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package stalecucumber
import "fmt"
import "math/big"
/*
This type is returned whenever a helper cannot convert the result of
Unpickle into the desired type.
*/
type WrongTypeError struct {
Result interface{}
Request string
}
func (wte WrongTypeError) Error() string {
return fmt.Sprintf("Unpickling returned type %T which cannot be converted to %s", wte.Result, wte.Request)
}
func newWrongTypeError(result interface{}, request interface{}) error {
return WrongTypeError{Result: result, Request: fmt.Sprintf("%T", request)}
}
/*
This helper attempts to convert the return value of Unpickle into a string.
If Unpickle returns an error that error is returned immediately.
If the value cannot be converted an error is returned.
*/
func String(v interface{}, err error) (string, error) {
if err != nil {
return "", err
}
vs, ok := v.(string)
if ok {
return vs, nil
}
return "", newWrongTypeError(v, vs)
}
/*
This helper attempts to convert the return value of Unpickle into a int64.
If Unpickle returns an error that error is returned immediately.
If the value cannot be converted an error is returned.
*/
func Int(v interface{}, err error) (int64, error) {
if err != nil {
return 0, err
}
vi, ok := v.(int64)
if ok {
return vi, nil
}
vbi, ok := v.(*big.Int)
if ok {
if vbi.BitLen() <= 63 {
return vbi.Int64(), nil
}
}
return 0, newWrongTypeError(v, vi)
}
/*
This helper attempts to convert the return value of Unpickle into a bool.
If Unpickle returns an error that error is returned immediately.
If the value cannot be converted an error is returned.
*/
func Bool(v interface{}, err error) (bool, error) {
if err != nil {
return false, err
}
vb, ok := v.(bool)
if ok {
return vb, nil
}
return false, newWrongTypeError(v, vb)
}
/*
This helper attempts to convert the return value of Unpickle into a *big.Int.
If Unpickle returns an error that error is returned immediately.
If the value cannot be converted an error is returned.
*/
func Big(v interface{}, err error) (*big.Int, error) {
if err != nil {
return nil, err
}
vb, ok := v.(*big.Int)
if ok {
return vb, nil
}
return nil, newWrongTypeError(v, vb)
}
/*
This helper attempts to convert the return value of Unpickle into a float64.
If Unpickle returns an error that error is returned immediately.
If the value cannot be converted an error is returned.
*/
func Float(v interface{}, err error) (float64, error) {
if err != nil {
return 0.0, err
}
vf, ok := v.(float64)
if ok {
return vf, nil
}
return 0.0, newWrongTypeError(v, vf)
}
/*
This helper attempts to convert the return value of Unpickle into a []interface{}.
If Unpickle returns an error that error is returned immediately.
If the value cannot be converted an error is returned.
*/
func ListOrTuple(v interface{}, err error) ([]interface{}, error) {
if err != nil {
return nil, err
}
vl, ok := v.([]interface{})
if ok {
return vl, nil
}
return nil, newWrongTypeError(v, vl)
}
/*
This helper attempts to convert the return value of Unpickle into a map[interface{}]interface{}.
If Unpickle returns an error that error is returned immediately.
If the value cannot be converted an error is returned.
*/
func Dict(v interface{}, err error) (map[interface{}]interface{}, error) {
if err != nil {
return nil, err
}
vd, ok := v.(map[interface{}]interface{})
if ok {
return vd, nil
}
return nil, newWrongTypeError(v, vd)
}
/*
This helper attempts to convert the return value of Unpickle into a map[interface{}]bool.
If Unpickle returns an error that error is returned immediately.
If the value cannot be converted an error is returned.
*/
func Set(v interface{}, err error) (map[interface{}]bool, error) {
if err != nil {
return nil, err
}
vd, ok := v.(map[interface{}]bool)
if ok {
return vd, nil
}
return nil, newWrongTypeError(v, vd)
}
/*
This helper attempts to convert the return value of Unpickle into a map[string]interface{}.
If Unpickle returns an error that error is returned immediately.
If the value cannot be converted an error is returned.
*/
func DictString(v interface{}, err error) (map[string]interface{}, error) {
var src map[interface{}]interface{}
src, err = Dict(v, err)
if err != nil {
return nil, err
}
return tryDictToDictString(src)
}
func tryDictToDictString(src map[interface{}]interface{}) (map[string]interface{}, error) {
dst := make(map[string]interface{}, len(src))
for k, v := range src {
kstr, ok := k.(string)
if !ok {
return nil, newWrongTypeError(src, dst)
}
dst[kstr] = v
}
return dst, nil
}
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