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::TyParamBound::*;
14 pub use self::UnsafeSource::*;
15 pub use self::ViewPath_::*;
16 pub use self::PathParameters::*;
17 pub use symbol::{Ident, Symbol as Name};
18 pub use util::ThinVec;
20 use syntax_pos::{Span, DUMMY_SP};
21 use codemap::{respan, Spanned};
23 use ext::hygiene::{Mark, SyntaxContext};
26 use rustc_data_structures::indexed_vec;
27 use symbol::{Symbol, keywords};
28 use tokenstream::{ThinTokenStream, TokenStream};
30 use serialize::{self, Encoder, Decoder};
31 use std::collections::HashSet;
36 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Copy)]
43 impl fmt::Debug for Lifetime {
44 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
45 write!(f, "lifetime({}: {})", self.id, pprust::lifetime_to_string(self))
49 /// A lifetime definition, e.g. `'a: 'b+'c+'d`
50 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
51 pub struct LifetimeDef {
52 pub attrs: ThinVec<Attribute>,
53 pub lifetime: Lifetime,
54 pub bounds: Vec<Lifetime>
57 /// A "Path" is essentially Rust's notion of a name.
59 /// It's represented as a sequence of identifiers,
60 /// along with a bunch of supporting information.
62 /// E.g. `std::cmp::PartialEq`
63 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash)]
66 /// The segments in the path: the things separated by `::`.
67 /// Global paths begin with `keywords::CrateRoot`.
68 pub segments: Vec<PathSegment>,
71 impl<'a> PartialEq<&'a str> for Path {
72 fn eq(&self, string: &&'a str) -> bool {
73 self.segments.len() == 1 && self.segments[0].identifier.name == *string
77 impl fmt::Debug for Path {
78 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
79 write!(f, "path({})", pprust::path_to_string(self))
83 impl fmt::Display for Path {
84 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
85 write!(f, "{}", pprust::path_to_string(self))
90 // convert a span and an identifier to the corresponding
92 pub fn from_ident(s: Span, identifier: Ident) -> Path {
95 segments: vec![PathSegment::from_ident(identifier, s)],
99 pub fn default_to_global(mut self) -> Path {
100 if !self.is_global() &&
101 !::parse::token::Ident(self.segments[0].identifier).is_path_segment_keyword() {
102 self.segments.insert(0, PathSegment::crate_root(self.span));
107 pub fn is_global(&self) -> bool {
108 !self.segments.is_empty() && self.segments[0].identifier.name == keywords::CrateRoot.name()
112 /// A segment of a path: an identifier, an optional lifetime, and a set of types.
114 /// E.g. `std`, `String` or `Box<T>`
115 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
116 pub struct PathSegment {
117 /// The identifier portion of this path segment.
118 pub identifier: Ident,
119 /// Span of the segment identifier.
122 /// Type/lifetime parameters attached to this path. They come in
123 /// two flavors: `Path<A,B,C>` and `Path(A,B) -> C`.
124 /// `None` means that no parameter list is supplied (`Path`),
125 /// `Some` means that parameter list is supplied (`Path<X, Y>`)
126 /// but it can be empty (`Path<>`).
127 /// `P` is used as a size optimization for the common case with no parameters.
128 pub parameters: Option<P<PathParameters>>,
132 pub fn from_ident(ident: Ident, span: Span) -> Self {
133 PathSegment { identifier: ident, span: span, parameters: None }
135 pub fn crate_root(span: Span) -> Self {
137 identifier: Ident { ctxt: span.ctxt(), ..keywords::CrateRoot.ident() },
144 /// Parameters of a path segment.
146 /// E.g. `<A, B>` as in `Foo<A, B>` or `(A, B)` as in `Foo(A, B)`
147 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
148 pub enum PathParameters {
149 /// The `<'a, A,B,C>` in `foo::bar::baz::<'a, A,B,C>`
150 AngleBracketed(AngleBracketedParameterData),
151 /// The `(A,B)` and `C` in `Foo(A,B) -> C`
152 Parenthesized(ParenthesizedParameterData),
155 impl PathParameters {
156 pub fn span(&self) -> Span {
158 AngleBracketed(ref data) => data.span,
159 Parenthesized(ref data) => data.span,
164 /// A path like `Foo<'a, T>`
165 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Default)]
166 pub struct AngleBracketedParameterData {
169 /// The lifetime parameters for this path segment.
170 pub lifetimes: Vec<Lifetime>,
171 /// The type parameters for this path segment, if present.
172 pub types: Vec<P<Ty>>,
173 /// Bindings (equality constraints) on associated types, if present.
175 /// E.g., `Foo<A=Bar>`.
176 pub bindings: Vec<TypeBinding>,
179 impl Into<Option<P<PathParameters>>> for AngleBracketedParameterData {
180 fn into(self) -> Option<P<PathParameters>> {
181 Some(P(PathParameters::AngleBracketed(self)))
185 impl Into<Option<P<PathParameters>>> for ParenthesizedParameterData {
186 fn into(self) -> Option<P<PathParameters>> {
187 Some(P(PathParameters::Parenthesized(self)))
191 /// A path like `Foo(A,B) -> C`
192 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
193 pub struct ParenthesizedParameterData {
198 pub inputs: Vec<P<Ty>>,
201 pub output: Option<P<Ty>>,
204 #[derive(Clone, Copy, PartialEq, PartialOrd, Eq, Ord, Hash, Debug)]
205 pub struct NodeId(u32);
208 pub fn new(x: usize) -> NodeId {
209 assert!(x < (u32::MAX as usize));
213 pub fn from_u32(x: u32) -> NodeId {
217 pub fn as_usize(&self) -> usize {
221 pub fn as_u32(&self) -> u32 {
225 pub fn placeholder_from_mark(mark: Mark) -> Self {
226 NodeId(mark.as_u32())
229 pub fn placeholder_to_mark(self) -> Mark {
230 Mark::from_u32(self.0)
234 impl fmt::Display for NodeId {
235 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
236 fmt::Display::fmt(&self.0, f)
240 impl serialize::UseSpecializedEncodable for NodeId {
241 fn default_encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
246 impl serialize::UseSpecializedDecodable for NodeId {
247 fn default_decode<D: Decoder>(d: &mut D) -> Result<NodeId, D::Error> {
248 d.read_u32().map(NodeId)
252 impl indexed_vec::Idx for NodeId {
253 fn new(idx: usize) -> Self {
257 fn index(self) -> usize {
262 /// Node id used to represent the root of the crate.
