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https://github.com/rust-lang/rust.git
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Rollup merge of #23428 - Manishearth:ast-doc, r=huon
I often have to run `ast-json` or look into the pretty-printer source to figure out what the fields of an AST enum mean. I've tried to document most of what I know (and some semi-obvious stuff). r? @steveklabnik f? @eddyb
This commit is contained in:
Manish Goregaokar
commit
2a106d68f4
@ -150,7 +150,7 @@ impl PartialEq for Ident {
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/// A SyntaxContext represents a chain of macro-expandings
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/// and renamings. Each macro expansion corresponds to
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/// a fresh usize
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/// a fresh u32
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// I'm representing this syntax context as an index into
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// a table, in order to work around a compiler bug
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@ -216,6 +216,7 @@ pub struct Lifetime {
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}
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#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
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/// A lifetime definition, eg `'a: 'b+'c+'d`
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pub struct LifetimeDef {
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pub lifetime: Lifetime,
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pub bounds: Vec<Lifetime>
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@ -251,7 +252,9 @@ pub struct PathSegment {
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#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
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pub enum PathParameters {
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/// The `<'a, A,B,C>` in `foo::bar::baz::<'a, A,B,C>`
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AngleBracketedParameters(AngleBracketedParameterData),
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/// The `(A,B)` and `C` in `Foo(A,B) -> C`
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ParenthesizedParameters(ParenthesizedParameterData),
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}
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@ -436,27 +439,37 @@ impl Generics {
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}
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}
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/// A `where` clause in a definition
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#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
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pub struct WhereClause {
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pub id: NodeId,
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pub predicates: Vec<WherePredicate>,
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}
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/// A single predicate in a `where` clause
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#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
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pub enum WherePredicate {
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/// A type binding, eg `for<'c> Foo: Send+Clone+'c`
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BoundPredicate(WhereBoundPredicate),
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/// A lifetime predicate, e.g. `'a: 'b+'c`
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RegionPredicate(WhereRegionPredicate),
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/// An equality predicate (unsupported)
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EqPredicate(WhereEqPredicate)
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}
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/// A type bound, eg `for<'c> Foo: Send+Clone+'c`
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#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
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pub struct WhereBoundPredicate {
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pub span: Span,
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/// Any lifetimes from a `for` binding
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pub bound_lifetimes: Vec<LifetimeDef>,
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/// The type being bounded
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pub bounded_ty: P<Ty>,
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/// Trait and lifetime bounds (`Clone+Send+'static`)
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pub bounds: OwnedSlice<TyParamBound>,
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}
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/// A lifetime predicate, e.g. `'a: 'b+'c`
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#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
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pub struct WhereRegionPredicate {
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pub span: Span,
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@ -464,6 +477,7 @@ pub struct WhereRegionPredicate {
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pub bounds: Vec<Lifetime>,
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}
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/// An equality predicate (unsupported), e.g. `T=int`
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#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
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pub struct WhereEqPredicate {
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pub id: NodeId,
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@ -521,9 +535,13 @@ impl PartialEq for MetaItem_ {
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#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
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pub struct Block {
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/// Statements in a block
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pub stmts: Vec<P<Stmt>>,
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/// An expression at the end of the block
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/// without a semicolon, if any
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pub expr: Option<P<Expr>>,
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pub id: NodeId,
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/// Distinguishes between `unsafe { ... }` and `{ ... }`
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pub rules: BlockCheckMode,
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pub span: Span,
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}
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@ -535,9 +553,16 @@ pub struct Pat {
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pub span: Span,
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}
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/// A single field in a struct pattern
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///
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/// Patterns like the fields of Foo `{ x, ref y, ref mut z }`
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/// are treated the same as` x: x, y: ref y, z: ref mut z`,
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/// except is_shorthand is true
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#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
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pub struct FieldPat {
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/// The identifier for the field
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pub ident: Ident,
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/// The pattern the field is destructured to
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pub pat: P<Pat>,
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pub is_shorthand: bool,
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}
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@ -574,15 +599,23 @@ pub enum Pat_ {
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/// "None" means a * pattern where we don't bind the fields to names.
