grss

type AtomCategory struct {
	AtomCommonAttributes
	Term   string  `xml:"term,attr"`
	Scheme AtomUri `xml:"scheme,attr,omitempty"`
	Label  string  `xml:"label,attr,omitempty"`

	UndefinedContent []UndefinedContent `xml:",any,omitempty"`
}

type AtomCommonAttributes struct {
	Base     AtomUri         `xml:"base,attr,omitempty"`
	Language AtomLanguageTag `xml:"lang,attr,omitempty"`
	// https://github.com/golang/go/issues/3633#issuecomment-328678522
	UndefinedAttribute []xml.Attr `xml:",any,attr,omitempty"`
}

type AtomContent struct {
	AtomCommonAttributes
	Type string   `xml:"type,attr,omitempty"`
	Src  *AtomUri `xml:"src,attr,omitempty"`
	XmlText
	Div *AtomXhtmlDiv `xml:"div,omitempty"`
}

type AtomDateConstruct struct {
	AtomCommonAttributes
	// TODO xsd:dateTime
	DateTime string `xml:",chardata"`
}

type AtomEmailAddress string

type AtomEntry struct {
	AtomCommonAttributes

	Authors      []*AtomPersonConstruct `xml:"author"`
	Categories   []*AtomCategory        `xml:"category,omitempty"`
	Content      *AtomContent           `xml:"content,omitempty"`
	Contributors []*AtomPersonConstruct `xml:"contributor,omitempty"`
	ID           *AtomId                `xml:"id,omitempty"`
	Links        []*AtomLink            `xml:"link,omitempty"`
	Published    *AtomDateConstruct     `xml:"published,omitempty"`
	Rights       *AtomTextConstruct     `xml:"rights,omitempty"`
	Source       *AtomSource            `xml:"source,omitempty"`
	Summary      *AtomTextConstruct     `xml:"summary,omitempty"`
	Title        *AtomTextConstruct     `xml:"title,omitempty"`
	Updated      *AtomDateConstruct     `xml:"updated,omitempty"`

	ExtensionElement []XmlGeneric `xml:",any"`
}

type AtomFeed struct {
	XMLName xml.Name

	AtomCommonAttributes

	Authors      []*AtomPersonConstruct `xml:"author,omitempty"`
	Categories   []*AtomCategory        `xml:"category,omitempty"`
	Contributors []*AtomPersonConstruct `xml:"contributor,omitempty"`
	Generator    *AtomGenerator         `xml:"generator,omitempty"`
	Icon         *AtomIcon              `xml:"icon,omitempty"`
	ID           AtomId                 `xml:"id"`
	Links        []*AtomLink            `xml:"link,omitempty"`
	Logo         *AtomLogo              `xml:"logo,omitempty"`
	Rights       *AtomTextConstruct     `xml:"rights,omitempty"`
	Subtitle     *AtomTextConstruct     `xml:"subtitle,omitempty"`
	Title        *AtomTextConstruct     `xml:"title,omitempty"`
	Updated      *AtomDateConstruct     `xml:"updated,omitempty"`

	ExtensionElement []XmlGeneric `xml:",any"`

	Entries []*AtomEntry `xml:"entry,omitempty"`
}

type AtomGenerator struct {
	AtomCommonAttributes
	URI     AtomUri `xml:"uri,attr,omitempty"`
	Version string  `xml:"version,attr,omitempty"`
	Text    string  `xml:",chardata"`
}

type AtomIcon struct {
	AtomCommonAttributes
	AtomUri `xml:",chardata"`
}

type AtomId struct {
	AtomCommonAttributes
	AtomUri `xml:",chardata"`
}

type AtomLanguageTag string

type AtomLink struct {
	AtomCommonAttributes
	Href AtomUri `xml:"href,attr"`
	// TODO rel { atomNCName | atomUri }
	Rel      string          `xml:"rel,attr,omitempty"`
	Type     AtomMediaType   `xml:"type,attr,omitempty"`
	Hreflang AtomLanguageTag `xml:"hreflang,attr,omitempty"`
	Title    string          `xml:"title,attr,omitempty"`
	Length   string          `xml:"length,attr,omitempty"`

