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<?php |
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namespace Thunder\Shortcode\Utility; |
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use Thunder\Shortcode\Syntax\SyntaxInterface; |
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/** |
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* @author Tomasz Kowalczyk <[email protected]> |
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*/ |
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final class RegexBuilderUtility |
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{ |
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/** @return string */ |
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public static function buildNameRegex() |
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{ |
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return '[a-zA-Z0-9-_\\*]+'; |
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} |
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/** @return string */ |
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public static function buildShortcodeRegex(SyntaxInterface $syntax) |
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{ |
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return '~('.self::createShortcodeRegexContent($syntax).')~us'; |
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} |
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/** @return string */ |
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public static function buildSingleShortcodeRegex(SyntaxInterface $syntax) |
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{ |
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return '~(\A'.self::createShortcodeRegexContent($syntax).'\Z)~us'; |
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} |
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/** @return string */ |
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public static function buildParametersRegex(SyntaxInterface $syntax) |
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{ |
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$equals = self::quote($syntax->getParameterValueSeparator()); |
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$string = self::quote($syntax->getParameterValueDelimiter()); |
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$space = '\s*'; |
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// lookahead test for either space or end of string |
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$empty = '(?=\s|$)'; |
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// equals sign and alphanumeric value |
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$simple = $space.$equals.$space.'[^\s]+'; |
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// equals sign and value without unescaped string delimiters enclosed in them |
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$complex = $space.$equals.$space.$string.'([^'.$string.'\\\\]*(?:\\\\.[^'.$string.'\\\\]*)*?)'.$string; |
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return '~(?:\s*(\w+(?:'.$complex.'|'.$simple.'|'.$empty.')))~us'; |
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} |
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/** @return string */ |
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private static function createShortcodeRegexContent(SyntaxInterface $syntax) |
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{ |
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$open = self::quote($syntax->getOpeningTag()); |
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$slash = self::quote($syntax->getClosingTagMarker()); |
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$close = self::quote($syntax->getClosingTag()); |
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$equals = self::quote($syntax->getParameterValueSeparator()); |
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$string = self::quote($syntax->getParameterValueDelimiter()); |
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$space = '\s*'; |
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// parameter and value separator can have any number of spaces around itself |
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$equalsSpaced = $space.$equals.$space; |
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// lookahead test for space, closing tag, self-closing tag or end of string |
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$empty = '(?=\s|'.$close.'|'.$slash.$space.$close.'|$)'; |
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// equals sign and alphanumeric value |
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$simple = '((?:(?!=\s*|'.$close.'|'.$slash.$close.')[^\s])+)'; |
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// equals sign and value without unescaped string delimiters enclosed in them |
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$complex = $string.'(?:[^'.$string.'\\\\]*(?:\\\\.[^'.$string.'\\\\]*)*)'.$string; |
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// complete parameters matching regex |
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$parameters = '(?<parameters>(?:\s*(?:\w+(?:'.$equalsSpaced.$complex.'|'.$equalsSpaced.$simple.'|'.$empty.')))*)'; |
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// BBCode is the part after name that makes it behave like a non-empty parameter value |
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$bbCode = '(?:'.$equals.$space.'(?<bbCode>'.$complex.'|'.$simple.'))?'; |
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// alphanumeric characters and dash |
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$name = '(?<name>'.static::buildNameRegex().')'; |
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// non-greedy match for any characters |
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$content = '(?<content>.*?)'; |
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// equal beginning for each variant: open tag, name and parameters |
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$common = $open.$space.$name.$space.$bbCode.$space.$parameters.$space; |
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// closing tag variants: just closing tag, self closing tag or content |
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// and closing block with backreference name validation |
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$justClosed = $close; |
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$selfClosed = '(?<marker>'.$slash.')'.$space.$close; |
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$withContent = $close.$content.$open.$space.'(?<markerContent>'.$slash.')'.$space.'(\k<name>)'.$space.$close; |
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return '(?:'.$common.'(?:'.$withContent.'|'.$justClosed.'|'.$selfClosed.'))'; |
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} |
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/** |
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* @param string $text |
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* |
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* @return string |
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*/ |
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private static function quote($text) |
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{ |
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return preg_replace('/(.)/us', '\\\\$0', $text); |
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} |
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} |
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thunderer /
Shortcode
