expr

package
v0.1.1 Latest Latest
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 Go to latest Published: Jul 5, 2022 License: GPL-3.0 Imports: 5 Imported by: 0

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Functions

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Types

type Env 

type Env map[Var]float64

type Expr 

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

func Parse 

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

Parse parses the input string as an arithmetic expression. 

expr = num                         a literal number, e.g., 3.14159
     | id                          a variable name, e.g., x
     | id '(' expr ',' ... ')'     a function call
     | '-' expr                    a unary operator (+-)
     | expr '+' expr               a binary operator (+-*/)

type Var 

type Var string

func (Var) Check 

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

func (Var) Eval 

func (v Var) Eval(env Env) float64

func (Var) String 

func (v Var) String() string

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