|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
namespace SCI\Bibtex; |
|
4
|
|
|
|
|
5
|
|
|
/** |
|
6
|
|
|
* @note most of the parsing code has been copied from PARSEENTRIES therefore |
|
7
|
|
|
* thanks goes to the authors of http://bibliophile.sourceforge.net |
|
8
|
|
|
* |
|
9
|
|
|
* Comments to the source code can be found at |
|
10
|
|
|
* http://sourceforge.net/projects/bibliophile/files/bibtexParse/ and is |
|
11
|
|
|
* released under the GPL license. |
|
12
|
|
|
* |
|
13
|
|
|
* @note There might be a better parser out there but I didn't want to spend to |
|
14
|
|
|
* much time reviewing code therefore PARSEENTRIES does the job well. |
|
15
|
|
|
* |
|
16
|
|
|
* Any fancy macro stuff or other complicated string parsing isn't supported |
|
17
|
|
|
* given that the bibtex format misses a proper specification. PARSEENTRIES |
|
18
|
|
|
* surely allows to cover more edge cases but for what we want to achieve (to ease |
|
19
|
|
|
* copy and paste of existing bibtex records) the current implementation is |
|
20
|
|
|
* sufficient. |
|
21
|
|
|
* |
|
22
|
|
|
* BibtexParserTest provides the test interface to verify edge cases. |
|
23
|
|
|
* |
|
24
|
|
|
* @license GNU GPL v2+ |
|
25
|
|
|
* @since 1.0 |
|
26
|
|
|
*/ |
|
27
|
|
|
class BibtexParser { |
|
28
|
|
|
|
|
29
|
|
|
/** |
|
30
|
|
|
* @var array |
|
31
|
|
|
*/ |
|
32
|
|
|
private $undefinedStrings = []; |
|
|
|
|
|
|
33
|
|
|
|
|
34
|
|
|
/** |
|
35
|
|
|
* @var array |
|
36
|
|
|
*/ |
|
37
|
|
|
private $strings = []; |
|
|
|
|
|
|
38
|
|
|
|
|
39
|
|
|
/** |
|
40
|
|
|
* @since 1.0 |
|
41
|
|
|
* |
|
42
|
|
|
* @return array |
|
43
|
|
|
*/ |
|
44
|
7 |
|
public function parse( $bibtex ) { |
|
45
|
|
|
|
|
46
|
7 |
|
if ( ( $matches = $this->findBibtexFormatMatches( $bibtex ) ) === [] ) { |
|
47
|
2 |
|
return []; |
|
48
|
|
|
} |
|
49
|
|
|
|
|
50
|
|
|
$head = [ |
|
51
|
5 |
|
'type' => strtolower( trim( $matches[1] ) ), |
|
52
|
5 |
|
'reference' => $matches[2] |
|
53
|
|
|
]; |
|
54
|
|
|
|
|
55
|
5 |
|
return $head + $this->parseFields( $matches[3] ); |
|
56
|
|
|
} |
|
57
|
|
|
|
|
58
|
7 |
|
private function findBibtexFormatMatches( $bibtex ) { |
|
59
|
|
|
|
|
60
|
7 |
|
$matches = preg_split("/@(.*)[{(](.*),/U", $bibtex, 2, PREG_SPLIT_DELIM_CAPTURE ); |
|
61
|
|
|
|
|
62
|
|
|
// Silently retreat from processing |
|
63
|
7 |
|
if ( !isset( $matches[2] ) ) { |
|
64
|
2 |
|
return []; |
|
65
|
|
|
} |
|
66
|
|
|
|
|
67
|
5 |
|
if( preg_match("/=/", $matches[2] ) ) { |
|
68
|
|
|
$matches = preg_split("/@(.*)\s*[{(](.*)/U", $bibtex, 2, PREG_SPLIT_DELIM_CAPTURE ); |
|
69
|
|
|
} |
|
70
|
|
|
|
|
71
|
5 |
|
return $matches; |
|
72
|
|
|
} |
|
73
|
|
|
|
|
74
|
5 |
|
private function parseFields( $content ) { |
|
75
|
5 |
|
$elements = []; |
|
76
|
5 |
|
$values = []; |
|
77
|
|
|
|
|
78
|
5 |
|
$length = strlen( $content ); |
|
79
|
|
|
|
|
80
|
5 |
|
if( $content[$length - 1] == "}" || $content[$length - 1] == ")" || $content[$length - 1] == ",") { |
