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Backend refactor (#411)

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* remove BindgenAttrs from other backend::ast structs

This is primarily a tool for use with the macro crate. Most of
these attributes were ignored in the actual codegen, but a few
were still being used. This is confusing when trying to add
other sources for codegen (such as webidl and typescript).

* move parsing logic to macro crate

This makes the backend crate solely concerned with having an ast
for which we can generate code.
This commit is contained in:
R. Andrew Ohana
2018-07-07 10:20:31 -07:00
committed by Alex Crichton
parent 056b45aeed
commit 2d50d5209b
10 changed files with 1095 additions and 1053 deletions
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12
crates/macro/src/lib.rs
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@ -3,21 +3,27 @@
extern crate proc_macro;
extern crate proc_macro2;
extern crate quote;
extern crate wasm_bindgen_shared as shared;
#[macro_use]
extern crate syn;
extern crate wasm_bindgen_backend as backend;
use proc_macro::TokenStream;
use quote::ToTokens;
mod parser;
use parser::MacroParse;
#[proc_macro_attribute]
pub fn wasm_bindgen(attr: TokenStream, input: TokenStream) -> TokenStream {
let item = syn::parse::<syn::Item>(input.clone()).expect("expected a valid Rust item");
let opts = syn::parse::<backend::ast::BindgenAttrs>(attr)
.expect("invalid arguments to #[wasm_bindgen]");
let opts =
syn::parse::<parser::BindgenAttrs>(attr).expect("invalid arguments to #[wasm_bindgen]");
let mut ret = proc_macro2::TokenStream::new();
let mut program = backend::ast::Program::default();
program.push_item(item, Some(opts), &mut ret);
item.macro_parse(&mut program, (Some(opts), &mut ret));
program.to_tokens(&mut ret);
if cfg!(feature = "xxx_debug_only_print_generated_code") {