92 lines
2.8 KiB
JavaScript
92 lines
2.8 KiB
JavaScript
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// Taken from node's assert module, because it sucks
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// and exposes next to nothing useful.
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module.exports = _deepEqual;
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function _deepEqual(actual, expected) {
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// 7.1. All identical values are equivalent, as determined by ===.
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if (actual === expected) {
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return true;
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} else if (Buffer.isBuffer(actual) && Buffer.isBuffer(expected)) {
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if (actual.length != expected.length) return false;
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for (var i = 0; i < actual.length; i++) {
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if (actual[i] !== expected[i]) return false;
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}
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return true;
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// 7.2. If the expected value is a Date object, the actual value is
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// equivalent if it is also a Date object that refers to the same time.
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} else if (actual instanceof Date && expected instanceof Date) {
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return actual.getTime() === expected.getTime();
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// 7.3. Other pairs that do not both pass typeof value == "object",
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// equivalence is determined by ==.
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} else if (typeof actual != 'object' && typeof expected != 'object') {
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return actual === expected;
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// 7.4. For all other Object pairs, including Array objects, equivalence is
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// determined by having the same number of owned properties (as verified
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// with Object.prototype.hasOwnProperty.call), the same set of keys
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// (although not necessarily the same order), equivalent values for every
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// corresponding key, and an identical "prototype" property. Note: this
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// accounts for both named and indexed properties on Arrays.
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} else {
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return objEquiv(actual, expected);
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}
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}
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function isUndefinedOrNull (value) {
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return value === null || value === undefined;
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}
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function isArguments (object) {
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return Object.prototype.toString.call(object) == '[object Arguments]';
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}
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function objEquiv (a, b) {
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if (isUndefinedOrNull(a) || isUndefinedOrNull(b))
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return false;
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// an identical "prototype" property.
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if (a.prototype !== b.prototype) return false;
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//~~~I've managed to break Object.keys through screwy arguments passing.
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// Converting to array solves the problem.
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if (isArguments(a)) {
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if (!isArguments(b)) {
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return false;
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}
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a = pSlice.call(a);
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b = pSlice.call(b);
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return _deepEqual(a, b);
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}
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try{
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var ka = Object.keys(a),
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kb = Object.keys(b),
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key, i;
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} catch (e) {//happens when one is a string literal and the other isn't
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return false;
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}
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// having the same number of owned properties (keys incorporates hasOwnProperty)
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if (ka.length != kb.length)
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return false;
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//the same set of keys (although not necessarily the same order),
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ka.sort();
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kb.sort();
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//~~~cheap key test
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for (i = ka.length - 1; i >= 0; i--) {
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if (ka[i] != kb[i])
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return false;
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}
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//equivalent values for every corresponding key, and
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//~~~possibly expensive deep test
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for (i = ka.length - 1; i >= 0; i--) {
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key = ka[i];
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if (!_deepEqual(a[key], b[key] ))
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return false;
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}
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return true;
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}
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