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directive_resolver.ts
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directive_resolver.ts
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import {resolveForwardRef, Injectable} from 'angular2/src/core/di';
import {Type, isPresent, isBlank, stringify} from 'angular2/src/facade/lang';
import {BaseException} from 'angular2/src/facade/exceptions';
import {ListWrapper, StringMapWrapper} from 'angular2/src/facade/collection';
import {
DirectiveMetadata,
ComponentMetadata,
InputMetadata,
OutputMetadata,
HostBindingMetadata,
HostListenerMetadata,
ContentChildrenMetadata,
ViewChildrenMetadata,
ContentChildMetadata,
ViewChildMetadata
} from 'angular2/src/core/metadata';
import {reflector} from 'angular2/src/core/reflection/reflection';
function _isDirectiveMetadata(type: any): boolean {
return type instanceof DirectiveMetadata;
}
/*
* Resolve a `Type` for {@link DirectiveMetadata}.
*
* This interface can be overridden by the application developer to create custom behavior.
*
* See {@link Compiler}
*/
@Injectable()
export class DirectiveResolver {
/**
* Return {@link DirectiveMetadata} for a given `Type`.
*/
resolve(type: Type): DirectiveMetadata {
var typeMetadata = reflector.annotations(resolveForwardRef(type));
if (isPresent(typeMetadata)) {
var metadata = typeMetadata.find(_isDirectiveMetadata);
if (isPresent(metadata)) {
var propertyMetadata = reflector.propMetadata(type);
return this._mergeWithPropertyMetadata(metadata, propertyMetadata, type);
}
}
throw new BaseException(`No Directive annotation found on ${stringify(type)}`);
}
private _mergeWithPropertyMetadata(dm: DirectiveMetadata,
propertyMetadata: {[key: string]: any[]},
directiveType: Type): DirectiveMetadata {
var inputs = [];
var outputs = [];
var host: {[key: string]: string} = {};
var queries: {[key: string]: any} = {};
StringMapWrapper.forEach(propertyMetadata, (metadata: any[], propName: string) => {
metadata.forEach(a => {
if (a instanceof InputMetadata) {
if (isPresent(a.bindingPropertyName)) {
inputs.push(`${propName}: ${a.bindingPropertyName}`);
} else {
inputs.push(propName);
}
}
if (a instanceof OutputMetadata) {
if (isPresent(a.bindingPropertyName)) {
outputs.push(`${propName}: ${a.bindingPropertyName}`);
} else {
outputs.push(propName);
}
}
if (a instanceof HostBindingMetadata) {
if (isPresent(a.hostPropertyName)) {
host[`[${a.hostPropertyName}]`] = propName;
} else {
host[`[${propName}]`] = propName;
}
}
if (a instanceof HostListenerMetadata) {
var args = isPresent(a.args) ? (<any[]>a.args).join(', ') : '';
host[`(${a.eventName})`] = `${propName}(${args})`;
}
if (a instanceof ContentChildrenMetadata) {
queries[propName] = a;
}
if (a instanceof ViewChildrenMetadata) {
queries[propName] = a;
}
if (a instanceof ContentChildMetadata) {
queries[propName] = a;
}
if (a instanceof ViewChildMetadata) {
queries[propName] = a;
}
});
});
return this._merge(dm, inputs, outputs, host, queries, directiveType);
}
private _merge(dm: DirectiveMetadata, inputs: string[], outputs: string[],
host: {[key: string]: string}, queries: {[key: string]: any},
directiveType: Type): DirectiveMetadata {
var mergedInputs = isPresent(dm.inputs) ? ListWrapper.concat(dm.inputs, inputs) : inputs;
var mergedOutputs;
if (isPresent(dm.outputs)) {
dm.outputs.forEach((propName: string) => {
if (ListWrapper.contains(outputs, propName)) {
throw new BaseException(
`Output event '${propName}' defined multiple times in '${stringify(directiveType)}'`);
}
});
mergedOutputs = ListWrapper.concat(dm.outputs, outputs);
} else {
mergedOutputs = outputs;
}
var mergedHost = isPresent(dm.host) ? StringMapWrapper.merge(dm.host, host) : host;
var mergedQueries =
isPresent(dm.queries) ? StringMapWrapper.merge(dm.queries, queries) : queries;
if (dm instanceof ComponentMetadata) {
return new ComponentMetadata({
selector: dm.selector,
inputs: mergedInputs,
outputs: mergedOutputs,
host: mergedHost,
exportAs: dm.exportAs,
moduleId: dm.moduleId,
queries: mergedQueries,
changeDetection: dm.changeDetection,
providers: dm.providers,
viewProviders: dm.viewProviders
});
} else {
return new DirectiveMetadata({
selector: dm.selector,
inputs: mergedInputs,
outputs: mergedOutputs,
host: mergedHost,
exportAs: dm.exportAs,
moduleId: dm.moduleId,
queries: mergedQueries,
providers: dm.providers
});
}
}
}