76 lines
3.5 KiB
Python
76 lines
3.5 KiB
Python
"""Language detection for code files."""
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from typing import Optional
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class LanguageDetector:
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EXTENSION_MAP = {
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'py': 'python', 'pyw': 'python', 'pyx': 'python',
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'js': 'javascript', 'mjs': 'javascript', 'cjs': 'javascript', 'jsx': 'javascript',
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'ts': 'typescript', 'tsx': 'typescript', 'mts': 'typescript', 'cts': 'typescript',
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'java': 'java', 'kt': 'kotlin', 'kts': 'kotlin',
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'go': 'go', 'rs': 'rust', 'c': 'c', 'h': 'c',
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'cpp': 'cpp', 'cc': 'cpp', 'cxx': 'cpp', 'hpp': 'cpp', 'hxx': 'cpp',
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'cs': 'csharp', 'rb': 'ruby', 'erb': 'ruby', 'php': 'php',
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'swift': 'swift', 'm': 'objective-c', 'mm': 'objective-c',
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'scala': 'scala', 'sc': 'scala', 'jl': 'julia',
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'r': 'r', 'R': 'r', 'lua': 'lua',
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'pl': 'perl', 'pm': 'perl', 'sql': 'sql',
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'sh': 'bash', 'bash': 'bash', 'zsh': 'bash', 'fish': 'bash',
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'yaml': 'yaml', 'yml': 'yaml', 'json': 'json',
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'xml': 'xml', 'html': 'html', 'htm': 'html',
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'css': 'css', 'scss': 'scss', 'sass': 'sass', 'less': 'less',
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'md': 'markdown', 'markdown': 'markdown',
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'txt': 'text', 'dockerfile': 'dockerfile', 'Dockerfile': 'dockerfile',
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}
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CONTENT_PATTERNS = {
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'python': [r'^import\s+\w+', r'^from\s+\w+\s+import', r'^def\s+\w+\s*\(', r'^class\s+\w+'],
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'javascript': [r'^const\s+\w+', r'^let\s+\w+', r'^var\s+\w+', r'^function\s+\w+', r'=>\s*\{'],
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'typescript': [r'^interface\s+\w+', r'^type\s+\w+', r':\s*(string|number|boolean)'],
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'java': [r'^package\s+[\w.]+;', r'^import\s+[\w.]+;', r'^public\s+class\s+\w+'],
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'go': [r'^package\s+\w+', r'^import\s+\(', r'func\s+\w+'],
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'rust': [r'^fn\s+\w+', r'^impl\s+\w+', r'^struct\s+\w+', r'^enum\s+\w+'],
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'c': [r'#include\s*<', r'#include\s*"', r'int\s+main\s*\('],
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'cpp': [r'#include\s*<', r'#include\s*"', r'class\s+\w+', r'std::\w+'],
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'ruby': [r'^require\s+', r'^class\s+\w+', r'^module\s+\w+', r'def\s+\w+'],
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'php': [r'<\?php', r'\$\w+\s*=', r'function\s+\w+', r'class\s+\w+'],
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}
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def detect_from_filename(self, filename: str) -> Optional[str]:
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if '.' not in filename:
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return None
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ext = filename.rsplit('.', 1)[-1].lower()
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return self.EXTENSION_MAP.get(ext)
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def detect_from_content(self, content: str) -> Optional[str]:
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first_lines = '\n'.join(content.splitlines()[:50])
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scores = {}
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for lang, patterns in self.CONTENT_PATTERNS.items():
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import re
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score = sum(len(re.findall(p, first_lines, re.MULTILINE)) for p in patterns)
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if score > 0:
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scores[lang] = score
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return max(scores, key=scores.get) if scores else None
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def detect(self, filename: str, content: str = "") -> str:
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ext_lang = self.detect_from_filename(filename)
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if ext_lang and ext_lang not in ['text', 'markdown', 'json', 'yaml', 'xml', 'html', 'css', 'dockerfile']:
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return ext_lang
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if content:
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content_lang = self.detect_from_content(content)
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if content_lang:
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return content_lang
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return ext_lang or "text"
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def get_supported_languages(self) -> list[str]:
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return sorted(set(self.EXTENSION_MAP.values()))
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def is_language_supported(self, language: str) -> bool:
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return language in self.get_supported_languages()
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def detect_language(filename: str, content: str = "") -> str:
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detector = LanguageDetector()
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return detector.detect(filename, content)
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