| 1 | //- JavaScript source code
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| 2 |
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| 3 | //- configure.js ~~
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| 4 | // ~~ (c) SRW, 17 Dec 2012
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| 5 | // ~~ last updated 14 Mar 2014
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| 6 |
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| 7 | (function () {
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| 8 | ;
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| 9 |
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| 10 | // Pragmas
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| 11 |
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| 12 | /*jshint maxparams: 2, quotmark: single, strict: true */
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| 13 |
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| 14 | /*jslint indent: 4, maxlen: 80, node: true */
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| 15 |
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| 16 | /*properties exports, hasOwnProperty */
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| 17 |
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| 18 | // Out-of-scope definitions
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| 19 |
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| 20 | module.exports = function configure(user_input, default_values) {
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| 21 | // This function deep-copies the properties of the `default_values` object
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| 22 | // onto a fresh output object `y` recursively, but it will prefer to copy
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| 23 | // a property from the `user_input` object when available.
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| 24 | if ((user_input instanceof Object) === false) {
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| 25 | user_input = {};
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| 26 | }
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| 27 | var key, y;
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| 28 | y = (default_values instanceof Array) ? [] : user_input;
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| 29 | for (key in default_values) {
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| 30 | if (default_values.hasOwnProperty(key)) {
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| 31 | if ((default_values[key] instanceof Object) &&
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| 32 | (typeof default_values[key] !== 'function')) {
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| 33 | y[key] = configure(user_input[key], default_values[key]);
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| 34 | } else if (user_input.hasOwnProperty(key)) {
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| 35 | y[key] = user_input[key];
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| 36 | } else {
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| 37 | y[key] = default_values[key];
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| 38 | }
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| 39 | }
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| 40 | }
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| 41 | return y;
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| 42 | };
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| 43 |
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| 44 | // That's all, folks!
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| 45 |
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| 46 | return;
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| 47 |
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| 48 | }());
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| 49 |
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| 50 | //- vim:set syntax=javascript:
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