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<?php |
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declare(strict_types=1); |
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/* |
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* This file is part of the league/commonmark package. |
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* |
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* (c) Colin O'Dell <[email protected]> |
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* |
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* Original code based on the CommonMark JS reference parser (https://bitly.com/commonmark-js) |
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* - (c) John MacFarlane |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace League\CommonMark\Util; |
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use League\CommonMark\Extension\CommonMark\Node\Block\HtmlBlock; |
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/** |
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* Provides regular expressions and utilities for parsing Markdown |
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* |
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* All of the PARTIAL_ regex constants assume that they'll be used in case-insensitive searches |
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* All other complete regexes provided by this class (either via constants or methods) will have case-insensitivity enabled. |
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* |
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* @phpcs:disable Generic.Strings.UnnecessaryStringConcat.Found |
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* |
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* @psalm-immutable |
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*/ |
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final class RegexHelper |
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{ |
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// Partial regular expressions (wrap with `/` on each side and add the case-insensitive `i` flag before use) |
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public const PARTIAL_ENTITY = '&(?:#x[a-f0-9]{1,6}|#[0-9]{1,7}|[a-z][a-z0-9]{1,31});'; |
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public const PARTIAL_ESCAPABLE = '[!"#$%&\'()*+,.\/:;<=>?@[\\\\\]^_`{|}~-]'; |
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public const PARTIAL_ESCAPED_CHAR = '\\\\' . self::PARTIAL_ESCAPABLE; |
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public const PARTIAL_IN_DOUBLE_QUOTES = '"(' . self::PARTIAL_ESCAPED_CHAR . '|[^"\x00])*"'; |
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public const PARTIAL_IN_SINGLE_QUOTES = '\'(' . self::PARTIAL_ESCAPED_CHAR . '|[^\'\x00])*\''; |
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public const PARTIAL_IN_PARENS = '\\((' . self::PARTIAL_ESCAPED_CHAR . '|[^)\x00])*\\)'; |
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public const PARTIAL_REG_CHAR = '[^\\\\()\x00-\x20]'; |
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public const PARTIAL_IN_PARENS_NOSP = '\((' . self::PARTIAL_REG_CHAR . '|' . self::PARTIAL_ESCAPED_CHAR . '|\\\\)*\)'; |
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public const PARTIAL_TAGNAME = '[a-z][a-z0-9-]*'; |
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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)'; |
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public const PARTIAL_ATTRIBUTENAME = '[a-z_:][a-z0-9:._-]*'; |
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public const PARTIAL_UNQUOTEDVALUE = '[^"\'=<>`\x00-\x20]+'; |
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public const PARTIAL_SINGLEQUOTEDVALUE = '\'[^\']*\''; |
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public const PARTIAL_DOUBLEQUOTEDVALUE = '"[^"]*"'; |
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public const PARTIAL_ATTRIBUTEVALUE = '(?:' . self::PARTIAL_UNQUOTEDVALUE . '|' . self::PARTIAL_SINGLEQUOTEDVALUE . '|' . self::PARTIAL_DOUBLEQUOTEDVALUE . ')'; |
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public const PARTIAL_ATTRIBUTEVALUESPEC = '(?:' . '\s*=' . '\s*' . self::PARTIAL_ATTRIBUTEVALUE . ')'; |
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public const PARTIAL_ATTRIBUTE = '(?:' . '\s+' . self::PARTIAL_ATTRIBUTENAME . self::PARTIAL_ATTRIBUTEVALUESPEC . '?)'; |
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public const PARTIAL_OPENTAG = '<' . self::PARTIAL_TAGNAME . self::PARTIAL_ATTRIBUTE . '*' . '\s*\/?>'; |
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public const PARTIAL_CLOSETAG = '<\/' . self::PARTIAL_TAGNAME . '\s*[>]'; |
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public const PARTIAL_OPENBLOCKTAG = '<' . self::PARTIAL_BLOCKTAGNAME . self::PARTIAL_ATTRIBUTE . '*' . '\s*\/?>'; |
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public const PARTIAL_CLOSEBLOCKTAG = '<\/' . self::PARTIAL_BLOCKTAGNAME . '\s*[>]'; |
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public const PARTIAL_HTMLCOMMENT = '<!---->|<!--(?:-?[^>-])(?:-?[^-])*-->'; |
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public const PARTIAL_PROCESSINGINSTRUCTION = '[<][?].*?[?][>]'; |
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public const PARTIAL_DECLARATION = '<![A-Z]+' . '\s+[^>]*>'; |
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public const PARTIAL_CDATA = '<!\[CDATA\[[\s\S]*?]\]>'; |
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public const PARTIAL_HTMLTAG = '(?:' . self::PARTIAL_OPENTAG . '|' . self::PARTIAL_CLOSETAG . '|' . self::PARTIAL_HTMLCOMMENT . '|' . |
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self::PARTIAL_PROCESSINGINSTRUCTION . '|' . self::PARTIAL_DECLARATION . '|' . self::PARTIAL_CDATA . ')'; |
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public const PARTIAL_HTMLBLOCKOPEN = '<(?:' . self::PARTIAL_BLOCKTAGNAME . '(?:[\s\/>]|$)' . '|' . |
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'\/' . self::PARTIAL_BLOCKTAGNAME . '(?:[\s>]|$)' . '|' . '[?!])'; |
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public const PARTIAL_LINK_TITLE = '^(?:"(' . self::PARTIAL_ESCAPED_CHAR . '|[^"\x00])*"' . |
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'|' . '\'(' . self::PARTIAL_ESCAPED_CHAR . '|[^\'\x00])*\'' . |
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'|' . '\((' . self::PARTIAL_ESCAPED_CHAR . '|[^()\x00])*\))'; |
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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'; |
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public const REGEX_UNSAFE_PROTOCOL = '/^javascript:|vbscript:|file:|data:/i'; |
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public const REGEX_SAFE_DATA_PROTOCOL = '/^data:image\/(?:png|gif|jpeg|webp)/i'; |
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public const REGEX_NON_SPACE = '/[^ \t\f\v\r\n]/'; |
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public const REGEX_WHITESPACE_CHAR = '/^[ \t\n\x0b\x0c\x0d]/'; |
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public const REGEX_UNICODE_WHITESPACE_CHAR = '/^\pZ|\s/u'; |
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public const REGEX_THEMATIC_BREAK = '/^(?:(?:\*[ \t]*){3,}|(?:_[ \t]*){3,}|(?:-[ \t]*){3,})[ \t]*$/'; |
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public const REGEX_LINK_DESTINATION_BRACES = '/^(?:<(?:[^<>\\n\\\\\\x00]|\\\\.)*>)/'; |
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/** |
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* @psalm-pure |
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*/ |
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public static function isEscapable(string $character): bool |
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{ |
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return \preg_match('/' . self::PARTIAL_ESCAPABLE . '/', $character) === 1; |
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} |
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/** |
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* @psalm-pure |
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*/ |
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2928 |
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public static function isLetter(?string $character): bool |
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{ |
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if ($character === null) { |
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return false; |
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} |
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return \preg_match('/[\pL]/u', $character) === 1; |
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} |
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/** |
