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(),
345 /// A `where` clause in a definition
346 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
347 pub struct WhereClause {
349 pub predicates: Vec<WherePredicate>,
352 /// A single predicate in a `where` clause
353 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
354 pub enum WherePredicate {
355 /// A type binding, e.g. `for<'c> Foo: Send+Clone+'c`
356 BoundPredicate(WhereBoundPredicate),
357 /// A lifetime predicate, e.g. `'a: 'b+'c`
358 RegionPredicate(WhereRegionPredicate),
359 /// An equality predicate (unsupported)
360 EqPredicate(WhereEqPredicate),
365 /// E.g. `for<'c> Foo: Send+Clone+'c`
366 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
367 pub struct WhereBoundPredicate {
369 /// Any lifetimes from a `for` binding
370 pub bound_lifetimes: Vec<LifetimeDef>,
371 /// The type being bounded
372 pub bounded_ty: P<Ty>,
373 /// Trait and lifetime bounds (`Clone+Send+'static`)
374 pub bounds: TyParamBounds,
377 /// A lifetime predicate.
380 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
381 pub struct WhereRegionPredicate {
383 pub lifetime: Lifetime,
384 pub bounds: Vec<Lifetime>,
387 /// An equality predicate (unsupported).
390 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
391 pub struct WhereEqPredicate {
398 /// The set of MetaItems that define the compilation environment of the crate,
399 /// used to drive conditional compilation
400 pub type CrateConfig = HashSet<(Name, Option<Symbol>)>;
402 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
405 pub attrs: Vec<Attribute>,
409 /// A spanned compile-time attribute list item.
410 pub type NestedMetaItem = Spanned<NestedMetaItemKind>;
412 /// Possible values inside of compile-time attribute lists.
414 /// E.g. the '..' in `#[name(..)]`.
415 #[derive(Clone, Eq, RustcEncodable, RustcDecodable, Hash, Debug, PartialEq)]
416 pub enum NestedMetaItemKind {
417 /// A full MetaItem, for recursive meta items.
421 /// E.g. "foo", 64, true
425 /// A spanned compile-time attribute item.
427 /// E.g. `#[test]`, `#[derive(..)]` or `#[feature = "foo"]`
428 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
429 pub struct MetaItem {
431 pub node: MetaItemKind,
435 /// A compile-time attribute item.
437 /// E.g. `#[test]`, `#[derive(..)]` or `#[feature = "foo"]`
438 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
439 pub enum MetaItemKind {
442 /// E.g. `test` as in `#[test]`
446 /// E.g. `derive(..)` as in `#[derive(..)]`
447 List(Vec<NestedMetaItem>),
448 /// Name value meta item.
450 /// E.g. `feature = "foo"` as in `#[feature = "foo"]`
454 /// A Block (`{ .. }`).
456 /// E.g. `{ .. }` as in `fn foo() { .. }`
457 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
459 /// Statements in a block
460 pub stmts: Vec<Stmt>,
462 /// Distinguishes between `unsafe { ... }` and `{ ... }`
463 pub rules: BlockCheckMode,
467 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash)]
474 impl fmt::Debug for Pat {
475 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
476 write!(f, "pat({}: {})", self.id, pprust::pat_to_string(self))
481 pub fn walk<F>(&self, it: &mut F) -> bool
482 where F: FnMut(&Pat) -> bool
489 PatKind::Ident(_, _, Some(ref p)) => p.walk(it),
490 PatKind::Struct(_, ref fields, _) => {
491 fields.iter().all(|field| field.node.pat.walk(it))
493 PatKind::TupleStruct(_, ref s, _) | PatKind::Tuple(ref s, _) => {
494 s.iter().all(|p| p.walk(it))
496 PatKind::Box(ref s) | PatKind::Ref(ref s, _) => {
499 PatKind::Slice(ref before, ref slice, ref after) => {
500 before.iter().all(|p| p.walk(it)) &&
501 slice.iter().all(|p| p.walk(it)) &&
502 after.iter().all(|p| p.walk(it))
516 /// A single field in a struct pattern
518 /// Patterns like the fields of Foo `{ x, ref y, ref mut z }`
519 /// are treated the same as` x: x, y: ref y, z: ref mut z`,
520 /// except is_shorthand is true
521 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
522 pub struct FieldPat {
523 /// The identifier for the field
525 /// The pattern the field is destructured to
527 pub is_shorthand: bool,
528 pub attrs: ThinVec<Attribute>,
531 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
532 pub enum BindingMode {
537 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
543 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
545 /// Represents a wildcard pattern (`_`)
548 /// A `PatKind::Ident` may either be a new bound variable (`ref mut binding @ OPT_SUBPATTERN`),
549 /// or a unit struct/variant pattern, or a const pattern (in the last two cases the third
550 /// field must be `None`). Disambiguation cannot be done with parser alone, so it happens
551 /// during name resolution.
552 Ident(BindingMode, SpannedIdent, Option<P<Pat>>),
554 /// A struct or struct variant pattern, e.g. `Variant {x, y, ..}`.
555 /// The `bool` is `true` in the presence of a `..`.
