87 lines
2.8 KiB
Dart
87 lines
2.8 KiB
Dart
/// Utility functions for text processing
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class TextUtils {
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/// Convert Vietnamese characters to English (non-accented) characters
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/// Example: "Tuấn" -> "tuan", "Hồ Chí Minh" -> "ho chi minh"
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static String removeVietnameseAccents(String text) {
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if (text.isEmpty) return text;
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// Convert to lowercase for consistent comparison
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String result = text.toLowerCase();
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// Map of Vietnamese characters to their non-accented equivalents
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const vietnameseMap = {
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// a with accents
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'á': 'a', 'à': 'a', 'ả': 'a', 'ã': 'a', 'ạ': 'a',
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'ă': 'a', 'ắ': 'a', 'ằ': 'a', 'ẳ': 'a', 'ẵ': 'a', 'ặ': 'a',
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'â': 'a', 'ấ': 'a', 'ầ': 'a', 'ẩ': 'a', 'ẫ': 'a', 'ậ': 'a',
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// e with accents
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'é': 'e', 'è': 'e', 'ẻ': 'e', 'ẽ': 'e', 'ẹ': 'e',
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'ê': 'e', 'ế': 'e', 'ề': 'e', 'ể': 'e', 'ễ': 'e', 'ệ': 'e',
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// i with accents
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'í': 'i', 'ì': 'i', 'ỉ': 'i', 'ĩ': 'i', 'ị': 'i',
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// o with accents
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'ó': 'o', 'ò': 'o', 'ỏ': 'o', 'õ': 'o', 'ọ': 'o',
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'ô': 'o', 'ố': 'o', 'ồ': 'o', 'ổ': 'o', 'ỗ': 'o', 'ộ': 'o',
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'ơ': 'o', 'ớ': 'o', 'ờ': 'o', 'ở': 'o', 'ỡ': 'o', 'ợ': 'o',
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// u with accents
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'ú': 'u', 'ù': 'u', 'ủ': 'u', 'ũ': 'u', 'ụ': 'u',
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'ư': 'u', 'ứ': 'u', 'ừ': 'u', 'ử': 'u', 'ữ': 'u', 'ự': 'u',
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// y with accents
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'ý': 'y', 'ỳ': 'y', 'ỷ': 'y', 'ỹ': 'y', 'ỵ': 'y',
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// d with stroke
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'đ': 'd',
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};
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// Replace each Vietnamese character with its non-accented equivalent
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vietnameseMap.forEach((vietnamese, english) {
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result = result.replaceAll(vietnamese, english);
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});
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return result;
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}
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/// Normalize text for search (lowercase + remove accents)
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static String normalizeForSearch(String text) {
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return removeVietnameseAccents(text.toLowerCase().trim());
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}
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/// Check if a text contains a search term (Vietnamese-aware, case-insensitive)
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///
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/// Example:
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/// ```dart
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/// containsVietnameseSearch("Nguyễn Văn Tuấn", "tuan") // returns true
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/// containsVietnameseSearch("tuan@example.com", "TUAN") // returns true
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/// ```
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static bool containsVietnameseSearch(String text, String searchTerm) {
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if (searchTerm.isEmpty) return true;
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if (text.isEmpty) return false;
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final normalizedText = normalizeForSearch(text);
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final normalizedSearch = normalizeForSearch(searchTerm);
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return normalizedText.contains(normalizedSearch);
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}
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/// Check if any of the provided texts contains the search term
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static bool containsVietnameseSearchInAny(
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List<String> texts,
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String searchTerm,
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) {
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if (searchTerm.isEmpty) return true;
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for (final text in texts) {
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if (containsVietnameseSearch(text, searchTerm)) {
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return true;
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}
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}
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return false;
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}
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}
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