stackitem

package
v0.90.1-pre Latest Latest
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 Go to latest Published: Jul 14, 2020 License: MIT Imports: 15 Imported by: 54

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Constants

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const MaxAllowedInteger = 2<<53 - 1

MaxAllowedInteger is the maximum integer allowed to be encoded.

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const MaxArraySize = 1024

MaxArraySize is the maximum array size allowed in the VM.

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const MaxBigIntegerSizeBits = 32 * 8

MaxBigIntegerSizeBits is the maximum size of BigInt item in bits.

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const MaxSize = 1024 * 1024

MaxSize is the maximum item size allowed in the VM.

Variables

This section is empty.

Functions

func EncodeBinaryStackItem 

func EncodeBinaryStackItem(item Item, w *io.BinWriter)

EncodeBinaryStackItem encodes given Item into the given BinWriter. It's similar to io.Serializable's EncodeBinary, but works with Item interface.

func IsValidMapKey 

func IsValidMapKey(key Item) bool

IsValidMapKey checks whether it's possible to use given Item as a Map key.

func SerializeItem 

func SerializeItem(item Item) ([]byte, error)

SerializeItem encodes given Item into the byte slice.

func ToJSON 

func ToJSON(item Item) ([]byte, error)

ToJSON encodes Item to JSON. It behaves as following: 

ByteArray -> base64 string
BigInteger -> number
Bool -> bool
Null -> null
Array, Struct -> array
Map -> map with keys as UTF-8 bytes

Types

type Array 

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

Array represents a new Array object.

func NewArray 

func NewArray(items []Item) *Array

NewArray returns a new Array object.

func (*Array) Append 

func (i *Array) Append(item Item)

Append adds Item at the end of Array value.

func (*Array) Bool 

func (i *Array) Bool() bool

Bool implements Item interface.

func (*Array) Clear 

func (i *Array) Clear()

Clear removes all elements from Array item value.

func (*Array) Convert 

func (i *Array) Convert(typ Type) (Item, error)

Convert implements Item interface.

func (*Array) Dup 

func (i *Array) Dup() Item

Dup implements Item interface.

func (*Array) Equals 

func (i *Array) Equals(s Item) bool

Equals implements Item interface.

func (*Array) Len 

func (i *Array) Len() int

Len returns length of Array value.

func (*Array) MarshalJSON 

func (i *Array) MarshalJSON() ([]byte, error)

MarshalJSON implements the json.Marshaler interface.

func (*Array) Remove 

func (i *Array) Remove(pos int)

Remove removes element at `pos` index from Array value. It will panics on bad index.

func (*Array) String 

func (i *Array) String() string

func (*Array) TryBytes 

func (i *Array) TryBytes() ([]byte, error)

TryBytes implements Item interface.

func (*Array) TryInteger 

func (i *Array) TryInteger() (*big.Int, error)

TryInteger implements Item interface.

func (*Array) Type 

func (i *Array) Type() Type

Type implements Item interface.

func (*Array) Value 

func (i *Array) Value() interface{}

Value implements Item interface.

type BigInteger 

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

BigInteger represents a big integer on the stack.

func NewBigInteger 

func NewBigInteger(value *big.Int) *BigInteger

NewBigInteger returns an new BigInteger object.

func (*BigInteger) Bool 

func (i *BigInteger) Bool() bool

Bool implements Item interface.

func (*BigInteger) Bytes 

func (i *BigInteger) Bytes() []byte

Bytes converts i to a slice of bytes.

func (*BigInteger) Convert 

func (i *BigInteger) Convert(typ Type) (Item, error)

Convert implements Item interface.

func (*BigInteger) Dup 

func (i *BigInteger) Dup() Item

Dup implements Item interface.

func (*BigInteger) Equals 

func (i *BigInteger) Equals(s Item) bool

Equals implements Item interface.

func (*BigInteger) MarshalJSON 

func (i *BigInteger) MarshalJSON() ([]byte, error)

MarshalJSON implements the json.Marshaler interface.

func (*BigInteger) String 

func (i *BigInteger) String() string

func (*BigInteger) TryBytes 

func (i *BigInteger) TryBytes() ([]byte, error)

TryBytes implements Item interface.

func (*BigInteger) TryInteger 

func (i *BigInteger) TryInteger() (*big.Int, error)

TryInteger implements Item interface.

func (*BigInteger) Type 

func (i *BigInteger) Type() Type

Type implements Item interface.

func (*BigInteger) Value 

func (i *BigInteger) Value() interface{}

Value implements Item interface.

