mirror of
https://github.com/fluencelabs/wasm-bindgen
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c8a352189b
This commit implements a system that will assert that all `#[wasm_bindgen]` attributes are actually used during compilation. This should help ensure that we don't sneak in stray attributes that don't actually end up having any meaning, and hopefully make it a bit easier to learn `#[wasm_bindgen]`!
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
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//! not in the shared backend crate.
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#![doc(html_root_url = "https://docs.rs/wasm-bindgen-macro-support/0.2")]
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extern crate proc_macro2;
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extern crate quote;
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#[macro_use]
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extern crate syn;
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#[macro_use]
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extern crate wasm_bindgen_backend as backend;
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extern crate wasm_bindgen_shared as shared;
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use backend::{Diagnostic, TryToTokens};
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pub use parser::BindgenAttrs;
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use parser::MacroParse;
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use proc_macro2::TokenStream;
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mod parser;
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/// Takes the parsed input from a `#[wasm_bindgen]` macro and returns the generated bindings
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pub fn expand(attr: TokenStream, input: TokenStream) -> Result<TokenStream, Diagnostic> {
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parser::reset_attrs_used();
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let item = syn::parse2::<syn::Item>(input)?;
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let opts = syn::parse2(attr)?;
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let mut tokens = proc_macro2::TokenStream::new();
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let mut program = backend::ast::Program::default();
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item.macro_parse(&mut program, (Some(opts), &mut tokens))?;
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program.try_to_tokens(&mut tokens)?;
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// If we successfully got here then we should have used up all attributes
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// and considered all of them to see if they were used. If one was forgotten
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// that's a bug on our end, so sanity check here.
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parser::assert_all_attrs_checked();
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Ok(tokens)
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}
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