556 Struct(Path, Vec<Spanned<FieldPat>>, bool),
558 /// A tuple struct/variant pattern `Variant(x, y, .., z)`.
559 /// If the `..` pattern fragment is present, then `Option<usize>` denotes its position.
560 /// 0 <= position <= subpats.len()
561 TupleStruct(Path, Vec<P<Pat>>, Option<usize>),
563 /// A possibly qualified path pattern.
564 /// Unquailfied path patterns `A::B::C` can legally refer to variants, structs, constants
565 /// or associated constants. Quailfied path patterns `<A>::B::C`/`<A as Trait>::B::C` can
566 /// only legally refer to associated constants.
567 Path(Option<QSelf>, Path),
569 /// A tuple pattern `(a, b)`.
570 /// If the `..` pattern fragment is present, then `Option<usize>` denotes its position.
571 /// 0 <= position <= subpats.len()
572 Tuple(Vec<P<Pat>>, Option<usize>),
575 /// A reference pattern, e.g. `&mut (a, b)`
576 Ref(P<Pat>, Mutability),
579 /// A range pattern, e.g. `1...2` or `1..2`
580 Range(P<Expr>, P<Expr>, RangeEnd),
581 /// `[a, b, ..i, y, z]` is represented as:
582 /// `PatKind::Slice(box [a, b], Some(i), box [y, z])`
583 Slice(Vec<P<Pat>>, Option<P<Pat>>, Vec<P<Pat>>),
584 /// A macro pattern; pre-expansion
588 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
589 pub enum Mutability {
594 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
596 /// The `+` operator (addition)
598 /// The `-` operator (subtraction)
600 /// The `*` operator (multiplication)
602 /// The `/` operator (division)
604 /// The `%` operator (modulus)
606 /// The `&&` operator (logical and)
608 /// The `||` operator (logical or)
610 /// The `^` operator (bitwise xor)
612 /// The `&` operator (bitwise and)
614 /// The `|` operator (bitwise or)
616 /// The `<<` operator (shift left)
618 /// The `>>` operator (shift right)
620 /// The `==` operator (equality)
622 /// The `<` operator (less than)
624 /// The `<=` operator (less than or equal to)
626 /// The `!=` operator (not equal to)
628 /// The `>=` operator (greater than or equal to)
630 /// The `>` operator (greater than)
635 pub fn to_string(&self) -> &'static str {
636 use self::BinOpKind::*;
658 pub fn lazy(&self) -> bool {
660 BinOpKind::And | BinOpKind::Or => true,
665 pub fn is_shift(&self) -> bool {
667 BinOpKind::Shl | BinOpKind::Shr => true,
671 pub fn is_comparison(&self) -> bool {
672 use self::BinOpKind::*;
674 Eq | Lt | Le | Ne | Gt | Ge =>
676 And | Or | Add | Sub | Mul | Div | Rem |
677 BitXor | BitAnd | BitOr | Shl | Shr =>
681 /// Returns `true` if the binary operator takes its arguments by value
682 pub fn is_by_value(&self) -> bool {
683 !self.is_comparison()
687 pub type BinOp = Spanned<BinOpKind>;
689 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
691 /// The `*` operator for dereferencing
693 /// The `!` operator for logical inversion
695 /// The `-` operator for negation
700 /// Returns `true` if the unary operator takes its argument by value
701 pub fn is_by_value(u: UnOp) -> bool {
703 UnOp::Neg | UnOp::Not => true,
708 pub fn to_string(op: UnOp) -> &'static str {
718 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash)]
726 pub fn add_trailing_semicolon(mut self) -> Self {
727 self.node = match self.node {
728 StmtKind::Expr(expr) => StmtKind::Semi(expr),
729 StmtKind::Mac(mac) => StmtKind::Mac(mac.map(|(mac, _style, attrs)| {
730 (mac, MacStmtStyle::Semicolon, attrs)
737 pub fn is_item(&self) -> bool {
739 StmtKind::Local(_) => true,
745 impl fmt::Debug for Stmt {
746 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
747 write!(f, "stmt({}: {})", self.id.to_string(), pprust::stmt_to_string(self))
752 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash)]
754 /// A local (let) binding.
757 /// An item definition.
760 /// Expr without trailing semi-colon.
765 Mac(P<(Mac, MacStmtStyle, ThinVec<Attribute>)>),
768 #[derive(Clone, Copy, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
769 pub enum MacStmtStyle {
770 /// The macro statement had a trailing semicolon, e.g. `foo! { ... };`
771 /// `foo!(...);`, `foo![...];`
773 /// The macro statement had braces; e.g. foo! { ... }
775 /// The macro statement had parentheses or brackets and no semicolon; e.g.
776 /// `foo!(...)`. All of these will end up being converted into macro
781 // FIXME (pending discussion of #1697, #2178...): local should really be
782 // a refinement on pat.
783 /// Local represents a `let` statement, e.g., `let <pat>:<ty> = <expr>;`
784 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
787 pub ty: Option<P<Ty>>,
788 /// Initializer expression to set the value, if any
789 pub init: Option<P<Expr>>,
792 pub attrs: ThinVec<Attribute>,
795 /// An arm of a 'match'.
