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>
750 /// A "qualified path", e.g. `<Vec<T> as SomeTrait>::SomeType`
753 ExprAddrOf(Mutability, P<Expr>),
754 ExprBreak(Option<Ident>),
755 ExprAgain(Option<Ident>),
756 ExprRet(Option<P<Expr>>),
758 ExprInlineAsm(InlineAsm),
762 /// A struct literal expression.
763 ExprStruct(Path, Vec<Field>, Option<P<Expr>> /* base */),
765 /// A vector literal constructed from one repeated element.
766 ExprRepeat(P<Expr> /* element */, P<Expr> /* count */),
768 /// No-op: used solely so we can pretty-print faithfully
772 /// A "qualified path":
774 /// <Vec<T> as SomeTrait>::SomeAssociatedItem
775 /// ^~~~~ ^~~~~~~~~ ^~~~~~~~~~~~~~~~~~
776 /// self_type trait_name item_path
777 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
779 pub self_type: P<Ty>,
780 pub trait_ref: P<TraitRef>,
781 pub item_path: PathSegment,
784 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
785 pub enum MatchSource {
787 IfLetDesugar { contains_else_clause: bool },
791 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
792 pub enum CaptureClause {
797 /// A delimited sequence of token trees
798 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
799 pub struct Delimited {
800 /// The type of delimiter
801 pub delim: token::DelimToken,
802 /// The span covering the opening delimiter
804 /// The delimited sequence of token trees
805 pub tts: Vec<TokenTree>,
806 /// The span covering the closing delimiter
807 pub close_span: Span,
811 /// Returns the opening delimiter as a token.
812 pub fn open_token(&self) -> token::Token {
813 token::OpenDelim(self.delim)
816 /// Returns the closing delimiter as a token.
817 pub fn close_token(&self) -> token::Token {
818 token::CloseDelim(self.delim)
821 /// Returns the opening delimiter as a token tree.
822 pub fn open_tt(&self) -> TokenTree {
823 TtToken(self.open_span, self.open_token())
826 /// Returns the closing delimiter as a token tree.
827 pub fn close_tt(&self) -> TokenTree {
828 TtToken(self.close_span, self.close_token())
832 /// A sequence of token treesee
833 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
834 pub struct SequenceRepetition {
835 /// The sequence of token trees
836 pub tts: Vec<TokenTree>,
837 /// The optional separator
838 pub separator: Option<token::Token>,
839 /// Whether the sequence can be repeated zero (*), or one or more times (+)
841 /// The number of `MatchNt`s that appear in the sequence (and subsequences)
842 pub num_captures: uint,
845 /// A Kleene-style [repetition operator](http://en.wikipedia.org/wiki/Kleene_star)
846 /// for token sequences.
847 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
853 /// When the main rust parser encounters a syntax-extension invocation, it
854 /// parses the arguments to the invocation as a token-tree. This is a very
855 /// loose structure, such that all sorts of different AST-fragments can
856 /// be passed to syntax extensions using a uniform type.
858 /// If the syntax extension is an MBE macro, it will attempt to match its
859 /// LHS token tree against the provided token tree, and if it finds a
860 /// match, will transcribe the RHS token tree, splicing in any captured
861 /// macro_parser::matched_nonterminals into the `SubstNt`s it finds.
863 /// The RHS of an MBE macro is the only place `SubstNt`s are substituted.
864 /// Nothing special happens to misnamed or misplaced `SubstNt`s.
865 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
866 #[doc="For macro invocations; parsing is delegated to the macro"]
869 TtToken(Span, token::Token),
870 /// A delimited sequence of token trees
871 TtDelimited(Span, Rc<Delimited>),
873 // This only makes sense in MBE macros.
875 /// A kleene-style repetition sequence with a span
876 // FIXME(eddyb) #12938 Use DST.
