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Temporary fix for serde issue (#1511)

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* Generate serde bound instead of relying on serde_derive.

* remove comment
This commit is contained in:
cheme
2019-01-21 19:23:22 +01:00
committed by Gav Wood
parent 7ccd294de4
commit 8ec759d32e
3 changed files with 89 additions and 1 deletions
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substrate/srml/support/procedural/tools/src/syn_ext.rs
+54
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@@ -334,3 +334,57 @@ pub fn has_parametric_type_def(typ: &syn::Type, ident: &Ident, default: bool) ->
pub fn has_parametric_type(typ: &syn::Type, ident: &Ident) -> bool {
has_parametric_type_def(typ, ident, true)
}
/// Get case where serde does not include bound with serde_derive macros:
/// see https://github.com/serde-rs/serde/issues/1454
pub fn get_non_bound_serde_derive_types(typ: &syn::Type, t: &syn::Ident) -> Vec<syn::Type> {
let mut result = Vec::new();
get_non_bound_serde_derive_types_inner(typ, t, &mut result);
result
}
fn get_non_bound_serde_derive_types_inner(typ: &syn::Type, t: &syn::Ident, result: &mut Vec<syn::Type>) {
match *typ {
syn::Type::Path(ref path) => {
if heuristic_is_associated_path(&path.path,t) {
result.push(typ.clone());
}
for p in path.path.segments.iter() {
if let syn::PathArguments::AngleBracketed(ref args) = p.arguments {
for a in args.args.iter() {
if let syn::GenericArgument::Type(ref ty) = a {
get_non_bound_serde_derive_types_inner(ty, t, result)
}
}
}
}
},
syn::Type::Slice(ref inner) => get_non_bound_serde_derive_types_inner(&inner.elem, t, result),
syn::Type::Array(ref inner) => get_non_bound_serde_derive_types_inner(&inner.elem, t, result),
syn::Type::Ptr(ref inner) => get_non_bound_serde_derive_types_inner(&inner.elem, t, result),
syn::Type::Reference(ref inner) => get_non_bound_serde_derive_types_inner(&inner.elem, t, result),
syn::Type::BareFn(..) => (),
syn::Type::Never(..) => (),
syn::Type::Tuple(ref inner) => for e in inner.elems.iter() {
get_non_bound_serde_derive_types_inner(e, t, result)
},
syn::Type::TraitObject(..) => (),
syn::Type::ImplTrait(..) => (),
syn::Type::Paren(ref inner) => get_non_bound_serde_derive_types_inner(&inner.elem, t, result),
syn::Type::Group(ref inner) => get_non_bound_serde_derive_types_inner(&inner.elem, t, result),
syn::Type::Infer(..) => (),
syn::Type::Macro(..) => (),
syn::Type::Verbatim(..) => (),
}
}
fn heuristic_is_associated_path(path: &syn::Path,t: &syn::Ident) -> bool {
if let Some(syn::punctuated::Pair::Punctuated(s,_)) = path.segments.first() {
&s.ident == t
} else {
false
}
}