feat: add forum for Danbooru (#291)

lib/api/danbooru/danbooru_api.dart

@@ -300,4 +300,20 @@ abstract class DanbooruApi {
   Future<HttpResponse> deleteFavoriteGroup(
     @Path() int groupId,
   );
+
+  @GET('/forum_topics.json')
+  Future<HttpResponse> getForumTopics({
+    @Query('page') int? page,
+    @Query('search[order]') String? order,
+    @Query('limit') int? limit,
+    @Query('only') String? only,
+  });
+
+  @GET('/forum_posts.json')
+  Future<HttpResponse> getForumPosts({
+    @Query('page') String? page,
+    @Query('search[topic_id]') int? topicId,
+    @Query('limit') int? limit,
+    @Query('only') String? only,
+  });
 }

lib/boorus/core/feats/dtext/bbcode.dart

@@ -0,0 +1,52 @@
+part of 'dtext_grammar.dart';
+
+Parser taggedElement(String tag) => (string('[$tag') &
+        ref0(attribute).optional() &
+        string(']') &
+        (string('[/$tag]').not() & any()).star().flatten() &
+        string('[/$tag]'))
+    .map((value) => BBCode(tag, value[3], value[1]));
+
+Parser attribute() => (char('=') & (char(']').not() & any()).star().flatten())
+    .map((value) => value[1]);
+
+Parser bbcode() =>
+    ref1(taggedElement, 'b') |
+    ref1(taggedElement, 'i') |
+    ref1(taggedElement, 'u') |
+    ref1(taggedElement, 's') |
+    ref1(taggedElement, 'spoiler') |
+    ref1(taggedElement, 'expand') |
+    ref1(taggedElement, 'quote');
+
+enum BBCodeTagType {
+  bold,
+  italic,
+  underline,
+  strikethrough,
+  spoiler,
+  expand,
+  quote,
+}
+
+class BBCode {
+  BBCode(
+    this.tag,
+    this.text,
+    this.attributes,
+  );
+  final String tag;
+  final String text;
+  final String? attributes;
+
+  BBCodeTagType get type => switch (tag) {
+        'b' => BBCodeTagType.bold,
+        'i' => BBCodeTagType.italic,
+        'u' => BBCodeTagType.underline,
+        's' => BBCodeTagType.strikethrough,
+        'spoiler' => BBCodeTagType.spoiler,
+        'expand' => BBCodeTagType.expand,
+        'quote' => BBCodeTagType.quote,
+        _ => throw Exception('Unknown tag type: $tag')
+      };
+}

lib/boorus/core/feats/dtext/common.dart

@@ -0,0 +1,7 @@
+part of 'dtext_grammar.dart';
+
+Parser url() =>
+    char('<').optional() &
+    (string('http://') | string('https://')) &
+    pattern('a-zA-Z0-9./-_,?=&;%:+').plus().flatten() &
+    char('>').optional();

lib/boorus/core/feats/dtext/dtext_grammar.dart

@@ -0,0 +1,33 @@
+// Package imports:
+import 'package:petitparser/petitparser.dart';
+
+part 'common.dart';
+part 'link.dart';
+part 'bbcode.dart';
+part 'line_break.dart';
+
+class DTextGrammarDefinition extends GrammarDefinition {
+  DTextGrammarDefinition({
+    required this.tagSearchUrl,
+  });
+
+  final String tagSearchUrl;
+
+  @override
+  Parser start() => ref0(document);
+
+  Parser document() => (ref0(bbcode) |
+          ref0(link) |
+          ref1(internalLink, tagSearchUrl) |
+          ref0(lineBreak) |
+          ref0(normalText))
+      .star();
+
+  Parser normalText() => (ref0(bbcode).not() &
+          ref0(lineBreak).not() &
+          ref1(internalLink, tagSearchUrl).not() &
+          ref0(link).not() &
+          any())
+      .plus()
+      .flatten();
+}

