object

Documentation

Index

• Constants
• Variables
• type Array
  • func (ao *Array) Inspect() string
  • func (ao *Array) Type() ObjectType
• type Boolean
  • func (b *Boolean) HashKey() HashKey
  • func (b *Boolean) Inspect() string
  • func (b *Boolean) Type() ObjectType
• type Builtin
  • func GetBuiltinByName(name string) *Builtin
  • func (b *Builtin) Inspect() string
  • func (b *Builtin) Type() ObjectType
• type BuiltinFunction
• type Closure
  • func (cl *Closure) Inspect() string
  • func (cl *Closure) Type() ObjectType
• type CompiledFunction
  • func (cf *CompiledFunction) Inspect() string
  • func (cf *CompiledFunction) Type() ObjectType
• type Environment
  • 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
  • func (e *Error) Inspect() string
  • func (e *Error) Type() ObjectType
• type Function
  • func (f *Function) Inspect() string
  • func (f *Function) Type() ObjectType
• type Hash
  • func (h *Hash) Inspect() string
  • func (h *Hash) Type() ObjectType
• type HashKey
• type HashPair
• type Hashable
• type Integer
  • func (i *Integer) HashKey() HashKey
  • func (i *Integer) Inspect() string
  • func (i *Integer) Type() ObjectType
• type Null
  • func (n *Null) Inspect() string
  • func (n *Null) Type() ObjectType
• type Object
• type ObjectType
• type ReturnValue
  • func (rv *ReturnValue) Inspect() string
  • func (rv *ReturnValue) Type() ObjectType
• type String
  • func (s *String) HashKey() HashKey
  • func (s *String) Inspect() string
  • func (s *String) Type() ObjectType

Constants

const (
	NULL_OBJ  = "NULL"
	ERROR_OBJ = "ERROR"

	INTEGER_OBJ = "INTEGER"
	BOOLEAN_OBJ = "BOOLEAN"
	STRING_OBJ  = "STRING"

	RETURN_VALUE_OBJ = "RETURN_VALUE"

	FUNCTION_OBJ = "FUNCTION"
	BUILTIN_OBJ  = "BUILTIN"

	ARRAY_OBJ = "ARRAY"
	HASH_OBJ  = "HASH"

	COMPILED_FUNCTION_OBJ = "COMPILED_FUNCTION_OBJ"
	CLOSURE_OBJ           = "CLOSURE"
)

Variables

var Builtins = []struct {
	Name    string
	Builtin *Builtin
}{
	{
		"len",
		&Builtin{Fn: func(args ...Object) Object {
			if len(args) != 1 {
				return newError("wrong number of arguments. got=%d, want=1",
					len(args))
			}
			switch arg := args[0].(type) {
			case *Array:
				return &Integer{Value: int64(len(arg.Elements))}
			case *String:
				return &Integer{Value: int64(len(arg.Value))}
			default:
				return newError(
					"argument to `len` not supported, got %s",
					args[0].Type(),
				)
			}
		},
		},
	},
	{
		"puts",
		&Builtin{Fn: func(args ...Object) Object {
			for _, arg := range args {
				fmt.Println(arg.Inspect())
			}

			return nil
		},
		},
	},
	{
		"first",
		&Builtin{Fn: func(args ...Object) Object {
			if len(args) != 1 {
				return newError("wrong number of arguments. got=%d, want=1",
					len(args))
			}
			if args[0].Type() != ARRAY_OBJ {
				return newError("argument to `first` must be ARRAY, got %s",
					args[0].Type())
			}

			arr := args[0].(*Array)
			if len(arr.Elements) > 0 {
				return arr.Elements[0]
			}

			return nil
		},
		},
	},
	{
		"last",
		&Builtin{Fn: func(args ...Object) Object {
			if len(args) != 1 {
				return newError("wrong number of arguments. got=%d, want=1",
					len(args))
			}
			if args[0].Type() != ARRAY_OBJ {
				return newError("argument to `last` must be ARRAY, got %s",
					args[0].Type())
			}

			arr := args[0].(*Array)
			length := len(arr.Elements)
			if length > 0 {
				return arr.Elements[length-1]
			}

			return nil
		},
		},
	},
	{
		"rest",
		&Builtin{Fn: func(args ...Object) Object {
			if len(args) != 1 {
				return newError(
					"wrong number of arguments. got=%d, want=1",
					len(args),
				)
			}
			if args[0].Type() != ARRAY_OBJ {
				return newError(
					"argument to `rest` must be ARRAY, got %s",
					args[0].Type(),
				)
			}