	UndefinedContent []UndefinedContent `xml:",any"`
}

type AtomLogo struct {
	AtomCommonAttributes
	AtomUri `xml:",chardata"`
}

type AtomMediaType string

type AtomNCName string

type AtomPersonConstruct struct {
	AtomCommonAttributes
	Name  string           `xml:"name,omitempty"`
	Uri   AtomUri          `xml:"uri,omitempty"`
	Email AtomEmailAddress `xml:"email,omitempty"`
}

type AtomSource struct {
	AtomCommonAttributes

	Authors      []*AtomPersonConstruct `xml:"author"`
	Categories   []*AtomCategory        `xml:"category,omitempty"`
	Contributors []*AtomPersonConstruct `xml:"contributor,omitempty"`
	Generator    *AtomGenerator         `xml:"generator,omitempty"`
	Icon         *AtomIcon              `xml:"icon,omitempty"`
	ID           AtomId                 `xml:"id"`
	Links        []*AtomLink            `xml:"link,omitempty"`
	Logo         *AtomLogo              `xml:"logo,omitempty"`
	Rights       *AtomTextConstruct     `xml:"rights,omitempty"`
	Subtitle     *AtomTextConstruct     `xml:"subtitle,omitempty"`
	Title        *AtomTextConstruct     `xml:"title"`
	Updated      *AtomDateConstruct     `xml:"updated,omitempty"`

	ExtensionElement []XmlGeneric `xml:",any"`
}

type AtomTextConstruct struct {
	AtomCommonAttributes
	Type string `xml:"type,attr,omitempty"`
	XmlText
	Div *AtomXhtmlDiv `xml:"div,omitempty"`
}

type AtomUri string

type AtomXhtmlDiv struct {
	UndefinedAttribute []xml.Attr `xml:",any,attr,omitempty"`
	// TODO text | anyXHTML
	XmlText
}

type Feed interface {
	Uniform()
	Mime(fallback bool) string
	ToJSON() *JSONFeed
	ToRss() *RssFeed
	ToAtom() *AtomFeed
	WriteOut(w io.Writer) error
}

type JSONAttachments struct {
	// URL url (required, string) specifies the location of the attachment.
	URL string `json:"url,omitempty"`

	// MimeType mime_type (required, string) specifies the type of the attachment, such as “audio/mpeg.”
	MimeType string `json:"mime_type,omitempty"`

	// Title title (optional, string) is a name for the attachment. Important: if there are multiple attachments, and two or more have the exact same title (when title is present), then they are considered as alternate representations of the same thing. In this way a podcaster, for instance, might provide an audio recording in different formats.
	Title string `json:"title,omitempty"`

	// SizeInBytes size_in_bytes (optional, number) specifies how large the file is.
	SizeInBytes uint64 `json:"size_in_bytes,omitempty"`

	// DurationInSeconds duration_in_seconds (optional, number) specifies how long it takes to listen to or watch, when played at normal speed.
	DurationInSeconds uint64 `json:"duration_in_seconds,omitempty"`
}

type JSONAuthor struct {
	// Name name (optional, string) is the author’s name.
	Name string `json:"name,omitempty"`

	// URL url (optional, string) is the URL of a site owned by the author. It could be a blog, micro-blog, Twitter account, and so on. Ideally the linked-to page provides a way to contact the author, but that’s not required. The URL could be a mailto: link, though we suspect that will be rare.
	URL string `json:"url,omitempty"`

	// Avatar avatar (optional, string) is the URL for an image for the author. As with icon, it should be square and relatively large — such as 512 x 512 — and should use transparency where appropriate, since it may be rendered on a non-white background.
	Avatar string `json:"avatar,omitempty"`
}

type JSONFeed struct {

	// Version version (required, string) is the URL of the version of the format the feed uses. This should appear at the very top, though we recognize that not all JSON generators allow for ordering.
	Version string `json:"version,omitempty"`

