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   1  <?php
   2  
   3  namespace Sabberworm\CSS\Value;
   4  
   5  use Sabberworm\CSS\Parsing\ParserState;
   6  use Sabberworm\CSS\Parsing\UnexpectedTokenException;
   7  
   8  class CalcFunction extends CSSFunction {
   9      const T_OPERAND  = 1;
  10      const T_OPERATOR = 2;
  11  
  12  	public static function parse(ParserState $oParserState) {
  13          $aOperators = array('+', '-', '*', '/');
  14          $sFunction = trim($oParserState->consumeUntil('(', false, true));
  15          $oCalcList = new CalcRuleValueList($oParserState->currentLine());
  16          $oList = new RuleValueList(',', $oParserState->currentLine());
  17          $iNestingLevel = 0;
  18          $iLastComponentType = NULL;
  19          while(!$oParserState->comes(')') || $iNestingLevel > 0) {
  20              $oParserState->consumeWhiteSpace();
  21              if ($oParserState->comes('(')) {
  22                  $iNestingLevel++;
  23                  $oCalcList->addListComponent($oParserState->consume(1));
  24                  continue;
  25              } else if ($oParserState->comes(')')) {
  26                  $iNestingLevel--;
  27                  $oCalcList->addListComponent($oParserState->consume(1));
  28                  continue;
  29              }
  30              if ($iLastComponentType != CalcFunction::T_OPERAND) {
  31                  $oVal = Value::parsePrimitiveValue($oParserState);
  32                  $oCalcList->addListComponent($oVal);
  33                  $iLastComponentType = CalcFunction::T_OPERAND;
  34              } else {
  35                  if (in_array($oParserState->peek(), $aOperators)) {
  36                      if (($oParserState->comes('-') || $oParserState->comes('+'))) {
  37                          if ($oParserState->peek(1, -1) != ' ' || !($oParserState->comes('- ') || $oParserState->comes('+ '))) {
  38                              throw new UnexpectedTokenException(" {$oParserState->peek()} ", $oParserState->peek(1, -1) . $oParserState->peek(2), 'literal', $oParserState->currentLine());
  39                          }
  40                      }
  41                      $oCalcList->addListComponent($oParserState->consume(1));
  42                      $iLastComponentType = CalcFunction::T_OPERATOR;
  43                  } else {
  44                      throw new UnexpectedTokenException(
  45                          sprintf(
  46                              'Next token was expected to be an operand of type %s. Instead "%s" was found.',
  47                              implode(', ', $aOperators),
  48                              $oVal
  49                          ),
  50                          '',
  51                          'custom',
  52                          $oParserState->currentLine()
  53                      );
  54                  }
  55              }
  56          }
  57          $oList->addListComponent($oCalcList);
  58          $oParserState->consume(')');
  59          return new CalcFunction($sFunction, $oList, ',', $oParserState->currentLine());
  60      }
  61  
  62  }