type Bool 

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

Bool represents a boolean Item.

func NewBool 

func NewBool(val bool) *Bool

NewBool returns an new Bool object.

func (*Bool) Bool 

func (i *Bool) Bool() bool

Bool implements Item interface.

func (*Bool) Bytes 

func (i *Bool) Bytes() []byte

Bytes converts Bool to bytes.

func (*Bool) Convert 

func (i *Bool) Convert(typ Type) (Item, error)

Convert implements Item interface.

func (*Bool) Dup 

func (i *Bool) Dup() Item

Dup implements Item interface.

func (*Bool) Equals 

func (i *Bool) Equals(s Item) bool

Equals implements Item interface.

func (*Bool) MarshalJSON 

func (i *Bool) MarshalJSON() ([]byte, error)

MarshalJSON implements the json.Marshaler interface.

func (*Bool) String 

func (i *Bool) String() string

func (*Bool) TryBytes 

func (i *Bool) TryBytes() ([]byte, error)

TryBytes implements Item interface.

func (*Bool) TryInteger 

func (i *Bool) TryInteger() (*big.Int, error)

TryInteger implements Item interface.

func (*Bool) Type 

func (i *Bool) Type() Type

Type implements Item interface.

func (*Bool) Value 

func (i *Bool) Value() interface{}

Value implements Item interface.

type Buffer 

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

Buffer represents represents Buffer stack item.

func NewBuffer 

func NewBuffer(b []byte) *Buffer

NewBuffer returns a new Buffer object.

func (*Buffer) Bool 

func (i *Buffer) Bool() bool

Bool implements Item interface.

func (*Buffer) Convert 

func (i *Buffer) Convert(typ Type) (Item, error)

Convert implements Item interface.

func (*Buffer) Dup 

func (i *Buffer) Dup() Item

Dup implements Item interface.

func (*Buffer) Equals 

func (i *Buffer) Equals(s Item) bool

Equals implements Item interface.

func (*Buffer) Len 

func (i *Buffer) Len() int

Len returns length of Buffer value.

func (*Buffer) MarshalJSON 

func (i *Buffer) MarshalJSON() ([]byte, error)

MarshalJSON implements the json.Marshaler interface.

func (*Buffer) String 

func (i *Buffer) String() string

String implements fmt.Stringer interface.

func (*Buffer) TryBytes 

func (i *Buffer) TryBytes() ([]byte, error)

TryBytes implements Item interface.

func (*Buffer) TryInteger 

func (i *Buffer) TryInteger() (*big.Int, error)

TryInteger implements Item interface.

func (*Buffer) Type 

func (i *Buffer) Type() Type

Type implements Item interface.

func (*Buffer) Value 

func (i *Buffer) Value() interface{}

Value implements Item interface.

type ByteArray 

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

ByteArray represents a byte array on the stack.

func NewByteArray 

func NewByteArray(b []byte) *ByteArray

NewByteArray returns an new ByteArray object.

func (*ByteArray) Bool 

func (i *ByteArray) Bool() bool

Bool implements Item interface.

func (*ByteArray) Convert 

func (i *ByteArray) Convert(typ Type) (Item, error)

Convert implements Item interface.

func (*ByteArray) Dup 

func (i *ByteArray) Dup() Item

Dup implements Item interface.

func (*ByteArray) Equals 

func (i *ByteArray) Equals(s Item) bool

Equals implements Item interface.

func (*ByteArray) MarshalJSON 

func (i *ByteArray) MarshalJSON() ([]byte, error)

MarshalJSON implements the json.Marshaler interface.

func (*ByteArray) String 

func (i *ByteArray) String() string

func (*ByteArray) TryBytes 

func (i *ByteArray) TryBytes() ([]byte, error)

TryBytes implements Item interface.

func (*ByteArray) TryInteger 

func (i *ByteArray) TryInteger() (*big.Int, error)

TryInteger implements Item interface.

func (*ByteArray) Type 

func (i *ByteArray) Type() Type

Type implements Item interface.

func (*ByteArray) Value 

func (i *ByteArray) Value() interface{}

Value implements Item interface.

type Interop 

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

Interop represents interop data on the stack.

func NewInterop 

func NewInterop(value interface{}) *Interop

NewInterop returns new Interop object.

func (*Interop) Bool 

func (i *Interop) Bool() bool

Bool implements Item interface.

func (*Interop) Convert 

func (i *Interop) Convert(typ Type) (Item, error)

Convert implements Item interface.

