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//! This crate provides an API to parse and create [OPML documents].
//!
//! [OPML documents]: http://opml.org/spec2.opml
//!
//! ## Parsing
//!
//! To parse an OPML document use [`OPML::from_str`] or [`OPML::from_reader`].
//!
//! Parsing will result in an error if:
//! * the XML is malformed,
//! * the included OPML version is not supported (currently all OPML versions
//! (1.0, 1.1 and 2.0) are supported) or,
//! * if the [`Body`] element contains no child [`Outline`] elements,
//! [as per the spec].
//!
//! [as per the spec]: http://opml.org/spec2.opml#1629042198000
//!
//! ```rust
//! use opml::OPML;
//!
//! let xml = r#"<opml version="2.0"><head/><body><outline text="Outline"/></body></opml>"#;
//! let document = OPML::from_str(xml).unwrap();
//!
//! assert_eq!(document.version, "2.0");
//! ```
//!
//! ## Creating
//!
//! To create an OPML document from scratch, use [`OPML::default()`] or the good
//! old `OPML { /* ... */ }` syntax.
#![forbid(unsafe_code)]
#![warn(missing_docs, clippy::missing_docs_in_private_items)]
use hard_xml::{XmlRead, XmlWrite};
use serde::{Deserialize, Serialize};
use thiserror::Error;
/// All possible errors.
#[derive(Debug, Error)]
pub enum Error {
/// [From the spec], "a `<body>` contains one or more `<outline>` elements".
///
/// [From the spec]: http://opml.org/spec2.opml#1629042198000
#[error("OPML body has no <outline> elements")]
BodyHasNoOutlines,
/// Wrapper for [`std::io::Error`].
#[error("Failed to read file")]
IoError(#[from] std::io::Error),
/// The version string in the XML is not supported.
#[error("Unsupported OPML version: {0:?}")]
UnsupportedVersion(String),
/// The input string is not valid XML.
#[error("Failed to process XML file")]
XmlError(#[from] hard_xml::XmlError),
}
/// The top-level [`OPML`] element.
#[derive(
XmlWrite, XmlRead, PartialEq, Eq, Debug, Clone, Serialize, Deserialize,
)]
#[xml(tag = "opml")]
pub struct OPML {
/// The version attribute from the element, valid values are `1.0`, `1.1` and
/// `2.0`.
#[xml(attr = "version")]
pub version: String,
/// The [`Head`] child element. Contains the metadata of the OPML document.
#[xml(child = "head")]
pub head: Option<Head>,
/// The [`Body`] child element. Contains all the [`Outline`] elements.
#[xml(child = "body")]
pub body: Body,
}
impl OPML {
/// Deprecated, use [`OPML::from_str`] instead.
#[deprecated(note = "Use from_str instead", since = "1.1.0")]
pub fn new(xml: &str) -> Result<Self, Error> {
Self::from_str(xml).map_err(Into::into)
}
/// Parses an OPML document.
///
/// # Example
///
/// ```rust
/// use opml::{OPML, Outline};
///
/// let xml = r#"<opml version="2.0"><head/><body><outline text="Outline"/></body></opml>"#;
/// let document = OPML::from_str(xml).unwrap();
///
/// let mut expected = OPML::default();
/// expected.body.outlines.push(Outline {
/// text: "Outline".to_string(),
/// ..Outline::default()
/// });
///
/// assert_eq!(document, expected);
/// ```
#[allow(clippy::should_implement_trait)]
pub fn from_str(xml: &str) -> Result<Self, Error> {
let opml = <OPML as XmlRead>::from_str(xml)?;
// SPEC: The version attribute is a version string, of the form, x.y, where
// x and y are both numeric strings.
let valid_versions = ["1.0", "1.1", "2.0"];
if !valid_versions.contains(&opml.version.as_str()) {
return Err(Error::UnsupportedVersion(opml.version));
}
// SPEC: A `<body>` contains one or more `<outline>` elements.
if opml.body.outlines.is_empty() {
return Err(Error::BodyHasNoOutlines);
}
Ok(opml)
}
/// Parses an OPML document from a reader.
