Enum syntax::ast::ExprKind [−][src]
pub enum ExprKind { Box(P<Expr>), ObsoleteInPlace(P<Expr>, P<Expr>), Array(Vec<P<Expr>>), Call(P<Expr>, Vec<P<Expr>>), MethodCall(PathSegment, Vec<P<Expr>>), Tup(Vec<P<Expr>>), Binary(BinOp, P<Expr>, P<Expr>), Unary(UnOp, P<Expr>), Lit(P<Lit>), Cast(P<Expr>, P<Ty>), Type(P<Expr>, P<Ty>), If(P<Expr>, P<Block>, Option<P<Expr>>), IfLet(Vec<P<Pat>>, P<Expr>, P<Block>, Option<P<Expr>>), While(P<Expr>, P<Block>, Option<Label>), WhileLet(Vec<P<Pat>>, P<Expr>, P<Block>, Option<Label>), ForLoop(P<Pat>, P<Expr>, P<Block>, Option<Label>), Loop(P<Block>, Option<Label>), Match(P<Expr>, Vec<Arm>), Closure(CaptureBy, IsAsync, Movability, P<FnDecl>, P<Expr>, Span), Block(P<Block>, Option<Label>), Async(CaptureBy, NodeId, P<Block>), Catch(P<Block>), Assign(P<Expr>, P<Expr>), AssignOp(BinOp, P<Expr>, P<Expr>), Field(P<Expr>, Ident), Index(P<Expr>, P<Expr>), Range(Option<P<Expr>>, Option<P<Expr>>, RangeLimits), Path(Option<QSelf>, Path), AddrOf(Mutability, P<Expr>), Break(Option<Label>, Option<P<Expr>>), Continue(Option<Label>), Ret(Option<P<Expr>>), InlineAsm(P<InlineAsm>), Mac(Mac), Struct(Path, Vec<Field>, Option<P<Expr>>), Repeat(P<Expr>, AnonConst), Paren(P<Expr>), Try(P<Expr>), Yield(Option<P<Expr>>), }
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Variants
Box(P<Expr>)
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A box x
expression.
ObsoleteInPlace(P<Expr>, P<Expr>)
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First expr is the place; second expr is the value.
Array(Vec<P<Expr>>)
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An array ([a, b, c, d]
)
Call(P<Expr>, Vec<P<Expr>>)
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A function call
The first field resolves to the function itself, and the second field is the list of arguments. This also represents calling the constructor of tuple-like ADTs such as tuple structs and enum variants.
MethodCall(PathSegment, Vec<P<Expr>>)
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A method call (x.foo::<'static, Bar, Baz>(a, b, c, d)
)
The PathSegment
represents the method name and its generic arguments
(within the angle brackets).
The first element of the vector of Expr
s is the expression that evaluates
to the object on which the method is being called on (the receiver),
and the remaining elements are the rest of the arguments.
Thus, x.foo::<Bar, Baz>(a, b, c, d)
is represented as
ExprKind::MethodCall(PathSegment { foo, [Bar, Baz] }, [x, a, b, c, d])
.
Tup(Vec<P<Expr>>)
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A tuple ((a, b, c ,d)
)
Binary(BinOp, P<Expr>, P<Expr>)
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A binary operation (For example: a + b
, a * b
)
Unary(UnOp, P<Expr>)
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A unary operation (For example: !x
, *x
)
Lit(P<Lit>)
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A literal (For example: 1
, "foo"
)
Cast(P<Expr>, P<Ty>)
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A cast (foo as f64
)
Type(P<Expr>, P<Ty>)
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If(P<Expr>, P<Block>, Option<P<Expr>>)
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An if
block, with an optional else block
if expr { block } else { expr }
IfLet(Vec<P<Pat>>, P<Expr>, P<Block>, Option<P<Expr>>)
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An if let
expression with an optional else block
if let pat = expr { block } else { expr }
This is desugared to a match
expression.
