RegexHelper::getThematicBreakRegex() - Code Metrics - Inspection of "Merge pull request #212 from thephpleague/spec-0.2..." - thephpleague/commonmark - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 6c85d2...15e8d5 )

by Colin

created 2016-01-13 01:25 UTC

RegexHelper::getThematicBreakRegex() A

↳ Parent: RegexHelper

Complexity

Conditions	1
Paths	1

Size

Total Lines	4
Code Lines	2

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	2
CRAP Score	1

Metric	Value
dl	0
loc	4
ccs	2
cts	2
cp	1
rs	10
cc	1
eloc	2
nc	1
nop	0
crap	1

<?php

/*
 * This file is part of the league/commonmark package.
 *
 * (c) Colin O'Dell <[email protected]>
 *
 * Original code based on the CommonMark JS reference parser (http://bitly.com/commonmark-js)
 *  - (c) John MacFarlane
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace League\CommonMark\Util;

use League\CommonMark\Block\Element\HtmlBlock;

/**
 * Provides regular expressions and utilties for parsing Markdown
 *
 * Singletons are generally bad, but it allows us to build the regexes once (and only once).
 */
class RegexHelper
{
    const ESCAPABLE = 0;
    const ESCAPED_CHAR = 1;
    const IN_DOUBLE_QUOTES = 2;
    const IN_SINGLE_QUOTES = 3;
    const IN_PARENS = 4;
    const REG_CHAR = 5;
    const IN_PARENS_NOSP = 6;
    const TAGNAME = 7;
    const BLOCKTAGNAME = 8;
    const ATTRIBUTENAME = 9;
    const UNQUOTEDVALUE = 10;
    const SINGLEQUOTEDVALUE = 11;
    const DOUBLEQUOTEDVALUE = 12;
    const ATTRIBUTEVALUE = 13;
    const ATTRIBUTEVALUESPEC = 14;
    const ATTRIBUTE = 15;
    const OPENTAG = 16;
    const CLOSETAG = 17;
    const OPENBLOCKTAG = 18;
    const CLOSEBLOCKTAG = 19;
    const HTMLCOMMENT = 20;
    const PROCESSINGINSTRUCTION = 21;
    const DECLARATION = 22;
    const CDATA = 23;
    const HTMLTAG = 24;
    const HTMLBLOCKOPEN = 25;
    const LINK_TITLE = 26;

    const REGEX_ESCAPABLE = '[!"#$%&\'()*+,.\/:;<=>?@[\\\\\]^_`{|}~-]';
    const REGEX_ENTITY = '&(?:#x[a-f0-9]{1,8}|#[0-9]{1,8}|[a-z][a-z0-9]{1,31});';
    const REGEX_PUNCTUATION = '/^[\x{2000}-\x{206F}\x{2E00}-\x{2E7F}\\\\\'!"#\$%&\(\)\*\+,\-\.\\/:;<=>\?@\[\]\^_`\{\|\}~]/u';
    const REGEX_UNSAFE_PROTOCOL = '/^javascript:|vbscript:|file:|data:/i';
    const REGEX_SAFE_DATA_PROTOCOL = '/^data:image\/(?:png|gif|jpeg|webp)/i';

    protected $regex = [];

    protected static $instance;

    /**
     * Constructor
     */
    protected function __construct()
    {
        $this->buildRegexPatterns();
    }

    /**
     * @return RegexHelper
     */
    public static function getInstance()
    {
        if (self::$instance === null) {
            self::$instance = new self();
        }

