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• .. (вверх)
• [DIR] ..
• [FILE] CapabilityDetector.js
• [FILE] definitions.js
• [FILE] index.js

Просмотр файла: CapabilityDetector.js

var CapabilityDetector = function () {
    this.tests = {};
    this.cache = {};
};
CapabilityDetector.prototype = {
    constructor: CapabilityDetector,
    define: function (name, test) {
        if (typeof (name) != "string" || !(test instanceof Function))
            throw new Error("Invalid capability definition.");
        if (this.tests[name])
            throw new Error('Duplicated capability definition by "' + name + '".');
        this.tests[name] = test;
    },
    check: function (name) {
        if (!this.test(name))
            throw new Error('The current environment does not support "' + name + '", therefore we cannot continue.');
    },
    test: function (name) {
        if (this.cache[name] !== undefined)
            return this.cache[name];
        if (!this.tests[name])
            throw new Error('Unknown capability with name "' + name + '".');
        var test = this.tests[name];
        this.cache[name] = !!test();
        return this.cache[name];
    }
};

module.exports = CapabilityDetector;

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