|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
declare(strict_types=1); |
|
4
|
|
|
|
|
5
|
|
|
/* |
|
6
|
|
|
* This file is part of the league/commonmark package. |
|
7
|
|
|
* |
|
8
|
|
|
* (c) Colin O'Dell <[email protected]> |
|
9
|
|
|
* |
|
10
|
|
|
* Original code based on the CommonMark JS reference parser (https://bitly.com/commonmark-js) |
|
11
|
|
|
* - (c) John MacFarlane |
|
12
|
|
|
* |
|
13
|
|
|
* For the full copyright and license information, please view the LICENSE |
|
14
|
|
|
* file that was distributed with this source code. |
|
15
|
|
|
*/ |
|
16
|
|
|
|
|
17
|
|
|
namespace League\CommonMark\Util; |
|
18
|
|
|
|
|
19
|
|
|
use League\CommonMark\Extension\CommonMark\Node\Block\HtmlBlock; |
|
20
|
|
|
|
|
21
|
|
|
/** |
|
22
|
|
|
* Provides regular expressions and utilities for parsing Markdown |
|
23
|
|
|
* |
|
24
|
|
|
* @phpcs:disable Generic.Strings.UnnecessaryStringConcat.Found |
|
25
|
|
|
* |
|
26
|
|
|
* @psalm-immutable |
|
27
|
|
|
*/ |
|
28
|
|
|
final class RegexHelper |
|
29
|
|
|
{ |
|
30
|
|
|
// Partial regular expressions (wrap with `/` on each side before use) |
|
31
|
|
|
public const PARTIAL_ENTITY = '&(?:#x[a-f0-9]{1,6}|#[0-9]{1,7}|[a-z][a-z0-9]{1,31});'; |
|
32
|
|
|
public const PARTIAL_ESCAPABLE = '[!"#$%&\'()*+,.\/:;<=>?@[\\\\\]^_`{|}~-]'; |
|
33
|
|
|
public const PARTIAL_ESCAPED_CHAR = '\\\\' . self::PARTIAL_ESCAPABLE; |
|
34
|
|
|
public const PARTIAL_IN_DOUBLE_QUOTES = '"(' . self::PARTIAL_ESCAPED_CHAR . '|[^"\x00])*"'; |
|
35
|
|
|
public const PARTIAL_IN_SINGLE_QUOTES = '\'(' . self::PARTIAL_ESCAPED_CHAR . '|[^\'\x00])*\''; |
|
36
|
|
|
public const PARTIAL_IN_PARENS = '\\((' . self::PARTIAL_ESCAPED_CHAR . '|[^)\x00])*\\)'; |
|
37
|
|
|
public const PARTIAL_REG_CHAR = '[^\\\\()\x00-\x20]'; |
|
38
|
|
|
public const PARTIAL_IN_PARENS_NOSP = '\((' . self::PARTIAL_REG_CHAR . '|' . self::PARTIAL_ESCAPED_CHAR . '|\\\\)*\)'; |
|
39
|
|
|
public const PARTIAL_TAGNAME = '[A-Za-z][A-Za-z0-9-]*'; |
|
40
|
|
|
public const PARTIAL_BLOCKTAGNAME = '(?:address|article|aside|base|basefont|blockquote|body|caption|center|col|colgroup|dd|details|dialog|dir|div|dl|dt|fieldset|figcaption|figure|footer|form|frame|frameset|h1|head|header|hr|html|iframe|legend|li|link|main|menu|menuitem|nav|noframes|ol|optgroup|option|p|param|section|source|summary|table|tbody|td|tfoot|th|thead|title|tr|track|ul)'; |
|
41
|
|
|
public const PARTIAL_ATTRIBUTENAME = '[a-zA-Z_:][a-zA-Z0-9:._-]*'; |
|
42
|
|
|
public const PARTIAL_UNQUOTEDVALUE = '[^"\'=<>`\x00-\x20]+'; |
|
43
|
|
|
public const PARTIAL_SINGLEQUOTEDVALUE = '\'[^\']*\''; |
|
44
|
|
|
public const PARTIAL_DOUBLEQUOTEDVALUE = '"[^"]*"'; |
|
45
|
|
|
public const PARTIAL_ATTRIBUTEVALUE = '(?:' . self::PARTIAL_UNQUOTEDVALUE . '|' . self::PARTIAL_SINGLEQUOTEDVALUE . '|' . self::PARTIAL_DOUBLEQUOTEDVALUE . ')'; |