877 TtSequence(Span, Rc<SequenceRepetition>),
881 pub fn len(&self) -> uint {
883 TtToken(_, token::DocComment(_)) => 2,
884 TtToken(_, token::SpecialVarNt(..)) => 2,
885 TtToken(_, token::MatchNt(..)) => 3,
886 TtDelimited(_, ref delimed) => {
887 delimed.tts.len() + 2
889 TtSequence(_, ref seq) => {
896 pub fn get_tt(&self, index: uint) -> TokenTree {
897 match (self, index) {
898 (&TtToken(sp, token::DocComment(_)), 0) => {
899 TtToken(sp, token::Pound)
901 (&TtToken(sp, token::DocComment(name)), 1) => {
902 TtDelimited(sp, Rc::new(Delimited {
903 delim: token::Bracket,
905 tts: vec![TtToken(sp, token::Ident(token::str_to_ident("doc"),
907 TtToken(sp, token::Eq),
908 TtToken(sp, token::Literal(token::Str_(name), None))],
912 (&TtDelimited(_, ref delimed), _) => {
914 return delimed.open_tt();
916 if index == delimed.tts.len() + 1 {
917 return delimed.close_tt();
919 delimed.tts[index - 1].clone()
921 (&TtToken(sp, token::SpecialVarNt(var)), _) => {
922 let v = [TtToken(sp, token::Dollar),
923 TtToken(sp, token::Ident(token::str_to_ident(var.as_str()),
927 (&TtToken(sp, token::MatchNt(name, kind, name_st, kind_st)), _) => {
928 let v = [TtToken(sp, token::SubstNt(name, name_st)),
929 TtToken(sp, token::Colon),
930 TtToken(sp, token::Ident(kind, kind_st))];
933 (&TtSequence(_, ref seq), _) => {
934 seq.tts[index].clone()
936 _ => panic!("Cannot expand a token tree")
940 /// Returns the `Span` corresponding to this token tree.
941 pub fn get_span(&self) -> Span {
943 TtToken(span, _) => span,
944 TtDelimited(span, _) => span,
945 TtSequence(span, _) => span,
950 pub type Mac = Spanned<Mac_>;
952 /// Represents a macro invocation. The Path indicates which macro
953 /// is being invoked, and the vector of token-trees contains the source
954 /// of the macro invocation.
955 /// There's only one flavor, now, so this could presumably be simplified.
956 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
958 // NB: the additional ident for a macro_rules-style macro is actually
959 // stored in the enclosing item. Oog.
960 MacInvocTT(Path, Vec<TokenTree>, SyntaxContext), // new macro-invocation
963 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
969 pub type Lit = Spanned<Lit_>;
971 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
978 pub fn new<T:Int>(n: T) -> Sign {
987 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
988 pub enum LitIntType {
989 SignedIntLit(IntTy, Sign),
990 UnsignedIntLit(UintTy),
991 UnsuffixedIntLit(Sign)
995 pub fn suffix_len(&self) -> uint {
997 UnsuffixedIntLit(_) => 0,
998 SignedIntLit(s, _) => s.suffix_len(),
999 UnsignedIntLit(u) => u.suffix_len()
1004 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1006 LitStr(InternedString, StrStyle),
1007 LitBinary(Rc<Vec<u8>>),
1010 LitInt(u64, LitIntType),
1011 LitFloat(InternedString, FloatTy),
1012 LitFloatUnsuffixed(InternedString),
1016 // NB: If you change this, you'll probably want to change the corresponding
1017 // type structure in middle/ty.rs as well.
1018 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1021 pub mutbl: Mutability,
1024 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1025 pub struct TypeField {
1031 /// Represents a required method in a trait declaration,
1032 /// one without a default implementation
1033 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1034 pub struct TypeMethod {
1036 pub attrs: Vec<Attribute>,
1037 pub unsafety: Unsafety,
1039 pub decl: P<FnDecl>,
1040 pub generics: Generics,
1041 pub explicit_self: ExplicitSelf,
1044 pub vis: Visibility,
1047 /// Represents a method declaration in a trait declaration, possibly including
1048 /// a default implementation A trait method is either required (meaning it
1049 /// doesn't have an implementation, just a signature) or provided (meaning it
1050 /// has a default implementation).