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PatEnum(Path, Option<Vec<P<Pat>>>),
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/// Destructuring of a struct, e.g. `Foo {x, y, ..}`
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/// The `bool` is `true` in the presence of a `..`
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PatStruct(Path, Vec<Spanned<FieldPat>>, bool),
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/// A tuple pattern `(a, b)`
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PatTup(Vec<P<Pat>>),
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/// A `box` pattern
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PatBox(P<Pat>),
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PatRegion(P<Pat>, Mutability), // reference pattern
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/// A reference pattern, e.g. `&mut (a, b)`
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PatRegion(P<Pat>, Mutability),
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/// A literal
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PatLit(P<Expr>),
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/// A range pattern, e.g. `1...2`
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PatRange(P<Expr>, P<Expr>),
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/// [a, b, ..i, y, z] is represented as:
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/// PatVec(box [a, b], Some(i), box [y, z])
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PatVec(Vec<P<Pat>>, Option<P<Pat>>, Vec<P<Pat>>),
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/// A macro pattern; pre-expansion
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PatMac(Mac),
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}
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@ -594,23 +627,41 @@ pub enum Mutability {
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#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
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pub enum BinOp_ {
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/// The `+` operator (addition)
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BiAdd,
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/// The `-` operator (subtraction)
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BiSub,
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/// The `*` operator (multiplication)
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BiMul,
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/// The `/` operator (division)
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BiDiv,
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/// The `%` operator (modulus)
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BiRem,
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/// The `&&` operator (logical and)
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BiAnd,
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/// The `||` operator (logical or)
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BiOr,
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/// The `^` operator (bitwise xor)
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BiBitXor,
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/// The `&` operator (bitwise and)
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BiBitAnd,
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/// The `|` operator (bitwise or)
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BiBitOr,
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/// The `<<` operator (shift left)
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BiShl,
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/// The `>>` operator (shift right)
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BiShr,
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/// The `==` operator (equality)
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BiEq,
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/// The `<` operator (less than)
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BiLt,
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/// The `<=` operator (less than or equal to)
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BiLe,
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/// The `!=` operator (not equal to)
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BiNe,
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/// The `>=` operator (greater than or equal to)
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BiGe,
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/// The `>` operator (greater than)
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BiGt,
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}
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@ -618,12 +669,17 @@ pub type BinOp = Spanned<BinOp_>;
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#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
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pub enum UnOp {
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/// The `box` operator
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UnUniq,
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/// The `*` operator for dereferencing
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UnDeref,
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/// The `!` operator for logical inversion
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UnNot,
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/// The `-` operator for negation
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UnNeg
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}
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/// A statement
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pub type Stmt = Spanned<Stmt_>;
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#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
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@ -668,6 +724,7 @@ pub enum LocalSource {
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pub struct Local {
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pub pat: P<Pat>,
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pub ty: Option<P<Ty>>,
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/// Initializer expression to set the value, if any
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pub init: Option<P<Expr>>,
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pub id: NodeId,
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pub span: Span,
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@ -714,6 +771,7 @@ pub enum UnsafeSource {
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UserProvided,
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}
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/// An expression
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#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
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pub struct Expr {
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pub id: NodeId,
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@ -725,34 +783,78 @@ pub struct Expr {
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pub enum Expr_ {
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/// First expr is the place; second expr is the value.
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ExprBox(Option<P<Expr>>, P<Expr>),
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/// An array (`[a, b, c, d]`)
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ExprVec(Vec<P<Expr>>),
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/// A function call
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/// The first field resolves to the function itself,
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/// and the second field is the list of arguments
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ExprCall(P<Expr>, Vec<P<Expr>>),
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/// A method call (`x.foo::<Bar, Baz>(a, b, c, d)`)
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/// The `SpannedIdent` is the identifier for the method name
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/// The vector of `Ty`s are the ascripted type parameters for the method
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/// (within the angle brackets)
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/// The first element of the vector of `Expr`s is the expression that evaluates
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/// to the object on which the method is being called on (the receiver),
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/// and the remaining elements are the rest of the arguments.
