eval

package
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Published: May 11, 2021 License: MIT Imports: 6 Imported by: 0

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Constants

This section is empty.

Variables

This section is empty.

Functions

func Format

func Format(e Expr) string

Format formats an expression as a string. It does not attempt to remove unnecessary parens.

Types

type Env

type Env map[Var]float64

type Expr

type Expr interface {
	// Eval returns the value of this Expr in the environment env.
	Eval(env Env) float64
	// Check reports errors in this Expr and adds its Vars to the set.
	Check(vars map[Var]bool) error
}

An Expr is an arithmetic expression.

func Parse

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

type Var

type Var string

A Var identifies a variable, e.g., x.

func (Var) Check

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

func (Var) Eval

func (v Var) Eval(env Env) float64

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