99 lines
3.3 KiB
Dart
99 lines
3.3 KiB
Dart
import 'dart:convert';
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import 'package:flutter/services.dart';
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/// Helper class for converting between ISO 639-1 (2-letter) and ISO 639-2 (3-letter) language codes
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class LanguageCodes {
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static Map<String, dynamic>? _codes;
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/// Load the language codes from JSON
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static Future<void> initialize() async {
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if (_codes != null) return;
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final jsonString = await rootBundle.loadString('lib/data/iso_639_codes.json');
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_codes = json.decode(jsonString) as Map<String, dynamic>;
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}
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/// Get all possible variations of a language code
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/// Handles both ISO 639-1 (2-letter) and ISO 639-2 (3-letter) codes
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/// Returns a list of codes to check against track languages
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static List<String> getVariations(String languageCode) {
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if (_codes == null) {
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throw StateError('LanguageCodes not initialized. Call initialize() first.');
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}
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final normalized = languageCode.toLowerCase().trim();
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final variations = <String>{normalized}; // Use Set to avoid duplicates
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// Check if it's a 2-letter code (ISO 639-1)
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if (_codes!.containsKey(normalized)) {
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final entry = _codes![normalized] as Map<String, dynamic>;
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// Add the 639-1 code
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if (entry.containsKey('639-1')) {
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variations.add((entry['639-1'] as String).toLowerCase());
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}
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// Add the 639-2 code
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if (entry.containsKey('639-2')) {
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variations.add((entry['639-2'] as String).toLowerCase());
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}
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// Add the 639-2/B code if it exists (bibliographic variant)
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if (entry.containsKey('639-2/B')) {
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variations.add((entry['639-2/B'] as String).toLowerCase());
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}
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} else {
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// It might be a 3-letter code, search for it
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for (var entry in _codes!.values) {
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final entryMap = entry as Map<String, dynamic>;
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// Check if this entry contains our code as 639-2 or 639-2/B
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final code6392 = entryMap['639-2'] as String?;
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final code6392B = entryMap['639-2/B'] as String?;
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if (code6392?.toLowerCase() == normalized || code6392B?.toLowerCase() == normalized) {
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// Add all variations from this entry
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if (entryMap.containsKey('639-1')) {
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variations.add((entryMap['639-1'] as String).toLowerCase());
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}
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if (code6392 != null) {
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variations.add(code6392.toLowerCase());
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}
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if (code6392B != null) {
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variations.add(code6392B.toLowerCase());
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}
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break;
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}
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}
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}
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return variations.toList();
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}
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/// Get the English name of a language from its code
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static String? getLanguageName(String languageCode) {
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if (_codes == null) return null;
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final normalized = languageCode.toLowerCase().trim();
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// Check if it's a 2-letter code
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if (_codes!.containsKey(normalized)) {
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final entry = _codes![normalized] as Map<String, dynamic>;
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return entry['name'] as String?;
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}
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// Search for 3-letter code
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for (var entry in _codes!.values) {
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final entryMap = entry as Map<String, dynamic>;
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final code6392 = entryMap['639-2'] as String?;
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final code6392B = entryMap['639-2/B'] as String?;
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if (code6392?.toLowerCase() == normalized || code6392B?.toLowerCase() == normalized) {
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return entryMap['name'] as String?;
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}
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}
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return null;
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}
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}
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