Enum Expression 

pub enum Expression {
    IntLiteral(i32),
    StringLiteral(String),
    Variable(String),
    BinaryOp {
        op: BinaryOperator,
        left: Box<Expression>,
        right: Box<Expression>,
    },
    FunctionCall {
        function: String,
        arguments: Vec<Expression>,
    },
    Dereference(Box<Expression>),
    UnaryOp {
        op: UnaryOperator,
        operand: Box<Expression>,
    },
    ArrayIndex {
        array: Box<Expression>,
        index: Box<Expression>,
    },
    FieldAccess {
        object: Box<Expression>,
        field: String,
    },
    PointerFieldAccess {
        pointer: Box<Expression>,
        field: String,
    },
    PostIncrement {
        operand: Box<Expression>,
    },
    PreIncrement {
        operand: Box<Expression>,
    },
    PostDecrement {
        operand: Box<Expression>,
    },
    PreDecrement {
        operand: Box<Expression>,
    },
    Sizeof {
        type_name: String,
    },
    Cast {
        target_type: Type,
        expr: Box<Expression>,
    },
    CompoundLiteral {
        literal_type: Type,
        initializers: Vec<Expression>,
    },
}

Represents a C expression.

Variants

IntLiteral(i32)

Integer literal: 42

StringLiteral(String)

String literal: "hello"

Variable(String)

Variable reference: x

BinaryOp

Binary operation: a + b

Fields

op: BinaryOperator

Operator

left: Box<Expression>

Left operand

right: Box<Expression>

Right operand

FunctionCall

Function call: malloc(4)

Fields

function: String

Function name

arguments: Vec<Expression>

Arguments

Dereference(Box<Expression>)

Pointer dereference: *ptr

UnaryOp

Unary operation: -x, !x

Fields

op: UnaryOperator

Operator

operand: Box<Expression>

Operand

ArrayIndex

Array indexing: arr[i]

Fields

array: Box<Expression>

Array expression

index: Box<Expression>

Index expression

FieldAccess

Struct field access: obj.field

Fields

object: Box<Expression>

Object expression

field: String

Field name

PointerFieldAccess

Pointer field access: ptr->field

Fields

pointer: Box<Expression>

Pointer expression

field: String

Field name

PostIncrement

Post-increment expression: ptr++

Fields

operand: Box<Expression>

Operand expression

PreIncrement

Pre-increment expression: ++ptr

Fields

operand: Box<Expression>

Operand expression

PostDecrement

Post-decrement expression: ptr--

Fields

operand: Box<Expression>

Operand expression

PreDecrement

Pre-decrement expression: --ptr

Fields

operand: Box<Expression>

Operand expression

Sizeof

Sizeof expression: sizeof(int) or sizeof(struct Data)

Fields

type_name: String

Type name as a string (e.g., “int”, “struct Data”)

Cast

Cast expression: (int)x or (void*)ptr

C-style cast that converts an expression to a target type. Maps to Rust as operator for safe casts, or transmute for unsafe casts.

Examples

int x = (int)3.14;           // float to int
void* ptr = (void*)buffer;   // pointer cast
long l = (long)small_int;    // widening cast

Fields

target_type: Type

Target type to cast to

expr: Box<Expression>

Expression being cast

CompoundLiteral

Compound literal: (struct Point){10, 20} or (int[]){1, 2, 3}

C99 compound literals create anonymous objects of a specified type. Useful for passing struct values to functions or creating temporary objects.

Examples

struct Point p = (struct Point){10, 20};       // struct compound literal
int* arr = (int[]){1, 2, 3, 4, 5};             // array compound literal
draw((struct Rect){.x=0, .y=0, .w=100, .h=50}); // with designated initializers

Fields

literal_type: Type

Type of the compound literal (struct Point, int[], etc.)

initializers: Vec<Expression>

Initializer expressions (values for struct fields or array elements)

Implementations

impl Expression

pub fn is_string_function_call(&self) -> bool

Check if this expression is a string function call (strlen, strcmp, strcpy, strdup).

pub fn string_function_name(&self) -> Option<&str>

Get the string function name if this is a string function call.

pub fn has_string_literal_argument(&self) -> bool

Check if this expression has a string literal argument.

Trait Implementations

impl Clone for Expression

fn clone(&self) -> Expression

Returns a duplicate 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