lib/php-css-parser/Value/CalcFunction.php

   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 }