263 pub const CRATE_NODE_ID: NodeId = NodeId(0);
265 /// When parsing and doing expansions, we initially give all AST nodes this AST
266 /// node value. Then later, in the renumber pass, we renumber them to have
267 /// small, positive ids.
268 pub const DUMMY_NODE_ID: NodeId = NodeId(!0);
270 /// The AST represents all type param bounds as types.
271 /// typeck::collect::compute_bounds matches these against
272 /// the "special" built-in traits (see middle::lang_items) and
273 /// detects Copy, Send and Sync.
274 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
275 pub enum TyParamBound {
276 TraitTyParamBound(PolyTraitRef, TraitBoundModifier),
277 RegionTyParamBound(Lifetime)
280 /// A modifier on a bound, currently this is only used for `?Sized`, where the
281 /// modifier is `Maybe`. Negative bounds should also be handled here.
282 #[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
283 pub enum TraitBoundModifier {
288 pub type TyParamBounds = Vec<TyParamBound>;
290 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
292 pub attrs: ThinVec<Attribute>,
295 pub bounds: TyParamBounds,
296 pub default: Option<P<Ty>>,
300 /// Represents lifetimes and type parameters attached to a declaration
301 /// of a function, enum, trait, etc.
302 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
303 pub struct Generics {
304 pub lifetimes: Vec<LifetimeDef>,
305 pub ty_params: Vec<TyParam>,
306 pub where_clause: WhereClause,
311 pub fn is_lt_parameterized(&self) -> bool {
312 !self.lifetimes.is_empty()
314 pub fn is_type_parameterized(&self) -> bool {
315 !self.ty_params.is_empty()
317 pub fn is_parameterized(&self) -> bool {
318 self.is_lt_parameterized() || self.is_type_parameterized()
320 pub fn span_for_name(&self, name: &str) -> Option<Span> {
321 for t in &self.ty_params {
322 if t.ident.name == name {
330 impl Default for Generics {
331 /// Creates an instance of `Generics`.
332 fn default() -> Generics {
334 lifetimes: Vec::new(),
335 ty_params: Vec::new(),
336 where_clause: WhereClause {
338 predicates: Vec::new(),
346 /// A `where` clause in a definition
347 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
348 pub struct WhereClause {
350 pub predicates: Vec<WherePredicate>,
354 /// A single predicate in a `where` clause
355 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
356 pub enum WherePredicate {
357 /// A type binding, e.g. `for<'c> Foo: Send+Clone+'c`
358 BoundPredicate(WhereBoundPredicate),
359 /// A lifetime predicate, e.g. `'a: 'b+'c`
360 RegionPredicate(WhereRegionPredicate),
361 /// An equality predicate (unsupported)
362 EqPredicate(WhereEqPredicate),
367 /// E.g. `for<'c> Foo: Send+Clone+'c`
368 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
369 pub struct WhereBoundPredicate {
371 /// Any lifetimes from a `for` binding
372 pub bound_lifetimes: Vec<LifetimeDef>,
373 /// The type being bounded
374 pub bounded_ty: P<Ty>,
375 /// Trait and lifetime bounds (`Clone+Send+'static`)
376 pub bounds: TyParamBounds,
379 /// A lifetime predicate.
382 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
383 pub struct WhereRegionPredicate {
385 pub lifetime: Lifetime,
386 pub bounds: Vec<Lifetime>,
389 /// An equality predicate (unsupported).
392 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
393 pub struct WhereEqPredicate {
400 /// The set of MetaItems that define the compilation environment of the crate,
401 /// used to drive conditional compilation
402 pub type CrateConfig = HashSet<(Name, Option<Symbol>)>;
404 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
407 pub attrs: Vec<Attribute>,
411 /// A spanned compile-time attribute list item.
412 pub type NestedMetaItem = Spanned<NestedMetaItemKind>;
414 /// Possible values inside of compile-time attribute lists.
416 /// E.g. the '..' in `#[name(..)]`.
417 #[derive(Clone, Eq, RustcEncodable, RustcDecodable, Hash, Debug, PartialEq)]
418 pub enum NestedMetaItemKind {
419 /// A full MetaItem, for recursive meta items.
423 /// E.g. "foo", 64, true
427 /// A spanned compile-time attribute item.
429 /// E.g. `#[test]`, `#[derive(..)]` or `#[feature = "foo"]`
430 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
431 pub struct MetaItem {
433 pub node: MetaItemKind,
437 /// A compile-time attribute item.
439 /// E.g. `#[test]`, `#[derive(..)]` or `#[feature = "foo"]`
440 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
441 pub enum MetaItemKind {
444 /// E.g. `test` as in `#[test]`
448 /// E.g. `derive(..)` as in `#[derive(..)]`
449 List(Vec<NestedMetaItem>),
450 /// Name value meta item.
452 /// E.g. `feature = "foo"` as in `#[feature = "foo"]`
456 /// A Block (`{ .. }`).
458 /// E.g. `{ .. }` as in `fn foo() { .. }`
459 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
461 /// Statements in a block
462 pub stmts: Vec<Stmt>,
464 /// Distinguishes between `unsafe { ... }` and `{ ... }`
465 pub rules: BlockCheckMode,
469 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash)]
476 impl fmt::Debug for Pat {
477 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
478 write!(f, "pat({}: {})", self.id, pprust::pat_to_string(self))
483 pub fn walk<F>(&self, it: &mut F) -> bool
484 where F: FnMut(&Pat) -> bool
491 PatKind::Ident(_, _, Some(ref p)) => p.walk(it),
492 PatKind::Struct(_, ref fields, _) => {
493 fields.iter().all(|field| field.node.pat.walk(it))
495 PatKind::TupleStruct(_, ref s, _) | PatKind::Tuple(ref s, _) => {
496 s.iter().all(|p| p.walk(it))
498 PatKind::Box(ref s) | PatKind::Ref(ref s, _) => {
501 PatKind::Slice(ref before, ref slice, ref after) => {
502 before.iter().all(|p| p.walk(it)) &&
503 slice.iter().all(|p| p.walk(it)) &&
504 after.iter().all(|p| p.walk(it))
518 /// A single field in a struct pattern
520 /// Patterns like the fields of Foo `{ x, ref y, ref mut z }`
521 /// are treated the same as` x: x, y: ref y, z: ref mut z`,
522 /// except is_shorthand is true
523 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
524 pub struct FieldPat {
525 /// The identifier for the field
527 /// The pattern the field is destructured to
529 pub is_shorthand: bool,
530 pub attrs: ThinVec<Attribute>,
533 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
534 pub enum BindingMode {
539 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
545 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
547 /// Represents a wildcard pattern (`_`)
550 /// A `PatKind::Ident` may either be a new bound variable (`ref mut binding @ OPT_SUBPATTERN`),
551 /// or a unit struct/variant pattern, or a const pattern (in the last two cases the third
552 /// field must be `None`). Disambiguation cannot be done with parser alone, so it happens
553 /// during name resolution.
