eval

package

v0.0.0-...-5948a14 Latest Latest Go to latest Published: Jul 26, 2020 License: CC0-1.0 Imports: 6 Imported by: 0

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func Format(e Expr) string

Format an expression as a string

type Env map[Var]float64

Env represents an variable environment map

type Expr interface {
	Eval(env Env) float64
	Check(vars map[Var]bool) error
	String() string
}

Expr is an arithmetic expression

func Parse(input string) (_ Expr, err error)

Parse expressions and evaluate them

type Var string

Var identifies a variable, e.g x, y

func (v Var) Check(vars map[Var]bool) error

Check whether a var is correct

func (v Var) Eval(env Env) float64

Eval statifies the Expr interface for Var

func (v Var) String() string