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::AttrStyle::*;
14 pub use self::BindingMode::*;
15 pub use self::BinOp_::*;
16 pub use self::BlockCheckMode::*;
17 pub use self::CaptureClause::*;
18 pub use self::Decl_::*;
19 pub use self::ExplicitSelf_::*;
20 pub use self::Expr_::*;
21 pub use self::FloatTy::*;
22 pub use self::FunctionRetTy::*;
23 pub use self::ForeignItem_::*;
24 pub use self::ImplItem_::*;
25 pub use self::IntTy::*;
26 pub use self::Item_::*;
27 pub use self::KleeneOp::*;
28 pub use self::Lit_::*;
29 pub use self::LitIntType::*;
30 pub use self::MacStmtStyle::*;
31 pub use self::MetaItem_::*;
32 pub use self::Mutability::*;
33 pub use self::Pat_::*;
34 pub use self::PathListItem_::*;
35 pub use self::PatWildKind::*;
36 pub use self::PrimTy::*;
37 pub use self::Sign::*;
38 pub use self::Stmt_::*;
39 pub use self::StrStyle::*;
40 pub use self::StructFieldKind::*;
41 pub use self::TokenTree::*;
42 pub use self::TraitItem_::*;
44 pub use self::TyParamBound::*;
45 pub use self::UintTy::*;
46 pub use self::UnOp::*;
47 pub use self::UnsafeSource::*;
48 pub use self::VariantKind::*;
49 pub use self::ViewPath_::*;
50 pub use self::Visibility::*;
51 pub use self::PathParameters::*;
53 use codemap::{Span, Spanned, DUMMY_SP, ExpnId};
57 use ext::tt::macro_parser;
58 use owned_slice::OwnedSlice;
59 use parse::token::{InternedString, str_to_ident};
62 use parse::lexer::comments::{doc_comment_style, strip_doc_comment_decoration};
69 use serialize::{Encodable, Decodable, Encoder, Decoder};
71 // FIXME #6993: in librustc, uses of "ident" should be replaced
74 /// An identifier contains a Name (index into the interner
75 /// table) and a SyntaxContext to track renaming and
76 /// macro expansion per Flatt et al., "Macros
77 /// That Work Together"
78 #[derive(Clone, Copy, Hash, PartialOrd, Eq, Ord)]
81 pub ctxt: SyntaxContext
85 /// Construct an identifier with the given name and an empty context:
86 pub fn new(name: Name) -> Ident { Ident {name: name, ctxt: EMPTY_CTXT}}
89 impl fmt::Debug for Ident {
90 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
91 write!(f, "{}#{}", self.name, self.ctxt)
95 impl fmt::Display for Ident {
96 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
97 fmt::Display::fmt(&self.name, f)
101 impl fmt::Debug for Name {
102 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
103 let Name(nm) = *self;
104 write!(f, "{}({})", self, nm)
108 impl fmt::Display for Name {
109 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
110 fmt::Display::fmt(&self.as_str(), f)
114 impl PartialEq for Ident {
115 fn eq(&self, other: &Ident) -> bool {
116 if self.ctxt == other.ctxt {
117 self.name == other.name
119 // IF YOU SEE ONE OF THESE FAILS: it means that you're comparing
120 // idents that have different contexts. You can't fix this without
121 // knowing whether the comparison should be hygienic or non-hygienic.
122 // if it should be non-hygienic (most things are), just compare the
123 // 'name' fields of the idents. Or, even better, replace the idents
126 // On the other hand, if the comparison does need to be hygienic,
127 // one example and its non-hygienic counterpart would be:
128 // syntax::parse::token::Token::mtwt_eq
129 // syntax::ext::tt::macro_parser::token_name_eq
130 panic!("not allowed to compare these idents: {:?}, {:?}. \
131 Probably related to issue \\#6993", self, other);
136 /// A SyntaxContext represents a chain of macro-expandings
137 /// and renamings. Each macro expansion corresponds to
140 // I'm representing this syntax context as an index into
141 // a table, in order to work around a compiler bug
142 // that's causing unreleased memory to cause core dumps
143 // and also perhaps to save some work in destructor checks.
144 // the special uint '0' will be used to indicate an empty
147 // this uint is a reference to a table stored in thread-local
149 pub type SyntaxContext = u32;
150 pub const EMPTY_CTXT : SyntaxContext = 0;
151 pub const ILLEGAL_CTXT : SyntaxContext = 1;
153 /// A name is a part of an identifier, representing a string or gensym. It's
154 /// the result of interning.
155 #[derive(Eq, Ord, PartialEq, PartialOrd, Hash,
156 RustcEncodable, RustcDecodable, Clone, Copy)]
157 pub struct Name(pub u32);
159 impl<T: AsRef<str>> PartialEq<T> for Name {
160 fn eq(&self, other: &T) -> bool {
161 self.as_str() == other.as_ref()
166 pub fn as_str(&self) -> token::InternedString {
167 token::InternedString::new_from_name(*self)
170 pub fn usize(&self) -> usize {
171 let Name(nm) = *self;
175 pub fn ident(&self) -> Ident {
176 Ident { name: *self, ctxt: 0 }
180 /// A mark represents a unique id associated with a macro expansion
183 impl Encodable for Ident {
184 fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
185 s.emit_str(&self.name.as_str())
189 impl Decodable for Ident {
190 fn decode<D: Decoder>(d: &mut D) -> Result<Ident, D::Error> {
191 Ok(str_to_ident(&try!(d.read_str())[..]))
195 /// Function name (not all functions have names)
196 pub type FnIdent = Option<Ident>;
198 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Copy)]
199 pub struct Lifetime {
205 impl fmt::Debug for Lifetime {
206 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
207 write!(f, "lifetime({}: {})", self.id, pprust::lifetime_to_string(self))
211 /// A lifetime definition, eg `'a: 'b+'c+'d`
212 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
213 pub struct LifetimeDef {
214 pub lifetime: Lifetime,
215 pub bounds: Vec<Lifetime>
218 /// A "Path" is essentially Rust's notion of a name; for instance:
219 /// std::cmp::PartialEq . It's represented as a sequence of identifiers,
220 /// along with a bunch of supporting information.