	// Title title (required, string) is the name of the feed, which will often correspond to the name of the website (blog, for instance), though not necessarily.
	Title string `json:"title,omitempty"`

	// HomePageURL home_page_url (optional but strongly recommended, string) is the URL of the resource that the feed describes. This resource may or may not actually be a “home” page, but it should be an HTML page. If a feed is published on the public web, this should be considered as required. But it may not make sense in the case of a file created on a desktop computer, when that file is not shared or is shared only privately.
	HomePageURL string `json:"home_page_url,omitempty"`

	// FeedURL feed_url (optional but strongly recommended, string) is the URL of the feed, and serves as the unique identifier for the feed. As with home_page_url, this should be considered required for feeds on the public web.
	FeedURL string `json:"feed_url,omitempty"`

	// Description description (optional, string) provides more detail, beyond the title, on what the feed is about. A feed reader may display this text.
	Description string `json:"description,omitempty"`

	// UserComment user_comment (optional, string) is a description of the purpose of the feed. This is for the use of people looking at the raw JSON, and should be ignored by feed readers.
	UserComment string `json:"user_comment,omitempty"`

	// NextURL next_url (optional, string) is the URL of a feed that provides the next n items, where n is determined by the publisher. This allows for pagination, but with the expectation that reader software is not required to use it and probably won’t use it very often. next_url must not be the same as feed_url, and it must not be the same as a previous next_url (to avoid infinite loops).
	NextURL string `json:"next_url,omitempty"`

	// Icon icon (optional, string) is the URL of an image for the feed suitable to be used in a timeline, much the way an avatar might be used. It should be square and relatively large — such as 512 x 512 — so that it can be scaled-down and so that it can look good on retina displays. It should use transparency where appropriate, since it may be rendered on a non-white background.
	Icon string `json:"icon,omitempty"`

	// Favicon favicon (optional, string) is the URL of an image for the feed suitable to be used in a source list. It should be square and relatively small, but not smaller than 64 x 64 (so that it can look good on retina displays). As with icon, this image should use transparency where appropriate, since it may be rendered on a non-white background.
	Favicon string `json:"favicon,omitempty"`

	// Author author (optional, object) specifies the feed author. The author object has several members. These are all optional — but if you provide an author object, then at least one is required:
	Author *JSONAuthor `json:"author,omitempty"`

	// Expired expired (optional, boolean) says whether or not the feed is finished — that is, whether or not it will ever update again. A feed for a temporary event, such as an instance of the Olympics, could expire. If the value is true, then it’s expired. Any other value, or the absence of expired, means the feed may continue to update.
	Expired *bool `json:"expired,omitempty"`

	// Items is an array, and is required. An item includes:
	Items []*JSONItem `json:"items,omitempty"`

	// Hub Subscribing to Real-time Notifications
	Hub interface{} `json:"-"`

	// Extensions Publishers can use custom objects in JSON Feeds. Names must start with an _ character followed by a letter. Custom objects can appear anywhere in a feed.
	Extensions map[string]interface{} `json:"-"`

	// Authors authors (optional, array of objects) specifies one or more feed authors. The author object has several members. These are all optional — but if you provide an author object, then at least one is required:
	Authors []*JSONAuthor `json:"authors,omitempty"`

	// Language language (optional, string) is the primary language for the feed in the format specified in RFC 5646. The value is usually a 2-letter language tag from ISO 639-1, optionally followed by a region tag. (Examples: en or en-US.)
	Language string `json:"language,omitempty"`
}

type JSONItem struct {

	// ID id (required, string) is unique for that item for that feed over time. If an item is ever updated, the id should be unchanged. New items should never use a previously-used id. If an id is presented as a number or other type, a JSON Feed reader must coerce it to a string. Ideally, the id is the full URL of the resource described by the item, since URLs make great unique identifiers.
	ID string `json:"id,omitempty"`

