MDL-65759 library: Update php-css-parser to 8.3.0
[moodle.git] / lib / php-css-parser / Parsing / ParserState.php
1 <?php
2 namespace Sabberworm\CSS\Parsing;
4 use Sabberworm\CSS\Comment\Comment;
5 use Sabberworm\CSS\Parsing\UnexpectedTokenException;
6 use Sabberworm\CSS\Settings;
8 class ParserState {
9         private $oParserSettings;
11         private $sText;
13         private $aText;
14         private $iCurrentPosition;
15         private $sCharset;
16         private $iLength;
17         private $iLineNo;
19         public function __construct($sText, Settings $oParserSettings, $iLineNo = 1) {
20                 $this->oParserSettings = $oParserSettings;
21                 $this->sText = $sText;
22                 $this->iCurrentPosition = 0;
23                 $this->iLineNo = $iLineNo;
24                 $this->setCharset($this->oParserSettings->sDefaultCharset);
25         }
27         public function setCharset($sCharset) {
28                 $this->sCharset = $sCharset;
29                 $this->aText = $this->strsplit($this->sText);
30                 $this->iLength = count($this->aText);
31         }
33         public function getCharset() {
34                 $this->oParserHelper->getCharset();
35                 return $this->sCharset;
36         }
38         public function currentLine() {
39                 return $this->iLineNo;
40         }
42         public function getSettings() {
43                 return $this->oParserSettings;
44         }
46         public function parseIdentifier($bIgnoreCase = true) {
47                 $sResult = $this->parseCharacter(true);
48                 if ($sResult === null) {
49                         throw new UnexpectedTokenException($sResult, $this->peek(5), 'identifier', $this->iLineNo);
50                 }
51                 $sCharacter = null;
52                 while (($sCharacter = $this->parseCharacter(true)) !== null) {
53                         $sResult .= $sCharacter;
54                 }
55                 if ($bIgnoreCase) {
56                         $sResult = $this->strtolower($sResult);
57                 }
58                 return $sResult;
59         }
61         public function parseCharacter($bIsForIdentifier) {
62                 if ($this->peek() === '\\') {
63                         if ($bIsForIdentifier && $this->oParserSettings->bLenientParsing && ($this->comes('\0') || $this->comes('\9'))) {
64                                 // Non-strings can contain \0 or \9 which is an IE hack supported in lenient parsing.
65                                 return null;
66                         }
67                         $this->consume('\\');
68                         if ($this->comes('\n') || $this->comes('\r')) {
69                                 return '';
70                         }
71                         if (preg_match('/[0-9a-fA-F]/Su', $this->peek()) === 0) {
72                                 return $this->consume(1);
73                         }
74                         $sUnicode = $this->consumeExpression('/^[0-9a-fA-F]{1,6}/u', 6);
75                         if ($this->strlen($sUnicode) < 6) {
76                                 //Consume whitespace after incomplete unicode escape
77                                 if (preg_match('/\\s/isSu', $this->peek())) {
78                                         if ($this->comes('\r\n')) {
79                                                 $this->consume(2);
80                                         } else {
81                                                 $this->consume(1);
82                                         }
83                                 }
84                         }
85                         $iUnicode = intval($sUnicode, 16);
86                         $sUtf32 = "";
87                         for ($i = 0; $i < 4; ++$i) {
88                                 $sUtf32 .= chr($iUnicode & 0xff);
89                                 $iUnicode = $iUnicode >> 8;
90                         }
91                         return iconv('utf-32le', $this->sCharset, $sUtf32);
92                 }
93                 if ($bIsForIdentifier) {
94                         $peek = ord($this->peek());
95                         // Ranges: a-z A-Z 0-9 - _
96                         if (($peek >= 97 && $peek <= 122) ||
97                                 ($peek >= 65 && $peek <= 90) ||
98                                 ($peek >= 48 && $peek <= 57) ||
99                                 ($peek === 45) ||
100                                 ($peek === 95) ||
101                                 ($peek > 0xa1)) {
102                                 return $this->consume(1);
103                         }
104                 } else {
105                         return $this->consume(1);
106                 }
107                 return null;
108         }
110         public function consumeWhiteSpace() {
111                 $comments = array();
112                 do {
113                         while (preg_match('/\\s/isSu', $this->peek()) === 1) {
114                                 $this->consume(1);
115                         }
116                         if($this->oParserSettings->bLenientParsing) {
117                                 try {
118                                         $oComment = $this->consumeComment();
119                                 } catch(UnexpectedTokenException $e) {
120                                         // When we can’t find the end of a comment, we assume the document is finished.