797 /// E.g. `0...10 => { println!("match!") }` as in
801 /// 0...10 => { println!("match!") },
802 /// _ => { println!("no match!") },
805 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
807 pub attrs: Vec<Attribute>,
808 pub pats: Vec<P<Pat>>,
809 pub guard: Option<P<Expr>>,
813 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
815 pub ident: SpannedIdent,
818 pub is_shorthand: bool,
819 pub attrs: ThinVec<Attribute>,
822 pub type SpannedIdent = Spanned<Ident>;
824 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
825 pub enum BlockCheckMode {
827 Unsafe(UnsafeSource),
830 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
831 pub enum UnsafeSource {
837 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash,)]
842 pub attrs: ThinVec<Attribute>
845 impl fmt::Debug for Expr {
846 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
847 write!(f, "expr({}: {})", self.id, pprust::expr_to_string(self))
851 /// Limit types of a range (inclusive or exclusive)
852 #[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
853 pub enum RangeLimits {
854 /// Inclusive at the beginning, exclusive at the end
856 /// Inclusive at the beginning and end
860 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
862 /// A `box x` expression.
864 /// First expr is the place; second expr is the value.
865 InPlace(P<Expr>, P<Expr>),
866 /// An array (`[a, b, c, d]`)
870 /// The first field resolves to the function itself,
871 /// and the second field is the list of arguments
872 Call(P<Expr>, Vec<P<Expr>>),
873 /// A method call (`x.foo::<'static, Bar, Baz>(a, b, c, d)`)
875 /// The `PathSegment` represents the method name and its generic arguments
876 /// (within the angle brackets).
877 /// The first element of the vector of `Expr`s is the expression that evaluates
878 /// to the object on which the method is being called on (the receiver),
879 /// and the remaining elements are the rest of the arguments.
880 /// Thus, `x.foo::<Bar, Baz>(a, b, c, d)` is represented as
881 /// `ExprKind::MethodCall(PathSegment { foo, [Bar, Baz] }, [x, a, b, c, d])`.
882 MethodCall(PathSegment, Vec<P<Expr>>),
883 /// A tuple (`(a, b, c ,d)`)
885 /// A binary operation (For example: `a + b`, `a * b`)
886 Binary(BinOp, P<Expr>, P<Expr>),
887 /// A unary operation (For example: `!x`, `*x`)
888 Unary(UnOp, P<Expr>),
889 /// A literal (For example: `1`, `"foo"`)
891 /// A cast (`foo as f64`)
892 Cast(P<Expr>, P<Ty>),
893 Type(P<Expr>, P<Ty>),
894 /// An `if` block, with an optional else block
896 /// `if expr { block } else { expr }`
897 If(P<Expr>, P<Block>, Option<P<Expr>>),
898 /// An `if let` expression with an optional else block
900 /// `if let pat = expr { block } else { expr }`
902 /// This is desugared to a `match` expression.
903 IfLet(P<Pat>, P<Expr>, P<Block>, Option<P<Expr>>),
904 /// A while loop, with an optional label
906 /// `'label: while expr { block }`
907 While(P<Expr>, P<Block>, Option<SpannedIdent>),
908 /// A while-let loop, with an optional label
910 /// `'label: while let pat = expr { block }`
912 /// This is desugared to a combination of `loop` and `match` expressions.
913 WhileLet(P<Pat>, P<Expr>, P<Block>, Option<SpannedIdent>),
914 /// A for loop, with an optional label
916 /// `'label: for pat in expr { block }`
918 /// This is desugared to a combination of `loop` and `match` expressions.
919 ForLoop(P<Pat>, P<Expr>, P<Block>, Option<SpannedIdent>),
920 /// Conditionless loop (can be exited with break, continue, or return)
922 /// `'label: loop { block }`
923 Loop(P<Block>, Option<SpannedIdent>),
925 Match(P<Expr>, Vec<Arm>),
926 /// A closure (for example, `move |a, b, c| a + b + c`)
928 /// The final span is the span of the argument block `|...|`
929 Closure(CaptureBy, P<FnDecl>, P<Expr>, Span),
930 /// A block (`{ ... }`)
932 /// A catch block (`catch { ... }`)
935 /// An assignment (`a = foo()`)
936 Assign(P<Expr>, P<Expr>),
937 /// An assignment with an operator
939 /// For example, `a += 1`.
940 AssignOp(BinOp, P<Expr>, P<Expr>),
941 /// Access of a named struct field (`obj.foo`)
942 Field(P<Expr>, SpannedIdent),
943 /// Access of an unnamed field of a struct or tuple-struct
945 /// For example, `foo.0`.
946 TupField(P<Expr>, Spanned<usize>),
947 /// An indexing operation (`foo[2]`)
948 Index(P<Expr>, P<Expr>),
949 /// A range (`1..2`, `1..`, `..2`, `1...2`, `1...`, `...2`)
950 Range(Option<P<Expr>>, Option<P<Expr>>, RangeLimits),
952 /// Variable reference, possibly containing `::` and/or type
953 /// parameters, e.g. foo::bar::<baz>.
955 /// Optionally "qualified",
956 /// E.g. `<Vec<T> as SomeTrait>::SomeType`.
