Update to tengo v2 (#976)

vendor/github.com/d5/tengo/v2/iterator.go

@@ -0,0 +1,209 @@
+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]}
+}