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//! ## unhtml_derive //! //! [](https://travis-ci.org/Hexilee/unhtml.rs) //! [](https://crates.io/crates/unhtml_derive) //! [](https://github.com/Hexilee/unhtml.rs/blob/master/LICENSE) //! [](https://docs.rs/unhtml_derive) //! //! derive for crate unhtml [](https://crates.io/crates/unhtml) //! //! ---------------- //! //! Table of Contents //! ================= //! //! * [Derive Target](#derive-target) //! * [Basic Usage](#basic-usage) //! * [Attributes](#attributes) //! * [html](#html) //! * [target](#target) //! * [specification](#specification) //! * [selector](#selector) //! * [target](#target-1) //! * [literal type](#literal-type) //! * [specification](#specification-1) //! * [default behavior](#default-behavior) //! * [attr](#attr) //! * [target](#target-2) //! * [literal type](#literal-type-1) //! * [specification](#specification-2) //! * [default behavior](#default-behavior-1) //! * [default](#default) //! * [target](#target-3) //! * [literal type](#literal-type-2) //! * [specification](#specification-3) //! * [default behavior](#default-behavior-2) //! * [Field Type](#field-type) //! * [any type implemented FromHtml, without generics](#any-type-implemented-fromhtml-without-generics) //! * [Vec](#vec) //! * [Source HTML](#source-html) //! * [with top selector](#with-top-selector) //! * [without top selector](#without-top-selector) //! //! ### Derive Target //! //! `struct` //! //! ### Basic Usage //! //! ```rust,ignore //! #[macro_use] //! extern crate unhtml_derive; //! extern crate unhtml; //! use unhtml::{self, FromHtml}; //! //! #[derive(FromHtml)] //! #[html(selector = "#test")] //! struct SingleUser { //! #[html(selector = "p:nth-child(1)", attr = "inner")] //! name: String, //! //! #[html(selector = "p:nth-child(2)", attr = "inner")] //! age: u8, //! //! #[html(selector = "p:nth-child(3)", attr = "inner")] //! like_lemon: bool, //! } //! //! let user = SingleUser::from_html(r#"<!DOCTYPE html> //! <html lang="en"> //! <head> //! <meta charset="UTF-8"> //! <title>Title</title> //! </head> //! <body> //! <div id="test"> //! <div> //! <p>Hexilee</p> //! <p>20</p> //! <p>true</p> //! </div> //! </div> //! </body> //! </html>"#).unwrap(); //! assert_eq!("Hexilee", &user.name); //! assert_eq!(20, user.age); //! assert!(user.like_lemon); //! ``` //! //! ### Attributes //! #### html //! //! ##### target //! //! `derive target` or `field` //! //! ##### specification //! //! //! `#[html(selector = "...", attr = "...", default = ...)]` //! //! `selector`, `attr`, `default` or `html` itself can be unnecessary. //! //! This is valid //! //! ```rust,ignore //! #[macro_use] //! extern crate unhtml_derive; //! extern crate unhtml; //! use unhtml::{self, FromHtml}; //! //! //! #[derive(FromHtml)] //! struct SingleString { //! value: String, //! } //! ``` //! //! //! #### selector //! //! ##### target //! //! `derive target` or `field` //! //! //! ##### literal type //! //! `string` //! //! ##### specification //! //! selector must be a valid css-selector, invalid selector will cause a compile-time panic //! //! ```rust,ignore //! // panic //! #[macro_use] //! extern crate unhtml_derive; //! extern crate unhtml; //! use unhtml::{self, FromHtml}; //! //! #[derive(FromHtml)] //! #[html(selector = "<>")] //! struct SingleUser {} //! ``` //! //! ```rust,ignore //! // panic //! #[macro_use] //! extern crate unhtml_derive; //! extern crate unhtml; //! use unhtml::*; //! //! #[derive(FromHtml)] //! struct SingleUser { //! #[html(selector = "<>", attr = "inner")] //! name: String, //! } //! ``` //! //! if multi element is selected and field type is not `Vec`, the first will be chosen //! //! ```rust,ignore //! //! #[macro_use] //! extern crate unhtml_derive; //! extern crate unhtml; //! use unhtml::{self, FromHtml}; //! //! #[derive(FromHtml)] //! #[html(selector = "a")] //! struct Link { //! #[html(attr = "href")] //! href: String, //! //! #[html(attr = "inner")] //! value: String, //! } //! //! let link = Link::from_html(r#" //! <a href="https://github.com">Github</a> //! <a href="https://google.com">Google</a> //! "#).unwrap(); //! assert_eq!