1 // Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 // The Rust abstract syntax tree.
13 pub use self::AsmDialect::*;
14 pub use self::AttrStyle::*;
15 pub use self::BindingMode::*;
16 pub use self::BinOp::*;
17 pub use self::BlockCheckMode::*;
18 pub use self::CaptureClause::*;
19 pub use self::Decl_::*;
20 pub use self::ExplicitSelf_::*;
21 pub use self::Expr_::*;
22 pub use self::FloatTy::*;
23 pub use self::FunctionRetTy::*;
24 pub use self::ForeignItem_::*;
25 pub use self::ImplItem::*;
26 pub use self::InlinedItem::*;
27 pub use self::IntTy::*;
28 pub use self::Item_::*;
29 pub use self::KleeneOp::*;
30 pub use self::Lit_::*;
31 pub use self::LitIntType::*;
32 pub use self::LocalSource::*;
33 pub use self::Mac_::*;
34 pub use self::MacStmtStyle::*;
35 pub use self::MetaItem_::*;
36 pub use self::Method_::*;
37 pub use self::Mutability::*;
38 pub use self::Onceness::*;
39 pub use self::Pat_::*;
40 pub use self::PathListItem_::*;
41 pub use self::PatWildKind::*;
42 pub use self::PrimTy::*;
43 pub use self::Sign::*;
44 pub use self::Stmt_::*;
45 pub use self::StrStyle::*;
46 pub use self::StructFieldKind::*;
47 pub use self::TokenTree::*;
48 pub use self::TraitItem::*;
50 pub use self::TyParamBound::*;
51 pub use self::UintTy::*;
52 pub use self::UnboxedClosureKind::*;
53 pub use self::UnOp::*;
54 pub use self::UnsafeSource::*;
55 pub use self::VariantKind::*;
56 pub use self::ViewItem_::*;
57 pub use self::ViewPath_::*;
58 pub use self::Visibility::*;
59 pub use self::PathParameters::*;
61 use codemap::{Span, Spanned, DUMMY_SP, ExpnId};
64 use owned_slice::OwnedSlice;
65 use parse::token::{InternedString, str_to_ident};
73 use serialize::{Encodable, Decodable, Encoder, Decoder};
75 // FIXME #6993: in librustc, uses of "ident" should be replaced
78 /// An identifier contains a Name (index into the interner
79 /// table) and a SyntaxContext to track renaming and
80 /// macro expansion per Flatt et al., "Macros
81 /// That Work Together"
82 #[derive(Clone, Copy, Hash, PartialOrd, Eq, Ord)]
85 pub ctxt: SyntaxContext
89 /// Construct an identifier with the given name and an empty context:
90 pub fn new(name: Name) -> Ident { Ident {name: name, ctxt: EMPTY_CTXT}}
92 pub fn as_str<'a>(&'a self) -> &'a str {
96 pub fn encode_with_hygiene(&self) -> String {
97 format!("\x00name_{},ctxt_{}\x00",
103 impl fmt::Show for Ident {
104 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
105 write!(f, "{}#{}", self.name, self.ctxt)
109 impl fmt::String for Ident {
110 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
111 fmt::String::fmt(&self.name, f)
115 impl fmt::Show for Name {
116 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
117 let Name(nm) = *self;
118 write!(f, "{:?}({})", token::get_name(*self).get(), nm)
122 impl fmt::String for Name {
123 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
124 fmt::String::fmt(token::get_name(*self).get(), f)
128 impl PartialEq for Ident {
129 fn eq(&self, other: &Ident) -> bool {
130 if self.ctxt == other.ctxt {
131 self.name == other.name
133 // IF YOU SEE ONE OF THESE FAILS: it means that you're comparing
134 // idents that have different contexts. You can't fix this without
135 // knowing whether the comparison should be hygienic or non-hygienic.
136 // if it should be non-hygienic (most things are), just compare the
137 // 'name' fields of the idents. Or, even better, replace the idents
140 // On the other hand, if the comparison does need to be hygienic,
141 // one example and its non-hygienic counterpart would be:
142 // syntax::parse::token::Token::mtwt_eq
143 // syntax::ext::tt::macro_parser::token_name_eq
144 panic!("not allowed to compare these idents: {}, {}. \
145 Probably related to issue \\#6993", self, other);
148 fn ne(&self, other: &Ident) -> bool {
153 /// A SyntaxContext represents a chain of macro-expandings
154 /// and renamings. Each macro expansion corresponds to
157 // I'm representing this syntax context as an index into
158 // a table, in order to work around a compiler bug
159 // that's causing unreleased memory to cause core dumps
160 // and also perhaps to save some work in destructor checks.
161 // the special uint '0' will be used to indicate an empty
164 // this uint is a reference to a table stored in thread-local
166 pub type SyntaxContext = u32;
167 pub const EMPTY_CTXT : SyntaxContext = 0;
168 pub const ILLEGAL_CTXT : SyntaxContext = 1;
170 /// A name is a part of an identifier, representing a string or gensym. It's
171 /// the result of interning.
