mirror of
https://github.com/angular/angular
synced 2026-05-24 09:28:37 +00:00
6c7eb351d4
This commit is a precursor to supporting the partial compilation of components, which leverages some of the compilation infrastructure that is in place for directives. PR Close #39707
48 lines
1.8 KiB
TypeScript
48 lines
1.8 KiB
TypeScript
/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import * as o from '../../output/output_ast';
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/**
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* Creates an array literal expression from the given array, mapping all values to an expression
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* using the provided mapping function. If the array is empty or null, then null is returned.
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*
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* @param values The array to transfer into literal array expression.
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* @param mapper The logic to use for creating an expression for the array's values.
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* @returns An array literal expression representing `values`, or null if `values` is empty or
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* is itself null.
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*/
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export function toOptionalLiteralArray<T>(
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values: T[]|null, mapper: (value: T) => o.Expression): o.LiteralArrayExpr|null {
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if (values === null || values.length === 0) {
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return null;
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}
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return o.literalArr(values.map(value => mapper(value)));
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}
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/**
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* Creates an object literal expression from the given object, mapping all values to an expression
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* using the provided mapping function. If the object has no keys, then null is returned.
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*
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* @param object The object to transfer into an object literal expression.
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* @param mapper The logic to use for creating an expression for the object's values.
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* @returns An object literal expression representing `object`, or null if `object` does not have
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* any keys.
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*/
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export function toOptionalLiteralMap<T>(
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object: {[key: string]: T}, mapper: (value: T) => o.Expression): o.LiteralMapExpr|null {
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const entries = Object.keys(object).map(key => {
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const value = object[key];
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return {key, value: mapper(value), quoted: true};
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});
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if (entries.length > 0) {
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return o.literalMap(entries);
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} else {
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return null;
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}
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}
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