4 files changed, 303 insertions, 0 deletions

diff --git a/viewer/src/services/dragscrollclickfix.ts b/viewer/src/services/dragscrollclickfix.ts
new file mode 100644
index 0000000..38eb106
--- /dev/null
+++ b/viewer/src/services/dragscrollclickfix.ts
@@ -0,0 +1,52 @@
+/* ldgallery - A static generator which turns a collection of tagged
+--             pictures into a searchable web gallery.
+--
+-- Copyright (C) 2019-2020  Guillaume FOUET
+--
+-- 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 <https://www.gnu.org/licenses/>.
+*/
+
+// https://github.com/donmbelembe/vue-dragscroll/issues/61
+export default class DragScrollClickFix {
+
+  readonly DRAG_DELAY = 250; // This is the minimal delay to consider a click to be a drag, mostly usefull for touch devices
+
+  timer: NodeJS.Timeout | null = null;
+  dragging: boolean = false;
+
+  onDragScrollStart() {
+    this.timer = setTimeout(() => this.onTimer(), this.DRAG_DELAY);
+  }
+
+  onTimer() {
+    this.timer = null;
+    this.dragging = true;
+  }
+
+  onDragScrollEnd() {
+    if (this.timer) {
+      clearTimeout(this.timer);
+      this.timer = null;
+    }
+    setTimeout(() => this.dragging = false);
+  }
+
+  onClickCapture(e: MouseEvent) {
+    if (this.dragging) {
+      this.dragging = false;
+      e.preventDefault();
+      e.stopPropagation();
+    }
+  }
+}
diff --git a/viewer/src/services/indexfactory.ts b/viewer/src/services/indexfactory.ts
new file mode 100644
index 0000000..a6bc865
--- /dev/null
+++ b/viewer/src/services/indexfactory.ts
@@ -0,0 +1,101 @@
+/* ldgallery - A static generator which turns a collection of tagged
+--             pictures into a searchable web gallery.
+--
+-- Copyright (C) 2019-2020  Guillaume FOUET
+--
+-- 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 <https://www.gnu.org/licenses/>.
+*/
+
+import { Operation } from '@/@types/Operation';
+import Navigation from '@/services/navigation';
+
+export default class IndexFactory {
+
+  public static generateTags(root: Gallery.Item | null): Tag.Index {
+    let tagsIndex: Tag.Index = {};
+    if (root) IndexFactory.pushTagsForItem(tagsIndex, root);
+    return tagsIndex;
+  }
+
+  // Pushes all tags for a root item (and its children) to the index
+  private static pushTagsForItem(tagsIndex: Tag.Index, item: Gallery.Item): void {
+    console.log("IndexingTagsFor: ", item.path);
+    if (item.properties.type === "directory") {
+      item.properties.items.forEach(item => this.pushTagsForItem(tagsIndex, item));
+      return; // Directories are not indexed
+    }
+    for (const tag of item.tags) {
+      const parts = tag.split('.');
+      let lastPart: string | null = null;
+      for (const part of parts) {
+        if (!tagsIndex[part]) tagsIndex[part] = { tag: part, tagfiltered: Navigation.normalize(part), items: [], children: {} };
+        if (!tagsIndex[part].items.includes(item)) tagsIndex[part].items.push(item);
+        if (lastPart) tagsIndex[lastPart].children[part] = tagsIndex[part];
+        lastPart = part;
+      }
+    }
+  }
+
+  // ---
+
+
+  public static searchTags(tagsIndex: Tag.Index, filter: string): Tag.Search[] {
+    let search: Tag.Search[] = [];
+    if (tagsIndex && filter) {
+      const operation = IndexFactory.extractOperation(filter);
+      if (operation !== Operation.INTERSECTION) filter = filter.slice(1);
+      if (filter.includes(":")) {
+        const filterParts = filter.split(":");
+        search = this.searchTagsFromFilterWithCategory(tagsIndex, operation, filterParts[0], filterParts[1]);
+      } else {
+        search = this.searchTagsFromFilter(tagsIndex, operation, filter);
+      }
+    }
+    return search;
+  }
+