172 #[derive(Eq, Ord, PartialEq, PartialOrd, Hash,
173 RustcEncodable, RustcDecodable, Clone, Copy)]
174 pub struct Name(pub u32);
177 pub fn as_str<'a>(&'a self) -> &'a str {
179 // FIXME #12938: can't use copy_lifetime since &str isn't a &T
180 ::std::mem::transmute::<&str,&str>(token::get_name(*self).get())
184 pub fn uint(&self) -> uint {
185 let Name(nm) = *self;
189 pub fn ident(&self) -> Ident {
190 Ident { name: *self, ctxt: 0 }
194 /// A mark represents a unique id associated with a macro expansion
197 impl Encodable for Ident {
198 fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
199 s.emit_str(token::get_ident(*self).get())
203 impl Decodable for Ident {
204 fn decode<D: Decoder>(d: &mut D) -> Result<Ident, D::Error> {
205 Ok(str_to_ident(&try!(d.read_str())[]))
209 /// Function name (not all functions have names)
210 pub type FnIdent = Option<Ident>;
212 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash,
214 pub struct Lifetime {
220 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
221 pub struct LifetimeDef {
222 pub lifetime: Lifetime,
223 pub bounds: Vec<Lifetime>
226 /// A "Path" is essentially Rust's notion of a name; for instance:
227 /// std::cmp::PartialEq . It's represented as a sequence of identifiers,
228 /// along with a bunch of supporting information.
229 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
232 /// A `::foo` path, is relative to the crate root rather than current
233 /// module (like paths in an import).
235 /// The segments in the path: the things separated by `::`.
236 pub segments: Vec<PathSegment>,
239 /// A segment of a path: an identifier, an optional lifetime, and a set of
241 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
242 pub struct PathSegment {
243 /// The identifier portion of this path segment.
244 pub identifier: Ident,
246 /// Type/lifetime parameters attached to this path. They come in
247 /// two flavors: `Path<A,B,C>` and `Path(A,B) -> C`. Note that
248 /// this is more than just simple syntactic sugar; the use of
249 /// parens affects the region binding rules, so we preserve the
251 pub parameters: PathParameters,
254 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
255 pub enum PathParameters {
256 AngleBracketedParameters(AngleBracketedParameterData),
257 ParenthesizedParameters(ParenthesizedParameterData),
260 impl PathParameters {
261 pub fn none() -> PathParameters {
262 AngleBracketedParameters(AngleBracketedParameterData {
263 lifetimes: Vec::new(),
264 types: OwnedSlice::empty(),
265 bindings: OwnedSlice::empty(),
269 pub fn is_empty(&self) -> bool {
271 AngleBracketedParameters(ref data) => data.is_empty(),
273 // Even if the user supplied no types, something like
274 // `X()` is equivalent to `X<(),()>`.
275 ParenthesizedParameters(..) => false,
279 pub fn has_lifetimes(&self) -> bool {
281 AngleBracketedParameters(ref data) => !data.lifetimes.is_empty(),
282 ParenthesizedParameters(_) => false,
286 pub fn has_types(&self) -> bool {
288 AngleBracketedParameters(ref data) => !data.types.is_empty(),
289 ParenthesizedParameters(..) => true,
293 /// Returns the types that the user wrote. Note that these do not necessarily map to the type
294 /// parameters in the parenthesized case.
295 pub fn types(&self) -> Vec<&P<Ty>> {
297 AngleBracketedParameters(ref data) => {
298 data.types.iter().collect()
300 ParenthesizedParameters(ref data) => {
302 .chain(data.output.iter())
308 pub fn lifetimes(&self) -> Vec<&Lifetime> {
310 AngleBracketedParameters(ref data) => {
311 data.lifetimes.iter().collect()
313 ParenthesizedParameters(_) => {
319 pub fn bindings(&self) -> Vec<&P<TypeBinding>> {
321 AngleBracketedParameters(ref data) => {
322 data.bindings.iter().collect()
324 ParenthesizedParameters(_) => {
331 /// A path like `Foo<'a, T>`
332 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
333 pub struct AngleBracketedParameterData {
334 /// The lifetime parameters for this path segment.
335 pub lifetimes: Vec<Lifetime>,
336 /// The type parameters for this path segment, if present.
337 pub types: OwnedSlice<P<Ty>>,
338 /// Bindings (equality constraints) on associated types, if present.
339 /// E.g., `Foo<A=Bar>`.
340 pub bindings: OwnedSlice<P<TypeBinding>>,
343 impl AngleBracketedParameterData {
344 fn is_empty(&self) -> bool {
345 self.lifetimes.is_empty() && self.types.is_empty() && self.bindings.is_empty()
349 /// A path like `Foo(A,B) -> C`
350 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
351 pub struct ParenthesizedParameterData {
353 pub inputs: Vec<P<Ty>>,
356 pub output: Option<P<Ty>>,
359 pub type CrateNum = u32;
361 pub type NodeId = u32;
363 #[derive(Clone, Eq, Ord, PartialOrd, PartialEq, RustcEncodable,
364 RustcDecodable, Hash, Show, Copy)]
370 /// Item definitions in the currently-compiled crate would have the CrateNum
371 /// LOCAL_CRATE in their DefId.
372 pub const LOCAL_CRATE: CrateNum = 0;
373 pub const CRATE_NODE_ID: NodeId = 0;
375 /// When parsing and doing expansions, we initially give all AST nodes this AST
376 /// node value. Then later, in the renumber pass, we renumber them to have
377 /// small, positive ids.
378 pub const DUMMY_NODE_ID: NodeId = -1;
380 /// The AST represents all type param bounds as types.
381 /// typeck::collect::compute_bounds matches these against
382 /// the "special" built-in traits (see middle::lang_items) and
383 /// detects Copy, Send and Sync.
