99 lines
3.0 KiB
Dart
99 lines
3.0 KiB
Dart
/*
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* Copyright (c) 2024-2025 Fabian Freund.
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*
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* This file is part of WebLibre
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* (see https://weblibre.eu).
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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import 'package:flutter/material.dart';
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/// Builds a [TextSpan] with highlighted sections based on prefix/suffix markers.
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///
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/// This function parses text that contains highlight markers (e.g., from FTS5
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/// search results) and creates a [TextSpan] with different styles for regular
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/// and highlighted text.
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///
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/// Example:
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/// ```dart
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/// final span = buildHighlightedText(
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/// 'Hello ***world***!',
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/// baseStyle,
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/// highlightStyle,
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/// '***',
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/// '***',
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/// );
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/// // Results in: "Hello " (base) + "world" (highlighted) + "!" (base)
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/// ```
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///
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/// [text] The text to parse for highlights
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/// [baseStyle] Style for non-highlighted text
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/// [highlightStyle] Style for highlighted text
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/// [matchPrefix] Marker that indicates the start of a highlight
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/// [matchSuffix] Marker that indicates the end of a highlight
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TextSpan buildHighlightedText(
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String text,
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TextStyle? baseStyle,
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TextStyle? highlightStyle,
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String matchPrefix,
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String matchSuffix, {
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bool normalizeWhitespaces = false,
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}) {
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final spans = <TextSpan>[];
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var currentIndex = 0;
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if (normalizeWhitespaces) {
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// ignore: parameter_assignments
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text = text.replaceAll(RegExp(r'\s+'), ' ');
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}
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while (currentIndex < text.length) {
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final prefixIndex = text.indexOf(matchPrefix, currentIndex);
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if (prefixIndex == -1) {
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spans.add(TextSpan(text: text.substring(currentIndex), style: baseStyle));
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break;
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}
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if (prefixIndex > currentIndex) {
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spans.add(
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TextSpan(
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text: text.substring(currentIndex, prefixIndex),
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style: baseStyle,
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),
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);
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}
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final suffixIndex = text.indexOf(
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matchSuffix,
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prefixIndex + matchPrefix.length,
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);
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if (suffixIndex == -1) {
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// No closing marker - highlight everything from prefix to end
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final highlightedText = text.substring(prefixIndex + matchPrefix.length);
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spans.add(TextSpan(text: highlightedText, style: highlightStyle));
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break;
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}
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final highlightedText = text.substring(
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prefixIndex + matchPrefix.length,
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suffixIndex,
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);
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spans.add(TextSpan(text: highlightedText, style: highlightStyle));
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currentIndex = suffixIndex + matchSuffix.length;
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}
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return TextSpan(children: spans);
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}
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