        return self::$instance;
    }

    /**
     * Builds the regular expressions required to parse Markdown
     *
     * We could hard-code them all as pre-built constants, but that would be more difficult to manage.
     */
    protected function buildRegexPatterns()
    {
        $regex = [];
        $regex[self::ESCAPABLE] = self::REGEX_ESCAPABLE;
        $regex[self::ESCAPED_CHAR] = '\\\\' . $regex[self::ESCAPABLE];
        $regex[self::IN_DOUBLE_QUOTES] = '"(' . $regex[self::ESCAPED_CHAR] . '|[^"\x00])*"';
        $regex[self::IN_SINGLE_QUOTES] = '\'(' . $regex[self::ESCAPED_CHAR] . '|[^\'\x00])*\'';
        $regex[self::IN_PARENS] = '\\((' . $regex[self::ESCAPED_CHAR] . '|[^)\x00])*\\)';
        $regex[self::REG_CHAR] = '[^\\\\()\x00-\x20]';
        $regex[self::IN_PARENS_NOSP] = '\((' . $regex[self::REG_CHAR] . '|' . $regex[self::ESCAPED_CHAR] . '|\\\\)*\)';
        $regex[self::TAGNAME] = '[A-Za-z][A-Za-z0-9-]*';
        $regex[self::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|meta|nav|noframes|ol|optgroup|option|p|param|section|source|title|summary|table|tbody|td|tfoot|th|thead|title|tr|track|ul)';
        $regex[self::ATTRIBUTENAME] = '[a-zA-Z_:][a-zA-Z0-9:._-]*';
        $regex[self::UNQUOTEDVALUE] = '[^"\'=<>`\x00-\x20]+';
        $regex[self::SINGLEQUOTEDVALUE] = '\'[^\']*\'';
        $regex[self::DOUBLEQUOTEDVALUE] = '"[^"]*"';
        $regex[self::ATTRIBUTEVALUE] = '(?:' . $regex[self::UNQUOTEDVALUE] . '|' . $regex[self::SINGLEQUOTEDVALUE] . '|' . $regex[self::DOUBLEQUOTEDVALUE] . ')';
        $regex[self::ATTRIBUTEVALUESPEC] = '(?:' . '\s*=' . '\s*' . $regex[self::ATTRIBUTEVALUE] . ')';
        $regex[self::ATTRIBUTE] = '(?:' . '\s+' . $regex[self::ATTRIBUTENAME] . $regex[self::ATTRIBUTEVALUESPEC] . '?)';
        $regex[self::OPENTAG] = '<' . $regex[self::TAGNAME] . $regex[self::ATTRIBUTE] . '*' . '\s*\/?>';
        $regex[self::CLOSETAG] = '<\/' . $regex[self::TAGNAME] . '\s*[>]';
        $regex[self::OPENBLOCKTAG] = '<' . $regex[self::BLOCKTAGNAME] . $regex[self::ATTRIBUTE] . '*' . '\s*\/?>';
        $regex[self::CLOSEBLOCKTAG] = '<\/' . $regex[self::BLOCKTAGNAME] . '\s*[>]';
        $regex[self::HTMLCOMMENT] = '<!---->|<!--(?:-?[^>-])(?:-?[^-])*-->';
        $regex[self::PROCESSINGINSTRUCTION] = '[<][?].*?[?][>]';
        $regex[self::DECLARATION] = '<![A-Z]+' . '\s+[^>]*>';
        $regex[self::CDATA] = '<!\[CDATA\[[\s\S]*?]\]>';
        $regex[self::HTMLTAG] = '(?:' . $regex[self::OPENTAG] . '|' . $regex[self::CLOSETAG] . '|' . $regex[self::HTMLCOMMENT] . '|' .
            $regex[self::PROCESSINGINSTRUCTION] . '|' . $regex[self::DECLARATION] . '|' . $regex[self::CDATA] . ')';
        $regex[self::HTMLBLOCKOPEN] = '<(?:' . $regex[self::BLOCKTAGNAME] . '(?:[\s\/>]|$)' . '|' .
            '\/' . $regex[self::BLOCKTAGNAME] . '(?:[\s>]|$)' . '|' . '[?!])';
        $regex[self::LINK_TITLE] = '^(?:"(' . $regex[self::ESCAPED_CHAR] . '|[^"\x00])*"' .
            '|' . '\'(' . $regex[self::ESCAPED_CHAR] . '|[^\'\x00])*\'' .
            '|' . '\((' . $regex[self::ESCAPED_CHAR] . '|[^)\x00])*\))';

        $this->regex = $regex;
    }

    /**
     * Returns a partial regex
     *
     * It'll need to be wrapped with /.../ before use
     *
     * @param int $const
     *
     * @return string
     */
    public function getPartialRegex($const)
    {
        return $this->regex[$const];
    }

