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feat(decorators): adds support for parameter decorators.

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Paramater decorators expect to be called as currently implemented by TS.
This commit is contained in:
Rado Kirov
2015-04-29 16:22:38 -07:00
parent e4342743c0
commit f863ea0db5
5 changed files with 182 additions and 17 deletions
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43
modules/angular2/src/core/decorators/decorators.es6
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@ -5,12 +5,15 @@ import {
import {ViewAnnotation} from '../annotations/view';
import {AncestorAnnotation, ParentAnnotation} from '../annotations/visibility';
import {AttributeAnnotation, QueryAnnotation} from '../annotations/di';
import {global} from 'angular2/src/facade/lang';
function makeDecorator(annotationCls) {
return function(...args) {
if (!(window.Reflect && window.Reflect.getMetadata)) throw 'reflect-metadata shim is required';
var Reflect = global.Reflect;
if (!(Reflect && Reflect.getMetadata)) {
throw 'reflect-metadata shim is required when using class decorators';
}
var annotationInstance = new annotationCls(...args);
var Reflect = window.Reflect;
return function(cls) {
var annotations = Reflect.getMetadata('annotations', cls);
annotations = annotations || [];
@ -21,17 +24,39 @@ function makeDecorator(annotationCls) {
}
}
function makeParamDecorator(annotationCls) {
return function(...args) {
var Reflect = global.Reflect;
if (!(Reflect && Reflect.getMetadata)) {
throw 'reflect-metadata shim is required when using parameter decorators';
}
var annotationInstance = new annotationCls(...args);
return function(cls, unusedKey, index) {
var parameters = Reflect.getMetadata('parameters', cls);
parameters = parameters || [];
// there might be gaps if some in between parameters do not have annotations.
// we pad with nulls.
while (parameters.length <= index) {
parameters.push(null);
}
parameters[index] = annotationInstance;
Reflect.defineMetadata('parameters', parameters, cls);
return cls;
}
}
}
/* from annotations */
export var Component = makeDecorator(ComponentAnnotation);
export var Decorator = makeDecorator(DirectiveAnnotation);
/* from di */
export var Attribute = makeDecorator(AttributeAnnotation);
export var Query = makeDecorator(QueryAnnotation);
/* from view */
export var View = makeDecorator(ViewAnnotation);
/* from visiblity */
export var Ancestor = makeDecorator(AncestorAnnotation);
export var Parent = makeDecorator(ParentAnnotation);
/* from visibility */
export var Ancestor = makeParamDecorator(AncestorAnnotation);
export var Parent = makeParamDecorator(ParentAnnotation);
/* from di */
export var Attribute = makeParamDecorator(AttributeAnnotation);
export var Query = makeParamDecorator(QueryAnnotation);