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// Licensed under the MIT license, see LICENSE file for details.
package quicktest
import (
"fmt"
"reflect"
)
// containerIter provides an interface for iterating over a container
// (map, slice or array).
type containerIter interface {
// next advances to the next item in the container.
next() bool
// key returns the current key as a string.
key() string
// value returns the current value.
value() reflect.Value
}
// newIter returns an iterator over x which must be a map, slice
// or array.
func newIter(x interface{}) (containerIter, error) {
v := reflect.ValueOf(x)
switch v.Kind() {
case reflect.Map:
return newMapIter(v), nil
case reflect.Slice, reflect.Array:
return &sliceIter{
index: -1,
v: v,
}, nil
default:
return nil, fmt.Errorf("map, slice or array required")
}
}
// sliceIter implements containerIter for slices and arrays.
type sliceIter struct {
v reflect.Value
index int
}
func (i *sliceIter) next() bool {
i.index++
return i.index < i.v.Len()
}
func (i *sliceIter) value() reflect.Value {
return i.v.Index(i.index)
}
func (i *sliceIter) key() string {
return fmt.Sprintf("index %d", i.index)
}
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