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54 lines
1.4 KiB
54 lines
1.4 KiB
3 years ago
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// @flow
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import refProperties from './util/ref_properties.js';
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import type {LayerSpecification} from './types.js';
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function deref(layer: LayerSpecification, parent: LayerSpecification): LayerSpecification {
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const result = {};
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for (const k in layer) {
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if (k !== 'ref') {
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result[k] = layer[k];
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}
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}
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refProperties.forEach((k) => {
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if (k in parent) {
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result[k] = (parent: any)[k];
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}
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});
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return ((result: any): LayerSpecification);
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}
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/**
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* Given an array of layers, some of which may contain `ref` properties
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* whose value is the `id` of another property, return a new array where
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* such layers have been augmented with the 'type', 'source', etc. properties
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* from the parent layer, and the `ref` property has been removed.
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*
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* The input is not modified. The output may contain references to portions
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* of the input.
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*
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* @private
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* @param {Array<Layer>} layers
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* @returns {Array<Layer>}
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*/
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export default function derefLayers(layers: Array<LayerSpecification>): Array<LayerSpecification> {
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layers = layers.slice();
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const map = Object.create(null);
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for (let i = 0; i < layers.length; i++) {
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map[layers[i].id] = layers[i];
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}
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for (let i = 0; i < layers.length; i++) {
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if ('ref' in layers[i]) {
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layers[i] = deref(layers[i], map[(layers[i]: any).ref]);
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}
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}
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return layers;
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}
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