121                                         $this->iCurrentPosition = $this->iLength;
122                                         return;
123                                 }
124                         } else {
125                                 $oComment = $this->consumeComment();
126                         }
127                         if ($oComment !== false) {
128                                 $comments[] = $oComment;
129                         }
130                 } while($oComment !== false);
131                 return $comments;
132         }
134         public function comes($sString, $bCaseInsensitive = false) {
135                 $sPeek = $this->peek(strlen($sString));
136                 return ($sPeek == '')
137                         ? false
138                         : $this->streql($sPeek, $sString, $bCaseInsensitive);
139         }
141         public function peek($iLength = 1, $iOffset = 0) {
142                 $iOffset += $this->iCurrentPosition;
143                 if ($iOffset >= $this->iLength) {
144                         return '';
145                 }
146                 return $this->substr($iOffset, $iLength);
147         }
149         public function consume($mValue = 1) {
150                 if (is_string($mValue)) {
151                         $iLineCount = substr_count($mValue, "\n");
152                         $iLength = $this->strlen($mValue);
153                         if (!$this->streql($this->substr($this->iCurrentPosition, $iLength), $mValue)) {
154                                 throw new UnexpectedTokenException($mValue, $this->peek(max($iLength, 5)), $this->iLineNo);
155                         }
156                         $this->iLineNo += $iLineCount;
157                         $this->iCurrentPosition += $this->strlen($mValue);
158                         return $mValue;
159                 } else {
160                         if ($this->iCurrentPosition + $mValue > $this->iLength) {
161                                 throw new UnexpectedTokenException($mValue, $this->peek(5), 'count', $this->iLineNo);
162                         }
163                         $sResult = $this->substr($this->iCurrentPosition, $mValue);
164                         $iLineCount = substr_count($sResult, "\n");
165                         $this->iLineNo += $iLineCount;
166                         $this->iCurrentPosition += $mValue;
167                         return $sResult;
168                 }
169         }
171         public function consumeExpression($mExpression, $iMaxLength = null) {
172                 $aMatches = null;
173                 $sInput = $iMaxLength !== null ? $this->peek($iMaxLength) : $this->inputLeft();
174                 if (preg_match($mExpression, $sInput, $aMatches, PREG_OFFSET_CAPTURE) === 1) {
175                         return $this->consume($aMatches[0][0]);
176                 }
177                 throw new UnexpectedTokenException($mExpression, $this->peek(5), 'expression', $this->iLineNo);
178         }
180         /**
181          * @return false|Comment
182          */
183         public function consumeComment() {
184                 $mComment = false;
185                 if ($this->comes('/*')) {
186                         $iLineNo = $this->iLineNo;
187                         $this->consume(1);
188                         $mComment = '';
189                         while (($char = $this->consume(1)) !== '') {
190                                 $mComment .= $char;
191                                 if ($this->comes('*/')) {
192                                         $this->consume(2);
193                                         break;
194                                 }
195                         }
196                 }
198                 if ($mComment !== false) {
199                         // We skip the * which was included in the comment.
200                         return new Comment(substr($mComment, 1), $iLineNo);
201                 }
203                 return $mComment;
204         }
206         public function isEnd() {
207                 return $this->iCurrentPosition >= $this->iLength;
208         }
210         public function consumeUntil($aEnd, $bIncludeEnd = false, $consumeEnd = false, array &$comments = array()) {
211                 $aEnd = is_array($aEnd) ? $aEnd : array($aEnd);
212                 $out = '';
213                 $start = $this->iCurrentPosition;
215                 while (($char = $this->consume(1)) !== '') {
216                         if (in_array($char, $aEnd)) {
217                                 if ($bIncludeEnd) {
218                                         $out .= $char;
219                                 } elseif (!$consumeEnd) {
220                                         $this->iCurrentPosition -= $this->strlen($char);
221                                 }
222                                 return $out;
223                         }
224                         $out .= $char;
225                         if ($comment = $this->consumeComment()) {
226                                 $comments[] = $comment;
227                         }
228                 }
230                 $this->iCurrentPosition = $start;
231                 throw new UnexpectedTokenException('One of ("'.implode('","', $aEnd).'")', $this->peek(5), 'search', $this->iLineNo);
232         }
234         private function inputLeft() {
235                 return $this->substr($this->iCurrentPosition, -1);
236         }
238         public function streql($sString1, $sString2, $bCaseInsensitive = true) {
239                 if($bCaseInsensitive) {
240                         return $this->strtolower($sString1) === $this->strtolower($sString2);
241                 } else {
242                         return $sString1 === $sString2;
243                 }
244         }
246         public function backtrack($iAmount) {
247                 $this->iCurrentPosition -= $iAmount;
248         }
250         public function strlen($sString) {
251                 if ($this->oParserSettings->bMultibyteSupport) {
252                         return mb_strlen($sString, $this->sCharset);
253                 } else {
254                         return strlen($sString);
255                 }       
256         }       
258         private function substr($iStart, $iLength) {
259                 if ($iLength < 0) {
260                         $iLength = $this->iLength - $iStart + $iLength;
261                 }       
262                 if ($iStart + $iLength > $this->iLength) {
263                         $iLength = $this->iLength - $iStart;
264                 }       
265                 $sResult = '';
266                 while ($iLength > 0) {
267                         $sResult .= $this->aText[$iStart];
268                         $iStart++;
269                         $iLength--;
270                 }       
271                 return $sResult;
272         }
274         private function strtolower($sString) {
275                 if ($this->oParserSettings->bMultibyteSupport) {
276                         return mb_strtolower($sString, $this->sCharset);
277                 } else {
278                         return strtolower($sString);
279                 }
280         }
282         private function strsplit($sString) {
283                 if ($this->oParserSettings->bMultibyteSupport) {
284                         if ($this->streql($this->sCharset, 'utf-8')) {
285                                 return preg_split('//u', $sString, null, PREG_SPLIT_NO_EMPTY);
286                         } else {
287                                 $iLength = mb_strlen($sString, $this->sCharset);
288                                 $aResult = array();
289                                 for ($i = 0; $i < $iLength; ++$i) {
290                                         $aResult[] = mb_substr($sString, $i, 1, $this->sCharset);
291                                 }
292                                 return $aResult;
293                         }
294                 } else {
295                         if($sString === '') {
296                                 return array();
297                         } else {
298                                 return str_split($sString);
299                         }
300                 }
301         }
303         private function strpos($sString, $sNeedle, $iOffset) {
304                 if ($this->oParserSettings->bMultibyteSupport) {
305                         return mb_strpos($sString, $sNeedle, $iOffset, $this->sCharset);
306                 } else {
307                         return strpos($sString, $sNeedle, $iOffset);
308                 }
309         }