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<?php |
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/** |
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* @package s9e\TextFormatter |
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* @copyright Copyright (c) 2010-2019 The s9e Authors |
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* @license http://www.opensource.org/licenses/mit-license.php The MIT License |
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*/ |
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namespace s9e\TextFormatter\Configurator\Helpers; |
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use DOMAttr; |
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use RuntimeException; |
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abstract class AVTHelper |
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{ |
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/** |
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* Parse an attribute value template |
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* |
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* @link https://www.w3.org/TR/1999/REC-xslt-19991116#dt-attribute-value-template |
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* |
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* @param string $attrValue Attribute value |
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* @return array Array of tokens |
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*/ |
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public static function parse($attrValue) |
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{ |
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preg_match_all('(\\{\\{|\\{(?:[^\'"}]|\'[^\']*\'|"[^"]*")+\\}|\\{|[^{]++)', $attrValue, $matches); |
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$tokens = []; |
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foreach ($matches[0] as $str) |
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{ |
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if ($str === '{{' || $str === '{') |
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{ |
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$tokens[] = ['literal', '{']; |
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} |
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elseif ($str[0] === '{') |
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{ |
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$tokens[] = ['expression', substr($str, 1, -1)]; |
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} |
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else |
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{ |
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$tokens[] = ['literal', str_replace('}}', '}', $str)]; |
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} |
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} |
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return $tokens; |
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} |
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/** |
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* Replace the value of an attribute via the provided callback |
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* |
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* The callback will receive an array containing the type and value of each token in the AVT. |
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* Its return value should use the same format |
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* |
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* @param DOMAttr $attribute |
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* @param callable $callback |
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* @return void |
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*/ |
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public static function replace(DOMAttr $attribute, callable $callback) |
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{ |
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$tokens = self::parse($attribute->value); |
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foreach ($tokens as $k => $token) |
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{ |
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$tokens[$k] = $callback($token); |
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} |
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$attribute->value = htmlspecialchars(self::serialize($tokens), ENT_NOQUOTES, 'UTF-8'); |
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} |
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/** |
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* Serialize an array of AVT tokens back into an attribute value |
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* |
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* @param array $tokens |
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* @return string |
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*/ |
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public static function serialize(array $tokens) |
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{ |
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$attrValue = ''; |
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foreach ($tokens as $token) |
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{ |
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if ($token[0] === 'literal') |
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{ |
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$attrValue .= preg_replace('([{}])', '$0$0', $token[1]); |
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} |
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elseif ($token[0] === 'expression') |
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{ |
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$attrValue .= '{' . $token[1] . '}'; |
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} |
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else |
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{ |
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throw new RuntimeException('Unknown token type'); |
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} |
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} |
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return $attrValue; |
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} |
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/** |
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* Transform given attribute value template into an XSL fragment |
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* |
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* @param string $attrValue |
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* @return string |
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*/ |
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public static function toXSL($attrValue) |
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{ |
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$xsl = ''; |
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foreach (self::parse($attrValue) as list($type, $content)) |
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{ |
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if ($type === 'expression') |
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{ |
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$xsl .= '<xsl:value-of select="' . htmlspecialchars($content, ENT_COMPAT, 'UTF-8') . '"/>'; |
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} |
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elseif (trim($content) !== $content) |
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{ |
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$xsl .= '<xsl:text>' . htmlspecialchars($content, ENT_NOQUOTES, 'UTF-8') . '</xsl:text>'; |
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} |
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else |
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{ |
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$xsl .= htmlspecialchars($content, ENT_NOQUOTES, 'UTF-8'); |
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} |
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} |
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return $xsl; |
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} |
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} |
s9e /
TextFormatter
