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