554 Ident(BindingMode, SpannedIdent, Option<P<Pat>>),
556 /// A struct or struct variant pattern, e.g. `Variant {x, y, ..}`.
557 /// The `bool` is `true` in the presence of a `..`.
558 Struct(Path, Vec<Spanned<FieldPat>>, bool),
560 /// A tuple struct/variant pattern `Variant(x, y, .., z)`.
561 /// If the `..` pattern fragment is present, then `Option<usize>` denotes its position.
562 /// 0 <= position <= subpats.len()
563 TupleStruct(Path, Vec<P<Pat>>, Option<usize>),
565 /// A possibly qualified path pattern.
566 /// Unqualified path patterns `A::B::C` can legally refer to variants, structs, constants
567 /// or associated constants. Qualified path patterns `<A>::B::C`/`<A as Trait>::B::C` can
568 /// only legally refer to associated constants.
569 Path(Option<QSelf>, Path),
571 /// A tuple pattern `(a, b)`.
572 /// If the `..` pattern fragment is present, then `Option<usize>` denotes its position.
573 /// 0 <= position <= subpats.len()
574 Tuple(Vec<P<Pat>>, Option<usize>),
577 /// A reference pattern, e.g. `&mut (a, b)`
578 Ref(P<Pat>, Mutability),
581 /// A range pattern, e.g. `1...2` or `1..2`
582 Range(P<Expr>, P<Expr>, RangeEnd),
583 /// `[a, b, ..i, y, z]` is represented as:
584 /// `PatKind::Slice(box [a, b], Some(i), box [y, z])`
585 Slice(Vec<P<Pat>>, Option<P<Pat>>, Vec<P<Pat>>),
586 /// A macro pattern; pre-expansion
590 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
591 pub enum Mutability {
596 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
598 /// The `+` operator (addition)
600 /// The `-` operator (subtraction)
602 /// The `*` operator (multiplication)
604 /// The `/` operator (division)
606 /// The `%` operator (modulus)
608 /// The `&&` operator (logical and)
610 /// The `||` operator (logical or)
612 /// The `^` operator (bitwise xor)
614 /// The `&` operator (bitwise and)
616 /// The `|` operator (bitwise or)
618 /// The `<<` operator (shift left)
620 /// The `>>` operator (shift right)
622 /// The `==` operator (equality)
624 /// The `<` operator (less than)
626 /// The `<=` operator (less than or equal to)
628 /// The `!=` operator (not equal to)
630 /// The `>=` operator (greater than or equal to)
632 /// The `>` operator (greater than)
637 pub fn to_string(&self) -> &'static str {
638 use self::BinOpKind::*;
660 pub fn lazy(&self) -> bool {
662 BinOpKind::And | BinOpKind::Or => true,
667 pub fn is_shift(&self) -> bool {
669 BinOpKind::Shl | BinOpKind::Shr => true,
673 pub fn is_comparison(&self) -> bool {
674 use self::BinOpKind::*;
676 Eq | Lt | Le | Ne | Gt | Ge =>
678 And | Or | Add | Sub | Mul | Div | Rem |
679 BitXor | BitAnd | BitOr | Shl | Shr =>
683 /// Returns `true` if the binary operator takes its arguments by value
684 pub fn is_by_value(&self) -> bool {
685 !self.is_comparison()
689 pub type BinOp = Spanned<BinOpKind>;
691 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
693 /// The `*` operator for dereferencing
695 /// The `!` operator for logical inversion
697 /// The `-` operator for negation
702 /// Returns `true` if the unary operator takes its argument by value
703 pub fn is_by_value(u: UnOp) -> bool {
705 UnOp::Neg | UnOp::Not => true,
710 pub fn to_string(op: UnOp) -> &'static str {
720 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash)]
728 pub fn add_trailing_semicolon(mut self) -> Self {
729 self.node = match self.node {
730 StmtKind::Expr(expr) => StmtKind::Semi(expr),
731 StmtKind::Mac(mac) => StmtKind::Mac(mac.map(|(mac, _style, attrs)| {
732 (mac, MacStmtStyle::Semicolon, attrs)
739 pub fn is_item(&self) -> bool {
741 StmtKind::Local(_) => true,
747 impl fmt::Debug for Stmt {
748 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
749 write!(f, "stmt({}: {})", self.id.to_string(), pprust::stmt_to_string(self))
754 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash)]
756 /// A local (let) binding.
759 /// An item definition.
762 /// Expr without trailing semi-colon.
767 Mac(P<(Mac, MacStmtStyle, ThinVec<Attribute>)>),
770 #[derive(Clone, Copy, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
771 pub enum MacStmtStyle {
772 /// The macro statement had a trailing semicolon, e.g. `foo! { ... };`
773 /// `foo!(...);`, `foo![...];`
775 /// The macro statement had braces; e.g. foo! { ... }
777 /// The macro statement had parentheses or brackets and no semicolon; e.g.
778 /// `foo!(...)`. All of these will end up being converted into macro
783 // FIXME (pending discussion of #1697, #2178...): local should really be
784 // a refinement on pat.
785 /// Local represents a `let` statement, e.g., `let <pat>:<ty> = <expr>;`
786 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
789 pub ty: Option<P<Ty>>,
790 /// Initializer expression to set the value, if any
791 pub init: Option<P<Expr>>,
794 pub attrs: ThinVec<Attribute>,
797 /// An arm of a 'match'.
