Verzeichnisstruktur phpBB-3.3.15
- Veröffentlicht
- 28.08.2024
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ParsedText.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\Plugins\Litedown\Parser;
009
010 class ParsedText
011 {
012 /**
013 * @var bool Whether to decode HTML entities when decoding text
014 */
015 public $decodeHtmlEntities = false;
016
017 /**
018 * @var bool Whether text contains escape characters
019 */
020 protected $hasEscapedChars = false;
021
022 /**
023 * @var bool Whether text contains link references
024 */
025 public $hasReferences = false;
026
027 /**
028 * @var array Array of [label => link info]
029 */
030 public $linkReferences = [];
031
032 /**
033 * @var string Text being parsed
034 */
035 protected $text;
036
037 /**
038 * @param string $text Original text
039 */
040 public function __construct($text)
041 {
042 if (strpos($text, '\\') !== false && preg_match('/\\\\[!"\'()*<>[\\\\\\]^_`~]/', $text))
043 {
044 $this->hasEscapedChars = true;
045
046 // Encode escaped literals that have a special meaning otherwise, so that we don't have
047 // to take them into account in regexps
048 $text = strtr(
049 $text,
050 [
051 '\\!' => "\x1B0", '\\"' => "\x1B1", "\\'" => "\x1B2", '\\(' => "\x1B3",
052 '\\)' => "\x1B4", '\\*' => "\x1B5", '\\<' => "\x1B6", '\\>' => "\x1B7",
053 '\\[' => "\x1B8", '\\\\' => "\x1B9", '\\]' => "\x1BA", '\\^' => "\x1BB",
054 '\\_' => "\x1BC", '\\`' => "\x1BD", '\\~' => "\x1BE"
055 ]
056 );
057 }
058
059 // We append a couple of lines and a non-whitespace character at the end of the text in
060 // order to trigger the closure of all open blocks such as quotes and lists
061 $this->text = $text . "\n\n\x17";
062 }
063
064 /**
065 * @return string
066 */
067 public function __toString()
068 {
069 return $this->text;
070 }
071
072 /**
073 * Return the character at given position
074 *
075 * @param integer $pos
076 * @return string
077 */
078 public function charAt($pos)
079 {
080 return $this->text[$pos];
081 }
082
083 /**
084 * Decode a chunk of encoded text to be used as an attribute value
085 *
086 * Decodes escaped literals and removes slashes and 0x1A characters
087 *
088 * @param string $str Encoded text
089 * @return string Decoded text
090 */
091 public function decode($str)
092 {
093 if ($this->decodeHtmlEntities && strpos($str, '&') !== false)
094 {
095 $str = html_entity_decode($str, ENT_QUOTES, 'UTF-8');
096 }
097 $str = str_replace("\x1A", '', $str);
098
099 if ($this->hasEscapedChars)
100 {
101 $str = strtr(
102 $str,
103 [
104 "\x1B0" => '!', "\x1B1" => '"', "\x1B2" => "'", "\x1B3" => '(',
105 "\x1B4" => ')', "\x1B5" => '*', "\x1B6" => '<', "\x1B7" => '>',
106 "\x1B8" => '[', "\x1B9" => '\\', "\x1BA" => ']', "\x1BB" => '^',
107 "\x1BC" => '_', "\x1BD" => '`', "\x1BE" => '~'
108 ]
109 );
110 }
111
112 return $str;
113 }
114
115 /**
116 * Find the first occurence of given substring starting at given position
117 *
118 * @param string $str
119 * @param integer $pos
120 * @return bool|integer
121 */
122 public function indexOf($str, $pos = 0)
123 {
124 return strpos($this->text, $str, $pos);
125 }
126
127 /**
128 * Test whether given position is preceded by whitespace
129 *
130 * @param integer $pos
131 * @return bool
132 */
133 public function isAfterWhitespace($pos)
134 {
135 return ($pos > 0 && $this->isWhitespace($this->text[$pos - 1]));
136 }
137
138 /**
139 * Test whether given character is alphanumeric
140 *
141 * @param string $chr
142 * @return bool
143 */
144 public function isAlnum($chr)
145 {
146 return (strpos(' abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789', $chr) > 0);
147 }
148
149 /**
150 * Test whether given position is followed by whitespace
151 *
152 * @param integer $pos
153 * @return bool
154 */
155 public function isBeforeWhitespace($pos)
156 {
157 return $this->isWhitespace($this->text[$pos + 1]);
158 }
159
160 /**
161 * Test whether a length of text is surrounded by alphanumeric characters
162 *
163 * @param integer $pos Start of the text
164 * @param integer $len Length of the text
165 * @return bool
166 */
167 public function isSurroundedByAlnum($pos, $len)
168 {
169 return ($pos > 0 && $this->isAlnum($this->text[$pos - 1]) && $this->isAlnum($this->text[$pos + $len]));
170 }
171
172 /**
173 * Test whether given character is an ASCII whitespace character
174 *
175 * NOTE: newlines are normalized to LF before parsing so we don't have to check for CR
176 *
177 * @param string $chr
178 * @return bool
179 */
180 public function isWhitespace($chr)
181 {
182 return (strpos(" \n\t", $chr) !== false);
183 }
184
185 /**
186 * Mark the boundary of a block in the original text
187 *
188 * @param integer $pos
189 * @return void
190 */
191 public function markBoundary($pos)
192 {
193 $this->text[$pos] = "\x17";
194 }
195
196 /**
197 * Overwrite part of the text with substitution characters ^Z (0x1A)
198 *
199 * @param integer $pos Start of the range
200 * @param integer $len Length of text to overwrite
201 * @return void
202 */
203 public function overwrite($pos, $len)
204 {
205 if ($len > 0)
206 {
207 $this->text = substr($this->text, 0, $pos) . str_repeat("\x1A", $len) . substr($this->text, $pos + $len);
208 }
209 }
210 }