mirror of
https://github.com/fluencelabs/wasm-bindgen
synced 2025-04-22 04:32:13 +00:00
bdec2582aa
* Make ConvertToAst trait fallible It's got some panics, and we'll be switching those to errors! * First example of a diagnostic-driven error Add a diagnostic-driven error `#[wasm_bindgen]` being attached to public functions, and add some macros to boot to make it easier to generate errors! * Result-ify `src/parser.rs` This commit converts all of `src/parser.rs` away from panics to using `Diagnostic` instead. Along the way this adds a test case per changed `panic!`, ensuring that we don't regress in these areas!
39 lines
1.3 KiB
Rust
39 lines
1.3 KiB
Rust
//! This crate contains the part of the implementation of the `#[wasm_bindgen]` optsibute that is
|
|
//! not in the shared backend crate.
|
|
|
|
#![doc(html_root_url = "https://docs.rs/wasm-bindgen-macro-support/0.2")]
|
|
|
|
extern crate proc_macro2;
|
|
extern crate quote;
|
|
#[macro_use]
|
|
extern crate syn;
|
|
#[macro_use]
|
|
extern crate wasm_bindgen_backend as backend;
|
|
extern crate wasm_bindgen_shared as shared;
|
|
|
|
pub use parser::BindgenAttrs;
|
|
use parser::MacroParse;
|
|
use backend::{Diagnostic, TryToTokens};
|
|
use proc_macro2::TokenStream;
|
|
|
|
mod parser;
|
|
|
|
/// Takes the parsed input from a `#[wasm_bindgen]` macro and returns the generated bindings
|
|
pub fn expand(attr: TokenStream, input: TokenStream) -> Result<TokenStream, Diagnostic> {
|
|
let item = syn_parse::<syn::Item>(input, "rust item")?;
|
|
let opts = syn_parse(attr, "#[wasm_bindgen] attribute options")?;
|
|
|
|
let mut tokens = proc_macro2::TokenStream::new();
|
|
let mut program = backend::ast::Program::default();
|
|
item.macro_parse(&mut program, (Some(opts), &mut tokens))?;
|
|
program.try_to_tokens(&mut tokens)?;
|
|
Ok(tokens)
|
|
}
|
|
|
|
fn syn_parse<T: syn::synom::Synom>(tokens: TokenStream, name: &str) -> Result<T, Diagnostic> {
|
|
syn::parse2(tokens.clone())
|
|
.map_err(|err| {
|
|
Diagnostic::span_error(&tokens, format!("error parsing {}: {}", name, err))
|
|
})
|
|
}
|