<?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\Translation;

use Symfony\Contracts\Translation\TranslatorInterface;

/**
 * This translator should only be used in a development environment.
 */
final class PseudoLocalizationTranslator implements TranslatorInterface
{
    private const EXPANSION_CHARACTER = '~';

    private $translator;
    private bool $accents;
    private float $expansionFactor;
    private bool $brackets;
    private bool $parseHTML;

    /**
     * @var string[]
     */
    private array $localizableHTMLAttributes;

    /**
     * Available options:
     *  * accents:
     *      type: boolean
     *      default: true
     *      description: replace ASCII characters of the translated string with accented versions or similar characters
     *      example: if true, "foo" => "ƒöö".
     *
     *  * expansion_factor:
     *      type: float
     *      default: 1
     *      validation: it must be greater than or equal to 1
     *      description: expand the translated string by the given factor with spaces and tildes
     *      example: if 2, "foo" => "~foo ~"
     *
     *  * brackets:
     *      type: boolean
     *      default: true
     *      description: wrap the translated string with brackets
     *      example: if true, "foo" => "[foo]"
     *
     *  * parse_html:
     *      type: boolean
     *      default: false
     *      description: parse the translated string as HTML - looking for HTML tags has a performance impact but allows to preserve them from alterations - it also allows to compute the visible translated string length which is useful to correctly expand ot when it contains HTML
     *      warning: unclosed tags are unsupported, they will be fixed (closed) by the parser - eg, "foo <div>bar" => "foo <div>bar</div>"
     *
     *  * localizable_html_attributes:
     *      type: string[]
     *      default: []
     *      description: the list of HTML attributes whose values can be altered - it is only useful when the "parse_html" option is set to true
     *      example: if ["title"], and with the "accents" option set to true, "<a href="#" title="Go to your profile">Profile</a>" => "<a href="#" title="Ĝö ţö ýöûŕ þŕöƒîļé">Þŕöƒîļé</a>" - if "title" was not in the "localizable_html_attributes" list, the title attribute data would be left unchanged.
     */
    public function __construct(TranslatorInterface $translator, array $options = [])
    {
        $this->translator = $translator;
        $this->accents = $options['accents'] ?? true;

        if (1.0 > ($this->expansionFactor = $options['expansion_factor'] ?? 1.0)) {
            throw new \InvalidArgumentException('The expansion factor must be greater than or equal to 1.');
        }

        $this->brackets = $options['brackets'] ?? true;

        $this->parseHTML = $options['parse_html'] ?? false;
        if ($this->parseHTML && !$this->accents && 1.0 === $this->expansionFactor) {
            $this->parseHTML = false;
        }

        $this->localizableHTMLAttributes = $options['localizable_html_attributes'] ?? [];
    }

    /**
     * {@inheritdoc}
     */
    public function trans(string $id, array $parameters = [], string $domain = null, string $locale = null): string
    {
        $trans = '';
        $visibleText = '';

        foreach ($this->getParts($this->translator->trans($id, $parameters, $domain, $locale)) as [$visible, $localizable, $text]) {
            if ($visible) {
                $visibleText .= $text;
            }

            if (!$localizable) {
                $trans .= $text;

                continue;
            }

            $this->addAccents($trans, $text);
        }

        $this->expand($trans, $visibleText);

        $this->addBrackets($trans);

        return $trans;
    }

    public function getLocale(): string
    {
        return $this->translator->getLocale();
    }

    private function getParts(string $originalTrans): array
    {
        if (!$this->parseHTML) {
            return [[true, true, $originalTrans]];
        }

        $html = mb_encode_numericentity($originalTrans, [0x80, 0xFFFF, 0, 0xFFFF], mb_detect_encoding($originalTrans, null, true) ?: 'UTF-8');

        $useInternalErrors = libxml_use_internal_errors(true);

        $dom = new \DOMDocument();
        $dom->loadHTML('<trans>'.$html.'</trans>');

        libxml_clear_errors();
        libxml_use_internal_errors($useInternalErrors);

        return $this->parseNode($dom->childNodes->item(1)->childNodes->item(0)->childNodes->item(0));
    }

    private function parseNode(\DOMNode $node): array
    {
        $parts = [];

        foreach ($node->childNodes as $childNode) {
            if (!$childNode instanceof \DOMElement) {
                $parts[] = [true, true, $childNode->nodeValue];

                continue;
            }

            $parts[] = [false, false, '<'.$childNode->tagName];

            /** @var \DOMAttr $attribute */
            foreach ($childNode->attributes as $attribute) {
                $parts[] = [false, false, ' '.$attribute->nodeName.'="'];

                $localizableAttribute = \in_array($attribute->nodeName, $this->localizableHTMLAttributes, true);
                foreach (preg_split('/(&(?:amp|quot|#039|lt|gt);+)/', htmlspecialchars($attribute->nodeValue, \ENT_QUOTES, 'UTF-8'), -1, \PREG_SPLIT_DELIM_CAPTURE) as $i => $match) {
                    if ('' === $match) {
                        continue;
                    }

                    $parts[] = [false, $localizableAttribute && 0 === $i % 2, $match];
                }

                $parts[] = [false, false, '"'];
            }

            $parts[] = [false, false, '>'];

            $parts = array_merge($parts, $this->parseNode($childNode, $parts));

