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lib/core/utils/emoji_keyword_index.dart

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+import 'dart:convert';
+
+import 'package:flutter/services.dart';
+
+class _Entry {
+  final String emoji;
+  final List<String> tokens;
+
+  const _Entry(this.emoji, this.tokens);
+}
+
+class EmojiKeywordIndex {
+  EmojiKeywordIndex._();
+
+  static final EmojiKeywordIndex instance = EmojiKeywordIndex._();
+
+  static const _variationSelector = '️';
+  static final _wordPattern = RegExp(r'[0-9a-zа-яё\-]{2,}', unicode: true);
+
+  final List<_Entry> _entries = [];
+  final Set<String> _emojiKeys = {};
+  Future<void>? _loading;
+
+  Future<void> ensureLoaded() => _loading ??= _load();
+
+  Future<void> _load() async {
+    final raw = await rootBundle.loadString('assets/emoji_keywords.json');
+    final map = json.decode(raw) as Map<String, dynamic>;
+    map.forEach((emoji, words) {
+      _entries.add(_Entry(emoji, (words as String).split(' ')));
+      _emojiKeys.add(emoji);
+    });
+  }
+
+  static String normalize(String emoji) =>
+      emoji.replaceAll(_variationSelector, '');
+
+  Set<String> resolve(String query) {
+    final q = query.trim().toLowerCase();
+    if (q.isEmpty) return const {};
+
+    final targets = <String>{};
+    final normalized = normalize(q);
+    for (final key in _emojiKeys) {
+      if (normalized.contains(key)) targets.add(key);
+    }
+
+    final words = _wordPattern
+        .allMatches(q)
+        .map((m) => m.group(0)!)
+        .toList(growable: false);
+    if (words.isEmpty) return targets;
+
+    for (final entry in _entries) {
+      for (final word in words) {
+        if (_hasPrefix(entry.tokens, word)) {
+          targets.add(entry.emoji);
+          break;
+        }
+      }
+    }
+    return targets;
+  }
+
+  static bool _hasPrefix(List<String> tokens, String prefix) {
+    for (final token in tokens) {
+      if (token.startsWith(prefix)) return true;
+    }
+    return false;
+  }
+}