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Implement readonly struct fields

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Add support for `#[wasm_bindgen(readonly)]` which indicates that an exported
struct field is readonly and attempting to set it in JS will throw an exception.

Closes #151
This commit is contained in:
Alex Crichton
2018-04-20 10:56:10 -07:00
parent 3b4bf475be
commit 7108206835
6 changed files with 103 additions and 22 deletions
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25
crates/cli-support/src/js/mod.rs
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@ -32,14 +32,15 @@ pub struct Context<'a> {
#[derive(Default)]
pub struct ExportedClass {
pub contents: String,
pub typescript: String,
pub constructor: Option<String>,
pub fields: Vec<ClassField>,
contents: String,
typescript: String,
constructor: Option<String>,
fields: Vec<ClassField>,
}
pub struct ClassField {
pub name: String,
struct ClassField {
name: String,
readonly: bool,
}
pub struct SubContext<'a, 'b: 'a> {
@ -416,7 +417,8 @@ impl<'a> Context<'a> {
cx.method(true)
.argument(&descriptor)
.ret(&None);
ts_dst.push_str(&format!("{}: {}\n",
ts_dst.push_str(&format!("{}{}: {}\n",
if field.readonly { "readonly " } else { "" },
field.name,
&cx.js_arguments[0].1));
cx.finish("", &format!("wasm.{}", wasm_setter)).0
@ -430,9 +432,11 @@ impl<'a> Context<'a> {
dst.push_str(&field.name);
dst.push_str(&get);
dst.push_str("\n");
dst.push_str("set ");
dst.push_str(&field.name);
dst.push_str(&set);
if !field.readonly {
dst.push_str("set ");
dst.push_str(&field.name);
dst.push_str(&set);
}
}
dst.push_str(&format!("
@ -1312,6 +1316,7 @@ impl<'a, 'b> SubContext<'a, 'b> {
.extend(s.fields.iter().map(|s| {
ClassField {
name: s.name.clone(),
readonly: s.readonly,
}
}));
}