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<?php

// SPDX-FileCopyrightText: 2004-2023 Ryan Parman, Sam Sneddon, Ryan McCue
// SPDX-License-Identifier: BSD-3-Clause

declare(strict_types=1);

namespace SimplePie;

/**
 * Handles `<atom:source>`
 *
 * Used by {@see \SimplePie\Item::get_source()}
 *
 * This class can be overloaded with {@see \SimplePie::set_source_class()}
 */
class Source implements RegistryAware
{
    /** @var Item */
    public $item;
    /** @var array<string, mixed> */
    public $data = [];
    /** @var Registry */
    protected $registry;

/**
     * @param array<string, mixed> $data
     */
    public function __construct(Item $item, array $data)
    {
        $this->item = $item;
        $this->data = $data;
    }

/**
     * @return void
     */
    public function set_registry(\SimplePie\Registry $registry)
    {
        $this->registry = $registry;
    }

/**
     * @return string
     */
    public function __toString()
    {
        return md5(serialize($this->data));
    }

/**
     * @param string $namespace
     * @param string $tag
     * @return array<array<string, mixed>>|null
     */
    public function get_source_tags(string $namespace, string $tag)
    {
        if (isset($this->data['child'][$namespace][$tag])) {
            return $this->data['child'][$namespace][$tag];
        }

return null;
    }

/**
     * @param array<string, mixed> $element
     * @return string
     */
    public function get_base(array $element = [])
    {
        return $this->item->get_base($element);
    }

/**
     * @param string $data
     * @param int-mask-of<SimplePie::CONSTRUCT_*> $type
     * @param string $base
     * @return string
     */
    public function sanitize(string $data, $type, string $base = '')
    {
        return $this->item->sanitize($data, $type, $base);
    }

/**
     * @return Item
     */
    public function get_item()
    {
        return $this->item;
    }

/**
     * @return string|null
     */
    public function get_title()
    {
        if ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_ATOM_10, 'title')) {
            return $this->sanitize($return[0]['data'], $this->registry->call(Misc::class, 'atom_10_construct_type', [$return[0]['attribs']]), $this->get_base($return[0]));
        } elseif ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_ATOM_03, 'title')) {
            return $this->sanitize($return[0]['data'], $this->registry->call(Misc::class, 'atom_03_construct_type', [$return[0]['attribs']]), $this->get_base($return[0]));
        } elseif ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_RSS_10, 'title')) {
            return $this->sanitize($return[0]['data'], \SimplePie\SimplePie::CONSTRUCT_MAYBE_HTML, $this->get_base($return[0]));
        } elseif ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_RSS_090, 'title')) {
            return $this->sanitize($return[0]['data'], \SimplePie\SimplePie::CONSTRUCT_MAYBE_HTML, $this->get_base($return[0]));
        } elseif ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_RSS_20, 'title')) {
            return $this->sanitize($return[0]['data'], \SimplePie\SimplePie::CONSTRUCT_MAYBE_HTML, $this->get_base($return[0]));
        } elseif ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_DC_11, 'title')) {
            return $this->sanitize($return[0]['data'], \SimplePie\SimplePie::CONSTRUCT_TEXT);
        } elseif ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_DC_10, 'title')) {
            return $this->sanitize($return[0]['data'], \SimplePie\SimplePie::CONSTRUCT_TEXT);
        }

return null;
    }

/**
     * @param int $key
     * @return Category|null
     */
    public function get_category(int $key = 0)
    {
        $categories = $this->get_categories();
        if (isset($categories[$key])) {
            return $categories[$key];
        }

return null;
    }

/**
     * @return array<Category>|null
     */
    public function get_categories()
    {
        $categories = [];

