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// Copyright 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::{MetaItem, Item, Expr};
use codemap::Span;
use ext::base::ExtCtxt;
use ext::build::AstBuilder;
use ext::deriving::generic::*;
pub fn expand_deriving_totaleq(cx: &mut ExtCtxt,
span: Span,
mitem: @MetaItem,
item: @Item,
push: |@Item|) {
fn cs_total_eq_assert(cx: &mut ExtCtxt, span: Span, substr: &Substructure) -> @Expr {
cs_same_method(|cx, span, exprs| {
// create `a.<method>(); b.<method>(); c.<method>(); ...`
// (where method is `assert_receiver_is_total_eq`)
let stmts = exprs.move_iter().map(|e| cx.stmt_expr(e)).collect();
let block = cx.block(span, stmts, None);
cx.expr_block(block)
},
|cx, sp, _, _| cx.span_bug(sp, "non matching enums in deriving(TotalEq)?"),
cx,
span,
substr)
}
let trait_def = TraitDef {
span: span,
attributes: Vec::new(),
path: Path::new(vec!("std", "cmp", "TotalEq")),
additional_bounds: Vec::new(),
generics: LifetimeBounds::empty(),
methods: vec!(
MethodDef {
name: "assert_receiver_is_total_eq",
generics: LifetimeBounds::empty(),
explicit_self: borrowed_explicit_self(),
args: vec!(),
ret_ty: nil_ty(),
inline: true,
const_nonmatching: true,
combine_substructure: cs_total_eq_assert
}
)
};
trait_def.expand(cx, mitem, item, push)
}
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