| """Language detection helpers.""" |
|
|
| from __future__ import annotations |
|
|
| from langdetect import DetectorFactory, detect |
| from langdetect.lang_detect_exception import ( |
| LangDetectException, |
| ) |
|
|
| DetectorFactory.seed = 0 |
|
|
| SUPPORTED = {"en", "fr", "ru"} |
|
|
| _FALLBACK_HINTS = { |
| "fr": ( |
| "bonjour", |
| "merci", |
| "prix", |
| "rendez-vous", |
| "horaire", |
| "livraison", |
| "devis", |
| ), |
| "ru": ( |
| "привет", |
| "спасибо", |
| "цена", |
| "доставка", |
| "запись", |
| "стоимость", |
| "здравствуйте", |
| ), |
| } |
|
|
|
|
| def detect_language(text: str, default: str = "en") -> str: |
| """Detect message language among en/fr/ru.""" |
| cleaned = (text or "").strip() |
| if not cleaned: |
| return default |
|
|
| lowered = cleaned.lower() |
| for lang, hints in _FALLBACK_HINTS.items(): |
| if any(h in lowered for h in hints): |
| return lang |
|
|
| try: |
| code = detect(cleaned) |
| except LangDetectException: |
| return default |
|
|
| if code.startswith("ru"): |
| return "ru" |
| if code.startswith("fr"): |
| return "fr" |
| if code.startswith("en"): |
| return "en" |
| return default |
|
|
|
|
| def normalize_ui_language(code: str) -> str: |
| """Clamp UI language to supported codes.""" |
| value = (code or "en").lower()[:2] |
| return value if value in SUPPORTED else "en" |
|
|