foreach ((array) $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_ATOM_10, 'category') as $category) {
            $term = null;
            $scheme = null;
            $label = null;
            if (isset($category['attribs']['']['term'])) {
                $term = $this->sanitize($category['attribs']['']['term'], \SimplePie\SimplePie::CONSTRUCT_TEXT);
            }
            if (isset($category['attribs']['']['scheme'])) {
                $scheme = $this->sanitize($category['attribs']['']['scheme'], \SimplePie\SimplePie::CONSTRUCT_TEXT);
            }
            if (isset($category['attribs']['']['label'])) {
                $label = $this->sanitize($category['attribs']['']['label'], \SimplePie\SimplePie::CONSTRUCT_TEXT);
            }
            $categories[] = $this->registry->create(Category::class, [$term, $scheme, $label]);
        }
        foreach ((array) $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_RSS_20, 'category') as $category) {
            // This is really the label, but keep this as the term also for BC.
            // Label will also work on retrieving because that falls back to term.
            $term = $this->sanitize($category['data'], \SimplePie\SimplePie::CONSTRUCT_TEXT);
            if (isset($category['attribs']['']['domain'])) {
                $scheme = $this->sanitize($category['attribs']['']['domain'], \SimplePie\SimplePie::CONSTRUCT_TEXT);
            } else {
                $scheme = null;
            }
            $categories[] = $this->registry->create(Category::class, [$term, $scheme, null]);
        }
        foreach ((array) $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_DC_11, 'subject') as $category) {
            $categories[] = $this->registry->create(Category::class, [$this->sanitize($category['data'], \SimplePie\SimplePie::CONSTRUCT_TEXT), null, null]);
        }
        foreach ((array) $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_DC_10, 'subject') as $category) {
            $categories[] = $this->registry->create(Category::class, [$this->sanitize($category['data'], \SimplePie\SimplePie::CONSTRUCT_TEXT), null, null]);
        }

if (!empty($categories)) {
            return array_unique($categories);
        }

return null;
    }

/**
     * @param int $key
     * @return Author|null
     */
    public function get_author(int $key = 0)
    {
        $authors = $this->get_authors();
        if (isset($authors[$key])) {
            return $authors[$key];
        }

return null;
    }

/**
     * @return array<Author>|null
     */
    public function get_authors()
    {
        $authors = [];
        foreach ((array) $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_ATOM_10, 'author') as $author) {
            $name = null;
            $uri = null;
            $email = null;
            if (isset($author['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_10]['name'][0]['data'])) {
                $name = $this->sanitize($author['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_10]['name'][0]['data'], \SimplePie\SimplePie::CONSTRUCT_TEXT);
            }
            if (isset($author['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_10]['uri'][0]['data'])) {
                $uri = $author['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_10]['uri'][0];
                $uri = $this->sanitize($uri['data'], \SimplePie\SimplePie::CONSTRUCT_IRI, $this->get_base($uri));
            }
            if (isset($author['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_10]['email'][0]['data'])) {
                $email = $this->sanitize($author['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_10]['email'][0]['data'], \SimplePie\SimplePie::CONSTRUCT_TEXT);
            }
            if ($name !== null || $email !== null || $uri !== null) {
                $authors[] = $this->registry->create(Author::class, [$name, $uri, $email]);
            }
        }
        if ($author = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_ATOM_03, 'author')) {
            $name = null;
            $url = null;
            $email = null;
            if (isset($author[0]['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_03]['name'][0]['data'])) {
                $name = $this->sanitize($author[0]['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_03]['name'][0]['data'], \SimplePie\SimplePie::CONSTRUCT_TEXT);
            }
            if (isset($author[0]['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_03]['url'][0]['data'])) {
                $url = $author[0]['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_03]['url'][0];
                $url = $this->sanitize($url['data'], \SimplePie\SimplePie::CONSTRUCT_IRI, $this->get_base($url));
            }
            if (isset($author[0]['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_03]['email'][0]['data'])) {
                $email = $this->sanitize($author[0]['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_03]['email'][0]['data'], \SimplePie\SimplePie::CONSTRUCT_TEXT);
            }
            if ($name !== null || $email !== null || $url !== null) {
                $authors[] = $this->registry->create(Author::class, [$name, $url, $email]);
            }
        }
        foreach ((array) $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_DC_11, 'creator') as $author) {
            $authors[] = $this->registry->create(Author::class, [$this->sanitize($author['data'], \SimplePie\SimplePie::CONSTRUCT_TEXT), null, null]);
        }
        foreach ((array) $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_DC_10, 'creator') as $author) {
            $authors[] = $this->registry->create(Author::class, [$this->sanitize($author['data'], \SimplePie\SimplePie::CONSTRUCT_TEXT), null, null]);
        }
        foreach ((array) $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_ITUNES, 'author') as $author) {
            $authors[] = $this->registry->create(Author::class, [$this->sanitize($author['data'], \SimplePie\SimplePie::CONSTRUCT_TEXT), null, null]);
        }

