|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
namespace PHPFunctional\PatternMatching; |
|
4
|
|
|
|
|
5
|
|
|
class Parser |
|
6
|
|
|
{ |
|
7
|
|
|
protected $reserved = ['true', 'false']; |
|
8
|
|
|
|
|
9
|
|
|
protected $rules = [ |
|
10
|
|
|
'/^(true|false)$/i' => '_parseBooleanConstant', |
|
11
|
|
|
'/^([\'"])(?:(?!\\1).)*\\1$/' => '_parseStringConstant', |
|
12
|
|
|
'/^[a-zA-Z]+$/' => '_parseIdentifier', |
|
13
|
|
|
'/^_$/' => '_parseWildcard', |
|
14
|
|
|
'/^\\[.*\\]$/' => '_parseArray', |
|
15
|
|
|
'/^\\([^:]+:.+\\)$/' => '_parseCons', |
|
16
|
|
|
'/^[a-zA-Z]+@.+$/' => '_parseAs', |
|
17
|
|
|
]; |
|
18
|
|
|
|
|
19
|
|
|
protected function _parseBooleanConstant($value, $pattern) |
|
20
|
|
|
{ |
|
21
|
|
|
$pattern_value = strtoupper($pattern) === 'TRUE' ? true : false; |
|
22
|
|
|
return is_bool($value) && $value === $pattern_value ? [] : false; |
|
23
|
|
|
} |
|
24
|
|
|
|
|
25
|
|
|
protected function _parseStringConstant($value, $pattern) |
|
26
|
|
|
{ |
|
27
|
|
|
$string_pattern = substr($pattern, 1, -1); |
|
28
|
|
|
return is_string($value) && $string_pattern == $value ? [] : false; |
|
29
|
|
|
} |
|
30
|
|
|
|
|
31
|
|
|
protected function _parseIdentifier($value, $pattern) |
|
32
|
|
|
{ |
|
33
|
|
|
return in_array(strtolower($pattern), $this->reserved) ? false : [$value]; |
|
34
|
|
|
} |
|
35
|
|
|
|
|
36
|
|
|
protected function _parseWildcard() |
|
37
|
|
|
{ |
|
38
|
|
|
return []; |
|
39
|
|
|
} |
|
40
|
|
|
|
|
41
|
|
|
protected function _parseArray($value, $pattern) |
|
42
|
|
|
{ |
|
43
|
|
|
if(! is_array($value)) { |
|
44
|
|
|
return false; |
|
45
|
|
|
} |
|
46
|
|
|
|
|
47
|
|
|
$patterns = array_filter(array_map('trim', split_enclosed(',', '[', ']', substr($pattern, 1, -1)))); |
|
48
|
|
|
|
|
49
|
|
|
if(count($patterns) === 0) { |
|
50
|
|
|
return count($value) === 0 ? [] : false; |
|
51
|
|
|
} |
|
52
|
|
|
|
|
53
|
|
|
if(count($patterns) > count($value)) { |
|
54
|
|
|
return false; |
|
55
|
|
|
} |
|
56
|
|
|
|
|
57
|
|
|
$index = 0; |
|
58
|
|
|
$results = []; |
|
59
|
|
|
foreach($value as $v) { |
|
60
|
|
|
$new = $this->parse($v, $patterns[$index]); |
|
61
|
|
|
|
|
62
|
|
|
if($new === false) { |
|
63
|
|
|
return false; |
|
64
|
|
|
} |
|
65
|
|
|
|
|
66
|
|
|
$results = array_merge($results, $new); |
|
67
|
|
|
++$index; |
|
68
|
|
|
} |
|
69
|
|
|
|
|
70
|
|
|
return $results; |
|
71
|
|
|
} |
|
72
|
|
|
|
|
73
|
|
|
protected function _parseCons($value, $pattern) |
|
74
|
|
|
{ |
|
75
|
|
|
if(! is_array($value)) { |
|
76
|
|
|
return false; |
|
77
|
|
|
} |
|
78
|
|
|
|
|
79
|
|
|
$patterns = array_filter(array_map('trim', split_enclosed(':', '(', ')', substr($pattern, 1, -1)))); |
|
80
|
|
|
$last = array_pop($patterns); |
|
81
|
|
|
|
|
82
|
|
|
$results = []; |
|
83
|
|
|
foreach($patterns as $p) { |
|
84
|
|
|
if(count($value) == 0) { |
|
85
|
|
|
return false; |
|
86
|
|
|
} |
|
87
|
|
|
|
|
88
|
|
|
$new = $this->parse(array_shift($value), $p); |
|
89
|
|
|
|
|
90
|
|
|
if($new === false) { |
|
91
|
|
|
return false; |
|
92
|
|
|
} |
|
93
|
|
|
|
|
94
|
|
|
$results = array_merge($results, $new); |
|
95
|
|
|
} |
|
96
|
|
|
|
|
97
|
|
|
$new = $this->parse($value, $last); |
|
98
|
|
|
|
|
99
|
|
|
return $new === false ? false : array_merge($results, $new); |
|
100
|
|
|
} |
|
101
|
|
|
|
|
102
|
|
|
protected function _parseAs($value, $pattern) |
|
103
|
|
|
{ |
|
104
|
|
|
$patterns = explode('@', $pattern, 2); |
|
105
|
|
|
|
|
106
|
|
|
$rest = $this->parse($value, $patterns[1]); |
|
107
|
|
|
return $rest === false ? false : array_merge([$value], $rest); |
|
108
|
|
|
} |
|
109
|
|
|
|
|
110
|
|
|
/** |
|
111
|
|
|
* @param mixed $value |
|
112
|
|
|
* @param string $pattern |
|
113
|
|
|
* @return bool|array |
|
114
|
|
|
*/ |
|
115
|
|
|
public function parse($value, $pattern) |
|
116
|
|
|
{ |
|
117
|
|
|
$pattern = trim($pattern); |
|
|
|
|
|
|
118
|
|
|
|
|
119
|
|
|
if(is_numeric($pattern) && is_numeric($value)) { |
|
120
|
|
|
return $pattern == $value ? [] : false; |
|
121
|
|
|
} |
|
122
|
|
|
|
|
123
|
|
|
foreach($this->rules as $regex => $method) { |
|
124
|
|
|
if(preg_match($regex, $pattern)) { |
|
125
|
|
|
$arguments = call_user_func_array([$this, $method], [$value, $pattern]); |
|
126
|
|
|
|
|
127
|
|
|
if($arguments !== false) { |
|
128
|
|
|
return $arguments; |
|
129
|
|
|
} |
|
130
|
|
|
} |
|
131
|
|
|
} |
|
132
|
|
|
|
|
133
|
|
|
return false; |
|
134
|
|
|
} |
|
135
|
|
|
} |
functional-php /
pattern-matching
Loading history...