Enum Expr

pub enum Expr {
    Number(f64),
    Add(Box<Expr>, Box<Expr>),
    Sub(Box<Expr>, Box<Expr>),
    Variable(String),
}

Abstract Syntax Tree (AST) module.

This module defines the data structures used to represent parsed expressions and statements in the interpreter. Represents an expression in the language.

Variants

Number(f64)

A literal number.

Add(Box<Expr>, Box<Expr>)

Addition of two expressions.

Sub(Box<Expr>, Box<Expr>)

Subtraction of two expressions.

Variable(String)

A variable reference.

Trait Implementations

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 StructuralPartialEq for Expr