func (*Interop) Dup 

func (i *Interop) Dup() Item

Dup implements Item interface.

func (*Interop) Equals 

func (i *Interop) Equals(s Item) bool

Equals implements Item interface.

func (*Interop) MarshalJSON 

func (i *Interop) MarshalJSON() ([]byte, error)

MarshalJSON implements the json.Marshaler interface.

func (*Interop) String 

func (i *Interop) String() string

String implements stringer interface.

func (*Interop) TryBytes 

func (i *Interop) TryBytes() ([]byte, error)

TryBytes implements Item interface.

func (*Interop) TryInteger 

func (i *Interop) TryInteger() (*big.Int, error)

TryInteger implements Item interface.

func (*Interop) Type 

func (i *Interop) Type() Type

Type implements Item interface.

func (*Interop) Value 

func (i *Interop) Value() interface{}

Value implements Item interface.

type Item 

type Item interface {
	fmt.Stringer
	Value() interface{}
	// Dup duplicates current Item.
	Dup() Item
	// Bool converts Item to a boolean value.
	Bool() bool
	// TryBytes converts Item to a byte slice.
	TryBytes() ([]byte, error)
	// TryInteger converts Item to an integer.
	TryInteger() (*big.Int, error)
	// Equals checks if 2 StackItems are equal.
	Equals(s Item) bool
	// Type returns stack item type.
	Type() Type
	// Convert converts Item to another type.
	Convert(Type) (Item, error)
}

Item represents the "real" value that is pushed on the stack.

func DecodeBinaryStackItem 

func DecodeBinaryStackItem(r *io.BinReader) Item

DecodeBinaryStackItem decodes previously serialized Item from the given reader. It's similar to the io.Serializable's DecodeBinary(), but implemented as a function because Item itself is an interface. Caveat: always check reader's error value before using the returned Item.

func DeserializeItem 

func DeserializeItem(data []byte) (Item, error)

DeserializeItem decodes Item from the given byte slice.

func FromJSON 

func FromJSON(data []byte) (Item, error)

FromJSON decodes Item from JSON. It behaves as following: 

string -> ByteArray from base64
number -> BigInteger
bool -> Bool
null -> Null
array -> Array
map -> Map, keys are UTF-8

func Make 

func Make(v interface{}) Item

Make tries to make appropriate stack item from provided value. It will panic if it's not possible.

type Map 

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

Map represents Map object. It's ordered, so we use slice representation which should be fine for maps with less than 32 or so elements. Given that our VM has quite low limit of overall stack items, it should be good enough, but it can be extended with a real map for fast random access in the future if need be.

func NewMap 

func NewMap() *Map

NewMap returns new Map object.

func NewMapWithValue 

func NewMapWithValue(value []MapElement) *Map

NewMapWithValue returns new Map object filled with specified value.

func (*Map) Add 

func (i *Map) Add(key, value Item)

Add adds key-value pair to the map.

func (*Map) Bool 

func (i *Map) Bool() bool

Bool implements Item interface.

func (*Map) Clear 

func (i *Map) Clear()

Clear removes all elements from Map item value.

func (*Map) Convert 

func (i *Map) Convert(typ Type) (Item, error)

Convert implements Item interface.

func (*Map) Drop 

func (i *Map) Drop(index int)

Drop removes given index from the map (no bounds check done here).

func (*Map) Dup 

func (i *Map) Dup() Item

Dup implements Item interface.

func (*Map) Equals 

func (i *Map) Equals(s Item) bool

Equals implements Item interface.

func (*Map) Has 

func (i *Map) Has(key Item) bool

Has checks if map has specified key.

func (*Map) Index 

func (i *Map) Index(key Item) int

Index returns an index of the key in map.

func (*Map) Len 

func (i *Map) Len() int

Len returns length of Map value.

func (*Map) String 

func (i *Map) String() string

func (*Map) TryBytes 

func (i *Map) TryBytes() ([]byte, error)

TryBytes implements Item interface.

func (*Map) TryInteger 

func (i *Map) TryInteger() (*big.Int, error)

TryInteger implements Item interface.

func (*Map) Type 

func (i *Map) Type() Type

Type implements Item interface.

func (*Map) Value 

func (i *Map) Value() interface{}

Value implements Item interface.

type MapElement 

type MapElement struct {
	Key   Item
	Value Item
}

MapElement is a key-value pair of StackItems.

type Null 

type Null struct{}

Null represents null on the stack.

func (Null) Bool 

func (i Null) Bool() bool

Bool implements Item interface.

