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#![crate_type = "dylib"]
#![feature(plugin_registrar, rustc_private)]
extern crate syntax;
extern crate rustc_plugin;
use syntax::abi::Abi;
use syntax::ast::{self, Ident, Generics, Item, TraitItemKind, TraitRef, TraitItem, Path,
WhereClause, PathParameters, Ty, AngleBracketedParameterData,
PathSegment, ExprKind,Expr, ItemKind, StmtKind, Stmt, TyKind, MethodSig,
Unsafety, Constness, FunctionRetTy, FnDecl };
use syntax::codemap::{ self, Spanned};
use syntax::ext::base::{ExtCtxt, MultiModifier, Annotatable};
use syntax::ext::build::AstBuilder;
use syntax::ptr::P;
use syntax::symbol::Symbol;
use syntax::tokenstream::{TokenStream};
use syntax::util::ThinVec;
use rustc_plugin::Registry;
#[plugin_registrar]
#[doc(hidden)]
pub fn plugin_registrar(reg: &mut Registry) {
reg.register_syntax_extension(Symbol::intern("trait_tests"),
MultiModifier(Box::new(expand_meta_trait_test)));
}
fn expand_meta_trait_test(cx: &mut ExtCtxt,
span: codemap::Span,
_: &ast::MetaItem,
annot_item: Annotatable) -> Vec<Annotatable> {
let item_kind;
let item = annot_item.expect_item();
{
match item.node {
ItemKind::Impl(_, _, _, _, Some(TraitRef { path: ref trait_ref, .. } ), ref impl_type, _) => {
match trait_ref { &Path{ ref segments, .. } => {
let trait_name = &segments[0].identifier.name.to_string();
match **impl_type {
Ty {
id: ast::DUMMY_NODE_ID,
node: TyKind::Path(None, Path{ segments: ref a, .. }),
..
} => {
match a[0] {
PathSegment { parameters: ref maybe_angle, identifier: ref type_impl_ident, .. } => {
let mut _unangled: Option<Ty> = None;
if let &Some(ref angle) = maybe_angle {
if let PathParameters::AngleBracketed(
AngleBracketedParameterData { types: ref _unangled, .. }) = **angle {
}
}
let type_impl_name = &type_impl_ident.name.to_string().clone();
let angles = if let Some(angle_ty) = _unangled {
Some(P(PathParameters::AngleBracketed(AngleBracketedParameterData {
span,
lifetimes: vec![],
bindings: vec![],
types: vec![P(angle_ty.clone())]
})))
} else {
None
};
let test_all_call = Stmt {
id: ast::DUMMY_NODE_ID,
node: StmtKind::Expr(P(Expr{
span,
attrs: ThinVec::new(),
id: ast::DUMMY_NODE_ID,
node: ExprKind::Call(P(Expr {
span,
attrs: ThinVec::new(),
id: ast::DUMMY_NODE_ID,
node:
ExprKind::Path(None, ::syntax::ast::Path {
span,
segments: vec![
PathSegment { span, parameters: angles, identifier: type_impl_ident.clone() },
PathSegment { span, parameters: None, identifier: Ident::from_str("test_all") },
]
}
)
}), vec![])
})),
span,
};
let body = cx.block(span, vec![test_all_call]);
let test_method_name = String::from("trait_test_")
+ &type_impl_name.to_lowercase() +
"_" + &trait_name.to_lowercase();
let test = cx.item_fn(span, Ident::from_str(&test_method_name),
vec![], cx.ty(span, TyKind::Tup(vec![])), body);
let mut attrs = item.attrs.clone();
attrs.push(cx.attribute(span, cx.meta_word(span, Symbol::intern("test"))));
let test_fn = Annotatable::Item(P(ast::Item {attrs, ..(*test).clone()}));
return vec![Annotatable::Item(P(Item{attrs: Vec::new(), ..(*item).clone() })), test_fn];
}
}
},
_ => {}
}
}
}
},
ItemKind::Trait(a, b, ref c, ref d, ref trait_items) => {
let mut test_names = vec![];
for method in trait_items {
match method {
&TraitItem {
generics:Generics{ params: ref v, ..},
node:TraitItemKind::Method(
MethodSig{ decl: ref fn_decl, .. }, Some(_)),
..
} if v.is_empty() => {
match **fn_decl {
FnDecl{inputs: ref args, ..} if args.is_empty() => {
let fn_call = Stmt {
id: ast::DUMMY_NODE_ID,
node: StmtKind::Semi(P(Expr {
id: ast::DUMMY_NODE_ID,
node: ExprKind::Call(P(Expr {
span,
attrs: ThinVec::new(),
id: ast::DUMMY_NODE_ID,
node:
ExprKind::Path(None, ::syntax::ast::Path {
span,
segments: vec![
PathSegment { span, parameters: None, identifier: Ident::from_str("Self") },
PathSegment { span, parameters: None, identifier: method.ident.clone() },
]
})
}), vec![]),
span,
attrs: ThinVec::new()
})),
span,
};
test_names.push(fn_call);
},
_ => {}
}
},
_ => {}
}
}
let body = cx.block(span, test_names);
let func = ::syntax::ast::TraitItemKind::Method(MethodSig {
abi: Abi::Rust,
constness: Spanned {
node: Constness::NotConst,
span
},
decl: P(FnDecl {
inputs: vec![],
output: FunctionRetTy::Default(
span
),
variadic: false
}),
unsafety: Unsafety::Normal
}, Some(body) );
let prop = ast::TraitItem {
attrs: Vec::new(),
ident: Ident::from_str("test_all"),
tokens: Some(TokenStream::empty()),
id:ast::DUMMY_NODE_ID,
span,
generics: Generics{span, where_clause:WhereClause{
id:ast::DUMMY_NODE_ID,
span,
predicates:vec![]}, params:vec![]},
node: func
};
let mut items = trait_items.clone();
items.push(prop);
item_kind = ItemKind::Trait(a, b, c.clone(), d.clone(), items);
return vec![Annotatable::Item(P(Item{ node: item_kind, ..(*item).clone() }))]
}
_ => {
cx.span_err(
span, "#[trait_tests] only supported on traits and associated impls");
}
}
}
vec![Annotatable::Item(P(Item{ ..(*item).clone() }))]
}