103 lines
2.6 KiB
JavaScript
103 lines
2.6 KiB
JavaScript
'use strict';
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const Assert = require('./assert');
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const Clone = require('./clone');
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const Merge = require('./merge');
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const Reach = require('./reach');
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const internals = {};
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module.exports = function (defaults, source, options = {}) {
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Assert(defaults && typeof defaults === 'object', 'Invalid defaults value: must be an object');
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Assert(!source || source === true || typeof source === 'object', 'Invalid source value: must be true, falsy or an object');
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Assert(typeof options === 'object', 'Invalid options: must be an object');
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if (!source) { // If no source, return null
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return null;
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}
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if (options.shallow) {
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return internals.applyToDefaultsWithShallow(defaults, source, options);
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}
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const copy = Clone(defaults);
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if (source === true) { // If source is set to true, use defaults
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return copy;
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}
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const nullOverride = options.nullOverride !== undefined ? options.nullOverride : false;
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return Merge(copy, source, { nullOverride, mergeArrays: false });
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};
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internals.applyToDefaultsWithShallow = function (defaults, source, options) {
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const keys = options.shallow;
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Assert(Array.isArray(keys), 'Invalid keys');
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const seen = new Map();
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const merge = source === true ? null : new Set();
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for (let key of keys) {
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key = Array.isArray(key) ? key : key.split('.'); // Pre-split optimization
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const ref = Reach(defaults, key);
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if (ref &&
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typeof ref === 'object') {
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seen.set(ref, merge && Reach(source, key) || ref);
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}
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else if (merge) {
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merge.add(key);
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}
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}
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const copy = Clone(defaults, {}, seen);
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if (!merge) {
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return copy;
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}
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for (const key of merge) {
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internals.reachCopy(copy, source, key);
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}
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const nullOverride = options.nullOverride !== undefined ? options.nullOverride : false;
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return Merge(copy, source, { nullOverride, mergeArrays: false });
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};
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internals.reachCopy = function (dst, src, path) {
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for (const segment of path) {
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if (!(segment in src)) {
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return;
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}
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const val = src[segment];
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if (typeof val !== 'object' || val === null) {
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return;
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}
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src = val;
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}
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const value = src;
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let ref = dst;
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for (let i = 0; i < path.length - 1; ++i) {
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const segment = path[i];
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if (typeof ref[segment] !== 'object') {
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ref[segment] = {};
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}
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ref = ref[segment];
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}
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ref[path[path.length - 1]] = value;
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};
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