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Remove support for non-object unions, add more comments

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This commit is contained in:
Anton Danilkin 2018-09-05 18:15:02 +03:00
parent fcd890a70e
commit e5f382eccf
1 changed files with 7 additions and 20 deletions
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27
crates/webidl/src/idl_type.rs
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@ -469,24 +469,7 @@ impl<'a> IdlType<'a> {
},
IdlType::Enum(name) => Some(ident_ty(rust_ident(camel_case_ident(name).as_str()))),
IdlType::Nullable(idl_type) => {
match **idl_type {
IdlType::Union(ref idl_types) =>
if idl_types
.iter()
.all(|idl_type|
match idl_type {
IdlType::Interface(..) => true,
_ => false,
}
) {
IdlType::Nullable(Box::new(IdlType::Object)).to_syn_type(pos)
} else {
IdlType::Any.to_syn_type(pos)
},
_ => Some(option_ty(idl_type.to_syn_type(pos)?))
}
},
IdlType::Nullable(idl_type) => Some(option_ty(idl_type.to_syn_type(pos)?)),
IdlType::FrozenArray(_idl_type) => None,
IdlType::Sequence(_idl_type) => None,
IdlType::Promise(_idl_type) => {
@ -501,8 +484,12 @@ impl<'a> IdlType<'a> {
IdlType::Record(_idl_type_from, _idl_type_to) => None,
IdlType::Union(idl_types) => {
// Handles union types in all places except operation argument types.
// Currently treats them as object or any types.
// Currently treats them as object type, if possible.
// TODO: add better support for union types here?
// Approaches for it:
// 1. Use strategy of finding the nearest common subclass (finding the best type
// that is suitable for all values of this union)
// 2. Generate enum with payload in Rust for each union type
if idl_types
.iter()
.all(|idl_type|
@ -513,7 +500,7 @@ impl<'a> IdlType<'a> {
) {
IdlType::Object.to_syn_type(pos)
} else {
IdlType::Any.to_syn_type(pos)
None
}
},