384 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
385 pub enum TyParamBound {
386 TraitTyParamBound(PolyTraitRef, TraitBoundModifier),
387 RegionTyParamBound(Lifetime)
390 /// A modifier on a bound, currently this is only used for `?Sized`, where the
391 /// modifier is `Maybe`. Negative bounds should also be handled here.
392 #[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
393 pub enum TraitBoundModifier {
398 pub type TyParamBounds = OwnedSlice<TyParamBound>;
400 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
404 pub bounds: TyParamBounds,
405 pub default: Option<P<Ty>>,
409 /// Represents lifetimes and type parameters attached to a declaration
410 /// of a function, enum, trait, etc.
411 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
412 pub struct Generics {
413 pub lifetimes: Vec<LifetimeDef>,
414 pub ty_params: OwnedSlice<TyParam>,
415 pub where_clause: WhereClause,
419 pub fn is_parameterized(&self) -> bool {
420 self.lifetimes.len() + self.ty_params.len() > 0
422 pub fn is_lt_parameterized(&self) -> bool {
423 self.lifetimes.len() > 0
425 pub fn is_type_parameterized(&self) -> bool {
426 self.ty_params.len() > 0
430 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
431 pub struct WhereClause {
433 pub predicates: Vec<WherePredicate>,
436 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
437 pub enum WherePredicate {
438 BoundPredicate(WhereBoundPredicate),
439 RegionPredicate(WhereRegionPredicate),
440 EqPredicate(WhereEqPredicate)
443 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
444 pub struct WhereBoundPredicate {
446 pub bounded_ty: P<Ty>,
447 pub bounds: OwnedSlice<TyParamBound>,
450 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
451 pub struct WhereRegionPredicate {
453 pub lifetime: Lifetime,
454 pub bounds: Vec<Lifetime>,
457 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
458 pub struct WhereEqPredicate {
465 /// The set of MetaItems that define the compilation environment of the crate,
466 /// used to drive conditional compilation
467 pub type CrateConfig = Vec<P<MetaItem>> ;
469 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
472 pub attrs: Vec<Attribute>,
473 pub config: CrateConfig,
475 pub exported_macros: Vec<MacroDef>,
478 pub type MetaItem = Spanned<MetaItem_>;
480 #[derive(Clone, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
482 MetaWord(InternedString),
483 MetaList(InternedString, Vec<P<MetaItem>>),
484 MetaNameValue(InternedString, Lit),
487 // can't be derived because the MetaList requires an unordered comparison
488 impl PartialEq for MetaItem_ {
489 fn eq(&self, other: &MetaItem_) -> bool {
491 MetaWord(ref ns) => match *other {
492 MetaWord(ref no) => (*ns) == (*no),
495 MetaNameValue(ref ns, ref vs) => match *other {
496 MetaNameValue(ref no, ref vo) => {
497 (*ns) == (*no) && vs.node == vo.node
501 MetaList(ref ns, ref miss) => match *other {
502 MetaList(ref no, ref miso) => {
504 miss.iter().all(|mi| miso.iter().any(|x| x.node == mi.node))
512 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
514 pub view_items: Vec<ViewItem>,
515 pub stmts: Vec<P<Stmt>>,
516 pub expr: Option<P<Expr>>,
518 pub rules: BlockCheckMode,
522 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
529 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
530 pub struct FieldPat {
533 pub is_shorthand: bool,
536 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
537 pub enum BindingMode {
538 BindByRef(Mutability),
539 BindByValue(Mutability),
542 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
543 pub enum PatWildKind {
544 /// Represents the wildcard pattern `_`
547 /// Represents the wildcard pattern `..`
551 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
553 /// Represents a wildcard pattern (either `_` or `..`)
554 PatWild(PatWildKind),
556 /// A PatIdent may either be a new bound variable,
557 /// or a nullary enum (in which case the third field
559 /// In the nullary enum case, the parser can't determine
560 /// which it is. The resolver determines this, and
561 /// records this pattern's NodeId in an auxiliary
562 /// set (of "PatIdents that refer to nullary enums")
563 PatIdent(BindingMode, SpannedIdent, Option<P<Pat>>),
565 /// "None" means a * pattern where we don't bind the fields to names.
566 PatEnum(Path, Option<Vec<P<Pat>>>),
568 PatStruct(Path, Vec<Spanned<FieldPat>>, bool),
571 PatRegion(P<Pat>, Mutability), // reference pattern
573 PatRange(P<Expr>, P<Expr>),
574 /// [a, b, ..i, y, z] is represented as:
575 /// PatVec(box [a, b], Some(i), box [y, z])
576 PatVec(Vec<P<Pat>>, Option<P<Pat>>, Vec<P<Pat>>),
580 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
581 pub enum Mutability {
586 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
608 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
616 pub type Stmt = Spanned<Stmt_>;
618 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
620 /// Could be an item or a local (let) binding:
621 StmtDecl(P<Decl>, NodeId),
623 /// Expr without trailing semi-colon (must have unit type):
624 StmtExpr(P<Expr>, NodeId),
626 /// Expr with trailing semi-colon (may have any type):
627 StmtSemi(P<Expr>, NodeId),
629 StmtMac(P<Mac>, MacStmtStyle),
632 #[derive(Clone, Copy, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
633 pub enum MacStmtStyle {
634 /// The macro statement had a trailing semicolon, e.g. `foo! { ... };`
635 /// `foo!(...);`, `foo![...];`
636 MacStmtWithSemicolon,
637 /// The macro statement had braces; e.g. foo! { ... }
639 /// The macro statement had parentheses or brackets and no semicolon; e.g.