("https://github.com", &link.href); //! assert_eq!("Github", &link.value); //! ``` //! //! //! ##### default behavior //! //! html of its root element //! //! ```rust,ignore //! //! #[macro_use] //! extern crate unhtml_derive; //! extern crate unhtml; //! use unhtml::{self, FromHtml}; //! //! #[derive(FromHtml)] //! #[html(selector = "a")] //! struct Link { //! #[html(attr = "href")] //! href: String, //! //! #[html(attr = "inner")] //! value: String, //! } //! //! let link = Link::from_html(r#"<a href="https://github.com">Github</a>"#).unwrap(); //! assert_eq!("https://github.com", &link.href); //! assert_eq!("Github", &link.value); //! ``` //! //! //! #### attr //! //! ##### target //! //! `field` //! //! //! ##### literal type //! //! `string` //! //! ##### specification //! //! - `value` refer to `innerHtml` //! - any other `attr` refer to `html element attribute` //! //! ```rust,ignore //! #[macro_use] //! extern crate unhtml_derive; //! extern crate unhtml; //! use unhtml::{self, FromHtml}; //! //! #[derive(FromHtml)] //! #[html(selector = "a")] //! struct Link { //! #[html(attr = "href")] //! href: String, //! //! #[html(attr = "inner")] //! value: String, //! } //! //! let link = Link::from_html(r#"<a href="https://github.com">Github</a>"#).unwrap(); //! assert_eq!("https://github.com", &link.href); //! assert_eq!("Github", &link.value); //! ``` //! //! ##### default behavior //! //! html of the whole element (not `innerHtml`!) //! //! ```rust,ignore //! #[macro_use] //! extern crate unhtml_derive; //! extern crate unhtml; //! use unhtml::{self, FromHtml}; //! //! #[derive(FromHtml)] //! #[html(selector = "a")] //! struct Link { //! #[html(attr = "href")] //! href: String, //! //! #[html(attr = "inner")] //! value: String, //! //! source: String, //! } //! //! let link = Link::from_html(r#"<a href="https://github.com">Github</a>"#).unwrap(); //! assert_eq!("https://github.com", &link.href); //! assert_eq!("Github", &link.value); //! assert_eq!(r#"<a href="https://github.com">Github</a>"#, &link.source); //! ``` //! //! #### default //! //! ##### target //! //! `field` //! //! ##### literal type //! //! any `literal type` //! //! ##### specification //! //! - the same type with `field` //! //! ```rust,ignore //! #[macro_use] //! extern crate unhtml_derive; //! extern crate unhtml; //! use unhtml::{self, FromHtml}; //! //! #[derive(FromHtml)] //! struct DefaultUser { //! // invoke String::from_html //! #[html(selector = "#non-exist", default = "Hexilee")] //! name: String, //! //! // invoke u8::from<u8> //! #[html(default = 20)] //! age: u8, //! //! #[html(default = true)] //! like_lemon: bool, //! } //! //! let user = DefaultUser::from_html("<p></p>").unwrap(); //! assert_eq!("Hexilee", &user.name); //! assert_eq!(20, user.age); //! assert_eq!(-1000, user.assets); //! assert!(user.like_lemon); //! ``` //! //! - `string` //! //! ```rust,ignore //! #[macro_use] //! extern crate unhtml_derive; //! extern crate unhtml; //! use unhtml::{self, FromHtml}; //! //! #[derive(FromHtml)] //! #[html(selector = "a")] //! struct Link { //! #[html(attr = "href")] //! href: String, //! //! #[html(attr = "inner")] //! value: String, //! } //! //! #[derive(FromHtml)] //! struct Website { //! #[html(default = "10")] //! age: u8, //! //! #[html(default = "<a href='https://github.com'>Github</a>")] //! link: Link, //! } //! //! let website = Website::from_html("<p></p>").unwrap(); //! let link = website.link; //! assert_eq!