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Edit File : RegexHelper.php \| Size : 9.64 KB
<?php /* * This file is part of the league/commonmark package. * * (c) Colin O'Dell <colinodell@gmail.com> * * Original code based on the CommonMark JS reference parser (https://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 utilities for parsing Markdown / final class RegexHelper { // Partial regular expressions (wrap with `/` on each side before use) public const PARTIAL_ENTITY = '&(?:#x[a-f0-9]{1,6}\|#[0-9]{1,7}\|[a-z][a-z0-9]{1,31});'; public const PARTIAL_ESCAPABLE = '[!"#$%&\'()+,.\/:;<=>?@[\\\\\]^_`{\|}~-]'; public const PARTIAL_ESCAPED_CHAR = '\\\\' . self::PARTIAL_ESCAPABLE; public const PARTIAL_IN_DOUBLE_QUOTES = '"(' . self::PARTIAL_ESCAPED_CHAR . '\|[^"\x00])"'; public const PARTIAL_IN_SINGLE_QUOTES = '\'(' . self::PARTIAL_ESCAPED_CHAR . '\|[^\'\x00])\''; public const PARTIAL_IN_PARENS = '\\((' . self::PARTIAL_ESCAPED_CHAR . '\|[^)\x00])\\)'; public const PARTIAL_REG_CHAR = '[^\\\\()\x00-\x20]'; public const PARTIAL_IN_PARENS_NOSP = '\((' . self::PARTIAL_REG_CHAR . '\|' . self::PARTIAL_ESCAPED_CHAR . '\|\\\\)\)'; public const PARTIAL_TAGNAME = '[A-Za-z][A-Za-z0-9-]'; 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)'; public const PARTIAL_ATTRIBUTENAME = '[a-zA-Z_:][a-zA-Z0-9:._-]'; public const PARTIAL_UNQUOTEDVALUE = '[^"\'=<>`\x00-\x20]+'; public const PARTIAL_SINGLEQUOTEDVALUE = '\'[^\']\''; public const PARTIAL_DOUBLEQUOTEDVALUE = '"[^"]"'; public const PARTIAL_ATTRIBUTEVALUE = '(?:' . self::PARTIAL_UNQUOTEDVALUE . '\|' . self::PARTIAL_SINGLEQUOTEDVALUE . '\|' . self::PARTIAL_DOUBLEQUOTEDVALUE . ')'; public const PARTIAL_ATTRIBUTEVALUESPEC = '(?:' . '\s=' . '\s' . self::PARTIAL_ATTRIBUTEVALUE . ')'; public const PARTIAL_ATTRIBUTE = '(?:' . '\s+' . self::PARTIAL_ATTRIBUTENAME . self::PARTIAL_ATTRIBUTEVALUESPEC . '?)'; public const PARTIAL_OPENTAG = '<' . self::PARTIAL_TAGNAME . self::PARTIAL_ATTRIBUTE . '' . '\s\/?>'; public const PARTIAL_CLOSETAG = '<\/' . self::PARTIAL_TAGNAME . '\s[>]'; public const PARTIAL_OPENBLOCKTAG = '<' . self::PARTIAL_BLOCKTAGNAME . self::PARTIAL_ATTRIBUTE . '' . '\s\/?>'; public const PARTIAL_CLOSEBLOCKTAG = '<\/' . self::PARTIAL_BLOCKTAGNAME . '\s[>]'; public const PARTIAL_HTMLCOMMENT = '<!---->\|<!--(?:-?[^>-])(?:-?[^-])-->'; public const PARTIAL_PROCESSINGINSTRUCTION = '[<][?].?[?][>]'; public const PARTIAL_DECLARATION = '<![A-Z]+' . '\s+[^>]>'; public const PARTIAL_CDATA = '<!\[CDATA\[[\s\S]?]\]>'; public const PARTIAL_HTMLTAG = '(?:' . self::PARTIAL_OPENTAG . '\|' . self::PARTIAL_CLOSETAG . '\|' . self::PARTIAL_HTMLCOMMENT . '\|' . self::PARTIAL_PROCESSINGINSTRUCTION . '\|' . self::PARTIAL_DECLARATION . '\|' . self::PARTIAL_CDATA . ')'; public const PARTIAL_HTMLBLOCKOPEN = '<(?:' . self::PARTIAL_BLOCKTAGNAME . '(?:[\s\/>]\|$)' . '\|' . '\/' . self::PARTIAL_BLOCKTAGNAME . '(?:[\s>]\|$)' . '\|' . '[?!])'; public const PARTIAL_LINK_TITLE = '^(?:"(' . self::PARTIAL_ESCAPED_CHAR . '\|[^"\x00])"' . '\|' . '\'(' . self::PARTIAL_ESCAPED_CHAR . '\|[^\'\x00])\'' . '\|' . '\((' . self::PARTIAL_ESCAPED_CHAR . '\|[^()\x00])\))'; 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'; public const REGEX_UNSAFE_PROTOCOL = '/^javascript:\|vbscript:\|file:\|data:/i'; public const REGEX_SAFE_DATA_PROTOCOL = '/^data:image\/(?:png\|gif\|jpeg\|webp)/i'; public const REGEX_NON_SPACE = '/[^ \t\f\v\r\n]/'; public const REGEX_WHITESPACE_CHAR = '/^[ \t\n\x0b\x0c\x0d]/'; public const REGEX_WHITESPACE = '/[ \t\n\x0b\x0c\x0d]+/'; public const REGEX_UNICODE_WHITESPACE_CHAR = '/^\pZ\|\s/u'; public const REGEX_THEMATIC_BREAK = '/^(?:\[ \t]){3,}$\|^(?:_[ \t]){3,}$\|^(?:-[ \t]){3,}$/'; public const REGEX_LINK_DESTINATION_BRACES = '/^(?:<(?:[^<>\\n\\\\\\x00]\|\\\\.)