func (Null) Convert 

func (i Null) Convert(typ Type) (Item, error)

Convert implements Item interface.

func (Null) Dup 

func (i Null) Dup() Item

Dup implements Item interface. There is no need to perform a real copy here, as Null has no internal state.

func (Null) Equals 

func (i Null) Equals(s Item) bool

Equals implements Item interface.

func (Null) String 

func (i Null) String() string

String implements Item interface.

func (Null) TryBytes 

func (i Null) TryBytes() ([]byte, error)

TryBytes implements Item interface.

func (Null) TryInteger 

func (i Null) TryInteger() (*big.Int, error)

TryInteger implements Item interface.

func (Null) Type 

func (i Null) Type() Type

Type implements Item interface.

func (Null) Value 

func (i Null) Value() interface{}

Value implements Item interface.

type Pointer 

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

Pointer represents VM-level instruction pointer.

func NewPointer 

func NewPointer(pos int, script []byte) *Pointer

NewPointer returns new pointer on the specified position.

func (*Pointer) Bool 

func (p *Pointer) Bool() bool

Bool implements Item interface.

func (*Pointer) Convert 

func (p *Pointer) Convert(typ Type) (Item, error)

Convert implements Item interface.

func (*Pointer) Dup 

func (p *Pointer) Dup() Item

Dup implements Item interface.

func (*Pointer) Equals 

func (p *Pointer) Equals(s Item) bool

Equals implements Item interface.

func (*Pointer) Position 

func (p *Pointer) Position() int

Position returns pointer item position

func (*Pointer) ScriptHash 

func (p *Pointer) ScriptHash() util.Uint160

ScriptHash returns pointer item hash

func (*Pointer) String 

func (p *Pointer) String() string

String implements Item interface.

func (*Pointer) TryBytes 

func (p *Pointer) TryBytes() ([]byte, error)

TryBytes implements Item interface.

func (*Pointer) TryInteger 

func (p *Pointer) TryInteger() (*big.Int, error)

TryInteger implements Item interface.

func (*Pointer) Type 

func (p *Pointer) Type() Type

Type implements Item interface.

func (*Pointer) Value 

func (p *Pointer) Value() interface{}

Value implements Item interface.

type Struct 

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

Struct represents a struct on the stack.

func NewStruct 

func NewStruct(items []Item) *Struct

NewStruct returns an new Struct object.

func (*Struct) Append 

func (i *Struct) Append(item Item)

Append adds Item at the end of Struct value.

func (*Struct) Bool 

func (i *Struct) Bool() bool

Bool implements Item interface.

func (*Struct) Clear 

func (i *Struct) Clear()

Clear removes all elements from Struct item value.

func (*Struct) Clone 

func (i *Struct) Clone() *Struct

Clone returns a Struct with all Struct fields copied by value. Array fields are still copied by reference.

func (*Struct) Convert 

func (i *Struct) Convert(typ Type) (Item, error)

Convert implements Item interface.

func (*Struct) Dup 

func (i *Struct) Dup() Item

Dup implements Item interface.

func (*Struct) Equals 

func (i *Struct) Equals(s Item) bool

Equals implements Item interface.

func (*Struct) Len 

func (i *Struct) Len() int

Len returns length of Struct value.

func (*Struct) Remove 

func (i *Struct) Remove(pos int)

Remove removes element at `pos` index from Struct value. It will panics on bad index.

func (*Struct) String 

func (i *Struct) String() string

String implements Item interface.

func (*Struct) TryBytes 

func (i *Struct) TryBytes() ([]byte, error)

TryBytes implements Item interface.

func (*Struct) TryInteger 

func (i *Struct) TryInteger() (*big.Int, error)

TryInteger implements Item interface.

func (*Struct) Type 

func (i *Struct) Type() Type

Type implements Item interface.

func (*Struct) Value 

func (i *Struct) Value() interface{}

Value implements Item interface.

type Type 

type Type byte

Type represents type of the stack item. 

const (
	AnyT       Type = 0x00
	PointerT   Type = 0x10
	BooleanT   Type = 0x20
	IntegerT   Type = 0x21
	ByteArrayT Type = 0x28
	BufferT    Type = 0x30
	ArrayT     Type = 0x40
	StructT    Type = 0x41
	MapT       Type = 0x48
	InteropT   Type = 0x60
)

This block defines all known stack item types.

func (Type) IsValid 

func (t Type) IsValid() bool

IsValid checks if s is a well defined stack item type.

func (Type) String 

func (t Type) String() string

String implements fmt.Stringer interface.

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