Enum endbasic_core::ast::Expr

pub enum Expr {
    Boolean(bool),
    Double(f64),
    Integer(i32),
    Symbol(VarRef),
    Text(String),
    Add(Box<Expr>, Box<Expr>),
    Subtract(Box<Expr>, Box<Expr>),
    Multiply(Box<Expr>, Box<Expr>),
    Divide(Box<Expr>, Box<Expr>),
    Modulo(Box<Expr>, Box<Expr>),
    Negate(Box<Expr>),
    Equal(Box<Expr>, Box<Expr>),
    NotEqual(Box<Expr>, Box<Expr>),
    Less(Box<Expr>, Box<Expr>),
    LessEqual(Box<Expr>, Box<Expr>),
    Greater(Box<Expr>, Box<Expr>),
    GreaterEqual(Box<Expr>, Box<Expr>),
    And(Box<Expr>, Box<Expr>),
    Not(Box<Expr>),
    Or(Box<Expr>, Box<Expr>),
    Xor(Box<Expr>, Box<Expr>),
    Call(VarRef, Vec<Expr>),
}

Represents an expression and provides mechanisms to evaluate it.

Variants

Boolean(bool)

A literal boolean value.

Double(f64)

A literal double-precision floating point value.

Integer(i32)

A literal integer value.

Symbol(VarRef)

A reference to a variable.

Text(String)

A literal string value.

Add(Box<Expr>, Box<Expr>)

Arithmetic addition of two expressions.

Subtract(Box<Expr>, Box<Expr>)

Arithmetic subtraction of two expressions.

Multiply(Box<Expr>, Box<Expr>)

Arithmetic multiplication of two expressions.

Divide(Box<Expr>, Box<Expr>)

Arithmetic division of two expressions.

Modulo(Box<Expr>, Box<Expr>)

Arithmetic modulo operation of two expressions.

Negate(Box<Expr>)

Arithmetic sign flip of an expression.

Equal(Box<Expr>, Box<Expr>)

Relational equality comparison of two expressions.

NotEqual(Box<Expr>, Box<Expr>)

Relational inequality comparison of two expressions.

Less(Box<Expr>, Box<Expr>)

Relational less-than comparison of two expressions.

LessEqual(Box<Expr>, Box<Expr>)

Relational less-than or equal-to comparison of two expressions.

Greater(Box<Expr>, Box<Expr>)

Relational greater-than comparison of two expressions.

GreaterEqual(Box<Expr>, Box<Expr>)

Relational greater-than or equal-to comparison of two expressions.

And(Box<Expr>, Box<Expr>)

Logical and of two expressions.

Not(Box<Expr>)

Logical not of an expression.

Or(Box<Expr>, Box<Expr>)

Logical or of two expressions.

Xor(Box<Expr>, Box<Expr>)

Logical xor of two expressions.

Call(VarRef, Vec<Expr>)

A function call or an array reference.

Implementations

impl Expr

pub fn eval(&self, syms: &mut Symbols) -> Result<Value>

Evaluates the expression to a value.

Symbols are resolved by querying syms. Errors in the computation are returned via the special Value::Bad type.

Trait Implementations

impl Clone for Expr

fn clone(&self) -> Expr

Returns a copy 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<Expr> for Expr

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

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=.

impl StructuralPartialEq for Expr