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<?php |
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declare(strict_types = 1); |
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/* |
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* This file is part of Zenify |
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* Copyright (c) 2012 Tomas Votruba (http://tomasvotruba.cz) |
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*/ |
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namespace ZenifyCodingStandard\Sniffs\ControlStructures; |
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use PHP_CodeSniffer_File; |
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use PHP_CodeSniffer_Sniff; |
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/** |
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* Rules: |
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* - Yoda condition should not be used; switch expression order |
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*/ |
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final class YodaConditionSniff implements PHP_CodeSniffer_Sniff |
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{ |
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/** |
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* @var string |
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*/ |
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const NAME = 'ZenifyCodingStandard.ControlStructures.YodaCondition'; |
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/** |
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* @var int |
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*/ |
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private $position; |
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/** |
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* @var PHP_CodeSniffer_File |
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*/ |
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private $file; |
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/** |
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* @return int[] |
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*/ |
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public function register() : array |
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{ |
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return [ |
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T_IS_IDENTICAL, |
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T_IS_NOT_IDENTICAL, |
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T_IS_EQUAL, |
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T_IS_NOT_EQUAL, |
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T_GREATER_THAN, |
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T_LESS_THAN, |
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T_IS_GREATER_OR_EQUAL, |
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T_IS_SMALLER_OR_EQUAL |
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]; |
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} |
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/** |
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* @param PHP_CodeSniffer_File $file |
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* @param int $position |
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*/ |
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public function process(PHP_CodeSniffer_File $file, $position) |
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{ |
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$this->file = $file; |
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$this->position = $position; |
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$previousNonEmptyToken = $this->getPreviousNonEmptyToken(); |
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if ( ! $previousNonEmptyToken) { |
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return; |
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} |
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if ( ! $this->isExpressionToken($previousNonEmptyToken)) { |
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return; |
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} |
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$file->addError('Yoda condition should not be used; switch expression order', $position); |
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} |
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/** |
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* @return array|bool |
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*/ |
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private function getPreviousNonEmptyToken() |
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{ |
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$leftTokenPosition = $this->file->findPrevious(T_WHITESPACE, ($this->position - 1), NULL, TRUE); |
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$tokens = $this->file->getTokens(); |
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if ($leftTokenPosition) { |
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return $tokens[$leftTokenPosition]; |
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} |
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return FALSE; |
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} |
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private function isExpressionToken(array $token) : bool |
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{ |
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return in_array($token['code'], [T_MINUS, T_NULL, T_FALSE, T_TRUE, T_LNUMBER, T_CONSTANT_ENCAPSED_STRING]); |
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} |
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} |
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Zenify /
CodingStandard
If a method or function can return multiple different values and unless you are sure that you only can receive a single value in this context, we recommend to add an additional type check:
If this a common case that PHP Analyzer should handle natively, please let us know by opening an issue.