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<?php
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namespace Sabberworm\CSS\Value;
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use Sabberworm\CSS\Parsing\ParserState;
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use Sabberworm\CSS\Parsing\UnexpectedEOFException;
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use Sabberworm\CSS\Parsing\UnexpectedTokenException;
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class CalcFunction extends CSSFunction
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{
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/**
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* @var int
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*/
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const T_OPERAND = 1;
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/**
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* @var int
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*/
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const T_OPERATOR = 2;
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/**
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* @return CalcFunction
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*
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* @throws UnexpectedTokenException
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* @throws UnexpectedEOFException
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*/
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public static function parse(ParserState $oParserState)
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{
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$aOperators = ['+', '-', '*', '/'];
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$sFunction = trim($oParserState->consumeUntil('(', false, true));
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$oCalcList = new CalcRuleValueList($oParserState->currentLine());
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$oList = new RuleValueList(',', $oParserState->currentLine());
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$iNestingLevel = 0;
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$iLastComponentType = null;
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while (!$oParserState->comes(')') || $iNestingLevel > 0) {
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$oParserState->consumeWhiteSpace();
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if ($oParserState->comes('(')) {
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$iNestingLevel++;
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$oCalcList->addListComponent($oParserState->consume(1));
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$oParserState->consumeWhiteSpace();
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continue;
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} elseif ($oParserState->comes(')')) {
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$iNestingLevel--;
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$oCalcList->addListComponent($oParserState->consume(1));
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$oParserState->consumeWhiteSpace();
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continue;
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}
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if ($iLastComponentType != CalcFunction::T_OPERAND) {
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$oVal = Value::parsePrimitiveValue($oParserState);
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$oCalcList->addListComponent($oVal);
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$iLastComponentType = CalcFunction::T_OPERAND;
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} else {
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if (in_array($oParserState->peek(), $aOperators)) {
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if (($oParserState->comes('-') || $oParserState->comes('+'))) {
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if (
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$oParserState->peek(1, -1) != ' '
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|| !($oParserState->comes('- ')
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|| $oParserState->comes('+ '))
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) {
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throw new UnexpectedTokenException(
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" {$oParserState->peek()} ",
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$oParserState->peek(1, -1) . $oParserState->peek(2),
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'literal',
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$oParserState->currentLine()
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);
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}
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}
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$oCalcList->addListComponent($oParserState->consume(1));
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$iLastComponentType = CalcFunction::T_OPERATOR;
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} else {
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throw new UnexpectedTokenException(
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sprintf(
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'Next token was expected to be an operand of type %s. Instead "%s" was found.',
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implode(', ', $aOperators),
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$oVal
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),
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'',
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'custom',
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$oParserState->currentLine()
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);
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}
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}
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$oParserState->consumeWhiteSpace();
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}
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$oList->addListComponent($oCalcList);
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$oParserState->consume(')');
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return new CalcFunction($sFunction, $oList, ',', $oParserState->currentLine());
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}
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}
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