neoneo-go/pkg/vm/stack_item.go

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package vm
import (
"encoding/json"
"fmt"
"math/big"
"reflect"
)
// A StackItem represents the "real" value that is pushed on the stack.
type StackItem interface {
fmt.Stringer
Value() interface{}
}
func makeStackItem(v interface{}) StackItem {
switch val := v.(type) {
case int:
return &BigIntegerItem{
value: big.NewInt(int64(val)),
}
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case int64:
return &BigIntegerItem{
value: big.NewInt(val),
}
case []byte:
return &ByteArrayItem{
value: val,
}
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case string:
return &ByteArrayItem{
value: []byte(val),
}
case bool:
return &BoolItem{
value: val,
}
case []StackItem:
return &ArrayItem{
value: val,
}
case *big.Int:
return &BigIntegerItem{
value: val,
}
case StackItem:
return val
case []int:
a := []StackItem{}
for _, i := range val {
a = append(a, makeStackItem(i))
}
return makeStackItem(a)
default:
panic(
fmt.Sprintf(
"invalid stack item type: %v (%v)",
val,
reflect.TypeOf(val),
),
)
}
}
// StructItem represents a struct on the stack.
type StructItem struct {
value []StackItem
}
// NewStructItem returns an new StructItem object.
func NewStructItem(items []StackItem) *StructItem {
return &StructItem{
value: items,
}
}
// Value implements StackItem interface.
func (i *StructItem) Value() interface{} {
return i.value
}
func (i *StructItem) String() string {
return "Struct"
}
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// Clone returns a Struct with all Struct fields copied by value.
// Array fields are still copied by reference.
func (i *StructItem) Clone() *StructItem {
ret := &StructItem{make([]StackItem, len(i.value))}
for j := range i.value {
switch t := i.value[j].(type) {
case *StructItem:
ret.value[j] = t.Clone()
default:
ret.value[j] = t
}
}
return ret
}
// BigIntegerItem represents a big integer on the stack.
type BigIntegerItem struct {
value *big.Int
}
// NewBigIntegerItem returns an new BigIntegerItem object.
func NewBigIntegerItem(value int) *BigIntegerItem {
return &BigIntegerItem{
value: big.NewInt(int64(value)),
}
}
// Value implements StackItem interface.
func (i *BigIntegerItem) Value() interface{} {
return i.value
}
func (i *BigIntegerItem) String() string {
return "BigInteger"
}
// MarshalJSON implements the json.Marshaler interface.
func (i *BigIntegerItem) MarshalJSON() ([]byte, error) {
return json.Marshal(i.value)
}
// BoolItem represents a boolean StackItem.
type BoolItem struct {
value bool
}
// NewBoolItem returns an new BoolItem object.
func NewBoolItem(val bool) *BoolItem {
return &BoolItem{
value: val,
}
}
// Value implements StackItem interface.
func (i *BoolItem) Value() interface{} {
return i.value
}
// MarshalJSON implements the json.Marshaler interface.
func (i *BoolItem) MarshalJSON() ([]byte, error) {
return json.Marshal(i.value)
}
func (i *BoolItem) String() string {
return "Bool"
}
// ByteArrayItem represents a byte array on the stack.
type ByteArrayItem struct {
value []byte
}
// NewByteArrayItem returns an new ByteArrayItem object.
func NewByteArrayItem(b []byte) *ByteArrayItem {
return &ByteArrayItem{
value: b,
}
}
// Value implements StackItem interface.
func (i *ByteArrayItem) Value() interface{} {
return i.value
}
// MarshalJSON implements the json.Marshaler interface.
func (i *ByteArrayItem) MarshalJSON() ([]byte, error) {
return json.Marshal(string(i.value))
}
func (i *ByteArrayItem) String() string {
return "ByteArray"
}
// ArrayItem represents a new ArrayItem object.
type ArrayItem struct {
value []StackItem
}
// NewArrayItem returns a new ArrayItem object.
func NewArrayItem(items []StackItem) *ArrayItem {
return &ArrayItem{
value: items,
}
}
// Value implements StackItem interface.
func (i *ArrayItem) Value() interface{} {
return i.value
}
// MarshalJSON implements the json.Marshaler interface.
func (i *ArrayItem) MarshalJSON() ([]byte, error) {
return json.Marshal(i.value)
}
func (i *ArrayItem) String() string {
return "Array"
}
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// MapItem represents Map object.
type MapItem struct {
value map[interface{}]StackItem
}
// NewMapItem returns new MapItem object.
func NewMapItem() *MapItem {
return &MapItem{
value: make(map[interface{}]StackItem),
}
}
// Value implements StackItem interface.
func (i *MapItem) Value() interface{} {
return i.value
}
// MarshalJSON implements the json.Marshaler interface.
func (i *MapItem) String() string {
return "Map"
}
// Has checks if map has specified key.
func (i *MapItem) Has(key StackItem) (ok bool) {
_, ok = i.value[toMapKey(key)]
return
}
// Add adds key-value pair to the map.
func (i *MapItem) Add(key, value StackItem) {
i.value[toMapKey(key)] = value
}
// toMapKey converts StackItem so that it can be used as a map key.
func toMapKey(key StackItem) interface{} {
switch t := key.(type) {
case *BoolItem:
return t.value
case *BigIntegerItem:
return t.value.Int64()
case *ByteArrayItem:
return string(t.value)
default:
panic("wrong key type")
}
}