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package tengo
// Iterator represents an iterator for underlying data type.
type Iterator interface {
Object
// Next returns true if there are more elements to iterate.
Next() bool
// Key returns the key or index value of the current element.
Key() Object
// Value returns the value of the current element.
Value() Object
}
// ArrayIterator is an iterator for an array.
type ArrayIterator struct {
ObjectImpl
v []Object
i int
l int
}
// TypeName returns the name of the type.
func (i *ArrayIterator) TypeName() string {
return "array-iterator"
}
func (i *ArrayIterator) String() string {
return "<array-iterator>"
}
// IsFalsy returns true if the value of the type is falsy.
func (i *ArrayIterator) IsFalsy() bool {
return true
}
// Equals returns true if the value of the type is equal to the value of
// another object.
func (i *ArrayIterator) Equals(Object) bool {
return false
}
// Copy returns a copy of the type.
func (i *ArrayIterator) Copy() Object {
return &ArrayIterator{v: i.v, i: i.i, l: i.l}
}
// Next returns true if there are more elements to iterate.
func (i *ArrayIterator) Next() bool {
i.i++
return i.i <= i.l
}
// Key returns the key or index value of the current element.
func (i *ArrayIterator) Key() Object {
return &Int{Value: int64(i.i - 1)}
}
// Value returns the value of the current element.
func (i *ArrayIterator) Value() Object {
return i.v[i.i-1]
}
// BytesIterator represents an iterator for a string.
type BytesIterator struct {
ObjectImpl
v []byte
i int
l int
}
// TypeName returns the name of the type.
func (i *BytesIterator) TypeName() string {
return "bytes-iterator"
}
func (i *BytesIterator) String() string {
return "<bytes-iterator>"
}
// Equals returns true if the value of the type is equal to the value of
// another object.
func (i *BytesIterator) Equals(Object) bool {
return false
}
// Copy returns a copy of the type.
func (i *BytesIterator) Copy() Object {
return &BytesIterator{v: i.v, i: i.i, l: i.l}
}
// Next returns true if there are more elements to iterate.
func (i *BytesIterator) Next() bool {
i.i++
return i.i <= i.l
}
// Key returns the key or index value of the current element.
func (i *BytesIterator) Key() Object {
return &Int{Value: int64(i.i - 1)}
}
// Value returns the value of the current element.
func (i *BytesIterator) Value() Object {
return &Int{Value: int64(i.v[i.i-1])}
}
// MapIterator represents an iterator for the map.
type MapIterator struct {
ObjectImpl
v map[string]Object
k []string
i int
l int
}
// TypeName returns the name of the type.
func (i *MapIterator) TypeName() string {
return "map-iterator"
}
func (i *MapIterator) String() string {
return "<map-iterator>"
}
// IsFalsy returns true if the value of the type is falsy.
func (i *MapIterator) IsFalsy() bool {
return true
}
// Equals returns true if the value of the type is equal to the value of
// another object.
func (i *MapIterator) Equals(Object) bool {
return false
}
// Copy returns a copy of the type.
func (i *MapIterator) Copy() Object {
return &MapIterator{v: i.v, k: i.k, i: i.i, l: i.l}
}
// Next returns true if there are more elements to iterate.
func (i *MapIterator) Next() bool {
i.i++
return i.i <= i.l
}
// Key returns the key or index value of the current element.
func (i *MapIterator) Key() Object {
k := i.k[i.i-1]
return &String{Value: k}
}
// Value returns the value of the current element.
func (i *MapIterator) Value() Object {
k := i.k[i.i-1]
return i.v[k]
}
// StringIterator represents an iterator for a string.
type StringIterator struct {
ObjectImpl
v []rune
i int
l int
}
// TypeName returns the name of the type.
func (i *StringIterator) TypeName() string {
return "string-iterator"
}
func (i *StringIterator) String() string {
return "<string-iterator>"
}
// IsFalsy returns true if the value of the type is falsy.
func (i *StringIterator) IsFalsy() bool {
return true
}
// Equals returns true if the value of the type is equal to the value of
// another object.
func (i *StringIterator) Equals(Object) bool {
return false
}
// Copy returns a copy of the type.
func (i *StringIterator) Copy() Object {
return &StringIterator{v: i.v, i: i.i, l: i.l}
}
// Next returns true if there are more elements to iterate.
func (i *StringIterator) Next() bool {
i.i++
return i.i <= i.l
}
// Key returns the key or index value of the current element.
func (i *StringIterator) Key() Object {
return &Int{Value: int64(i.i - 1)}
}
// Value returns the value of the current element.
func (i *StringIterator) Value() Object {
return &Char{Value: i.v[i.i-1]}
}
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