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package objects
import (
"fmt"
"strings"
"github.com/d5/tengo/compiler/token"
)
// ImmutableArray represents an immutable array of objects.
type ImmutableArray struct {
Value []Object
}
// TypeName returns the name of the type.
func (o *ImmutableArray) TypeName() string {
return "immutable-array"
}
func (o *ImmutableArray) String() string {
var elements []string
for _, e := range o.Value {
elements = append(elements, e.String())
}
return fmt.Sprintf("[%s]", strings.Join(elements, ", "))
}
// BinaryOp returns another object that is the result of
// a given binary operator and a right-hand side object.
func (o *ImmutableArray) BinaryOp(op token.Token, rhs Object) (Object, error) {
if rhs, ok := rhs.(*ImmutableArray); ok {
switch op {
case token.Add:
return &Array{Value: append(o.Value, rhs.Value...)}, nil
}
}
return nil, ErrInvalidOperator
}
// Copy returns a copy of the type.
func (o *ImmutableArray) Copy() Object {
var c []Object
for _, elem := range o.Value {
c = append(c, elem.Copy())
}
return &Array{Value: c}
}
// IsFalsy returns true if the value of the type is falsy.
func (o *ImmutableArray) 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 *ImmutableArray) Equals(x Object) bool {
var xVal []Object
switch x := x.(type) {
case *Array:
xVal = x.Value
case *ImmutableArray:
xVal = x.Value
default:
return false
}
if len(o.Value) != len(xVal) {
return false
}
for i, e := range o.Value {
if !e.Equals(xVal[i]) {
return false
}
}
return true
}
// IndexGet returns an element at a given index.
func (o *ImmutableArray) 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 = o.Value[idxVal]
return
}
// Iterate creates an array iterator.
func (o *ImmutableArray) Iterate() Iterator {
return &ArrayIterator{
v: o.Value,
l: len(o.Value),
}
}
|
