eval

Documentation

Index

• Constants
• Variables
• type Boolean
  • func NewBooleanObj(b bool) *Boolean
  • func (b *Boolean) Inspect() string
  • func (b *Boolean) Type() ObjectType
• type Error
  • func (e *Error) Inspect() string
  • func (e *Error) Type() ObjectType
• type Nil
  • func NewNil(s string) *Nil
  • func (n *Nil) Inspect() string
  • func (n *Nil) Type() ObjectType
• type Number
  • func NewNumber(f float64) *Number
  • func (n *Number) Inspect() string
  • func (n *Number) Type() ObjectType
• type Object
  • func Eval(node ast.Node, scope *Scope) (val Object)
• type ObjectType
• type Scope
  • func NewScope(p *Scope, w io.Writer) *Scope
  • func (s *Scope) DebugPrint(indent string)
  • func (s *Scope) Del(name string)
  • func (s *Scope) Get(name string) (Object, bool)
  • func (s *Scope) GetKeys() []string
  • func (s *Scope) Set(name string, val Object) Object

Constants

const (
	NUMBER_OBJ  = "NUMBER"
	NIL_OBJ     = "NIL_OBJ"
	BOOLEAN_OBJ = "BOOLEAN"
	ERROR_OBJ   = "ERROR"
)

Variables

var (
	ERR_PREFIXOP     = "unsupported operator for prefix expression:'%s' and type: %s"
	ERR_INFIXOP      = "unsupported operator for infix expression: %s '%s' %s"
	ERR_UNKNOWNIDENT = "unknown identifier: '%s' is not defined"
	ERR_DIVIDEBYZERO = "divide by zero"
)

var (
	TRUE  = &Boolean{Bool: true}
	FALSE = &Boolean{Bool: false}
	NIL   = &Nil{}
)

Types

type Boolean

type Boolean struct {
	Bool bool
}

func NewBooleanObj

func NewBooleanObj(b bool) *Boolean

func (*Boolean) Inspect

func (b *Boolean) Inspect() string

func (*Boolean) Type

func (b *Boolean) Type() ObjectType

type Error

type Error struct {
	Message string
}

func (*Error) Inspect

func (e *Error) Inspect() string

func (*Error) Type

func (e *Error) Type() ObjectType

type Nil

type Nil struct {
}

func NewNil

func NewNil(s string) *Nil

func (*Nil) Inspect

func (n *Nil) Inspect() string

func (*Nil) Type

func (n *Nil) Type() ObjectType

type Number

type Number struct {
	Value float64
}

func NewNumber

func NewNumber(f float64) *Number

func (*Number) Inspect

func (n *Number) Inspect() string

func (*Number) Type

func (n *Number) Type() ObjectType

type Object

type Object interface {
	Type() ObjectType
	Inspect() string
}

func Eval

func Eval(node ast.Node, scope *Scope) (val Object)

type ObjectType

type ObjectType string

object

type Scope

type Scope struct {
	Writer io.Writer
	// contains filtered or unexported fields
}

func NewScope

func NewScope(p *Scope, w io.Writer) *Scope

func (*Scope) DebugPrint

func (s *Scope) DebugPrint(indent string)

func (*Scope) Del

func (s *Scope) Del(name string)

func (*Scope) Get

func (s *Scope) Get(name string) (Object, bool)

func (*Scope) GetKeys

func (s *Scope) GetKeys() []string

Get all the keys of the scope.

func (*Scope) Set

func (s *Scope) Set(name string, val Object) Object