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80 lines
2.6 KiB
JavaScript
80 lines
2.6 KiB
JavaScript
/**
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* empower-core - Power Assert feature enhancer for assert function/object.
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*
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* https://github.com/twada/empower-core
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*
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* Copyright (c) 2013-2016 Takuto Wada
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* Licensed under the MIT license.
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* https://github.com/twada/empower-core/blob/master/MIT-LICENSE.txt
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*/
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var create = require('core-js/library/fn/object/create');
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var extend = require('xtend/mutable');
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var defaultOptions = require('./lib/default-options');
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var Decorator = require('./lib/decorator');
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var define = require('./lib/define-properties');
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var slice = Array.prototype.slice;
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/**
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* Enhance Power Assert feature to assert function/object.
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* @param assert target assert function or object to enhance
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* @param options enhancement options
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* @return enhanced assert function/object
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*/
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function empowerCore (assert, options) {
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var typeOfAssert = (typeof assert);
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var enhancedAssert;
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if ((typeOfAssert !== 'object' && typeOfAssert !== 'function') || assert === null) {
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throw new TypeError('empower-core argument should be a function or object.');
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}
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if (isEmpowered(assert)) {
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return assert;
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}
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switch (typeOfAssert) {
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case 'function':
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enhancedAssert = empowerAssertFunction(assert, options);
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break;
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case 'object':
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enhancedAssert = empowerAssertObject(assert, options);
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break;
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default:
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throw new Error('Cannot be here');
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}
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define(enhancedAssert, { _empowered: true });
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return enhancedAssert;
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}
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function empowerAssertObject (assertObject, options) {
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var config = extend(defaultOptions(), options);
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var target = config.destructive ? assertObject : create(assertObject);
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var decorator = new Decorator(target, config);
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return extend(target, decorator.enhancement());
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}
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function empowerAssertFunction (assertFunction, options) {
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var config = extend(defaultOptions(), options);
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if (config.destructive) {
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throw new Error('cannot use destructive:true to function.');
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}
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var decorator = new Decorator(assertFunction, config);
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var enhancement = decorator.enhancement();
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var powerAssert;
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if (typeof enhancement === 'function') {
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powerAssert = function powerAssert () {
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return enhancement.apply(null, slice.apply(arguments));
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};
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} else {
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powerAssert = function powerAssert () {
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return assertFunction.apply(null, slice.apply(arguments));
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};
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}
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extend(powerAssert, assertFunction);
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return extend(powerAssert, enhancement);
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}
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function isEmpowered (assertObjectOrFunction) {
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return assertObjectOrFunction._empowered;
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}
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empowerCore.defaultOptions = defaultOptions;
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module.exports = empowerCore;
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