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package objects
import (
"bytes"
"github.com/d5/tengo"
"github.com/d5/tengo/compiler/token"
)
// Bytes represents a byte array.
type Bytes struct {
Value []byte
}
func (o *Bytes) String() string {
return string(o.Value)
}
// TypeName returns the name of the type.
func (o *Bytes) TypeName() string {
return "bytes"
}
// BinaryOp returns another object that is the result of
// a given binary operator and a right-hand side object.
func (o *Bytes) BinaryOp(op token.Token, rhs Object) (Object, error) {
switch op {
case token.Add:
switch rhs := rhs.(type) {
case *Bytes:
if len(o.Value)+len(rhs.Value) > tengo.MaxBytesLen {
return nil, ErrBytesLimit
}
return &Bytes{Value: append(o.Value, rhs.Value...)}, nil
}
}
return nil, ErrInvalidOperator
}
// Copy returns a copy of the type.
func (o *Bytes) Copy() Object {
return &Bytes{Value: append([]byte{}, o.Value...)}
}
// IsFalsy returns true if the value of the type is falsy.
func (o *Bytes) IsFalsy() bool {
return len(o.Value) == 0
}
// Equals returns true if the value of the type
// is equal to the value of another object.
func (o *Bytes) Equals(x Object) bool {
t, ok := x.(*Bytes)
if !ok {
return false
}
return bytes.Compare(o.Value, t.Value) == 0
}
// IndexGet returns an element (as Int) at a given index.
func (o *Bytes) IndexGet(index Object) (res Object, err error) {
intIdx, ok := index.(*Int)
if !ok {
err = ErrInvalidIndexType
return
}
idxVal := int(intIdx.Value)
if idxVal < 0 || idxVal >= len(o.Value) {
res = UndefinedValue
return
}
res = &Int{Value: int64(o.Value[idxVal])}
return
}
// Iterate creates a bytes iterator.
func (o *Bytes) Iterate() Iterator {
return &BytesIterator{
v: o.Value,
l: len(o.Value),
}
}
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