Verzeichnisstruktur phpBB-3.3.16
- Veröffentlicht
- 27.04.2026
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AVTHelper.php
001 <?php
002
003 /**
004 * @package s9e\TextFormatter
005 * @copyright Copyright (c) 2010-2022 The s9e authors
006 * @license http://www.opensource.org/licenses/mit-license.php The MIT License
007 */
008 namespace s9e\TextFormatter\Configurator\Helpers;
009
010 use DOMAttr;
011 use RuntimeException;
012
013 abstract class AVTHelper
014 {
015 /**
016 * Parse an attribute value template
017 *
018 * @link https://www.w3.org/TR/1999/REC-xslt-19991116#dt-attribute-value-template
019 *
020 * @param string $attrValue Attribute value
021 * @return array Array of tokens
022 */
023 public static function parse($attrValue)
024 {
025 preg_match_all('((*MARK:literal)(?:[^{]|\\{\\{)++|(*MARK:expression)\\{(?:[^}"\']|"[^"]*+"|\'[^\']*+\')++\\}|(*MARK:junk).++)s', $attrValue, $matches);
026
027 $tokens = [];
028 foreach ($matches[0] as $i => $str)
029 {
030 if ($matches['MARK'][$i] === 'expression')
031 {
032 $tokens[] = ['expression', substr($str, 1, -1)];
033 }
034 else
035 {
036 $tokens[] = ['literal', strtr($str, ['{{' => '{', '}}' => '}'])];
037 }
038 }
039
040 return $tokens;
041 }
042
043 /**
044 * Replace the value of an attribute via the provided callback
045 *
046 * The callback will receive an array containing the type and value of each token in the AVT.
047 * Its return value should use the same format
048 *
049 * @param DOMAttr $attribute
050 * @param callable $callback
051 * @return void
052 */
053 public static function replace(DOMAttr $attribute, callable $callback)
054 {
055 $tokens = self::parse($attribute->value);
056 foreach ($tokens as $k => $token)
057 {
058 $tokens[$k] = $callback($token);
059 }
060
061 $attribute->value = htmlspecialchars(self::serialize($tokens), ENT_NOQUOTES, 'UTF-8');
062 }
063
064 /**
065 * Serialize an array of AVT tokens back into an attribute value
066 *
067 * @param array $tokens
068 * @return string
069 */
070 public static function serialize(array $tokens)
071 {
072 $attrValue = '';
073 foreach ($tokens as $token)
074 {
075 if ($token[0] === 'literal')
076 {
077 $attrValue .= preg_replace('([{}])', '$0$0', $token[1]);
078 }
079 elseif ($token[0] === 'expression')
080 {
081 $attrValue .= '{' . $token[1] . '}';
082 }
083 else
084 {
085 throw new RuntimeException('Unknown token type');
086 }
087 }
088
089 return $attrValue;
090 }
091
092 /**
093 * Transform given attribute value template into an XSL fragment
094 *
095 * @param string $attrValue
096 * @return string
097 */
098 public static function toXSL($attrValue)
099 {
100 $xsl = '';
101 foreach (self::parse($attrValue) as list($type, $content))
102 {
103 if ($type === 'expression')
104 {
105 $xsl .= '<xsl:value-of select="' . htmlspecialchars($content, ENT_COMPAT, 'UTF-8') . '"/>';
106 }
107 elseif (trim($content) !== $content)
108 {
109 $xsl .= '<xsl:text>' . htmlspecialchars($content, ENT_NOQUOTES, 'UTF-8') . '</xsl:text>';
110 }
111 else
112 {
113 $xsl .= htmlspecialchars($content, ENT_NOQUOTES, 'UTF-8');
114 }
115 }
116
117 return $xsl;
118 }
119 }