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/usr/share/php/Sabberworm/CSS/Parsing/UnexpectedTokenException.php is in php-horde-css-parser 1.0.3-1.

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<?php

namespace Sabberworm\CSS\Parsing;

/**
* Thrown if the CSS parsers encounters a token it did not expect
*/
class UnexpectedTokenException extends \Exception {
    private $sExpected;
    private $sFound;
    // Possible values: literal, identifier, count, expression, search
    private $sMatchType;

    public function __construct($sExpected, $sFound, $sMatchType = 'literal') {
        $this->sExpected = $sExpected;
        $this->sFound = $sFound;
        $this->sMatchType = $sMatchType;
        $sMessage = "Token “{$sExpected}” ({$sMatchType}) not found. Got “{$sFound}”.";
        if($this->sMatchType === 'search') {
            $sMessage = "Search for “{$sExpected}” returned no results. Context: “{$sFound}”.";
        } else if($this->sMatchType === 'count') {
            $sMessage = "Next token was expected to have {$sExpected} chars. Context: “{$sFound}”.";
        } else if($this->sMatchType === 'identifier') {
            $sMessage = "Identifier expected. Got “{$sFound}”";
        }
        parent::__construct($sMessage);
    }
}