957 Path(Option<QSelf>, Path),
959 /// A referencing operation (`&a` or `&mut a`)
960 AddrOf(Mutability, P<Expr>),
961 /// A `break`, with an optional label to break, and an optional expression
962 Break(Option<SpannedIdent>, Option<P<Expr>>),
963 /// A `continue`, with an optional label
964 Continue(Option<SpannedIdent>),
965 /// A `return`, with an optional value to be returned
966 Ret(Option<P<Expr>>),
968 /// Output of the `asm!()` macro
969 InlineAsm(P<InlineAsm>),
971 /// A macro invocation; pre-expansion
974 /// A struct literal expression.
976 /// For example, `Foo {x: 1, y: 2}`, or
977 /// `Foo {x: 1, .. base}`, where `base` is the `Option<Expr>`.
978 Struct(Path, Vec<Field>, Option<P<Expr>>),
980 /// An array literal constructed from one repeated element.
982 /// For example, `[1; 5]`. The first expression is the element
983 /// to be repeated; the second is the number of times to repeat it.
984 Repeat(P<Expr>, P<Expr>),
986 /// No-op: used solely so we can pretty-print faithfully
993 /// The explicit Self type in a "qualified path". The actual
994 /// path, including the trait and the associated item, is stored
995 /// separately. `position` represents the index of the associated
996 /// item qualified with this Self type.
998 /// ```ignore (only-for-syntax-highlight)
999 /// <Vec<T> as a::b::Trait>::AssociatedItem
1000 /// ^~~~~ ~~~~~~~~~~~~~~^
1003 /// <Vec<T>>::AssociatedItem
1007 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1013 /// A capture clause
1014 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
1015 pub enum CaptureBy {
1020 pub type Mac = Spanned<Mac_>;
1022 /// Represents a macro invocation. The Path indicates which macro
1023 /// is being invoked, and the vector of token-trees contains the source
1024 /// of the macro invocation.
1026 /// NB: the additional ident for a macro_rules-style macro is actually
1027 /// stored in the enclosing item. Oog.
1028 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1031 pub tts: ThinTokenStream,
1035 pub fn stream(&self) -> TokenStream {
1036 self.tts.clone().into()
1040 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1041 pub struct MacroDef {
1042 pub tokens: ThinTokenStream,
1047 pub fn stream(&self) -> TokenStream {
1048 self.tokens.clone().into()
1052 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
1054 /// A regular string, like `"foo"`
1056 /// A raw string, like `r##"foo"##`
1058 /// The uint is the number of `#` symbols used
1063 pub type Lit = Spanned<LitKind>;
1065 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
1066 pub enum LitIntType {
1074 /// E.g. `"foo"`, `42`, `12.34` or `bool`
1075 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1077 /// A string literal (`"foo"`)
1078 Str(Symbol, StrStyle),
1079 /// A byte string (`b"foo"`)
1080 ByteStr(Rc<Vec<u8>>),
1081 /// A byte char (`b'f'`)
1083 /// A character literal (`'a'`)
1085 /// An integer literal (`1`)
1086 Int(u128, LitIntType),
1087 /// A float literal (`1f64` or `1E10f64`)
1088 Float(Symbol, FloatTy),
1089 /// A float literal without a suffix (`1.0 or 1.0E10`)
1090 FloatUnsuffixed(Symbol),
1091 /// A boolean literal
1096 /// Returns true if this literal is a string and false otherwise.
1097 pub fn is_str(&self) -> bool {
1099 LitKind::Str(..) => true,
1104 /// Returns true if this literal has no suffix. Note: this will return true
1105 /// for literals with prefixes such as raw strings and byte strings.
1106 pub fn is_unsuffixed(&self) -> bool {
1108 // unsuffixed variants
1110 LitKind::ByteStr(..) |
1113 LitKind::Int(_, LitIntType::Unsuffixed) |
1114 LitKind::FloatUnsuffixed(..) |
1115 LitKind::Bool(..) => true,
1116 // suffixed variants
1117 LitKind::Int(_, LitIntType::Signed(..)) |
1118 LitKind::Int(_, LitIntType::Unsigned(..)) |
1119 LitKind::Float(..) => false,
1123 /// Returns true if this literal has a suffix.
1124 pub fn is_suffixed(&self) -> bool {
1125 !self.is_unsuffixed()
1129 // NB: If you change this, you'll probably want to change the corresponding
1130 // type structure in middle/ty.rs as well.
1131 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1134 pub mutbl: Mutability,
1137 /// Represents a method's signature in a trait declaration,
1138 /// or in an implementation.
1139 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1140 pub struct MethodSig {
1141 pub unsafety: Unsafety,
1142 pub constness: Spanned<Constness>,
1144 pub decl: P<FnDecl>,
1145 pub generics: Generics,
1148 /// Represents an item declaration within a trait declaration,
1149 /// possibly including a default implementation. A trait item is
1150 /// either required (meaning it doesn't have an implementation, just a
1151 /// signature) or provided (meaning it has a default implementation).
