object

type Array ¶

type Array struct {
	Elements []Object
}

func (ao *Array) Inspect() string

func (ao *Array) Type() Type

type Boolean ¶

type Boolean struct {
	Value bool
}

Boolean represents boolean type.

func (b *Boolean) HashKey() HashKey

func (b *Boolean) Inspect() string

func (b *Boolean) Type() Type

type BuildIn ¶

type BuildIn struct {
	Fn BuildInFunction
}

BuildIn represents a wrapper around BuildInFunction that implements Object interface.

func (b *BuildIn) Inspect() string

func (b *BuildIn) Type() Type

type BuildInFunction ¶

type BuildInFunction func(args ...Object) Object

BuildInFunction represents build-in function definition.

type Environment ¶

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

Environment represents a local environment that keeps track of identifiers and their values within a session.

func NewEnclosedEnvironment(outer *Environment) *Environment

func NewEnvironment() *Environment

func (e *Environment) Get(name string) (Object, bool)

func (e *Environment) Set(name string, val Object) Object

type Error ¶

type Error struct {
	Message string
}

Error represents an error object.

func (e *Error) Inspect() string

func (e *Error) Type() Type

type Function ¶

type Function struct {
	Parameters []*ast.Identifier
	Body       *ast.BlockStatement
	Env        *Environment
}

Function represents a function.

func (f *Function) Inspect() string

func (f *Function) Type() Type

type HashKey ¶

type HashKey struct {
	Type  Type
	Value uint64
}

type HashMap ¶

type HashMap struct {
	ObjType Type
	Pairs   map[HashKey]HashPair
}

HashMap represents hash map.

func (h *HashMap) Inspect() string

func (h *HashMap) Type() Type

type HashPair ¶

type HashPair struct {
	Key   Object
	Value Object
}

HashPair represents <key>:<value> pair in the hash.

type Hashable ¶

type Hashable interface {
	HashKey() HashKey
}

Hashable describes an object that can be used as a key in hash map.

type Integer ¶

type Integer struct {
	Value int64
}

Integer represents integer type.

func (i *Integer) HashKey() HashKey

func (i *Integer) Inspect() string

func (i *Integer) Type() Type

type Null ¶

type Null struct{}

Null represents null type.

func (n *Null) Inspect() string

func (n *Null) Type() Type

type Object ¶

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

Object represents an entity being evaluated.

type ReturnValue ¶

type ReturnValue struct {
	Value Object
}

ReturnValue represents return statement value.

func (rv *ReturnValue) Inspect() string

func (rv *ReturnValue) Type() Type

type String ¶

type String struct {
	Value string
}

String represents string type.

func (s *String) HashKey() HashKey

func (s *String) Inspect() string

func (s *String) Type() Type

type Type ¶

type Type string

Type represents object's type.