|
46
|
|
|
public const PARTIAL_ATTRIBUTEVALUESPEC = '(?:' . '\s*=' . '\s*' . self::PARTIAL_ATTRIBUTEVALUE . ')'; |
|
47
|
|
|
public const PARTIAL_ATTRIBUTE = '(?:' . '\s+' . self::PARTIAL_ATTRIBUTENAME . self::PARTIAL_ATTRIBUTEVALUESPEC . '?)'; |
|
48
|
|
|
public const PARTIAL_OPENTAG = '<' . self::PARTIAL_TAGNAME . self::PARTIAL_ATTRIBUTE . '*' . '\s*\/?>'; |
|
49
|
|
|
public const PARTIAL_CLOSETAG = '<\/' . self::PARTIAL_TAGNAME . '\s*[>]'; |
|
50
|
|
|
public const PARTIAL_OPENBLOCKTAG = '<' . self::PARTIAL_BLOCKTAGNAME . self::PARTIAL_ATTRIBUTE . '*' . '\s*\/?>'; |
|
51
|
|
|
public const PARTIAL_CLOSEBLOCKTAG = '<\/' . self::PARTIAL_BLOCKTAGNAME . '\s*[>]'; |
|
52
|
|
|
public const PARTIAL_HTMLCOMMENT = '<!---->|<!--(?:-?[^>-])(?:-?[^-])*-->'; |
|
53
|
|
|
public const PARTIAL_PROCESSINGINSTRUCTION = '[<][?].*?[?][>]'; |
|
54
|
|
|
public const PARTIAL_DECLARATION = '<![A-Z]+' . '\s+[^>]*>'; |
|
55
|
|
|
public const PARTIAL_CDATA = '<!\[CDATA\[[\s\S]*?]\]>'; |
|
56
|
|
|
public const PARTIAL_HTMLTAG = '(?:' . self::PARTIAL_OPENTAG . '|' . self::PARTIAL_CLOSETAG . '|' . self::PARTIAL_HTMLCOMMENT . '|' . |
|
57
|
|
|
self::PARTIAL_PROCESSINGINSTRUCTION . '|' . self::PARTIAL_DECLARATION . '|' . self::PARTIAL_CDATA . ')'; |
|
58
|
|
|
public const PARTIAL_HTMLBLOCKOPEN = '<(?:' . self::PARTIAL_BLOCKTAGNAME . '(?:[\s\/>]|$)' . '|' . |
|
59
|
|
|
'\/' . self::PARTIAL_BLOCKTAGNAME . '(?:[\s>]|$)' . '|' . '[?!])'; |
|
60
|
|
|
public const PARTIAL_LINK_TITLE = '^(?:"(' . self::PARTIAL_ESCAPED_CHAR . '|[^"\x00])*"' . |
|
61
|
|
|
'|' . '\'(' . self::PARTIAL_ESCAPED_CHAR . '|[^\'\x00])*\'' . |
|
62
|
|
|
'|' . '\((' . self::PARTIAL_ESCAPED_CHAR . '|[^()\x00])*\))'; |
|
63
|
|
|
|
|
64
|
|
|
public const REGEX_PUNCTUATION = '/^[\x{2000}-\x{206F}\x{2E00}-\x{2E7F}\p{Pc}\p{Pd}\p{Pe}\p{Pf}\p{Pi}\p{Po}\p{Ps}\\\\\'!"#\$%&\(\)\*\+,\-\.\\/:;<=>\?@\[\]\^_`\{\|\}~]/u'; |
|
65
|
|
|
public const REGEX_UNSAFE_PROTOCOL = '/^javascript:|vbscript:|file:|data:/i'; |
|
66
|
|
|
public const REGEX_SAFE_DATA_PROTOCOL = '/^data:image\/(?:png|gif|jpeg|webp)/i'; |
|
67
|
|
|
public const REGEX_NON_SPACE = '/[^ \t\f\v\r\n]/'; |
|
68
|
|
|
|
|
69
|
|
|
public const REGEX_WHITESPACE_CHAR = '/^[ \t\n\x0b\x0c\x0d]/'; |
|
70
|
|
|
public const REGEX_UNICODE_WHITESPACE_CHAR = '/^\pZ|\s/u'; |
|
71
|
|
|
public const REGEX_THEMATIC_BREAK = '/^(?:(?:\*[ \t]*){3,}|(?:_[ \t]*){3,}|(?:-[ \t]*){3,})[ \t]*$/'; |
|
72
|
|
|
public const REGEX_LINK_DESTINATION_BRACES = '/^(?:<(?:[^<>\\n\\\\\\x00]|\\\\.)*>)/'; |
|
73
|
|
|
|
|
74
|
|
|
/** |
|
75
|
|
|
* @psalm-pure |
|
76
|
|
|
*/ |
|
77
|
123 |
|
public static function isEscapable(string $character): bool |
|
78
|
|
|
{ |
|
79
|
123 |
|