if (!empty($authors)) {
            return array_unique($authors);
        }

return null;
    }

/**
     * @param int $key
     * @return Author|null
     */
    public function get_contributor(int $key = 0)
    {
        $contributors = $this->get_contributors();
        if (isset($contributors[$key])) {
            return $contributors[$key];
        }

return null;
    }

/**
     * @return array<Author>|null
     */
    public function get_contributors()
    {
        $contributors = [];
        foreach ((array) $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_ATOM_10, 'contributor') as $contributor) {
            $name = null;
            $uri = null;
            $email = null;
            if (isset($contributor['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_10]['name'][0]['data'])) {
                $name = $this->sanitize($contributor['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_10]['name'][0]['data'], \SimplePie\SimplePie::CONSTRUCT_TEXT);
            }
            if (isset($contributor['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_10]['uri'][0]['data'])) {
                $uri = $contributor['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_10]['uri'][0];
                $uri = $this->sanitize($uri['data'], \SimplePie\SimplePie::CONSTRUCT_IRI, $this->get_base($uri));
            }
            if (isset($contributor['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_10]['email'][0]['data'])) {
                $email = $this->sanitize($contributor['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_10]['email'][0]['data'], \SimplePie\SimplePie::CONSTRUCT_TEXT);
            }
            if ($name !== null || $email !== null || $uri !== null) {
                $contributors[] = $this->registry->create(Author::class, [$name, $uri, $email]);
            }
        }
        foreach ((array) $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_ATOM_03, 'contributor') as $contributor) {
            $name = null;
            $url = null;
            $email = null;
            if (isset($contributor['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_03]['name'][0]['data'])) {
                $name = $this->sanitize($contributor['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_03]['name'][0]['data'], \SimplePie\SimplePie::CONSTRUCT_TEXT);
            }
            if (isset($contributor['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_03]['url'][0]['data'])) {
                $url = $contributor['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_03]['url'][0];
                $url = $this->sanitize($url['data'], \SimplePie\SimplePie::CONSTRUCT_IRI, $this->get_base($url));
            }
            if (isset($contributor['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_03]['email'][0]['data'])) {
                $email = $this->sanitize($contributor['child'][\SimplePie\SimplePie::NAMESPACE_ATOM_03]['email'][0]['data'], \SimplePie\SimplePie::CONSTRUCT_TEXT);
            }
            if ($name !== null || $email !== null || $url !== null) {
                $contributors[] = $this->registry->create(Author::class, [$name, $url, $email]);
            }
        }

if (!empty($contributors)) {
            return array_unique($contributors);
        }

return null;
    }

/**
     * @param int $key
     * @param string $rel
     * @return string|null
     */
    public function get_link(int $key = 0, string $rel = 'alternate')
    {
        $links = $this->get_links($rel);
        if (isset($links[$key])) {
            return $links[$key];
        }

return null;
    }

/**
     * Added for parity between the parent-level and the item/entry-level.
     *
     * @return string|null
     */
    public function get_permalink()
    {
        return $this->get_link(0);
    }

