/
lib.rs
110 lines (101 loc) · 2.76 KB
/
lib.rs
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//! This crate provides Yew's procedural macro `html!` which allows using JSX-like syntax
//! for generating html and the `Properties` derive macro for deriving the `Properties` trait
//! for components.
//!
//! The `html!` macro uses [proc_macro_hack](https://github.com/dtolnay/proc-macro-hack) in order
//! to be used in the expression position.
//!
//! ```
//! # #[macro_use] extern crate yew;
//! use yew::prelude::*;
//!
//! struct Component {
//! link: ComponentLink<Self>,
//! }
//!
//! #[derive(Clone, Properties)]
//! struct Props {
//! prop: String,
//! };
//!
//! # enum Msg { Submit }
//! #
//! # impl yew::Component for Component {
//! # type Message = Msg;
//! # type Properties = Props;
//! # fn create(_: Self::Properties, _: ComponentLink<Self>) -> Self {
//! # unimplemented!()
//! # }
//! #
//! # fn update(&mut self, msg: Self::Message) -> ShouldRender {
//! # unimplemented!()
//! # }
//! #
//! # fn change(&mut self, props: Self::Properties) -> ShouldRender {
//! # unimplemented!()
//! # }
//! #
//! # fn view(&self) -> Html {
//! #
//! // ...
//!
//! html! {
//! <div>
//! <button onclick=self.link.callback(|_| Msg::Submit)>
//! { "Submit" }
//! </button>
//! <>
//! <Component prop="first" />
//! <Component prop="second" />
//! </>
//! </div>
//! }
//! #
//! # }
//! # }
//! #
//! # fn main() {}
//! ```
//!
//! Please refer to [https://github.com/yewstack/yew](https://github.com/yewstack/yew) for how to set this up.
#![recursion_limit = "128"]
extern crate proc_macro;
mod derive_props;
mod html_tree;
use derive_props::DerivePropsInput;
use html_tree::{HtmlRoot, HtmlRootNested};
use proc_macro::TokenStream;
use proc_macro_hack::proc_macro_hack;
use quote::{quote, ToTokens};
use syn::buffer::Cursor;
use syn::parse_macro_input;
trait Peek<'a, T> {
fn peek(cursor: Cursor<'a>) -> Option<(T, Cursor<'a>)>;
}
trait PeekValue<T> {
fn peek(cursor: Cursor) -> Option<T>;
}
fn non_capitalized_ascii(string: &str) -> bool {
if !string.is_ascii() {
false
} else if let Some(c) = string.bytes().next() {
c.is_ascii_lowercase()
} else {
false
}
}
#[proc_macro_derive(Properties, attributes(prop_or, prop_or_else, prop_or_default))]
pub fn derive_props(input: TokenStream) -> TokenStream {
let input = parse_macro_input!(input as DerivePropsInput);
TokenStream::from(input.into_token_stream())
}
#[proc_macro_hack]
pub fn html_nested(input: TokenStream) -> TokenStream {
let root = parse_macro_input!(input as HtmlRootNested);
TokenStream::from(quote! {#root})
}
#[proc_macro_hack]
pub fn html(input: TokenStream) -> TokenStream {
let root = parse_macro_input!(input as HtmlRoot);
TokenStream::from(quote! {#root})
}