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Add support for optional chars

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Anton Danilkin
2018-08-03 20:45:57 +03:00
committed by Alex Crichton
parent 4a0c69ffed
commit afaf94a428
5 changed files with 85 additions and 0 deletions
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21
crates/cli-support/src/js/js2rust.rs
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@ -277,6 +277,13 @@ impl<'a, 'b> Js2Rust<'a, 'b> {
self.rust_arguments.push(format!("isLikeNone({0}) ? 0xFFFFFF : {0} ? 1 : 0", name));
return Ok(self);
},
Descriptor::Char => {
self.cx.expose_is_like_none();
self.js_arguments.push((name.clone(), "string".to_string()));
self.rust_arguments.push(format!("!isLikeNone({0})", name));
self.rust_arguments.push(format!("isLikeNone({0}) ? 0 : {0}.codePointAt(0)", name));
return Ok(self);
},
_ => bail!("unsupported optional argument type for calling Rust function from JS: {:?}", arg),
};
}
@ -514,6 +521,20 @@ impl<'a, 'b> Js2Rust<'a, 'b> {
".to_string();
return Ok(self);
},
Descriptor::Char => {
self.ret_ty = "string".to_string();
self.cx.expose_global_argument_ptr()?;
self.cx.expose_uint32_memory();
self.prelude("const retptr = globalArgumentPtr();");
self.rust_arguments.insert(0, "retptr".to_string());
self.ret_expr = "
RET;
const present = getUint32Memory()[retptr / 4];
const value = getUint32Memory()[retptr / 4 + 1];
return present === 0 ? undefined : String.fromCodePoint(value);
".to_string();
return Ok(self);
},
_ => bail!("unsupported optional return type for calling Rust function from JS: {:?}", ty),
};
}