|
81
|
5 |
|
$content = substr( $content, 0, $length - 1 ); |
|
82
|
|
|
} |
|
83
|
|
|
|
|
84
|
5 |
|
$split = preg_split("/=/", $content, 2 ); |
|
85
|
5 |
|
$string = $split[1]; |
|
86
|
|
|
|
|
87
|
5 |
|
while( $string ) { |
|
88
|
5 |
|
list( $entry, $string ) = $this->splitField( $string ); |
|
89
|
5 |
|
$values[] = $entry; |
|
90
|
|
|
} |
|
91
|
|
|
|
|
92
|
5 |
|
foreach( $values as $value ) { |
|
93
|
5 |
|
$pos = strpos( $content, $value); |
|
94
|
5 |
|
$content = substr_replace( $content, '', $pos, strlen( $value ) ); |
|
95
|
|
|
} |
|
96
|
|
|
|
|
97
|
5 |
|
$rev = strrev( trim( $content ) ); |
|
98
|
|
|
|
|
99
|
5 |
|
if( $rev[0] != ',') { |
|
100
|
5 |
|
$content .= ','; |
|
101
|
|
|
} |
|
102
|
|
|
|
|
103
|
5 |
|
$keys = preg_split("/=,/", $content ); |
|
104
|
5 |
|
array_pop($keys); |
|
105
|
|
|
|
|
106
|
5 |
|
foreach( $keys as $key ) { |
|
107
|
5 |
|
$value = trim( array_shift( $values ) ); |
|
108
|
5 |
|
$rev = strrev( $value ); |
|
109
|
|
|
|
|
110
|
|
|
// remove any dangling ',' left on final field of entry |
|
111
|
5 |
|
if( $rev[0] == ',') { |
|
112
|
1 |
|
$value = rtrim($value, ","); |
|
113
|
|
|
} |
|
114
|
|
|
|
|
115
|
5 |
|
if(!$value) { |
|
116
|
|
|
continue; |
|
117
|
|
|
} |
|
118
|
|
|
|
|
119
|
5 |
|
$key = strtolower(trim($key)); |
|
120
|
5 |
|
$value = trim($value); |
|
121
|
5 |
|
$elements[$key] = $this->removeDelimiters( $value ); |
|
122
|
|
|
} |
|
123
|
|
|
|
|
124
|
5 |
|
return $elements; |
|
125
|
|
|
} |
|
126
|
|
|
|
|
127
|
5 |
|
private function splitField( $seg ) { |
|
128
|
|
|
|
|
129
|
5 |
|
$array = preg_split("/,\s*([-_.:,a-zA-Z0-9]+)\s*={1}\s*/U", $seg, PREG_SPLIT_DELIM_CAPTURE ); |
|
130
|
|
|
|
|
131
|
|
|
// if(!array_key_exists( 1, $array ) ) { |
|
132
|
|
|
// return array( $array[0], FALSE); |
|
133
|
|
|
// } |
|
134
|
|
|
|
|
135
|
5 |
|
return isset( $array[1] ) ? [ $array[0], $array[1] ] : [ $array[0], false ]; |
|
136
|
|
|
} |
|
137
|
|
|
|
|
138
|
5 |
|
private function removeDelimiters( $string ) { |
|
139
|
|
|
|
|
140
|
5 |
|
if( $string && ( $string[0] == "\"") ) { |
|
141
|
1 |
|
$string = substr($string, 1); |
|
142
|
1 |
|
$string = substr($string, 0, -1); |
|
143
|
5 |
|
} else if ( $string && ( $string[0] == "{") ) { |
|
144
|
5 |
|
if( strlen( $string ) > 0 && $string[strlen($string)-1] == "}" ) { |
|
145
|
5 |
|
$string = substr($string, 1); |
|
146
|
5 |
|
$string = substr($string, 0, -1); |
|
147
|
|
|
} |
|
148
|
|
|
|
|
149
|
|
|
// } else if(!is_numeric($string) && !array_key_exists($string, $this->strings) |
|
150
|
|
|
// && (array_search($string, $this->undefinedStrings) === FALSE ) ) { |
|
151
|
|
|
// $this->undefinedStrings[] = $string; // Undefined string that is not a year etc. |
|
152
|
|
|
// return ''; |
|
153
|
|
|
} |
|
154
|
|
|
|
|
155
|
5 |
|
return $string; |
|
156
|
|
|
} |
|
157
|
|
|
} |
|
158
|
|
|
|
SemanticMediaWiki /
SemanticCite
Loading history...