\bfrom\s+\w+\s+import', 2),
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(r':\s*$', 1), # Lines ending with :
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(r'@\w+', 2), # Decorator
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(r'\bself\.\w+', 2),
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(r'\b__init__\s*\(', 3),
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(r'\basync\s+def\s+', 3),
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(r'\bawait\s+', 2),
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(r'\bprint\s*\(', 1),
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],
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'r': [
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(r'<-', 4), # Assignment operator
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(r'\bfunction\s*\(', 2),
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(r'\blibrary\s*\(', 3),
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(r'\bggplot\s*\(', 4), # ggplot2
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(r'\bdata\.frame\s*\(', 3),
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(r'\%>\%', 4), # Pipe operator
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(r'\bsummary\s*\(', 2),
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(r'\bread\.csv\s*\(', 3),
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],
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'julia': [
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(r'\bfunction\s+\w+\s*\(', 3),
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(r'\bend\b', 2),
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(r'\busing\s+\w+', 3),
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(r'::', 2), # Type annotation
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(r'\bmodule\s+\w+', 3),
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(r'\babstract\s+type', 3),
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(r'\bstruct\s+\w+', 3),
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],
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'sql': [
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(r'\bSELECT\s+', 4),
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(r'\bFROM\s+', 3),
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(r'\bWHERE\s+', 2),
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(r'\bINSERT\s+INTO', 4),
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(r'\bCREATE\s+TABLE', 4),
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(r'\bJOIN\s+', 3),
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(r'\bGROUP\s+BY', 3),
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(r'\bORDER\s+BY', 3),
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(r'\bUPDATE\s+', 3),
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(r'\bDELETE\s+FROM', 3),
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],
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# ===== Additional Languages =====
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'cpp': [
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(r'#include\s*<', 4),
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(r'\bstd::', 3),
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(r'\bnamespace\s+\w+', 3),
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(r'\bcout\s*<<', 3),
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(r'\bvoid\s+\w+\s*\(', 2),
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(r'\bint\s+main\s*\(', 4),
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(r'->', 2), # Pointer
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],
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'c': [
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(r'#include\s*<', 4),
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(r'\bprintf\s*\(', 3),
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(r'\bint\s+main\s*\(', 4),
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(r'\bvoid\s+\w+\s*\(', 2),
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(r'\bstruct\s+\w+', 3),
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],
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'gdscript': [
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(r'\bfunc\s+\w+\s*\(', 3),
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(r'\bvar\s+\w+\s*=', 3),
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(r'\bextends\s+\w+', 4),
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(r'\b_ready\s*\(', 4),
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(r'\b_process\s*\(', 4),
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],
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# ===== Markup/Config Languages =====