221 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash)]
224 /// A `::foo` path, is relative to the crate root rather than current
225 /// module (like paths in an import).
227 /// The segments in the path: the things separated by `::`.
228 pub segments: Vec<PathSegment>,
231 impl fmt::Debug for Path {
232 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
233 write!(f, "path({})", pprust::path_to_string(self))
237 impl fmt::Display for Path {
238 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
239 write!(f, "{}", pprust::path_to_string(self))
243 /// A segment of a path: an identifier, an optional lifetime, and a set of
245 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
246 pub struct PathSegment {
247 /// The identifier portion of this path segment.
248 pub identifier: Ident,
250 /// Type/lifetime parameters attached to this path. They come in
251 /// two flavors: `Path<A,B,C>` and `Path(A,B) -> C`. Note that
252 /// this is more than just simple syntactic sugar; the use of
253 /// parens affects the region binding rules, so we preserve the
255 pub parameters: PathParameters,
258 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
259 pub enum PathParameters {
260 /// The `<'a, A,B,C>` in `foo::bar::baz::<'a, A,B,C>`
261 AngleBracketedParameters(AngleBracketedParameterData),
262 /// The `(A,B)` and `C` in `Foo(A,B) -> C`
263 ParenthesizedParameters(ParenthesizedParameterData),
266 impl PathParameters {
267 pub fn none() -> PathParameters {
268 AngleBracketedParameters(AngleBracketedParameterData {
269 lifetimes: Vec::new(),
270 types: OwnedSlice::empty(),
271 bindings: OwnedSlice::empty(),
275 pub fn is_empty(&self) -> bool {
277 AngleBracketedParameters(ref data) => data.is_empty(),
279 // Even if the user supplied no types, something like
280 // `X()` is equivalent to `X<(),()>`.
281 ParenthesizedParameters(..) => false,
285 pub fn has_lifetimes(&self) -> bool {
287 AngleBracketedParameters(ref data) => !data.lifetimes.is_empty(),
288 ParenthesizedParameters(_) => false,
292 pub fn has_types(&self) -> bool {
294 AngleBracketedParameters(ref data) => !data.types.is_empty(),
295 ParenthesizedParameters(..) => true,
299 /// Returns the types that the user wrote. Note that these do not necessarily map to the type
300 /// parameters in the parenthesized case.
301 pub fn types(&self) -> Vec<&P<Ty>> {
303 AngleBracketedParameters(ref data) => {
304 data.types.iter().collect()
306 ParenthesizedParameters(ref data) => {
308 .chain(data.output.iter())
314 pub fn lifetimes(&self) -> Vec<&Lifetime> {
316 AngleBracketedParameters(ref data) => {
317 data.lifetimes.iter().collect()
319 ParenthesizedParameters(_) => {
325 pub fn bindings(&self) -> Vec<&P<TypeBinding>> {
327 AngleBracketedParameters(ref data) => {
328 data.bindings.iter().collect()
330 ParenthesizedParameters(_) => {
337 /// A path like `Foo<'a, T>`
338 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
339 pub struct AngleBracketedParameterData {
340 /// The lifetime parameters for this path segment.
341 pub lifetimes: Vec<Lifetime>,
342 /// The type parameters for this path segment, if present.
343 pub types: OwnedSlice<P<Ty>>,
344 /// Bindings (equality constraints) on associated types, if present.
345 /// E.g., `Foo<A=Bar>`.
346 pub bindings: OwnedSlice<P<TypeBinding>>,
349 impl AngleBracketedParameterData {
350 fn is_empty(&self) -> bool {
351 self.lifetimes.is_empty() && self.types.is_empty() && self.bindings.is_empty()
355 /// A path like `Foo(A,B) -> C`
356 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
357 pub struct ParenthesizedParameterData {
362 pub inputs: Vec<P<Ty>>,
365 pub output: Option<P<Ty>>,
368 pub type CrateNum = u32;
370 pub type NodeId = u32;
372 /// Node id used to represent the root of the crate.
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 = !0;
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, Debug)]
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, Debug)]
393 pub enum TraitBoundModifier {
398 pub type TyParamBounds = OwnedSlice<TyParamBound>;
400 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
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, Debug)]
412 pub struct Generics {
413 pub lifetimes: Vec<LifetimeDef>,
414 pub ty_params: OwnedSlice<TyParam>,
415 pub where_clause: WhereClause,
419 pub fn is_lt_parameterized(&self) -> bool {
420 !self.lifetimes.is_empty()
422 pub fn is_type_parameterized(&self) -> bool {
423 !self.ty_params.is_empty()
425 pub fn is_parameterized(&self) -> bool {
426 self.is_lt_parameterized() || self.is_type_parameterized()
430 /// A `where` clause in a definition
431 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
432 pub struct WhereClause {
434 pub predicates: Vec<WherePredicate>,
437 /// A single predicate in a `where` clause
438 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
439 pub enum WherePredicate {
440 /// A type binding, eg `for<'c> Foo: Send+Clone+'c`
441 BoundPredicate(WhereBoundPredicate),
442 /// A lifetime predicate, e.g. `'a: 'b+'c`
443 RegionPredicate(WhereRegionPredicate),
444 /// An equality predicate (unsupported)
445 EqPredicate(WhereEqPredicate),
448 /// A type bound, eg `for<'c> Foo: Send+Clone+'c`
449 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
450 pub struct WhereBoundPredicate {
452 /// Any lifetimes from a `for` binding
453 pub bound_lifetimes: Vec<LifetimeDef>,
454 /// The type being bounded
455 pub bounded_ty: P<Ty>,
456 /// Trait and lifetime bounds (`Clone+Send+'static`)
457 pub bounds: OwnedSlice<TyParamBound>,
460 /// A lifetime predicate, e.g. `'a: 'b+'c`
461 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
462 pub struct WhereRegionPredicate {
464 pub lifetime: Lifetime,
465 pub bounds: Vec<Lifetime>,
468 /// An equality predicate (unsupported), e.g. `T=int`
469 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
470 pub struct WhereEqPredicate {
477 /// The set of MetaItems that define the compilation environment of the crate,
