package pretty

import (

	"reflect"

)

func nonzero(v reflect.Value) bool {

	switch v.Kind() {

	case reflect.Bool:

		return v.Bool()

	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:

		return v.Int() != 0

	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:

		return v.Uint() != 0

	case reflect.Float32, reflect.Float64:

		return v.Float() != 0

	case reflect.Complex64, reflect.Complex128:

		return v.Complex() != complex(0, 0)

	case reflect.String:

		return v.String() != ""

	case reflect.Struct:

		for i := 0; i < v.NumField(); i++ {

			if nonzero(getField(v, i)) {

				return true

			}

		}

		return false

	case reflect.Array:

		for i := 0; i < v.Len(); i++ {

			if nonzero(v.Index(i)) {

				return true

			}

		}

		return false

	case reflect.Map, reflect.Interface, reflect.Slice, reflect.Ptr, reflect.Chan, reflect.Func:

		return !v.IsNil()

	case reflect.UnsafePointer:

		return v.Pointer() != 0

	}

	return true

}