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+<?php
+
+declare(strict_types=1);
+
+/**
+ * This file is part of phpDocumentor.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @link http://phpdoc.org
+ */
+
+namespace phpDocumentor\Reflection\DocBlock;
+
+use phpDocumentor\Reflection\DocBlock\Tags\Example;
+
+use function array_slice;
+use function file;
+use function getcwd;
+use function implode;
+use function is_readable;
+use function rtrim;
+use function sprintf;
+use function trim;
+
+use const DIRECTORY_SEPARATOR;
+
+/**
+ * Class used to find an example file's location based on a given ExampleDescriptor.
+ */
+class ExampleFinder
+{
+ /** @var string */
+ private $sourceDirectory = '';
+
+ /** @var string[] */
+ private $exampleDirectories = [];
+
+ /**
+ * Attempts to find the example contents for the given descriptor.
+ */
+ public function find(Example $example): string
+ {
+ $filename = $example->getFilePath();
+
+ $file = $this->getExampleFileContents($filename);
+ if (!$file) {
+ return sprintf('** File not found : %s **', $filename);
+ }
+
+ return implode('', array_slice($file, $example->getStartingLine() - 1, $example->getLineCount()));
+ }
+
+ /**
+ * Registers the project's root directory where an 'examples' folder can be expected.
+ */
+ public function setSourceDirectory(string $directory = ''): void
+ {
+ $this->sourceDirectory = $directory;
+ }
+
+ /**
+ * Returns the project's root directory where an 'examples' folder can be expected.
+ */
+ public function getSourceDirectory(): string
+ {
+ return $this->sourceDirectory;
+ }
+
+ /**
+ * Registers a series of directories that may contain examples.
+ *
+ * @param string[] $directories
+ */
+ public function setExampleDirectories(array $directories): void
+ {
+ $this->exampleDirectories = $directories;
+ }
+
+ /**
+ * Returns a series of directories that may contain examples.
+ *
+ * @return string[]
+ */
+ public function getExampleDirectories(): array
+ {
+ return $this->exampleDirectories;
+ }
+
+ /**
+ * Attempts to find the requested example file and returns its contents or null if no file was found.
+ *
+ * This method will try several methods in search of the given example file, the first one it encounters is
+ * returned:
+ *
+ * 1. Iterates through all examples folders for the given filename
+ * 2. Checks the source folder for the given filename
+ * 3. Checks the 'examples' folder in the current working directory for examples
+ * 4. Checks the path relative to the current working directory for the given filename
+ *
+ * @return string[] all lines of the example file
+ */
+ private function getExampleFileContents(string $filename): ?array
+ {
+ $normalizedPath = null;
+
+ foreach ($this->exampleDirectories as $directory) {
+ $exampleFileFromConfig = $this->constructExamplePath($directory, $filename);
+ if (is_readable($exampleFileFromConfig)) {
+ $normalizedPath = $exampleFileFromConfig;
+ break;
+ }
+ }
+
+ if (!$normalizedPath) {
+ if (is_readable($this->getExamplePathFromSource($filename))) {
+ $normalizedPath = $this->getExamplePathFromSource($filename);
+ } elseif (is_readable($this->getExamplePathFromExampleDirectory($filename))) {
+ $normalizedPath = $this->getExamplePathFromExampleDirectory($filename);
+ } elseif (is_readable($filename)) {
+ $normalizedPath = $filename;
+ }
+ }
+
+ $lines = $normalizedPath && is_readable($normalizedPath) ? file($normalizedPath) : false;
+
+ return $lines !== false ? $lines : null;
+ }
+
+ /**
+ * Get example filepath based on the example directory inside your project.
+ */
+ private function getExamplePathFromExampleDirectory(string $file): string
+ {
+ return getcwd() . DIRECTORY_SEPARATOR . 'examples' . DIRECTORY_SEPARATOR . $file;
+ }
+
+ /**
+ * Returns a path to the example file in the given directory..
+ */
+ private function constructExamplePath(string $directory, string $file): string
+ {
+ return rtrim($directory, '\\/') . DIRECTORY_SEPARATOR . $file;
+ }
+
+ /**
+ * Get example filepath based on sourcecode.
+ */
+ private function getExamplePathFromSource(string $file): string
+ {
+ return sprintf(
+ '%s%s%s',
+ trim($this->getSourceDirectory(), '\\/'),
+ DIRECTORY_SEPARATOR,
+ trim($file, '"')
+ );
+ }
+}