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<?php
/**
 * This file is part of PHP Mess Detector.
 *
 * Copyright (c) Manuel Pichler <[email protected]>.
 * 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 <[email protected]>
 * @copyright Manuel Pichler. All rights reserved.
 * @license https://opensource.org/licenses/bsd-license.php BSD License
 * @link http://phpmd.org/
 */

namespace PHPMD\Rule\CleanCode;

use PHPMD\AbstractNode;
use PHPMD\AbstractRule;
use PHPMD\Node\ASTNode;
use PHPMD\Rule\FunctionAware;
use PHPMD\Rule\MethodAware;

/**
 * Checks that all classes are imported
 *
 * This rule can be used to prevent use of fully qualified class names.
 */
class MissingImport extends AbstractRule implements MethodAware, FunctionAware
{
    /**
     * @var array Self reference class names.
     */
    protected $selfReferences = array('self', 'static');

    /**
     * Checks for missing class imports and warns about it
     *
     * @param AbstractNode $node The node to check upon.
     * @return void
     */
    public function apply(AbstractNode $node)
    {
        $ignoreGlobal = $this->getBooleanProperty('ignore-global');

        foreach ($node->findChildrenOfType('AllocationExpression') as $allocationNode) {
            if (!$allocationNode) {
                continue;
            }

            $classNode = $allocationNode->getChild(0);

            if ($this->isSelfReference($classNode)) {
                continue;
            }

            if ($ignoreGlobal && $this->isGlobalNamespace($classNode)) {
                continue;
            }

            $classNameLength = $classNode->getEndColumn() - $classNode->getStartColumn() + 1;
            $className = $classNode->getImage();
            $fqcnLength = strlen($className);

            if ($classNameLength === $fqcnLength && substr($className, 0, 1) !== '$') {
                $this->addViolation($classNode, array($classNode->getBeginLine(), $classNode->getStartColumn()));
            }
        }
    }

    /**
     * Check whether a given class node is a self reference
     *
     * @param ASTNode $classNode A class node to check.
     * @return bool Whether the given class node is a self reference.
     */
    protected function isSelfReference(ASTNode $classNode)
    {
        return in_array($classNode->getImage(), $this->selfReferences, true);
    }

    /**
     * Check whether a given class node is in the global namespace
     *
     * @param ASTNode $classNode A class node to check.
     * @return bool Whether the given class node is in the global namespace.
     */
    protected function isGlobalNamespace(ASTNode $classNode)
    {
        return $classNode->getImage() !== '' && !strpos($classNode->getImage(), '\\', 1);
    }
}