lib/boorus/core/feats/dtext/html_converter.dart

@@ -0,0 +1,46 @@
+// Project imports:
+import 'package:boorusama/boorus/core/feats/boorus/boorus.dart';
+import 'dtext_grammar.dart';
+
+String dtext(
+  String value, {
+  required Booru booru,
+}) {
+  final tagSearchUrl = '${booru.url}/posts?tags=';
+  final result =
+      DTextGrammarDefinition(tagSearchUrl: tagSearchUrl).build().parse(value);
+  return result.isSuccess ? grammarToHtmlString(result.value) : value;
+}
+
+String grammarToHtmlString(List<dynamic> value) {
+  final buffer = StringBuffer();
+  for (final element in value) {
+    final data = mapDataToString(element);
+    buffer.write(data);
+  }
+  return buffer.toString();
+}
+
+String mapDataToString(dynamic data) => switch (data) {
+      BBCode c => parseBBcodeToHtml(c),
+      LineBreakElement => '<br>',
+      UrlElement url => parseUrl(url),
+      String => data,
+      _ => data.toString(),
+    };
+
+String parseUrl(UrlElement url) {
+  final displayText = url.displayText ?? url.url;
+  return '<a href="${url.url}">$displayText</a>';
+}
+
+String parseBBcodeToHtml(BBCode text) => switch (text.tag) {
+      'b' => '<b>${text.text}</b>',
+      'i' => '<i>${text.text}</i>',
+      'u' => '<u>${text.text}</u>',
+      's' => '<s>${text.text}</s>',
+      'expand' =>
+        '<details><summary>${text.attributes ?? 'Show'}</summary>${text.text}</details>',
+      'quote' => '<blockquote>${text.text}</blockquote>',
+      _ => text.text
+    };

lib/boorus/core/feats/dtext/line_break.dart

@@ -0,0 +1,7 @@
+part of 'dtext_grammar.dart';
+
+Parser lineBreak() => string(r'\r\n').map((value) => const LineBreakElement());
+
+class LineBreakElement {
+  const LineBreakElement();
+}

lib/boorus/core/feats/dtext/link.dart

@@ -0,0 +1,45 @@
+part of 'dtext_grammar.dart';
+
+Parser link() =>
+    ref0(urlRawLink) | ref0(customTextLink) | ref0(markdownStyleLink);
+
+Parser internalLink(String baseUrl) =>
+    ref1(tagSearchLink, baseUrl) | ref1(wikiLink, baseUrl);
+
+Parser urlRawLink() => url().flatten().map((value) => UrlElement(value));
+Parser markdownStyleLink() => (char('[') &
+        pattern('^]').star().flatten() &
+        char(']') &
+        char('(') &
+        ref0(url).flatten() &
+        char(')'))
+    .map((value) => UrlElement(value[1], displayText: value[3]));
+
+Parser customTextLink() => (char('"') &
+        pattern('^"').star().flatten() &
+        char('"') &
+        char(':') &
+        char('[') &
+        ref0(url).flatten() &
+        char(']'))
+    .map((value) => UrlElement(value[5], displayText: value[1]));
+
+Parser tagSearchLink(String searchUrl) => (string('{{') &
+        pattern('^}').star().flatten() &
+        string('}}'))
+    .map((value) => UrlElement('$searchUrl${value[1]}', displayText: value[1]));
+
+Parser wikiLink(String wikiUrl) => (string('[[') &
+        pattern('^]').star().flatten() &
+        string(']]'))
+    .map((value) => UrlElement('$wikiUrl${value[1]}', displayText: value[1]));
+
+class UrlElement {
+  final String url;
+  final String? displayText;
+
+  UrlElement(this.url, {this.displayText});
+
+  @override
+  String toString() => 'UrlElement{url: $url, displayText: $displayText}';
+}

lib/boorus/core/widgets/posts/information_section.dart

@@ -12,6 +12,7 @@ import 'package:boorusama/dart.dart';
 import 'package:boorusama/flutter.dart';
 import 'package:boorusama/foundation/theme/theme_mode.dart';
 import 'package:boorusama/functional.dart';
+import 'package:boorusama/widgets/compact_chip.dart';
 import 'package:boorusama/widgets/widgets.dart';
 
 class InformationSection extends StatelessWidget {
@@ -79,29 +80,14 @@ class InformationSection extends StatelessWidget {
                     Flexible(
                       child: artistTags.firstOrNull.toOption().fold(
                             () => const SizedBox.shrink(),
-                            (artist) => Material(
-                              borderRadius: BorderRadius.circular(6),
-                              color: getTagColor(
+                            (artist) => CompactChip(
+                              label: artist.removeUnderscoreWithSpace(),
+                              onTap: () =>
+                                  onArtistTagTap?.call(context, artist),
+                              backgroundColor: getTagColor(
                                 TagCategory.artist,
                                 ThemeMode.amoledDark,
                               ),
-                              child: InkWell(
-                                borderRadius: BorderRadius.circular(6),
-                                onTap: () =>
-                                    onArtistTagTap?.call(context, artist),
-                                child: Container(
-                                  padding: const EdgeInsets.symmetric(
-                                    vertical: 2,
-                                    horizontal: 4,
-                                  ),
-                                  child: Text(
-                                    artist.removeUnderscoreWithSpace(),
-                                    style: const TextStyle(
-                                      fontWeight: FontWeight.w600,
-                                    ),
-                                  ),
-                                ),
-                              ),
                             ),
                           ),
                     ),