1152 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1153 pub struct TraitItem {
1156 pub attrs: Vec<Attribute>,
1157 pub node: TraitItemKind,
1159 /// See `Item::tokens` for what this is
1160 pub tokens: Option<TokenStream>,
1163 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1164 pub enum TraitItemKind {
1165 Const(P<Ty>, Option<P<Expr>>),
1166 Method(MethodSig, Option<P<Block>>),
1167 Type(TyParamBounds, Option<P<Ty>>),
1171 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1172 pub struct ImplItem {
1175 pub vis: Visibility,
1176 pub defaultness: Defaultness,
1177 pub attrs: Vec<Attribute>,
1178 pub node: ImplItemKind,
1180 /// See `Item::tokens` for what this is
1181 pub tokens: Option<TokenStream>,
1184 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1185 pub enum ImplItemKind {
1186 Const(P<Ty>, P<Expr>),
1187 Method(MethodSig, P<Block>),
1192 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Copy)]
1202 impl fmt::Debug for IntTy {
1203 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1204 fmt::Display::fmt(self, f)
1208 impl fmt::Display for IntTy {
1209 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1210 write!(f, "{}", self.ty_to_string())
1215 pub fn ty_to_string(&self) -> &'static str {
1217 IntTy::Is => "isize",
1219 IntTy::I16 => "i16",
1220 IntTy::I32 => "i32",
1221 IntTy::I64 => "i64",
1222 IntTy::I128 => "i128",
1226 pub fn val_to_string(&self, val: i128) -> String {
1227 // cast to a u128 so we can correctly print INT128_MIN. All integral types
1228 // are parsed as u128, so we wouldn't want to print an extra negative
1230 format!("{}{}", val as u128, self.ty_to_string())
1233 pub fn bit_width(&self) -> Option<usize> {
1235 IntTy::Is => return None,
1245 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Copy)]
1256 pub fn ty_to_string(&self) -> &'static str {
1258 UintTy::Us => "usize",
1260 UintTy::U16 => "u16",
1261 UintTy::U32 => "u32",
1262 UintTy::U64 => "u64",
1263 UintTy::U128 => "u128",
1267 pub fn val_to_string(&self, val: u128) -> String {
1268 format!("{}{}", val, self.ty_to_string())
1271 pub fn bit_width(&self) -> Option<usize> {
1273 UintTy::Us => return None,
1278 UintTy::U128 => 128,
1283 impl fmt::Debug for UintTy {
1284 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1285 fmt::Display::fmt(self, f)
1289 impl fmt::Display for UintTy {
1290 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1291 write!(f, "{}", self.ty_to_string())
1295 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Copy)]
1301 impl fmt::Debug for FloatTy {
1302 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1303 fmt::Display::fmt(self, f)
1307 impl fmt::Display for FloatTy {
1308 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1309 write!(f, "{}", self.ty_to_string())
1314 pub fn ty_to_string(&self) -> &'static str {
1316 FloatTy::F32 => "f32",
1317 FloatTy::F64 => "f64",
1321 pub fn bit_width(&self) -> usize {
1329 // Bind a type to an associated type: `A=Foo`.
1330 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1331 pub struct TypeBinding {
1338 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash)]
1345 impl fmt::Debug for Ty {
1346 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1347 write!(f, "type({})", pprust::ty_to_string(self))
1351 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1352 pub struct BareFnTy {
1353 pub unsafety: Unsafety,
1355 pub lifetimes: Vec<LifetimeDef>,
1359 /// The different kinds of types recognized by the compiler
1360 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1362 /// A variable-length slice (`[T]`)
1364 /// A fixed length array (`[T; n]`)
1365 Array(P<Ty>, P<Expr>),
1366 /// A raw pointer (`*const T` or `*mut T`)
1368 /// A reference (`&'a T` or `&'a mut T`)
1369 Rptr(Option<Lifetime>, MutTy),
1370 /// A bare function (e.g. `fn(usize) -> bool`)
1371 BareFn(P<BareFnTy>),
1372 /// The never type (`!`)
1374 /// A tuple (`(A, B, C, D,...)`)
1376 /// A path (`module::module::...::Type`), optionally
1377 /// "qualified", e.g. `<Vec<T> as SomeTrait>::SomeType`.
1379 /// Type parameters are stored in the Path itself
1380 Path(Option<QSelf>, Path),
1381 /// A trait object type `Bound1 + Bound2 + Bound3`
1382 /// where `Bound` is a trait or a lifetime.
1383 TraitObject(TyParamBounds),
1384 /// An `impl Bound1 + Bound2 + Bound3` type
1385 /// where `Bound` is a trait or a lifetime.
1386 ImplTrait(TyParamBounds),
1387 /// No-op; kept solely so that we can pretty-print faithfully
1391 /// TyKind::Infer means the type should be inferred instead of it having been
1392 /// specified. This can appear anywhere in a type.
1394 /// Inferred type of a `self` or `&self` argument in a method.
1396 // A macro in the type position.
1398 /// Placeholder for a kind that has failed to be defined.
1402 /// Inline assembly dialect.
1404 /// E.g. `"intel"` as in `asm!("mov eax, 2" : "={eax}"(result) : : : "intel")``
1405 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
1406 pub enum AsmDialect {
1411 /// Inline assembly.