478 /// used to drive conditional compilation
479 pub type CrateConfig = Vec<P<MetaItem>> ;
481 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
484 pub attrs: Vec<Attribute>,
485 pub config: CrateConfig,
487 pub exported_macros: Vec<MacroDef>,
490 pub type MetaItem = Spanned<MetaItem_>;
492 #[derive(Clone, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
494 MetaWord(InternedString),
495 MetaList(InternedString, Vec<P<MetaItem>>),
496 MetaNameValue(InternedString, Lit),
499 // can't be derived because the MetaList requires an unordered comparison
500 impl PartialEq for MetaItem_ {
501 fn eq(&self, other: &MetaItem_) -> bool {
503 MetaWord(ref ns) => match *other {
504 MetaWord(ref no) => (*ns) == (*no),
507 MetaNameValue(ref ns, ref vs) => match *other {
508 MetaNameValue(ref no, ref vo) => {
509 (*ns) == (*no) && vs.node == vo.node
513 MetaList(ref ns, ref miss) => match *other {
514 MetaList(ref no, ref miso) => {
516 miss.iter().all(|mi| miso.iter().any(|x| x.node == mi.node))
524 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
526 /// Statements in a block
527 pub stmts: Vec<P<Stmt>>,
528 /// An expression at the end of the block
529 /// without a semicolon, if any
530 pub expr: Option<P<Expr>>,
532 /// Distinguishes between `unsafe { ... }` and `{ ... }`
533 pub rules: BlockCheckMode,
537 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash)]
544 impl fmt::Debug for Pat {
545 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
546 write!(f, "pat({}: {})", self.id, pprust::pat_to_string(self))
550 /// A single field in a struct pattern
552 /// Patterns like the fields of Foo `{ x, ref y, ref mut z }`
553 /// are treated the same as` x: x, y: ref y, z: ref mut z`,
554 /// except is_shorthand is true
555 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
556 pub struct FieldPat {
557 /// The identifier for the field
559 /// The pattern the field is destructured to
561 pub is_shorthand: bool,
564 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
565 pub enum BindingMode {
566 BindByRef(Mutability),
567 BindByValue(Mutability),
570 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
571 pub enum PatWildKind {
572 /// Represents the wildcard pattern `_`
575 /// Represents the wildcard pattern `..`
579 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
581 /// Represents a wildcard pattern (either `_` or `..`)
582 PatWild(PatWildKind),
584 /// A PatIdent may either be a new bound variable,
585 /// or a nullary enum (in which case the third field
588 /// In the nullary enum case, the parser can't determine
589 /// which it is. The resolver determines this, and
590 /// records this pattern's NodeId in an auxiliary
591 /// set (of "PatIdents that refer to nullary enums")
592 PatIdent(BindingMode, SpannedIdent, Option<P<Pat>>),
594 /// "None" means a * pattern where we don't bind the fields to names.
595 PatEnum(Path, Option<Vec<P<Pat>>>),
597 /// An associated const named using the qualified path `<T>::CONST` or
598 /// `<T as Trait>::CONST`. Associated consts from inherent impls can be
599 /// referred to as simply `T::CONST`, in which case they will end up as
600 /// PatEnum, and the resolver will have to sort that out.
601 PatQPath(QSelf, Path),
603 /// Destructuring of a struct, e.g. `Foo {x, y, ..}`
604 /// The `bool` is `true` in the presence of a `..`
605 PatStruct(Path, Vec<Spanned<FieldPat>>, bool),
606 /// A tuple pattern `(a, b)`
610 /// A reference pattern, e.g. `&mut (a, b)`
611 PatRegion(P<Pat>, Mutability),
614 /// A range pattern, e.g. `1...2`
615 PatRange(P<Expr>, P<Expr>),
616 /// [a, b, ..i, y, z] is represented as:
617 /// PatVec(box [a, b], Some(i), box [y, z])
618 PatVec(Vec<P<Pat>>, Option<P<Pat>>, Vec<P<Pat>>),
619 /// A macro pattern; pre-expansion
623 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
624 pub enum Mutability {
629 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
631 /// The `+` operator (addition)
633 /// The `-` operator (subtraction)
635 /// The `*` operator (multiplication)
637 /// The `/` operator (division)
639 /// The `%` operator (modulus)
641 /// The `&&` operator (logical and)
643 /// The `||` operator (logical or)
645 /// The `^` operator (bitwise xor)
647 /// The `&` operator (bitwise and)
649 /// The `|` operator (bitwise or)
651 /// The `<<` operator (shift left)
653 /// The `>>` operator (shift right)
655 /// The `==` operator (equality)
657 /// The `<` operator (less than)
659 /// The `<=` operator (less than or equal to)
661 /// The `!=` operator (not equal to)
663 /// The `>=` operator (greater than or equal to)
665 /// The `>` operator (greater than)
669 pub type BinOp = Spanned<BinOp_>;
671 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
673 /// The `box` operator
675 /// The `*` operator for dereferencing
677 /// The `!` operator for logical inversion
679 /// The `-` operator for negation
684 pub type Stmt = Spanned<Stmt_>;
686 impl fmt::Debug for Stmt {
687 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
688 write!(f, "stmt({}: {})",
689 ast_util::stmt_id(self)
690 .map_or(Cow::Borrowed("<macro>"),|id|Cow::Owned(id.to_string())),
691 pprust::stmt_to_string(self))
696 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash)]
698 /// Could be an item or a local (let) binding:
699 StmtDecl(P<Decl>, NodeId),
701 /// Expr without trailing semi-colon (must have unit type):
702 StmtExpr(P<Expr>, NodeId),
704 /// Expr with trailing semi-colon (may have any type):
705 StmtSemi(P<Expr>, NodeId),
707 StmtMac(P<Mac>, MacStmtStyle),
709 #[derive(Clone, Copy, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
710 pub enum MacStmtStyle {
711 /// The macro statement had a trailing semicolon, e.g. `foo! { ... };`
712 /// `foo!(...);`, `foo![...];`
713 MacStmtWithSemicolon,
714 /// The macro statement had braces; e.g. foo! { ... }
716 /// The macro statement had parentheses or brackets and no semicolon; e.g.
