/
type.go
200 lines (181 loc) · 4.56 KB
/
type.go
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package abi
import (
"reflect"
"regexp"
"strconv"
"strings"
"github.com/vitelabs/go-vite/v2/common/types"
)
// Type enumerator
const (
IntTy byte = iota
UintTy
BoolTy
StringTy
SliceTy
ArrayTy
AddressTy
GidTy
TokenIdTy
FixedBytesTy
BytesTy
)
// Type is the reflection of the supported argument type
type Type struct {
Elem *Type
Kind reflect.Kind
Type reflect.Type
Size int
T byte // Our own type checking
stringKind string // holds the unparsed string for deriving signatures
}
var (
// typeRegex parses the abi sub types
typeRegex = regexp.MustCompile("([a-zA-Z]+)([0-9]+)?")
)
// NewType creates a new reflection type of abi type given in t.
func NewType(t string) (typ Type, err error) {
if t == "uint" || t == "int" {
// this should fail because it means that there's something wrong with
// the abi type (the compiler should always format it to the size...always)
return Type{}, errUnsupportedArgType(t)
}
// check that array brackets are equal if they exist
if strings.Count(t, "[") != strings.Count(t, "]") || strings.Count(t, "[") > 1 {
return Type{}, errUnsupportedArgType(t)
}
typ.stringKind = t
// if there are brackets, get ready to go into slice/array mode and
// recursively create the type
if strings.Count(t, "[") != 0 {
i := strings.LastIndex(t, "[")
// recursively embed the type
embeddedType, err := NewType(t[:i])
if err != nil {
return Type{}, err
}
// grab the last cell and create a type from there
sliced := t[i:]
// grab the slice size with regexp
re := regexp.MustCompile("[0-9]+")
intz := re.FindAllString(sliced, -1)
if len(intz) == 0 {
// is a slice
typ.T = SliceTy
typ.Kind = reflect.Slice
typ.Elem = &embeddedType
typ.Type = reflect.SliceOf(embeddedType.Type)
} else if len(intz) == 1 {
size, err := strconv.Atoi(intz[0])
if err != nil {
return Type{}, errParsingVariableSize(err)
}
if size == 0 {
return Type{}, errInvalidZeroVariableSize
}
// is a array
typ.T = ArrayTy
typ.Kind = reflect.Array
typ.Elem = &embeddedType
typ.Size = size
typ.Type = reflect.ArrayOf(typ.Size, embeddedType.Type)
} else {
return Type{}, errInvalidArrayTypeFormatting
}
return typ, err
}
// parse the type and size of the abi-type.
parsedType := typeRegex.FindAllStringSubmatch(t, -1)[0]
// varSize is the size of the variable
var varSize int
if len(parsedType[2]) > 0 {
var err error
varSize, err = strconv.Atoi(parsedType[2])
if err != nil {
return Type{}, errParsingVariableSize(err)
}
if varSize == 0 {
return Type{}, errInvalidZeroVariableSize
}
}
// varType is the parsed abi type
switch varType := parsedType[1]; varType {
case "int":
typ.Kind, typ.Type = reflectIntKindAndType(false, varSize)
typ.Size = varSize
typ.T = IntTy
case "uint":
typ.Kind, typ.Type = reflectIntKindAndType(true, varSize)
typ.Size = varSize
typ.T = UintTy
case "bool":
typ.Kind = reflect.Bool
typ.T = BoolTy
typ.Type = reflect.TypeOf(bool(false))
case "address":
typ.Kind = reflect.Array
typ.Type = addressT
typ.Size = types.AddressSize
typ.T = AddressTy
case "gid":
typ.Kind = reflect.Array
typ.Type = gidT
typ.Size = types.GidSize
typ.T = GidTy
case "tokenId":
typ.Kind = reflect.Array
typ.Type = tokenIdT
typ.Size = types.TokenTypeIdSize
typ.T = TokenIdTy
case "string":
typ.Kind = reflect.String
typ.Type = reflect.TypeOf("")
typ.T = StringTy
case "bytes":
if varSize == 0 {
typ.T = BytesTy
typ.Kind = reflect.Slice
typ.Type = reflect.SliceOf(reflect.TypeOf(byte(0)))
} else {
typ.T = FixedBytesTy
typ.Kind = reflect.Array
typ.Size = varSize
typ.Type = reflect.ArrayOf(varSize, reflect.TypeOf(byte(0)))
}
default:
return Type{}, errUnsupportedArgType(t)
}
return
}
// String implements Stringer
func (t Type) String() (out string) {
return t.stringKind
}
func (t Type) pack(v reflect.Value) ([]byte, error) {
// dereference pointer first if it's a pointer
v = indirect(v)
if err := typeCheck(t, v); err != nil {
return nil, err
}
if t.T == SliceTy || t.T == ArrayTy {
var packed []byte
for i := 0; i < v.Len(); i++ {
val, err := t.Elem.pack(v.Index(i))
if err != nil {
return nil, err
}
packed = append(packed, val...)
}
if t.T == SliceTy {
return packBytesSlice(packed, v.Len())
} else if t.T == ArrayTy {
return packed, nil
}
}
return packElement(t, v)
}
// requireLengthPrefix returns whether the type requires any sort of length
// prefixing.
func (t Type) requiresLengthPrefix() bool {
return t.T == StringTy || t.T == BytesTy || t.T == SliceTy
}