1413 /// E.g. `"={eax}"(result)` as in `asm!("mov eax, 2" : "={eax}"(result) : : : "intel")``
1414 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1415 pub struct InlineAsmOutput {
1416 pub constraint: Symbol,
1419 pub is_indirect: bool,
1422 /// Inline assembly.
1424 /// E.g. `asm!("NOP");`
1425 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1426 pub struct InlineAsm {
1428 pub asm_str_style: StrStyle,
1429 pub outputs: Vec<InlineAsmOutput>,
1430 pub inputs: Vec<(Symbol, P<Expr>)>,
1431 pub clobbers: Vec<Symbol>,
1433 pub alignstack: bool,
1434 pub dialect: AsmDialect,
1435 pub ctxt: SyntaxContext,
1438 /// An argument in a function header.
1440 /// E.g. `bar: usize` as in `fn foo(bar: usize)`
1441 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1448 /// Alternative representation for `Arg`s describing `self` parameter of methods.
1450 /// E.g. `&mut self` as in `fn foo(&mut self)`
1451 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1453 /// `self`, `mut self`
1455 /// `&'lt self`, `&'lt mut self`
1456 Region(Option<Lifetime>, Mutability),
1457 /// `self: TYPE`, `mut self: TYPE`
1458 Explicit(P<Ty>, Mutability),
1461 pub type ExplicitSelf = Spanned<SelfKind>;
1464 pub fn to_self(&self) -> Option<ExplicitSelf> {
1465 if let PatKind::Ident(BindingMode::ByValue(mutbl), ident, _) = self.pat.node {
1466 if ident.node.name == keywords::SelfValue.name() {
1467 return match self.ty.node {
1468 TyKind::ImplicitSelf => Some(respan(self.pat.span, SelfKind::Value(mutbl))),
1469 TyKind::Rptr(lt, MutTy{ref ty, mutbl}) if ty.node == TyKind::ImplicitSelf => {
1470 Some(respan(self.pat.span, SelfKind::Region(lt, mutbl)))
1472 _ => Some(respan(self.pat.span.to(self.ty.span),
1473 SelfKind::Explicit(self.ty.clone(), mutbl))),
1480 pub fn is_self(&self) -> bool {
1481 if let PatKind::Ident(_, ident, _) = self.pat.node {
1482 ident.node.name == keywords::SelfValue.name()
1488 pub fn from_self(eself: ExplicitSelf, eself_ident: SpannedIdent) -> Arg {
1489 let span = eself.span.to(eself_ident.span);
1490 let infer_ty = P(Ty {
1492 node: TyKind::ImplicitSelf,
1495 let arg = |mutbl, ty| Arg {
1498 node: PatKind::Ident(BindingMode::ByValue(mutbl), eself_ident, None),
1505 SelfKind::Explicit(ty, mutbl) => arg(mutbl, ty),
1506 SelfKind::Value(mutbl) => arg(mutbl, infer_ty),
1507 SelfKind::Region(lt, mutbl) => arg(Mutability::Immutable, P(Ty {
1509 node: TyKind::Rptr(lt, MutTy { ty: infer_ty, mutbl: mutbl }),
1516 /// Header (not the body) of a function declaration.
1518 /// E.g. `fn foo(bar: baz)`
1519 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1521 pub inputs: Vec<Arg>,
1522 pub output: FunctionRetTy,
1527 pub fn get_self(&self) -> Option<ExplicitSelf> {
1528 self.inputs.get(0).and_then(Arg::to_self)
1530 pub fn has_self(&self) -> bool {
1531 self.inputs.get(0).map(Arg::is_self).unwrap_or(false)
1535 #[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1541 #[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1542 pub enum Constness {
1547 #[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1548 pub enum Defaultness {
1553 impl fmt::Display for Unsafety {
1554 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1555 fmt::Display::fmt(match *self {
1556 Unsafety::Normal => "normal",
1557 Unsafety::Unsafe => "unsafe",
1562 #[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash)]
1563 pub enum ImplPolarity {
1564 /// `impl Trait for Type`
1566 /// `impl !Trait for Type`
1570 impl fmt::Debug for ImplPolarity {
1571 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1573 ImplPolarity::Positive => "positive".fmt(f),
1574 ImplPolarity::Negative => "negative".fmt(f),
1580 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1581 pub enum FunctionRetTy {
1582 /// Return type is not specified.
1584 /// Functions default to `()` and
1585 /// closures default to inference. Span points to where return
1586 /// type would be inserted.
1592 impl FunctionRetTy {
1593 pub fn span(&self) -> Span {
1595 FunctionRetTy::Default(span) => span,
1596 FunctionRetTy::Ty(ref ty) => ty.span,
1601 /// Module declaration.
1603 /// E.g. `mod foo;` or `mod foo { .. }`
1604 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1606 /// A span from the first token past `{` to the last token until `}`.
1607 /// For `mod foo;`, the inner span ranges from the first token
1608 /// to the last token in the external file.
1610 pub items: Vec<P<Item>>,
1613 /// Foreign module declaration.