>)/'; public static function isEscapable(string $character): bool { return \preg_match('/' . self::PARTIAL_ESCAPABLE . '/', $character) === 1; } /* * 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(string $regex, string $string, int $offset = 0): ?int { $matches = []; $string = \mb_substr($string, $offset, null, 'utf-8'); if (!\preg_match($regex, $string, $matches, \PREG_OFFSET_CAPTURE)) { return null; } // 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<string>\|null * * @deprecated in 1.6; use matchFirst() instead / public static function matchAll(string $pattern, string $subject, int $offset = 0): ?array { @\trigger_error('RegexHelper::matchAll() is deprecated in league/commonmark 1.6 and will be removed in 2.0; use RegexHelper::matchFirst() instead', \E_USER_DEPRECATED); if ($offset !== 0) { $subject = \substr($subject, $offset); } \preg_match_all($pattern, $subject, $matches, \PREG_PATTERN_ORDER); $fullMatches = \reset($matches); if (empty($fullMatches)) { return null; } if (\count($fullMatches) === 1) { foreach ($matches as &$match) { $match = \reset($match); } } return $matches ?: null; } /* * Functional wrapper around preg_match_all which only returns the first set of matches * * @return string[]\|null * * @psalm-pure / public static function matchFirst(string $pattern, string $subject, int $offset = 0): ?array { if ($offset !== 0) { $subject = \substr($subject, $offset); } \preg_match_all($pattern, $subject, $matches, \PREG_SET_ORDER); if ($matches === []) { return null; } return $matches[0] ?: null; } /* * Replace backslash escapes with literal characters * * @param string $string * * @return string / public static function unescape(string $string): string { $allEscapedChar = '/\\\\(' . self::PARTIAL_ESCAPABLE . ')/'; /* @var string $escaped / $escaped = \preg_replace($allEscapedChar, '$1', $string); /* @var string $replaced / $replaced = \preg_replace_callback('/' . self::PARTIAL_ENTITY . '/i', function ($e) { return Html5EntityDecoder::decode($e[0]); }, $escaped); return $replaced; } /* * @param int $type HTML block type * * @return string * * @internal / public static function getHtmlBlockOpenRegex(int $type): string { switch ($type) { case HtmlBlock::TYPE_1_CODE_CONTAINER: return '/^<(?:script\|pre\|textarea\|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\[/'; case HtmlBlock::TYPE_6_BLOCK_ELEMENT: return '%^<[/]?(?:address\|article\|aside\|base\|basefont\|blockquote\|body\|caption\|center\|col\|colgroup\|dd\|details\|dialog\|dir\|div\|dl\|dt\|fieldset\|figcaption\|figure\|footer\|form\|frame\|frameset\|h[123456]\|head\|header\|hr\|html\|iframe\|legend\|li\|link\|main\|menu\|menuitem\|nav\|noframes\|ol\|optgroup\|option\|p\|param\|section\|source\|summary\|table\|tbody\|td\|tfoot\|th\|thead\|title\|tr\|track\|ul)(?:\s\|[/]?[>]\|$)%i'; case HtmlBlock::TYPE_7_MISC_ELEMENT: return '/^(?:' . self::PARTIAL_OPENTAG . '\|' . self::PARTIAL_CLOSETAG . ')\\s$/i'; } throw new \InvalidArgumentException('Invalid HTML block type'); } /** * @param int $type HTML block type * * @return string * * @internal */ public static function getHtmlBlockCloseRegex(int $type): string { switch ($type) { case HtmlBlock::TYPE_1_CODE_CONTAINER: return '%<\/(?:script\|pre\|textarea\|style)>%i'; case HtmlBlock::TYPE_2_COMMENT: return '/-->/'; case HtmlBlock::TYPE_3: return '/\?>/'; case HtmlBlock::TYPE_4: return '/>/'; case HtmlBlock::TYPE_5_CDATA: return '/\]\]>/'; } throw new \InvalidArgumentException('Invalid HTML block type'); } public static function isLinkPotentiallyUnsafe(string $url): bool { return \preg_match(self::REGEX_UNSAFE_PROTOCOL, $url) !== 0 && \preg_match(self::REGEX_SAFE_DATA_PROTOCOL, $url) === 0; } } Back

