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1441 ariadna 1 
<?php
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namespace Sabberworm\CSS\Property;
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use Sabberworm\CSS\Comment\Comment;
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use Sabberworm\CSS\OutputFormat;
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use Sabberworm\CSS\Value\CSSString;
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/**
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 * Class representing an `@charset` rule.
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 *
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 * The following restrictions apply:
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 * - May not be found in any CSSList other than the Document.
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 * - May only appear at the very top of a Document’s contents.
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 * - Must not appear more than once.
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 */
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class Charset implements AtRule
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{
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    /**
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     * @var CSSString
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     */
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    private $oCharset;
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    /**
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     * @var int
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     */
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    protected $iLineNo;
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    /**
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     * @var array<array-key, Comment>
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     */
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    protected $aComments;
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    /**
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     * @param CSSString $oCharset
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     * @param int $iLineNo
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     */
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    public function __construct(CSSString $oCharset, $iLineNo = 0)
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    {
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        $this->oCharset = $oCharset;
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        $this->iLineNo = $iLineNo;
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        $this->aComments = [];
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    }
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    /**
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     * @return int
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     */
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    public function getLineNo()
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    {
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        return $this->iLineNo;
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    }
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    /**
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     * @param string|CSSString $oCharset
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     *
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     * @return void
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     */
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    public function setCharset($sCharset)
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    {
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        $sCharset = $sCharset instanceof CSSString ? $sCharset : new CSSString($sCharset);
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        $this->oCharset = $sCharset;
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    }
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    /**
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     * @return string
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     */
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    public function getCharset()
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    {
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        return $this->oCharset->getString();
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    }
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    /**
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     * @return string
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     */
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    public function __toString()
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    {
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        return $this->render(new OutputFormat());
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    }
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    /**
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     * @param OutputFormat|null $oOutputFormat
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     *
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     * @return string
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     */
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    public function render($oOutputFormat)
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    {
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        return "{$oOutputFormat->comments($this)}@charset {$this->oCharset->render($oOutputFormat)};";
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    }
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    /**
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     * @return string
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     */
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    public function atRuleName()
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    {
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        return 'charset';
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    }
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    /**
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     * @return string
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     */
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    public function atRuleArgs()
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    {
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        return $this->oCharset;
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    }
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    /**
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     * @param array<array-key, Comment> $aComments
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     *
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     * @return void
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     */
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    public function addComments(array $aComments)
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    {
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        $this->aComments = array_merge($this->aComments, $aComments);
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    }
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    /**
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     * @return array<array-key, Comment>
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     */
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    public function getComments()
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    {
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        return $this->aComments;
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    }
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    /**
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     * @param array<array-key, Comment> $aComments
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     *
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     * @return void
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     */
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    public function setComments(array $aComments)
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    {
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        $this->aComments = $aComments;
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    }
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}