717 /// `foo!(...)`. All of these will end up being converted into macro
719 MacStmtWithoutBraces,
722 // FIXME (pending discussion of #1697, #2178...): local should really be
723 // a refinement on pat.
724 /// Local represents a `let` statement, e.g., `let <pat>:<ty> = <expr>;`
725 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
728 pub ty: Option<P<Ty>>,
729 /// Initializer expression to set the value, if any
730 pub init: Option<P<Expr>>,
735 pub type Decl = Spanned<Decl_>;
737 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
739 /// A local (let) binding:
745 /// represents one arm of a 'match'
746 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
748 pub attrs: Vec<Attribute>,
749 pub pats: Vec<P<Pat>>,
750 pub guard: Option<P<Expr>>,
754 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
756 pub ident: SpannedIdent,
761 pub type SpannedIdent = Spanned<Ident>;
763 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
764 pub enum BlockCheckMode {
766 UnsafeBlock(UnsafeSource),
767 PushUnsafeBlock(UnsafeSource),
768 PopUnsafeBlock(UnsafeSource),
771 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
772 pub enum UnsafeSource {
778 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash,)]
785 impl fmt::Debug for Expr {
786 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
787 write!(f, "expr({}: {})", self.id, pprust::expr_to_string(self))
791 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
793 /// First expr is the place; second expr is the value.
794 ExprBox(Option<P<Expr>>, P<Expr>),
795 /// An array (`[a, b, c, d]`)
796 ExprVec(Vec<P<Expr>>),
799 /// The first field resolves to the function itself,
800 /// and the second field is the list of arguments
801 ExprCall(P<Expr>, Vec<P<Expr>>),
802 /// A method call (`x.foo::<Bar, Baz>(a, b, c, d)`)
804 /// The `SpannedIdent` is the identifier for the method name.
805 /// The vector of `Ty`s are the ascripted type parameters for the method
806 /// (within the angle brackets).
808 /// The first element of the vector of `Expr`s is the expression that evaluates
809 /// to the object on which the method is being called on (the receiver),
810 /// and the remaining elements are the rest of the arguments.
812 /// Thus, `x.foo::<Bar, Baz>(a, b, c, d)` is represented as
813 /// `ExprMethodCall(foo, [Bar, Baz], [x, a, b, c, d])`.
814 ExprMethodCall(SpannedIdent, Vec<P<Ty>>, Vec<P<Expr>>),
815 /// A tuple (`(a, b, c ,d)`)
816 ExprTup(Vec<P<Expr>>),
817 /// A binary operation (For example: `a + b`, `a * b`)
818 ExprBinary(BinOp, P<Expr>, P<Expr>),
819 /// A unary operation (For example: `!x`, `*x`)
820 ExprUnary(UnOp, P<Expr>),
821 /// A literal (For example: `1u8`, `"foo"`)
823 /// A cast (`foo as f64`)
824 ExprCast(P<Expr>, P<Ty>),
825 /// An `if` block, with an optional else block
827 /// `if expr { block } else { expr }`
828 ExprIf(P<Expr>, P<Block>, Option<P<Expr>>),
829 /// An `if let` expression with an optional else block
831 /// `if let pat = expr { block } else { expr }`
833 /// This is desugared to a `match` expression.
834 ExprIfLet(P<Pat>, P<Expr>, P<Block>, Option<P<Expr>>),
835 // FIXME #6993: change to Option<Name> ... or not, if these are hygienic.
836 /// A while loop, with an optional label
838 /// `'label: while expr { block }`
839 ExprWhile(P<Expr>, P<Block>, Option<Ident>),
840 // FIXME #6993: change to Option<Name> ... or not, if these are hygienic.
841 /// A while-let loop, with an optional label
843 /// `'label: while let pat = expr { block }`
845 /// This is desugared to a combination of `loop` and `match` expressions.
846 ExprWhileLet(P<Pat>, P<Expr>, P<Block>, Option<Ident>),
847 // FIXME #6993: change to Option<Name> ... or not, if these are hygienic.
848 /// A for loop, with an optional label
850 /// `'label: for pat in expr { block }`
852 /// This is desugared to a combination of `loop` and `match` expressions.
853 ExprForLoop(P<Pat>, P<Expr>, P<Block>, Option<Ident>),
854 /// Conditionless loop (can be exited with break, continue, or return)
856 /// `'label: loop { block }`
857 // FIXME #6993: change to Option<Name> ... or not, if these are hygienic.
858 ExprLoop(P<Block>, Option<Ident>),
859 /// A `match` block, with a source that indicates whether or not it is
860 /// the result of a desugaring, and if so, which kind.
861 ExprMatch(P<Expr>, Vec<Arm>, MatchSource),
862 /// A closure (for example, `move |a, b, c| {a + b + c}`)
863 ExprClosure(CaptureClause, P<FnDecl>, P<Block>),
864 /// A block (`{ ... }`)
867 /// An assignment (`a = foo()`)
868 ExprAssign(P<Expr>, P<Expr>),
869 /// An assignment with an operator
871 /// For example, `a += 1`.
872 ExprAssignOp(BinOp, P<Expr>, P<Expr>),
873 /// Access of a named struct field (`obj.foo`)
874 ExprField(P<Expr>, SpannedIdent),
875 /// Access of an unnamed field of a struct or tuple-struct
877 /// For example, `foo.0`.
878 ExprTupField(P<Expr>, Spanned<usize>),
879 /// An indexing operation (`foo[2]`)
880 ExprIndex(P<Expr>, P<Expr>),
881 /// A range (`1..2`, `1..`, or `..2`)
882 ExprRange(Option<P<Expr>>, Option<P<Expr>>),
884 /// Variable reference, possibly containing `::` and/or type
885 /// parameters, e.g. foo::bar::<baz>.
887 /// Optionally "qualified",
888 /// e.g. `<Vec<T> as SomeTrait>::SomeType`.