Edit File : RegexHelper.php | Size : 9.64 KB

<?php

/*
 * This file is part of the league/commonmark package.
 *
 * (c) Colin O'Dell <colinodell@gmail.com>
 *
 * Original code based on the CommonMark JS reference parser (https://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 utilities for parsing Markdown
 */
final class RegexHelper
{
    // Partial regular expressions (wrap with `/` on each side before use)
    public const PARTIAL_ENTITY = '&(?:#x[a-f0-9]{1,6}|#[0-9]{1,7}|[a-z][a-z0-9]{1,31});';
    public const PARTIAL_ESCAPABLE = '[!"#$%&\'()*+,.\/:;<=>?@[\\\\\]^_`{|}~-]';
    public const PARTIAL_ESCAPED_CHAR = '\\\\' . self::PARTIAL_ESCAPABLE;
    public const PARTIAL_IN_DOUBLE_QUOTES = '"(' . self::PARTIAL_ESCAPED_CHAR . '|[^"\x00])*"';
    public const PARTIAL_IN_SINGLE_QUOTES = '\'(' . self::PARTIAL_ESCAPED_CHAR . '|[^\'\x00])*\'';
    public const PARTIAL_IN_PARENS = '\$(' . self::PARTIAL_ESCAPED_CHAR . '|[^)\x00])*\$';
    public const PARTIAL_REG_CHAR = '[^\\\$)\x00-\x20]';
    public const PARTIAL_IN_PARENS_NOSP = '\((' . self::PARTIAL_REG_CHAR . '|' . self::PARTIAL_ESCAPED_CHAR . '|\\\$*\)';
    public const PARTIAL_TAGNAME = '[A-Za-z][A-Za-z0-9-]*';
    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)';
    public const PARTIAL_ATTRIBUTENAME = '[a-zA-Z_:][a-zA-Z0-9:._-]*';
    public const PARTIAL_UNQUOTEDVALUE = '[^"\'=<>`\x00-\x20]+';
    public const PARTIAL_SINGLEQUOTEDVALUE = '\'[^\']*\'';
    public const PARTIAL_DOUBLEQUOTEDVALUE = '"[^"]*"';
    public const PARTIAL_ATTRIBUTEVALUE = '(?:' . self::PARTIAL_UNQUOTEDVALUE . '|' . self::PARTIAL_SINGLEQUOTEDVALUE . '|' . self::PARTIAL_DOUBLEQUOTEDVALUE . ')';
    public const PARTIAL_ATTRIBUTEVALUESPEC = '(?:' . '\s*=' . '\s*' . self::PARTIAL_ATTRIBUTEVALUE . ')';
    public const PARTIAL_ATTRIBUTE = '(?:' . '\s+' . self::PARTIAL_ATTRIBUTENAME . self::PARTIAL_ATTRIBUTEVALUESPEC . '?)';
    public const PARTIAL_OPENTAG = '<' . self::PARTIAL_TAGNAME . self::PARTIAL_ATTRIBUTE . '*' . '\s*\/?>';
    public const PARTIAL_CLOSETAG = '<\/' . self::PARTIAL_TAGNAME . '\s*[>]';
    public const PARTIAL_OPENBLOCKTAG = '<' . self::PARTIAL_BLOCKTAGNAME . self::PARTIAL_ATTRIBUTE . '*' . '\s*\/?>';
    public const PARTIAL_CLOSEBLOCKTAG = '<\/' . self::PARTIAL_BLOCKTAGNAME . '\s*[>]';
    public const PARTIAL_HTMLCOMMENT = '|';
    public const PARTIAL_PROCESSINGINSTRUCTION = '[<][?].*?[?][>]';
    public const PARTIAL_DECLARATION = '<![A-Z]+' . '\s+[^>]*>';
    public const PARTIAL_CDATA = '<!\[CDATA\[[\s\S]*?]\]>';
    public const PARTIAL_HTMLTAG = '(?:' . self::PARTIAL_OPENTAG . '|' . self::PARTIAL_CLOSETAG . '|' . self::PARTIAL_HTMLCOMMENT . '|' .
        self::PARTIAL_PROCESSINGINSTRUCTION . '|' . self::PARTIAL_DECLARATION . '|' . self::PARTIAL_CDATA . ')';
    public const PARTIAL_HTMLBLOCKOPEN = '<(?:' . self::PARTIAL_BLOCKTAGNAME . '(?:[\s\/>]|$)' . '|' .
        '\/' . self::PARTIAL_BLOCKTAGNAME . '(?:[\s>]|$)' . '|' . '[?!])';
    public const PARTIAL_LINK_TITLE = '^(?:"(' . self::PARTIAL_ESCAPED_CHAR . '|[^"\x00])*"' .
        '|' . '\'(' . self::PARTIAL_ESCAPED_CHAR . '|[^\'\x00])*\'' .
        '|' . '$(' . self::PARTIAL_ESCAPED_CHAR . '|[^()\x00])*$)';

