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/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\CssSelector\Parser\Tokenizer;

/**
 * CSS selector tokenizer patterns builder.
 *
 * This component is a port of the Python cssselect library,
 * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
 *
 * @author Jean-François Simon &lt;jeanfrancois.simon@sensiolabs.com&gt;
 *
 * @internal
 */
class TokenizerPatterns
{
    private $unicodeEscapePattern;
    private $simpleEscapePattern;
    private $newLineEscapePattern;
    private $escapePattern;
    private $stringEscapePattern;
    private $nonAsciiPattern;
    private $nmCharPattern;
    private $nmStartPattern;
    private $identifierPattern;
    private $hashPattern;
    private $numberPattern;
    private $quotedStringPattern;

    public function __construct()
    {
        $this-&gt;unicodeEscapePattern = '\\\\([0-9a-f]{1,6})(?:\r\n|[ \n\r\t\f])?';
        $this-&gt;simpleEscapePattern = '\\\\(.)';
        $this-&gt;newLineEscapePattern = '\\\\(?:\n|\r\n|\r|\f)';
        $this-&gt;escapePattern = $this-&gt;unicodeEscapePattern.'|\\\\[^\n\r\f0-9a-f]';
        $this-&gt;stringEscapePattern = $this-&gt;newLineEscapePattern.'|'.$this-&gt;escapePattern;
        $this-&gt;nonAsciiPattern = '[^\x00-\x7F]';
        $this-&gt;nmCharPattern = '[_a-z0-9-]|'.$this-&gt;escapePattern.'|'.$this-&gt;nonAsciiPattern;
        $this-&gt;nmStartPattern = '[_a-z]|'.$this-&gt;escapePattern.'|'.$this-&gt;nonAsciiPattern;
        $this-&gt;identifierPattern = '-?(?:'.$this-&gt;nmStartPattern.')(?:'.$this-&gt;nmCharPattern.')*';
        $this-&gt;hashPattern = '#((?:'.$this-&gt;nmCharPattern.')+)';
        $this-&gt;numberPattern = '[+-]?(?:[0-9]*\.[0-9]+|[0-9]+)';
        $this-&gt;quotedStringPattern = '([^\n\r\f\\\\%s]|'.$this-&gt;stringEscapePattern.')*';
    }

    public function getNewLineEscapePattern(): string
    {
        return '~'.$this-&gt;newLineEscapePattern.'~';
    }

    public function getSimpleEscapePattern(): string
    {
        return '~'.$this-&gt;simpleEscapePattern.'~';
    }

    public function getUnicodeEscapePattern(): string
    {
        return '~'.$this-&gt;unicodeEscapePattern.'~i';
    }

    public function getIdentifierPattern(): string
    {
        return '~^'.$this-&gt;identifierPattern.'~i';
    }

    public function getHashPattern(): string
    {
        return '~^'.$this-&gt;hashPattern.'~i';
    }

    public function getNumberPattern(): string
    {
        return '~^'.$this-&gt;numberPattern.'~';
    }

    public function getQuotedStringPattern(string $quote): string
    {
        return '~^'.sprintf($this-&gt;quotedStringPattern, $quote).'~i';
    }
}
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