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/usr/share/php/ApiGen/Templating/Filters/NamespaceAndPackageUrlFilters.php is in php-apigen 4.1.2-1ubuntu2.

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<?php

/**
 * This file is part of the ApiGen (http://apigen.org)
 *
 * For the full copyright and license information, please view
 * the file license.md that was distributed with this source code.
 */

namespace ApiGen\Templating\Filters;

use ApiGen\Configuration\Configuration;
use ApiGen\Configuration\ConfigurationOptions as CO;
use ApiGen\Parser\Elements\ElementStorage;
use ApiGen\Templating\Filters\Helpers\LinkBuilder;


class NamespaceAndPackageUrlFilters extends Filters
{

	/**
	 * @var Configuration
	 */
	private $configuration;

	/**
	 * @var LinkBuilder
	 */
	private $linkBuilder;

	/**
	 * @var ElementStorage
	 */
	private $elementStorage;


	public function __construct(Configuration $configuration, LinkBuilder $linkBuilder, ElementStorage $elementStorage)
	{
		$this->configuration = $configuration;
		$this->linkBuilder = $linkBuilder;
		$this->elementStorage = $elementStorage;
	}


	/**
	 * @param string $groupName
	 * @return string
	 */
	public function subgroupName($groupName)
	{
		if ($pos = strrpos($groupName, '\\')) {
			return substr($groupName, $pos + 1);
		}
		return $groupName;
	}


	/**
	 * @param string $package
	 * @param bool $skipLast
	 * @return string
	 */
	public function packageLinks($package, $skipLast = TRUE)
	{
		if ( ! $this->elementStorage->getPackages()) {
			return $package;
		}

		$links = [];

		$parent = '';
		foreach (explode('\\', $package) as $part) {
			$parent = ltrim($parent . '\\' . $part, '\\');
			$links[] = ($skipLast || $parent !== $package)
				? $this->linkBuilder->build($this->packageUrl($parent), $part)
				: $part;
		}

		return implode('\\', $links);
	}


	/**
	 * @param string $namespace
	 * @param bool $skipLast
	 * @return string
	 */
	public function namespaceLinks($namespace, $skipLast = TRUE)
	{
		if ( ! $this->elementStorage->getNamespaces()) {
			return $namespace;
		}

		$links = [];

		$parent = '';
		foreach (explode('\\', $namespace) as $part) {
			$parent = ltrim($parent . '\\' . $part, '\\');
			$links[] = $skipLast || $parent !== $namespace
				? $this->linkBuilder->build($this->namespaceUrl($parent), $part)
				: $part;
		}

		return implode('\\', $links);
	}


	/**
	 * @param string $name
	 * @return string
	 */
	public function packageUrl($name)
	{
		return sprintf(
			$this->configuration->getOption(CO::TEMPLATE)['templates']['package']['filename'],
			$this->urlize($name)
		);
	}


	/**
	 * @param string $name
	 * @return string
	 */
	public function namespaceUrl($name)
	{
		return sprintf(
			$this->configuration->getOption(CO::TEMPLATE)['templates']['namespace']['filename'],
			$this->urlize($name)
		);
	}

}