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/usr/share/php/Horde/Css/Parser/vendor/sabberworm/php-css-parser/lib/Sabberworm/CSS/Value/CSSString.php is in php-horde-css-parser 1.0.11-1ubuntu1.

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<?php

namespace Sabberworm\CSS\Value;

class CSSString extends PrimitiveValue {

	private $sString;

	public function __construct($sString) {
		$this->sString = $sString;
	}

	public function setString($sString) {
		$this->sString = $sString;
	}

	public function getString() {
		return $this->sString;
	}

	public function __toString() {
		return $this->render(new \Sabberworm\CSS\OutputFormat());
	}

	public function render(\Sabberworm\CSS\OutputFormat $oOutputFormat) {
		$sString = addslashes($this->sString);
		$sString = str_replace("\n", '\A', $sString);
		return $oOutputFormat->getStringQuotingType() . $sString . $oOutputFormat->getStringQuotingType();
	}

}