Enum Expr 

pub enum Expr {
    Assignment(AssignmentExpr),
    Binary(BinaryExpr),
    Unary(UnaryExpr),
    Paren(ParenExpr),
    Call(CallExpr),
    Subset(SubsetExpr),
    Subset2(Subset2Expr),
    If(IfExpr),
    For(ForExpr),
    While(WhileExpr),
    Repeat(RepeatExpr),
    Function(FunctionExpr),
    Block(BlockExpr),
    Name(Ident),
    IntLiteral(IntLit),
    FloatLiteral(FloatLit),
    StringLiteral(StringLit),
    ComplexLiteral(ComplexLit),
}

Any R expression: a compound node (BINARY_EXPR, CALL_EXPR, …) or a leaf atom token (a name or a literal).

Variants

Assignment(AssignmentExpr)

Binary(BinaryExpr)

Unary(UnaryExpr)

Paren(ParenExpr)

Call(CallExpr)

Subset(SubsetExpr)

Subset2(Subset2Expr)

If(IfExpr)

For(ForExpr)

While(WhileExpr)

Repeat(RepeatExpr)

Function(FunctionExpr)

Block(BlockExpr)

Name(Ident)

A bare identifier — also covers R’s special constants (TRUE, NA, …); call Ident::constant to distinguish.

IntLiteral(IntLit)

FloatLiteral(FloatLit)

StringLiteral(StringLit)

ComplexLiteral(ComplexLit)

Implementations

impl Expr

pub fn cast(element: SyntaxElement) -> Option<Expr>

Cast a CST element to an expression. A node dispatches on its kind; a token becomes an atom variant (name or literal). Trivia, operators, keywords, and punctuation are not expressions and yield None.

pub fn cast_node(node: SyntaxNode) -> Option<Expr>

Cast a node to a compound expression. None for a non-expression node (e.g. ARG_LIST, ROOT) — a leaf atom is a token, so use Expr::cast when the element may be either.

pub fn syntax(&self) -> SyntaxElement

The underlying CST element (a node for compound expressions, a token for atoms).

pub fn text_range(&self) -> TextRange

The source range of the expression.

pub fn is_atom(&self) -> bool

Whether this is a primary/atomic expression — one that can be prefixed with ! (or dropped) without reparenthesizing. Namely a name, a literal, a call, a parenthesized expression, or an index ([/[[). This is the guard a negating rewrite (x == FALSE → !x) needs to stay correct.

Trait Implementations

impl Clone for Expr

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Expr

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for Expr

impl Hash for Expr

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Expr

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Expr