889 ExprPath(Option<QSelf>, Path),
891 /// A referencing operation (`&a` or `&mut a`)
892 ExprAddrOf(Mutability, P<Expr>),
893 /// A `break`, with an optional label to break
894 ExprBreak(Option<SpannedIdent>),
895 /// A `continue`, with an optional label
896 ExprAgain(Option<SpannedIdent>),
897 /// A `return`, with an optional value to be returned
898 ExprRet(Option<P<Expr>>),
900 /// Output of the `asm!()` macro
901 ExprInlineAsm(InlineAsm),
903 /// A macro invocation; pre-expansion
906 /// A struct literal expression.
908 /// For example, `Foo {x: 1, y: 2}`, or
909 /// `Foo {x: 1, .. base}`, where `base` is the `Option<Expr>`.
910 ExprStruct(Path, Vec<Field>, Option<P<Expr>>),
912 /// An array literal constructed from one repeated element.
914 /// For example, `[1u8; 5]`. The first expression is the element
915 /// to be repeated; the second is the number of times to repeat it.
916 ExprRepeat(P<Expr>, P<Expr>),
918 /// No-op: used solely so we can pretty-print faithfully
922 /// The explicit Self type in a "qualified path". The actual
923 /// path, including the trait and the associated item, is stored
924 /// separately. `position` represents the index of the associated
925 /// item qualified with this Self type.
927 /// <Vec<T> as a::b::Trait>::AssociatedItem
928 /// ^~~~~ ~~~~~~~~~~~~~~^
931 /// <Vec<T>>::AssociatedItem
934 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
940 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
941 pub enum MatchSource {
943 IfLetDesugar { contains_else_clause: bool },
948 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
949 pub enum CaptureClause {
954 /// A delimited sequence of token trees
955 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
956 pub struct Delimited {
957 /// The type of delimiter
958 pub delim: token::DelimToken,
959 /// The span covering the opening delimiter
961 /// The delimited sequence of token trees
962 pub tts: Vec<TokenTree>,
963 /// The span covering the closing delimiter
964 pub close_span: Span,
968 /// Returns the opening delimiter as a token.
969 pub fn open_token(&self) -> token::Token {
970 token::OpenDelim(self.delim)
973 /// Returns the closing delimiter as a token.
974 pub fn close_token(&self) -> token::Token {
975 token::CloseDelim(self.delim)
978 /// Returns the opening delimiter as a token tree.
979 pub fn open_tt(&self) -> TokenTree {
980 TtToken(self.open_span, self.open_token())
983 /// Returns the closing delimiter as a token tree.
984 pub fn close_tt(&self) -> TokenTree {
985 TtToken(self.close_span, self.close_token())
989 /// A sequence of token treesee
990 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
991 pub struct SequenceRepetition {
992 /// The sequence of token trees
993 pub tts: Vec<TokenTree>,
994 /// The optional separator
995 pub separator: Option<token::Token>,
996 /// Whether the sequence can be repeated zero (*), or one or more times (+)
998 /// The number of `MatchNt`s that appear in the sequence (and subsequences)
999 pub num_captures: usize,
1002 /// A Kleene-style [repetition operator](http://en.wikipedia.org/wiki/Kleene_star)
1003 /// for token sequences.
1004 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
1010 /// When the main rust parser encounters a syntax-extension invocation, it
1011 /// parses the arguments to the invocation as a token-tree. This is a very
1012 /// loose structure, such that all sorts of different AST-fragments can
1013 /// be passed to syntax extensions using a uniform type.
1015 /// If the syntax extension is an MBE macro, it will attempt to match its
1016 /// LHS token tree against the provided token tree, and if it finds a
1017 /// match, will transcribe the RHS token tree, splicing in any captured
1018 /// macro_parser::matched_nonterminals into the `SubstNt`s it finds.
1020 /// The RHS of an MBE macro is the only place `SubstNt`s are substituted.
1021 /// Nothing special happens to misnamed or misplaced `SubstNt`s.
1022 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1023 pub enum TokenTree {
1025 TtToken(Span, token::Token),
1026 /// A delimited sequence of token trees
1027 TtDelimited(Span, Rc<Delimited>),
1029 // This only makes sense in MBE macros.
1031 /// A kleene-style repetition sequence with a span
1032 // FIXME(eddyb) #12938 Use DST.
1033 TtSequence(Span, Rc<SequenceRepetition>),
1037 pub fn len(&self) -> usize {
1039 TtToken(_, token::DocComment(name)) => {
1040 match doc_comment_style(&name.as_str()) {
1045 TtToken(_, token::SpecialVarNt(..)) => 2,
1046 TtToken(_, token::MatchNt(..)) => 3,
1047 TtDelimited(_, ref delimed) => {
1048 delimed.tts.len() + 2
1050 TtSequence(_, ref seq) => {
1057 pub fn get_tt(&self, index: usize) -> TokenTree {
1058 match (self, index) {
1059 (&TtToken(sp, token::DocComment(_)), 0) => {
1060 TtToken(sp, token::Pound)
1062 (&TtToken(sp, token::DocComment(name)), 1)
1063 if doc_comment_style(&name.as_str()) == AttrInner => {
1064 TtToken(sp, token::Not)
1066 (&TtToken(sp, token::DocComment(name)), _) => {
1067 let stripped = strip_doc_comment_decoration(&name.as_str());
1068 TtDelimited(sp, Rc::new(Delimited {
1069 delim: token::Bracket,
1071 tts: vec![TtToken(sp, token::Ident(token::str_to_ident("doc"),
1073 TtToken(sp, token::Eq),
1074 TtToken(sp, token::Literal(
1075 token::StrRaw(token::intern(&stripped), 0), None))],
1079 (&TtDelimited(_, ref delimed), _) => {
1081 return delimed.open_tt();
1083 if index == delimed.tts.len() + 1 {
1084 return delimed.close_tt();
1086 delimed.tts[index - 1].clone()
1088 (&TtToken(sp, token::SpecialVarNt(var)), _) => {
1089 let v = [TtToken(sp, token::Dollar),
1090 TtToken(sp, token::Ident(token::str_to_ident(var.as_str()),
1094 (&TtToken(sp, token::MatchNt(name, kind, name_st, kind_st)), _) => {
1095 let v = [TtToken(sp, token::SubstNt(name, name_st)),
1096 TtToken(sp, token::Colon),
1097 TtToken(sp, token::Ident(kind, kind_st))];
1100 (&TtSequence(_, ref seq), _) => {
1101 seq.tts[index].clone()
1103 _ => panic!("Cannot expand a token tree")
1107 /// Returns the `Span` corresponding to this token tree.
