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// Copyright 2018 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package types
import (
"fmt"
"reflect"
"github.com/google/cel-go/common/types/ref"
"github.com/google/cel-go/common/types/traits"
)
var (
// IteratorType singleton.
IteratorType = NewObjectType("iterator", traits.IteratorType)
)
// baseIterator is the basis for list, map, and object iterators.
//
// An iterator in and of itself should not be a valid value for comparison, but must implement the
// `ref.Val` methods in order to be well-supported within instruction arguments processed by the
// interpreter.
type baseIterator struct{}
func (*baseIterator) ConvertToNative(typeDesc reflect.Type) (any, error) {
return nil, fmt.Errorf("type conversion on iterators not supported")
}
func (*baseIterator) ConvertToType(typeVal ref.Type) ref.Val {
return NewErr("no such overload")
}
func (*baseIterator) Equal(other ref.Val) ref.Val {
return NewErr("no such overload")
}
func (*baseIterator) Type() ref.Type {
return IteratorType
}
func (*baseIterator) Value() any {
return nil
}
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