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   1  <?php
   2  namespace Sabberworm\CSS\Parsing;
   3  
   4  use Sabberworm\CSS\Comment\Comment;
   5  use Sabberworm\CSS\Parsing\UnexpectedTokenException;
   6  use Sabberworm\CSS\Settings;
   7  
   8  class ParserState {
   9      private $oParserSettings;
  10  
  11      private $sText;
  12  
  13      private $aText;
  14      private $iCurrentPosition;
  15      private $sCharset;
  16      private $iLength;
  17      private $iLineNo;
  18  
  19  	public function __construct($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      }
  26  
  27  	public function setCharset($sCharset) {
  28          $this->sCharset = $sCharset;
  29          $this->aText = $this->strsplit($this->sText);
  30          $this->iLength = count($this->aText);
  31      }
  32  
  33  	public function getCharset() {
  34          $this->oParserHelper->getCharset();
  35          return $this->sCharset;
  36      }
  37  
  38  	public function currentLine() {
  39          return $this->iLineNo;
  40      }
  41  
  42  	public function getSettings() {
  43          return $this->oParserSettings;
  44      }
  45  
  46  	public function parseIdentifier($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 $sResult;
  59      }
  60  
  61  	public function parseCharacter($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      }
 109  
 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 $comments;
 132      }
 133  
 134  	public function comes($sString, $bCaseInsensitive = false) {
 135          $sPeek = $this->peek(strlen($sString));
 136          return ($sPeek == '')
 137              ? false
 138              : $this->streql($sPeek, $sString, $bCaseInsensitive);
 139      }
 140  
 141  	public function peek($iLength = 1, $iOffset = 0) {
 142          $iOffset += $this->iCurrentPosition;
 143          if ($iOffset >= $this->iLength) {
 144              return '';
 145          }
 146          return $this->substr($iOffset, $iLength);
 147      }
 148  
 149  	public function consume($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 $sResult;
 168          }
 169      }
 170  
 171  	public function consumeExpression($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      }
 179  
 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                      $this->consume(2);
 193                      break;
 194                  }
 195              }
 196          }
 197  
 198          if ($mComment !== false) {
 199              // We skip the * which was included in the comment.
 200              return new Comment(substr($mComment, 1), $iLineNo);
 201          }
 202  
 203          return $mComment;
 204      }
 205  
 206  	public function isEnd() {
 207          return $this->iCurrentPosition >= $this->iLength;
 208      }
 209  
 210  	public function consumeUntil($aEnd, $bIncludeEnd = false, $consumeEnd = false, array &$comments = array()) {
 211          $aEnd = is_array($aEnd) ? $aEnd : array($aEnd);
 212          $out = '';
 213          $start = $this->iCurrentPosition;
 214  
 215          while (($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          }
 229  
 230          $this->iCurrentPosition = $start;
 231          throw new UnexpectedTokenException('One of ("'.implode('","', $aEnd).'")', $this->peek(5), 'search', $this->iLineNo);
 232      }
 233  
 234  	private function inputLeft() {
 235          return $this->substr($this->iCurrentPosition, -1);
 236      }
 237  
 238  	public function streql($sString1, $sString2, $bCaseInsensitive = true) {
 239          if($bCaseInsensitive) {
 240              return $this->strtolower($sString1) === $this->strtolower($sString2);
 241          } else {
 242              return $sString1 === $sString2;
 243          }
 244      }
 245  
 246  	public function backtrack($iAmount) {
 247          $this->iCurrentPosition -= $iAmount;
 248      }
 249  
 250  	public function strlen($sString) {
 251          if ($this->oParserSettings->bMultibyteSupport) {
 252              return mb_strlen($sString, $this->sCharset);
 253          } else {
 254              return strlen($sString);
 255          }    
 256      }    
 257  
 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 $sResult;
 272      }
 273  
 274  	private function strtolower($sString) {
 275          if ($this->oParserSettings->bMultibyteSupport) {
 276              return mb_strtolower($sString, $this->sCharset);
 277          } else {
 278              return strtolower($sString);
 279          }
 280      }
 281  
 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($sString);
 299              }
 300          }
 301      }
 302  
 303  	private function strpos($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      }
 310  }