53 lines
1.5 KiB
JavaScript
53 lines
1.5 KiB
JavaScript
/*jslint unparam: true, vars: true, white: true, newcap: true, nomen: true, plusplus: true, maxerr: 50, indent: 4 */
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/*global window*/
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// Dictionaries. We need this due to JS weirdness, since object
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// literals have issues with regards to magic properties like
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// __proto__. This is taken from Effective JavaScript, Item 45.
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(function (baselib) {
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'use strict';
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var hasOwnProperty = {}.hasOwnProperty;
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baselib.Dict = function(elements) {
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this.elements = elements || {};
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this.hasSpecialProto = false;
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this.specialProto = undefined;
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};
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baselib.Dict.prototype.has = function(key) {
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if (key === '__proto__') {
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return this.hasSpecialProto;
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}
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return hasOwnProperty.call(this.elements, key);
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};
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baselib.Dict.prototype.get = function(key) {
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if (key === '__proto__') {
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return this.specialProto;
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} else if (hasOwnProperty.call(this.elements, key)) {
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return this.elements[key];
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} else {
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return undefined;
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}
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};
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baselib.Dict.prototype.set = function(key, val) {
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if (key === '__proto__') {
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this.hasSpecialProto = true;
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this.specialProto = val;
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} else {
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this.elements[key] = val;
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}
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};
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baselib.Dict.prototype.remove = function(key) {
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if (key === '__proto__') {
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this.hasSpecialProto = false;
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this.specialProto = undefined;
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} else {
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delete this.elements[key];
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}
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};
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}(window.plt.baselib)); |