return \preg_match('/' . self::PARTIAL_ESCAPABLE . '/', $character) === 1; |
|
80
|
|
|
} |
|
81
|
|
|
|
|
82
|
|
|
/** |
|
83
|
|
|
* @psalm-pure |
|
84
|
|
|
*/ |
|
85
|
2817 |
|
public static function isLetter(?string $character): bool |
|
86
|
|
|
{ |
|
87
|
2817 |
|
if ($character === null) { |
|
88
|
|
|
return false; |
|
89
|
|
|
} |
|
90
|
|
|
|
|
91
|
2817 |
|
return \preg_match('/[\pL]/u', $character) === 1; |
|
92
|
|
|
} |
|
93
|
|
|
|
|
94
|
|
|
/** |
|
95
|
|
|
* Attempt to match a regex in string s at offset offset |
|
96
|
|
|
* |
|
97
|
|
|
* @return int|null Index of match, or null |
|
98
|
|
|
* |
|
99
|
|
|
* @psalm-pure |
|
100
|
|
|
*/ |
|
101
|
1779 |
|
public static function matchAt(string $regex, string $string, int $offset = 0): ?int |
|
102
|
|
|
{ |
|
103
|
1779 |
|
$matches = []; |
|
104
|
1779 |
|
$string = \mb_substr($string, $offset, null, 'utf-8'); |
|
105
|
1779 |
|
if (! \preg_match($regex, $string, $matches, \PREG_OFFSET_CAPTURE)) { |
|
106
|
1680 |
|
return null; |
|
107
|
|
|
} |
|
108
|
|
|
|
|
109
|
|
|
// PREG_OFFSET_CAPTURE always returns the byte offset, not the char offset, which is annoying |
|
110
|
321 |
|
$charPos = \mb_strlen(\mb_strcut($string, 0, $matches[0][1], 'utf-8'), 'utf-8'); |
|
111
|
|
|
|
|
112
|
321 |
|
return $offset + $charPos; |
|
113
|
|
|
} |
|
114
|
|
|
|
|
115
|
|
|
/** |
|
116
|
|
|
* Functional wrapper around preg_match_all which only returns the first set of matches |
|
117
|
|
|
* |
|
118
|
|
|
* @return string[]|null |
|
119
|
|
|
* |
|
120
|
|
|
* @psalm-pure |
|
121
|
|
|
*/ |
|
122
|
2100 |
|
public static function matchFirst(string $pattern, string $subject, int $offset = 0): ?array |
|
123
|
|
|
{ |
|
124
|
2100 |
|
if ($offset !== 0) { |
|
125
|
246 |
|
$subject = \substr($subject, $offset); |
|
126
|
|
|
} |
|
127
|
|
|
|
|
128
|
2100 |
|
\preg_match_all($pattern, $subject, $matches, \PREG_SET_ORDER); |
|
129
|
|
|
|
|
130
|
2100 |
|
if ($matches === []) { |
|
131
|
1962 |
|
return null; |
|
132
|
|
|
} |
|
133
|
|
|
|
|
134
|
534 |
|
return $matches[0] ?: null; |
|
135
|
|
|
} |
|
136
|
|
|
|
|
137
|
|
|
/** |
|
138
|
|
|
* Replace backslash escapes with literal characters |
|
139
|
|
|
* |
|
140
|
|
|
* @psalm-pure |
|
141
|
|
|
*/ |
|
142
|
588 |
|
public static function unescape(string $string): string |
|
143
|
|
|
{ |
|
144
|
588 |
|
$allEscapedChar = '/\\\\(' . self::PARTIAL_ESCAPABLE . ')/'; |
|
145
|
|
|
|
|
146
|
588 |
|
$escaped = \preg_replace($allEscapedChar, '$1', $string); |
|
147
|
|
|
\assert(\is_string($escaped)); |
|
148
|
|
|
|
|
149
|
392 |
|
return \preg_replace_callback('/' . self::PARTIAL_ENTITY . '/i', static function ($e) { |
|
150
|
24 |
|
return Html5EntityDecoder::decode($e[0]); |
|
151
|
588 |
|
}, $escaped); |
|