///
/// # Example
///
/// ```rust,no_run
/// use opml::OPML;
///
/// let mut file = std::fs::File::open("file.opml").unwrap();
/// let document = OPML::from_reader(&mut file).unwrap();
/// ```
pub fn from_reader<R>(reader: &mut R) -> Result<Self, Error>
where
R: std::io::Read,
{
let mut s = String::new();
reader.read_to_string(&mut s)?;
Self::from_str(&s).map_err(Into::into)
}
/// Helper function to add an [`Outline`] element with `text` and `xml_url`
/// attributes to the [`Body`]. Useful for creating feed lists quickly.
/// This function also exists as [`Outline::add_feed`] for grouped lists.
///
/// # Example
///
/// ```rust
/// use opml::{OPML, Outline};
///
/// let mut opml = OPML::default();
/// opml.add_feed("Feed Name", "https://example.com/");
/// let added_feed = opml.body.outlines.first().unwrap();
///
/// let expected_feed = &Outline {
/// text: "Feed Name".to_string(),
/// xml_url: Some("https://example.com/".to_string()),
/// ..Outline::default()
/// };
///
/// assert_eq!(added_feed, expected_feed);
/// ```
pub fn add_feed(&mut self, text: &str, url: &str) -> &mut Self {
self.body.outlines.push(Outline {
text: text.to_string(),
xml_url: Some(url.to_string()),
..Outline::default()
});
self
}
/// Deprecated, use [`OPML::to_string`] instead.
#[deprecated(note = "Use to_string instead", since = "1.1.0")]
pub fn to_xml(&self) -> Result<String, Error> {
self.to_string()
}
/// Converts the struct to an XML document.
///
/// # Example
///
/// ```rust
/// use opml::OPML;
///
/// let opml = OPML::default();
/// let xml = opml.to_string().unwrap();
///
/// let expected = r#"<opml version="2.0"><head/><body/></opml>"#;
/// assert_eq!(xml, expected);
/// ```
pub fn to_string(&self) -> Result<String, Error> {
Ok(XmlWrite::to_string(self)?)
}
/// Converts the struct to an XML document and writes it using the writer.
///
/// # Example
///
/// ```rust,no_run
/// use opml::OPML;
///
/// let opml = OPML::default();
/// let mut file = std::fs::File::create("file.opml").unwrap();
/// let xml = opml.to_writer(&mut file).unwrap();
/// ```
pub fn to_writer<W>(&self, writer: &mut W) -> Result<(), Error>
where
W: std::io::Write,
{
let xml_string = self.to_string()?;
writer.write_all(xml_string.as_bytes())?;
Ok(())
}
}
impl Default for OPML {
fn default() -> Self {
OPML {
version: "2.0".to_string(),
head: Some(Head::default()),
body: Body::default(),
}
}
}
/// The [`Head`] child element of [`OPML`]. Contains the metadata of the OPML
/// document.
#[derive(
XmlWrite,
XmlRead,
PartialEq,
Eq,
Debug,
Clone,
Default,
Serialize,
Deserialize,
)]
#[xml(tag = "head")]
pub struct Head {
/// The title of the document.
#[xml(flatten_text = "title")]
pub title: Option<String>,
/// A date-time (RFC822) indicating when the document was created.
#[xml(flatten_text = "dateCreated")]
pub date_created: Option<String>,
/// A date-time (RFC822) indicating when the document was last modified.
#[xml(flatten_text = "dateModified")]
pub date_modified: Option<String>,
/// The name of the document owner.
#[xml(flatten_text = "ownerName")]
pub owner_name: Option<String>,
/// The email address of the document owner.
#[xml(flatten_text = "ownerEmail")]
pub owner_email: Option<String>,
/// A link to the website of the document owner.
#[xml(flatten_text = "ownerId")]
pub owner_id: Option<String>,
/// A link to the documentation of the OPML format used for this document.
#[xml(flatten_text = "docs")]
pub docs: Option<String>,
/// A comma-separated list of line numbers that are expanded. The line numbers
/// in the list tell you which headlines to expand. The order is important.
/// For each element in the list, X, starting at the first summit, navigate
/// flatdown X times and expand. Repeat for each element in the list.
#[xml(flatten_text = "expansionState")]
pub expansion_state: Option<String>,
/// A number indicating which line of the outline is displayed on the top line
/// of the window. This number is calculated with the expansion state already
/// applied.
#[xml(flatten_text = "vertScrollState")]
pub vert_scroll_state: Option<i32>,
/// The pixel location of the top edge of the window.
#[xml(flatten_text = "windowTop")]
pub window_top: Option<i32>,
/// The pixel location of the left edge of the window.