    /**
     * @return string
     */
    public function getHtmlTagRegex()
    {
        return '/^' . $this->regex[self::HTMLTAG] . '/i';
    }

    /**
     * @return string
     */
    public function getLinkTitleRegex()
    {
        return '/' . $this->regex[self::LINK_TITLE] . '/';
    }

    /**
     * @return string
     */
    public function getLinkDestinationRegex()
    {
        return '/^' . '(?:' . $this->regex[self::REG_CHAR] . '+|' . $this->regex[self::ESCAPED_CHAR] . '|\\\\|' . $this->regex[self::IN_PARENS_NOSP] . ')*' . '/';
    }

    /**
     * @return string
     */
    public function getLinkDestinationBracesRegex()
    {
        return '/^(?:' . '[<](?:[^<>\\n\\\\\\x00]' . '|' . $this->regex[self::ESCAPED_CHAR] . '|' . '\\\\)*[>]' . ')/';
    }

    /**
     * @return string
     */
    public function getThematicBreakRegex()
    {
        return '/^(?:(?:\* *){3,}|(?:_ *){3,}|(?:- *){3,}) *$/';
    }

    /**
     * Attempt to match a regex in string s at offset offset
     *
     * @param string $regex
     * @param string $string
     * @param int    $offset
     *
     * @return int|null Index of match, or null
     */
    public static function matchAt($regex, $string, $offset = 0)
    {
        $matches = [];
        $string = mb_substr($string, $offset, null, 'utf-8');
        if (!preg_match($regex, $string, $matches, PREG_OFFSET_CAPTURE)) {
            return;
        }

        // PREG_OFFSET_CAPTURE always returns the byte offset, not the char offset, which is annoying
        $charPos = mb_strlen(mb_strcut($string, 0, $matches[0][1], 'utf-8'), 'utf-8');

        return $offset + $charPos;
    }

    /**
     * Functional wrapper around preg_match_all
     *
     * @param string $pattern
     * @param string $subject
     * @param int    $offset
     *
     * @return array|null
     */
    public static function matchAll($pattern, $subject, $offset = 0)
    {
        $matches = [];
        $subject = substr($subject, $offset);
        preg_match_all($pattern, $subject, $matches, PREG_PATTERN_ORDER);

        $fullMatches = reset($matches);
        if (empty($fullMatches)) {
            return;
        }

        if (count($fullMatches) === 1) {
            foreach ($matches as &$match) {
                $match = reset($match);
            }
        }

        if (!empty($matches)) {
            return $matches;
        }
    }

    /**
     * Replace backslash escapes with literal characters
     *
     * @param string $string
     *
     * @return string
     */
    public static function unescape($string)
    {
        $allEscapedChar = '/\\\\(' . self::REGEX_ESCAPABLE . ')/';

        $escaped = preg_replace($allEscapedChar, '$1', $string);
        $replaced = preg_replace_callback('/' . self::REGEX_ENTITY . '/i', function ($e) {
            return Html5Entities::decodeEntity($e[0]);
        }, $escaped);

        return $replaced;
    }

    /**
     * @param int $type HTML block type
     *
     * @return string|null
     */
    public static function getHtmlBlockOpenRegex($type)
    {
        switch ($type) {
            case HtmlBlock::TYPE_1_CODE_CONTAINER:
                return '/^<(?:script|pre|style)(?:\s|>|$)/i';
            case HtmlBlock::TYPE_2_COMMENT:
                return '/^<!--/';
            case HtmlBlock::TYPE_3:
                return '/^<[?]/';
            case HtmlBlock::TYPE_4:
                return '/^<![A-Z]/';
            case HtmlBlock::TYPE_5_CDATA:
                return '/^<!\[CDATA\[/';
            case HtmlBlock::TYPE_6_BLOCK_ELEMENT:
                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|h1|head|header|hr|html|legend|li|link|main|menu|menuitem|meta|nav|noframes|ol|optgroup|option|p|param|pre|section|source|title|summary|table|tbody|td|tfoot|th|thead|title|tr|track|ul)(?:\s|[/]?[>]|$)%i';
            case HtmlBlock::TYPE_7_MISC_ELEMENT:
                $self = self::getInstance();

                return '/^(?:' . $self->getPartialRegex(self::OPENTAG) . '|' . $self->getPartialRegex(self::CLOSETAG) . ')\\s*$/i';
        }
    }

