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Disallow both structural and host_binding

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This commit is contained in:
Alex Crichton
2018-11-08 16:47:46 -08:00
parent 4c42aba007
commit 8ba467e905
3 changed files with 32 additions and 8 deletions
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21
crates/macro-support/src/parser.rs
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@ -150,11 +150,11 @@ impl BindgenAttrs {
}
/// Whether the `host_binding` attribute is present
fn host_binding(&self) -> bool {
self.attrs.iter().any(|a| match *a {
BindgenAttr::HostBinding => true,
_ => false,
})
fn host_binding(&self) -> Option<&Ident> {
self.attrs.iter().filter_map(|a| match a {
BindgenAttr::HostBinding(i) => Some(i),
_ => None,
}).next()
}
/// Whether the readonly attributes is present
@ -237,7 +237,7 @@ pub enum BindgenAttr {
IndexingSetter,
IndexingDeleter,
Structural,
HostBinding,
HostBinding(Ident),
Readonly,
JsName(String, Span),
JsClass(String),
@ -272,7 +272,7 @@ impl Parse for BindgenAttr {
return Ok(BindgenAttr::Structural);
}
if attr == "host_binding" {
return Ok(BindgenAttr::HostBinding);
return Ok(BindgenAttr::HostBinding(attr))
}
if attr == "readonly" {
return Ok(BindgenAttr::Readonly);
@ -555,13 +555,18 @@ impl<'a> ConvertToAst<(BindgenAttrs, &'a Option<String>)> for syn::ForeignItemFn
ShortHash(data)
)
};
if let Some(ident) = opts.host_binding() {
if opts.structural() {
bail_span!(ident, "cannot specify both `structural` and `host_binding`");
}
}
Ok(ast::ImportKind::Function(ast::ImportFunction {
function: wasm,
kind,
js_ret,
catch,
variadic,
structural: opts.structural() || !opts.host_binding(),
structural: opts.structural() || opts.host_binding().is_none(),
rust_name: self.ident.clone(),
shim: Ident::new(&shim, Span::call_site()),
doc_comment: None,