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148 lars 1 
<?php declare(strict_types=1);
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/*
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 * This file is part of PHPUnit.
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 *
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 * (c) Sebastian Bergmann <sebastian@phpunit.de>
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 *
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 * For the full copyright and license information, please view the LICENSE
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 * file that was distributed with this source code.
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 */
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namespace PHPUnit\Util;
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use function in_array;
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use function sprintf;
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/**
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 * @internal This class is not covered by the backward compatibility promise for PHPUnit
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 *
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 * @psalm-immutable
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 */
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final class VersionComparisonOperator
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{
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    /**
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     * @psalm-var '<'|'lt'|'<='|'le'|'>'|'gt'|'>='|'ge'|'=='|'='|'eq'|'!='|'<>'|'ne'
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     */
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    private $operator;
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    public function __construct(string $operator)
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    {
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        $this->ensureOperatorIsValid($operator);
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        $this->operator = $operator;
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    }
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    /**
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     * @return '!='|'<'|'<='|'<>'|'='|'=='|'>'|'>='|'eq'|'ge'|'gt'|'le'|'lt'|'ne'
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     */
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    public function asString(): string
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    {
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        return $this->operator;
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    }
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    /**
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     * @throws Exception
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     *
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     * @psalm-assert '<'|'lt'|'<='|'le'|'>'|'gt'|'>='|'ge'|'=='|'='|'eq'|'!='|'<>'|'ne' $operator
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     */
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    private function ensureOperatorIsValid(string $operator): void
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    {
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        if (!in_array($operator, ['<', 'lt', '<=', 'le', '>', 'gt', '>=', 'ge', '==', '=', 'eq', '!=', '<>', 'ne'], true)) {
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            throw new Exception(
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                sprintf(
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                    '"%s" is not a valid version_compare() operator',
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                    $operator
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                )
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            );
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        }
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    }
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}