    /**
     * @param int $type HTML block type
     *
     * @return string|null
     */
    public static function getHtmlBlockCloseRegex($type)
    {
        switch ($type) {
            case HtmlBlock::TYPE_1_CODE_CONTAINER:
                return '%<\/(?:script|pre|style)>%i';
            case HtmlBlock::TYPE_2_COMMENT:
                return '/-->/';
            case HtmlBlock::TYPE_3:
                return '/\?>/';
            case HtmlBlock::TYPE_4:
                return '/>/';
            case HtmlBlock::TYPE_5_CDATA:
                return '/\]\]>/';
        }
    }

    /**
     * @param string $url
     *
     * @return bool
     */
    public static function isLinkPotentiallyUnsafe($url)
    {
        return preg_match(self::REGEX_UNSAFE_PROTOCOL, $url) !== 0 && preg_match(self::REGEX_SAFE_DATA_PROTOCOL, $url) === 0;
    }
}


1		<?php
2
3		/*
4		* This file is part of the league/commonmark package.
5		*
6		* (c) Colin O'Dell <[email protected]>
7		*
8		* Original code based on the CommonMark JS reference parser (http://bitly.com/commonmark-js)
9		* - (c) John MacFarlane
10		*
11		* For the full copyright and license information, please view the LICENSE
12		* file that was distributed with this source code.
13		*/
14
15		namespace League\CommonMark\Util;
16
17		use League\CommonMark\Block\Element\HtmlBlock;
18
19		/**
20		* Provides regular expressions and utilties for parsing Markdown
21		*
22		* Singletons are generally bad, but it allows us to build the regexes once (and only once).
23		*/
24		class RegexHelper
25		{
26		const ESCAPABLE = 0;
27		const ESCAPED_CHAR = 1;
28		const IN_DOUBLE_QUOTES = 2;
29		const IN_SINGLE_QUOTES = 3;
30		const IN_PARENS = 4;
31		const REG_CHAR = 5;
32		const IN_PARENS_NOSP = 6;
33		const TAGNAME = 7;
34		const BLOCKTAGNAME = 8;
35		const ATTRIBUTENAME = 9;
36		const UNQUOTEDVALUE = 10;
37		const SINGLEQUOTEDVALUE = 11;
38		const DOUBLEQUOTEDVALUE = 12;
39		const ATTRIBUTEVALUE = 13;
40		const ATTRIBUTEVALUESPEC = 14;
41		const ATTRIBUTE = 15;
42		const OPENTAG = 16;
43		const CLOSETAG = 17;
44		const OPENBLOCKTAG = 18;
45		const CLOSEBLOCKTAG = 19;
46		const HTMLCOMMENT = 20;
47		const PROCESSINGINSTRUCTION = 21;
48		const DECLARATION = 22;
49		const CDATA = 23;
50		const HTMLTAG = 24;
51		const HTMLBLOCKOPEN = 25;
52		const LINK_TITLE = 26;
53
54		const REGEX_ESCAPABLE = '[!"#$%&\'()*+,.\/:;<=>?@[\\\\\]^_`{\|}~-]';
55		const REGEX_ENTITY = '&(?:#x[a-f0-9]{1,8}\|#[0-9]{1,8}\|[a-z][a-z0-9]{1,31});';
56		const REGEX_PUNCTUATION = '/^[\x{2000}-\x{206F}\x{2E00}-\x{2E7F}\\\\\'!"#\$%&\(\)\*\+,\-\.\\/:;<=>\?@\[\]\^_`\{\\|\}~]/u';
57		const REGEX_UNSAFE_PROTOCOL = '/^javascript:\|vbscript:\|file:\|data:/i';
58		const REGEX_SAFE_DATA_PROTOCOL = '/^data:image\/(?:png\|gif\|jpeg\|webp)/i';
59
60		protected $regex = [];
61
62		protected static $instance;
63
64		/**
65		* Constructor
66		*/
67	3	protected function __construct()
68		{
