8aa3fcfb63
But do it during the build process for cjs. Right now we only need this when we transpile from ts directly to es5. This is only the case in our cis build, as for our browser build we only transpile from ts to es6 via ts and then use traceur to do the rest.
39 lines
782 B
TypeScript
39 lines
782 B
TypeScript
import {isBlank, CONST} from 'angular2/src/facade/lang';
|
|
import {Pipe, WrappedValue, PipeFactory} from './pipe';
|
|
|
|
/**
|
|
* @exportedAs angular2/pipes
|
|
*/
|
|
@CONST()
|
|
export class NullPipeFactory extends PipeFactory {
|
|
constructor() { super(); }
|
|
|
|
supports(obj): boolean { return NullPipe.supportsObj(obj); }
|
|
|
|
create(cdRef): Pipe { return new NullPipe(); }
|
|
}
|
|
|
|
/**
|
|
* @exportedAs angular2/pipes
|
|
*/
|
|
export class NullPipe extends Pipe {
|
|
called: boolean;
|
|
constructor() {
|
|
super();
|
|
this.called = false;
|
|
}
|
|
|
|
static supportsObj(obj): boolean { return isBlank(obj); }
|
|
|
|
supports(obj) { return NullPipe.supportsObj(obj); }
|
|
|
|
transform(value) {
|
|
if (!this.called) {
|
|
this.called = true;
|
|
return WrappedValue.wrap(null);
|
|
} else {
|
|
return null;
|
|
}
|
|
}
|
|
}
|