799 /// E.g. `0...10 => { println!("match!") }` as in
803 /// 0...10 => { println!("match!") },
804 /// _ => { println!("no match!") },
807 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
809 pub attrs: Vec<Attribute>,
810 pub pats: Vec<P<Pat>>,
811 pub guard: Option<P<Expr>>,
813 pub beginning_vert: Option<Span>, // For RFC 1925 feature gate
816 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
818 pub ident: SpannedIdent,
821 pub is_shorthand: bool,
822 pub attrs: ThinVec<Attribute>,
825 pub type SpannedIdent = Spanned<Ident>;
827 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
828 pub enum BlockCheckMode {
830 Unsafe(UnsafeSource),
833 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
834 pub enum UnsafeSource {
840 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash,)]
845 pub attrs: ThinVec<Attribute>
849 /// Wether this expression would be valid somewhere that expects a value, for example, an `if`
851 pub fn returns(&self) -> bool {
852 if let ExprKind::Block(ref block) = self.node {
853 match block.stmts.last().map(|last_stmt| &last_stmt.node) {
855 Some(&StmtKind::Expr(_)) => true,
856 Some(&StmtKind::Semi(ref expr)) => {
857 if let ExprKind::Ret(_) = expr.node {
858 // last statement is explicit return
864 // This is a block that doesn't end in either an implicit or explicit return
868 // This is not a block, it is a value
874 impl fmt::Debug for Expr {
875 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
876 write!(f, "expr({}: {})", self.id, pprust::expr_to_string(self))
880 /// Limit types of a range (inclusive or exclusive)
881 #[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
882 pub enum RangeLimits {
883 /// Inclusive at the beginning, exclusive at the end
885 /// Inclusive at the beginning and end
889 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
891 /// A `box x` expression.
893 /// First expr is the place; second expr is the value.
894 InPlace(P<Expr>, P<Expr>),
895 /// An array (`[a, b, c, d]`)
899 /// The first field resolves to the function itself,
900 /// and the second field is the list of arguments
901 Call(P<Expr>, Vec<P<Expr>>),
902 /// A method call (`x.foo::<'static, Bar, Baz>(a, b, c, d)`)
904 /// The `PathSegment` represents the method name and its generic arguments
905 /// (within the angle brackets).
906 /// The first element of the vector of `Expr`s is the expression that evaluates
907 /// to the object on which the method is being called on (the receiver),
908 /// and the remaining elements are the rest of the arguments.
909 /// Thus, `x.foo::<Bar, Baz>(a, b, c, d)` is represented as
910 /// `ExprKind::MethodCall(PathSegment { foo, [Bar, Baz] }, [x, a, b, c, d])`.
911 MethodCall(PathSegment, Vec<P<Expr>>),
912 /// A tuple (`(a, b, c ,d)`)
914 /// A binary operation (For example: `a + b`, `a * b`)
915 Binary(BinOp, P<Expr>, P<Expr>),
916 /// A unary operation (For example: `!x`, `*x`)
917 Unary(UnOp, P<Expr>),
918 /// A literal (For example: `1`, `"foo"`)
920 /// A cast (`foo as f64`)
921 Cast(P<Expr>, P<Ty>),
922 Type(P<Expr>, P<Ty>),
923 /// An `if` block, with an optional else block
925 /// `if expr { block } else { expr }`
926 If(P<Expr>, P<Block>, Option<P<Expr>>),
927 /// An `if let` expression with an optional else block
929 /// `if let pat = expr { block } else { expr }`
931 /// This is desugared to a `match` expression.
932 IfLet(P<Pat>, P<Expr>, P<Block>, Option<P<Expr>>),
933 /// A while loop, with an optional label
935 /// `'label: while expr { block }`
936 While(P<Expr>, P<Block>, Option<SpannedIdent>),
937 /// A while-let loop, with an optional label
939 /// `'label: while let pat = expr { block }`
941 /// This is desugared to a combination of `loop` and `match` expressions.
942 WhileLet(P<Pat>, P<Expr>, P<Block>, Option<SpannedIdent>),
943 /// A for loop, with an optional label
945 /// `'label: for pat in expr { block }`
947 /// This is desugared to a combination of `loop` and `match` expressions.
948 ForLoop(P<Pat>, P<Expr>, P<Block>, Option<SpannedIdent>),
949 /// Conditionless loop (can be exited with break, continue, or return)
951 /// `'label: loop { block }`
952 Loop(P<Block>, Option<SpannedIdent>),
954 Match(P<Expr>, Vec<Arm>),
955 /// A closure (for example, `move |a, b, c| a + b + c`)
957 /// The final span is the span of the argument block `|...|`
958 Closure(CaptureBy, P<FnDecl>, P<Expr>, Span),
959 /// A block (`{ ... }`)
961 /// A catch block (`catch { ... }`)
964 /// An assignment (`a = foo()`)
965 Assign(P<Expr>, P<Expr>),
966 /// An assignment with an operator
968 /// For example, `a += 1`.
969 AssignOp(BinOp, P<Expr>, P<Expr>),
970 /// Access of a named struct field (`obj.foo`)
971 Field(P<Expr>, SpannedIdent),
972 /// Access of an unnamed field of a struct or tuple-struct
974 /// For example, `foo.0`.
975 TupField(P<Expr>, Spanned<usize>),
976 /// An indexing operation (`foo[2]`)
977 Index(P<Expr>, P<Expr>),
978 /// A range (`1..2`, `1..`, `..2`, `1...2`, `1...`, `...2`)
979 Range(Option<P<Expr>>, Option<P<Expr>>, RangeLimits),
981 /// Variable reference, possibly containing `::` and/or type
982 /// parameters, e.g. foo::bar::<baz>.
984 /// Optionally "qualified",
985 /// E.g. `<Vec<T> as SomeTrait>::SomeType`.
986 Path(Option<QSelf>, Path),
988 /// A referencing operation (`&a` or `&mut a`)
989 AddrOf(Mutability, P<Expr>),
990 /// A `break`, with an optional label to break, and an optional expression
991 Break(Option<SpannedIdent>, Option<P<Expr>>),
992 /// A `continue`, with an optional label
993 Continue(Option<SpannedIdent>),
994 /// A `return`, with an optional value to be returned
995 Ret(Option<P<Expr>>),
997 /// Output of the `asm!()` macro
998 InlineAsm(P<InlineAsm>),
1000 /// A macro invocation; pre-expansion
1003 /// A struct literal expression.
