1<?php
2
3namespace dokuwiki\plugin\config\core;
4
5/**
6 * A naive PHP file parser
7 *
8 * This parses our very simple config file in PHP format. We use this instead of simply including
9 * the file, because we want to keep expressions such as 24*60*60 as is.
10 *
11 * @author  Chris Smith <chris@jalakai.co.uk>
12 */
13class ConfigParser
14{
15    /** @var string variable to parse from the file */
16    protected $varname = 'conf';
17    /** @var string the key to mark sub arrays */
18    protected $keymarker = Configuration::KEYMARKER;
19
20    /**
21     * Parse the given PHP file into an array
22     *
23     * When the given files does not exist, this returns an empty array
24     *
25     * @param string $file
26     * @return array
27     */
28    public function parse($file)
29    {
30        if (!file_exists($file)) return [];
31
32        $config = [];
33        $contents = @php_strip_whitespace($file);
34
35        // fallback to simply including the file #3271
36        if ($contents === null) {
37            $conf = [];
38            include $file;
39            return $conf;
40        }
41
42        $pattern = '/\$' . $this->varname . '\[[\'"]([^=]+)[\'"]\] ?= ?(.*?);(?=[^;]*(?:\$' . $this->varname . '|$))/s';
43        $matches = [];
44        preg_match_all($pattern, $contents, $matches, PREG_SET_ORDER);
45        $counter = count($matches);
46
47        for ($i = 0; $i < $counter; $i++) {
48            $value = $matches[$i][2];
49
50            // merge multi-dimensional array indices using the keymarker
51            $key = preg_replace('/.\]\[./', $this->keymarker, $matches[$i][1]);
52
53            // handle arrays
54            if (preg_match('/^array ?\((.*)\)/', $value, $match)) {
55                $arr = explode(',', $match[1]);
56
57                // remove quotes from quoted strings & unescape escaped data
58                $len = count($arr);
59                for ($j = 0; $j < $len; $j++) {
60                    $arr[$j] = trim($arr[$j]);
61                    $arr[$j] = $this->readValue($arr[$j]);
62                }
63
64                $value = $arr;
65            } else {
66                $value = $this->readValue($value);
67            }
68
69            $config[$key] = $value;
70        }
71
72        return $config;
73    }
74
75    /**
76     * Convert php string into value
77     *
78     * @param string $value
79     * @return bool|string
80     */
81    protected function readValue($value)
82    {
83        $removequotes_pattern = '/^(\'|")(.*)(?<!\\\\)\1$/s';
84        $unescape_pairs = [
85            '\\\\' => '\\',
86            '\\\'' => '\'',
87            '\\"' => '"'
88        ];
89
90        if ($value == 'true') {
91            $value = true;
92        } elseif ($value == 'false') {
93            $value = false;
94        } else {
95            // remove quotes from quoted strings & unescape escaped data
96            $value = preg_replace($removequotes_pattern, '$2', $value);
97            $value = strtr($value, $unescape_pairs);
98        }
99        return $value;
100    }
101}
102