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backend: add const to ast

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This commit is contained in:
Julius Rakow
2018-07-13 04:16:19 +02:00
parent 63598721ca
commit 862e4c50f6
5 changed files with 82 additions and 0 deletions
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40
crates/backend/src/codegen.rs
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@ -501,6 +501,7 @@ impl ToTokens for ast::ImportKind {
ast::ImportKind::Static(ref s) => s.to_tokens(tokens),
ast::ImportKind::Type(ref t) => t.to_tokens(tokens),
ast::ImportKind::Enum(ref e) => e.to_tokens(tokens),
ast::ImportKind::Const(ref c) => c.to_tokens(tokens),
}
}
}
@ -842,6 +843,7 @@ impl<'a> ToTokens for DescribeImport<'a> {
ast::ImportKind::Static(_) => return,
ast::ImportKind::Type(_) => return,
ast::ImportKind::Enum(_) => return,
ast::ImportKind::Const(_) => return,
};
let describe_name = format!("__wbindgen_describe_{}", f.shim);
let describe_name = Ident::new(&describe_name, Span::call_site());
@ -958,3 +960,41 @@ impl ToTokens for ast::TypeAlias {
}).to_tokens(into);
}
}
impl ToTokens for ast::Const {
fn to_tokens(&self, tokens: &mut TokenStream) {
use ast::ConstValue::*;
let vis = &self.vis;
let name = &self.name;
let interface_name = &self.interface_name;
let ty = &self.ty;
let value: TokenStream = match self.value {
BooleanLiteral(false) => quote!(false),
BooleanLiteral(true) => quote!(true),
// the actual type is unknown because of typedefs
// so we cannot use std::fxx::INFINITY
// but we can use type inference
FloatLiteral(f) if f.is_infinite() && f.is_sign_positive() => quote!(1.0 / 0.0),
FloatLiteral(f) if f.is_infinite() && f.is_sign_negative() => quote!(-1.0 / 0.0),
FloatLiteral(f) if f.is_nan() => quote!(0.0 / 0.0),
// again no suffix
// panics on +-inf, nan
FloatLiteral(f) => {
let f = Literal::f64_unsuffixed(f);
quote!(#f)
},
IntegerLiteral(i) => {
let i = Literal::i64_unsuffixed(i);
quote!(#i)
},
Null => unimplemented!(),
};
(quote! {
impl #interface_name {
#vis const #name: #ty = #value;
}
}).to_tokens(tokens);
}
}