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/// Thus, `x.foo::<Bar, Baz>(a, b, c, d)` is represented as
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/// `ExprMethodCall(foo, [Bar, Baz], [x, a, b, c, d])`
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ExprMethodCall(SpannedIdent, Vec<P<Ty>>, Vec<P<Expr>>),
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/// A tuple (`(a, b, c ,d)`)
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ExprTup(Vec<P<Expr>>),
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/// A binary operation (For example: `a + b`, `a * b`)
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ExprBinary(BinOp, P<Expr>, P<Expr>),
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/// A unary operation (For example: `!x`, `*x`)
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ExprUnary(UnOp, P<Expr>),
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/// A literal (For example: `1u8`, `"foo"`)
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ExprLit(P<Lit>),
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/// A cast (`foo as f64`)
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ExprCast(P<Expr>, P<Ty>),
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/// An `if` block, with an optional else block
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/// `if expr { block } else { expr }`
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ExprIf(P<Expr>, P<Block>, Option<P<Expr>>),
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/// An `if let` expression with an optional else block
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/// `if let pat = expr { block } else { expr }`
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/// This is desugared to a `match` expression
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ExprIfLet(P<Pat>, P<Expr>, P<Block>, Option<P<Expr>>),
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// FIXME #6993: change to Option<Name> ... or not, if these are hygienic.
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/// A while loop, with an optional label
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/// `'label: while expr { block }`
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ExprWhile(P<Expr>, P<Block>, Option<Ident>),
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// FIXME #6993: change to Option<Name> ... or not, if these are hygienic.
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/// A while-let loop, with an optional label
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/// `'label: while let pat = expr { block }`
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/// This is desugared to a combination of `loop` and `match` expressions
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ExprWhileLet(P<Pat>, P<Expr>, P<Block>, Option<Ident>),
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// FIXME #6993: change to Option<Name> ... or not, if these are hygienic.
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/// A for loop, with an optional label
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/// `'label: for pat in expr { block }`
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/// This is desugared to a combination of `loop` and `match` expressions
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ExprForLoop(P<Pat>, P<Expr>, P<Block>, Option<Ident>),
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// Conditionless loop (can be exited with break, cont, or ret)
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/// Conditionless loop (can be exited with break, continue, or return)
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/// `'label: loop { block }`
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// FIXME #6993: change to Option<Name> ... or not, if these are hygienic.
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ExprLoop(P<Block>, Option<Ident>),
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/// A `match` block, with a source that indicates whether or not it is
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/// the result of a desugaring, and if so, which kind
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ExprMatch(P<Expr>, Vec<Arm>, MatchSource),
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/// A closure (for example, `move |a, b, c| {a + b + c}`)
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ExprClosure(CaptureClause, P<FnDecl>, P<Block>),
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/// A block (`{ ... }`)
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ExprBlock(P<Block>),
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/// An assignment (`a = foo()`)
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ExprAssign(P<Expr>, P<Expr>),
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/// An assignment with an operator
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/// For example, `a += 1`
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ExprAssignOp(BinOp, P<Expr>, P<Expr>),
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/// Access of a named struct field (`obj.foo`)
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ExprField(P<Expr>, SpannedIdent),
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/// Access of an unnamed field of a struct or tuple-struct
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/// For example, `foo.0`
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ExprTupField(P<Expr>, Spanned<usize>),
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/// An indexing operation (`foo[2]`)
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ExprIndex(P<Expr>, P<Expr>),
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/// A range (`1..2`, `1..`, or `..2`)
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ExprRange(Option<P<Expr>>, Option<P<Expr>>),
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/// Variable reference, possibly containing `::` and/or type
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@ -760,20 +862,30 @@ pub enum Expr_ {
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/// e.g. `<Vec<T> as SomeTrait>::SomeType`.
