object

package
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 Go to latest Published: Oct 14, 2020 License: MIT Imports: 6 Imported by: 3

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Constants

View Source 
const (
	BuiltinFuncNameLen   = "len"
	BuiltinFuncNamePrint = "print"

	// Type conversions
	BuiltinFuncNameInt    = "int"
	BuiltinFuncNameFloat  = "float"
	BuiltinFuncNameString = "string"
)
View Source 
const (
	IntegerObj          = "Integer"
	FloatObj            = "Float"
	BooleanObj          = "Boolean"
	NullObj             = "Null"
	ReturnValueObj      = "ReturnValue"
	ErrorObj            = "Error"
	FunctionObj         = "Function"
	StringObj           = "String"
	BuiltinObj          = "Builtin"
	ArrayObj            = "Array"
	HashObj             = "Hash"
	CompiledFunctionObj = "CompiledFunction"
	ClosureObj          = "Closure"
	ScopeObj            = "Scope"
)

Variables

View Source 
var (
	NullValue = NullObject
	True      = &Boolean{Value: true}
	False     = &Boolean{Value: false}
)
View Source 
var Builtins = []struct {
	Name    string
	Builtin *Builtin
}{
	{
		BuiltinFuncNameLen,
		&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 %q not supported, got %s",
					BuiltinFuncNameLen, args[0].Type())
			}
		},
		},
	},
	{
		BuiltinFuncNamePrint,
		&Builtin{Fn: func(args ...Object) Object {
			for _, arg := range args {
				fmt.Println(arg.Inspect())
			}

			return nil
		},
		},
	},
	{
		BuiltinFuncNameInt,
		&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 *Integer:
				return arg
			case *Float:
				return &Integer{Value: int64(arg.Value)}
			case *String:
				val, err := strconv.ParseInt(arg.Value, 10, 64)
				if err != nil {
					return newError("Conversion to int failed!")
				}
				return &Integer{Value: val}
			default:
				return newError("argument to %q not supported, got %s",
					BuiltinFuncNameLen, args[0].Type())
			}
		},
		},
	},
	{
		BuiltinFuncNameFloat,
		&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 *Integer:
				return &Float{Value: float64(arg.Value)}
			case *Float:
				return arg
			case *String:
				val, err := strconv.ParseFloat(arg.Value, 64)
				if err != nil {
					return newError("Conversion to float failed!")
				}
				return &Float{Value: val}
			default:
				return newError("argument to %q not supported, got %s",
					BuiltinFuncNameLen, args[0].Type())
			}
		},
		},
	},
	{
		BuiltinFuncNameString,
		&Builtin{Fn: func(args ...Object) Object {
			if len(args) != 1 {
				return newError("wrong number of arguments. got=%d, want=1",
					len(args))
			}
			return &String{Value: args[0].String()}
		},
		},
	},
}
View Source 
var NullObject = &Null{}

Functions

This section is empty.

Types

type Array 

type Array struct {
	Elements []Object
}

func (*Array) GetMember 

func (obj *Array) GetMember(name string) Object

func (*Array) InfixOperation 

func (obj *Array) InfixOperation(operator string, other Object) Object

func (*Array) Inspect 

func (ao *Array) Inspect() string

func (*Array) String 

func (ao *Array) String() string

func (*Array) Type 

func (ao *Array) Type() ObjectType

type Boolean 

type Boolean struct {
	Value bool
}

func NativeBoolToBooleanObject 

func NativeBoolToBooleanObject(input bool) *Boolean

func (*Boolean) GetMember 

func (obj *Boolean) GetMember(name string) Object

func (*Boolean) HashKey 

func (b *Boolean) HashKey() HashKey

func (*Boolean) InfixOperation 

func (obj *Boolean) InfixOperation(operator string, other Object) Object

func (*Boolean) Inspect 

func (b *Boolean) Inspect() string

func (*Boolean) String 

func (b *Boolean) String() string

func (*Boolean) Type 

func (b *Boolean) Type() ObjectType

type Builtin 

type Builtin struct {
	Fn BuiltinFunction
}

func (*Builtin) GetMember 

func (obj *Builtin) GetMember(name string) Object

func (*Builtin) InfixOperation 

func (obj *Builtin) InfixOperation(operator string, other Object) Object

func (*Builtin) Inspect 

func (b *Builtin) Inspect() string

func (*Builtin) String 

func (b *Builtin) String() 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
	Exports map[string]Object
}

func (*Closure) GetMember 

func (obj *Closure) GetMember(name string) Object

func (*Closure) InfixOperation 

func (obj *Closure) InfixOperation(operator string, other Object) Object

func (*Closure) Inspect 

func (c *Closure) Inspect() string

func (*Closure) String 

func (c *Closure) String() string

func (*Closure) Type 

func (c *Closure) Type() ObjectType

type CompiledFunction 

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

func (*CompiledFunction) GetMember 

func (obj *CompiledFunction) GetMember(name string) Object

func (*CompiledFunction) InfixOperation 

func (obj *CompiledFunction) InfixOperation(operator string, other Object) Object