1051 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1052 pub enum TraitItem {
1053 RequiredMethod(TypeMethod),
1054 ProvidedMethod(P<Method>),
1055 TypeTraitItem(P<AssociatedType>),
1058 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1060 MethodImplItem(P<Method>),
1061 TypeImplItem(P<Typedef>),
1064 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1065 pub struct AssociatedType {
1066 pub attrs: Vec<Attribute>,
1067 pub ty_param: TyParam,
1070 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1071 pub struct Typedef {
1075 pub vis: Visibility,
1076 pub attrs: Vec<Attribute>,
1080 #[derive(Clone, Eq, RustcEncodable, RustcDecodable, Hash, Copy)]
1082 TyIs(bool /* is this deprecated `int`? */),
1089 impl PartialEq for IntTy {
1090 fn eq(&self, other: &IntTy) -> bool {
1091 match (*self, *other) {
1092 // true/false need to compare the same, so this can't be derived
1093 (TyIs(_), TyIs(_)) |
1097 (TyI64, TyI64) => true,
1103 impl fmt::Show for IntTy {
1104 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1105 fmt::String::fmt(self, f)
1109 impl fmt::String for IntTy {
1110 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1111 write!(f, "{}", ast_util::int_ty_to_string(*self, None))
1116 pub fn suffix_len(&self) -> uint {
1118 TyIs(true) /* i */ => 1,
1119 TyIs(false) /* is */ | TyI8 => 2,
1120 TyI16 | TyI32 | TyI64 => 3,
1125 #[derive(Clone, Eq, RustcEncodable, RustcDecodable, Hash, Copy)]
1127 TyUs(bool /* is this deprecated uint? */),
1134 impl PartialEq for UintTy {
1135 fn eq(&self, other: &UintTy) -> bool {
1136 match (*self, *other) {
1137 // true/false need to compare the same, so this can't be derived
1138 (TyUs(_), TyUs(_)) |
1142 (TyU64, TyU64) => true,
1149 pub fn suffix_len(&self) -> uint {
1151 TyUs(true) /* u */ => 1,
1152 TyUs(false) /* us */ | TyU8 => 2,
1153 TyU16 | TyU32 | TyU64 => 3,
1158 impl fmt::Show for UintTy {
1159 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1160 fmt::String::fmt(self, f)
1164 impl fmt::String for UintTy {
1165 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1166 write!(f, "{}", ast_util::uint_ty_to_string(*self, None))
1170 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Copy)]
1176 impl fmt::Show for FloatTy {
1177 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1178 fmt::String::fmt(self, f)
1182 impl fmt::String for FloatTy {
1183 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1184 write!(f, "{}", ast_util::float_ty_to_string(*self))
1189 pub fn suffix_len(&self) -> uint {
1191 TyF32 | TyF64 => 3, // add F128 handling here
1196 // Bind a type to an associated type: `A=Foo`.
1197 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1198 pub struct TypeBinding {
1206 // NB PartialEq method appears below.
1207 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1214 /// Not represented directly in the AST, referred to by name through a ty_path.
1215 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
1225 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Copy)]
1231 impl fmt::Show for Onceness {
1232 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1233 fmt::String::fmt(match *self {
1240 impl fmt::String for Onceness {
1241 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1242 fmt::String::fmt(match *self {
1249 /// Represents the type of a closure
1250 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1251 pub struct ClosureTy {
1252 pub lifetimes: Vec<LifetimeDef>,
1253 pub unsafety: Unsafety,
1254 pub onceness: Onceness,
1255 pub decl: P<FnDecl>,
1256 pub bounds: TyParamBounds,
1259 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1260 pub struct BareFnTy {
1261 pub unsafety: Unsafety,
1263 pub lifetimes: Vec<LifetimeDef>,
1267 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1268 /// The different kinds of types recognized by the compiler
1271 /// A fixed length array (`[T, ..n]`)
1272 TyFixedLengthVec(P<Ty>, P<Expr>),
1273 /// A raw pointer (`*const T` or `*mut T`)
1275 /// A reference (`&'a T` or `&'a mut T`)
1276 TyRptr(Option<Lifetime>, MutTy),
1277 /// A bare function (e.g. `fn(uint) -> bool`)
1278 TyBareFn(P<BareFnTy>),
1279 /// A tuple (`(A, B, C, D,...)`)
1281 /// A path (`module::module::...::Type`) or primitive
1283 /// Type parameters are stored in the Path itself
1284 TyPath(Path, NodeId),
1285 /// Something like `A+B`. Note that `B` must always be a path.