1108 pub fn get_span(&self) -> Span {
1110 TtToken(span, _) => span,
1111 TtDelimited(span, _) => span,
1112 TtSequence(span, _) => span,
1116 /// Use this token tree as a matcher to parse given tts.
1117 pub fn parse(cx: &base::ExtCtxt, mtch: &[TokenTree], tts: &[TokenTree])
1118 -> macro_parser::NamedParseResult {
1119 // `None` is because we're not interpolating
1120 let arg_rdr = lexer::new_tt_reader_with_doc_flag(&cx.parse_sess().span_diagnostic,
1123 tts.iter().cloned().collect(),
1125 macro_parser::parse(cx.parse_sess(), cx.cfg(), arg_rdr, mtch)
1129 pub type Mac = Spanned<Mac_>;
1131 /// Represents a macro invocation. The Path indicates which macro
1132 /// is being invoked, and the vector of token-trees contains the source
1133 /// of the macro invocation.
1135 /// NB: the additional ident for a macro_rules-style macro is actually
1136 /// stored in the enclosing item. Oog.
1137 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1140 pub tts: Vec<TokenTree>,
1141 pub ctxt: SyntaxContext,
1144 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
1146 /// A regular string, like `"foo"`
1148 /// A raw string, like `r##"foo"##`
1150 /// The uint is the number of `#` symbols used
1155 pub type Lit = Spanned<Lit_>;
1157 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
1164 pub fn new<T: IntSign>(n: T) -> Sign {
1170 fn sign(&self) -> Sign;
1173 ($($t:ident)*) => ($(impl IntSign for $t {
1174 #[allow(unused_comparisons)]
1175 fn sign(&self) -> Sign {
1176 if *self < 0 {Minus} else {Plus}
1180 doit! { i8 i16 i32 i64 isize u8 u16 u32 u64 usize }
1182 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
1183 pub enum LitIntType {
1184 SignedIntLit(IntTy, Sign),
1185 UnsignedIntLit(UintTy),
1186 UnsuffixedIntLit(Sign)
1189 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1191 /// A string literal (`"foo"`)
1192 LitStr(InternedString, StrStyle),
1193 /// A byte string (`b"foo"`)
1194 LitByteStr(Rc<Vec<u8>>),
1195 /// A byte char (`b'f'`)
1197 /// A character literal (`'a'`)
1199 /// An integer literal (`1u8`)
1200 LitInt(u64, LitIntType),
1201 /// A float literal (`1f64` or `1E10f64`)
1202 LitFloat(InternedString, FloatTy),
1203 /// A float literal without a suffix (`1.0 or 1.0E10`)
1204 LitFloatUnsuffixed(InternedString),
1205 /// A boolean literal
1209 // NB: If you change this, you'll probably want to change the corresponding
1210 // type structure in middle/ty.rs as well.
1211 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1214 pub mutbl: Mutability,
1217 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1218 pub struct TypeField {
1224 /// Represents a method's signature in a trait declaration,
1225 /// or in an implementation.
1226 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1227 pub struct MethodSig {
1228 pub unsafety: Unsafety,
1229 pub constness: Constness,
1231 pub decl: P<FnDecl>,
1232 pub generics: Generics,
1233 pub explicit_self: ExplicitSelf,
1236 /// Represents a method declaration in a trait declaration, possibly including
1237 /// a default implementation A trait method is either required (meaning it
1238 /// doesn't have an implementation, just a signature) or provided (meaning it
1239 /// has a default implementation).
1240 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1241 pub struct TraitItem {
1244 pub attrs: Vec<Attribute>,
1245 pub node: TraitItem_,
1249 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1250 pub enum TraitItem_ {
1251 ConstTraitItem(P<Ty>, Option<P<Expr>>),
1252 MethodTraitItem(MethodSig, Option<P<Block>>),
1253 TypeTraitItem(TyParamBounds, Option<P<Ty>>),
1256 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1257 pub struct ImplItem {
1260 pub vis: Visibility,
1261 pub attrs: Vec<Attribute>,
1262 pub node: ImplItem_,
1266 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1267 pub enum ImplItem_ {
1268 ConstImplItem(P<Ty>, P<Expr>),
1269 MethodImplItem(MethodSig, P<Block>),
1270 TypeImplItem(P<Ty>),
1274 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Copy)]
1283 impl fmt::Debug for IntTy {
1284 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1285 fmt::Display::fmt(self, f)
1289 impl fmt::Display for IntTy {
1290 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1291 write!(f, "{}", ast_util::int_ty_to_string(*self, None))
1296 pub fn bit_width(&self) -> Option<usize> {
1298 TyIs => return None,
1307 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Copy)]
1317 pub fn bit_width(&self) -> Option<usize> {
1319 TyUs => return None,
1328 impl fmt::Debug for UintTy {
1329 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1330 fmt::Display::fmt(self, f)
1334 impl fmt::Display for UintTy {
1335 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1336 write!(f, "{}", ast_util::uint_ty_to_string(*self, None))
1340 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Copy)]
1346 impl fmt::Debug for FloatTy {
1347 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1348 fmt::Display::fmt(self, f)
1352 impl fmt::Display for FloatTy {
1353 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1354 write!(f, "{}", ast_util::float_ty_to_string(*self))
1359 pub fn bit_width(&self) -> usize {
1367 // Bind a type to an associated type: `A=Foo`.
1368 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1369 pub struct TypeBinding {
1376 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash)]
1383 impl fmt::Debug for Ty {
1384 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1385 write!(f, "type({})", pprust::ty_to_string(self))
1389 /// Not represented directly in the AST, referred to by name through a ty_path.
