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Code Issues Releases Wiki Activity

improve span handling a bit

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This commit is contained in:
Robin Appelman 2019-02-28 17:28:37 +01:00
commit f96f44a590
1 changed files with 11 additions and 8 deletions
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19
bitstream_reader_derive/src/lib.rs
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@ -5,7 +5,7 @@
//! # Examples
//!
//! ```
//! use bitstream_reader_derive::Read;
//! use bitstream_reader_derive::BitRead;
//!
//! #[derive(BitRead)]
//! struct TestStruct {
@ -86,15 +86,16 @@ fn parse(data: &Data, struct_name: &Ident) -> TokenStream {
// Get attributes `#[..]` on each field
let size = get_field_size(f);
let field_type = &f.ty;
let span = f.span();
match size {
Some(size) => {
quote_spanned! { f.span() =>
quote_spanned! {span=>
let size: usize = #size;
let #name:#field_type = stream.read_sized(size)?;
}
}
None => {
quote_spanned! { f.span() =>
quote_spanned! {span=>
let #name:#field_type = stream.read()?;
}
}
@ -102,11 +103,12 @@ fn parse(data: &Data, struct_name: &Ident) -> TokenStream {
});
let struct_definition = fields.named.iter().map(|f| {
let name = &f.ident;
quote_spanned! { f.span() =>
quote_spanned! {f.span()=>
#name,
}
});
quote! {
let span = data.struct_token.span();
quote_spanned! {span=>
#(#definitions)*
Ok(#struct_name {
@ -122,16 +124,17 @@ fn parse(data: &Data, struct_name: &Ident) -> TokenStream {
}
fn get_field_size(field: &Field) -> Option<TokenStream> {
let span = field.span();
get_field_attr(field, "size")
.map(|size_lit| match size_lit {
Lit::Int(size) => {
quote! {
quote_spanned! {span=>
#size
}
}
Lit::Str(size_field) => {
let size = Ident::new(&size_field.value(), Span::call_site());
quote! {
quote_spanned! {span=>
#size as usize
}
}
@ -139,7 +142,7 @@ fn get_field_size(field: &Field) -> Option<TokenStream> {
})
.or_else(|| {
get_field_attr(field, "size_bits").map(|size_bits_lit| {
quote_spanned! { field.span() =>
quote_spanned! {span=>
stream.read_int::<usize>(#size_bits_lit)?
}
})