			arr := args[0].(*Array)
			length := len(arr.Elements)
			if length > 0 {
				newElements := make([]Object, length-1)
				copy(newElements, arr.Elements[1:length])
				return &Array{Elements: newElements}
			}

			return nil
		},
		},
	},
	{
		"push",
		&Builtin{Fn: func(args ...Object) Object {
			if len(args) != 2 {
				return newError(
					"wrong number of arguments. got=%d, want=2",
					len(args),
				)
			}
			if args[0].Type() != ARRAY_OBJ {
				return newError(
					"argument to `push` must be ARRAY, got %s",
					args[0].Type(),
				)
			}

			arr := args[0].(*Array)
			length := len(arr.Elements)

			newElements := make([]Object, length+1)
			copy(newElements, arr.Elements)
			newElements[length] = args[1]

			return &Array{Elements: newElements}
		},
		},
	},
}

Types

type Array

type Array struct {
	Elements []Object
}

func (*Array) Inspect

func (ao *Array) Inspect() string

func (*Array) Type

func (ao *Array) Type() ObjectType

type Boolean

type Boolean struct {
	Value bool
}

func (*Boolean) HashKey

func (b *Boolean) HashKey() HashKey

func (*Boolean) Inspect

func (b *Boolean) Inspect() string

func (*Boolean) Type

func (b *Boolean) Type() ObjectType

type Builtin

type Builtin struct {
	Fn BuiltinFunction
}

func GetBuiltinByName

func GetBuiltinByName(name string) *Builtin

func (*Builtin) Inspect

func (b *Builtin) Inspect() string

func (*Builtin) Type

func (b *Builtin) Type() ObjectType

type BuiltinFunction

type BuiltinFunction func(args ...Object) Object

type Closure

type Closure struct {
	Fn   *CompiledFunction
	Free []Object
}

func (*Closure) Inspect

func (cl *Closure) Inspect() string

func (*Closure) Type

func (cl *Closure) Type() ObjectType

type CompiledFunction

type CompiledFunction struct {
	Instructions  code.Instructions
	NumLocals     int
	NumParameters int
}

func (*CompiledFunction) Inspect

func (cf *CompiledFunction) Inspect() string

func (*CompiledFunction) Type

func (cf *CompiledFunction) Type() ObjectType

type Environment

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

func NewEnclosedEnvironment

func NewEnclosedEnvironment(outer *Environment) *Environment

create a a variable/funcion storage that extends the main one

func NewEnvironment

func NewEnvironment() *Environment

func (*Environment) Get

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

get a value what is being kept value of, if exists

func (*Environment) Set

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

add value to Environment to keep track of it

type Error

type Error struct {
	Message string
}

func (*Error) Inspect

func (e *Error) Inspect() string

func (*Error) Type

func (e *Error) Type() ObjectType

type Function

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

func (*Function) Inspect

func (f *Function) Inspect() string

func (*Function) Type

func (f *Function) Type() ObjectType

type Hash

type Hash struct {
	Pairs map[HashKey]HashPair
}

func (*Hash) Inspect

func (h *Hash) Inspect() string

func (*Hash) Type

func (h *Hash) Type() ObjectType

type HashKey

type HashKey struct {
	Type  ObjectType
	Value uint64
}

type HashPair

type HashPair struct {
	Key   Object
	Value Object
}

type Hashable

type Hashable interface {
	HashKey() HashKey
}

type Integer

type Integer struct {
	Value int64
}

func (*Integer) HashKey

func (i *Integer) HashKey() HashKey

func (*Integer) Inspect

func (i *Integer) Inspect() string

func (*Integer) Type

func (i *Integer) Type() ObjectType

type Null

type Null struct{}

func (*Null) Inspect

func (n *Null) Inspect() string

func (*Null) Type

func (n *Null) Type() ObjectType

type Object

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

type ObjectType

type ObjectType string

type ReturnValue

type ReturnValue struct {
	Value Object
}

func (*ReturnValue) Inspect

func (rv *ReturnValue) Inspect() string

func (*ReturnValue) Type

func (rv *ReturnValue) Type() ObjectType

type String

type String struct {
	Value string
}

func (*String) HashKey

func (s *String) HashKey() HashKey

func (*String) Inspect

func (s *String) Inspect() string

func (*String) Type

func (s *String) Type() ObjectType