69	3	$this->buildRegexPatterns();
70	3	}
71
72		/**
73		* @return RegexHelper
74		*/
75	1746	public static function getInstance()
76		{
77	1746	if (self::$instance === null) {
78	3	self::$instance = new self();
79	3	}
80
81	1746	return self::$instance;
82		}
83
84		/**
85		* Builds the regular expressions required to parse Markdown
86		*
87		* We could hard-code them all as pre-built constants, but that would be more difficult to manage.
88		*/
89	3	protected function buildRegexPatterns()
90		{
91	3	$regex = [];
92	3	$regex[self::ESCAPABLE] = self::REGEX_ESCAPABLE;
93	3	$regex[self::ESCAPED_CHAR] = '\\\\' . $regex[self::ESCAPABLE];
94	3	$regex[self::IN_DOUBLE_QUOTES] = '"(' . $regex[self::ESCAPED_CHAR] . '\|[^"\x00])*"';
95	3	$regex[self::IN_SINGLE_QUOTES] = '\'(' . $regex[self::ESCAPED_CHAR] . '\|[^\'\x00])*\'';
96	3	$regex[self::IN_PARENS] = '\\((' . $regex[self::ESCAPED_CHAR] . '\|[^)\x00])*\\)';
97	3	$regex[self::REG_CHAR] = '[^\\\\()\x00-\x20]';
98	3	$regex[self::IN_PARENS_NOSP] = '\((' . $regex[self::REG_CHAR] . '\|' . $regex[self::ESCAPED_CHAR] . '\|\\\\)*\)';
99	3	$regex[self::TAGNAME] = '[A-Za-z][A-Za-z0-9-]*';
100	3	$regex[self::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\|meta\|nav\|noframes\|ol\|optgroup\|option\|p\|param\|section\|source\|title\|summary\|table\|tbody\|td\|tfoot\|th\|thead\|title\|tr\|track\|ul)';
101	3	$regex[self::ATTRIBUTENAME] = '[a-zA-Z_:][a-zA-Z0-9:._-]*';
102	3	$regex[self::UNQUOTEDVALUE] = '[^"\'=<>`\x00-\x20]+';
103	3	$regex[self::SINGLEQUOTEDVALUE] = '\'[^\']*\'';
104	3	$regex[self::DOUBLEQUOTEDVALUE] = '"[^"]*"';
105	3	$regex[self::ATTRIBUTEVALUE] = '(?:' . $regex[self::UNQUOTEDVALUE] . '\|' . $regex[self::SINGLEQUOTEDVALUE] . '\|' . $regex[self::DOUBLEQUOTEDVALUE] . ')';
106	3	$regex[self::ATTRIBUTEVALUESPEC] = '(?:' . '\s=' . '\s' . $regex[self::ATTRIBUTEVALUE] . ')';
107	3	$regex[self::ATTRIBUTE] = '(?:' . '\s+' . $regex[self::ATTRIBUTENAME] . $regex[self::ATTRIBUTEVALUESPEC] . '?)';
108	3	$regex[self::OPENTAG] = '<' . $regex[self::TAGNAME] . $regex[self::ATTRIBUTE] . '' . '\s\/?>';
109	3	$regex[self::CLOSETAG] = '<\/' . $regex[self::TAGNAME] . '\s*[>]';
110	3	$regex[self::OPENBLOCKTAG] = '<' . $regex[self::BLOCKTAGNAME] . $regex[self::ATTRIBUTE] . '' . '\s\/?>';
111	3	$regex[self::CLOSEBLOCKTAG] = '<\/' . $regex[self::BLOCKTAGNAME] . '\s*[>]';
112	3	$regex[self::HTMLCOMMENT] = '<!---->\|<!--(?:-?[^>-])(?:-?[^-])*-->';
113	3	$regex[self::PROCESSINGINSTRUCTION] = '[<][?].*?[?][>]';
114	3	$regex[self::DECLARATION] = '<![A-Z]+' . '\s+[^>]*>';
115	3	$regex[self::CDATA] = '<!\[CDATA\[[\s\S]*?]\]>';
116	3	$regex[self::HTMLTAG] = '(?:' . $regex[self::OPENTAG] . '\|' . $regex[self::CLOSETAG] . '\|' . $regex[self::HTMLCOMMENT] . '\|' .
117	3	$regex[self::PROCESSINGINSTRUCTION] . '\|' . $regex[self::DECLARATION] . '\|' . $regex[self::CDATA] . ')';
118	3	$regex[self::HTMLBLOCKOPEN] = '<(?:' . $regex[self::BLOCKTAGNAME] . '(?:[\s\/>]\|$)' . '\|' .