/**
     * @param string $rel
     * @return array<string>|null
     */
    public function get_links(string $rel = 'alternate')
    {
        if (!isset($this->data['links'])) {
            $this->data['links'] = [];
            if ($links = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_ATOM_10, 'link')) {
                foreach ($links as $link) {
                    if (isset($link['attribs']['']['href'])) {
                        $link_rel = (isset($link['attribs']['']['rel'])) ? $link['attribs']['']['rel'] : 'alternate';
                        $this->data['links'][$link_rel][] = $this->sanitize($link['attribs']['']['href'], \SimplePie\SimplePie::CONSTRUCT_IRI, $this->get_base($link));
                    }
                }
            }
            if ($links = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_ATOM_03, 'link')) {
                foreach ($links as $link) {
                    if (isset($link['attribs']['']['href'])) {
                        $link_rel = (isset($link['attribs']['']['rel'])) ? $link['attribs']['']['rel'] : 'alternate';
                        $this->data['links'][$link_rel][] = $this->sanitize($link['attribs']['']['href'], \SimplePie\SimplePie::CONSTRUCT_IRI, $this->get_base($link));
                    }
                }
            }
            if ($links = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_RSS_10, 'link')) {
                $this->data['links']['alternate'][] = $this->sanitize($links[0]['data'], \SimplePie\SimplePie::CONSTRUCT_IRI, $this->get_base($links[0]));
            }
            if ($links = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_RSS_090, 'link')) {
                $this->data['links']['alternate'][] = $this->sanitize($links[0]['data'], \SimplePie\SimplePie::CONSTRUCT_IRI, $this->get_base($links[0]));
            }
            if ($links = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_RSS_20, 'link')) {
                $this->data['links']['alternate'][] = $this->sanitize($links[0]['data'], \SimplePie\SimplePie::CONSTRUCT_IRI, $this->get_base($links[0]));
            }

$keys = array_keys($this->data['links']);
            foreach ($keys as $key) {
                $key = (string) $key;

if ($this->registry->call(Misc::class, 'is_isegment_nz_nc', [$key])) {
                    if (isset($this->data['links'][\SimplePie\SimplePie::IANA_LINK_RELATIONS_REGISTRY . $key])) {
                        $this->data['links'][\SimplePie\SimplePie::IANA_LINK_RELATIONS_REGISTRY . $key] = array_merge($this->data['links'][$key], $this->data['links'][\SimplePie\SimplePie::IANA_LINK_RELATIONS_REGISTRY . $key]);
                        $this->data['links'][$key] = &$this->data['links'][\SimplePie\SimplePie::IANA_LINK_RELATIONS_REGISTRY . $key];
                    } else {
                        $this->data['links'][\SimplePie\SimplePie::IANA_LINK_RELATIONS_REGISTRY . $key] = &$this->data['links'][$key];
                    }
                } elseif (substr($key, 0, 41) === \SimplePie\SimplePie::IANA_LINK_RELATIONS_REGISTRY) {
                    $this->data['links'][substr($key, 41)] = &$this->data['links'][$key];
                }
                $this->data['links'][$key] = array_unique($this->data['links'][$key]);
            }
        }

if (isset($this->data['links'][$rel])) {
            return $this->data['links'][$rel];
        }

return null;
    }

/**
     * @return string|null
     */
    public function get_description()
    {
        if ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_ATOM_10, 'subtitle')) {
            return $this->sanitize($return[0]['data'], $this->registry->call(Misc::class, 'atom_10_construct_type', [$return[0]['attribs']]), $this->get_base($return[0]));
        } elseif ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_ATOM_03, 'tagline')) {
            return $this->sanitize($return[0]['data'], $this->registry->call(Misc::class, 'atom_03_construct_type', [$return[0]['attribs']]), $this->get_base($return[0]));
        } elseif ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_RSS_10, 'description')) {
            return $this->sanitize($return[0]['data'], \SimplePie\SimplePie::CONSTRUCT_MAYBE_HTML, $this->get_base($return[0]));
        } elseif ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_RSS_090, 'description')) {
            return $this->sanitize($return[0]['data'], \SimplePie\SimplePie::CONSTRUCT_MAYBE_HTML, $this->get_base($return[0]));
        } elseif ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_RSS_20, 'description')) {
            return $this->sanitize($return[0]['data'], \SimplePie\SimplePie::CONSTRUCT_MAYBE_HTML, $this->get_base($return[0]));
        } elseif ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_DC_11, 'description')) {
            return $this->sanitize($return[0]['data'], \SimplePie\SimplePie::CONSTRUCT_TEXT);
        } elseif ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_DC_10, 'description')) {
            return $this->sanitize($return[0]['data'], \SimplePie\SimplePie::CONSTRUCT_TEXT);
        } elseif ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_ITUNES, 'summary')) {
            return $this->sanitize($return[0]['data'], \SimplePie\SimplePie::CONSTRUCT_HTML, $this->get_base($return[0]));
        } elseif ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_ITUNES, 'subtitle')) {
            return $this->sanitize($return[0]['data'], \SimplePie\SimplePie::CONSTRUCT_HTML, $this->get_base($return[0]));
        }