1286 TyObjectSum(P<Ty>, TyParamBounds),
1287 /// A type like `for<'a> Foo<&'a Bar>`
1288 TyPolyTraitRef(TyParamBounds),
1289 /// A "qualified path", e.g. `<Vec<T> as SomeTrait>::SomeType`
1291 /// No-op; kept solely so that we can pretty-print faithfully
1295 /// TyInfer means the type should be inferred instead of it having been
1296 /// specified. This can appear anywhere in a type.
1300 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
1301 pub enum AsmDialect {
1306 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1307 pub struct InlineAsm {
1308 pub asm: InternedString,
1309 pub asm_str_style: StrStyle,
1310 pub outputs: Vec<(InternedString, P<Expr>, bool)>,
1311 pub inputs: Vec<(InternedString, P<Expr>)>,
1312 pub clobbers: Vec<InternedString>,
1314 pub alignstack: bool,
1315 pub dialect: AsmDialect,
1316 pub expn_id: ExpnId,
1319 /// represents an argument in a function header
1320 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1328 pub fn new_self(span: Span, mutability: Mutability, self_ident: Ident) -> Arg {
1329 let path = Spanned{span:span,node:self_ident};
1331 // HACK(eddyb) fake type for the self argument.
1339 node: PatIdent(BindByValue(mutability), path, None),
1347 /// represents the header (not the body) of a function declaration
1348 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1350 pub inputs: Vec<Arg>,
1351 pub output: FunctionRetTy,
1355 #[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1361 impl fmt::String for Unsafety {
1362 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1363 fmt::String::fmt(match *self {
1364 Unsafety::Normal => "normal",
1365 Unsafety::Unsafe => "unsafe",
1370 #[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash)]
1371 pub enum ImplPolarity {
1372 /// impl Trait for Type
1374 /// impl !Trait for Type
1378 impl fmt::Show for ImplPolarity {
1379 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1381 ImplPolarity::Positive => "positive".fmt(f),
1382 ImplPolarity::Negative => "negative".fmt(f),
1388 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1389 pub enum FunctionRetTy {
1390 /// Functions with return type ! that always
1391 /// raise an error or exit (i.e. never return to the caller)
1393 /// Return type is not specified. Functions default to () and
1394 /// closures default to inference. Span points to where return
1395 /// type would be inserted.
1396 DefaultReturn(Span),
1401 impl FunctionRetTy {
1402 pub fn span(&self) -> Span {
1404 NoReturn(span) => span,
1405 DefaultReturn(span) => span,
1406 Return(ref ty) => ty.span
1411 /// Represents the kind of 'self' associated with a method
1412 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1413 pub enum ExplicitSelf_ {
1418 /// `&'lt self`, `&'lt mut self`
1419 SelfRegion(Option<Lifetime>, Mutability, Ident),
1421 SelfExplicit(P<Ty>, Ident),
1424 pub type ExplicitSelf = Spanned<ExplicitSelf_>;
1426 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1428 pub attrs: Vec<Attribute>,
1434 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1436 /// Represents a method declaration
1445 /// Represents a macro in method position
1449 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1451 /// A span from the first token past `{` to the last token until `}`.
1452 /// For `mod foo;`, the inner span ranges from the first token
1453 /// to the last token in the external file.