119	3	'\/' . $regex[self::BLOCKTAGNAME] . '(?:[\s>]\|$)' . '\|' . '[?!])';
120	3	$regex[self::LINK_TITLE] = '^(?:"(' . $regex[self::ESCAPED_CHAR] . '\|[^"\x00])*"' .
121	3	'\|' . '\'(' . $regex[self::ESCAPED_CHAR] . '\|[^\'\x00])*\'' .
122	3	'\|' . '\((' . $regex[self::ESCAPED_CHAR] . '\|[^)\x00])*\))';
123
124	3	$this->regex = $regex;
125	3	}
126
127		/**
128		* Returns a partial regex
129		*
130		* It'll need to be wrapped with /.../ before use
131		*
132		* @param int $const
133		*
134		* @return string
135		*/
136	582	public function getPartialRegex($const)
137		{
138	582	return $this->regex[$const];
139		}
140
141		/**
142		* @return string
143		*/
144	120	public function getHtmlTagRegex()
145		{
146	120	return '/^' . $this->regex[self::HTMLTAG] . '/i';
147		}
148
149		/**
150		* @return string
151		*/
152	258	public function getLinkTitleRegex()
153		{
154	258	return '/' . $this->regex[self::LINK_TITLE] . '/';
155		}
156
157		/**
158		* @return string
159		*/
160	357	public function getLinkDestinationRegex()
161		{
162	357	return '/^' . '(?:' . $this->regex[self::REG_CHAR] . '+\|' . $this->regex[self::ESCAPED_CHAR] . '\|\\\\\|' . $this->regex[self::IN_PARENS_NOSP] . ')*' . '/';
163		}
164
165		/**
166		* @return string
167		*/
168	372	public function getLinkDestinationBracesRegex()
169		{
170	372	return '/^(?:' . '[<](?:[^<>\\n\\\\\\x00]' . '\|' . $this->regex[self::ESCAPED_CHAR] . '\|' . '\\\\)*[>]' . ')/';
171		}
172
173		/**
174		* @return string
175		*/
176	1620	public function getThematicBreakRegex()
177		{
178	1620	return '/^(?:(?:\* ){3,}\|(?:_ ){3,}\|(?:- ){3,}) $/';
179		}
180
181		/**
182		* Attempt to match a regex in string s at offset offset
183		*
184		* @param string $regex
185		* @param string $string
186		* @param int $offset
187		*
188		* @return int\|null Index of match, or null
189		*/
190	1725	public static function matchAt($regex, $string, $offset = 0)
191		{
192	1725	$matches = [];
193	1725	$string = mb_substr($string, $offset, null, 'utf-8');
194	1725	if (!preg_match($regex, $string, $matches, PREG_OFFSET_CAPTURE)) {
195	1659	return;
196		}
197
198		// PREG_OFFSET_CAPTURE always returns the byte offset, not the char offset, which is annoying
199	237	$charPos = mb_strlen(mb_strcut($string, 0, $matches[0][1], 'utf-8'), 'utf-8');
200
201	237	return $offset + $charPos;
202		}
203
204		/**
205		* Functional wrapper around preg_match_all
206		*
207		* @param string $pattern
208		* @param string $subject
209		* @param int $offset
210		*
211		* @return array\|null
212		*/
213	1818	public static function matchAll($pattern, $subject, $offset = 0)
214		{
215	1818	$matches = [];
216	1818	$subject = substr($subject, $offset);
217	1818	preg_match_all($pattern, $subject, $matches, PREG_PATTERN_ORDER);
218
219	1818	$fullMatches = reset($matches);
220	1818	if (empty($fullMatches)) {
221	1779	return;
222		}
223
224	627	if (count($fullMatches) === 1) {
