feat(change_detection): uppercase and lowercase pipes

because the world needs more uppercase madness

[✔] clang-format
[✔] tests

modules/angular2/src/change_detection/change_detection.ts

@@ -5,6 +5,8 @@ import {IterableChangesFactory} from './pipes/iterable_changes';
 import {KeyValueChangesFactory} from './pipes/keyvalue_changes';
 import {ObservablePipeFactory} from './pipes/observable_pipe';
 import {PromisePipeFactory} from './pipes/promise_pipe';
+import {UpperCaseFactory} from './pipes/uppercase_pipe';
+import {LowerCaseFactory} from './pipes/lowercase_pipe';
 import {NullPipeFactory} from './pipes/null_pipe';
 import {ChangeDetection, ProtoChangeDetector, ChangeDetectorDefinition} from './interfaces';
 import {Injectable} from 'angular2/src/di/decorators';
@@ -39,10 +41,26 @@ export var iterableDiff: List <
 export var async: List <
     PipeFactory >= [new ObservablePipeFactory(), new PromisePipeFactory(), new NullPipeFactory()];
 
+/**
+ * Uppercase text transform.
+ *
+ * @exportedAs angular2/pipes
+ */
+export var uppercase: List < PipeFactory >= [new UpperCaseFactory(), new NullPipeFactory()];
+
+/**
+ * Lowercase text transform.
+ *
+ * @exportedAs angular2/pipes
+ */
+export var lowercase: List < PipeFactory >= [new LowerCaseFactory(), new NullPipeFactory()];
+
 export var defaultPipes = {
   "iterableDiff": iterableDiff,
   "keyValDiff": keyValDiff,
-  "async": async
+  "async": async,
+  "uppercase": uppercase,
+  "lowercase": lowercase
 };
 
 export var preGeneratedProtoDetectors = {};

modules/angular2/src/change_detection/pipes/lowercase_pipe.ts

@@ -0,0 +1,58 @@
+import {isString, StringWrapper} from 'angular2/src/facade/lang';
+import {Pipe} from './pipe';
+
+// HACK: workaround for Traceur behavior.
+// It expects all transpiled modules to contain this marker.
+// TODO: remove this when we no longer use traceur
+export var __esModule = true;
+
+/**
+ * Implements lowercase transforms to text.
+ *
+ * # Example
+ *
+ * In this example we transform the user text lowercase.
+ *
+ *  ```
+ * @Component({
+ *   selector: "username-cmp"
+ * })
+ * @View({
+ *  inline: "Username: {{ user | lowercase }}"
+ * })
+ * class Username {
+ *  user:string;
+ * }
+ *
+ * ```
+ *
+ * @exportedAs angular2/pipes
+ */
+export class LowerCasePipe extends Pipe {
+  _latestValue: string;
+  constructor() {
+    super();
+    this._latestValue = null;
+  }
+  supports(str): boolean { return isString(str); }
+
+  onDestroy(): void { this._latestValue = null; }
+
+  transform(value: string): string {
+    if (this._latestValue !== value) {
+      this._latestValue = value;
+      return StringWrapper.toLowerCase(value);
+    } else {
+      return this._latestValue;
+    }
+  }
+}
+
+/**
+ * @exportedAs angular2/pipes
+ */
+export class LowerCaseFactory {
+  supports(str): boolean { return isString(str); }
+
+  create(): Pipe { return new LowerCasePipe(); }
+}

modules/angular2/src/change_detection/pipes/uppercase_pipe.ts

@@ -0,0 +1,58 @@
+import {isString, StringWrapper} from 'angular2/src/facade/lang';
+import {Pipe} from './pipe';
+
+// HACK: workaround for Traceur behavior.
+// It expects all transpiled modules to contain this marker.
+// TODO: remove this when we no longer use traceur
+export var __esModule = true;
+
+/**
+ * Implements uppercase transforms to text.
+ *
+ * # Example
+ *
+ * In this example we transform the user text uppercase.
+ *
+ *  ```
+ * @Component({
+ *   selector: "username-cmp"
+ * })
+ * @View({
+ *  inline: "Username: {{ user | uppercase }}"
+ * })
+ * class Username {
+ *  user:string;
+ * }
+ *
+ * ```
+ *
+ * @exportedAs angular2/pipes
+ */
+export class UpperCasePipe extends Pipe {
+  _latestValue: string;
+  constructor() {
+    super();
+    this._latestValue = null;
+  }
+  supports(str): boolean { return isString(str); }
+
+  onDestroy(): void { this._latestValue = null; }
+
+  transform(value: string): string {
+    if (this._latestValue !== value) {
+      this._latestValue = value;
+      return StringWrapper.toUpperCase(value);
+    } else {
+      return this._latestValue;
+    }
+  }
+}
+
+/**
+ * @exportedAs angular2/pipes
+ */
+export class UpperCaseFactory {
+  supports(str): boolean { return isString(str); }
+
+  create(): Pipe { return new UpperCasePipe(); }
+}