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<?php |
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|
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namespace Sabberworm\CSS\Value; |
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|
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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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|
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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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/** |
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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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/** |
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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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|
