neoneo-go/pkg/vm/stack/stackitem.go
2019-03-15 22:32:08 +00:00

49 lines
1.5 KiB
Go

package stack
import (
"errors"
)
//Item is an interface which represents object that can be placed on the stack
type Item interface {
Integer() (*Int, error)
Boolean() (*Boolean, error)
ByteArray() (*ByteArray, error)
Array() (*Array, error)
Context() (*Context, error)
}
// Represents an `abstract` stack item
// which will hold default values for stack items
// this is intended to be embedded into types that you will use on the stack
type abstractItem struct{}
// Integer is the default implementation for a stackItem
// Implements Item interface
func (a *abstractItem) Integer() (*Int, error) {
return nil, errors.New("This stack item is not an Integer")
}
// Boolean is the default implementation for a stackItem
// Implements Item interface
func (a *abstractItem) Boolean() (*Boolean, error) {
return nil, errors.New("This stack item is not a Boolean")
}
// ByteArray is the default implementation for a stackItem
// Implements Item interface
func (a *abstractItem) ByteArray() (*ByteArray, error) {
return nil, errors.New("This stack item is not a byte array")
}
// Array is the default implementation for a stackItem
// Implements Item interface
func (a *abstractItem) Array() (*Array, error) {
return nil, errors.New("This stack item is not an array")
}
// Context is the default implementation for a stackItem
// Implements Item interface
func (a *abstractItem) Context() (*Context, error) {
return nil, errors.New("This stack item is not of type context")
}