1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
|
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use syntax::ast;
use syntax::ast::MetaItem;
use syntax::codemap::Span;
use syntax::ext::base::{Annotatable, ExtCtxt};
use utils::match_ty_unwrap;
pub fn expand_reflector(cx: &mut ExtCtxt, span: Span, _: &MetaItem, annotatable: &Annotatable,
push: &mut FnMut(Annotatable)) {
if let &Annotatable::Item(ref item) = annotatable {
if let ast::ItemStruct(ref def, _) = item.node {
let struct_name = item.ident;
// This path has to be hardcoded, unfortunately, since we can't resolve paths at expansion time
match def.fields().iter().find(
|f| match_ty_unwrap(&*f.node.ty, &["dom", "bindings", "reflector", "Reflector"]).is_some()) {
// If it has a field that is a Reflector, use that
Some(f) => {
let field_name = f.node.ident();
let impl_item = quote_item!(cx,
impl ::dom::bindings::reflector::Reflectable for $struct_name {
fn reflector<'a>(&'a self) -> &'a ::dom::bindings::reflector::Reflector {
&self.$field_name
}
fn init_reflector(&mut self, obj: *mut ::js::jsapi::JSObject) {
self.$field_name.set_jsobject(obj);
}
}
);
impl_item.map(|it| push(Annotatable::Item(it)))
},
// Or just call it on the first field (supertype).
None => {
let field_name = def.fields()[0].node.ident();
let impl_item = quote_item!(cx,
impl ::dom::bindings::reflector::Reflectable for $struct_name {
fn reflector<'a>(&'a self) -> &'a ::dom::bindings::reflector::Reflector {
self.$field_name.reflector()
}
fn init_reflector(&mut self, obj: *mut ::js::jsapi::JSObject) {
self.$field_name.init_reflector(obj);
}
}
);
impl_item.map(|it| push(Annotatable::Item(it)))
}
};
let impl_item = quote_item!(cx,
impl ::js::conversions::ToJSValConvertible for $struct_name {
#[allow(unsafe_code)]
unsafe fn to_jsval(&self,
cx: *mut ::js::jsapi::JSContext,
rval: ::js::jsapi::MutableHandleValue) {
let object = ::dom::bindings::reflector::Reflectable::reflector(self).get_jsobject();
object.to_jsval(cx, rval)
}
}
);
impl_item.map(|it| push(Annotatable::Item(it)));
} else {
cx.span_err(span, "#[dom_struct] seems to have been applied to a non-struct");
}
}
}
|