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* Attempt to match a regex in string s at offset offset |
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* |
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* @return int|null Index of match, or null |
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* |
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* @psalm-pure |
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*/ |
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public static function matchAt(string $regex, string $string, int $offset = 0): ?int |
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{ |
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1869 |
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$matches = []; |
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$string = \mb_substr($string, $offset, null, 'utf-8'); |
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if (! \preg_match($regex, $string, $matches, \PREG_OFFSET_CAPTURE)) { |
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return null; |
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} |
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// PREG_OFFSET_CAPTURE always returns the byte offset, not the char offset, which is annoying |
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$charPos = \mb_strlen(\mb_strcut($string, 0, $matches[0][1], 'utf-8'), 'utf-8'); |
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return $offset + $charPos; |
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} |
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/** |
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* Functional wrapper around preg_match_all which only returns the first set of matches |
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* |
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* @return string[]|null |
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* |
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* @psalm-pure |
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*/ |
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public static function matchFirst(string $pattern, string $subject, int $offset = 0): ?array |
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{ |
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if ($offset !== 0) { |
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$subject = \substr($subject, $offset); |
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} |
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\preg_match_all($pattern, $subject, $matches, \PREG_SET_ORDER); |
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if ($matches === []) { |
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return null; |
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} |
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return $matches[0] ?: null; |
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} |
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/** |
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* Replace backslash escapes with literal characters |
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* |
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* @psalm-pure |
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*/ |
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public static function unescape(string $string): string |
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{ |
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$allEscapedChar = '/\\\\(' . self::PARTIAL_ESCAPABLE . ')/'; |
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$escaped = \preg_replace($allEscapedChar, '$1', $string); |
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\assert(\is_string($escaped)); |
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return \preg_replace_callback('/' . self::PARTIAL_ENTITY . '/i', static function ($e) { |
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return Html5EntityDecoder::decode($e[0]); |
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}, $escaped); |
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} |
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/** |
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* @internal |
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* |
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* @param int $type HTML block type |
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* |
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* @psalm-pure |
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*/ |
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public static function getHtmlBlockOpenRegex(int $type): string |
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{ |
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switch ($type) { |
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case HtmlBlock::TYPE_1_CODE_CONTAINER: |
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return '/^<(?:script|pre|textarea|style)(?:\s|>|$)/i'; |
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case HtmlBlock::TYPE_2_COMMENT: |
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return '/^<!--/'; |
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case HtmlBlock::TYPE_3: |
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return '/^<[?]/'; |
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case HtmlBlock::TYPE_4: |
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return '/^<![A-Z]/i'; |
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case HtmlBlock::TYPE_5_CDATA: |
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return '/^<!\[CDATA\[/i'; |
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case HtmlBlock::TYPE_6_BLOCK_ELEMENT: |
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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'; |
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case HtmlBlock::TYPE_7_MISC_ELEMENT: |
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return '/^(?:' . self::PARTIAL_OPENTAG . '|' . self::PARTIAL_CLOSETAG . ')\\s*$/i'; |
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default: |
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throw new \InvalidArgumentException('Invalid HTML block type'); |
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} |
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} |
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/** |
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* @internal |
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* |
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* @param int $type HTML block type |
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* |
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* @psalm-pure |
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*/ |
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public static function getHtmlBlockCloseRegex(int $type): string |
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{ |
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switch ($type) { |
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case HtmlBlock::TYPE_1_CODE_CONTAINER: |
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return '%<\/(?:script|pre|textarea|style)>%i'; |
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case HtmlBlock::TYPE_2_COMMENT: |
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return '/-->/'; |
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case HtmlBlock::TYPE_3: |
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return '/\?>/'; |
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case HtmlBlock::TYPE_4: |
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return '/>/'; |
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case HtmlBlock::TYPE_5_CDATA: |
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return '/\]\]>/'; |
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default: |
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throw new \InvalidArgumentException('Invalid HTML block type'); |
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} |
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} |
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/** |
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* @psalm-pure |
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*/ |
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public static function isLinkPotentiallyUnsafe(string $url): bool |
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{ |
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return \preg_match(self::REGEX_UNSAFE_PROTOCOL, $url) !== 0 && \preg_match(self::REGEX_SAFE_DATA_PROTOCOL, $url) === 0; |
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} |
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} |
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thephpleague /
commonmark