1005 /// For example, `Foo {x: 1, y: 2}`, or
1006 /// `Foo {x: 1, .. base}`, where `base` is the `Option<Expr>`.
1007 Struct(Path, Vec<Field>, Option<P<Expr>>),
1009 /// An array literal constructed from one repeated element.
1011 /// For example, `[1; 5]`. The first expression is the element
1012 /// to be repeated; the second is the number of times to repeat it.
1013 Repeat(P<Expr>, P<Expr>),
1015 /// No-op: used solely so we can pretty-print faithfully
1021 /// A `yield`, with an optional value to be yielded
1022 Yield(Option<P<Expr>>),
1025 /// The explicit Self type in a "qualified path". The actual
1026 /// path, including the trait and the associated item, is stored
1027 /// separately. `position` represents the index of the associated
1028 /// item qualified with this Self type.
1030 /// ```ignore (only-for-syntax-highlight)
1031 /// <Vec<T> as a::b::Trait>::AssociatedItem
1032 /// ^~~~~ ~~~~~~~~~~~~~~^
1035 /// <Vec<T>>::AssociatedItem
1039 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1045 /// A capture clause
1046 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
1047 pub enum CaptureBy {
1052 pub type Mac = Spanned<Mac_>;
1054 /// Represents a macro invocation. The Path indicates which macro
1055 /// is being invoked, and the vector of token-trees contains the source
1056 /// of the macro invocation.
1058 /// NB: the additional ident for a macro_rules-style macro is actually
1059 /// stored in the enclosing item. Oog.
1060 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1063 pub tts: ThinTokenStream,
1067 pub fn stream(&self) -> TokenStream {
1068 self.tts.clone().into()
1072 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1073 pub struct MacroDef {
1074 pub tokens: ThinTokenStream,
1079 pub fn stream(&self) -> TokenStream {
1080 self.tokens.clone().into()
1084 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
1086 /// A regular string, like `"foo"`
1088 /// A raw string, like `r##"foo"##`
1090 /// The uint is the number of `#` symbols used
1095 pub type Lit = Spanned<LitKind>;
1097 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
1098 pub enum LitIntType {
1106 /// E.g. `"foo"`, `42`, `12.34` or `bool`
1107 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1109 /// A string literal (`"foo"`)
1110 Str(Symbol, StrStyle),
1111 /// A byte string (`b"foo"`)
1112 ByteStr(Rc<Vec<u8>>),
1113 /// A byte char (`b'f'`)
1115 /// A character literal (`'a'`)
1117 /// An integer literal (`1`)
1118 Int(u128, LitIntType),
1119 /// A float literal (`1f64` or `1E10f64`)
1120 Float(Symbol, FloatTy),
1121 /// A float literal without a suffix (`1.0 or 1.0E10`)
1122 FloatUnsuffixed(Symbol),
1123 /// A boolean literal
1128 /// Returns true if this literal is a string and false otherwise.
1129 pub fn is_str(&self) -> bool {
1131 LitKind::Str(..) => true,
1136 /// Returns true if this literal has no suffix. Note: this will return true
1137 /// for literals with prefixes such as raw strings and byte strings.
1138 pub fn is_unsuffixed(&self) -> bool {
1140 // unsuffixed variants
1142 LitKind::ByteStr(..) |
1145 LitKind::Int(_, LitIntType::Unsuffixed) |
1146 LitKind::FloatUnsuffixed(..) |
1147 LitKind::Bool(..) => true,
1148 // suffixed variants
1149 LitKind::Int(_, LitIntType::Signed(..)) |
1150 LitKind::Int(_, LitIntType::Unsigned(..)) |
1151 LitKind::Float(..) => false,
1155 /// Returns true if this literal has a suffix.
1156 pub fn is_suffixed(&self) -> bool {
1157 !self.is_unsuffixed()
1161 // NB: If you change this, you'll probably want to change the corresponding
1162 // type structure in middle/ty.rs as well.
1163 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1166 pub mutbl: Mutability,
1169 /// Represents a method's signature in a trait declaration,
1170 /// or in an implementation.
1171 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1172 pub struct MethodSig {
1173 pub unsafety: Unsafety,
1174 pub constness: Spanned<Constness>,
1176 pub decl: P<FnDecl>,
1177 pub generics: Generics,
1180 /// Represents an item declaration within a trait declaration,
1181 /// possibly including a default implementation. A trait item is
1182 /// either required (meaning it doesn't have an implementation, just a
1183 /// signature) or provided (meaning it has a default implementation).
1184 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1185 pub struct TraitItem {
1188 pub attrs: Vec<Attribute>,
1189 pub node: TraitItemKind,
1191 /// See `Item::tokens` for what this is
1192 pub tokens: Option<TokenStream>,
1195 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1196 pub enum TraitItemKind {
1197 Const(P<Ty>, Option<P<Expr>>),
1198 Method(MethodSig, Option<P<Block>>),
1199 Type(TyParamBounds, Option<P<Ty>>),
1203 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1204 pub struct ImplItem {
1207 pub vis: Visibility,
1208 pub defaultness: Defaultness,
1209 pub attrs: Vec<Attribute>,
1210 pub node: ImplItemKind,
1212 /// See `Item::tokens` for what this is
1213 pub tokens: Option<TokenStream>,
1216 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1217 pub enum ImplItemKind {
1218 Const(P<Ty>, P<Expr>),
1219 Method(MethodSig, P<Block>),
1224 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Copy)]
1234 impl fmt::Debug for IntTy {
1235 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1236 fmt::Display::fmt(self, f)
1240 impl fmt::Display for IntTy {
1241 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1242 write!(f, "{}", self.ty_to_string())
1247 pub fn ty_to_string(&self) -> &'static str {
1249 IntTy::Is => "isize",
1251 IntTy::I16 => "i16",
1252 IntTy::I32 => "i32",
1253 IntTy::I64 => "i64",
1254 IntTy::I128 => "i128",
1258 pub fn val_to_string(&self, val: i128) -> String {
1259 // cast to a u128 so we can correctly print INT128_MIN. All integral types
1260 // are parsed as u128, so we wouldn't want to print an extra negative
1262 format!("{}{}", val as u128, self.ty_to_string())
1265 pub fn bit_width(&self) -> Option<usize> {
1267 IntTy::Is => return None,
1277 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Copy)]
1288 pub fn ty_to_string(&self) -> &'static str {
1290 UintTy::Us => "usize",
1292 UintTy::U16 => "u16",
1293 UintTy::U32 => "u32",
1294 UintTy::U64 => "u64",
1295 UintTy::U128 => "u128",
1299 pub fn val_to_string(&self, val: u128) -> String {
1300 format!("{}{}", val, self.ty_to_string())
1303 pub fn bit_width(&self) -> Option<usize> {
1305 UintTy::Us => return None,
1310 UintTy::U128 => 128,
1315 impl fmt::Debug for UintTy {
1316 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1317 fmt::Display::fmt(self, f)
1321 impl fmt::Display for UintTy {
1322 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1323 write!(f, "{}", self.ty_to_string())
1327 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Copy)]
1333 impl fmt::Debug for FloatTy {
1334 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1335 fmt::Display::fmt(self, f)
1339 impl fmt::Display for FloatTy {
1340 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1341 write!(f, "{}", self.ty_to_string())
1346 pub fn ty_to_string(&self) -> &'static str {
1348 FloatTy::F32 => "f32",
1349 FloatTy::F64 => "f64",
1353 pub fn bit_width(&self) -> usize {
1361 // Bind a type to an associated type: `A=Foo`.
