MOBILE-3565 pipes: Add some pipes

src/app/pipes/create-links.pipe.ts

@@ -0,0 +1,35 @@
+// (C) Copyright 2015 Moodle Pty Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import { Pipe, PipeTransform } from '@angular/core';
+
+/**
+ * Pipe to search URLs that are not inside <a> tags and add the corresponding <a> tags.
+ */
+@Pipe({
+    name: 'coreCreateLinks',
+})
+export class CoreCreateLinksPipe implements PipeTransform {
+    protected static replacePattern = /(\b(https?|ftp):\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|])(?![^<]*>|[^<>]*<\/)/gim;
+
+    /**
+     * Takes some text and adds anchor tags to all links that aren't inside anchors.
+     *
+     * @param text Text to treat.
+     * @return Treated text.
+     */
+    transform(text: string): string {
+        return text.replace(CoreCreateLinksPipe.replacePattern, '<a href="$1">$1</a>');
+    }
+}

src/app/pipes/no-tags.pipe.ts

@@ -0,0 +1,34 @@
+// (C) Copyright 2015 Moodle Pty Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import { Pipe, PipeTransform } from '@angular/core';
+
+/**
+ * Pipe to remove HTML tags.
+ */
+@Pipe({
+    name: 'coreNoTags',
+})
+export class CoreNoTagsPipe implements PipeTransform {
+
+    /**
+     * Takes a text and removes HTML tags.
+     *
+     * @param text The text to treat.
+     * @return Treated text.
+     */
+    transform(text: string): string {
+        return text.replace(/(<([^>]+)>)/ig, '');
+    }
+}

src/app/pipes/pipes.module.ts

@@ -0,0 +1,33 @@
+// (C) Copyright 2015 Moodle Pty Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import { NgModule } from '@angular/core';
+import { CoreCreateLinksPipe } from './create-links.pipe';
+import { CoreNoTagsPipe } from './no-tags.pipe';
+import { CoreTimeAgoPipe } from './time-ago.pipe';
+
+@NgModule({
+    declarations: [
+        CoreCreateLinksPipe,
+        CoreNoTagsPipe,
+        CoreTimeAgoPipe,
+    ],
+    imports: [],
+    exports: [
+        CoreCreateLinksPipe,
+        CoreNoTagsPipe,
+        CoreTimeAgoPipe,
+    ]
+})
+export class CorePipesModule {}

src/app/pipes/time-ago.pipe.ts

@@ -0,0 +1,53 @@
+// (C) Copyright 2015 Moodle Pty Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import { Pipe, PipeTransform } from '@angular/core';
+import { Translate } from '@singletons/core.singletons';
+import { CoreLogger } from '@singletons/logger';
+import moment from 'moment';
+
+/**
+ * Pipe to turn a UNIX timestamp to "time ago".
+ */
+@Pipe({
+    name: 'coreTimeAgo',
+})
+export class CoreTimeAgoPipe implements PipeTransform {
+    private logger: CoreLogger;
+
+    constructor() {
+        this.logger = CoreLogger.getInstance('CoreTimeAgoPipe');
+    }
+
+    /**
+     * Turn a UNIX timestamp to "time ago".
+     *
+     * @param timestamp The UNIX timestamp (without milliseconds).
+     * @return Formatted time.
+     */
+    transform(timestamp: string | number): string {
+        if (typeof timestamp == 'string') {
+            // Convert the value to a number.
+            const numberTimestamp = parseInt(timestamp, 10);
+            if (isNaN(numberTimestamp)) {
+                this.logger.error('Invalid value received', timestamp);
+
+                return timestamp;
+            }
+            timestamp = numberTimestamp;
+        }
+
+        return Translate.instance.instant('core.ago', {$a: moment(timestamp * 1000).fromNow(true)});
+    }
+}