	// URL url (optional, string) is the URL of the resource described by the item. It’s the permalink. This may be the same as the id — but should be present regardless.
	URL string `json:"url,omitempty"`

	// ExternalURL external_url (very optional, string) is the URL of a page elsewhere. This is especially useful for linkblogs. If url links to where you’re talking about a thing, then external_url links to the thing you’re talking about.
	ExternalURL string `json:"external_url,omitempty"`

	// Title title (optional, string) is plain text. Microblog items in particular may omit titles.
	Title string `json:"title,omitempty"`

	// ContentHTML content_html and content_text are each optional strings — but one or both must be present. This is the HTML or plain text of the item. Important: the only place HTML is allowed in this format is in content_html. A Twitter-like service might use content_text, while a blog might use content_html. Use whichever makes sense for your resource. (It doesn’t even have to be the same for each item in a feed.)
	ContentHTML string `json:"content_html,omitempty"`

	// ContentText same as ContentHTML
	ContentText string `json:"content_text,omitempty"`

	// Summary summary (optional, string) is a plain text sentence or two describing the item. This might be presented in a timeline, for instance, where a detail view would display all of content_html or content_text.
	Summary string `json:"summary,omitempty"`

	// Image image (optional, string) is the URL of the main image for the item. This image may also appear in the content_html — if so, it’s a hint to the feed reader that this is the main, featured image. Feed readers may use the image as a preview (probably resized as a thumbnail and placed in a timeline).
	Image string `json:"image,omitempty"`

	// BannerImage banner_image (optional, string) is the URL of an image to use as a banner. Some blogging systems (such as Medium) display a different banner image chosen to go with each post, but that image wouldn’t otherwise appear in the content_html. A feed reader with a detail view may choose to show this banner image at the top of the detail view, possibly with the title overlaid.
	BannerImage string `json:"banner_image,omitempty"`

	// DatePublished date_published (optional, string) specifies the date in RFC 3339 format. (Example: 2010-02-07T14:04:00-05:00.)
	DatePublished string `json:"date_published,omitempty"`

	// DateModified date_modified (optional, string) specifies the modification date in RFC 3339 format.
	DateModified string `json:"date_modified,omitempty"`

	// Author author (optional, object) has the same structure as the top-level author. If not specified in an item, then the top-level author, if present, is the author of the item.
	Author *JSONAuthor `json:"author,omitempty"`

	// Tags tags (optional, array of strings) can have any plain text values you want. Tags tend to be just one word, but they may be anything. Note: they are not the equivalent of Twitter hashtags. Some blogging systems and other feed formats call these categories.
	Tags []string `json:"tags,omitempty"`

	// Attachments An individual item may have one or more attachments.
	Attachments []*JSONAttachments `json:"attachments,omitempty"`

	// Extensions Publishers can use custom objects in JSON Feeds. Names must start with an _ character followed by a letter. Custom objects can appear anywhere in a feed.
	Extensions map[string]interface{} `json:"-"`

	// Authors authors (optional, array of objects) has the same structure as the top-level authors. If not specified in an item, then the top-level authors, if present, are the authors of the item.
	Authors []*JSONAuthor `json:"authors,omitempty"`

	// Language language (optional, string) is the language for this item, using the same format as the top-level language field. The value can be different than the primary language for the feed when a specific item is written in a different language than other items in the feed.
	Language string `json:"language,omitempty"`
}

type RssAuthor struct {
	Email string `xml:",chardata"`
}

type RssCategory struct {
	// Domain a string that identifies a categorization taxonomy.
	Domain string `xml:"domain,attr,omitempty"`
	// Text The value of the element is a forward-slash-separated string that identifies a hierarchic location in the indicated taxonomy. Processors may establish conventions for the interpretation of categories.
	Text string `xml:",chardata"`
}

type RssChannel struct {
	Attributes []xml.Attr `xml:",any,attr,omitempty"`

	// Title The name of the channel. It's how people refer to your service. If you have an HTML website that contains the same information as your RSS file, the title of your channel should be the same as the title of your website.
	Title XmlText `xml:"title"`
	// Link The URL to the HTML website corresponding to the channel.
	Link string `xml:"link"`
	// Description	Phrase or sentence describing the channel.
	Description XmlText `xml:"description"`