640 /// `foo!(...)`. All of these will end up being converted into macro
642 MacStmtWithoutBraces,
645 /// Where a local declaration came from: either a true `let ... =
646 /// ...;`, or one desugared from the pattern of a for loop.
647 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
648 pub enum LocalSource {
653 // FIXME (pending discussion of #1697, #2178...): local should really be
654 // a refinement on pat.
655 /// Local represents a `let` statement, e.g., `let <pat>:<ty> = <expr>;`
656 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
659 pub ty: Option<P<Ty>>,
660 pub init: Option<P<Expr>>,
663 pub source: LocalSource,
666 pub type Decl = Spanned<Decl_>;
668 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
670 /// A local (let) binding:
676 /// represents one arm of a 'match'
677 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
679 pub attrs: Vec<Attribute>,
680 pub pats: Vec<P<Pat>>,
681 pub guard: Option<P<Expr>>,
685 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
687 pub ident: SpannedIdent,
692 pub type SpannedIdent = Spanned<Ident>;
694 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
695 pub enum BlockCheckMode {
697 UnsafeBlock(UnsafeSource),
700 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
701 pub enum UnsafeSource {
706 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
713 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
715 /// First expr is the place; second expr is the value.
716 ExprBox(Option<P<Expr>>, P<Expr>),
717 ExprVec(Vec<P<Expr>>),
718 ExprCall(P<Expr>, Vec<P<Expr>>),
719 ExprMethodCall(SpannedIdent, Vec<P<Ty>>, Vec<P<Expr>>),
720 ExprTup(Vec<P<Expr>>),
721 ExprBinary(BinOp, P<Expr>, P<Expr>),
722 ExprUnary(UnOp, P<Expr>),
724 ExprCast(P<Expr>, P<Ty>),
725 ExprIf(P<Expr>, P<Block>, Option<P<Expr>>),
726 ExprIfLet(P<Pat>, P<Expr>, P<Block>, Option<P<Expr>>),
727 // FIXME #6993: change to Option<Name> ... or not, if these are hygienic.
728 ExprWhile(P<Expr>, P<Block>, Option<Ident>),
729 // FIXME #6993: change to Option<Name> ... or not, if these are hygienic.
730 ExprWhileLet(P<Pat>, P<Expr>, P<Block>, Option<Ident>),
731 // FIXME #6993: change to Option<Name> ... or not, if these are hygienic.
732 ExprForLoop(P<Pat>, P<Expr>, P<Block>, Option<Ident>),
733 // Conditionless loop (can be exited with break, cont, or ret)
734 // FIXME #6993: change to Option<Name> ... or not, if these are hygienic.
735 ExprLoop(P<Block>, Option<Ident>),
736 ExprMatch(P<Expr>, Vec<Arm>, MatchSource),
737 ExprClosure(CaptureClause, Option<UnboxedClosureKind>, P<FnDecl>, P<Block>),
740 ExprAssign(P<Expr>, P<Expr>),
741 ExprAssignOp(BinOp, P<Expr>, P<Expr>),
742 ExprField(P<Expr>, SpannedIdent),
743 ExprTupField(P<Expr>, Spanned<uint>),
744 ExprIndex(P<Expr>, P<Expr>),
745 ExprRange(Option<P<Expr>>, Option<P<Expr>>),
747 /// Variable reference, possibly containing `::` and/or
748 /// type parameters, e.g. foo::bar::<baz>
751 ExprAddrOf(Mutability, P<Expr>),
752 ExprBreak(Option<Ident>),
753 ExprAgain(Option<Ident>),
754 ExprRet(Option<P<Expr>>),
756 ExprInlineAsm(InlineAsm),
760 /// A struct literal expression.
761 ExprStruct(Path, Vec<Field>, Option<P<Expr>> /* base */),
763 /// A vector literal constructed from one repeated element.
764 ExprRepeat(P<Expr> /* element */, P<Expr> /* count */),
766 /// No-op: used solely so we can pretty-print faithfully
770 /// A "qualified path":
772 /// <Vec<T> as SomeTrait>::SomeAssociatedItem
773 /// ^~~~~ ^~~~~~~~~ ^~~~~~~~~~~~~~~~~~
774 /// self_type trait_name item_name
775 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
777 pub self_type: P<Ty>,
778 pub trait_ref: P<TraitRef>,
779 pub item_name: Ident, // FIXME(#20301) -- should use Name
782 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
783 pub enum MatchSource {
785 IfLetDesugar { contains_else_clause: bool },
789 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
790 pub enum CaptureClause {
795 /// A delimited sequence of token trees
796 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
797 pub struct Delimited {
798 /// The type of delimiter
799 pub delim: token::DelimToken,
800 /// The span covering the opening delimiter
802 /// The delimited sequence of token trees
803 pub tts: Vec<TokenTree>,
804 /// The span covering the closing delimiter
805 pub close_span: Span,
809 /// Returns the opening delimiter as a token.
810 pub fn open_token(&self) -> token::Token {
811 token::OpenDelim(self.delim)
814 /// Returns the closing delimiter as a token.
815 pub fn close_token(&self) -> token::Token {
816 token::CloseDelim(self.delim)
819 /// Returns the opening delimiter as a token tree.
820 pub fn open_tt(&self) -> TokenTree {
821 TtToken(self.open_span, self.open_token())
824 /// Returns the closing delimiter as a token tree.
