Enum Expr 

pub enum Expr {
    Value(i32),
    Variable(usize, usize),
    Operation(Operator, Box<Expr>, Box<Expr>),
    FuncCall(usize, Vec<Expr>),
    If(Box<Expr>, Box<Expr>, Box<Expr>),
}

The expression tree.

Variants

Value(i32)

The literal value.

Variable(usize, usize)

The variable’s scope depth (specified by expr.circulate), and index (in program.vars).

Operation(Operator, Box<Expr>, Box<Expr>)

The operator, and left side value, and right side value.

FuncCall(usize, Vec<Expr>)

The function index (in program.funcs) and list of arguments (number integrity is already verified.)

If(Box<Expr>, Box<Expr>, Box<Expr>)

The condition, the expression evaluated if condition is true, and false.

Implementations

impl Expr

pub fn circulate(self, depth: usize) -> Self

Circulate the variable’s scope depth recursively.

Trait Implementations

impl Clone for Expr

fn clone(&self) -> Expr

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 PartialEq for Expr

fn eq(&self, other: &Expr) -> 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 Eq for Expr

impl StructuralPartialEq for Expr