1<?php
2/*
3 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
4 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
5 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
6 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
7 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
8 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
9 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
10 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
11 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
12 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
13 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
14 *
15 * This software consists of voluntary contributions made by many individuals
16 * and is licensed under the MIT license. For more information, see
17 * <http://www.doctrine-project.org>.
18 */
19
20namespace Doctrine\Common\Annotations;
21
22use SplFileObject;
23
24/**
25 * Parses a file for namespaces/use/class declarations.
26 *
27 * @author Fabien Potencier <fabien@symfony.com>
28 * @author Christian Kaps <christian.kaps@mohiva.com>
29 */
30final class PhpParser
31{
32    /**
33     * Parses a class.
34     *
35     * @param \ReflectionClass $class A <code>ReflectionClass</code> object.
36     *
37     * @return array A list with use statements in the form (Alias => FQN).
38     */
39    public function parseClass(\ReflectionClass $class)
40    {
41        if (method_exists($class, 'getUseStatements')) {
42            return $class->getUseStatements();
43        }
44
45        if (false === $filename = $class->getFileName()) {
46            return array();
47        }
48
49        $content = $this->getFileContent($filename, $class->getStartLine());
50
51        if (null === $content) {
52            return array();
53        }
54
55        $namespace = preg_quote($class->getNamespaceName());
56        $content = preg_replace('/^.*?(\bnamespace\s+' . $namespace . '\s*[;{].*)$/s', '\\1', $content);
57        $tokenizer = new TokenParser('<?php ' . $content);
58
59        $statements = $tokenizer->parseUseStatements($class->getNamespaceName());
60
61        return $statements;
62    }
63
64    /**
65     * Gets the content of the file right up to the given line number.
66     *
67     * @param string  $filename   The name of the file to load.
68     * @param integer $lineNumber The number of lines to read from file.
69     *
70     * @return string|null The content of the file or null if the file does not exist.
71     */
72    private function getFileContent($filename, $lineNumber)
73    {
74        if ( ! is_file($filename)) {
75            return null;
76        }
77
78        $content = '';
79        $lineCnt = 0;
80        $file = new SplFileObject($filename);
81        while (!$file->eof()) {
82            if ($lineCnt++ == $lineNumber) {
83                break;
84            }
85
86            $content .= $file->fgets();
87        }
88
89        return $content;
90    }
91}
92