[FEATURE ember-contextual-components] dot-path

FEATURES.md

@@ -80,3 +80,19 @@ for a detailed explanation.
 * `ember-metal-ember-assign`
 
   Add `Ember.assign` that is polyfill for `Object.assign`.
+
+* `ember-contextual-components`
+
+  Introduce a helper that creates closures over attrs and its own path, then
+  allow the closed over cell to be invoked via the `{{component` helper or
+  any reference with a dot in the path.
+
+  For example:
+
+  ```js
+  {{#with (hash profile=(component "user-profile")) as |userComponents|}}
+    {{userComponents.profile}}
+  {{/with}}
+  ```
+
+  Implements RFC [#64](https://github.com/emberjs/rfcs/blob/master/text/0064-contextual-component-lookup.md)

packages/ember-htmlbars/lib/hooks/component.js

@@ -3,15 +3,21 @@ import ComponentNodeManager from 'ember-htmlbars/node-managers/component-node-ma
 import buildComponentTemplate, { buildHTMLTemplate } from 'ember-views/system/build-component-template';
 import lookupComponent from 'ember-htmlbars/utils/lookup-component';
 import Cache from 'ember-metal/cache';
+import {
+  CONTAINS_DASH_CACHE,
+  CONTAINS_DOT_CACHE
+} from 'ember-htmlbars/system/lookup-helper';
+import {
+  COMPONENT_PATH,
+  COMPONENT_HASH,
+  isComponentCell,
+  mergeHash,
+} from 'ember-htmlbars/keywords/closure-component';
 
 var IS_ANGLE_CACHE = new Cache(1000, function(key) {
   return key.match(/^(@?)<(.*)>$/);
 });
 
-var CONTAINS_DASH = new Cache(1000, function(key) {
-  return key.indexOf('-') !== -1;
-});
-
 export default function componentHook(renderNode, env, scope, _tagName, params, attrs, templates, visitor) {
   var state = renderNode.getState();
 
@@ -22,6 +28,15 @@ export default function componentHook(renderNode, env, scope, _tagName, params,
   }
 
   let tagName = _tagName;
+  if (CONTAINS_DOT_CACHE.get(tagName)) {
+    let stream = env.hooks.get(env, scope, tagName);
+    let componentCell = stream.value();
+    if (isComponentCell(componentCell)) {
+      tagName = componentCell[COMPONENT_PATH];
+      attrs = mergeHash(componentCell[COMPONENT_HASH], attrs);
+    }
+  }
+
   let isAngleBracket = false;
   let isTopLevel = false;
   let isDasherized = false;
@@ -34,7 +49,7 @@ export default function componentHook(renderNode, env, scope, _tagName, params,
     isTopLevel = !!angles[1];
   }
 
-  if (CONTAINS_DASH.get(tagName)) {
+  if (CONTAINS_DASH_CACHE.get(tagName)) {
     isDasherized = true;
   }
 

packages/ember-htmlbars/lib/system/lookup-helper.js

@@ -10,6 +10,10 @@ export var CONTAINS_DASH_CACHE = new Cache(1000, function(key) {
   return key.indexOf('-') !== -1;
 });
 
+export var CONTAINS_DOT_CACHE = new Cache(1000, function(key) {
+  return key.indexOf('.') !== -1;
+});
+
 export function validateLazyHelperName(helperName, container, keywords) {
   return container && !(helperName in keywords);
 }

packages/ember-htmlbars/lib/utils/is-component.js

@@ -3,7 +3,12 @@
 @submodule ember-htmlbars
 */
 
-import { CONTAINS_DASH_CACHE } from 'ember-htmlbars/system/lookup-helper';
+import {
+  CONTAINS_DASH_CACHE,
+  CONTAINS_DOT_CACHE
+} from 'ember-htmlbars/system/lookup-helper';
+import { isComponentCell } from 'ember-htmlbars/keywords/closure-component';
+import { isStream } from 'ember-metal/streams/utils';
 
 /*
  Given a path name, returns whether or not a component with that
@@ -12,7 +17,18 @@ import { CONTAINS_DASH_CACHE } from 'ember-htmlbars/system/lookup-helper';
 export default function isComponent(env, scope, path) {
   var container = env.container;
   if (!container) { return false; }
-  if (!CONTAINS_DASH_CACHE.get(path)) { return false; }
-  return container.registry.has('component:' + path) ||
-         container.registry.has('template:components/' + path);
+  if (typeof path === 'string') {
+    if (CONTAINS_DOT_CACHE.get(path)) {
+      let stream = env.hooks.get(env, scope, path);
+      if (isStream(stream)) {
+        let cell = stream.value();
+        if (isComponentCell(cell)) {
+          return true;
+        }
+      }
+    }
+    if (!CONTAINS_DASH_CACHE.get(path)) { return false; }
+    return container.registry.has('component:' + path) ||
+           container.registry.has('template:components/' + path);
+  }
 }

packages/ember-htmlbars/tests/helpers/closure_component_test.js

@@ -339,4 +339,50 @@ if (isEnabled('ember-contextual-components')) {
       runAppend(component);
     }, `The component helper cannot be used without a valid component name. You used "not-a-component" via (component compName)`);
   });
+
+  QUnit.test('renders with dot path', function() {
+    let expectedText = 'Hodi';
+    registry.register(
+      'template:components/-looked-up',
+      compile(expectedText)
+    );
+
+    let template = compile('{{#with (hash lookedup=(component "-looked-up")) as |object|}}{{object.lookedup}}{{/with}}');
+    component = Component.extend({ container, template }).create();
+
+    runAppend(component);
+    equal(component.$().text(), expectedText, '-looked-up component rendered');
+  });
+
+  QUnit.test('renders with dot path and attr', function() {
+    let expectedText = 'Hodi';
+    registry.register(
+      'template:components/-looked-up',
+      compile('{{expectedText}}')
+    );
+
+    let template = compile('{{#with (hash lookedup=(component "-looked-up")) as |object|}}{{object.lookedup expectedText=expectedText}}{{/with}}');
+    component = Component.extend({ container, template }).create({
+      expectedText
+    });
+
+    runAppend(component);
+    equal(component.$().text(), expectedText, '-looked-up component rendered');
+  });
+
+  QUnit.test('renders with dot path curried over attr', function() {
+    let expectedText = 'Hodi';
+    registry.register(
+      'template:components/-looked-up',
+      compile('{{expectedText}}')
+    );
+
+    let template = compile('{{#with (hash lookedup=(component "-looked-up" expectedText=expectedText)) as |object|}}{{object.lookedup}}{{/with}}');
+    component = Component.extend({ container, template }).create({
+      expectedText
+    });
+
+    runAppend(component);
+    equal(component.$().text(), expectedText, '-looked-up component rendered');
+  });
 }