84 lines
1.9 KiB
JavaScript
84 lines
1.9 KiB
JavaScript
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/*!
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* set-getter (https://github.com/doowb/set-getter)
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*
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* Copyright (c) 2016, Brian Woodward.
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* Licensed under the MIT License.
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*/
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'use strict';
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var toPath = require('to-object-path');
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/**
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* Defines a getter function on an object using property path notation.
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*
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* ```js
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* var obj = {};
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* getter(obj, 'foo', function() {
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* return 'bar';
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* });
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* ```
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* @param {Object} `obj` Object to add property to.
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* @param {String|Array} `prop` Property string or array to add.
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* @param {Function} `getter` Getter function to add as a property.
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* @api public
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*/
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function setGetter(obj, prop, getter) {
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var key = toPath(arguments);
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return define(obj, key, getter);
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}
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/**
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* Define getter function on object or object hierarchy using dot notation.
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*
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* @param {Object} `obj` Object to define getter property on.
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* @param {String} `prop` Property string to define.
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* @param {Function} `getter` Getter function to define.
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* @return {Object} Returns original object.
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*/
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function define(obj, prop, getter) {
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if (!~prop.indexOf('.')) {
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defineProperty(obj, prop, getter);
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return obj;
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}
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var keys = prop.split('.');
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var last = keys.pop();
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var target = obj;
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var key;
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while ((key = keys.shift())) {
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while (key.slice(-1) === '\\') {
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key = key.slice(0, -1) + '.' + keys.shift();
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}
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target = target[key] || (target[key] = {});
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}
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defineProperty(target, last, getter);
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return obj;
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}
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/**
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* Define getter function on object as a configurable and enumerable property.
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*
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* @param {Object} `obj` Object to define property on.
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* @param {String} `prop` Property to define.
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* @param {Function} `getter` Getter function to define.
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*/
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function defineProperty(obj, prop, getter) {
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Object.defineProperty(obj, prop, {
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configurable: true,
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enumerable: true,
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get: getter
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});
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}
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/**
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* Expose `setGetter`
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*/
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module.exports = setGetter;
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