1362 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1363 pub struct TypeBinding {
1370 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash)]
1377 impl fmt::Debug for Ty {
1378 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1379 write!(f, "type({})", pprust::ty_to_string(self))
1383 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1384 pub struct BareFnTy {
1385 pub unsafety: Unsafety,
1387 pub lifetimes: Vec<LifetimeDef>,
1391 /// The different kinds of types recognized by the compiler
1392 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1394 /// A variable-length slice (`[T]`)
1396 /// A fixed length array (`[T; n]`)
1397 Array(P<Ty>, P<Expr>),
1398 /// A raw pointer (`*const T` or `*mut T`)
1400 /// A reference (`&'a T` or `&'a mut T`)
1401 Rptr(Option<Lifetime>, MutTy),
1402 /// A bare function (e.g. `fn(usize) -> bool`)
1403 BareFn(P<BareFnTy>),
1404 /// The never type (`!`)
1406 /// A tuple (`(A, B, C, D,...)`)
1408 /// A path (`module::module::...::Type`), optionally
1409 /// "qualified", e.g. `<Vec<T> as SomeTrait>::SomeType`.
1411 /// Type parameters are stored in the Path itself
1412 Path(Option<QSelf>, Path),
1413 /// A trait object type `Bound1 + Bound2 + Bound3`
1414 /// where `Bound` is a trait or a lifetime.
1415 TraitObject(TyParamBounds),
1416 /// An `impl Bound1 + Bound2 + Bound3` type
1417 /// where `Bound` is a trait or a lifetime.
1418 ImplTrait(TyParamBounds),
1419 /// No-op; kept solely so that we can pretty-print faithfully
1423 /// TyKind::Infer means the type should be inferred instead of it having been
1424 /// specified. This can appear anywhere in a type.
1426 /// Inferred type of a `self` or `&self` argument in a method.
1428 // A macro in the type position.
1430 /// Placeholder for a kind that has failed to be defined.
1434 /// Inline assembly dialect.
1436 /// E.g. `"intel"` as in `asm!("mov eax, 2" : "={eax}"(result) : : : "intel")``
1437 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
1438 pub enum AsmDialect {
1443 /// Inline assembly.
1445 /// E.g. `"={eax}"(result)` as in `asm!("mov eax, 2" : "={eax}"(result) : : : "intel")``
1446 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1447 pub struct InlineAsmOutput {
1448 pub constraint: Symbol,
1451 pub is_indirect: bool,
1454 /// Inline assembly.
1456 /// E.g. `asm!("NOP");`
1457 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1458 pub struct InlineAsm {
1460 pub asm_str_style: StrStyle,
1461 pub outputs: Vec<InlineAsmOutput>,
1462 pub inputs: Vec<(Symbol, P<Expr>)>,
1463 pub clobbers: Vec<Symbol>,
1465 pub alignstack: bool,
1466 pub dialect: AsmDialect,
1467 pub ctxt: SyntaxContext,
1470 /// An argument in a function header.
1472 /// E.g. `bar: usize` as in `fn foo(bar: usize)`
1473 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1480 /// Alternative representation for `Arg`s describing `self` parameter of methods.
1482 /// E.g. `&mut self` as in `fn foo(&mut self)`
1483 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1485 /// `self`, `mut self`
1487 /// `&'lt self`, `&'lt mut self`
1488 Region(Option<Lifetime>, Mutability),
1489 /// `self: TYPE`, `mut self: TYPE`
1490 Explicit(P<Ty>, Mutability),
1493 pub type ExplicitSelf = Spanned<SelfKind>;
1496 pub fn to_self(&self) -> Option<ExplicitSelf> {
1497 if let PatKind::Ident(BindingMode::ByValue(mutbl), ident, _) = self.pat.node {
1498 if ident.node.name == keywords::SelfValue.name() {
1499 return match self.ty.node {
1500 TyKind::ImplicitSelf => Some(respan(self.pat.span, SelfKind::Value(mutbl))),
1501 TyKind::Rptr(lt, MutTy{ref ty, mutbl}) if ty.node == TyKind::ImplicitSelf => {
1502 Some(respan(self.pat.span, SelfKind::Region(lt, mutbl)))
1504 _ => Some(respan(self.pat.span.to(self.ty.span),
1505 SelfKind::Explicit(self.ty.clone(), mutbl))),
1512 pub fn is_self(&self) -> bool {
1513 if let PatKind::Ident(_, ident, _) = self.pat.node {
1514 ident.node.name == keywords::SelfValue.name()
1520 pub fn from_self(eself: ExplicitSelf, eself_ident: SpannedIdent) -> Arg {
1521 let span = eself.span.to(eself_ident.span);
1522 let infer_ty = P(Ty {
1524 node: TyKind::ImplicitSelf,
1527 let arg = |mutbl, ty| Arg {
1530 node: PatKind::Ident(BindingMode::ByValue(mutbl), eself_ident, None),
1537 SelfKind::Explicit(ty, mutbl) => arg(mutbl, ty),
1538 SelfKind::Value(mutbl) => arg(mutbl, infer_ty),
1539 SelfKind::Region(lt, mutbl) => arg(Mutability::Immutable, P(Ty {
1541 node: TyKind::Rptr(lt, MutTy { ty: infer_ty, mutbl: mutbl }),
1548 /// Header (not the body) of a function declaration.
