ast

Documentation

Overview

Package ast declares the types used to represent syntax trees for mathematical expressions.

Index

• type BinaryExpr
  • func (expr *BinaryExpr) Eval() float64
• type Expr
• type Number
  • func (expr *Number) Eval() float64
• type UnaryExpr
  • func (expr *UnaryExpr) Eval() float64

Types

type BinaryExpr

type BinaryExpr struct {
	Op string
	X  Expr
	Y  Expr
}

BinaryExpr represents a binary expression.

func (*BinaryExpr) Eval

func (expr *BinaryExpr) Eval() float64

Eval calculates the value of a binary expression.

type Expr

type Expr interface {
	Eval() float64
}

Expr represents a node in the syntax tree.

type Number

type Number struct {
	Value float64
}

Number represents a number.

func (*Number) Eval

func (expr *Number) Eval() float64

Eval returns the value of a number.

type UnaryExpr

type UnaryExpr struct {
	Op string
	X  Expr
}

UnaryExpr represents a unary expression.

func (*UnaryExpr) Eval

func (expr *UnaryExpr) Eval() float64

Eval calculates the value of a unary expression.