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Adds support for #[wasm_bindgen(typescript_custom_section)].

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This commit is contained in:
Tim Ryan
2018-11-17 23:04:19 -05:00
parent fc0d6528fc
commit 90193eab51
7 changed files with 91 additions and 5 deletions
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53
crates/macro-support/src/parser.rs
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@ -207,6 +207,13 @@ impl BindgenAttrs {
_ => false,
})
}
fn typescript_custom_section(&self) -> bool {
self.attrs.iter().any(|a| match *a {
BindgenAttr::TypescriptCustomSection => true,
_ => false,
})
}
}
impl Parse for BindgenAttrs {
@ -244,6 +251,7 @@ pub enum BindgenAttr {
Extends(syn::Path),
VendorPrefix(Ident),
Variadic,
TypescriptCustomSection,
}
impl Parse for BindgenAttr {
@ -334,6 +342,9 @@ impl Parse for BindgenAttr {
};
return Ok(BindgenAttr::JsName(val, span));
}
if attr == "typescript_custom_section" {
return Ok(BindgenAttr::TypescriptCustomSection);
}
Err(original.error("unknown attribute"))
}
@ -810,11 +821,20 @@ impl<'a> MacroParse<(Option<BindgenAttrs>, &'a mut TokenStream)> for syn::Item {
e.to_tokens(tokens);
e.macro_parse(program, ())?;
}
_ => bail_span!(
self,
"#[wasm_bindgen] can only be applied to a function, \
struct, enum, impl, or extern block"
),
syn::Item::Const(mut c) => {
let opts = match opts {
Some(opts) => opts,
None => BindgenAttrs::find(&mut c.attrs)?,
};
c.macro_parse(program, opts)?;
}
_ => {
bail_span!(
self,
"#[wasm_bindgen] can only be applied to a function, \
struct, enum, impl, or extern block",
);
}
}
Ok(())
@ -992,6 +1012,29 @@ impl MacroParse<()> for syn::ItemEnum {
}
}
impl MacroParse<BindgenAttrs> for syn::ItemConst {
fn macro_parse(self, program: &mut ast::Program, opts: BindgenAttrs) -> Result<(), Diagnostic> {
// Shortcut
if !opts.typescript_custom_section() {
bail_span!(self, "#[wasm_bindgen] will not work on constants unless you are defining a #[wasm_bindgen(typescript_custom_section)].");
}
match *self.expr {
syn::Expr::Lit(syn::ExprLit {
lit: syn::Lit::Str(litstr),
..
}) => {
program.typescript_custom_sections.push(litstr.value());
},
_ => {
bail_span!(self, "Expected a string literal to be used with #[wasm_bindgen(typescript_custom_section)].");
},
}
Ok(())
}
}
impl MacroParse<BindgenAttrs> for syn::ItemForeignMod {
fn macro_parse(self, program: &mut ast::Program, opts: BindgenAttrs) -> Result<(), Diagnostic> {
let mut errors = Vec::new();