1550 /// E.g. `fn foo(bar: baz)`
1551 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1553 pub inputs: Vec<Arg>,
1554 pub output: FunctionRetTy,
1559 pub fn get_self(&self) -> Option<ExplicitSelf> {
1560 self.inputs.get(0).and_then(Arg::to_self)
1562 pub fn has_self(&self) -> bool {
1563 self.inputs.get(0).map(Arg::is_self).unwrap_or(false)
1567 #[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1573 #[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1574 pub enum Constness {
1579 #[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1580 pub enum Defaultness {
1585 impl fmt::Display for Unsafety {
1586 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1587 fmt::Display::fmt(match *self {
1588 Unsafety::Normal => "normal",
1589 Unsafety::Unsafe => "unsafe",
1594 #[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash)]
1595 pub enum ImplPolarity {
1596 /// `impl Trait for Type`
1598 /// `impl !Trait for Type`
1602 impl fmt::Debug for ImplPolarity {
1603 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1605 ImplPolarity::Positive => "positive".fmt(f),
1606 ImplPolarity::Negative => "negative".fmt(f),
1612 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1613 pub enum FunctionRetTy {
1614 /// Return type is not specified.
1616 /// Functions default to `()` and
1617 /// closures default to inference. Span points to where return
1618 /// type would be inserted.
1624 impl FunctionRetTy {
1625 pub fn span(&self) -> Span {
1627 FunctionRetTy::Default(span) => span,
1628 FunctionRetTy::Ty(ref ty) => ty.span,
1633 /// Module declaration.
1635 /// E.g. `mod foo;` or `mod foo { .. }`
1636 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1638 /// A span from the first token past `{` to the last token until `}`.
1639 /// For `mod foo;`, the inner span ranges from the first token
1640 /// to the last token in the external file.
1642 pub items: Vec<P<Item>>,
1645 /// Foreign module declaration.
1647 /// E.g. `extern { .. }` or `extern C { .. }`
1648 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1649 pub struct ForeignMod {
1651 pub items: Vec<ForeignItem>,
1654 /// Global inline assembly
1656 /// aka module-level assembly or file-scoped assembly
1657 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
1658 pub struct GlobalAsm {
1660 pub ctxt: SyntaxContext,
1663 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1664 pub struct EnumDef {
1665 pub variants: Vec<Variant>,
1668 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1669 pub struct Variant_ {
1671 pub attrs: Vec<Attribute>,
1672 pub data: VariantData,
1673 /// Explicit discriminant, e.g. `Foo = 1`
1674 pub disr_expr: Option<P<Expr>>,
1677 pub type Variant = Spanned<Variant_>;
1679 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
1680 pub struct PathListItem_ {
1682 /// renamed in list, e.g. `use foo::{bar as baz};`
1683 pub rename: Option<Ident>,
1687 pub type PathListItem = Spanned<PathListItem_>;
1689 pub type ViewPath = Spanned<ViewPath_>;
1691 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1692 pub enum ViewPath_ {
1694 /// `foo::bar::baz as quux`
1698 /// `foo::bar::baz` (with `as baz` implicitly on the right)
1699 ViewPathSimple(Ident, Path),
1704 /// `foo::bar::{a,b,c}`
1705 ViewPathList(Path, Vec<PathListItem>)
1709 pub fn path(&self) -> &Path {
1711 ViewPathSimple(_, ref path) |
1712 ViewPathGlob (ref path) |
1713 ViewPathList(ref path, _) => path
1719 /// Distinguishes between Attributes that decorate items and Attributes that
1720 /// are contained as statements within items. These two cases need to be
1721 /// distinguished for pretty-printing.
1722 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
1723 pub enum AttrStyle {
1728 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
1729 pub struct AttrId(pub usize);
1731 /// Meta-data associated with an item
1732 /// Doc-comments are promoted to attributes that have is_sugared_doc = true
1733 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1734 pub struct Attribute {
1736 pub style: AttrStyle,
1738 pub tokens: TokenStream,
1739 pub is_sugared_doc: bool,
1743 /// TraitRef's appear in impls.
1745 /// resolve maps each TraitRef's ref_id to its defining trait; that's all
1746 /// that the ref_id is for. The impl_id maps to the "self type" of this impl.
1747 /// If this impl is an ItemKind::Impl, the impl_id is redundant (it could be the
1748 /// same as the impl's node id).
1749 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1750 pub struct TraitRef {
1755 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1756 pub struct PolyTraitRef {
1757 /// The `'a` in `<'a> Foo<&'a T>`
1758 pub bound_lifetimes: Vec<LifetimeDef>,
1760 /// The `Foo<&'a T>` in `<'a> Foo<&'a T>`
1761 pub trait_ref: TraitRef,
1767 pub fn new(lifetimes: Vec<LifetimeDef>, path: Path, span: Span) -> Self {
1769 bound_lifetimes: lifetimes,
1770 trait_ref: TraitRef { path: path, ref_id: DUMMY_NODE_ID },
1776 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1777 pub enum Visibility {
1780 Restricted { path: P<Path>, id: NodeId },
1784 /// Field of a struct.
1786 /// E.g. `bar: usize` as in `struct Foo { bar: usize }`
1787 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1788 pub struct StructField {
1790 pub ident: Option<Ident>,
1791 pub vis: Visibility,
1794 pub attrs: Vec<Attribute>,
1797 /// Fields and Ids of enum variants and structs
1799 /// For enum variants: `NodeId` represents both an Id of the variant itself (relevant for all
1800 /// variant kinds) and an Id of the variant's constructor (not relevant for `Struct`-variants).
1801 /// One shared Id can be successfully used for these two purposes.
1802 /// Id of the whole enum lives in `Item`.
1804 /// For structs: `NodeId` represents an Id of the structure's constructor, so it is not actually
1805 /// used for `Struct`-structs (but still presents). Structures don't have an analogue of "Id of
1806 /// the variant itself" from enum variants.
1807 /// Id of the whole struct lives in `Item`.
