166 lines
3.9 KiB
JavaScript
166 lines
3.9 KiB
JavaScript
import _arrayFromIterator from "./_arrayFromIterator.js";
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import _includesWith from "./_includesWith.js";
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import _functionName from "./_functionName.js";
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import _has from "./_has.js";
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import _objectIs from "./_objectIs.js";
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import keys from "../keys.js";
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import type from "../type.js";
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/**
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* private _uniqContentEquals function.
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* That function is checking equality of 2 iterator contents with 2 assumptions
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* - iterators lengths are the same
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* - iterators values are unique
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*
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* false-positive result will be returned for comparision of, e.g.
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* - [1,2,3] and [1,2,3,4]
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* - [1,1,1] and [1,2,3]
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* */
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function _uniqContentEquals(aIterator, bIterator, stackA, stackB) {
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var a = _arrayFromIterator(aIterator);
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var b = _arrayFromIterator(bIterator);
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function eq(_a, _b) {
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return _equals(_a, _b, stackA.slice(), stackB.slice());
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} // if *a* array contains any element that is not included in *b*
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return !_includesWith(function (b, aItem) {
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return !_includesWith(eq, aItem, b);
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}, b, a);
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}
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export default function _equals(a, b, stackA, stackB) {
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if (_objectIs(a, b)) {
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return true;
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}
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var typeA = type(a);
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if (typeA !== type(b)) {
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return false;
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}
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if (a == null || b == null) {
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return false;
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}
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if (typeof a['fantasy-land/equals'] === 'function' || typeof b['fantasy-land/equals'] === 'function') {
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return typeof a['fantasy-land/equals'] === 'function' && a['fantasy-land/equals'](b) && typeof b['fantasy-land/equals'] === 'function' && b['fantasy-land/equals'](a);
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}
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if (typeof a.equals === 'function' || typeof b.equals === 'function') {
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return typeof a.equals === 'function' && a.equals(b) && typeof b.equals === 'function' && b.equals(a);
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}
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switch (typeA) {
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case 'Arguments':
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case 'Array':
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case 'Object':
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if (typeof a.constructor === 'function' && _functionName(a.constructor) === 'Promise') {
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return a === b;
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}
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break;
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case 'Boolean':
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case 'Number':
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case 'String':
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if (!(typeof a === typeof b && _objectIs(a.valueOf(), b.valueOf()))) {
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return false;
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}
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break;
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case 'Date':
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if (!_objectIs(a.valueOf(), b.valueOf())) {
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return false;
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}
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break;
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case 'Error':
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return a.name === b.name && a.message === b.message;
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case 'RegExp':
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if (!(a.source === b.source && a.global === b.global && a.ignoreCase === b.ignoreCase && a.multiline === b.multiline && a.sticky === b.sticky && a.unicode === b.unicode)) {
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return false;
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}
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break;
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}
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var idx = stackA.length - 1;
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while (idx >= 0) {
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if (stackA[idx] === a) {
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return stackB[idx] === b;
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}
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idx -= 1;
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}
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switch (typeA) {
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case 'Map':
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if (a.size !== b.size) {
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return false;
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}
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return _uniqContentEquals(a.entries(), b.entries(), stackA.concat([a]), stackB.concat([b]));
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case 'Set':
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if (a.size !== b.size) {
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return false;
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}
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return _uniqContentEquals(a.values(), b.values(), stackA.concat([a]), stackB.concat([b]));
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case 'Arguments':
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case 'Array':
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case 'Object':
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case 'Boolean':
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case 'Number':
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case 'String':
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case 'Date':
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case 'Error':
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case 'RegExp':
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case 'Int8Array':
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case 'Uint8Array':
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case 'Uint8ClampedArray':
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case 'Int16Array':
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case 'Uint16Array':
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case 'Int32Array':
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case 'Uint32Array':
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case 'Float32Array':
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case 'Float64Array':
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case 'ArrayBuffer':
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break;
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default:
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// Values of other types are only equal if identical.
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return false;
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}
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var keysA = keys(a);
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if (keysA.length !== keys(b).length) {
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return false;
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}
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var extendedStackA = stackA.concat([a]);
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var extendedStackB = stackB.concat([b]);
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idx = keysA.length - 1;
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while (idx >= 0) {
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var key = keysA[idx];
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if (!(_has(key, b) && _equals(b[key], a[key], extendedStackA, extendedStackB))) {
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return false;
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}
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idx -= 1;
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}
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return true;
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} |