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ExprPath(Option<QSelf>, Path),
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/// A referencing operation (`&a` or `&mut a`)
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ExprAddrOf(Mutability, P<Expr>),
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/// A `break`, with an optional label to break
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ExprBreak(Option<Ident>),
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/// A `continue`, with an optional label
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ExprAgain(Option<Ident>),
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/// A `return`, with an optional value to be returned
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ExprRet(Option<P<Expr>>),
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/// Output of the `asm!()` macro
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ExprInlineAsm(InlineAsm),
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/// A macro invocation; pre-expansion
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ExprMac(Mac),
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/// A struct literal expression.
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ExprStruct(Path, Vec<Field>, Option<P<Expr>> /* base */),
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/// For example, `Foo {x: 1, y: 2}`, or
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/// `Foo {x: 1, .. base}`, where `base` is the `Option<Expr>`
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ExprStruct(Path, Vec<Field>, Option<P<Expr>>),
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/// A vector literal constructed from one repeated element.
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ExprRepeat(P<Expr> /* element */, P<Expr> /* count */),
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/// For example, `[1u8; 5]`. The first expression is the element
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/// to be repeated; the second is the number of times to repeat it
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ExprRepeat(P<Expr>, P<Expr>),
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/// No-op: used solely so we can pretty-print faithfully
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ExprParen(P<Expr>)
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@ -880,7 +992,6 @@ pub enum KleeneOp {
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/// The RHS of an MBE macro is the only place `SubstNt`s are substituted.
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/// Nothing special happens to misnamed or misplaced `SubstNt`s.
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#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
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#[doc="For macro invocations; parsing is delegated to the macro"]
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pub enum TokenTree {
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/// A single token
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TtToken(Span, token::Token),
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@ -991,10 +1102,14 @@ pub enum Mac_ {
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#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
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pub enum StrStyle {
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/// A regular string, like `"foo"`
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CookedStr,
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/// A raw string, like `r##"foo"##`
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/// The uint is the number of `#` symbols used
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RawStr(usize)
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}
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/// A literal
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pub type Lit = Spanned<Lit_>;
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#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
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@ -1032,13 +1147,21 @@ impl LitIntType {
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#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
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pub enum Lit_ {
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/// A string literal (`"foo"`)
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LitStr(InternedString, StrStyle),
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/// A byte string (`b"foo"`)
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LitBinary(Rc<Vec<u8>>),
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/// A byte char (`b'f'`)
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LitByte(u8),
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/// A character literal (`'a'`)
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LitChar(char),
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/// An integer liteal (`1u8`)
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LitInt(u64, LitIntType),
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/// A float literal (`1f64` or `1E10f64`)
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LitFloat(InternedString, FloatTy),
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/// A float literal without a suffix (`1.0 or 1.0E10`)
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LitFloatUnsuffixed(InternedString),
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/// A boolean literal
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LitBool(bool),
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}
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@ -1361,9 +1484,9 @@ impl fmt::Display for Unsafety {
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#[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash)]
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pub enum ImplPolarity {
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/// impl Trait for Type
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/// `impl Trait for Type`
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Positive,
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/// impl !Trait for Type
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/// `impl !Trait for Type`
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Negative,
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}
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@ -1379,10 +1502,10 @@ impl fmt::Debug for ImplPolarity {
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#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
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pub enum FunctionRetTy {
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/// Functions with return type ! that always
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/// Functions with return type `!`that always
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/// raise an error or exit (i.e. never return to the caller)
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NoReturn(Span),
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/// Return type is not specified. Functions default to () and
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/// Return type is not specified. Functions default to `()` and
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/// closures default to inference. Span points to where return
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/// type would be inserted.
