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