return null;
    }

/**
     * @return string|null
     */
    public function get_copyright()
    {
        if ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_ATOM_10, 'rights')) {
            return $this->sanitize($return[0]['data'], $this->registry->call(Misc::class, 'atom_10_construct_type', [$return[0]['attribs']]), $this->get_base($return[0]));
        } elseif ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_ATOM_03, 'copyright')) {
            return $this->sanitize($return[0]['data'], $this->registry->call(Misc::class, 'atom_03_construct_type', [$return[0]['attribs']]), $this->get_base($return[0]));
        } elseif ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_RSS_20, 'copyright')) {
            return $this->sanitize($return[0]['data'], \SimplePie\SimplePie::CONSTRUCT_TEXT);
        } elseif ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_DC_11, 'rights')) {
            return $this->sanitize($return[0]['data'], \SimplePie\SimplePie::CONSTRUCT_TEXT);
        } elseif ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_DC_10, 'rights')) {
            return $this->sanitize($return[0]['data'], \SimplePie\SimplePie::CONSTRUCT_TEXT);
        }

return null;
    }

/**
     * @return string|null
     */
    public function get_language()
    {
        if ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_RSS_20, 'language')) {
            return $this->sanitize($return[0]['data'], \SimplePie\SimplePie::CONSTRUCT_TEXT);
        } elseif ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_DC_11, 'language')) {
            return $this->sanitize($return[0]['data'], \SimplePie\SimplePie::CONSTRUCT_TEXT);
        } elseif ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_DC_10, 'language')) {
            return $this->sanitize($return[0]['data'], \SimplePie\SimplePie::CONSTRUCT_TEXT);
        } elseif (isset($this->data['xml_lang'])) {
            return $this->sanitize($this->data['xml_lang'], \SimplePie\SimplePie::CONSTRUCT_TEXT);
        }

return null;
    }

/**
     * @return float|null
     */
    public function get_latitude()
    {
        if ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_W3C_BASIC_GEO, 'lat')) {
            return (float) $return[0]['data'];
        } elseif (($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_GEORSS, 'point')) && preg_match('/^((?:-)?[0-9]+(?:\.[0-9]+)) ((?:-)?[0-9]+(?:\.[0-9]+))$/', trim($return[0]['data']), $match)) {
            return (float) $match[1];
        }

return null;
    }

/**
     * @return float|null
     */
    public function get_longitude()
    {
        if ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_W3C_BASIC_GEO, 'long')) {
            return (float) $return[0]['data'];
        } elseif ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_W3C_BASIC_GEO, 'lon')) {
            return (float) $return[0]['data'];
        } elseif (($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_GEORSS, 'point')) && preg_match('/^((?:-)?[0-9]+(?:\.[0-9]+)) ((?:-)?[0-9]+(?:\.[0-9]+))$/', trim($return[0]['data']), $match)) {
            return (float) $match[2];
        }

return null;
    }

/**
     * @return string|null
     */
    public function get_image_url()
    {
        if ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_ITUNES, 'image')) {
            return $this->sanitize($return[0]['attribs']['']['href'], \SimplePie\SimplePie::CONSTRUCT_IRI);
        } elseif ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_ATOM_10, 'logo')) {
            return $this->sanitize($return[0]['data'], \SimplePie\SimplePie::CONSTRUCT_IRI, $this->get_base($return[0]));
        } elseif ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_ATOM_10, 'icon')) {
            return $this->sanitize($return[0]['data'], \SimplePie\SimplePie::CONSTRUCT_IRI, $this->get_base($return[0]));
        }

return null;
    }
}

class_alias('SimplePie\Source', 'SimplePie_Source');