1615 /// E.g. `extern { .. }` or `extern C { .. }`
1616 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1617 pub struct ForeignMod {
1619 pub items: Vec<ForeignItem>,
1622 /// Global inline assembly
1624 /// aka module-level assembly or file-scoped assembly
1625 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
1626 pub struct GlobalAsm {
1628 pub ctxt: SyntaxContext,
1631 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1632 pub struct EnumDef {
1633 pub variants: Vec<Variant>,
1636 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1637 pub struct Variant_ {
1639 pub attrs: Vec<Attribute>,
1640 pub data: VariantData,
1641 /// Explicit discriminant, e.g. `Foo = 1`
1642 pub disr_expr: Option<P<Expr>>,
1645 pub type Variant = Spanned<Variant_>;
1647 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
1648 pub struct PathListItem_ {
1650 /// renamed in list, e.g. `use foo::{bar as baz};`
1651 pub rename: Option<Ident>,
1655 pub type PathListItem = Spanned<PathListItem_>;
1657 pub type ViewPath = Spanned<ViewPath_>;
1659 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1660 pub enum ViewPath_ {
1662 /// `foo::bar::baz as quux`
1666 /// `foo::bar::baz` (with `as baz` implicitly on the right)
1667 ViewPathSimple(Ident, Path),
1672 /// `foo::bar::{a,b,c}`
1673 ViewPathList(Path, Vec<PathListItem>)
1677 pub fn path(&self) -> &Path {
1679 ViewPathSimple(_, ref path) |
1680 ViewPathGlob (ref path) |
1681 ViewPathList(ref path, _) => path
1687 /// Distinguishes between Attributes that decorate items and Attributes that
1688 /// are contained as statements within items. These two cases need to be
1689 /// distinguished for pretty-printing.
1690 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
1691 pub enum AttrStyle {
1696 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
1697 pub struct AttrId(pub usize);
1699 /// Meta-data associated with an item
1700 /// Doc-comments are promoted to attributes that have is_sugared_doc = true
1701 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1702 pub struct Attribute {
1704 pub style: AttrStyle,
1706 pub tokens: TokenStream,
1707 pub is_sugared_doc: bool,
1711 /// TraitRef's appear in impls.
1713 /// resolve maps each TraitRef's ref_id to its defining trait; that's all
1714 /// that the ref_id is for. The impl_id maps to the "self type" of this impl.
1715 /// If this impl is an ItemKind::Impl, the impl_id is redundant (it could be the
1716 /// same as the impl's node id).
1717 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1718 pub struct TraitRef {
1723 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1724 pub struct PolyTraitRef {
1725 /// The `'a` in `<'a> Foo<&'a T>`
1726 pub bound_lifetimes: Vec<LifetimeDef>,
1728 /// The `Foo<&'a T>` in `<'a> Foo<&'a T>`
1729 pub trait_ref: TraitRef,
1735 pub fn new(lifetimes: Vec<LifetimeDef>, path: Path, span: Span) -> Self {
1737 bound_lifetimes: lifetimes,
1738 trait_ref: TraitRef { path: path, ref_id: DUMMY_NODE_ID },
1744 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1745 pub enum Visibility {
1748 Restricted { path: P<Path>, id: NodeId },
1752 /// Field of a struct.
1754 /// E.g. `bar: usize` as in `struct Foo { bar: usize }`
1755 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1756 pub struct StructField {
1758 pub ident: Option<Ident>,
1759 pub vis: Visibility,
1762 pub attrs: Vec<Attribute>,
1765 /// Fields and Ids of enum variants and structs
1767 /// For enum variants: `NodeId` represents both an Id of the variant itself (relevant for all
1768 /// variant kinds) and an Id of the variant's constructor (not relevant for `Struct`-variants).
1769 /// One shared Id can be successfully used for these two purposes.
1770 /// Id of the whole enum lives in `Item`.
1772 /// For structs: `NodeId` represents an Id of the structure's constructor, so it is not actually
1773 /// used for `Struct`-structs (but still presents). Structures don't have an analogue of "Id of
1774 /// the variant itself" from enum variants.
1775 /// Id of the whole struct lives in `Item`.
1776 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1777 pub enum VariantData {
1780 /// E.g. `Bar { .. }` as in `enum Foo { Bar { .. } }`
1781 Struct(Vec<StructField>, NodeId),
1784 /// E.g. `Bar(..)` as in `enum Foo { Bar(..) }`
1785 Tuple(Vec<StructField>, NodeId),
1788 /// E.g. `Bar = ..` as in `enum Foo { Bar = .. }`
1793 pub fn fields(&self) -> &[StructField] {
1795 VariantData::Struct(ref fields, _) | VariantData::Tuple(ref fields, _) => fields,
1799 pub fn id(&self) -> NodeId {
1801 VariantData::Struct(_, id) | VariantData::Tuple(_, id) | VariantData::Unit(id) => id
1804 pub fn is_struct(&self) -> bool {
1805 if let VariantData::Struct(..) = *self { true } else { false }
1807 pub fn is_tuple(&self) -> bool {
1808 if let VariantData::Tuple(..) = *self { true } else { false }
1810 pub fn is_unit(&self) -> bool {
1811 if let VariantData::Unit(..) = *self { true } else { false }
1817 /// The name might be a dummy name in case of anonymous items
1818 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1821 pub attrs: Vec<Attribute>,
1824 pub vis: Visibility,
1827 /// Original tokens this item was parsed from. This isn't necessarily
1828 /// available for all items, although over time more and more items should
1829 /// have this be `Some`. Right now this is primarily used for procedural
1830 /// macros, notably custom attributes.
