path: root/srcs/phpmyadmin/vendor/symfony/yaml/Parser.php

<?php

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

namespace Symfony\Component\Yaml;

use Symfony\Component\Yaml\Exception\ParseException;
use Symfony\Component\Yaml\Tag\TaggedValue;

/**
 * Parser parses YAML strings to convert them to PHP arrays.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 *
 * @final
 */
class Parser
{
    const TAG_PATTERN = '(?P<tag>![\w!.\/:-]+)';
    const BLOCK_SCALAR_HEADER_PATTERN = '(?P<separator>\||>)(?P<modifiers>\+|\-|\d+|\+\d+|\-\d+|\d+\+|\d+\-)?(?P<comments> +#.*)?';

    private $filename;
    private $offset = 0;
    private $totalNumberOfLines;
    private $lines = [];
    private $currentLineNb = -1;
    private $currentLine = '';
    private $refs = [];
    private $skippedLineNumbers = [];
    private $locallySkippedLineNumbers = [];
    private $refsBeingParsed = [];

    /**
     * Parses a YAML file into a PHP value.
     *
     * @param string $filename The path to the YAML file to be parsed
     * @param int    $flags    A bit field of PARSE_* constants to customize the YAML parser behavior
     *
     * @return mixed The YAML converted to a PHP value
     *
     * @throws ParseException If the file could not be read or the YAML is not valid
     */
    public function parseFile(string $filename, int $flags = 0)
    {
        if (!is_file($filename)) {
            throw new ParseException(sprintf('File "%s" does not exist.', $filename));
        }

        if (!is_readable($filename)) {
            throw new ParseException(sprintf('File "%s" cannot be read.', $filename));
        }

        $this->filename = $filename;

        try {
            return $this->parse(file_get_contents($filename), $flags);
        } finally {
            $this->filename = null;
        }
    }

    /**
     * Parses a YAML string to a PHP value.
     *
     * @param string $value A YAML string
     * @param int    $flags A bit field of PARSE_* constants to customize the YAML parser behavior
     *
     * @return mixed A PHP value
     *
     * @throws ParseException If the YAML is not valid
     */
    public function parse(string $value, int $flags = 0)
    {
        if (false === preg_match('//u', $value)) {
            throw new ParseException('The YAML value does not appear to be valid UTF-8.', -1, null, $this->filename);
        }

        $this->refs = [];

        $mbEncoding = null;

        if (2 /* MB_OVERLOAD_STRING */ & (int) ini_get('mbstring.func_overload')) {
            $mbEncoding = mb_internal_encoding();
            mb_internal_encoding('UTF-8');
        }

        try {
            $data = $this->doParse($value, $flags);
        } finally {
            if (null !== $mbEncoding) {
                mb_internal_encoding($mbEncoding);
            }
            $this->lines = [];
            $this->currentLine = '';
            $this->refs = [];
            $this->skippedLineNumbers = [];
            $this->locallySkippedLineNumbers = [];
        }

        return $data;
    }

    private function doParse(string $value, int $flags)
    {
        $this->currentLineNb = -1;
        $this->currentLine = '';
        $value = $this->cleanup($value);
        $this->lines = explode("\n", $value);
        $this->locallySkippedLineNumbers = [];

        if (null === $this->totalNumberOfLines) {
            $this->totalNumberOfLines = \count($this->lines);
        }

        if (!$this->moveToNextLine()) {
            return null;
        }

        $data = [];
        $context = null;
        $allowOverwrite = false;

        while ($this->isCurrentLineEmpty()) {
            if (!$this->moveToNextLine()) {
                return null;
            }
        }

        // Resolves the tag and returns if end of the document
        if (null !== ($tag = $this->getLineTag($this->currentLine, $flags, false)) && !$this->moveToNextLine()) {
            return new TaggedValue($tag, '');