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Editing: JsonFormatter.php

<?php declare(strict_types=1);

/*
 * This file is part of Composer.
 *
 * (c) Nils Adermann <naderman@naderman.de>
 *     Jordi Boggiano <j.boggiano@seld.be>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Composer\Json;

use Composer\Pcre\Preg;

/**
 * Formats json strings used for php < 5.4 because the json_encode doesn't
 * supports the flags JSON_UNESCAPED_SLASHES | JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE
 * in these versions
 *
 * @author Konstantin Kudryashiv <ever.zet@gmail.com>
 * @author Jordi Boggiano <j.boggiano@seld.be>
 *
 * @deprecated Use json_encode or JsonFile::encode() with modern JSON_* flags to configure formatting - this class will be removed in 3.0
 */
class JsonFormatter
{
    /**
     * This code is based on the function found at:
     *  http://recursive-design.com/blog/2008/03/11/format-json-with-php/
     *
     * Originally licensed under MIT by Dave Perrett <mail@recursive-design.com>
     *
     * @param  bool   $unescapeUnicode Un escape unicode
     * @param  bool   $unescapeSlashes Un escape slashes
     */
    public static function format(string $json, bool $unescapeUnicode, bool $unescapeSlashes): string
    {
        $result = '';
        $pos = 0;
        $strLen = strlen($json);
        $indentStr = '    ';
        $newLine = "\n";
        $outOfQuotes = true;
        $buffer = '';
        $noescape = true;

for ($i = 0; $i < $strLen; $i++) {
            // Grab the next character in the string
            $char = substr($json, $i, 1);

// Are we inside a quoted string?
            if ('"' === $char && $noescape) {
                $outOfQuotes = !$outOfQuotes;
            }

if (!$outOfQuotes) {
                $buffer .= $char;
                $noescape = '\\' === $char ? !$noescape : true;
                continue;
            }
            if ('' !== $buffer) {
                if ($unescapeSlashes) {
                    $buffer = str_replace('\\/', '/', $buffer);
                }

if ($unescapeUnicode && function_exists('mb_convert_encoding')) {
                    // https://stackoverflow.com/questions/2934563/how-to-decode-unicode-escape-sequences-like-u00ed-to-proper-utf-8-encoded-cha
                    $buffer = Preg::replaceCallback('/(\\\\+)u([0-9a-f]{4})/i', static function ($match): string {
                        $l = strlen($match[1]);

if ($l % 2) {
                            $code = hexdec($match[2]);
                            // 0xD800..0xDFFF denotes UTF-16 surrogate pair which won't be unescaped
                            // see https://github.com/composer/composer/issues/7510
                            if (0xD800 <= $code && 0xDFFF >= $code) {
                                return $match[0];
                            }

return str_repeat('\\', $l - 1) . mb_convert_encoding(
                                pack('H*', $match[2]),
                                'UTF-8',
                                'UCS-2BE'
                            );
                        }

return $match[0];
                    }, $buffer);
                }

$result .= $buffer.$char;
                $buffer = '';
                continue;
            }

if (':' === $char) {
                // Add a space after the : character
                $char .= ' ';
            } elseif ('}' === $char || ']' === $char) {
                $pos--;
                $prevChar = substr($json, $i - 1, 1);

if ('{' !== $prevChar && '[' !== $prevChar) {
                    // If this character is the end of an element,
                    // output a new line and indent the next line
                    $result .= $newLine;
                    $result .= str_repeat($indentStr, $pos);
                } else {
                    // Collapse empty {} and []
                    $result = rtrim($result);
                }
            }

$result .= $char;

// If the last character was the beginning of an element,
            // output a new line and indent the next line
            if (',' === $char || '{' === $char || '[' === $char) {
                $result .= $newLine;

if ('{' === $char || '[' === $char) {
                    $pos++;
                }

$result .= str_repeat($indentStr, $pos);
            }
        }

return $result;
    }
}

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