	// Language the channel is written in. This allows aggregators to group all Italian language sites, for example, on a single page. A list of allowable values for this element, as provided by Netscape, is here. You may also use values defined by the W3C.
	Language string `xml:"language,omitempty"`
	// 	Copyright notice for content in the channel.
	Copyright string `xml:"copyright,omitempty"`
	// ManagingEditor Email address for person responsible for editorial content.
	ManagingEditor string `xml:"managingEditor,omitempty"`
	// WebMaster Email address for person responsible for technical issues relating to channel.
	WebMaster string `xml:"webMaster,omitempty"`
	// PubDate The publication date for the content in the channel. For example, the New York Times publishes on a daily basis, the publication date flips once every 24 hours. That's when the pubDate of the channel changes. All date-times in RSS conform to the Date and Time Specification of RFC 822, with the exception that the year may be expressed with two characters or four characters (four preferred).
	// TODO w3c pubDate must be an RFC-822 date-time
	PubDate string `xml:"pubDate,omitempty"`
	// LastBuildDate The last time the content of the channel changed.
	LastBuildDate string `xml:"lastBuildDate,omitempty"`
	// Categories Specify one or more categories that the channel belongs to. Follows the same rules as the <item>-level category element.
	Categories []*RssCategory `xml:"category,omitempty"`
	// Generator A string indicating the program used to generate the channel.
	Generator string `xml:"generator,omitempty"`
	// Docs A URL that points to the documentation for the format used in the RSS file. It's probably a pointer to this page. It's for people who might stumble across an RSS file on a Web server 25 years from now and wonder what it is.
	Docs string `xml:"docs,omitempty"`
	// Cloud Allows processes to register with a cloud to be notified of updates to the channel, implementing a lightweight publish-subscribe protocol for RSS feeds
	Cloud *XmlGeneric `xml:"cloud,omitempty"`
	// Ttl stands for time to live. It's a number of minutes that indicates how long a channel can be cached before refreshing from the source.
	Ttl string `xml:"ttl,omitempty"`
	// Image Specifies a GIF, JPEG or PNG image that can be displayed with the channel.
	Image *RssImage `xml:"image,omitempty"`
	// Rating The PICS rating for the channel.
	Rating *XmlGeneric `xml:"rating,omitempty"`
	// TextInput Specifies a text input box that can be displayed with the channel.
	TextInput *RssTextInput `xml:"textinput,omitempty"`
	// SkipHours A hint for aggregators telling them which hours they can skip.
	SkipHours *RssSkipHours `xml:"skipHours,omitempty"`
	// SkipDays A hint for aggregators telling them which days they can skip.
	SkipDays *RssSkipDays `xml:"skipDays,omitempty"`

	Items []*RssItem `xml:"item,omitempty"`

	ExtensionElement []XmlGeneric `xml:",any"`
}

type RssContent struct {
	XMLName xml.Name
	XmlText
}

type RssEnclosure struct {
	// Length Defines the length (in bytes) of the media file
	Length string `xml:"length,attr,omitempty"`
	// Type Defines the type of media file
	Type string `xml:"type,attr,omitempty"`
	// Url Defines the URL to the media file
	Url string `xml:"url,attr,omitempty"`
}

type RssFeed struct {
	XMLName xml.Name

	Attributes []xml.Attr `xml:",any,attr,omitempty"`
	Version    string     `xml:"version,attr,omitempty"`

