repackaging: all the file moves

modules/@angular/common/src/directives/ng_if.ts

@@ -0,0 +1,42 @@
+import {Directive, ViewContainerRef, TemplateRef} from 'angular2/core';
+import {isBlank} from 'angular2/src/facade/lang';
+
+/**
+ * Removes or recreates a portion of the DOM tree based on an {expression}.
+ *
+ * If the expression assigned to `ngIf` evaluates to a false value then the element
+ * is removed from the DOM, otherwise a clone of the element is reinserted into the DOM.
+ *
+ * ### Example ([live demo](http://plnkr.co/edit/fe0kgemFBtmQOY31b4tw?p=preview)):
+ *
+ * ```
+ * <div *ngIf="errorCount > 0" class="error">
+ *   <!-- Error message displayed when the errorCount property on the current context is greater
+ * than 0. -->
+ *   {{errorCount}} errors detected
+ * </div>
+ * ```
+ *
+ * ### Syntax
+ *
+ * - `<div *ngIf="condition">...</div>`
+ * - `<div template="ngIf condition">...</div>`
+ * - `<template [ngIf]="condition"><div>...</div></template>`
+ */
+@Directive({selector: '[ngIf]', inputs: ['ngIf']})
+export class NgIf {
+  private _prevCondition: boolean = null;
+
+  constructor(private _viewContainer: ViewContainerRef, private _templateRef: TemplateRef<Object>) {
+  }
+
+  set ngIf(newCondition: any /* boolean */) {
+    if (newCondition && (isBlank(this._prevCondition) || !this._prevCondition)) {
+      this._prevCondition = true;
+      this._viewContainer.createEmbeddedView(this._templateRef);
+    } else if (!newCondition && (isBlank(this._prevCondition) || this._prevCondition)) {
+      this._prevCondition = false;
+      this._viewContainer.clear();
+    }
+  }
+}