Fediversity/website/node_modules/@hapi/hoek/lib/applyToDefaults.js
2024-11-13 15:47:11 +01:00

103 lines
2.6 KiB
JavaScript
Executable file

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