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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 deriving::generic::*;
use deriving::generic::ty::*;
use syntax::ast::{Expr, MetaItem};
use syntax::ext::base::{Annotatable, ExtCtxt};
use syntax::ext::build::AstBuilder;
use syntax::parse::token::InternedString;
use syntax::ptr::P;
use syntax_pos::Span;
pub fn expand_deriving_eq(cx: &mut ExtCtxt,
span: Span,
mitem: &MetaItem,
item: &Annotatable,
push: &mut FnMut(Annotatable)) {
fn cs_total_eq_assert(cx: &mut ExtCtxt, span: Span, substr: &Substructure) -> P<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.into_iter().map(|e| cx.stmt_expr(e)).collect();
let block = cx.block(span, stmts);
cx.expr_block(block)
},
Box::new(|cx, sp, _, _| {
cx.span_bug(sp, "non matching enums in derive(Eq)?")
}),
cx,
span,
substr)
}
let inline = cx.meta_word(span, InternedString::new("inline"));
let hidden = cx.meta_word(span, InternedString::new("hidden"));
let doc = cx.meta_list(span, InternedString::new("doc"), vec![hidden]);
let attrs = vec![cx.attribute(span, inline), cx.attribute(span, doc)];
let trait_def = TraitDef {
span: span,
attributes: Vec::new(),
path: path_std!(cx, core::cmp::Eq),
additional_bounds: Vec::new(),
generics: LifetimeBounds::empty(),
is_unsafe: false,
methods: vec![MethodDef {
name: "assert_receiver_is_total_eq",
generics: LifetimeBounds::empty(),
explicit_self: borrowed_explicit_self(),
args: vec![],
ret_ty: nil_ty(),
attributes: attrs,
is_unsafe: false,
unify_fieldless_variants: true,
combine_substructure: combine_substructure(Box::new(|a, b, c| {
cs_total_eq_assert(a, b, c)
})),
}],
associated_types: Vec::new(),
};
trait_def.expand(cx, mitem, item, push)
}
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