1455 pub view_items: Vec<ViewItem>,
1456 pub items: Vec<P<Item>>,
1459 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1460 pub struct ForeignMod {
1462 pub view_items: Vec<ViewItem>,
1463 pub items: Vec<P<ForeignItem>>,
1466 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1467 pub struct VariantArg {
1472 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1473 pub enum VariantKind {
1474 TupleVariantKind(Vec<VariantArg>),
1475 StructVariantKind(P<StructDef>),
1478 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1479 pub struct EnumDef {
1480 pub variants: Vec<P<Variant>>,
1483 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1484 pub struct Variant_ {
1486 pub attrs: Vec<Attribute>,
1487 pub kind: VariantKind,
1489 pub disr_expr: Option<P<Expr>>,
1490 pub vis: Visibility,
1493 pub type Variant = Spanned<Variant_>;
1495 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
1496 pub enum PathListItem_ {
1497 PathListIdent { name: Ident, id: NodeId },
1498 PathListMod { id: NodeId }
1501 impl PathListItem_ {
1502 pub fn id(&self) -> NodeId {
1504 PathListIdent { id, .. } | PathListMod { id } => id
1509 pub type PathListItem = Spanned<PathListItem_>;
1511 pub type ViewPath = Spanned<ViewPath_>;
1513 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1514 pub enum ViewPath_ {
1516 /// `foo::bar::baz as quux`
1520 /// `foo::bar::baz` (with `as baz` implicitly on the right)
1521 ViewPathSimple(Ident, Path, NodeId),
1524 ViewPathGlob(Path, NodeId),
1526 /// `foo::bar::{a,b,c}`
1527 ViewPathList(Path, Vec<PathListItem> , NodeId)
1530 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1531 pub struct ViewItem {
1532 pub node: ViewItem_,
1533 pub attrs: Vec<Attribute>,
1534 pub vis: Visibility,
1539 pub fn id(&self) -> NodeId {
1541 ViewItemExternCrate(_, _, id) => id,
1542 ViewItemUse(ref vp) => match vp.node {
1543 ViewPathSimple(_, _, id) => id,
1544 ViewPathGlob(_, id) => id,
1545 ViewPathList(_, _, id) => id,
1551 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1552 pub enum ViewItem_ {
1553 /// Ident: name used to refer to this crate in the code
1554 /// optional (InternedString,StrStyle): if present, this is a location
1555 /// (containing arbitrary characters) from which to fetch the crate sources
1556 /// For example, extern crate whatever = "github.com/rust-lang/rust"
1557 ViewItemExternCrate(Ident, Option<(InternedString,StrStyle)>, NodeId),
1558 ViewItemUse(P<ViewPath>),
1561 /// Meta-data associated with an item
1562 pub type Attribute = Spanned<Attribute_>;
1564 /// Distinguishes between Attributes that decorate items and Attributes that
1565 /// are contained as statements within items. These two cases need to be
1566 /// distinguished for pretty-printing.
1567 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
1568 pub enum AttrStyle {
1573 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
1574 pub struct AttrId(pub uint);
1576 /// Doc-comments are promoted to attributes that have is_sugared_doc = true
1577 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1578 pub struct Attribute_ {
1580 pub style: AttrStyle,
1581 pub value: P<MetaItem>,
1582 pub is_sugared_doc: bool,
1585 /// TraitRef's appear in impls.
1586 /// resolve maps each TraitRef's ref_id to its defining trait; that's all
1587 /// that the ref_id is for. The impl_id maps to the "self type" of this impl.
1588 /// If this impl is an ItemImpl, the impl_id is redundant (it could be the
1589 /// same as the impl's node id).