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';
    public const REGEX_UNSAFE_PROTOCOL = '/^javascript:|vbscript:|file:|data:/i';
    public const REGEX_SAFE_DATA_PROTOCOL = '/^data:image\/(?:png|gif|jpeg|webp)/i';
    public const REGEX_NON_SPACE = '/[^ \t\f\v\r\n]/';

public const REGEX_WHITESPACE_CHAR = '/^[ \t\n\x0b\x0c\x0d]/';
    public const REGEX_WHITESPACE = '/[ \t\n\x0b\x0c\x0d]+/';
    public const REGEX_UNICODE_WHITESPACE_CHAR = '/^\pZ|\s/u';
    public const REGEX_THEMATIC_BREAK = '/^(?:\*[ \t]*){3,}$|^(?:_[ \t]*){3,}$|^(?:-[ \t]*){3,}$/';
    public const REGEX_LINK_DESTINATION_BRACES = '/^(?:<(?:[^<>\\n\\\\\\x00]|\\\\.)*>)/';

public static function isEscapable(string $character): bool
    {
        return \preg_match('/' . self::PARTIAL_ESCAPABLE . '/', $character) === 1;
    }

/**
     * 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(string $regex, string $string, int $offset = 0): ?int
    {
        $matches = [];
        $string = \mb_substr($string, $offset, null, 'utf-8');
        if (!\preg_match($regex, $string, $matches, \PREG_OFFSET_CAPTURE)) {
            return null;
        }

// 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<string>|null
     *
     * @deprecated in 1.6; use matchFirst() instead
     */
    public static function matchAll(string $pattern, string $subject, int $offset = 0): ?array
    {
        @\trigger_error('RegexHelper::matchAll() is deprecated in league/commonmark 1.6 and will be removed in 2.0; use RegexHelper::matchFirst() instead', \E_USER_DEPRECATED);

if ($offset !== 0) {
            $subject = \substr($subject, $offset);
        }

\preg_match_all($pattern, $subject, $matches, \PREG_PATTERN_ORDER);

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

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

return $matches ?: null;
    }

/**
     * Functional wrapper around preg_match_all which only returns the first set of matches
     *
     * @return string[]|null
     *
     * @psalm-pure
     */
    public static function matchFirst(string $pattern, string $subject, int $offset = 0): ?array
    {
        if ($offset !== 0) {
            $subject = \substr($subject, $offset);
        }

\preg_match_all($pattern, $subject, $matches, \PREG_SET_ORDER);

if ($matches === []) {
            return null;
        }

return $matches[0] ?: null;
    }

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

/** @var string $escaped */
        $escaped = \preg_replace($allEscapedChar, '$1', $string);

/** @var string $replaced */
        $replaced = \preg_replace_callback('/' . self::PARTIAL_ENTITY . '/i', function ($e) {
            return Html5EntityDecoder::decode($e[0]);
        }, $escaped);

return $replaced;
    }

/**
     * @param int $type HTML block type
     *
     * @return string
     *
     * @internal
     */
    public static function getHtmlBlockOpenRegex(int $type): string
    {
        switch ($type) {
            case HtmlBlock::TYPE_1_CODE_CONTAINER:
                return '/^<(?:script|pre|textarea|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|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|[/]?[>]|$)%i';
            case HtmlBlock::TYPE_7_MISC_ELEMENT:
                return '/^(?:' . self::PARTIAL_OPENTAG . '|' . self::PARTIAL_CLOSETAG . ')\\s*$/i';
        }

throw new \InvalidArgumentException('Invalid HTML block type');
    }

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

throw new \InvalidArgumentException('Invalid HTML block type');
    }

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

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