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Allow classes to implement ifaces

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Introduce syntax like:

iface animal { ... }
class cat implements animal { ... }

to allow classes to implement ifaces. Casting classes to ifaces
is *not* yet supported. ifaces that a class implements are not
yet included in metadata.

The syntax is subject to change, and may go away completely if we
decide to use duck typing to relate classes with ifaces (see
http://smallcultfollowing.com/babysteps/blog/2012/04/10/declared-vs-duckish-typing/ )
This commit is contained in:
Tim Chevalier
2012-04-11 16:18:00 -07:00
parent 9fda1578a2
commit 5c12cd72f4
19 changed files with 242 additions and 83 deletions
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13
src/librustsyntax/parse/parser.rs
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@@ -2143,11 +2143,19 @@ fn ident_to_path_tys(p: parser, i: ast::ident,
@spanned(s.lo, s.hi, p_)
}
fn parse_iface_ref_list(p:parser) -> [ast::iface_ref] {
parse_seq_to_before_end(token::LBRACE, seq_sep(token::COMMA),
{|p| {path: parse_path(p), id: p.get_id()}}, p)
}
fn parse_item_class(p: parser, attrs: [ast::attribute]) -> @ast::item {
let lo = p.last_span.lo;
let class_name = parse_value_ident(p);
let ty_params = parse_ty_params(p);
let class_path = ident_to_path_tys(p, class_name, ty_params);
let ifaces : [ast::iface_ref] = if eat_word(p, "implements")
{ parse_iface_ref_list(p) }
else { [] };
expect(p, token::LBRACE);
let mut ms: [@ast::class_member] = [];
let ctor_id = p.get_id();
@@ -2163,9 +2171,8 @@ fn parse_item_class(p: parser, attrs: [ast::attribute]) -> @ast::item {
p.bump();
alt the_ctor {
some((ct_d, ct_b, ct_s)) {
ret mk_item(p, lo, p.last_span.hi,
class_name,
ast::item_class(ty_params, ms,
ret mk_item(p, lo, p.last_span.hi, class_name,
ast::item_class(ty_params, ifaces, ms,
{node: {id: ctor_id,
self_id: p.get_id(),
dec: ct_d,