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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.
//! The compiler code necessary to implement the `#[derive]` extensions.
//!
//! FIXME (#2810): hygiene. Search for "__" strings (in other files too). We also assume "extra" is
//! the standard library, and "std" is the core library.
use ast::{Item, MetaItem, MetaList, MetaNameValue, MetaWord};
use ext::base::ExtCtxt;
use codemap::Span;
use ptr::P;
pub mod bounds;
pub mod clone;
pub mod encodable;
pub mod decodable;
pub mod hash;
pub mod rand;
pub mod show;
pub mod zero;
pub mod default;
pub mod primitive;
#[path="cmp/eq.rs"]
pub mod eq;
#[path="cmp/totaleq.rs"]
pub mod totaleq;
#[path="cmp/ord.rs"]
pub mod ord;
#[path="cmp/totalord.rs"]
pub mod totalord;
pub mod generic;
pub fn expand_meta_deriving(cx: &mut ExtCtxt,
_span: Span,
mitem: &MetaItem,
item: &Item,
push: Box<FnMut(P<Item>)>) {
cx.span_warn(mitem.span, "`deriving` is deprecated; use `derive`");
expand_meta_derive(cx, _span, mitem, item, push)
}
pub fn expand_meta_derive(cx: &mut ExtCtxt,
_span: Span,
mitem: &MetaItem,
item: &Item,
mut push: Box<FnMut(P<Item>)>) {
match mitem.node {
MetaNameValue(_, ref l) => {
cx.span_err(l.span, "unexpected value in `derive`");
}
MetaWord(_) => {
cx.span_warn(mitem.span, "empty trait list in `derive`");
}
MetaList(_, ref titems) if titems.len() == 0 => {
cx.span_warn(mitem.span, "empty trait list in `derive`");
}
MetaList(_, ref titems) => {
for titem in titems.iter().rev() {
match titem.node {
MetaNameValue(ref tname, _) |
MetaList(ref tname, _) |
MetaWord(ref tname) => {
macro_rules! expand(($func:path) => ($func(cx, titem.span,
&**titem, item,
|i| push.call_mut((i,)))));
match tname.get() {
"Clone" => expand!(clone::expand_deriving_clone),
"Hash" => expand!(hash::expand_deriving_hash),
"RustcEncodable" => {
expand!(encodable::expand_deriving_rustc_encodable)
}
"RustcDecodable" => {
expand!(decodable::expand_deriving_rustc_decodable)
}
"Encodable" => {
cx.span_warn(titem.span,
"derive(Encodable) is deprecated \
in favor of derive(RustcEncodable)");
expand!(encodable::expand_deriving_encodable)
}
"Decodable" => {
cx.span_warn(titem.span,
"derive(Decodable) is deprecated \
in favor of derive(RustcDecodable)");
expand!(decodable::expand_deriving_decodable)
}
"PartialEq" => expand!(eq::expand_deriving_eq),
"Eq" => expand!(totaleq::expand_deriving_totaleq),
"PartialOrd" => expand!(ord::expand_deriving_ord),
"Ord" => expand!(totalord::expand_deriving_totalord),
"Rand" => expand!(rand::expand_deriving_rand),
"Show" => expand!(show::expand_deriving_show),
"Zero" => expand!(zero::expand_deriving_zero),
"Default" => expand!(default::expand_deriving_default),
"FromPrimitive" => expand!(primitive::expand_deriving_from_primitive),
"Send" => expand!(bounds::expand_deriving_bound),
"Sync" => expand!(bounds::expand_deriving_bound),
"Copy" => expand!(bounds::expand_deriving_bound),
ref tname => {
cx.span_err(titem.span,
format!("unknown `derive` \
trait: `{}`",
*tname)[]);
}
};
}
}
}
}
}
}
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