(10u8, website.age); //! assert_eq!("https://github.com", &link.href); //! assert_eq!("Github", &link.value); //! ``` //! //! ##### default behavior //! //! return a Err(unhtml::failure::Error) when selected nothing //! //! ```rust,ignore //! // panic //! #[macro_use] //! extern crate unhtml_derive; //! extern crate unhtml; //! use unhtml::{self, FromHtml}; //! //! #[derive(FromHtml)] //! #[html(selector = "a")] //! struct Link { //! // no default //! #[html(attr = "href")] //! href: String, //! //! #[html(attr = "inner")] //! value: String, //! } //! //! let link = Link::from_html(r#"<a>Github</a>"#).unwrap(); //! ``` //! //! ### Field Type //! //! ##### any type implemented FromHtml, without generics //! //! ```rust,ignore //! // panic //! #[macro_use] //! extern crate unhtml_derive; //! extern crate unhtml; //! use unhtml::{self, FromHtml}; //! //! #[derive(FromHtml)] //! #[html(selector = "a")] //! struct Link { //! // no default //! #[html(attr = "href")] //! href: &str, //! } //! ``` //! //! ```rust,ignore //! // panic //! #[macro_use] //! extern crate unhtml_derive; //! extern crate unhtml; //! use unhtml::{self, FromHtml}; //! //! #[derive(FromHtml)] //! struct Website { //! // no default //! #[html(attr = "href")] //! hrefs: std::collections::LinkedList<String>, //! } //! ``` //! //! ```rust,ignore //! // panic //! #[macro_use] //! extern crate unhtml_derive; //! extern crate unhtml; //! use unhtml::{self, FromHtml}; //! //! #[derive(FromHtml)] //! struct Website { //! // no default //! #[html(attr = "href")] //! hrefs: [String], //! } //! ``` //! //! ##### Vec //! //! > Should `use unhtml::VecFromHtml` //! //! ```rust,ignore //! extern crate unhtml_derive; //! extern crate unhtml; //! use unhtml::{self, FromHtml, VecFromHtml}; //! //! #[derive(FromHtml)] //! struct TestUser { //! #[html(selector = "p:nth-child(1)", attr = "inner")] //! name: String, //! //! #[html(selector = "p:nth-child(2)", attr = "inner")] //! age: u8, //! //! #[html(selector = "p:nth-child(3)", attr = "inner")] //! like_lemon: bool, //! } //! //! #[derive(FromHtml)] //! #[html(selector = "#test")] //! struct TestUsers { //! #[html(selector = "div")] //! users: Vec<TestUser>, //! } //! //! let users = TestUsers::from_html(r#"<!DOCTYPE html> //! <html lang="en"> //! <head> //! <meta charset="UTF-8"> //! <title>Title</title> //! </head> //! <body> //! <div id="test"> //! <div> //! <p>Hexilee</p> //! <p>20</p> //! <p>true</p> //! </div> //! <div> //! <p>BigBrother</p> //! <p>21</p> //! <p>false</p> //! </div> //! </div> //! </body> //! </html>"#).unwrap(); //! let hexilee = &users.users[0]; //! let big_brother = &users.users[1]; //! assert_eq!("Hexilee", &hexilee.name); //! assert_eq!(20, hexilee.age); //! assert!(hexilee.like_lemon); //! assert_eq!("BigBrother", &big_brother.name); //! assert_eq!(21, big_brother.age); //! assert!(!big_brother.like_lemon); //! ``` //! //! as the documentation of crate `unhtml`, if you want `Vec<TestUser>` straightly, you can just: //! //! //! ```rust,ignore //! extern crate unhtml_derive; //! extern crate unhtml; //! use unhtml::{self, VecFromHtml}; //! //! #[derive(FromHtml)] //! struct TestUser { //! #[html(selector = "p:nth-child(1)", attr = "inner")] //! name: String, //! //! #[html(selector = "p:nth-child(2)", attr = "inner")] //! age: u8, //! //! #[html(selector = "p:nth-child(3)", attr = "inner")] //! like_lemon: bool, //! } //! //! let users = Vec::<TestUser>::from_html("#test > div", r#"<!DOCTYPE html> //! <html lang="en"> //! <head> //! <meta charset="UTF-8"> //! <title>Title</title> //! </head> //! <body> //! <div id="test"> //! <div> //! <p>Hexilee</p> //! <p>20</p> //! <p>true</p> //! </div> //! <div> //! <p>BigBrother</p> //! <p>21</p> //! <p>false</p> //! </div> //! </div> //! </body> //! </html>"#).unwrap(); //! let hexilee = &users[0]; //! let big_brother = &users[1]; //! assert_eq!