152
|
|
|
} |
|
153
|
|
|
|
|
154
|
|
|
/** |
|
155
|
|
|
* @internal |
|
156
|
|
|
* |
|
157
|
|
|
* @param int $type HTML block type |
|
158
|
|
|
* |
|
159
|
|
|
* @psalm-pure |
|
160
|
|
|
*/ |
|
161
|
342 |
|
public static function getHtmlBlockOpenRegex(int $type): string |
|
162
|
|
|
{ |
|
163
|
342 |
|
switch ($type) { |
|
164
|
|
|
case HtmlBlock::TYPE_1_CODE_CONTAINER: |
|
165
|
309 |
|
return '/^<(?:script|pre|textarea|style)(?:\s|>|$)/i'; |
|
166
|
|
|
case HtmlBlock::TYPE_2_COMMENT: |
|
167
|
288 |
|
return '/^<!--/'; |
|
168
|
|
|
case HtmlBlock::TYPE_3: |
|
169
|
273 |
|
return '/^<[?]/'; |
|
170
|
|
|
case HtmlBlock::TYPE_4: |
|
171
|
270 |
|
return '/^<![A-Z]/'; |
|
172
|
|
|
case HtmlBlock::TYPE_5_CDATA: |
|
173
|
267 |
|
return '/^<!\[CDATA\[/'; |
|
174
|
|
|
case HtmlBlock::TYPE_6_BLOCK_ELEMENT: |
|
175
|
261 |
|
return '%^<[/]?(?:address|article|aside|base|basefont|blockquote|body|caption|center|col|colgroup|dd|details|dialog|dir|div|dl|dt|fieldset|figcaption|figure|footer|form|frame|frameset|h[123456]|head|header|hr|html|iframe|legend|li|link|main|menu|menuitem|nav|noframes|ol|optgroup|option|p|param|section|source|summary|table|tbody|td|tfoot|th|thead|title|tr|track|ul)(?:\s|[/]?[>]|$)%i'; |
|
176
|
|
|
case HtmlBlock::TYPE_7_MISC_ELEMENT: |
|
177
|
177 |
|
return '/^(?:' . self::PARTIAL_OPENTAG . '|' . self::PARTIAL_CLOSETAG . ')\\s*$/i'; |
|
178
|
|
|
default: |
|
179
|
3 |
|
throw new \InvalidArgumentException('Invalid HTML block type'); |
|
180
|
|
|
} |
|
181
|
|
|
} |
|
182
|
|
|
|
|
183
|
|
|
/** |
|
184
|
|
|
* @internal |
|
185
|
|
|
* |
|
186
|
|
|
* @param int $type HTML block type |
|
187
|
|
|
* |
|
188
|
|
|
* @psalm-pure |
|
189
|
|
|
*/ |
|
190
|
69 |
|
public static function getHtmlBlockCloseRegex(int $type): string |
|
191
|
|
|
{ |
|
192
|
69 |
|
switch ($type) { |
|
193
|
|
|
case HtmlBlock::TYPE_1_CODE_CONTAINER: |
|
194
|
36 |
|
return '%<\/(?:script|pre|textarea|style)>%i'; |
|
195
|
|
|
case HtmlBlock::TYPE_2_COMMENT: |
|
196
|
15 |
|
return '/-->/'; |
|
197
|
|
|
case HtmlBlock::TYPE_3: |
|
198
|
3 |
|
return '/\?>/'; |
|
199
|
|
|
case HtmlBlock::TYPE_4: |
|
200
|
3 |
|
return '/>/'; |
|
201
|
|
|
case HtmlBlock::TYPE_5_CDATA: |
|
202
|
3 |
|
return '/\]\]>/'; |
|
203
|
|
|
default: |
|
204
|
9 |
|
throw new \InvalidArgumentException('Invalid HTML block type'); |
|
205
|
|
|
} |
|
206
|
|
|
} |
|
207
|
|
|
|
|
208
|
|
|
/** |
|
209
|
|
|
* @psalm-pure |
|
210
|
|
|
*/ |
|
211
|
36 |
|
public static function isLinkPotentiallyUnsafe(string $url): bool |
|
212
|
|
|
{ |
|
213
|
36 |
|
return \preg_match(self::REGEX_UNSAFE_PROTOCOL, $url) !== 0 && \preg_match(self::REGEX_SAFE_DATA_PROTOCOL, $url) === 0; |
|
214
|
|
|
} |
|
215
|
|
|
} |
|
216
|
|
|
|
thephpleague /
commonmark
