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c35d6f4b0a
Reported in #1191 the fix requires us to get a bit creative I think. The general gist is that a block like this: #[wasm_bindgen] impl Foo { pub fn foo() {} } was previously expanded all in one go. Now, however, it's expanded into: impl Foo { #[__wasm_bindgen_class_marker(Foo = "Foo")] pub fn foo() {} } // goop generated by orginal #[wasm_bindgen] This method of expansion takes advantage of rustc's recursive expansion feature. It also allows us to expand `impl` blocks and allow inner items to not be fully expanded yet, such as still having `#[cfg]` attributes (like in the original bug report). We use theinternal `__wasm_bindgen_class_marker` to indicate that we're parsing an `ImplItemMethod` unconditionally, and then generation proceeds as usual. The only final catch is that when we're expanding in an `impl` block we have to generate tokens for the `Program` (wasm-bindgen injected goop like the custom section) inside the body of the function itself instead of next to it. Otherwise we'd get syntax errors inside of impl blocks! Closes #1191 |
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| Cargo.toml | ||
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| README.md | ||
wasm-bindgen-macro
Implementation of the #[wasm_bindgen] attribute. See the wasm-bindgen
documentation for more information about what this macro does.
Testing
Testing of this macro is done through "ui tests" in the ui-tests subdirectory
of this crate. Each Rust file in this folder is compiled with the wasm_bindgen
crate, and the *.stderr file sitting next to it is the asserted output of the
compiler. If the output matches, the test passes, and if the output doesn't
match the test fails. Note that it is also considered a failure if a test
actually compiles successfully.
To add a test:
- Create
ui-tests/my-awesome-test.rs - Write an invalid
#[wasm_bindgen]invocation, testing the error you're generating - Execute
cargo test -p ui-tests, the test will fail - From within the
ui-testsfolder, execute./update-all-references.sh. This should create amy-awesome-test.stderrfile. - Inspect
my-awesome-test.stderrto make sure it looks ok - Rerun
cargo test -p ui-testsand your tests should pass!
Testing here is a work in progress, see #601 for more information.