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/*!
* Chai - addMethod utility
* Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
* MIT Licensed
*/
var addLengthGuard = require('./addLengthGuard');
var chai = require('../../chai');
var flag = require('./flag');
var proxify = require('./proxify');
var transferFlags = require('./transferFlags');
/**
* ### .addMethod(ctx, name, method)
*
* Adds a method to the prototype of an object.
*
* utils.addMethod(chai.Assertion.prototype, 'foo', function (str) {
* var obj = utils.flag(this, 'object');
* new chai.Assertion(obj).to.be.equal(str);
* });
*
* Can also be accessed directly from `chai.Assertion`.
*
* chai.Assertion.addMethod('foo', fn);
*
* Then can be used as any other assertion.
*
* expect(fooStr).to.be.foo('bar');
*
* @param {Object} ctx object to which the method is added
* @param {String} name of method to add
* @param {Function} method function to be used for name
* @namespace Utils
* @name addMethod
* @api public
*/
module.exports = function addMethod(ctx, name, method) {
var methodWrapper = function () {
// Setting the `ssfi` flag to `methodWrapper` causes this function to be the
// starting point for removing implementation frames from the stack trace of
// a failed assertion.
//
// However, we only want to use this function as the starting point if the
// `lockSsfi` flag isn't set.
//
// If the `lockSsfi` flag is set, then either this assertion has been
// overwritten by another assertion, or this assertion is being invoked from
// inside of another assertion. In the first case, the `ssfi` flag has
// already been set by the overwriting assertion. In the second case, the
// `ssfi` flag has already been set by the outer assertion.
if (!flag(this, 'lockSsfi')) {
flag(this, 'ssfi', methodWrapper);
}
var result = method.apply(this, arguments);
if (result !== undefined)
return result;
var newAssertion = new chai.Assertion();
transferFlags(this, newAssertion);
return newAssertion;
};
addLengthGuard(methodWrapper, name, false);
ctx[name] = proxify(methodWrapper, name);
};
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