            $parts[] = [false, false, '</'.$childNode->tagName.'>'];
        }

        return $parts;
    }

    private function addAccents(string &$trans, string $text): void
    {
        $trans .= $this->accents ? strtr($text, [
            ' ' => ' ',
            '!' => '¡',
            '"' => '″',
            '#' => '♯',
            '$' => '€',
            '%' => '‰',
            '&' => '⅋',
            '\'' => '´',
            '(' => '{',
            ')' => '}',
            '*' => '⁎',
            '+' => '⁺',
            ',' => '،',
            '-' => '‐',
            '.' => '·',
            '/' => '⁄',
            '0' => '⓪',
            '1' => '①',
            '2' => '②',
            '3' => '③',
            '4' => '④',
            '5' => '⑤',
            '6' => '⑥',
            '7' => '⑦',
            '8' => '⑧',
            '9' => '⑨',
            ':' => '∶',
            ';' => '⁏',
            '<' => '≤',
            '=' => '≂',
            '>' => '≥',
            '?' => '¿',
            '@' => '՞',
            'A' => 'Å',
            'B' => 'Ɓ',
            'C' => 'Ç',
            'D' => 'Ð',
            'E' => 'É',
            'F' => 'Ƒ',
            'G' => 'Ĝ',
            'H' => 'Ĥ',
            'I' => 'Î',
            'J' => 'Ĵ',
            'K' => 'Ķ',
            'L' => 'Ļ',
            'M' => 'Ṁ',
            'N' => 'Ñ',
            'O' => 'Ö',
            'P' => 'Þ',
            'Q' => 'Ǫ',
            'R' => 'Ŕ',
            'S' => 'Š',
            'T' => 'Ţ',
            'U' => 'Û',
            'V' => 'Ṽ',
            'W' => 'Ŵ',
            'X' => 'Ẋ',
            'Y' => 'Ý',
            'Z' => 'Ž',
            '[' => '⁅',
            '\\' => '∖',
            ']' => '⁆',
            '^' => '˄',
            '_' => '‿',
            '`' => '‵',
            'a' => 'å',
            'b' => 'ƀ',
            'c' => 'ç',
            'd' => 'ð',
            'e' => 'é',
            'f' => 'ƒ',
            'g' => 'ĝ',
            'h' => 'ĥ',
            'i' => 'î',
            'j' => 'ĵ',
            'k' => 'ķ',
            'l' => 'ļ',
            'm' => 'ɱ',
            'n' => 'ñ',
            'o' => 'ö',
            'p' => 'þ',
            'q' => 'ǫ',
            'r' => 'ŕ',
            's' => 'š',
            't' => 'ţ',
            'u' => 'û',
            'v' => 'ṽ',
            'w' => 'ŵ',
            'x' => 'ẋ',
            'y' => 'ý',
            'z' => 'ž',
            '{' => '(',
            '|' => '¦',
            '}' => ')',
            '~' => '˞',
        ]) : $text;
    }

    private function expand(string &$trans, string $visibleText): void
    {
        if (1.0 >= $this->expansionFactor) {
            return;
        }

        $visibleLength = $this->strlen($visibleText);
        $missingLength = (int) ceil($visibleLength * $this->expansionFactor) - $visibleLength;
        if ($this->brackets) {
            $missingLength -= 2;
        }

        if (0 >= $missingLength) {
            return;
        }

        $words = [];
        $wordsCount = 0;
        foreach (preg_split('/ +/', $visibleText, -1, \PREG_SPLIT_NO_EMPTY) as $word) {
            $wordLength = $this->strlen($word);

            if ($wordLength >= $missingLength) {
                continue;
            }

            if (!isset($words[$wordLength])) {
                $words[$wordLength] = 0;
            }

            ++$words[$wordLength];
            ++$wordsCount;
        }

        if (!$words) {
            $trans .= 1 === $missingLength ? self::EXPANSION_CHARACTER : ' '.str_repeat(self::EXPANSION_CHARACTER, $missingLength - 1);

            return;
        }

        arsort($words, \SORT_NUMERIC);

        $longestWordLength = max(array_keys($words));

        while (true) {
            $r = mt_rand(1, $wordsCount);

            foreach ($words as $length => $count) {
                $r -= $count;
                if ($r <= 0) {
                    break;
                }
            }

            $trans .= ' '.str_repeat(self::EXPANSION_CHARACTER, $length);

            $missingLength -= $length + 1;

            if (0 === $missingLength) {
                return;
            }

            while ($longestWordLength >= $missingLength) {
                $wordsCount -= $words[$longestWordLength];
                unset($words[$longestWordLength]);

                if (!$words) {
                    $trans .= 1 === $missingLength ? self::EXPANSION_CHARACTER : ' '.str_repeat(self::EXPANSION_CHARACTER, $missingLength - 1);

                    return;
                }

                $longestWordLength = max(array_keys($words));
            }
        }
    }

    private function addBrackets(string &$trans): void
    {
        if (!$this->brackets) {
            return;
        }

        $trans = '['.$trans.']';
    }

    private function strlen(string $s): int
    {
        return false === ($encoding = mb_detect_encoding($s, null, true)) ? \strlen($s) : mb_strlen($s, $encoding);
    }
}

• [D] Catalogue
• [D] Command
• [D] DataCollector
• [D] DependencyInjection
• [D] Dumper
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• [F] CHANGELOG.md
  Delete
• [F] composer.json
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• [F] DataCollectorTranslator.php
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• [F] IdentityTranslator.php
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• [F] LICENSE
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• [F] LoggingTranslator.php
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• [F] MessageCatalogue.php
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• [F] MessageCatalogueInterface.php
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• [F] MetadataAwareInterface.php
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• [F] PseudoLocalizationTranslator.php
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• [F] README.md
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• [F] TranslatableMessage.php
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• [F] Translator.php
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• [F] TranslatorBag.php
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• [F] TranslatorBagInterface.php
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