lib/boorus/danbooru/feats/favorites/data/favorite_group_dto.dart

@@ -1,5 +1,6 @@
 // Project imports:
 import 'package:boorusama/boorus/danbooru/feats/favorites/favorites.dart';
+import 'package:boorusama/boorus/danbooru/feats/users/users.dart';
 
 class FavoriteGroupDto {
   FavoriteGroupDto({

lib/boorus/danbooru/feats/favorites/favorites.dart

@@ -4,12 +4,10 @@ export 'app/favorite_groups_provider.dart';
 export 'app/favorites_notifier.dart';
 export 'app/favorites_provider.dart';
 export 'app/favorite_utils.dart';
-export 'data/creator_dto.dart';
 export 'data/favorite_dto.dart';
 export 'data/favorite_group_dto.dart';
 export 'data/favorite_group_repository.dart';
 export 'data/favorite_post_repository_api.dart';
-export 'models/creator.dart';
 export 'models/favorite.dart';
 export 'models/favorite_group.dart';
 export 'models/favorite_group_repository.dart';

lib/boorus/danbooru/feats/favorites/models/favorite_group.dart

@@ -2,7 +2,7 @@
 import 'package:equatable/equatable.dart';
 
 // Project imports:
-import 'package:boorusama/boorus/danbooru/feats/favorites/models/creator.dart';
+import 'package:boorusama/boorus/danbooru/feats/users/creator.dart';
 
 class FavoriteGroup extends Equatable {
   const FavoriteGroup({

lib/boorus/danbooru/feats/forums/danbooru_forum_provider.dart

@@ -0,0 +1,40 @@
+// Package imports:
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:riverpod_infinite_scroll/riverpod_infinite_scroll.dart';
+
+// Project imports:
+import 'package:boorusama/boorus/danbooru/danbooru_provider.dart';
+import 'package:boorusama/boorus/danbooru/feats/forums/forums.dart';
+import 'package:boorusama/boorus/danbooru/feats/forums/posts/danbooru_forum_post_repository.dart';
+import 'package:boorusama/boorus/danbooru/feats/forums/posts/danbooru_forum_posts_notifier.dart';
+
+final danbooruForumTopicRepoProvider =
+    Provider<DanbooruForumTopicRepository>((ref) {
+  return DanbooruForumTopicRepositoryApi(
+    api: ref.watch(danbooruApiProvider),
+  );
+});
+
+final danbooruForumTopicsProvider = StateNotifierProvider.autoDispose<
+    DanbooruForumTopicsNotifier, PagedState<int, DanbooruForumTopic>>((ref) {
+  return DanbooruForumTopicsNotifier(
+    repo: ref.watch(danbooruForumTopicRepoProvider),
+  );
+});
+
+final danbooruForumPostRepoProvider =
+    Provider<DanbooruForumPostRepository>((ref) {
+  return DanbooruForumPostRepositoryApi(
+    api: ref.watch(danbooruApiProvider),
+  );
+});
+
+final danbooruForumPostsProvider = StateNotifierProvider.autoDispose.family<
+    DanbooruForumPostsNotifier,
+    PagedState<int, DanbooruForumPost>,
+    int>((ref, topicId) {
+  return DanbooruForumPostsNotifier(
+    topicId: topicId,
+    repo: ref.watch(danbooruForumPostRepoProvider),
+  );
+});

lib/boorus/danbooru/feats/forums/forums.dart

@@ -0,0 +1,7 @@
+export 'danbooru_forum_provider.dart';
+export 'posts/danbooru_forum_post.dart';
+export 'posts/danbooru_forum_post_dto.dart';
+export 'topics/danbooru_forum_topic.dart';
+export 'topics/danbooru_forum_topic_dto.dart';
+export 'topics/danbooru_forum_topic_repository.dart';
+export 'topics/danbooru_forum_topics_notifier.dart';