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DefaultReturn(Span),
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@ -1438,7 +1561,9 @@ pub struct VariantArg {
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#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
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pub enum VariantKind {
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/// Tuple variant, e.g. `Foo(A, B)`
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TupleVariantKind(Vec<VariantArg>),
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/// Struct variant, e.g. `Foo {x: A, y: B}`
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StructVariantKind(P<StructDef>),
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}
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@ -1453,6 +1578,7 @@ pub struct Variant_ {
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pub attrs: Vec<Attribute>,
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pub kind: VariantKind,
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pub id: NodeId,
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/// Explicit discriminant, eg `Foo = 1`
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pub disr_expr: Option<P<Expr>>,
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pub vis: Visibility,
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}
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@ -1603,6 +1729,9 @@ pub struct StructDef {
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FIXME (#3300): Should allow items to be anonymous. Right now
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we just use dummy names for anon items.
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*/
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/// An item
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///
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/// The name might be a dummy name in case of anonymous items
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#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
|
||||
pub struct Item {
|
||||
pub ident: Ident,
|
||||
@ -1615,19 +1744,27 @@ pub struct Item {
|
||||
|
||||
#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
|
||||
pub enum Item_ {
|
||||
// Optional location (containing arbitrary characters) from which
|
||||
// to fetch the crate sources.
|
||||
// For example, extern crate whatever = "github.com/rust-lang/rust".
|
||||
/// An`extern crate` item, with optional original crate name,
|
||||
/// e.g. `extern crate foo` or `extern crate "foo-bar" as foo`
|
||||
ItemExternCrate(Option<(InternedString, StrStyle)>),
|
||||
/// A `use` or `pub use` item
|
||||
ItemUse(P<ViewPath>),
|
||||
|
||||
/// A `static` item
|
||||
ItemStatic(P<Ty>, Mutability, P<Expr>),
|
||||
/// A `const` item
|
||||
ItemConst(P<Ty>, P<Expr>),
|
||||
/// A function declaration
|
||||
ItemFn(P<FnDecl>, Unsafety, Abi, Generics, P<Block>),
|
||||
/// A module
|
||||
ItemMod(Mod),
|
||||
/// An external module
|
||||
ItemForeignMod(ForeignMod),
|
||||
/// A type alias, e.g. `type Foo = Bar<u8>`
|
||||
ItemTy(P<Ty>, Generics),
|
||||
/// An enum definition, e.g. `enum Foo<A, B> {C<A>, D<B>}`
|
||||
ItemEnum(EnumDef, Generics),
|
||||
/// A struct definition, e.g. `struct Foo<A> {x: A}`
|
||||
ItemStruct(P<StructDef>, Generics),
|
||||
/// Represents a Trait Declaration
|
||||
ItemTrait(Unsafety,
|
||||
@ -1636,8 +1773,9 @@ pub enum Item_ {
|
||||
Vec<P<TraitItem>>),
|
||||
|
||||
// Default trait implementations
|
||||
// `impl Trait for ..`
|
||||
// `impl Trait for .. {}`
|
||||
ItemDefaultImpl(Unsafety, TraitRef),
|
||||
/// An implementation, eg `impl<A> Trait for Foo { .. }`
|
||||
ItemImpl(Unsafety,
|
||||
ImplPolarity,
|
||||
Generics,
|
||||
@ -1679,10 +1817,14 @@ pub struct ForeignItem {
|
||||
pub vis: Visibility,
|
||||
}
|
||||
|
||||
/// An item within an `extern` block
|
||||
#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
|
||||
pub enum ForeignItem_ {
|
||||
/// A foreign function
|
||||
ForeignItemFn(P<FnDecl>, Generics),
|
||||
ForeignItemStatic(P<Ty>, /* is_mutbl */ bool),
|
||||
/// A foreign static item (`static ext: u8`), with optional mutability
|
||||
/// (the boolean is true when mutable)
|
||||
ForeignItemStatic(P<Ty>, bool),
|
||||
}
|
||||
|
||||
impl ForeignItem_ {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user