1390 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
1400 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1401 pub struct BareFnTy {
1402 pub unsafety: Unsafety,
1404 pub lifetimes: Vec<LifetimeDef>,
1408 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1409 /// The different kinds of types recognized by the compiler
1412 /// A fixed length array (`[T; n]`)
1413 TyFixedLengthVec(P<Ty>, P<Expr>),
1414 /// A raw pointer (`*const T` or `*mut T`)
1416 /// A reference (`&'a T` or `&'a mut T`)
1417 TyRptr(Option<Lifetime>, MutTy),
1418 /// A bare function (e.g. `fn(usize) -> bool`)
1419 TyBareFn(P<BareFnTy>),
1420 /// A tuple (`(A, B, C, D,...)`)
1422 /// A path (`module::module::...::Type`), optionally
1423 /// "qualified", e.g. `<Vec<T> as SomeTrait>::SomeType`.
1425 /// Type parameters are stored in the Path itself
1426 TyPath(Option<QSelf>, Path),
1427 /// Something like `A+B`. Note that `B` must always be a path.
1428 TyObjectSum(P<Ty>, TyParamBounds),
1429 /// A type like `for<'a> Foo<&'a Bar>`
1430 TyPolyTraitRef(TyParamBounds),
1431 /// No-op; kept solely so that we can pretty-print faithfully
1435 /// TyInfer means the type should be inferred instead of it having been
1436 /// specified. This can appear anywhere in a type.
1438 // A macro in the type position.
1442 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
1443 pub enum AsmDialect {
1448 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1449 pub struct InlineAsm {
1450 pub asm: InternedString,
1451 pub asm_str_style: StrStyle,
1452 pub outputs: Vec<(InternedString, P<Expr>, bool)>,
1453 pub inputs: Vec<(InternedString, P<Expr>)>,
1454 pub clobbers: Vec<InternedString>,
1456 pub alignstack: bool,
1457 pub dialect: AsmDialect,
1458 pub expn_id: ExpnId,
1461 /// represents an argument in a function header
1462 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1470 pub fn new_self(span: Span, mutability: Mutability, self_ident: Ident) -> Arg {
1471 let path = Spanned{span:span,node:self_ident};
1473 // HACK(eddyb) fake type for the self argument.
1481 node: PatIdent(BindByValue(mutability), path, None),
1489 /// Represents the header (not the body) of a function declaration
1490 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1492 pub inputs: Vec<Arg>,
1493 pub output: FunctionRetTy,
1497 #[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1503 #[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1504 pub enum Constness {
1509 impl fmt::Display for Unsafety {
1510 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1511 fmt::Display::fmt(match *self {
1512 Unsafety::Normal => "normal",
1513 Unsafety::Unsafe => "unsafe",
1518 #[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash)]
1519 pub enum ImplPolarity {
1520 /// `impl Trait for Type`
1522 /// `impl !Trait for Type`
1526 impl fmt::Debug for ImplPolarity {
1527 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1529 ImplPolarity::Positive => "positive".fmt(f),
1530 ImplPolarity::Negative => "negative".fmt(f),
1536 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1537 pub enum FunctionRetTy {
1538 /// Functions with return type `!`that always
1539 /// raise an error or exit (i.e. never return to the caller)
1541 /// Return type is not specified.
1543 /// Functions default to `()` and
1544 /// closures default to inference. Span points to where return
1545 /// type would be inserted.
1546 DefaultReturn(Span),
1551 impl FunctionRetTy {
1552 pub fn span(&self) -> Span {
1554 NoReturn(span) => span,
1555 DefaultReturn(span) => span,
1556 Return(ref ty) => ty.span
1561 /// Represents the kind of 'self' associated with a method
1562 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1563 pub enum ExplicitSelf_ {
1568 /// `&'lt self`, `&'lt mut self`
1569 SelfRegion(Option<Lifetime>, Mutability, Ident),
1571 SelfExplicit(P<Ty>, Ident),
1574 pub type ExplicitSelf = Spanned<ExplicitSelf_>;
1576 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1578 /// A span from the first token past `{` to the last token until `}`.
1579 /// For `mod foo;`, the inner span ranges from the first token
1580 /// to the last token in the external file.
1582 pub items: Vec<P<Item>>,
1585 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1586 pub struct ForeignMod {
1588 pub items: Vec<P<ForeignItem>>,
1591 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1592 pub struct VariantArg {
1597 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1598 pub enum VariantKind {
1599 /// Tuple variant, e.g. `Foo(A, B)`
1600 TupleVariantKind(Vec<VariantArg>),
1601 /// Struct variant, e.g. `Foo {x: A, y: B}`
1602 StructVariantKind(P<StructDef>),
1605 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1606 pub struct EnumDef {
1607 pub variants: Vec<P<Variant>>,
1610 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1611 pub struct Variant_ {
1613 pub attrs: Vec<Attribute>,
1614 pub kind: VariantKind,
1616 /// Explicit discriminant, eg `Foo = 1`
1617 pub disr_expr: Option<P<Expr>>,
1620 pub type Variant = Spanned<Variant_>;
1622 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
1623 pub enum PathListItem_ {
1626 /// renamed in list, eg `use foo::{bar as baz};`
1627 rename: Option<Ident>,
1631 /// renamed in list, eg `use foo::{self as baz};`
1632 rename: Option<Ident>,
1637 impl PathListItem_ {
1638 pub fn id(&self) -> NodeId {
1640 PathListIdent { id, .. } | PathListMod { id, .. } => id
1644 pub fn rename(&self) -> Option<Ident> {
1646 PathListIdent { rename, .. } | PathListMod { rename, .. } => rename
1651 pub type PathListItem = Spanned<PathListItem_>;
1653 pub type ViewPath = Spanned<ViewPath_>;
1655 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1656 pub enum ViewPath_ {
1658 /// `foo::bar::baz as quux`
1662 /// `foo::bar::baz` (with `as baz` implicitly on the right)
1663 ViewPathSimple(Ident, Path),
1668 /// `foo::bar::{a,b,c}`
1669 ViewPathList(Path, Vec<PathListItem>)
1672 /// Meta-data associated with an item
1673 pub type Attribute = Spanned<Attribute_>;
1675 /// Distinguishes between Attributes that decorate items and Attributes that
1676 /// are contained as statements within items. These two cases need to be
1677 /// distinguished for pretty-printing.
