From 926e786688cfd1cea7d13ddb50001a31034a8fed Mon Sep 17 00:00:00 2001
From: Dani Palou <dani@moodle.com>
Date: Wed, 9 Oct 2019 15:02:53 +0200
Subject: [PATCH] MOBILE-2491 filter: Implement algebra filter

---
 src/addon/filter/algebra/algebra.module.ts    | 34 ++++++++++++++
 src/addon/filter/algebra/providers/handler.ts | 45 +++++++++++++++++++
 src/addon/filter/filter.module.ts             |  2 +
 3 files changed, 81 insertions(+)
 create mode 100644 src/addon/filter/algebra/algebra.module.ts
 create mode 100644 src/addon/filter/algebra/providers/handler.ts

diff --git a/src/addon/filter/algebra/algebra.module.ts b/src/addon/filter/algebra/algebra.module.ts
new file mode 100644
index 000000000..8b34d7afb
--- /dev/null
+++ b/src/addon/filter/algebra/algebra.module.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 { NgModule } from '@angular/core';
+import { IonicModule } from 'ionic-angular';
+import { CoreFilterDelegate } from '@core/filter/providers/delegate';
+import { AddonFilterAlgebraHandler } from './providers/handler';
+
+@NgModule({
+    declarations: [
+    ],
+    imports: [
+        IonicModule
+    ],
+    providers: [
+        AddonFilterAlgebraHandler
+    ]
+})
+export class AddonFilterAlgebraModule {
+    constructor(filterDelegate: CoreFilterDelegate, handler: AddonFilterAlgebraHandler) {
+        filterDelegate.registerHandler(handler);
+    }
+}
diff --git a/src/addon/filter/algebra/providers/handler.ts b/src/addon/filter/algebra/providers/handler.ts
new file mode 100644
index 000000000..5079ff659
--- /dev/null
+++ b/src/addon/filter/algebra/providers/handler.ts
@@ -0,0 +1,45 @@
+
+// (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 { Injectable } from '@angular/core';
+import { CoreFilterDefaultHandler } from '@core/filter/providers/default-filter';
+import { CoreFilterFormatTextOptions } from '@core/filter/providers/filter';
+import { CoreSite } from '@classes/site';
+
+/**
+ * Handler to support the Algebra notation filter.
+ */
+@Injectable()
+export class AddonFilterAlgebraHandler extends CoreFilterDefaultHandler {
+    name = 'AddonFilterAlgebraHandler';
+    filterName = 'algebra';
+
+    constructor() {
+        super();
+
+        // This filter is handled by Moodle, nothing to do in the app.
+    }
+
+    /**
+     * Check if the filter should be applied in a certain site based on some filter options.
+     *
+     * @param options Options.
+     * @param site Site.
+     * @return Whether filter should be applied.
+     */
+    shouldBeApplied(options: CoreFilterFormatTextOptions, site?: CoreSite): boolean {
+        return false;
+    }
+}
diff --git a/src/addon/filter/filter.module.ts b/src/addon/filter/filter.module.ts
index 617f623c6..f2646d346 100644
--- a/src/addon/filter/filter.module.ts
+++ b/src/addon/filter/filter.module.ts
@@ -14,6 +14,7 @@
 
 import { NgModule } from '@angular/core';
 import { AddonFilterActivityNamesModule } from './activitynames/activitynames.module';
+import { AddonFilterAlgebraModule } from './algebra/algebra.module';
 import { AddonFilterCensorModule } from './censor/censor.module';
 import { AddonFilterDataModule } from './data/data.module';
 import { AddonFilterEmailProtectModule } from './emailprotect/emailprotect.module';
@@ -29,6 +30,7 @@ import { AddonFilterUrlToLinkModule } from './urltolink/urltolink.module';
     declarations: [],
     imports: [
         AddonFilterActivityNamesModule,
+        AddonFilterAlgebraModule,
         AddonFilterCensorModule,
         AddonFilterDataModule,
         AddonFilterEmailProtectModule,