1590 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1591 pub struct TraitRef {
1596 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1597 pub struct PolyTraitRef {
1598 /// The `'a` in `<'a> Foo<&'a T>`
1599 pub bound_lifetimes: Vec<LifetimeDef>,
1601 /// The `Foo<&'a T>` in `<'a> Foo<&'a T>`
1602 pub trait_ref: TraitRef,
1605 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
1606 pub enum Visibility {
1612 pub fn inherit_from(&self, parent_visibility: Visibility) -> Visibility {
1614 &Inherited => parent_visibility,
1620 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1621 pub struct StructField_ {
1622 pub kind: StructFieldKind,
1625 pub attrs: Vec<Attribute>,
1629 pub fn ident(&self) -> Option<Ident> {
1631 NamedField(ref ident, _) => Some(ident.clone()),
1632 UnnamedField(_) => None
1637 pub type StructField = Spanned<StructField_>;
1639 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
1640 pub enum StructFieldKind {
1641 NamedField(Ident, Visibility),
1642 /// Element of a tuple-like struct
1643 UnnamedField(Visibility),
1646 impl StructFieldKind {
1647 pub fn is_unnamed(&self) -> bool {
1649 UnnamedField(..) => true,
1650 NamedField(..) => false,
1655 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1656 pub struct StructDef {
1657 /// Fields, not including ctor
1658 pub fields: Vec<StructField>,
1659 /// ID of the constructor. This is only used for tuple- or enum-like
1661 pub ctor_id: Option<NodeId>,
1665 FIXME (#3300): Should allow items to be anonymous. Right now
1666 we just use dummy names for anon items.
1668 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1671 pub attrs: Vec<Attribute>,
1674 pub vis: Visibility,
1678 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1680 ItemStatic(P<Ty>, Mutability, P<Expr>),
1681 ItemConst(P<Ty>, P<Expr>),
1682 ItemFn(P<FnDecl>, Unsafety, Abi, Generics, P<Block>),
1684 ItemForeignMod(ForeignMod),
1685 ItemTy(P<Ty>, Generics),
1686 ItemEnum(EnumDef, Generics),
1687 ItemStruct(P<StructDef>, Generics),
1688 /// Represents a Trait Declaration
1696 Option<TraitRef>, // (optional) trait this impl implements
1699 /// A macro invocation (which includes macro definition)
1704 pub fn descriptive_variant(&self) -> &str {
1706 ItemStatic(..) => "static item",
1707 ItemConst(..) => "constant item",
1708 ItemFn(..) => "function",
1709 ItemMod(..) => "module",
1710 ItemForeignMod(..) => "foreign module",
1711 ItemTy(..) => "type alias",
1712 ItemEnum(..) => "enum",
1713 ItemStruct(..) => "struct",
1714 ItemTrait(..) => "trait",
1716 ItemImpl(..) => "item"
1721 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1722 pub struct ForeignItem {
1724 pub attrs: Vec<Attribute>,
1725 pub node: ForeignItem_,
1728 pub vis: Visibility,
1731 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1732 pub enum ForeignItem_ {
1733 ForeignItemFn(P<FnDecl>, Generics),
1734 ForeignItemStatic(P<Ty>, /* is_mutbl */ bool),
1738 pub fn descriptive_variant(&self) -> &str {
1740 ForeignItemFn(..) => "foreign function",
1741 ForeignItemStatic(..) => "foreign static item"
1746 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
1747 pub enum UnboxedClosureKind {
1748 FnUnboxedClosureKind,
1749 FnMutUnboxedClosureKind,
1750 FnOnceUnboxedClosureKind,
1753 /// The data we save and restore about an inlined item or method. This is not
1754 /// part of the AST that we parse from a file, but it becomes part of the tree
1756 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1757 pub enum InlinedItem {
1759 IITraitItem(DefId /* impl id */, TraitItem),
1760 IIImplItem(DefId /* impl id */, ImplItem),
1761 IIForeign(P<ForeignItem>),
1764 /// A macro definition, in this crate or imported from another.
1766 /// Not parsed directly, but created on macro import or `macro_rules!` expansion.
1767 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
1768 pub struct MacroDef {
1770 pub attrs: Vec<Attribute>,
1773 pub imported_from: Option<Ident>,
1775 pub use_locally: bool,
1776 pub body: Vec<TokenTree>,
1784 // are ASTs encodable?
1786 fn check_asts_encodable() {
1787 fn assert_encodable<T: serialize::Encodable>() {}
1788 assert_encodable::<Crate>();