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use std::rc::Rc;
use syntax::ast;
use syntax::codemap;
use syntax::ext::base::{Annotatable, ExtCtxt, SyntaxExtension, Resolver};
use syntax::ext::build::AstBuilder;
use syntax::ptr::P;
use syntax::symbol::Symbol;
use syntax_pos::Span;
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 {
($x:ident) => (
::deriving::generic::ty::Path::new_local(stringify!($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)*) => (
::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 custom;
#[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 allow_unstable(cx: &mut ExtCtxt, span: Span, attr_name: &str) -> Span {
Span {
expn_id: cx.codemap().record_expansion(codemap::ExpnInfo {
call_site: span,
callee: codemap::NameAndSpan {
format: codemap::MacroAttribute(Symbol::intern(attr_name)),
span: Some(span),
allow_internal_unstable: true,
},
}),
..span
}
}
macro_rules! derive_traits {
($( $name:expr => $func:path, )+) => {
pub fn is_builtin_trait(name: ast::Name) -> bool {
match &*name.as_str() {
$( $name )|+ => true,
_ => false,
}
}
pub fn register_builtin_derives(resolver: &mut Resolver) {
$(
resolver.add_builtin(
ast::Ident::with_empty_ctxt(Symbol::intern($name)),
Rc::new(SyntaxExtension::BuiltinDerive($func))
);
)*
}
}
}
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,
"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,
}
#[inline]
fn warn_if_deprecated(ecx: &mut ExtCtxt, sp: Span, name: &str) {
if let Some(replacement) = match name {
"Encodable" => Some("RustcEncodable"),
"Decodable" => Some("RustcDecodable"),
_ => None,
} {
ecx.span_warn(sp,
&format!("derive({}) is deprecated in favor of derive({})",
name,
replacement));
}
}
fn hygienic_type_parameter(item: &Annotatable, base: &str) -> String {
let mut typaram = String::from(base);
if let Annotatable::Item(ref item) = *item {
match item.node {
ast::ItemKind::Struct(_, ast::Generics { ref ty_params, .. }) |
ast::ItemKind::Enum(_, ast::Generics { ref ty_params, .. }) => {
for ty in ty_params.iter() {
typaram.push_str(&ty.ident.name.as_str());
}
}
_ => {}
}
}
typaram
}
fn call_intrinsic(cx: &ExtCtxt,
mut span: Span,
intrinsic: &str,
args: Vec<P<ast::Expr>>)
-> P<ast::Expr> {
span.expn_id = cx.codemap().record_expansion(codemap::ExpnInfo {
call_site: span,
callee: codemap::NameAndSpan {
format: codemap::MacroAttribute(Symbol::intern("derive")),
span: Some(span),
allow_internal_unstable: true,
},
});
let path = cx.std_path(&["intrinsics", intrinsic]);
let call = cx.expr_call_global(span, path, args);
cx.expr_block(P(ast::Block {
stmts: vec![cx.stmt_expr(call)],
id: ast::DUMMY_NODE_ID,
rules: ast::BlockCheckMode::Unsafe(ast::CompilerGenerated),
span: span,
}))
}