<?php
namespace Sabberworm\CSS\Value;
use Sabberworm\CSS\Parsing\ParserState;
use Sabberworm\CSS\Parsing\UnexpectedEOFException;
use Sabberworm\CSS\Parsing\UnexpectedTokenException;
class CalcFunction extends CSSFunction
{
/**
* @var int
*/
const T_OPERAND = 1;
/**
* @var int
*/
const T_OPERATOR = 2;
/**
* @return CalcFunction
*
* @throws UnexpectedTokenException
* @throws UnexpectedEOFException
*/
public static function parse(ParserState $oParserState)
{
$aOperators = ['+', '-', '*', '/'];
$sFunction = trim($oParserState->consumeUntil('(', false, true));
$oCalcList = new CalcRuleValueList($oParserState->currentLine());
$oList = new RuleValueList(',', $oParserState->currentLine());
$iNestingLevel = 0;
$iLastComponentType = null;
while (!$oParserState->comes(')') || $iNestingLevel > 0) {
$oParserState->consumeWhiteSpace();
if ($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);
$oParserState->consume(')');
return new CalcFunction($sFunction, $oList, ',', $oParserState->currentLine());
}
}