49 lines
1.2 KiB
JavaScript
49 lines
1.2 KiB
JavaScript
import { reach } from './reach.js';
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/**
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* Transform an object or collection to a different form.
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*
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* @param {Object} source The object to transform.
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* @param {Object} map Object that describes how to transform the source: { [path.in.transformed.object]: [path.in.source] }.
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* @return {Object} A new object with the new structure.
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*/
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export const transform = (source, map) => {
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const sep = '.';
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if (Array.isArray(source)) {
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const results = [];
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for (let i = 0; i < source.length; ++i) {
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results.push(transform(source[i], map));
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}
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return results;
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}
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const result = {};
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const keys = Object.keys(map);
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for (let i = 0, li = keys.length; i < li; ++i) {
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const key = keys[i];
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const path = key.split(sep);
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const srcPath = map[key];
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if (typeof srcPath !== 'string') {
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console.warn('Transformation path invalid. Skipping.');
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continue;
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}
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let segment;
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let res = result;
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while (path.length > 1) {
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segment = path.shift();
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if (!res[segment]) {
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res[segment] = {};
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}
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res = res[segment];
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}
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segment = path.shift();
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res[segment] = reach(srcPath, source);
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}
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return result;
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} |