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Support Option with custom enums in JS

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Find a hole automatically to use a sentinel value for `None`, and then
just wire everything up!

Closes #1198
This commit is contained in:
Alex Crichton
2019-01-28 14:12:02 -08:00
parent 03e52c7045
commit 9224455077
8 changed files with 119 additions and 5 deletions
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6
crates/cli-support/src/descriptor.rs
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@ -59,7 +59,7 @@ pub enum Descriptor {
Vector(Box<Descriptor>),
String,
Anyref,
Enum,
Enum { hole: u32 },
RustStruct(String),
Char,
Option(Box<Descriptor>),
@ -128,7 +128,7 @@ impl Descriptor {
OPTIONAL => Descriptor::Option(Box::new(Descriptor::_decode(data))),
STRING => Descriptor::String,
ANYREF => Descriptor::Anyref,
ENUM => Descriptor::Enum,
ENUM => Descriptor::Enum { hole: get(data) },
RUST_STRUCT => {
let name = (0..get(data))
.map(|_| char::from_u32(get(data)).unwrap())
@ -159,7 +159,7 @@ impl Descriptor {
| Descriptor::U32
| Descriptor::F32
| Descriptor::F64
| Descriptor::Enum => true,
| Descriptor::Enum { .. } => true,
_ => return false,
}
}