6ab95bdd62
There are a large number of places that incorrectly refer to deriving in comments, instead of derives. Fixes #20984
94 lines
3.4 KiB
Rust
94 lines
3.4 KiB
Rust
// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use ast::{MetaItem, Item, Expr, self};
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use codemap::Span;
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use ext::base::ExtCtxt;
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use ext::build::AstBuilder;
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use ext::deriving::generic::*;
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use ext::deriving::generic::ty::*;
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use parse::token::InternedString;
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use ptr::P;
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pub fn expand_deriving_eq<F>(cx: &mut ExtCtxt,
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span: Span,
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mitem: &MetaItem,
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item: &Item,
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push: F) where
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F: FnOnce(P<Item>),
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{
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// structures are equal if all fields are equal, and non equal, if
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// any fields are not equal or if the enum variants are different
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fn cs_eq(cx: &mut ExtCtxt, span: Span, substr: &Substructure) -> P<Expr> {
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cs_fold(
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true, // use foldl
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|cx, span, subexpr, self_f, other_fs| {
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let other_f = match other_fs {
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[ref o_f] => o_f,
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_ => cx.span_bug(span, "not exactly 2 arguments in `derive(PartialEq)`")
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};
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let eq = cx.expr_binary(span, ast::BiEq, self_f, other_f.clone());
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cx.expr_binary(span, ast::BiAnd, subexpr, eq)
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},
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cx.expr_bool(span, true),
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box |cx, span, _, _| cx.expr_bool(span, false),
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cx, span, substr)
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}
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fn cs_ne(cx: &mut ExtCtxt, span: Span, substr: &Substructure) -> P<Expr> {
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cs_fold(
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true, // use foldl
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|cx, span, subexpr, self_f, other_fs| {
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let other_f = match other_fs {
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[ref o_f] => o_f,
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_ => cx.span_bug(span, "not exactly 2 arguments in `derive(PartialEq)`")
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};
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let eq = cx.expr_binary(span, ast::BiNe, self_f, other_f.clone());
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cx.expr_binary(span, ast::BiOr, subexpr, eq)
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},
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cx.expr_bool(span, false),
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box |cx, span, _, _| cx.expr_bool(span, true),
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cx, span, substr)
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}
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macro_rules! md {
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($name:expr, $f:ident) => { {
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let inline = cx.meta_word(span, InternedString::new("inline"));
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let attrs = vec!(cx.attribute(span, inline));
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MethodDef {
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name: $name,
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generics: LifetimeBounds::empty(),
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explicit_self: borrowed_explicit_self(),
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args: vec!(borrowed_self()),
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ret_ty: Literal(Path::new(vec!("bool"))),
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attributes: attrs,
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combine_substructure: combine_substructure(box |a, b, c| {
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$f(a, b, c)
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})
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}
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} }
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}
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let trait_def = TraitDef {
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span: span,
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attributes: Vec::new(),
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path: Path::new(vec!("std", "cmp", "PartialEq")),
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additional_bounds: Vec::new(),
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generics: LifetimeBounds::empty(),
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methods: vec!(
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md!("eq", cs_eq),
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md!("ne", cs_ne)
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)
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};
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trait_def.expand(cx, mitem, item, push)
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}
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