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base_def.ts
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/
base_def.ts
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/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import {ConstantPool, R3BaseRefMetaData, compileBaseDefFromMetadata, makeBindingParser} from '@angular/compiler';
import {Reference} from '../../imports';
import {MetadataRegistry} from '../../metadata';
import {PartialEvaluator} from '../../partial_evaluator';
import {ClassDeclaration, ClassMember, Decorator, ReflectionHost} from '../../reflection';
import {AnalysisOutput, CompileResult, DecoratorHandler, DetectResult, HandlerPrecedence} from '../../transform';
import {extractHostBindings, queriesFromFields} from './directive';
import {isAngularDecorator, readBaseClass} from './util';
function containsNgTopLevelDecorator(decorators: Decorator[] | null, isCore: boolean): boolean {
if (!decorators) {
return false;
}
return decorators.some(
decorator => isAngularDecorator(decorator, 'Component', isCore) ||
isAngularDecorator(decorator, 'Directive', isCore) ||
isAngularDecorator(decorator, 'NgModule', isCore));
}
export class BaseDefDecoratorHandler implements
DecoratorHandler<R3BaseRefMetaData, R3BaseRefDecoratorDetection> {
constructor(
private reflector: ReflectionHost, private evaluator: PartialEvaluator,
private metaRegistry: MetadataRegistry, private isCore: boolean) {}
readonly precedence = HandlerPrecedence.WEAK;
detect(node: ClassDeclaration, decorators: Decorator[]|null):
DetectResult<R3BaseRefDecoratorDetection>|undefined {
if (containsNgTopLevelDecorator(decorators, this.isCore)) {
// If the class is already decorated by @Component or @Directive let that
// DecoratorHandler handle this. BaseDef is unnecessary.
return undefined;
}
let result: R3BaseRefDecoratorDetection|undefined = undefined;
this.reflector.getMembersOfClass(node).forEach(property => {
const {decorators} = property;
if (!decorators) {
return;
}
for (const decorator of decorators) {
if (isAngularDecorator(decorator, 'Input', this.isCore)) {
result = result || {};
const inputs = result.inputs = result.inputs || [];
inputs.push({decorator, property});
} else if (isAngularDecorator(decorator, 'Output', this.isCore)) {
result = result || {};
const outputs = result.outputs = result.outputs || [];
outputs.push({decorator, property});
} else if (
isAngularDecorator(decorator, 'ViewChild', this.isCore) ||
isAngularDecorator(decorator, 'ViewChildren', this.isCore)) {
result = result || {};
const viewQueries = result.viewQueries = result.viewQueries || [];
viewQueries.push({member: property, decorators});
} else if (
isAngularDecorator(decorator, 'ContentChild', this.isCore) ||
isAngularDecorator(decorator, 'ContentChildren', this.isCore)) {
result = result || {};
const queries = result.queries = result.queries || [];
queries.push({member: property, decorators});
} else if (
isAngularDecorator(decorator, 'HostBinding', this.isCore) ||
isAngularDecorator(decorator, 'HostListener', this.isCore)) {
result = result || {};
const host = result.host = result.host || [];
host.push(property);
}
}
});
if (result !== undefined) {
return {
metadata: result,
trigger: null,
};
} else {
return undefined;
}
}
analyze(node: ClassDeclaration, metadata: R3BaseRefDecoratorDetection):
AnalysisOutput<R3BaseRefMetaData> {
const analysis: R3BaseRefMetaData = {name: node.name.text, typeSourceSpan: null !};
if (metadata.inputs) {
const inputs = analysis.inputs = {} as{[key: string]: string | [string, string]};
metadata.inputs.forEach(({decorator, property}) => {
const propName = property.name;
const args = decorator.args;
let value: string|[string, string];
if (args && args.length > 0) {
const resolvedValue = this.evaluator.evaluate(args[0]);
if (typeof resolvedValue !== 'string') {
throw new TypeError('Input alias does not resolve to a string value');
}
value = [resolvedValue, propName];
} else {
value = propName;
}
inputs[propName] = value;
});
}
if (metadata.outputs) {
const outputs = analysis.outputs = {} as{[key: string]: string};
metadata.outputs.forEach(({decorator, property}) => {
const propName = property.name;
const args = decorator.args;
let value: string;
if (args && args.length > 0) {
const resolvedValue = this.evaluator.evaluate(args[0]);
if (typeof resolvedValue !== 'string') {
throw new TypeError('Output alias does not resolve to a string value');
}
value = resolvedValue;
} else {
value = propName;
}
outputs[propName] = value;
});
}
if (metadata.viewQueries) {
analysis.viewQueries =
queriesFromFields(metadata.viewQueries, this.reflector, this.evaluator);
}
if (metadata.queries) {
analysis.queries = queriesFromFields(metadata.queries, this.reflector, this.evaluator);
}
if (metadata.host) {
analysis.host = extractHostBindings(
metadata.host, this.evaluator, this.isCore ? undefined : '@angular/core');
}
this.metaRegistry.registerBaseMetadata({
ref: new Reference(node),
inputs: analysis.inputs || {},
outputs: analysis.outputs || {},
baseClass: readBaseClass(node, this.reflector, this.evaluator),
});
return {analysis};
}
compile(node: ClassDeclaration, analysis: R3BaseRefMetaData, pool: ConstantPool):
CompileResult[]|CompileResult {
const {expression, type} = compileBaseDefFromMetadata(analysis, pool, makeBindingParser());
return {
name: 'ngBaseDef',
initializer: expression, type,
statements: [],
};
}
}
export interface R3BaseRefDecoratorDetection {
inputs?: {property: ClassMember, decorator: Decorator}[];
outputs?: {property: ClassMember, decorator: Decorator}[];
viewQueries?: {member: ClassMember, decorators: Decorator[]}[];
queries?: {member: ClassMember, decorators: Decorator[]}[];
host?: ClassMember[];
}