	Channel *RssChannel `xml:"channel,omitempty"`

	// 0.90
	Image     *RssImage     `xml:"image,omitempty"`
	Items     []*RssItem    `xml:"item,omitempty"`
	TextInput *RssTextInput `xml:"textinput,omitempty"`
}

type RssGuid struct {
	// IsPermaLink If the guid element has an attribute named isPermaLink with a value of true, the reader may assume that it is a permalink to the item, that is, a url that can be opened in a Web browser, that points to the full item described by the <item> element. IsPermaLink is optional, its default value is true. If its value is false, the guid may not be assumed to be a url, or a url to anything in particular.
	IsPermaLink string `xml:"isPermaLink,attr,omitempty"`
	Guid        string `xml:",chardata"`
}

type RssImage struct {
	// Url is the URL of a GIF, JPEG or PNG image that represents the channel.
	Url string `xml:"url,omitempty"`
	// Title describes the image, it's used in the ALT attribute of the HTML <img> tag when the channel is rendered in HTML.
	Title string `xml:"title,omitempty"`
	// Link is the URL of the site, when the channel is rendered, the image is a link to the site. (Note, in practice the image <title> and <link> should have the same value as the channel's <title> and <link>.
	Link string `xml:"link,omitempty"`
	// Width indicating the width of the image in pixels. Maximum value for width is 144, default value is 88.
	Width string `xml:"width,omitempty"`
	// Height indicating the height of the image in pixels. Maximum value for height is 400, default value is 31.
	Height string `xml:"height,omitempty"`
	// Description contains text that is included in the TITLE attribute of the link formed around the image in the HTML
	Description string `xml:"description,omitempty"`
}

type RssItem struct {
	// Title of the item.
	Title string `xml:"title,omitempty"`
	// Link The URL of the item.
	Link string `xml:"link,omitempty"`
	// Description	The item synopsis.
	Description string `xml:"description,omitempty"`
	// Email address of the author of the item.
	Author *RssAuthor `xml:"author,omitempty"`
	// Categories Includes the item in one or more categories.
	Categories []*RssCategory `xml:"category,omitempty"`
	// Comments URL of a page for comments relating to the item.
	Comments string `xml:"comments,omitempty"`
	// Enclosure Describes a media object that is attached to the item.
	Enclosure *RssEnclosure `xml:"enclosure,omitempty"`
	// Guid A string that uniquely identifies the item.
	Guid *RssGuid `xml:"guid,omitempty"`
	// PubDate Indicates when the item was published.
	PubDate string `xml:"pubDate,omitempty"`
	// Source The RSS channel that the item came from.
	Source *RssSource `xml:"source,omitempty"`

	//Content        *RssContent `xml:"content,omitempty"`
	ContentEncoded *RssContent `xml:"http://purl.org/rss/1.0/modules/content/ encoded,omitempty"`
}

type RssSkipDays struct {
	Days []string `xml:"day,omitempty"`
}

type RssSkipHours struct {
	Hours []string `xml:"hour,omitempty"`
}

type RssSource struct {
	// Url Specifies the link to the source
	Url  string `xml:"url,attr,omitempty"`
	Text string `xml:",chardata"`
}

type RssTextInput struct {
	// Title The label of the Submit button in the text input area.
	Title string `xml:"title,omitempty"`
	// Description Explains the text input area.
	Description string `xml:"description,omitempty"`
	// Name The name of the text object in the text input area.
	Name string `xml:"name,omitempty"`
	// Link The URL of the CGI script that processes text input requests.
	Link string `xml:"link,omitempty"`
}

type Type int

type UndefinedContent struct {
	XMLName    xml.Name
	Attributes []xml.Attr `xml:",any,attr,omitempty"`
	XmlText
}

type XmlGeneric struct {
	XMLName    xml.Name
	Attributes []xml.Attr `xml:",any,attr,omitempty"`
	XmlText
}

type XmlText struct {
	Text     string `xml:",chardata"`
	Cdata    string `xml:",cdata"`
	InnerXml string `xml:",innerxml"`
}