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// Test for equality any JavaScript type.
// Author: Philippe Rathé <prathe@gmail.com>
QUnit.equiv = (function() {
// Call the o related callback with the given arguments.
function bindCallbacks( o, callbacks, args ) {
var prop = QUnit.objectType( o );
if ( prop ) {
if ( QUnit.objectType( callbacks[ prop ] ) === "function" ) {
return callbacks[ prop ].apply( callbacks, args );
} else {
return callbacks[ prop ]; // or undefined
}
}
}
// the real equiv function
var innerEquiv,
// stack to decide between skip/abort functions
callers = [],
// stack to avoiding loops from circular referencing
parents = [],
parentsB = [],
getProto = Object.getPrototypeOf || function( obj ) {
/* jshint camelcase: false, proto: true */
return obj.__proto__;
},
callbacks = (function() {
// for string, boolean, number and null
function useStrictEquality( b, a ) {
/*jshint eqeqeq:false */
if ( b instanceof a.constructor || a instanceof b.constructor ) {
// to catch short annotation VS 'new' annotation of a
// declaration
// e.g. var i = 1;
// var j = new Number(1);
return a == b;
} else {
return a === b;
}
}
return {
"string": useStrictEquality,
"boolean": useStrictEquality,
"number": useStrictEquality,
"null": useStrictEquality,
"undefined": useStrictEquality,
"nan": function( b ) {
return isNaN( b );
},
"date": function( b, a ) {
return QUnit.objectType( b ) === "date" && a.valueOf() === b.valueOf();
},
"regexp": function( b, a ) {
return QUnit.objectType( b ) === "regexp" &&
// the regex itself
a.source === b.source &&
// and its modifiers
a.global === b.global &&
// (gmi) ...
a.ignoreCase === b.ignoreCase &&
a.multiline === b.multiline &&
a.sticky === b.sticky;
},
// - skip when the property is a method of an instance (OOP)
// - abort otherwise,
// initial === would have catch identical references anyway
"function": function() {
var caller = callers[ callers.length - 1 ];
return caller !== Object && typeof caller !== "undefined";
},
"array": function( b, a ) {
var i, j, len, loop, aCircular, bCircular;
// b could be an object literal here
if ( QUnit.objectType( b ) !== "array" ) {
return false;
}
len = a.length;
if ( len !== b.length ) {
// safe and faster
return false;
}
// track reference to avoid circular references
parents.push( a );
parentsB.push( b );
for ( i = 0; i < len; i++ ) {
loop = false;
for ( j = 0; j < parents.length; j++ ) {
aCircular = parents[ j ] === a[ i ];
bCircular = parentsB[ j ] === b[ i ];
if ( aCircular || bCircular ) {
if ( a[ i ] === b[ i ] || aCircular && bCircular ) {
loop = true;
} else {
parents.pop();
parentsB.pop();
return false;
}
}
}
if ( !loop && !innerEquiv( a[ i ], b[ i ] ) ) {
parents.pop();
parentsB.pop();
return false;
}
}
parents.pop();
parentsB.pop();
return true;
},
"object": function( b, a ) {
/*jshint forin:false */
var i, j, loop, aCircular, bCircular,
// Default to true
eq = true,
aProperties = [],
bProperties = [];
// comparing constructors is more strict than using
// instanceof
if ( a.constructor !== b.constructor ) {
// Allow objects with no prototype to be equivalent to
// objects with Object as their constructor.
if ( !( ( getProto( a ) === null && getProto( b ) === Object.prototype ) ||
( getProto( b ) === null && getProto( a ) === Object.prototype ) ) ) {
return false;
}
}
// stack constructor before traversing properties
callers.push( a.constructor );
// track reference to avoid circular references
parents.push( a );
parentsB.push( b );
// be strict: don't ensure hasOwnProperty and go deep
for ( i in a ) {
loop = false;
for ( j = 0; j < parents.length; j++ ) {
aCircular = parents[ j ] === a[ i ];
bCircular = parentsB[ j ] === b[ i ];
if ( aCircular || bCircular ) {
if ( a[ i ] === b[ i ] || aCircular && bCircular ) {
loop = true;
} else {
eq = false;
break;
}
}
}
aProperties.push( i );
if ( !loop && !innerEquiv( a[ i ], b[ i ] ) ) {
eq = false;
break;
}
}
parents.pop();
parentsB.pop();
callers.pop(); // unstack, we are done
for ( i in b ) {
bProperties.push( i ); // collect b's properties
}
// Ensures identical properties name
return eq && innerEquiv( aProperties.sort(), bProperties.sort() );
}
};
}());
innerEquiv = function() { // can take multiple arguments
var args = [].slice.apply( arguments );
if ( args.length < 2 ) {
return true; // end transition
}
return ( (function( a, b ) {
if ( a === b ) {
return true; // catch the most you can
} else if ( a === null || b === null || typeof a === "undefined" ||
typeof b === "undefined" ||
QUnit.objectType( a ) !== QUnit.objectType( b ) ) {
// don't lose time with error prone cases
return false;
} else {
return bindCallbacks( a, callbacks, [ b, a ] );
}
// apply transition with (1..n) arguments
}( args[ 0 ], args[ 1 ] ) ) && innerEquiv.apply( this, args.splice( 1, args.length - 1 ) ) );
};
return innerEquiv;
}());
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