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Edit File: CalcFunction.php

<?php
namespace MailPoetVendor\Sabberworm\CSS\Value;
if (!defined('ABSPATH')) exit;
use MailPoetVendor\Sabberworm\CSS\Parsing\ParserState;
use MailPoetVendor\Sabberworm\CSS\Parsing\UnexpectedEOFException;
use MailPoetVendor\Sabberworm\CSS\Parsing\UnexpectedTokenException;
class CalcFunction extends CSSFunction
{
 const T_OPERAND = 1;
 const T_OPERATOR = 2;
 public static function parse(ParserState $oParserState, $bIgnoreCase = \false)
 {
 $aOperators = ['+', '-', '*', '/'];
 $sFunction = $oParserState->parseIdentifier();
 if ($oParserState->peek() != '(') {
 // Found ; or end of line before an opening bracket
 throw new UnexpectedTokenException('(', $oParserState->peek(), 'literal', $oParserState->currentLine());
 } elseif (!\in_array($sFunction, ['calc', '-moz-calc', '-webkit-calc'])) {
 // Found invalid calc definition. Example calc (...
 throw new UnexpectedTokenException('calc', $sFunction, 'literal', $oParserState->currentLine());
 }
 $oParserState->consume('(');
 $oCalcList = new CalcRuleValueList($oParserState->currentLine());
 $oList = new RuleValueList(',', $oParserState->currentLine());
 $iNestingLevel = 0;
 $iLastComponentType = null;
 while (!$oParserState->comes(')') || $iNestingLevel > 0) {
 if ($oParserState->isEnd() && $iNestingLevel === 0) {
 break;
 }
 $oParserState->consumeWhiteSpace();
 if ($oParserState->comes('(')) {
 $iNestingLevel++;
 $oCalcList->addListComponent($oParserState->consume(1));
 $oParserState->consumeWhiteSpace();
 continue;
 } elseif ($oParserState->comes(')')) {
 $iNestingLevel--;
 $oCalcList->addListComponent($oParserState->consume(1));
 $oParserState->consumeWhiteSpace();
 continue;
 }
 if ($iLastComponentType != CalcFunction::T_OPERAND) {
 $oVal = Value::parsePrimitiveValue($oParserState);
 $oCalcList->addListComponent($oVal);
 $iLastComponentType = CalcFunction::T_OPERAND;
 } else {
 if (\in_array($oParserState->peek(), $aOperators)) {
 if ($oParserState->comes('-') || $oParserState->comes('+')) {
 if ($oParserState->peek(1, -1) != ' ' || !($oParserState->comes('- ') || $oParserState->comes('+ '))) {
 throw new UnexpectedTokenException(" {$oParserState->peek()} ", $oParserState->peek(1, -1) . $oParserState->peek(2), 'literal', $oParserState->currentLine());
 }
 }
 $oCalcList->addListComponent($oParserState->consume(1));
 $iLastComponentType = CalcFunction::T_OPERATOR;
 } else {
 throw new UnexpectedTokenException(\sprintf('Next token was expected to be an operand of type %s. Instead "%s" was found.', \implode(', ', $aOperators), $oVal), '', 'custom', $oParserState->currentLine());
 }
 }
 $oParserState->consumeWhiteSpace();
 }
 $oList->addListComponent($oCalcList);
 if (!$oParserState->isEnd()) {
 $oParserState->consume(')');
 }
 return new CalcFunction($sFunction, $oList, ',', $oParserState->currentLine());
 }
}

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