+  private static extractOperation(filter: string): Operation {
+    const first = filter.slice(0, 1);
+    switch (first) {
+      case Operation.ADDITION:
+      case Operation.SUBSTRACTION:
+        return first;
+      default:
+        return Operation.INTERSECTION;
+    }
+  }
+
+  private static searchTagsFromFilterWithCategory(
+    tagsIndex: Tag.Index,
+    operation: Operation,
+    category: string,
+    disambiguation: string
+  ): Tag.Search[] {
+    disambiguation = Navigation.normalize(disambiguation);
+    return Object.values(tagsIndex)
+      .filter(node => node.tag.includes(category))
+      .flatMap(node =>
+        Object.values(node.children)
+          .filter(child => child.tagfiltered.includes(disambiguation))
+          .map(child => ({ ...child, parent: node, operation, display: `${operation}${node.tag}:${child.tag}` }))
+      );
+  }
+
+  private static searchTagsFromFilter(tagsIndex: Tag.Index, operation: Operation, filter: string): Tag.Search[] {
+    filter = Navigation.normalize(filter);
+    return Object.values(tagsIndex)
+      .filter(node => node.tagfiltered.includes(filter))
+      .map(node => ({ ...node, operation, display: `${operation}${node.tag}` }));
+  }
+}
diff --git a/viewer/src/services/indexsearch.ts b/viewer/src/services/indexsearch.ts
new file mode 100644
index 0000000..3e73fb1
--- /dev/null
+++ b/viewer/src/services/indexsearch.ts
@@ -0,0 +1,70 @@
+/* ldgallery - A static generator which turns a collection of tagged
+--             pictures into a searchable web gallery.
+--
+-- Copyright (C) 2019-2020  Guillaume FOUET
+--
+-- 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 <https://www.gnu.org/licenses/>.
+*/
+
+import { Operation } from '@/@types/Operation';
+
+export default class IndexSearch {
+
+  // Results of the search (by tags)
+  public static search(searchTags: Tag.Search[], rootPath: string): Gallery.Item[] {
+    const byOperation = this.extractTagsByOperation(searchTags);
+    const intersection = this.extractIntersection(byOperation);
+    const substraction = this.extractSubstraction(byOperation);
+    return this.aggregateAll(byOperation, intersection, substraction)
+      .filter(item => item.path.startsWith(rootPath));
+  }
+
+  private static extractTagsByOperation(searchTags: Tag.Search[]): Tag.SearchByOperation {
+    let byOperation: Tag.SearchByOperation = {};
+    Object.values(Operation).forEach(
+      operation => (byOperation[operation] = searchTags.filter(tag => tag.operation === operation))
+    );
+    return byOperation;
+  }
+
+  private static extractIntersection(byOperation: Tag.SearchByOperation): Set<Gallery.Item> {
+    let intersection = new Set<Gallery.Item>();
+    if (byOperation[Operation.INTERSECTION].length > 0) {
+      byOperation[Operation.INTERSECTION]
+        .map(tag => tag.items)
+        .reduce((a, b) => a.filter(c => b.includes(c)))
+        .flatMap(items => items)
+        .forEach(item => intersection.add(item));
+    }
+    return intersection;
+  }
+
+  private static extractSubstraction(byOperation: Tag.SearchByOperation): Set<Gallery.Item> {
+    let substraction = new Set<Gallery.Item>();
+    if (byOperation[Operation.SUBSTRACTION].length > 0) {
+      byOperation[Operation.SUBSTRACTION].flatMap(tag => tag.items).forEach(item => substraction.add(item));
+    }
+    return substraction;
+  }
+
+  private static aggregateAll(
+    byOperation: Tag.SearchByOperation,
+    intersection: Set<Gallery.Item>,
+    substraction: Set<Gallery.Item>
+  ): Gallery.Item[] {
+    byOperation[Operation.ADDITION].flatMap(tag => tag.items).forEach(item => intersection.add(item));
+    substraction.forEach(item => intersection.delete(item));
+    return [...intersection];