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// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use ast::{meta_item, item, expr};
use codemap::span;
use ext::base::ext_ctxt;
use ext::build;
use ext::deriving::generic::*;
pub fn expand_deriving_to_str(cx: @ext_ctxt,
span: span,
mitem: @meta_item,
in_items: ~[@item])
-> ~[@item] {
let trait_def = TraitDef {
path: Path::new(~[~"core", ~"to_str", ~"ToStr"]),
additional_bounds: ~[],
generics: LifetimeBounds::empty(),
methods: ~[
MethodDef {
name: ~"to_str",
generics: LifetimeBounds::empty(),
explicit_self: borrowed_explicit_self(),
args: ~[],
ret_ty: Ptr(~Literal(Path::new_local(~"str")), Owned),
const_nonmatching: false,
combine_substructure: to_str_substructure
}
]
};
expand_deriving_generic(cx, span, mitem, in_items, &trait_def)
}
fn to_str_substructure(cx: @ext_ctxt, span: span, substr: &Substructure) -> @expr {
match substr.self_args {
[self_obj] => {
let self_addr = build::mk_addr_of(cx, span, self_obj);
build::mk_call_global(cx, span,
~[cx.ident_of("core"),
cx.ident_of("sys"),
cx.ident_of("log_str")],
~[self_addr])
}
_ => cx.span_bug(span, "Invalid number of arguments in `deriving(ToStr)`")
}
}
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