source: imaps-frontend/node_modules/es-abstract/5/AbstractEqualityComparison.js

'use strict';

var ToNumber = require('./ToNumber');
var ToPrimitive = require('./ToPrimitive');
var Type = require('./Type');

// https://262.ecma-international.org/5.1/#sec-11.9.3

module.exports = function AbstractEqualityComparison(x, y) {
        var xType = Type(x);
        var yType = Type(y);
        if (xType === yType) {
                return x === y; // ES6+ specified this shortcut anyways.
        }
        if (x == null && y == null) {
                return true;
        }
        if (xType === 'Number' && yType === 'String') {
                return AbstractEqualityComparison(x, ToNumber(y));
        }
        if (xType === 'String' && yType === 'Number') {
                return AbstractEqualityComparison(ToNumber(x), y);
        }
        if (xType === 'Boolean') {
                return AbstractEqualityComparison(ToNumber(x), y);
        }
        if (yType === 'Boolean') {
                return AbstractEqualityComparison(x, ToNumber(y));
        }
        if ((xType === 'String' || xType === 'Number') && yType === 'Object') {
                return AbstractEqualityComparison(x, ToPrimitive(y));
        }
        if (xType === 'Object' && (yType === 'String' || yType === 'Number')) {
                return AbstractEqualityComparison(ToPrimitive(x), y);
        }
        return false;
};