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Merge pull request #484 from eeree/feature/duplicated-array-keys
Feature/duplicated array keys
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src/main/php/PHPMD/Rule/CleanCode/DuplicatedArrayKey.php
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<?php | ||
/** | ||
* This file is part of PHP Mess Detector. | ||
* | ||
* Copyright (c) Manuel Pichler <mapi@phpmd.org>. | ||
* All rights reserved. | ||
* | ||
* Licensed under BSD License | ||
* For full copyright and license information, please see the LICENSE file. | ||
* Redistributions of files must retain the above copyright notice. | ||
* | ||
* @author Manuel Pichler <mapi@phpmd.org> | ||
* @copyright Manuel Pichler. All rights reserved. | ||
* @license https://opensource.org/licenses/bsd-license.php BSD License | ||
* @link http://phpmd.org/ | ||
*/ | ||
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namespace PHPMD\Rule\CleanCode; | ||
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use PDepend\Source\AST\AbstractASTNode; | ||
use PDepend\Source\AST\ASTArrayElement; | ||
use PDepend\Source\AST\ASTLiteral; | ||
use PDepend\Source\AST\ASTNode as PDependASTNode; | ||
use PHPMD\AbstractNode; | ||
use PHPMD\AbstractRule; | ||
use PHPMD\Node\ASTNode; | ||
use PHPMD\Rule\FunctionAware; | ||
use PHPMD\Rule\MethodAware; | ||
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/** | ||
* Duplicated Array Key Rule | ||
* | ||
* This rule detects duplicated array keys. | ||
* | ||
* @author Rafał Wrzeszcz <rafal.wrzeszcz@wrzasq.pl> | ||
* @author Kamil Szymanaski <kamil.szymanski@gmail.com> | ||
*/ | ||
class DuplicatedArrayKey extends AbstractRule implements MethodAware, FunctionAware | ||
{ | ||
/** | ||
* Retrieves all arrays from single node and performs comparison logic on it | ||
* | ||
* @param AbstractNode $node | ||
* @return void | ||
*/ | ||
public function apply(AbstractNode $node) | ||
{ | ||
foreach ($node->findChildrenOfType('Array') as $arrayNode) { | ||
/** @var ASTNode $arrayNode */ | ||
$this->checkForDuplicatedArrayKeys($arrayNode); | ||
} | ||
} | ||
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/** | ||
* This method checks if a given function or method contains an array literal | ||
* with duplicated entries for any key and emits a rule violation if so. | ||
* | ||
* @param ASTNode $node Array node. | ||
* @return void | ||
*/ | ||
private function checkForDuplicatedArrayKeys(ASTNode $node) | ||
{ | ||
$keys = array(); | ||
/** @var ASTArrayElement $arrayElement */ | ||
foreach ($node->getChildren() as $index => $arrayElement) { | ||
$arrayElement = $this->normalizeKey($arrayElement, $index); | ||
if (null === $arrayElement) { | ||
// skip everything that can't be resolved easily | ||
continue; | ||
} | ||
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$key = $arrayElement->getImage(); | ||
if (isset($keys[$key])) { | ||
$this->addViolation($node, array($key, $arrayElement->getStartLine())); | ||
continue; | ||
} | ||
$keys[$key] = $arrayElement; | ||
} | ||
} | ||
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/** | ||
* Changes key name to its string format. | ||
* | ||
* To compare keys, we have to cast them to string. | ||
* Non-associative keys have to use index as its key, | ||
* while boolean and nulls have to be casted respectively. | ||
* As current logic doesn't evaluate expressions nor constants, | ||
* statics, globals, etc. we simply skip them. | ||
* | ||
* @param AbstractASTNode $node Array key to evaluate. | ||
* @param int $index Fallback in case of non-associative arrays | ||
* @return AbstractASTNode Key name | ||
*/ | ||
private function normalizeKey(AbstractASTNode $node, $index) | ||
{ | ||
// non-associative - key name equals to its index | ||
if (count($node->getChildren()) === 0) { | ||
$node->setImage((string) $index); | ||
return $node; | ||
} | ||
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$node = $node->getChild(0); | ||
if (!($node instanceof ASTLiteral)) { | ||
// skip expressions, method calls, globals and constants | ||
return null; | ||
} | ||
$node->setImage($this->castStringFromLiteral($node)); | ||
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return $node; | ||
} | ||
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/** | ||
* Cleans string literals and casts boolean and null values as PHP engine does | ||
* | ||
* @param PDependASTNode $key | ||
* @return string | ||
*/ | ||
private function castStringFromLiteral(PDependASTNode $key) | ||
{ | ||
$value = $key->getImage(); | ||
switch ($value) { | ||
case 'false': | ||
return '0'; | ||
case 'true': | ||
return '1'; | ||
case 'null': | ||
return ''; | ||
default: | ||
return trim($value, '\'""'); | ||
} | ||
} | ||
} |
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