825 pub fn close_tt(&self) -> TokenTree {
826 TtToken(self.close_span, self.close_token())
830 /// A sequence of token treesee
831 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
832 pub struct SequenceRepetition {
833 /// The sequence of token trees
834 pub tts: Vec<TokenTree>,
835 /// The optional separator
836 pub separator: Option<token::Token>,
837 /// Whether the sequence can be repeated zero (*), or one or more times (+)
839 /// The number of `MatchNt`s that appear in the sequence (and subsequences)
840 pub num_captures: uint,
843 /// A Kleene-style [repetition operator](http://en.wikipedia.org/wiki/Kleene_star)
844 /// for token sequences.
845 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
851 /// When the main rust parser encounters a syntax-extension invocation, it
852 /// parses the arguments to the invocation as a token-tree. This is a very
853 /// loose structure, such that all sorts of different AST-fragments can
854 /// be passed to syntax extensions using a uniform type.
856 /// If the syntax extension is an MBE macro, it will attempt to match its
857 /// LHS token tree against the provided token tree, and if it finds a
858 /// match, will transcribe the RHS token tree, splicing in any captured
859 /// macro_parser::matched_nonterminals into the `SubstNt`s it finds.
861 /// The RHS of an MBE macro is the only place `SubstNt`s are substituted.
862 /// Nothing special happens to misnamed or misplaced `SubstNt`s.
863 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
864 #[doc="For macro invocations; parsing is delegated to the macro"]
867 TtToken(Span, token::Token),
868 /// A delimited sequence of token trees
869 TtDelimited(Span, Rc<Delimited>),
871 // This only makes sense in MBE macros.
873 /// A kleene-style repetition sequence with a span
874 // FIXME(eddyb) #12938 Use DST.
875 TtSequence(Span, Rc<SequenceRepetition>),
879 pub fn len(&self) -> uint {
881 TtToken(_, token::DocComment(_)) => 2,
882 TtToken(_, token::SpecialVarNt(..)) => 2,
883 TtToken(_, token::MatchNt(..)) => 3,
884 TtDelimited(_, ref delimed) => {
885 delimed.tts.len() + 2
887 TtSequence(_, ref seq) => {
894 pub fn get_tt(&self, index: uint) -> TokenTree {
895 match (self, index) {
896 (&TtToken(sp, token::DocComment(_)), 0) => {
897 TtToken(sp, token::Pound)
899 (&TtToken(sp, token::DocComment(name)), 1) => {
900 TtDelimited(sp, Rc::new(Delimited {
901 delim: token::Bracket,
903 tts: vec![TtToken(sp, token::Ident(token::str_to_ident("doc"),
905 TtToken(sp, token::Eq),
906 TtToken(sp, token::Literal(token::Str_(name), None))],
910 (&TtDelimited(_, ref delimed), _) => {
912 return delimed.open_tt();
914 if index == delimed.tts.len() + 1 {
915 return delimed.close_tt();
917 delimed.tts[index - 1].clone()
919 (&TtToken(sp, token::SpecialVarNt(var)), _) => {
920 let v = [TtToken(sp, token::Dollar),
921 TtToken(sp, token::Ident(token::str_to_ident(var.as_str()),
925 (&TtToken(sp, token::MatchNt(name, kind, name_st, kind_st)), _) => {
926 let v = [TtToken(sp, token::SubstNt(name, name_st)),
927 TtToken(sp, token::Colon),
928 TtToken(sp, token::Ident(kind, kind_st))];
931 (&TtSequence(_, ref seq), _) => {
932 seq.tts[index].clone()
934 _ => panic!("Cannot expand a token tree")
938 /// Returns the `Span` corresponding to this token tree.
939 pub fn get_span(&self) -> Span {
941 TtToken(span, _) => span,
942 TtDelimited(span, _) => span,
943 TtSequence(span, _) => span,
948 pub type Mac = Spanned<Mac_>;
950 /// Represents a macro invocation. The Path indicates which macro
951 /// is being invoked, and the vector of token-trees contains the source
952 /// of the macro invocation.
953 /// There's only one flavor, now, so this could presumably be simplified.
954 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
956 // NB: the additional ident for a macro_rules-style macro is actually
957 // stored in the enclosing item. Oog.
958 MacInvocTT(Path, Vec<TokenTree> , SyntaxContext), // new macro-invocation
961 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
967 pub type Lit = Spanned<Lit_>;
969 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
976 pub fn new<T:Int>(n: T) -> Sign {
985 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
986 pub enum LitIntType {
987 SignedIntLit(IntTy, Sign),
988 UnsignedIntLit(UintTy),
989 UnsuffixedIntLit(Sign)
993 pub fn suffix_len(&self) -> uint {
995 UnsuffixedIntLit(_) => 0,
996 SignedIntLit(s, _) => s.suffix_len(),
997 UnsignedIntLit(u) => u.suffix_len()
1002 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1004 LitStr(InternedString, StrStyle),
1005 LitBinary(Rc<Vec<u8>>),
1008 LitInt(u64, LitIntType),
1009 LitFloat(InternedString, FloatTy),
1010 LitFloatUnsuffixed(InternedString),
1014 // NB: If you change this, you'll probably want to change the corresponding
1015 // type structure in middle/ty.rs as well.
