eval

Documentation

Index

• Constants
• Variables
• func IsTrue(obj Object) bool
• type Array
  • func (a *Array) Inspect() string
  • func (a *Array) Type() ObjectType
• type Boolean
  • func NewBooleanObj(b bool) *Boolean
  • func (b *Boolean) Inspect() string
  • func (b *Boolean) Type() ObjectType
• type Builtin
  • func (b *Builtin) Inspect() string
  • func (b *Builtin) Type() ObjectType
• type BuiltinFunc
• 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 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 ReturnValue
  • func (rv *ReturnValue) Inspect() string
  • func (rv *ReturnValue) 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
• type String
  • func NewString(s string) *String
  • func (s *String) Inspect() string
  • func (s *String) Type() ObjectType

Constants

const (
	NUMBER_OBJ       = "NUMBER"
	NIL_OBJ          = "NIL_OBJ"
	BOOLEAN_OBJ      = "BOOLEAN"
	STRING_OBJ       = "STRING"
	ERROR_OBJ        = "ERROR"
	RETURN_VALUE_OBJ = "RETURN_VALUE"
	FUNCTION_OBJ     = "FUNCTION"
	BUILTIN_OBJ      = "BUILTIN"
	ARRAY_OBJ        = "ARRAY"
)

Variables

var (
	ERR_ARGUMENT     = "wrong number of arguments. expected=%d, got=%d"
	ERR_INDEX        = "index error: '%d' out of range"
	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"
	ERR_NOTFUNCTION  = "not a function: %s"
	ERR_NOINDEXABLE  = "index error: type %s is not indexable"
)

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

Functions

func IsTrue

func IsTrue(obj Object) bool

Types

type Array

type Array struct {
	Members []Object
}

func (*Array) Inspect

func (a *Array) Inspect() string

func (*Array) Type

func (a *Array) Type() ObjectType

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 Builtin

type Builtin struct {
	Fn BuiltinFunc
}

func (*Builtin) Inspect

func (b *Builtin) Inspect() string

func (*Builtin) Type

func (b *Builtin) Type() ObjectType

type BuiltinFunc

type BuiltinFunc func(line string, scope *Scope, args ...Object) Object

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 {
	Literal *ast.FunctionLiteral
	Scope   *Scope
}

func (*Function) Inspect

func (f *Function) Inspect() string

func (*Function) Type

func (f *Function) 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 ReturnValue

type ReturnValue struct {
	Value Object
}

func (*ReturnValue) Inspect

func (rv *ReturnValue) Inspect() string

func (*ReturnValue) Type

func (rv *ReturnValue) Type() ObjectType

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

type String

type String struct {
	String string
}

func NewString

func NewString(s string) *String

func (*String) Inspect

func (s *String) Inspect() string

func (*String) Type

func (s *String) Type() ObjectType