1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360
//! This crate provides an API to parse and construct //! [OPML documents](http://dev.opml.org/spec2.html) to and from regular Rust //! structs. //! //! ## Getting Started //! //! ### Parsing //! //! Parsing XML into [an OPML struct](struct.OPML.html) can be done with //! [`OPML::new()`](struct.OPML.html#method.new). Resulting in an error if the //! XML can't be parsed, if the included OPML version is not supported //! (currently all OPML versions (1.0, 1.1 and 2.0) are supported) or if the //! [Body](struct.Body.html) element contains no child //! [Outline](struct.Outline.html) elements, //! [as per the spec](http://dev.opml.org/spec2.html#whatIsALtbodygt). //! //! ```rust //! use opml::{OPML, Outline}; //! //! let xml = r#"<opml version="2.0"><head/><body><outline text="Outline"/></body></opml>"#; //! let parsed = OPML::new(xml).unwrap(); //! //! let mut expected = OPML::default(); //! expected.body.outlines.push(Outline { //! text: "Outline".to_string(), //! ..Outline::default() //! }); //! //! println!("{:#?}", parsed); //! assert_eq!(parsed, expected); //! ``` //! //! ### Constructing //! //! Constructing OPMLs is very easy as all you have to do is instantiate the //! [OPML struct](struct.OPML.html) with //! [`OPML::default()`](struct.OPML.html#method.default), add anything wanted //! and then call [`OPML::to_xml()`](struct.OPML.html#method.to_xml) to return //! the XML as a string. //! //! ```rust //! use opml::{Head, OPML}; //! //! let mut opml = OPML::default(); //! opml.head = Some(Head { //! title: Some("Rust Feeds".to_string()), //! ..Head::default() //! }); //! opml //! .add_feed("Rust Blog", "https://blog.rust-lang.org/feed.xml") //! .add_feed( //! "Inside Rust", //! "https://blog.rust-lang.org/inside-rust/feed.xml", //! ); //! //! let xml = opml.to_xml().unwrap(); //! let expected = r#"<opml version="2.0"><head><title>Rust Feeds</title></head><body><outline text="Rust Blog" xmlUrl="https://blog.rust-lang.org/feed.xml"/><outline text="Inside Rust" xmlUrl="https://blog.rust-lang.org/inside-rust/feed.xml"/></body></opml>"#; //! println!("{}", xml); //! assert_eq!(xml, expected); //! ``` use regex::Regex; use serde::{Deserialize, Serialize}; use strong_xml::{XmlRead, XmlWrite}; use thiserror::Error; #[derive(Debug, Error)] pub enum Error { #[error("OPML body has no <outline> elements")] BodyHasNoOutlines, #[error("Unsupported OPML version: {0:?}")] UnsupportedVersion(String), #[error("Failed to process XML file")] XmlError(#[from] strong_xml::XmlError), } /// The top-level [OPML](struct.OPML.html) element. #[derive( XmlWrite, XmlRead, PartialEq, 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](struct.Head.html) child element. Contains the metadata of the OPML document. #[xml(child = "head")] pub head: Option<Head>, /// The [Body](struct.Body.html) child element. Contains all the [Outlines](struct.Outline.html). #[xml(child = "body")] pub body: Body, } impl OPML { /// 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 parsed = OPML::new(xml).unwrap(); /// /// let mut expected = OPML::default(); /// expected.body.outlines.push(Outline { /// text: "Outline".to_string(), /// ..Outline::default() /// }); /// /// assert_eq!(parsed, expected); /// ``` pub fn new(xml: &str) -> Result<Self, Error> { let opml = OPML::from_str(xml)?; let version = &opml.version; // SPEC: The version attribute is a version string, of the form, x.y, where x and y are both numeric strings. let valid_version_regex = Regex::new(r"^\d+\.\d+$").unwrap(); let valid_versions = vec!["1.0", "1.1", "2.0"]; if !valid_version_regex.is_match(version) || !valid_versions.contains(&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) } /// Helper function to add an [Outline](struct.Outline.html) element with `text` and `xml_url` attributes to the [Body](struct.Body.html). Useful for creating feed lists quickly. This function [also exists on the Outline struct](struct.Outline.html#method.add_feed) to create grouped lists easily. /// /// # 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 } /// Converts the struct to an XML document. /// /// # Example /// /// ```rust /// use opml::OPML; /// /// let opml = OPML::default(); /// let xml = opml.to_xml().unwrap(); /// /// let expected = r#"<opml version="2.0"><head/><body/></opml>"#; /// assert_eq!(xml, expected); /// ``` pub fn to_xml(&self) -> Result<String, Error> { Ok(self.to_string()?) } } impl Default for OPML { fn default() -> Self { OPML { version: "2.0".to_string(), head: Some(Head::default()), body: Body::default(), } } } /// The [Head](struct.Head.html) child element of [OPML](struct.OPML.html). /// Contains the metadata of the OPML document. #[derive( XmlWrite, XmlRead, PartialEq, 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](struct.Body.html) child element of [OPML](struct.OPML.html). Contains all the [Outlines](struct.Outline.html). #[derive( XmlWrite, XmlRead, PartialEq, Debug, Clone, Default, Serialize, Deserialize, )] #[xml(tag = "body")] pub struct Body { /// All the top-level [Outline](struct.Outline.html) elements. #[xml(child = "outline")] pub outlines: Vec<Outline>, } /// The [Outline](struct.Outline.html) element. #[derive( XmlWrite, XmlRead, PartialEq, 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](struct.Outline.html) 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](struct.Outline.html) 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](http://cyber.law.harvard.edu/rss/rss.html#ltcategorygtSubelementOfLtitemgt) element. To represent a "tag," the category string should contain no slashes. #[xml(attr = "category")] pub category: Option<String>, /// Child [Outline](struct.Outline.html) 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](struct.Outline.html) element with `text` and `xml_url` attributes as a child element. Useful for creating grouped lists. This function [also exists on the OPML struct](struct.OPML.html#method.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 } }