While(P<Expr>, P<Block>, Option<Label>)
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A while loop, with an optional label
'label: while expr { block }
WhileLet(Vec<P<Pat>>, P<Expr>, P<Block>, Option<Label>)
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A while-let loop, with an optional label
'label: while let pat = expr { block }
This is desugared to a combination of loop
and match
expressions.
ForLoop(P<Pat>, P<Expr>, P<Block>, Option<Label>)
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A for loop, with an optional label
'label: for pat in expr { block }
This is desugared to a combination of loop
and match
expressions.
Loop(P<Block>, Option<Label>)
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Conditionless loop (can be exited with break, continue, or return)
'label: loop { block }
Match(P<Expr>, Vec<Arm>)
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A match
block.
Closure(CaptureBy, IsAsync, Movability, P<FnDecl>, P<Expr>, Span)
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A closure (for example, move |a, b, c| a + b + c
)
The final span is the span of the argument block |...|
Block(P<Block>, Option<Label>)
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A block ('label: { ... }
)
Async(CaptureBy, NodeId, P<Block>)
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An async block (async move { ... }
)
The NodeId
is the NodeId
for the closure that results from
desugaring an async block, just like the NodeId field in the
IsAsync
enum. This is necessary in order to create a def for the
closure which can be used as a parent of any child defs. Defs
created during lowering cannot be made the parent of any other
preexisting defs.
Catch(P<Block>)
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A catch block (catch { ... }
)
Assign(P<Expr>, P<Expr>)
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An assignment (a = foo()
)
AssignOp(BinOp, P<Expr>, P<Expr>)
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An assignment with an operator
For example, a += 1
.
Field(P<Expr>, Ident)
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Access of a named (obj.foo
) or unnamed (obj.0
) struct field
Index(P<Expr>, P<Expr>)
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An indexing operation (foo[2]
)
Range(Option<P<Expr>>, Option<P<Expr>>, RangeLimits)
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A range (1..2
, 1..
, ..2
, 1...2
, 1...
, ...2
)
Path(Option<QSelf>, Path)
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Variable reference, possibly containing ::
and/or type
parameters, e.g. foo::bar::
Optionally "qualified",
E.g. <Vec<T> as SomeTrait>::SomeType
.
AddrOf(Mutability, P<Expr>)
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A referencing operation (&a
or &mut a
)
Break(Option<Label>, Option<P<Expr>>)
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A break
, with an optional label to break, and an optional expression
Continue(Option<Label>)
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A continue
, with an optional label
Ret(Option<P<Expr>>)
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A return
, with an optional value to be returned
InlineAsm(P<InlineAsm>)
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Output of the asm!()
macro
Mac(Mac)
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A macro invocation; pre-expansion
Struct(Path, Vec<Field>, Option<P<Expr>>)
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A struct literal expression.
For example, Foo {x: 1, y: 2}
, or
Foo {x: 1, .. base}
, where base
is the Option<Expr>
.
Repeat(P<Expr>, AnonConst)
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An array literal constructed from one repeated element.
For example, [1; 5]
. The expression is the element to be
repeated; the constant is the number of times to repeat it.
Paren(P<Expr>)
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No-op: used solely so we can pretty-print faithfully
Try(P<Expr>)
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expr?
Yield(Option<P<Expr>>)
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A yield
, with an optional value to be yielded
Trait Implementations
impl Clone for ExprKind
[src]
impl Clone for ExprKind
fn clone(&self) -> ExprKind
[src]
fn clone(&self) -> ExprKind
Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
1.0.0[src]
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source
. Read more
impl Encodable for ExprKind
[src]
impl Encodable for ExprKind
fn encode<__S: Encoder>(&self, s: &mut __S) -> Result<(), __S::Error>
[src]
fn encode<__S: Encoder>(&self, s: &mut __S) -> Result<(), __S::Error>
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impl Decodable for ExprKind
[src]
impl Decodable for ExprKind
fn decode<__D: Decoder>(d: &mut __D) -> Result<ExprKind, __D::Error>
[src]
fn decode<__D: Decoder>(d: &mut __D) -> Result<ExprKind, __D::Error>
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impl Debug for ExprKind
[src]
impl Debug for ExprKind