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'html': [
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(r'<!DOCTYPE\s+html>', 5),
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(r'<html', 4),
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(r'<head>', 3),
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(r'<body>', 3),
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(r'<div', 2),
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(r'<span', 2),
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(r'<script', 2),
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],
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'css': [
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(r'\{\s*[\w-]+\s*:', 3),
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(r'@media', 3),
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(r'\.[\w-]+\s*\{', 2),
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(r'#[\w-]+\s*\{', 2),
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(r'@import', 2),
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],
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'json': [
|
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(r'^\s*\{', 3),
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(r'^\s*\[', 3),
|
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(r'"\w+"\s*:', 3),
|
||||
(r':\s*["\d\[\{]', 2),
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],
|
||||
|
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'yaml': [
|
||||
(r'^\w+:', 3),
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(r'^\s+-\s+\w+', 2),
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(r'---', 2),
|
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(r'^\s+\w+:', 2),
|
||||
],
|
||||
|
||||
'xml': [
|
||||
(r'<\?xml', 5),
|
||||
(r'<\w+\s+\w+=', 2),
|
||||
(r'<\w+>', 1),
|
||||
(r'</\w+>', 1),
|
||||
],
|
||||
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'markdown': [
|
||||
(r'^#+\s+', 3),
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||||
(r'^\*\*\w+\*\*', 2),
|
||||
(r'^\s*[-*]\s+', 2),
|
||||
(r'\[.*\]\(.*\)', 2),
|
||||
],
|
||||
|
||||
'bash': [
|
||||
(r'#!/bin/bash', 5),
|
||||
(r'#!/bin/sh', 5),
|
||||
(r'\becho\s+', 2),
|
||||
(r'\$\{?\w+\}?', 2),
|
||||
(r'\bif\s+\[', 2),
|
||||
(r'\bfor\s+\w+\s+in', 2),
|
||||
],
|
||||
|
||||
'shell': [
|
||||
(r'#!/bin/bash', 5),
|
||||
(r'#!/bin/sh', 5),
|
||||
(r'\becho\s+', 2),
|
||||
(r'\$\{?\w+\}?', 2),
|
||||
],
|
||||
|
||||
'powershell': [
|
||||
(r'\$\w+\s*=', 2),
|
||||
(r'Get-\w+', 3),
|
||||
(r'Set-\w+', 3),
|
||||
(r'\bWrite-Host\s+', 2),
|
||||
],
|
||||
}
|
||||
|
||||
|
||||
# Known language list for CSS class detection
|
||||
KNOWN_LANGUAGES = [
|
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"javascript", "java", "xml", "html", "python", "bash", "cpp", "typescript",
|
||||
"go", "rust", "php", "ruby", "swift", "kotlin", "csharp", "c", "sql",
|
||||
"yaml", "json", "markdown", "css", "scss", "sass", "jsx", "tsx", "vue",
|
||||
"shell", "powershell", "r", "scala", "dart", "perl", "lua", "elixir",
|
||||
"julia", "gdscript",
|
||||
]
|
||||
|
||||
|
||||
class LanguageDetector:
|
||||
"""
|
||||
Unified confidence-based language detection for code blocks.
|
||||
|
||||
Supports 20+ programming languages with weighted pattern matching.
|
||||
Uses two-stage detection:
|
||||
1. CSS class extraction (high confidence = 1.0)
|
||||
2. Pattern-based heuristics with confidence scoring (0.0-1.0)
|
||||
|
||||
Example:
|
||||
detector = LanguageDetector(min_confidence=0.3)
|
||||
lang, confidence = detector.detect_from_html(elem, code)
|
||||
|
||||
if confidence >= 0.7:
|
||||
print(f"High confidence: {lang}")
|
||||
elif confidence >= 0.5:
|
||||
print(f"Medium confidence: {lang}")
|
||||
else:
|
||||
print(f"Low confidence: {lang}")
|
||||
"""
|
||||
|
||||
def __init__(self, min_confidence: float = 0.15):
|
||||
"""
|
||||
Initialize language detector.
|
||||
|
||||
Args:
|
||||
min_confidence: Minimum confidence threshold (0-1)
|
||||
0.3 = low, 0.5 = medium, 0.7 = high
|
||||
"""
|
||||
self.min_confidence = min_confidence
|
||||
self._pattern_cache: Dict[str, List[Tuple[re.Pattern, int]]] = {}
|
||||
self._compile_patterns()
|
||||
|
||||
def _compile_patterns(self) -> None:
|
||||
"""Compile regex patterns and cache them for performance"""
|
||||
for lang, patterns in LANGUAGE_PATTERNS.items():
|
||||
self._pattern_cache[lang] = [
|
||||
(re.compile(pattern, re.IGNORECASE | re.MULTILINE), weight)
|
||||
for pattern, weight in patterns
|
||||
]
|
||||
|
||||
def detect_from_html(self, elem, code: str) -> Tuple[str, float]:
|
||||
"""
|
||||
Detect language from HTML element with CSS classes + code content.