1808 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1809 pub enum VariantData {
1812 /// E.g. `Bar { .. }` as in `enum Foo { Bar { .. } }`
1813 Struct(Vec<StructField>, NodeId),
1816 /// E.g. `Bar(..)` as in `enum Foo { Bar(..) }`
1817 Tuple(Vec<StructField>, NodeId),
1820 /// E.g. `Bar = ..` as in `enum Foo { Bar = .. }`
1825 pub fn fields(&self) -> &[StructField] {
1827 VariantData::Struct(ref fields, _) | VariantData::Tuple(ref fields, _) => fields,
1831 pub fn id(&self) -> NodeId {
1833 VariantData::Struct(_, id) | VariantData::Tuple(_, id) | VariantData::Unit(id) => id
1836 pub fn is_struct(&self) -> bool {
1837 if let VariantData::Struct(..) = *self { true } else { false }
1839 pub fn is_tuple(&self) -> bool {
1840 if let VariantData::Tuple(..) = *self { true } else { false }
1842 pub fn is_unit(&self) -> bool {
1843 if let VariantData::Unit(..) = *self { true } else { false }
1849 /// The name might be a dummy name in case of anonymous items
1850 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1853 pub attrs: Vec<Attribute>,
1856 pub vis: Visibility,
1859 /// Original tokens this item was parsed from. This isn't necessarily
1860 /// available for all items, although over time more and more items should
1861 /// have this be `Some`. Right now this is primarily used for procedural
1862 /// macros, notably custom attributes.
1864 /// Note that the tokens here do not include the outer attributes, but will
1865 /// include inner attributes.
1866 pub tokens: Option<TokenStream>,
1869 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1871 /// An `extern crate` item, with optional original crate name.
1873 /// E.g. `extern crate foo` or `extern crate foo_bar as foo`
1874 ExternCrate(Option<Name>),
1875 /// A use declaration (`use` or `pub use`) item.
1877 /// E.g. `use foo;`, `use foo::bar;` or `use foo::bar as FooBar;`
1879 /// A static item (`static` or `pub static`).
1881 /// E.g. `static FOO: i32 = 42;` or `static FOO: &'static str = "bar";`
1882 Static(P<Ty>, Mutability, P<Expr>),
1883 /// A constant item (`const` or `pub const`).
1885 /// E.g. `const FOO: i32 = 42;`
1886 Const(P<Ty>, P<Expr>),
1887 /// A function declaration (`fn` or `pub fn`).
1889 /// E.g. `fn foo(bar: usize) -> usize { .. }`
1890 Fn(P<FnDecl>, Unsafety, Spanned<Constness>, Abi, Generics, P<Block>),
1891 /// A module declaration (`mod` or `pub mod`).
1893 /// E.g. `mod foo;` or `mod foo { .. }`
1895 /// An external module (`extern` or `pub extern`).
1897 /// E.g. `extern {}` or `extern "C" {}`
1898 ForeignMod(ForeignMod),
1899 /// Module-level inline assembly (from `global_asm!()`)
1900 GlobalAsm(P<GlobalAsm>),
1901 /// A type alias (`type` or `pub type`).
1903 /// E.g. `type Foo = Bar<u8>;`
1904 Ty(P<Ty>, Generics),
1905 /// An enum definition (`enum` or `pub enum`).
1907 /// E.g. `enum Foo<A, B> { C<A>, D<B> }`
1908 Enum(EnumDef, Generics),
1909 /// A struct definition (`struct` or `pub struct`).
1911 /// E.g. `struct Foo<A> { x: A }`
1912 Struct(VariantData, Generics),
1913 /// A union definition (`union` or `pub union`).
1915 /// E.g. `union Foo<A, B> { x: A, y: B }`
1916 Union(VariantData, Generics),
1917 /// A Trait declaration (`trait` or `pub trait`).
1919 /// E.g. `trait Foo { .. }` or `trait Foo<T> { .. }`
1920 Trait(Unsafety, Generics, TyParamBounds, Vec<TraitItem>),
1921 // Default trait implementation.
1923 /// E.g. `impl Trait for .. {}` or `impl<T> Trait<T> for .. {}`
1924 DefaultImpl(Unsafety, TraitRef),
1925 /// An implementation.
1927 /// E.g. `impl<A> Foo<A> { .. }` or `impl<A> Trait for Foo<A> { .. }`
1932 Option<TraitRef>, // (optional) trait this impl implements
1935 /// A macro invocation.
1937 /// E.g. `macro_rules! foo { .. }` or `foo!(..)`
1940 /// A macro definition.
1945 pub fn descriptive_variant(&self) -> &str {
1947 ItemKind::ExternCrate(..) => "extern crate",
1948 ItemKind::Use(..) => "use",
1949 ItemKind::Static(..) => "static item",
1950 ItemKind::Const(..) => "constant item",
1951 ItemKind::Fn(..) => "function",
1952 ItemKind::Mod(..) => "module",
1953 ItemKind::ForeignMod(..) => "foreign module",
1954 ItemKind::GlobalAsm(..) => "global asm",
1955 ItemKind::Ty(..) => "type alias",
1956 ItemKind::Enum(..) => "enum",
1957 ItemKind::Struct(..) => "struct",
1958 ItemKind::Union(..) => "union",
1959 ItemKind::Trait(..) => "trait",
1961 ItemKind::MacroDef(..) |
1962 ItemKind::Impl(..) |
1963 ItemKind::DefaultImpl(..) => "item"
1968 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1969 pub struct ForeignItem {
1971 pub attrs: Vec<Attribute>,
1972 pub node: ForeignItemKind,
1975 pub vis: Visibility,
1978 /// An item within an `extern` block
1979 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1980 pub enum ForeignItemKind {
1981 /// A foreign function
1982 Fn(P<FnDecl>, Generics),
1983 /// A foreign static item (`static ext: u8`), with optional mutability
1984 /// (the boolean is true when mutable)
1985 Static(P<Ty>, bool),
1988 impl ForeignItemKind {
1989 pub fn descriptive_variant(&self) -> &str {
1991 ForeignItemKind::Fn(..) => "foreign function",
1992 ForeignItemKind::Static(..) => "foreign static item"
2002 // are ASTs encodable?
2004 fn check_asts_encodable() {
2005 fn assert_encodable<T: serialize::Encodable>() {}
2006 assert_encodable::<Crate>();