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use ast::{MetaItem, MetaWord};
use attr::AttrMetaMethods;
use ext::base::{ExtCtxt, SyntaxEnv, MultiModifier, Annotatable};
use ext::build::AstBuilder;
use feature_gate;
use codemap::Span;
use parse::token::{intern, intern_and_get_ident};
macro_rules! pathvec {
($($x:ident)::+) => (
vec![ $( stringify!($x) ),+ ]
)
}
macro_rules! path {
($($x:tt)*) => (
::ext::deriving::generic::ty::Path::new( pathvec!( $($x)* ) )
)
}
macro_rules! path_local {
($x:ident) => (
::ext::deriving::generic::ty::Path::new_local(stringify!($x))
)
}
macro_rules! pathvec_std {
($cx:expr, $first:ident :: $($rest:ident)::+) => ({
let mut v = pathvec!($($rest)::+);
if let Some(s) = $cx.crate_root {
v.insert(0, s);
}
v
})
}
macro_rules! path_std {
($($x:tt)*) => (
::ext::deriving::generic::ty::Path::new( pathvec_std!( $($x)* ) )
)
}
pub mod bounds;
pub mod clone;
pub mod encodable;
pub mod decodable;
pub mod hash;
pub mod debug;
pub mod default;
pub mod primitive;
#[path="cmp/partial_eq.rs"]
pub mod partial_eq;
#[path="cmp/eq.rs"]
pub mod eq;
#[path="cmp/partial_ord.rs"]
pub mod partial_ord;
#[path="cmp/ord.rs"]
pub mod ord;
pub mod generic;
fn expand_derive(cx: &mut ExtCtxt,
span: Span,
mitem: &MetaItem,
annotatable: Annotatable)
-> Annotatable {
annotatable.map_item_or(|item| {
item.map(|mut item| {
if mitem.value_str().is_some() {
cx.span_err(mitem.span, "unexpected value in `derive`");
}
let traits = mitem.meta_item_list().unwrap_or(&[]);
if traits.is_empty() {
cx.span_warn(mitem.span, "empty trait list in `derive`");
}
for titem in traits.iter().rev() {
let tname = match titem.node {
MetaWord(ref tname) => tname,
_ => {
cx.span_err(titem.span, "malformed `derive` entry");
continue;
}
};
if !(is_builtin_trait(tname) || cx.ecfg.enable_custom_derive()) {
feature_gate::emit_feature_err(&cx.parse_sess.span_diagnostic,
"custom_derive",
titem.span,
feature_gate::GateIssue::Language,
feature_gate::EXPLAIN_CUSTOM_DERIVE);
continue;
}
item.attrs.push(cx.attribute(titem.span, cx.meta_word(titem.span,
intern_and_get_ident(&format!("derive_{}", tname)))));
}
item
})
}, |a| {
cx.span_err(span, "`derive` can only be applied to items");
a
})
}
macro_rules! derive_traits {
($( $name:expr => $func:path, )+) => {
pub fn register_all(env: &mut SyntaxEnv) {
env.insert(intern("derive"),
MultiModifier(Box::new(expand_derive)));
}
fn is_builtin_trait(name: &str) -> bool {
match name {
$( $name )|+ => true,
_ => false,
}
}
}
}
derive_traits! {
"Clone" => clone::expand_deriving_clone,
"Hash" => hash::expand_deriving_hash,
"RustcEncodable" => encodable::expand_deriving_rustc_encodable,
"RustcDecodable" => decodable::expand_deriving_rustc_decodable,
"PartialEq" => partial_eq::expand_deriving_partial_eq,
"Eq" => eq::expand_deriving_eq,
"PartialOrd" => partial_ord::expand_deriving_partial_ord,
"Ord" => ord::expand_deriving_ord,
"Debug" => debug::expand_deriving_debug,
"Default" => default::expand_deriving_default,
"FromPrimitive" => primitive::expand_deriving_from_primitive,
"Send" => bounds::expand_deriving_unsafe_bound,
"Sync" => bounds::expand_deriving_unsafe_bound,
"Copy" => bounds::expand_deriving_copy,
"Encodable" => encodable::expand_deriving_encodable,
"Decodable" => decodable::expand_deriving_decodable,
}