<?php

/**
 * This file is part of the Nette Framework (https://nette.org)
 * Copyright (c) 2004 David Grudl (https://davidgrudl.com)
 */
declare (strict_types=1);
namespace Packetery\Nette\Neon\Node;

use Packetery\Nette;
use Packetery\Nette\Neon\Node;
/** @internal */
final class StringNode extends Node
{
    private const EscapeSequences = ['t' => "\t", 'n' => "\n", 'r' => "\r", 'f' => "\f", 'b' => "\x08", '"' => '"', '\\' => '\\', '/' => '/', '_' => " "];
    /** @var string */
    public $value;
    public function __construct(string $value)
    {
        $this->value = $value;
    }
    public function toValue() : string
    {
        return $this->value;
    }
    public static function parse(string $s) : string
    {
        if (\preg_match('#^...\\n++([\\t ]*+)#', $s, $m)) {
            // multiline
            $res = \substr($s, 3, -3);
            $res = \str_replace("\n" . $m[1], "\n", $res);
            $res = \preg_replace('#^\\n|\\n[\\t ]*+$#D', '', $res);
        } else {
            $res = \substr($s, 1, -1);
            if ($s[0] === "'") {
                $res = \str_replace("''", "'", $res);
            }
        }
        if ($s[0] === "'") {
            return $res;
        }
        return \preg_replace_callback('#\\\\(?:ud[89ab][0-9a-f]{2}\\\\ud[c-f][0-9a-f]{2}|u[0-9a-f]{4}|x[0-9a-f]{2}|.)#i', function (array $m) : string {
            $sq = $m[0];
            if (isset(self::EscapeSequences[$sq[1]])) {
                return self::EscapeSequences[$sq[1]];
            } elseif ($sq[1] === 'u' && \strlen($sq) >= 6) {
                if (($res = \json_decode('"' . $sq . '"')) !== null) {
                    return $res;
                }
                throw new \Packetery\Nette\Neon\Exception("Invalid UTF-8 sequence {$sq}");
            } elseif ($sq[1] === 'x' && \strlen($sq) === 4) {
                \trigger_error("Neon: '{$sq}' is deprecated, use '\\uXXXX' instead.", \E_USER_DEPRECATED);
                return \chr(\hexdec(\substr($sq, 2)));
            } else {
                throw new \Packetery\Nette\Neon\Exception("Invalid escaping sequence {$sq}");
            }
        }, $res);
    }
    public function toString() : string
    {
        if (\strpos($this->value, "\n") === \false) {
            return "'" . \str_replace("'", "''", $this->value) . "'";
        } elseif (\preg_match('~\\n[\\t ]+\'{3}~', $this->value)) {
            $s = \json_encode($this->value, \JSON_UNESCAPED_UNICODE | \JSON_UNESCAPED_SLASHES);
            $s = \preg_replace_callback('#[^\\\\]|\\\\(.)#s', function ($m) {
                return ['n' => "\n", 't' => "\t", '"' => '"'][$m[1] ?? ''] ?? $m[0];
            }, \substr($s, 1, -1));
            $s = \str_replace('"""', '""\\"', $s);
            $delim = '"""';
        } else {
            $s = $this->value;
            $delim = "'''";
        }
        $s = \preg_replace('#^(?=.)#m', "\t", $s);
        return $delim . "\n" . $s . "\n" . $delim;
    }
}