1832 /// Note that the tokens here do not include the outer attributes, but will
1833 /// include inner attributes.
1834 pub tokens: Option<TokenStream>,
1837 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1839 /// An`extern crate` item, with optional original crate name.
1841 /// E.g. `extern crate foo` or `extern crate foo_bar as foo`
1842 ExternCrate(Option<Name>),
1843 /// A use declaration (`use` or `pub use`) item.
1845 /// E.g. `use foo;`, `use foo::bar;` or `use foo::bar as FooBar;`
1847 /// A static item (`static` or `pub static`).
1849 /// E.g. `static FOO: i32 = 42;` or `static FOO: &'static str = "bar";`
1850 Static(P<Ty>, Mutability, P<Expr>),
1851 /// A constant item (`const` or `pub const`).
1853 /// E.g. `const FOO: i32 = 42;`
1854 Const(P<Ty>, P<Expr>),
1855 /// A function declaration (`fn` or `pub fn`).
1857 /// E.g. `fn foo(bar: usize) -> usize { .. }`
1858 Fn(P<FnDecl>, Unsafety, Spanned<Constness>, Abi, Generics, P<Block>),
1859 /// A module declaration (`mod` or `pub mod`).
1861 /// E.g. `mod foo;` or `mod foo { .. }`
1863 /// An external module (`extern` or `pub extern`).
1865 /// E.g. `extern {}` or `extern "C" {}`
1866 ForeignMod(ForeignMod),
1867 /// Module-level inline assembly (from `global_asm!()`)
1868 GlobalAsm(P<GlobalAsm>),
1869 /// A type alias (`type` or `pub type`).
1871 /// E.g. `type Foo = Bar<u8>;`
1872 Ty(P<Ty>, Generics),
1873 /// An enum definition (`enum` or `pub enum`).
1875 /// E.g. `enum Foo<A, B> { C<A>, D<B> }`
1876 Enum(EnumDef, Generics),
1877 /// A struct definition (`struct` or `pub struct`).
1879 /// E.g. `struct Foo<A> { x: A }`
1880 Struct(VariantData, Generics),
1881 /// A union definition (`union` or `pub union`).
1883 /// E.g. `union Foo<A, B> { x: A, y: B }`
1884 Union(VariantData, Generics),
1885 /// A Trait declaration (`trait` or `pub trait`).
1887 /// E.g. `trait Foo { .. }` or `trait Foo<T> { .. }`
1888 Trait(Unsafety, Generics, TyParamBounds, Vec<TraitItem>),
1889 // Default trait implementation.
1891 /// E.g. `impl Trait for .. {}` or `impl<T> Trait<T> for .. {}`
1892 DefaultImpl(Unsafety, TraitRef),
1893 /// An implementation.
1895 /// E.g. `impl<A> Foo<A> { .. }` or `impl<A> Trait for Foo<A> { .. }`
1900 Option<TraitRef>, // (optional) trait this impl implements
1903 /// A macro invocation.
1905 /// E.g. `macro_rules! foo { .. }` or `foo!(..)`
1908 /// A macro definition.
1913 pub fn descriptive_variant(&self) -> &str {
1915 ItemKind::ExternCrate(..) => "extern crate",
1916 ItemKind::Use(..) => "use",
1917 ItemKind::Static(..) => "static item",
1918 ItemKind::Const(..) => "constant item",
1919 ItemKind::Fn(..) => "function",
1920 ItemKind::Mod(..) => "module",
1921 ItemKind::ForeignMod(..) => "foreign module",
1922 ItemKind::GlobalAsm(..) => "global asm",
1923 ItemKind::Ty(..) => "type alias",
1924 ItemKind::Enum(..) => "enum",
1925 ItemKind::Struct(..) => "struct",
1926 ItemKind::Union(..) => "union",
1927 ItemKind::Trait(..) => "trait",
1929 ItemKind::MacroDef(..) |
1930 ItemKind::Impl(..) |
1931 ItemKind::DefaultImpl(..) => "item"
1936 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1937 pub struct ForeignItem {
1939 pub attrs: Vec<Attribute>,
1940 pub node: ForeignItemKind,
1943 pub vis: Visibility,
1946 /// An item within an `extern` block
1947 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
1948 pub enum ForeignItemKind {
1949 /// A foreign function
1950 Fn(P<FnDecl>, Generics),
1951 /// A foreign static item (`static ext: u8`), with optional mutability
1952 /// (the boolean is true when mutable)
1953 Static(P<Ty>, bool),
1956 impl ForeignItemKind {
1957 pub fn descriptive_variant(&self) -> &str {
1959 ForeignItemKind::Fn(..) => "foreign function",
1960 ForeignItemKind::Static(..) => "foreign static item"
1970 // are ASTs encodable?
1972 fn check_asts_encodable() {
1973 fn assert_encodable<T: serialize::Encodable>() {}
1974 assert_encodable::<Crate>();