prepare for multiple apps

2026-04-06 12:23:11 +02:00
parent bd1600e8dc
commit 5afc323f04
904 changed files with 29 additions and 29 deletions
@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) 2024-2026 Fabian Freund.
+ *
+ * This file is part of WebLibre
+ * (see https://weblibre.eu).
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+import 'package:flutter/material.dart';
+
+/// Builds a [TextSpan] with highlighted sections based on prefix/suffix markers.
+///
+/// This function parses text that contains highlight markers (e.g., from FTS5
+/// search results) and creates a [TextSpan] with different styles for regular
+/// and highlighted text.
+///
+/// Example:
+/// ```dart
+/// final span = buildHighlightedText(
+///   'Hello ***world***!',
+///   baseStyle,
+///   highlightStyle,
+///   '***',
+///   '***',
+/// );
+/// // Results in: "Hello " (base) + "world" (highlighted) + "!" (base)
+/// ```
+///
+/// [text] The text to parse for highlights
+/// [baseStyle] Style for non-highlighted text
+/// [highlightStyle] Style for highlighted text
+/// [matchPrefix] Marker that indicates the start of a highlight
+/// [matchSuffix] Marker that indicates the end of a highlight
+TextSpan buildHighlightedText(
+  String text,
+  TextStyle? baseStyle,
+  TextStyle? highlightStyle,
+  String matchPrefix,
+  String matchSuffix, {
+  bool normalizeWhitespaces = false,
+}) {
+  final spans = <TextSpan>[];
+  var currentIndex = 0;
+
+  if (normalizeWhitespaces) {
+    // ignore: parameter_assignments
+    text = text.replaceAll(RegExp(r'\s+'), ' ');
+  }
+
+  while (currentIndex < text.length) {
+    final prefixIndex = text.indexOf(matchPrefix, currentIndex);
+    if (prefixIndex == -1) {
+      spans.add(TextSpan(text: text.substring(currentIndex), style: baseStyle));
+      break;
+    }
+
+    if (prefixIndex > currentIndex) {
+      spans.add(
+        TextSpan(
+          text: text.substring(currentIndex, prefixIndex),
+          style: baseStyle,
+        ),
+      );
+    }
+
+    final suffixIndex = text.indexOf(
+      matchSuffix,
+      prefixIndex + matchPrefix.length,
+    );
+    if (suffixIndex == -1) {
+      // No closing marker - highlight everything from prefix to end
+      final highlightedText = text.substring(prefixIndex + matchPrefix.length);
+      spans.add(TextSpan(text: highlightedText, style: highlightStyle));
+      break;
+    }
+
+    final highlightedText = text.substring(
+      prefixIndex + matchPrefix.length,
+      suffixIndex,
+    );
+    spans.add(TextSpan(text: highlightedText, style: highlightStyle));
+
+    currentIndex = suffixIndex + matchSuffix.length;
+  }
+
+  return TextSpan(children: spans);
+}