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							82 lines
						
					
					
						
							2.1 KiB
						
					
					
				
			
		
		
	
	
							82 lines
						
					
					
						
							2.1 KiB
						
					
					
				'use strict'; | 
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var GetIntrinsic = require('get-intrinsic'); | 
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var $Number = GetIntrinsic('%Number%'); | 
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var $TypeError = GetIntrinsic('%TypeError%'); | 
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var $isNaN = require('../helpers/isNaN'); | 
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var IsStringPrefix = require('./IsStringPrefix'); | 
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var StringToBigInt = require('./StringToBigInt'); | 
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var ToNumeric = require('./ToNumeric'); | 
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var ToPrimitive = require('./ToPrimitive'); | 
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var Type = require('./Type'); | 
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var BigIntLessThan = require('./BigInt/lessThan'); | 
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var NumberLessThan = require('./Number/lessThan'); | 
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// https://262.ecma-international.org/9.0/#sec-abstract-relational-comparison | 
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// eslint-disable-next-line max-statements, max-lines-per-function | 
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module.exports = function AbstractRelationalComparison(x, y, LeftFirst) { | 
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	if (Type(LeftFirst) !== 'Boolean') { | 
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		throw new $TypeError('Assertion failed: LeftFirst argument must be a Boolean'); | 
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	} | 
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	var px; | 
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	var py; | 
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	if (LeftFirst) { | 
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		px = ToPrimitive(x, $Number); | 
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		py = ToPrimitive(y, $Number); | 
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	} else { | 
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		py = ToPrimitive(y, $Number); | 
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		px = ToPrimitive(x, $Number); | 
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	} | 
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	if (Type(px) === 'String' && Type(py) === 'String') { | 
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		if (IsStringPrefix(py, px)) { | 
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			return false; | 
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		} | 
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		if (IsStringPrefix(px, py)) { | 
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			return true; | 
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		} | 
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		return px < py; // both strings, neither a prefix of the other. shortcut for steps 3 c-f | 
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	} | 
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	var pxType = Type(px); | 
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	var pyType = Type(py); | 
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	var nx; | 
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	var ny; | 
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	if (pxType === 'BigInt' && pyType === 'String') { | 
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		ny = StringToBigInt(py); | 
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		if ($isNaN(ny)) { | 
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			return void undefined; | 
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		} | 
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		return BigIntLessThan(px, ny); | 
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	} | 
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	if (pxType === 'String' && pyType === 'BigInt') { | 
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		nx = StringToBigInt(px); | 
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		if ($isNaN(nx)) { | 
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			return void undefined; | 
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		} | 
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		return BigIntLessThan(px, ny); | 
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	} | 
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	nx = ToNumeric(px); | 
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	ny = ToNumeric(py); | 
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	var nxType = Type(nx); | 
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	if (nxType === Type(ny)) { | 
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		return nxType === 'Number' ? NumberLessThan(nx, ny) : BigIntLessThan(nx, ny); | 
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	} | 
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	if ($isNaN(nx) || $isNaN(ny)) { | 
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		return void undefined; | 
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	} | 
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	if (nx === -Infinity || ny === Infinity) { | 
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		return true; | 
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	} | 
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	if (nx === Infinity || ny === -Infinity) { | 
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		return false; | 
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	} | 
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	return nx < ny; // by now, these are both nonzero, finite, and not equal | 
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};
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