110 lines
2.1 KiB
Go
110 lines
2.1 KiB
Go
package objects
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import (
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"fmt"
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"strings"
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"github.com/d5/tengo/compiler/token"
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)
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// ImmutableArray represents an immutable array of objects.
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type ImmutableArray struct {
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Value []Object
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}
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// TypeName returns the name of the type.
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func (o *ImmutableArray) TypeName() string {
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return "immutable-array"
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}
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func (o *ImmutableArray) String() string {
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var elements []string
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for _, e := range o.Value {
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elements = append(elements, e.String())
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}
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return fmt.Sprintf("[%s]", strings.Join(elements, ", "))
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}
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// BinaryOp returns another object that is the result of
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// a given binary operator and a right-hand side object.
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func (o *ImmutableArray) BinaryOp(op token.Token, rhs Object) (Object, error) {
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if rhs, ok := rhs.(*ImmutableArray); ok {
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switch op {
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case token.Add:
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return &Array{Value: append(o.Value, rhs.Value...)}, nil
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}
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}
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return nil, ErrInvalidOperator
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}
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// Copy returns a copy of the type.
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func (o *ImmutableArray) Copy() Object {
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var c []Object
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for _, elem := range o.Value {
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c = append(c, elem.Copy())
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}
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return &Array{Value: c}
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}
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// IsFalsy returns true if the value of the type is falsy.
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func (o *ImmutableArray) IsFalsy() bool {
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return len(o.Value) == 0
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}
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// Equals returns true if the value of the type
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// is equal to the value of another object.
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func (o *ImmutableArray) Equals(x Object) bool {
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var xVal []Object
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switch x := x.(type) {
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case *Array:
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xVal = x.Value
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case *ImmutableArray:
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xVal = x.Value
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default:
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return false
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}
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if len(o.Value) != len(xVal) {
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return false
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}
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for i, e := range o.Value {
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if !e.Equals(xVal[i]) {
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return false
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}
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}
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return true
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}
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// IndexGet returns an element at a given index.
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func (o *ImmutableArray) IndexGet(index Object) (res Object, err error) {
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intIdx, ok := index.(*Int)
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if !ok {
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err = ErrInvalidIndexType
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return
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}
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idxVal := int(intIdx.Value)
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if idxVal < 0 || idxVal >= len(o.Value) {
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res = UndefinedValue
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return
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}
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res = o.Value[idxVal]
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return
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}
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// Iterate creates an array iterator.
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func (o *ImmutableArray) Iterate() Iterator {
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return &ArrayIterator{
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v: o.Value,
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l: len(o.Value),
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}
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}
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