Enum Expression

pub enum Expression {
    Identifier(Box<Node<Identifier>>),
    Constant(Box<Node<Constant>>),
    StringLiteral(Box<Node<StringLiteral>>),
    GenericSelection(Box<Node<GenericSelection>>),
    Member(Box<Node<MemberExpression>>),
    Call(Box<Node<CallExpression>>),
    CompoundLiteral(Box<Node<CompoundLiteral>>),
    SizeOfTy(Box<Node<SizeOfTy>>),
    SizeOfVal(Box<Node<SizeOfVal>>),
    AlignOf(Box<Node<AlignOf>>),
    UnaryOperator(Box<Node<UnaryOperatorExpression>>),
    Cast(Box<Node<CastExpression>>),
    BinaryOperator(Box<Node<BinaryOperatorExpression>>),
    Conditional(Box<Node<ConditionalExpression>>),
    Comma(Box<Vec<Node<Expression>>>),
    OffsetOf(Box<Node<OffsetOfExpression>>),
    VaArg(Box<Node<VaArgExpression>>),
    Statement(Box<Node<Statement>>),
}

Expressions

(C11 6.5)

Variants

Identifier(Box<Node<Identifier>>)

Identifier

May be a variable, function name or enumerator. The latter is different from the standard, where enumerators are classified as constants.

(C11 6.5.1)

Constant(Box<Node<Constant>>)

Numeric and character constants

Enumerator constants, being valid identifiers, are reprented as Identifier in this enum.

(C11 6.5.1)

StringLiteral(Box<Node<StringLiteral>>)

String literal

(C11 6.5.1)

GenericSelection(Box<Node<GenericSelection>>)

Generic selection

(C11 6.5.1.1)

Member(Box<Node<MemberExpression>>)

Structure and union members

Both direct (.) and indirect (->) access.

(C11 6.5.2)

Call(Box<Node<CallExpression>>)

Function call expression

(C11 6.5.2)

CompoundLiteral(Box<Node<CompoundLiteral>>)

Compound literal

(C11 6.5.2)

SizeOfTy(Box<Node<SizeOfTy>>)

Size of a type

(C11 6.5.3)

SizeOfVal(Box<Node<SizeOfVal>>)

Size of a unary expression

(C11 6.5.3)

AlignOf(Box<Node<AlignOf>>)

Alignment of a type

(C11 6.5.3)

UnaryOperator(Box<Node<UnaryOperatorExpression>>)

Unary operators

This represents both postfix and prefix unary oprators. Postfix expressions that take additional operands are represented by a separate entry in this enum.

(C11 6.5.2, c11 6.5.3)

Cast(Box<Node<CastExpression>>)

Cast expression

(type) expr

(C11 6.5.4)

BinaryOperator(Box<Node<BinaryOperatorExpression>>)

Binary operators

All of C binary operators that can be applied to two expressions.

(C11 6.5.5 – 6.5.16)

Conditional(Box<Node<ConditionalExpression>>)

Conditional operator

(C11 6.5.15)

Comma(Box<Vec<Node<Expression>>>)

Comma operator

(C11 6.5.17)

OffsetOf(Box<Node<OffsetOfExpression>>)

Member offset expression

Result of expansion of offsetof macro.

(C11 7.19 §3).

VaArg(Box<Node<VaArgExpression>>)

Variable argument list access

Result of expansion of va_arg macro.

(C11 7.16.1.1).

Statement(Box<Node<Statement>>)

Statement expression

GNU extension

Trait Implementations

impl Clone for Expression

fn clone(&self) -> Expression

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Expression

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

Formats the value using the given formatter.

impl PartialEq for Expression

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for Expression