|
||||
|
||||
Args:
|
||||
elem: BeautifulSoup element with 'class' attribute
|
||||
code: Code content string
|
||||
|
||||
Returns:
|
||||
Tuple of (language, confidence) where confidence is 0.0-1.0
|
||||
"""
|
||||
# Tier 1: CSS classes (confidence 1.0)
|
||||
if elem:
|
||||
css_lang = self.extract_language_from_classes(elem.get('class', []))
|
||||
if css_lang:
|
||||
return css_lang, 1.0
|
||||
|
||||
# Check parent pre element
|
||||
parent = elem.parent
|
||||
if parent and parent.name == 'pre':
|
||||
css_lang = self.extract_language_from_classes(parent.get('class', []))
|
||||
if css_lang:
|
||||
return css_lang, 1.0
|
||||
|
||||
# Tier 2: Pattern matching
|
||||
return self.detect_from_code(code)
|
||||
|
||||
def detect_from_code(self, code: str) -> Tuple[str, float]:
|
||||
"""
|
||||
Detect language from code content only (for PDFs, GitHub files).
|
||||
|
||||
Args:
|
||||
code: Code content string
|
||||
|
||||
Returns:
|
||||
Tuple of (language, confidence) where confidence is 0.0-1.0
|
||||
"""
|
||||
# Edge case: code too short
|
||||
if len(code.strip()) < 10:
|
||||
return 'unknown', 0.0
|
||||
|
||||
# Calculate confidence scores for all languages
|
||||
scores = self._calculate_confidence(code)
|
||||
|
||||
if not scores:
|
||||
return 'unknown', 0.0
|
||||
|
||||
# Get language with highest score
|
||||
best_lang = max(scores.items(), key=lambda x: x[1])
|
||||
lang, confidence = best_lang
|
||||
|
||||
# Apply minimum confidence threshold
|
||||
if confidence < self.min_confidence:
|
||||
return 'unknown', 0.0
|
||||
|
||||
return lang, confidence
|
||||
|
||||
def extract_language_from_classes(self, classes: List[str]) -> Optional[str]:
|
||||
"""
|
||||
Extract language from CSS class list.
|
||||
|
||||
Supports patterns:
|
||||
- language-* (e.g., language-python)
|
||||
- lang-* (e.g., lang-javascript)
|
||||
- brush: * (e.g., brush: java)
|
||||
- Bare names (e.g., python, java)
|
||||
|
||||
Args:
|
||||
classes: List of CSS class names
|
||||
|
||||
Returns:
|
||||
Language string or None if not found
|
||||
"""
|
||||
if not classes:
|
||||
return None
|
||||
|
||||
for cls in classes:
|
||||
# Handle brush: pattern
|
||||
if 'brush:' in cls:
|
||||
parts = cls.split('brush:')
|
||||
if len(parts) > 1:
|
||||
lang = parts[1].strip().lower()
|
||||
if lang in KNOWN_LANGUAGES:
|
||||
return lang
|
||||
|
||||
# Handle language- prefix
|
||||
if cls.startswith('language-'):
|
||||
lang = cls[9:].lower()
|
||||
if lang in KNOWN_LANGUAGES:
|
||||
return lang
|
||||
|
||||
# Handle lang- prefix
|
||||
if cls.startswith('lang-'):
|
||||
lang = cls[5:].lower()
|
||||
if lang in KNOWN_LANGUAGES:
|
||||
return lang
|
||||
|
||||
# Handle bare class name
|
||||
if cls.lower() in KNOWN_LANGUAGES:
|
||||
return cls.lower()
|
||||
|
||||
return None
|
||||
|
||||
def _calculate_confidence(self, code: str) -> Dict[str, float]:
|
||||
"""
|
||||
Calculate weighted confidence scores for all languages.
|
||||
|
||||
Args:
|
||||
code: Code content string
|
||||
|
||||
Returns:
|
||||
Dictionary mapping language names to confidence scores (0.0-1.0)
|
||||
"""
|
||||
scores: Dict[str, float] = {}
|
||||
|
||||
for lang, compiled_patterns in self._pattern_cache.items():
|
||||
total_score = 0
|
||||
|
||||
for pattern, weight in compiled_patterns:
|
||||
if pattern.search(code):
|
||||
total_score += weight
|
||||
|
||||
if total_score > 0:
|
||||
# Normalize score to 0-1 range
|
||||
# Score of 10+ = 1.0 confidence
|
||||
confidence = min(total_score / 10.0, 1.0)
|
||||
scores[lang] = confidence
|
||||
|
||||
return scores
|
||||
Reference in New Issue
Block a user