Adding Angular and dependent packages for testing

third_party/pkg/angular/lib/directive/ng_src_boolean.dart

+part of angular.directive;
+
+/**
+ * Allows adding and removing the boolean attributes from the element.
+ *
+ * Using `<button disabled="{{false}}">` does not work since it would result
+ * in `<button disabled="false">` rather than `<button>`.
+ * Browsers change behavior based on presence/absence of attribute rather the
+ * its value.
+ *
+ * For this reason we provide alternate `ng-`attribute directives to
+ * add/remove boolean attributes such as `<button ng-disabled="{{false}}">`
+ * which will result in proper removal of the attribute.
+ *
+ * The full list of supported attributes are:
+ *
+ *  - [ng-checked]
+ *  - [ng-disabled]
+ *  - [ng-multiple]
+ *  - [ng-open]
+ *  - [ng-readonly]
+ *  - [ng-required]
+ *  - [ng-selected]
+ */
+@NgDirective(selector: '[ng-checked]',  map: const {'ng-checked':  '=>checked'})
+@NgDirective(selector: '[ng-disabled]', map: const {'ng-disabled': '=>disabled'})
+@NgDirective(selector: '[ng-multiple]', map: const {'ng-multiple': '=>multiple'})
+@NgDirective(selector: '[ng-open]',     map: const {'ng-open':     '=>open'})
+@NgDirective(selector: '[ng-readonly]', map: const {'ng-readonly': '=>readonly'})
+@NgDirective(selector: '[ng-required]', map: const {'ng-required': '=>required'})
+@NgDirective(selector: '[ng-selected]', map: const {'ng-selected': '=>selected'})
+class NgBooleanAttributeDirective {
+  NodeAttrs attrs;
+  NgBooleanAttributeDirective(this.attrs);
+
+  _setBooleanAttribute(name, value) => attrs[name] = (toBool(value) ? '' : null);
+
+  set checked(value)   => _setBooleanAttribute('checked',  value);
+  set disabled(value)  => _setBooleanAttribute('disabled', value);
+  set multiple(value)  => _setBooleanAttribute('multiple', value);
+  set open(value)      => _setBooleanAttribute('open',     value);
+  set readonly(value)  => _setBooleanAttribute('readonly', value);
+  set required(value)  => _setBooleanAttribute('required', value);
+  set selected(value)  => _setBooleanAttribute('selected', value);
+}
+
+/**
+ * In browser some attributes have network side-effect. If the attribute
+ * has `{{interpolation}}` in it it may cause browser to fetch bogus URLs.
+ *
+ * Example: In `<img src="{{username}}.png">` the browser will fetch the image
+ * `http://server/{{username}}.png` before Angular has a chance to replace the
+ * attribute with data-bound url.
+ *
+ * For this reason we provide `ng-`prefixed attributes which avoid the issues
+ * mentioned above as in this example: `<img ng-src="{{username}}.png">`.
+ *
+ * The full list of supported attributes are:
+ *
+ * - [ng-href]
+ * - [ng-src]
+ * - [ng-srcset]
+ */
+@NgDirective(selector: '[ng-href]',   map: const {'ng-href':   '@href'})
+@NgDirective(selector: '[ng-src]',    map: const {'ng-src':    '@src'})
+@NgDirective(selector: '[ng-srcset]', map: const {'ng-srcset': '@srcset'})
+class NgSourceDirective {
+  NodeAttrs attrs;
+  NgSourceDirective(this.attrs);
+
+  set href(value)   => attrs['href']   = value;
+  set src(value)    => attrs['src']    = value;
+  set srcset(value) => attrs['srcset'] = value;
+
+}