1016 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1019 pub mutbl: Mutability,
1022 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1023 pub struct TypeField {
1029 /// Represents a required method in a trait declaration,
1030 /// one without a default implementation
1031 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1032 pub struct TypeMethod {
1034 pub attrs: Vec<Attribute>,
1035 pub unsafety: Unsafety,
1037 pub decl: P<FnDecl>,
1038 pub generics: Generics,
1039 pub explicit_self: ExplicitSelf,
1042 pub vis: Visibility,
1045 /// Represents a method declaration in a trait declaration, possibly including
1046 /// a default implementation A trait method is either required (meaning it
1047 /// doesn't have an implementation, just a signature) or provided (meaning it
1048 /// has a default implementation).
1049 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1050 pub enum TraitItem {
1051 RequiredMethod(TypeMethod),
1052 ProvidedMethod(P<Method>),
1053 TypeTraitItem(P<AssociatedType>),
1056 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1058 MethodImplItem(P<Method>),
1059 TypeImplItem(P<Typedef>),
1062 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1063 pub struct AssociatedType {
1064 pub attrs: Vec<Attribute>,
1065 pub ty_param: TyParam,
1068 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1069 pub struct Typedef {
1073 pub vis: Visibility,
1074 pub attrs: Vec<Attribute>,
1078 #[derive(Clone, Eq, RustcEncodable, RustcDecodable, Hash, Copy)]
1080 TyIs(bool /* is this deprecated `int`? */),
1087 impl PartialEq for IntTy {
1088 fn eq(&self, other: &IntTy) -> bool {
1089 match (*self, *other) {
1090 // true/false need to compare the same, so this can't be derived
1091 (TyIs(_), TyIs(_)) |
1095 (TyI64, TyI64) => true,
1101 impl fmt::Show for IntTy {
1102 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1103 fmt::String::fmt(self, f)
1107 impl fmt::String for IntTy {
1108 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1109 write!(f, "{}", ast_util::int_ty_to_string(*self, None))
1114 pub fn suffix_len(&self) -> uint {
1116 TyIs(true) /* i */ => 1,
1117 TyIs(false) /* is */ | TyI8 => 2,
1118 TyI16 | TyI32 | TyI64 => 3,
1123 #[derive(Clone, Eq, RustcEncodable, RustcDecodable, Hash, Copy)]
1125 TyUs(bool /* is this deprecated uint? */),
1132 impl PartialEq for UintTy {
1133 fn eq(&self, other: &UintTy) -> bool {
1134 match (*self, *other) {
1135 // true/false need to compare the same, so this can't be derived
1136 (TyUs(_), TyUs(_)) |
1140 (TyU64, TyU64) => true,
1147 pub fn suffix_len(&self) -> uint {
1149 TyUs(true) /* u */ => 1,
1150 TyUs(false) /* us */ | TyU8 => 2,
1151 TyU16 | TyU32 | TyU64 => 3,
1156 impl fmt::Show for UintTy {
1157 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1158 fmt::String::fmt(self, f)
1162 impl fmt::String for UintTy {
1163 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1164 write!(f, "{}", ast_util::uint_ty_to_string(*self, None))
1168 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Copy)]
1174 impl fmt::Show for FloatTy {
1175 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1176 fmt::String::fmt(self, f)
1180 impl fmt::String for FloatTy {
1181 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1182 write!(f, "{}", ast_util::float_ty_to_string(*self))
1187 pub fn suffix_len(&self) -> uint {
1189 TyF32 | TyF64 => 3, // add F128 handling here
1194 // Bind a type to an associated type: `A=Foo`.
1195 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1196 pub struct TypeBinding {
1204 // NB PartialEq method appears below.
1205 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1212 /// Not represented directly in the AST, referred to by name through a ty_path.
1213 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
1223 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Copy)]
1229 impl fmt::Show for Onceness {
1230 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1231 fmt::String::fmt(match *self {
1238 impl fmt::String for Onceness {
1239 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1240 fmt::String::fmt(match *self {
1247 /// Represents the type of a closure
1248 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1249 pub struct ClosureTy {
1250 pub lifetimes: Vec<LifetimeDef>,
1251 pub unsafety: Unsafety,
1252 pub onceness: Onceness,
1253 pub decl: P<FnDecl>,
1254 pub bounds: TyParamBounds,
1257 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1258 pub struct BareFnTy {
1259 pub unsafety: Unsafety,
1261 pub lifetimes: Vec<LifetimeDef>,
1265 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1266 /// The different kinds of types recognized by the compiler
1269 /// A fixed length array (`[T, ..n]`)
1270 TyFixedLengthVec(P<Ty>, P<Expr>),
1271 /// A raw pointer (`*const T` or `*mut T`)
1273 /// A reference (`&'a T` or `&'a mut T`)
1274 TyRptr(Option<Lifetime>, MutTy),
1275 /// A bare function (e.g. `fn(uint) -> bool`)
1276 TyBareFn(P<BareFnTy>),
1277 /// A tuple (`(A, B, C, D,...)`)
1279 /// A path (`module::module::...::Type`) or primitive
1281 /// Type parameters are stored in the Path itself
1282 TyPath(Path, NodeId),
1283 /// Something like `A+B`. Note that `B` must always be a path.
1284 TyObjectSum(P<Ty>, TyParamBounds),
1285 /// A type like `for<'a> Foo<&'a Bar>`
1286 TyPolyTraitRef(TyParamBounds),
1287 /// A "qualified path", e.g. `<Vec<T> as SomeTrait>::SomeType`
1289 /// No-op; kept solely so that we can pretty-print faithfully
1293 /// TyInfer means the type should be inferred instead of it having been
1294 /// specified. This can appear anywhere in a type.
