env

Documentation

Index

• type Environment
  • func New(outer *Environment) *Environment
  • func (e *Environment) Debug() string
  • func (e *Environment) Define(name string, value ast.Expression)
  • func (e *Environment) Get(name string) (value ast.Expression, found bool)
  • func (e *Environment) GetAt(distance int, name string) (value ast.Expression, found bool)
  • func (e *Environment) Set(name string, value ast.Expression) bool
  • func (e *Environment) SetAt(distance int, name string, value ast.Expression) bool

Types

type Environment

type Environment struct {
	Parent *Environment
	// contains filtered or unexported fields
}

func New

func New(outer *Environment) *Environment

func (*Environment) Debug

func (e *Environment) Debug() string

func (*Environment) Define

func (e *Environment) Define(name string, value ast.Expression)

Define sets the value of "name" to "value" within the current scope.

func (*Environment) Get

func (e *Environment) Get(name string) (value ast.Expression, found bool)

Get returns "name"'s value from the closest scope that has "name" defined. "found" is true if a value for "name" was found, or false if no scope in the environment contained a defintion for it.

func (*Environment) GetAt

func (e *Environment) GetAt(distance int, name string) (value ast.Expression, found bool)

func (*Environment) Set

func (e *Environment) Set(name string, value ast.Expression) bool

Set sets the value of the variable "name" to "value" within the closest scope that defines "name". The return value is true if the value was set within that scope, or false if no enclosign scope had the variable defined.

func (*Environment) SetAt

func (e *Environment) SetAt(distance int, name string, value ast.Expression) bool