("Hexilee", &hexilee.name); //! assert_eq!(20, hexilee.age); //! assert!(hexilee.like_lemon); //! assert_eq!("BigBrother", &big_brother.name); //! assert_eq!(21, big_brother.age); //! assert!(!big_brother.like_lemon); //! ``` //! //! ### Source HTML //! //! ##### with top selector //! all source html will be parsed as `fragment`. The top element is `html` and there is no `DOCTYPE`, `head` or `body`. //! //! ```html //! <!DOCTYPE html> //! <html lang="en"> //! <head> //! <meta charset="UTF-8"> //! <title>Title</title> //! </head> //! <body> //! <div id="test"> //! <div> //! <p>Hexilee</p> //! <p>20</p> //! <p>true</p> //! </div> //! </div> //! </body> //! </html> //! ``` //! //! will be parsed as: //! //! ```html //! <html lang="en"> //! <meta charset="UTF-8"> //! <title>Title</title> //! <div id="test"> //! <div> //! <p>Hexilee</p> //! <p>20</p> //! <p>true</p> //! </div> //! </div> //! </html> //! ``` //! //! and //! //! ```html //! <p>Hexilee</p> //! ``` //! //! will be parsed as: //! //! ```html //! <html> //! <p>Hexilee</p> //! </html> //! ``` //! //! ```rust,ignore //! //! // panic //! //! extern crate unhtml_derive; //! extern crate unhtml; //! use unhtml::{self, FromHtml}; //! //! #[derive(FromHtml)] //! struct Document { //! // no default //! #[html(selector = "head")] //! head: String, //! //! #[html(selector = "body")] //! body: String, //! } //! //! let dicument = Document::from_html(r#"<!DOCTYPE html> //! <html lang="en"> //! <head> //! <meta charset="UTF-8"> //! <title>Title</title> //! </head> //! <body> //! <div id="test"> //! <div> //! <p>Hexilee</p> //! <p>20</p> //! <p>true</p> //! </div> //! </div> //! </body> //! </html>"#).unwrap(); //! ``` //! //! ##### without top selector //! //! when derived struct doesn't have `top selector`, all source html will be parsed as `pure fragment`. There is no `DOCTYPE`, `html`, `head` or `body`. //! //! ```html //! <!DOCTYPE html> //! <html lang="en"> //! <head> //! <meta charset="UTF-8"> //! <title>Title</title> //! </head> //! <body> //! <div id="test"> //! <div> //! <p>Hexilee</p> //! <p>20</p> //! <p>true</p> //! </div> //! </div> //! </body> //! </html> //! ``` //! //! will be parsed as: //! //! ```html //! <meta charset="UTF-8"> //! <title>Title</title> //! <div id="test"> //! <div> //! <p>Hexilee</p> //! <p>20</p> //! <p>true</p> //! </div> //! </div> //! ``` //! //! and //! //! ```html //! <p>Hexilee</p> //! ``` //! //! will be parsed as: //! //! ```html //! <p>Hexilee</p> //! ``` //! //! ```rust,ignore //! #[macro_use] //! extern crate unhtml_derive; //! extern crate unhtml; //! use unhtml::{self, FromHtml}; //! //! #[derive(FromHtml)] //! #[html(selector = "a")] //! struct Link { //! #[html(attr = "href")] //! href: String, //! //! #[html(attr = "inner")] //! value: String, //! } //! //! let link = Link::from_html(r#"<a href="https://github.com">Github</a>"#).unwrap(); //! assert_eq!("https://github.com", &link.href); //! assert_eq!("Github", &link.value); //! ``` extern crate proc_macro; mod attr_meta; mod html; mod text; use proc_macro::TokenStream; #[proc_macro_derive(FromHtml, attributes(html))] pub fn html_derive(input: TokenStream) -> TokenStream { html::derive(input) .unwrap_or_else(|err| err.to_compile_error()) .into() } #[proc_macro_derive(FromText)] pub fn text_derive(input: TokenStream) -> TokenStream { text::derive(input) .unwrap_or_else(|err| err.to_compile_error()) .into() }