mangayomi-mirror/lib/utils/extensions/string_extensions.dart

import 'dart:ffi';
import 'package:ffi/ffi.dart';

extension StringExtensions on String {
  String substringAfter(String pattern) {
    final startIndex = indexOf(pattern);
    if (startIndex == -1) return substring(0);

    final start = startIndex + pattern.length;
    return substring(start);
  }

  String substringAfterLast(String pattern) {
    return split(pattern).last;
  }

  String substringBefore(String pattern) {
    final endIndex = indexOf(pattern);
    if (endIndex == -1) return substring(0);

    return substring(0, endIndex);
  }

  String substringBeforeLast(String pattern) {
    final endIndex = lastIndexOf(pattern);
    if (endIndex == -1) return substring(0);

    return substring(0, endIndex);
  }

  String substringBetween(String left, String right) {
    int startIndex = 0;
    int index = indexOf(left, startIndex);
    if (index == -1) return "";
    int leftIndex = index + left.length;
    int rightIndex = indexOf(right, leftIndex);
    if (rightIndex == -1) return "";
    startIndex = rightIndex + right.length;
    return substring(leftIndex, rightIndex);
  }

  String replaceForbiddenCharacters(String source) {
    return replaceAll(
      RegExp(r'[\\/:*?"<>|\0]|(^CON$|^PRN$|^AUX$|^NUL$|^COM[1-9]$|^LPT[1-9]$)'),
      source,
    );
  }

  String get getUrlWithoutDomain {
    final uri = Uri.parse(replaceAll(' ', '%20'));
    String out = uri.path;
    if (uri.query.isNotEmpty) {
      out += '?${uri.query}';
    }
    if (uri.fragment.isNotEmpty) {
      out += '#${uri.fragment}';
    }
    return out;
  }

  bool isMediaVideo() {
    // Match against the URL path only — query strings (e.g. AnimeGG's
    // `?for=...`) and fragments must not defeat the suffix check. Use a
    // leading `.` so e.g. `flashmp4` doesn't accidentally match.
    final lower = (Uri.tryParse(this)?.path ?? this).toLowerCase();
    return const [
      "3gp",
      "avi",
      "mpg",
      "mpeg",
      "webm",
      "ogg",
      "flv",
      "m4v",
      "mvp",
      "mp4",
      "wmv",
      "mkv",
      "mov",
    ].any((extension) => lower.endsWith(".$extension"));
  }
}

extension DefaultValueExtension on String? {
  String? trimmedOrDefault(String? defaultValue) {
    if (this?.trim().isNotEmpty ?? false) {
      return this!.trim();
    }
    return defaultValue;
  }
}

extension NativeStringExtensions on List<String> {
  Pointer<Pointer<Int8>> strListToPointer() {
    final strings = this;
    List<Pointer<Int8>> int8PointerList = strings
        .map((str) => str.toNativeUtf8().cast<Int8>())
        .toList();

    final Pointer<Pointer<Int8>> pointerPointer = malloc.allocate(
      int8PointerList.length,
    );

    strings.asMap().forEach((index, utf) {
      pointerPointer[index] = int8PointerList[index];
    });

    return pointerPointer;
  }
}