#[xml(flatten_text = "windowLeft")]
pub window_left: Option<i32>,
/// The pixel location of the bottom edge of the window.
#[xml(flatten_text = "windowBottom")]
pub window_bottom: Option<i32>,
/// The pixel location of the right edge of the window.
#[xml(flatten_text = "windowRight")]
pub window_right: Option<i32>,
}
/// The [`Body`] child element of [`OPML`]. Contains all the [`Outline`]
/// elements.
#[derive(
XmlWrite,
XmlRead,
PartialEq,
Eq,
Debug,
Clone,
Default,
Serialize,
Deserialize,
)]
#[xml(tag = "body")]
pub struct Body {
/// All the top-level [`Outline`] elements.
#[xml(child = "outline")]
pub outlines: Vec<Outline>,
}
/// The [`Outline`] element.
#[derive(
XmlWrite,
XmlRead,
PartialEq,
Eq,
Debug,
Clone,
Default,
Serialize,
Deserialize,
)]
#[xml(tag = "outline")]
pub struct Outline {
/// Every outline element must have at least a text attribute, which is what
/// is displayed when an outliner opens the OPML document.
///
/// Version 1.0 OPML documents may omit this attribute, so for compatibility
/// and strictness this attribute is "technically optional" as it will be
/// replaced by an empty String if it is omitted.
///
/// Text attributes may contain encoded HTML markup.
#[xml(default, attr = "text")]
pub text: String,
/// A string that indicates how the other attributes of the [`Outline`]
/// should be interpreted.
#[xml(attr = "type")]
pub r#type: Option<String>,
/// Indicating whether the outline is commented or not. By convention if an
/// outline is commented, all subordinate outlines are considered to also be
/// commented.
#[xml(attr = "isComment")]
pub is_comment: Option<bool>,
/// Indicating whether a breakpoint is set on this outline. This attribute is
/// mainly necessary for outlines used to edit scripts.
#[xml(attr = "isBreakpoint")]
pub is_breakpoint: Option<bool>,
/// The date-time (RFC822) that this [`Outline`] element was created.
#[xml(attr = "created")]
pub created: Option<String>,
/// A string of comma-separated slash-delimited category strings, in the
/// format defined by the [RSS 2.0 category] element. To represent a "tag",
/// the category string should contain no slashes.
///
/// [RSS 2.0 category]: https://cyber.law.harvard.edu/rss/rss.html#ltcategorygtSubelementOfLtitemgt
#[xml(attr = "category")]
pub category: Option<String>,
/// Child [`Outline`] elements of the current one.
#[xml(child = "outline")]
pub outlines: Vec<Outline>,
/// The HTTP address of the feed.
#[xml(attr = "xmlUrl")]
pub xml_url: Option<String>,
/// The top-level description element from the feed.
#[xml(attr = "description")]
pub description: Option<String>,
/// The top-level link element from the feed.
#[xml(attr = "htmlUrl")]
pub html_url: Option<String>,
/// The top-level language element from the feed.
#[xml(attr = "language")]
pub language: Option<String>,
/// The top-level title element from the feed.
#[xml(attr = "title")]
pub title: Option<String>,
/// The version of the feed's format (such as RSS 0.91, 2.0, ...).
#[xml(attr = "version")]
pub version: Option<String>,
/// A link that can point to another OPML document or to something that can
/// be displayed in a web browser.
#[xml(attr = "url")]
pub url: Option<String>,
}
impl Outline {
/// Helper function to add an [`Outline`] element with `text` and `xml_url`
/// attributes as a child element, useful for creating grouped lists. This
/// function also exists as [`OPML::add_feed`] for non-grouped lists.
///
/// # Example
///
/// ```rust
/// use opml::Outline;
///
/// let mut group = Outline::default();
/// group.add_feed("Feed Name", "https://example.com/");
/// let added_feed = group.outlines.first().unwrap();
///
/// let expected_feed = &Outline {
/// text: "Feed Name".to_string(),
/// xml_url: Some("https://example.com/".to_string()),
/// ..Outline::default()
/// };
///
/// assert_eq!(added_feed, expected_feed);
/// ```
pub fn add_feed(&mut self, name: &str, url: &str) -> &mut Self {
self.outlines.push(Outline {
text: name.to_string(),
xml_url: Some(url.to_string()),
..Outline::default()
});
self
}
}