1298 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
1299 pub enum AsmDialect {
1304 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1305 pub struct InlineAsm {
1306 pub asm: InternedString,
1307 pub asm_str_style: StrStyle,
1308 pub outputs: Vec<(InternedString, P<Expr>, bool)>,
1309 pub inputs: Vec<(InternedString, P<Expr>)>,
1310 pub clobbers: Vec<InternedString>,
1312 pub alignstack: bool,
1313 pub dialect: AsmDialect,
1314 pub expn_id: ExpnId,
1317 /// represents an argument in a function header
1318 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1326 pub fn new_self(span: Span, mutability: Mutability, self_ident: Ident) -> Arg {
1327 let path = Spanned{span:span,node:self_ident};
1329 // HACK(eddyb) fake type for the self argument.
1337 node: PatIdent(BindByValue(mutability), path, None),
1345 /// represents the header (not the body) of a function declaration
1346 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1348 pub inputs: Vec<Arg>,
1349 pub output: FunctionRetTy,
1353 #[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1359 impl fmt::String for Unsafety {
1360 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1361 fmt::String::fmt(match *self {
1362 Unsafety::Normal => "normal",
1363 Unsafety::Unsafe => "unsafe",
1368 #[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash)]
1369 pub enum ImplPolarity {
1370 /// impl Trait for Type
1372 /// impl !Trait for Type
1376 impl fmt::Show for ImplPolarity {
1377 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1379 ImplPolarity::Positive => "positive".fmt(f),
1380 ImplPolarity::Negative => "negative".fmt(f),
1386 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1387 pub enum FunctionRetTy {
1388 /// Functions with return type ! that always
1389 /// raise an error or exit (i.e. never return to the caller)
1395 impl FunctionRetTy {
1396 pub fn span(&self) -> Span {
1398 NoReturn(span) => span,
1399 Return(ref ty) => ty.span
1404 /// Represents the kind of 'self' associated with a method
1405 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1406 pub enum ExplicitSelf_ {
1411 /// `&'lt self`, `&'lt mut self`
1412 SelfRegion(Option<Lifetime>, Mutability, Ident),
1414 SelfExplicit(P<Ty>, Ident),
1417 pub type ExplicitSelf = Spanned<ExplicitSelf_>;
1419 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1421 pub attrs: Vec<Attribute>,
1427 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1429 /// Represents a method declaration
1438 /// Represents a macro in method position
1442 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1444 /// A span from the first token past `{` to the last token until `}`.
1445 /// For `mod foo;`, the inner span ranges from the first token
1446 /// to the last token in the external file.
1448 pub view_items: Vec<ViewItem>,
1449 pub items: Vec<P<Item>>,
1452 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1453 pub struct ForeignMod {
1455 pub view_items: Vec<ViewItem>,
1456 pub items: Vec<P<ForeignItem>>,
1459 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1460 pub struct VariantArg {
1465 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1466 pub enum VariantKind {
1467 TupleVariantKind(Vec<VariantArg>),
1468 StructVariantKind(P<StructDef>),
1471 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1472 pub struct EnumDef {
1473 pub variants: Vec<P<Variant>>,
1476 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1477 pub struct Variant_ {
1479 pub attrs: Vec<Attribute>,
1480 pub kind: VariantKind,
1482 pub disr_expr: Option<P<Expr>>,
1483 pub vis: Visibility,
1486 pub type Variant = Spanned<Variant_>;
1488 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
1489 pub enum PathListItem_ {
1490 PathListIdent { name: Ident, id: NodeId },
1491 PathListMod { id: NodeId }
1494 impl PathListItem_ {
1495 pub fn id(&self) -> NodeId {
1497 PathListIdent { id, .. } | PathListMod { id } => id
1502 pub type PathListItem = Spanned<PathListItem_>;
1504 pub type ViewPath = Spanned<ViewPath_>;
1506 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1507 pub enum ViewPath_ {
1509 /// `foo::bar::baz as quux`
1513 /// `foo::bar::baz` (with `as baz` implicitly on the right)
1514 ViewPathSimple(Ident, Path, NodeId),
1517 ViewPathGlob(Path, NodeId),
1519 /// `foo::bar::{a,b,c}`
1520 ViewPathList(Path, Vec<PathListItem> , NodeId)
1523 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1524 pub struct ViewItem {
1525 pub node: ViewItem_,
1526 pub attrs: Vec<Attribute>,
1527 pub vis: Visibility,
1532 pub fn id(&self) -> NodeId {
1534 ViewItemExternCrate(_, _, id) => id,
1535 ViewItemUse(ref vp) => match vp.node {
1536 ViewPathSimple(_, _, id) => id,
1537 ViewPathGlob(_, id) => id,
1538 ViewPathList(_, _, id) => id,
1544 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1545 pub enum ViewItem_ {
1546 /// Ident: name used to refer to this crate in the code
1547 /// optional (InternedString,StrStyle): if present, this is a location
1548 /// (containing arbitrary characters) from which to fetch the crate sources
1549 /// For example, extern crate whatever = "github.com/rust-lang/rust"
1550 ViewItemExternCrate(Ident, Option<(InternedString,StrStyle)>, NodeId),
1551 ViewItemUse(P<ViewPath>),
1554 /// Meta-data associated with an item
1555 pub type Attribute = Spanned<Attribute_>;
1557 /// Distinguishes between Attributes that decorate items and Attributes that
1558 /// are contained as statements within items. These two cases need to be
1559 /// distinguished for pretty-printing.
