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<?php

namespace Gettext\Utils;

use Exception;
use Gettext\Translations;

abstract class FunctionsScanner
{
    /**
     * Scan and returns the functions and the arguments.
     *
     * @param array $constants Constants used in the code to replace
     *
     * @return array
     */
    abstract public function getFunctions(array $constants = []);

/**
     * Search for specific functions and create translations.
     *
     * You can pass multiple translation with different domains and value found will be sorted respectively.
     *
     * @param Translations|Translations[] $translations Multiple domain translations instances where to save the values
     * @param array $options The extractor options
     * @throws Exception
     */
    public function saveGettextFunctions($translations, array $options)
    {
        $translations = is_array($translations) ? $translations : [$translations];

/** @var Translations[] $translationByDomain [domain => translations, ..] */
        $translationByDomain = array_reduce($translations, function ($carry, Translations $translations) {
            $carry[$translations->getDomain()] = $translations;
            return $carry;
        }, []);

$functions = $options['functions'];
        $file = $options['file'];

/**
         * List of source code comments already associated with a function.
         *
         * Prevents associating the same comment to multiple functions.
         *
         * @var ParsedComment[] $commentsCache
         */
        $commentsCache = [];

foreach ($this->getFunctions($options['constants']) as $function) {
            list($name, $line, $args) = $function;

if (isset($options['lineOffset'])) {
                $line += $options['lineOffset'];
            }

if (!isset($functions[$name])) {
                continue;
            }

$deconstructed = $this->deconstructArgs($functions[$name], $args);

if (!$deconstructed) {
                continue;
            }

list($domain, $context, $original, $plural) = $deconstructed;

if ((string)$original === '') {
                continue;
            }

$isDefaultDomain = $domain === null;

$domainTranslations = isset($translationByDomain[$domain]) ? $translationByDomain[$domain] : false;

if (!empty($options['domainOnly']) && $isDefaultDomain) {
                // If we want to find translations for a specific domain, skip default domain messages
                continue;
            }

if (!$domainTranslations) {
                continue;
            }

$translation = $domainTranslations->insert($context, $original, $plural);
            $translation->addReference($file, $line);

if (isset($function[3])) {
                /* @var ParsedComment $extractedComment */
                foreach ($function[3] as $extractedComment) {
                    if (in_array($extractedComment, $commentsCache, true)) {
                        continue;
                    }
                    $translation->addExtractedComment($extractedComment->getComment());
                    $commentsCache[] = $extractedComment;
                }
            }
        }
    }

/**
     * Deconstruct arguments to translation values
     *
     * @param $function
     * @param $args
     * @return array|null
     * @throws Exception
     */
    protected function deconstructArgs($function, $args)
    {
        $domain = null;
        $context = null;
        $original = null;
        $plural = null;

switch ($function) {
            case 'noop':
            case 'gettext':
                if (!isset($args[0])) {
                    return null;
                }

$original = $args[0];
                break;
            case 'ngettext':
                if (!isset($args[1])) {
                    return null;
                }

list($original, $plural) = $args;
                break;
            case 'pgettext':
                if (!isset($args[1])) {
                    return null;
                }

list($context, $original) = $args;
                break;
            case 'dgettext':
                if (!isset($args[1])) {
                    return null;
                }

list($domain, $original) = $args;
                break;
            case 'dpgettext':
                if (!isset($args[2])) {
                    return null;
                }

list($domain, $context, $original) = $args;
                break;
            case 'npgettext':
                if (!isset($args[2])) {
                    return null;
                }

list($context, $original, $plural) = $args;
                break;
            case 'dnpgettext':
                if (!isset($args[3])) {
                    return null;
                }

list($domain, $context, $original, $plural) = $args;
                break;
            case 'dngettext':
                if (!isset($args[2])) {
                    return null;
                }

list($domain, $original, $plural) = $args;
                break;
            default:
                throw new Exception(sprintf('Not valid function %s', $function));
        }

return [$domain, $context, $original, $plural];
    }
}