func (*CompiledFunction) Inspect 

func (cf *CompiledFunction) Inspect() string

func (*CompiledFunction) String 

func (cf *CompiledFunction) String() string

func (*CompiledFunction) Type 

func (cf *CompiledFunction) Type() ObjectType

type Error 

type Error struct {
	Message string
}

func (*Error) GetMember 

func (obj *Error) GetMember(name string) Object

func (*Error) InfixOperation 

func (obj *Error) InfixOperation(operator string, other Object) Object

func (*Error) Inspect 

func (e *Error) Inspect() string

func (*Error) String 

func (e *Error) String() string

func (*Error) Type 

func (e *Error) Type() ObjectType

type Float 

type Float struct {
	Value float64
}

func (*Float) GetMember 

func (obj *Float) GetMember(name string) Object

func (*Float) HashKey 

func (i *Float) HashKey() HashKey

func (*Float) InfixOperation 

func (obj *Float) InfixOperation(operator string, other Object) Object

func (*Float) Inspect 

func (i *Float) Inspect() string

func (*Float) String 

func (i *Float) String() string

func (*Float) Type 

func (i *Float) Type() ObjectType

type Hash 

type Hash struct {
	Pairs map[HashKey]HashPair
}

func (*Hash) GetMember 

func (obj *Hash) GetMember(name string) Object

func (*Hash) InfixOperation 

func (obj *Hash) InfixOperation(operator string, other Object) Object

func (*Hash) Inspect 

func (h *Hash) Inspect() string

func (*Hash) String 

func (h *Hash) String() string

func (*Hash) Type 

func (h *Hash) Type() ObjectType

type HashKey 

type HashKey struct {
	Type  ObjectType
	Value string
}

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) GetMember 

func (obj *Integer) GetMember(name string) Object

func (*Integer) HashKey 

func (i *Integer) HashKey() HashKey

func (*Integer) InfixOperation 

func (obj *Integer) InfixOperation(operator string, other Object) Object

func (*Integer) Inspect 

func (i *Integer) Inspect() string

func (*Integer) String 

func (i *Integer) String() string

func (*Integer) Type 

func (i *Integer) Type() ObjectType

type MemberFn 

type MemberFn struct {
	Obj Object
	Fn  MemberFunction
}

func (*MemberFn) GetMember 

func (obj *MemberFn) GetMember(name string) Object

func (*MemberFn) InfixOperation 

func (obj *MemberFn) InfixOperation(operator string, other Object) Object

func (*MemberFn) Inspect 

func (b *MemberFn) Inspect() string

func (*MemberFn) String 

func (b *MemberFn) String() string

func (*MemberFn) Type 

func (b *MemberFn) Type() ObjectType

type MemberFunction 

type MemberFunction func(this Object, args ...Object) Object

type Null 

type Null struct{}

func (*Null) GetMember 

func (obj *Null) GetMember(name string) Object

func (*Null) InfixOperation 

func (obj *Null) InfixOperation(operator string, other Object) Object

func (*Null) Inspect 

func (n *Null) Inspect() string

func (*Null) String 

func (n *Null) String() string

func (*Null) Type 

func (n *Null) Type() ObjectType

type Object 

type Object interface {
	Type() ObjectType
	Inspect() string
	String() string
	GetMember(name string) Object

	InfixOperation(operator string, other Object) Object
}

type ObjectType 

type ObjectType string

type ReturnValue 

type ReturnValue struct {
	Value Object
}

func (*ReturnValue) GetMember 

func (obj *ReturnValue) GetMember(name string) Object

func (*ReturnValue) InfixOperation 

func (obj *ReturnValue) InfixOperation(operator string, other Object) Object

func (*ReturnValue) Inspect 

func (rv *ReturnValue) Inspect() string

func (*ReturnValue) String 

func (rv *ReturnValue) String() string

func (*ReturnValue) Type 

func (rv *ReturnValue) Type() ObjectType

type Scope 

type Scope struct {
	Name         string
	Constants    []Object
	Instructions code.Instructions
	NumLocals    int
	Exports      map[string]Object
}

func (*Scope) GetMember 

func (obj *Scope) GetMember(name string) Object

func (*Scope) InfixOperation 

func (obj *Scope) InfixOperation(operator string, other Object) Object

func (*Scope) Inspect 

func (cf *Scope) Inspect() string

func (*Scope) String 

func (cf *Scope) String() string

func (*Scope) Type 

func (cf *Scope) Type() ObjectType

type String 

type String struct {
	Value string
}

func (*String) GetMember 

func (obj *String) GetMember(name string) Object

func (*String) HashKey 

func (s *String) HashKey() HashKey

func (*String) InfixOperation 

func (obj *String) InfixOperation(operator string, other Object) Object

func (*String) Inspect 

func (s *String) Inspect() string

func (*String) String 

func (s *String) String() string

func (*String) Type 

func (s *String) Type() ObjectType

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