1560 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
1561 pub enum AttrStyle {
1566 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
1567 pub struct AttrId(pub uint);
1569 /// Doc-comments are promoted to attributes that have is_sugared_doc = true
1570 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1571 pub struct Attribute_ {
1573 pub style: AttrStyle,
1574 pub value: P<MetaItem>,
1575 pub is_sugared_doc: bool,
1578 /// TraitRef's appear in impls.
1579 /// resolve maps each TraitRef's ref_id to its defining trait; that's all
1580 /// that the ref_id is for. The impl_id maps to the "self type" of this impl.
1581 /// If this impl is an ItemImpl, the impl_id is redundant (it could be the
1582 /// same as the impl's node id).
1583 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1584 pub struct TraitRef {
1589 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1590 pub struct PolyTraitRef {
1591 /// The `'a` in `<'a> Foo<&'a T>`
1592 pub bound_lifetimes: Vec<LifetimeDef>,
1594 /// The `Foo<&'a T>` in `<'a> Foo<&'a T>`
1595 pub trait_ref: TraitRef,
1598 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
1599 pub enum Visibility {
1605 pub fn inherit_from(&self, parent_visibility: Visibility) -> Visibility {
1607 &Inherited => parent_visibility,
1613 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1614 pub struct StructField_ {
1615 pub kind: StructFieldKind,
1618 pub attrs: Vec<Attribute>,
1622 pub fn ident(&self) -> Option<Ident> {
1624 NamedField(ref ident, _) => Some(ident.clone()),
1625 UnnamedField(_) => None
1630 pub type StructField = Spanned<StructField_>;
1632 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
1633 pub enum StructFieldKind {
1634 NamedField(Ident, Visibility),
1635 /// Element of a tuple-like struct
1636 UnnamedField(Visibility),
1639 impl StructFieldKind {
1640 pub fn is_unnamed(&self) -> bool {
1642 UnnamedField(..) => true,
1643 NamedField(..) => false,
1648 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1649 pub struct StructDef {
1650 /// Fields, not including ctor
1651 pub fields: Vec<StructField>,
1652 /// ID of the constructor. This is only used for tuple- or enum-like
1654 pub ctor_id: Option<NodeId>,
1658 FIXME (#3300): Should allow items to be anonymous. Right now
1659 we just use dummy names for anon items.
1661 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1664 pub attrs: Vec<Attribute>,
1667 pub vis: Visibility,
1671 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1673 ItemStatic(P<Ty>, Mutability, P<Expr>),
1674 ItemConst(P<Ty>, P<Expr>),
1675 ItemFn(P<FnDecl>, Unsafety, Abi, Generics, P<Block>),
1677 ItemForeignMod(ForeignMod),
1678 ItemTy(P<Ty>, Generics),
1679 ItemEnum(EnumDef, Generics),
1680 ItemStruct(P<StructDef>, Generics),
1681 /// Represents a Trait Declaration
1689 Option<TraitRef>, // (optional) trait this impl implements
1692 /// A macro invocation (which includes macro definition)
1697 pub fn descriptive_variant(&self) -> &str {
1699 ItemStatic(..) => "static item",
1700 ItemConst(..) => "constant item",
1701 ItemFn(..) => "function",
1702 ItemMod(..) => "module",
1703 ItemForeignMod(..) => "foreign module",
1704 ItemTy(..) => "type alias",
1705 ItemEnum(..) => "enum",
1706 ItemStruct(..) => "struct",
1707 ItemTrait(..) => "trait",
1709 ItemImpl(..) => "item"
1714 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1715 pub struct ForeignItem {
1717 pub attrs: Vec<Attribute>,
1718 pub node: ForeignItem_,
1721 pub vis: Visibility,
1724 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1725 pub enum ForeignItem_ {
1726 ForeignItemFn(P<FnDecl>, Generics),
1727 ForeignItemStatic(P<Ty>, /* is_mutbl */ bool),
1731 pub fn descriptive_variant(&self) -> &str {
1733 ForeignItemFn(..) => "foreign function",
1734 ForeignItemStatic(..) => "foreign static item"
1739 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
1740 pub enum UnboxedClosureKind {
1741 FnUnboxedClosureKind,
1742 FnMutUnboxedClosureKind,
1743 FnOnceUnboxedClosureKind,
1746 /// The data we save and restore about an inlined item or method. This is not
1747 /// part of the AST that we parse from a file, but it becomes part of the tree
1749 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1750 pub enum InlinedItem {
1752 IITraitItem(DefId /* impl id */, TraitItem),
1753 IIImplItem(DefId /* impl id */, ImplItem),
1754 IIForeign(P<ForeignItem>),
1757 /// A macro definition, in this crate or imported from another.
1759 /// Not parsed directly, but created on macro import or `macro_rules!` expansion.
1760 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1761 pub struct MacroDef {
1763 pub attrs: Vec<Attribute>,
1766 pub imported_from: Option<Ident>,
1768 pub use_locally: bool,
1769 pub body: Vec<TokenTree>,
1777 // are ASTs encodable?
1779 fn check_asts_encodable() {
1780 fn assert_encodable<T: serialize::Encodable>() {}
1781 assert_encodable::<Crate>();