1678 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
1679 pub enum AttrStyle {
1684 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
1685 pub struct AttrId(pub usize);
1687 /// Doc-comments are promoted to attributes that have is_sugared_doc = true
1688 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1689 pub struct Attribute_ {
1691 pub style: AttrStyle,
1692 pub value: P<MetaItem>,
1693 pub is_sugared_doc: bool,
1696 /// TraitRef's appear in impls.
1698 /// resolve maps each TraitRef's ref_id to its defining trait; that's all
1699 /// that the ref_id is for. The impl_id maps to the "self type" of this impl.
1700 /// If this impl is an ItemImpl, the impl_id is redundant (it could be the
1701 /// same as the impl's node id).
1702 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1703 pub struct TraitRef {
1708 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1709 pub struct PolyTraitRef {
1710 /// The `'a` in `<'a> Foo<&'a T>`
1711 pub bound_lifetimes: Vec<LifetimeDef>,
1713 /// The `Foo<&'a T>` in `<'a> Foo<&'a T>`
1714 pub trait_ref: TraitRef,
1719 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
1720 pub enum Visibility {
1726 pub fn inherit_from(&self, parent_visibility: Visibility) -> Visibility {
1728 &Inherited => parent_visibility,
1734 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1735 pub struct StructField_ {
1736 pub kind: StructFieldKind,
1739 pub attrs: Vec<Attribute>,
1743 pub fn ident(&self) -> Option<Ident> {
1745 NamedField(ref ident, _) => Some(ident.clone()),
1746 UnnamedField(_) => None
1751 pub type StructField = Spanned<StructField_>;
1753 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
1754 pub enum StructFieldKind {
1755 NamedField(Ident, Visibility),
1756 /// Element of a tuple-like struct
1757 UnnamedField(Visibility),
1760 impl StructFieldKind {
1761 pub fn is_unnamed(&self) -> bool {
1763 UnnamedField(..) => true,
1764 NamedField(..) => false,
1769 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1770 pub struct StructDef {
1771 /// Fields, not including ctor
1772 pub fields: Vec<StructField>,
1773 /// ID of the constructor. This is only used for tuple- or enum-like
1775 pub ctor_id: Option<NodeId>,
1779 FIXME (#3300): Should allow items to be anonymous. Right now
1780 we just use dummy names for anon items.
1784 /// The name might be a dummy name in case of anonymous items
1785 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1788 pub attrs: Vec<Attribute>,
1791 pub vis: Visibility,
1795 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1797 /// An`extern crate` item, with optional original crate name,
1799 /// e.g. `extern crate foo` or `extern crate foo_bar as foo`
1800 ItemExternCrate(Option<Name>),
1801 /// A `use` or `pub use` item
1802 ItemUse(P<ViewPath>),
1805 ItemStatic(P<Ty>, Mutability, P<Expr>),
1807 ItemConst(P<Ty>, P<Expr>),
1808 /// A function declaration
1809 ItemFn(P<FnDecl>, Unsafety, Constness, Abi, Generics, P<Block>),
1812 /// An external module
1813 ItemForeignMod(ForeignMod),
1814 /// A type alias, e.g. `type Foo = Bar<u8>`
1815 ItemTy(P<Ty>, Generics),
1816 /// An enum definition, e.g. `enum Foo<A, B> {C<A>, D<B>}`
1817 ItemEnum(EnumDef, Generics),
1818 /// A struct definition, e.g. `struct Foo<A> {x: A}`
1819 ItemStruct(P<StructDef>, Generics),
1820 /// Represents a Trait Declaration
1826 // Default trait implementations
1828 // `impl Trait for .. {}`
1829 ItemDefaultImpl(Unsafety, TraitRef),
1830 /// An implementation, eg `impl<A> Trait for Foo { .. }`
1834 Option<TraitRef>, // (optional) trait this impl implements
1837 /// A macro invocation (which includes macro definition)
1842 pub fn descriptive_variant(&self) -> &str {
1844 ItemExternCrate(..) => "extern crate",
1845 ItemUse(..) => "use",
1846 ItemStatic(..) => "static item",
1847 ItemConst(..) => "constant item",
1848 ItemFn(..) => "function",
1849 ItemMod(..) => "module",
1850 ItemForeignMod(..) => "foreign module",
1851 ItemTy(..) => "type alias",
1852 ItemEnum(..) => "enum",
1853 ItemStruct(..) => "struct",
1854 ItemTrait(..) => "trait",
1857 ItemDefaultImpl(..) => "item"
1862 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1863 pub struct ForeignItem {
1865 pub attrs: Vec<Attribute>,
1866 pub node: ForeignItem_,
1869 pub vis: Visibility,
1872 /// An item within an `extern` block
1873 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1874 pub enum ForeignItem_ {
1875 /// A foreign function
1876 ForeignItemFn(P<FnDecl>, Generics),
1877 /// A foreign static item (`static ext: u8`), with optional mutability
1878 /// (the boolean is true when mutable)
1879 ForeignItemStatic(P<Ty>, bool),
1883 pub fn descriptive_variant(&self) -> &str {
1885 ForeignItemFn(..) => "foreign function",
1886 ForeignItemStatic(..) => "foreign static item"
1891 /// A macro definition, in this crate or imported from another.
1893 /// Not parsed directly, but created on macro import or `macro_rules!` expansion.
1894 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1895 pub struct MacroDef {
1897 pub attrs: Vec<Attribute>,
1900 pub imported_from: Option<Ident>,
1902 pub use_locally: bool,
1903 pub allow_internal_unstable: bool,
1904 pub body: Vec<TokenTree>,
1912 // are ASTs encodable?
1914 fn check_asts_encodable() {
1915 fn assert_encodable<T: serialize::Encodable>() {}
1916 assert_encodable::<Crate>();