225	627	foreach ($matches as &$match) {
226	627	$match = reset($match);
227	627	}
228	627	}
229
230	627	if (!empty($matches)) {
231	627	return $matches;
232		}
233		}
234
235		/**
236		* Replace backslash escapes with literal characters
237		*
238		* @param string $string
239		*
240		* @return string
241		*/
242	480	public static function unescape($string)
243		{
244	480	$allEscapedChar = '/\\\\(' . self::REGEX_ESCAPABLE . ')/';
245
246	480	$escaped = preg_replace($allEscapedChar, '$1', $string);
247	480	$replaced = preg_replace_callback('/' . self::REGEX_ENTITY . '/i', function ($e) {
248	15	return Html5Entities::decodeEntity($e[0]);
249	480	}, $escaped);
250
251	480	return $replaced;
252		}
253
254		/**
255		* @param int $type HTML block type
256		*
257		* @return string\|null
258		*/
259	240	public static function getHtmlBlockOpenRegex($type)
260		{
261		switch ($type) {
262	240	case HtmlBlock::TYPE_1_CODE_CONTAINER:
263	240	return '/^<(?:script\|pre\|style)(?:\s\|>\|$)/i';
264	222	case HtmlBlock::TYPE_2_COMMENT:
265	222	return '/^<!--/';
266	213	case HtmlBlock::TYPE_3:
267	213	return '/^<[?]/';
268	210	case HtmlBlock::TYPE_4:
269	210	return '/^<![A-Z]/';
270	207	case HtmlBlock::TYPE_5_CDATA:
271	207	return '/^<!\[CDATA\[/';
272	204	case HtmlBlock::TYPE_6_BLOCK_ELEMENT:
273	204	return '%^<[/]?(?:address\|article\|aside\|base\|basefont\|blockquote\|body\|caption\|center\|col\|colgroup\|dd\|details\|dialog\|dir\|div\|dl\|dt\|fieldset\|figcaption\|figure\|footer\|form\|frame\|frameset\|h1\|head\|header\|hr\|html\|legend\|li\|link\|main\|menu\|menuitem\|meta\|nav\|noframes\|ol\|optgroup\|option\|p\|param\|pre\|section\|source\|title\|summary\|table\|tbody\|td\|tfoot\|th\|thead\|title\|tr\|track\|ul)(?:\s\|[/]?[>]\|$)%i';
274	138	case HtmlBlock::TYPE_7_MISC_ELEMENT:
275	138	$self = self::getInstance();
276
277	138	return '/^(?:' . $self->getPartialRegex(self::OPENTAG) . '\|' . $self->getPartialRegex(self::CLOSETAG) . ')\\s*$/i';
278		}
279		}
280
281		/**
282		* @param int $type HTML block type
283		*
284		* @return string\|null
285		*/
286	42	public static function getHtmlBlockCloseRegex($type)
287		{
288		switch ($type) {
289	42	case HtmlBlock::TYPE_1_CODE_CONTAINER:
290	24	return '%<\/(?:script\|pre\|style)>%i';
291	18	case HtmlBlock::TYPE_2_COMMENT:
292	9	return '/-->/';
293	9	case HtmlBlock::TYPE_3:
294	3	return '/\?>/';
295	6	case HtmlBlock::TYPE_4:
296	3	return '/>/';
297	3	case HtmlBlock::TYPE_5_CDATA:
298	3	return '/\]\]>/';
299		}
300		}
301
302		/**
303		* @param string $url
304		*
305		* @return bool
306		*/
307	3	public static function isLinkPotentiallyUnsafe($url)
308		{
309	3	return preg_match(self::REGEX_UNSAFE_PROTOCOL, $url) !== 0 && preg_match(self::REGEX_SAFE_DATA_PROTOCOL, $url) === 0;
310		}
311		}
312

thephpleague / commonmark

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RegexHelper::getThematicBreakRegex() A

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