71 lines
1.9 KiB
JavaScript
71 lines
1.9 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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function OptionsDefaulter() {
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this.defaults = {};
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this.config = {};
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}
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module.exports = OptionsDefaulter;
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function getProperty(obj, name) {
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name = name.split(".");
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for(var i = 0; i < name.length - 1; i++) {
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obj = obj[name[i]];
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if(typeof obj !== "object" || !obj) return;
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}
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return obj[name.pop()];
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}
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function setProperty(obj, name, value) {
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name = name.split(".");
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for(var i = 0; i < name.length - 1; i++) {
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if(typeof obj[name[i]] !== "object" && typeof obj[name[i]] !== "undefined") return;
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if(!obj[name[i]]) obj[name[i]] = {};
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obj = obj[name[i]];
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}
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obj[name.pop()] = value;
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}
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OptionsDefaulter.prototype.process = function(options) {
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var addItemTo = function addItemTo(list) {
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return function(item) {
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list.push(item);
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}
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}
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for(var name in this.defaults) {
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switch(this.config[name]) {
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case undefined:
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if(getProperty(options, name) === undefined)
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setProperty(options, name, this.defaults[name]);
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break;
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case "call":
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setProperty(options, name, this.defaults[name].call(this, getProperty(options, name), options), options);
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break;
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case "make":
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if(getProperty(options, name) === undefined)
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setProperty(options, name, this.defaults[name].call(this, options), options);
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break;
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case "append":
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var oldValue = getProperty(options, name);
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if(!Array.isArray(oldValue)) oldValue = [];
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this.defaults[name].forEach(addItemTo(oldValue));
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setProperty(options, name, oldValue);
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break;
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default:
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throw new Error("OptionsDefaulter cannot process " + this.config[name]);
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}
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}
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};
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OptionsDefaulter.prototype.set = function(name, config, def) {
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if(arguments.length === 3) {
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this.defaults[name] = def;
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this.config[name] = config;
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} else {
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this.defaults[name] = config;
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delete this.config[name];
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}
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};
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