47 lines
1.1 KiB
JavaScript
47 lines
1.1 KiB
JavaScript
// Equality function
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(function(baselib) {
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var exports = {};
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baselib.equality = exports;
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// equals: X Y -> boolean
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// Returns true if the objects are equivalent; otherwise, returns false.
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var equals = function(x, y, aUnionFind) {
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if (x === y) { return true; }
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if (plt.baselib.numbers.isNumber(x) && plt.baselib.numbers.isNumber(y)) {
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return plt.baselib.numbers.eqv(x, y);
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}
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if (baselib.strings.isString(x) && baselib.strings.isString(y)) {
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return x.toString() === y.toString();
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}
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if (x == undefined || x == null) {
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return (y == undefined || y == null);
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}
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if ( typeof(x) == 'object' &&
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typeof(y) == 'object' &&
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x.equals &&
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y.equals) {
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if (typeof (aUnionFind) === 'undefined') {
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aUnionFind = new plt.baselib.UnionFind();
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}
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if (aUnionFind.find(x) === aUnionFind.find(y)) {
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return true;
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}
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else {
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aUnionFind.merge(x, y);
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return x.equals(y, aUnionFind);
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}
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}
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return false;
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};
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exports.equals = equals;
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})(this['plt'].baselib); |