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converthook.go
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/
converthook.go
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package larker
import (
"errors"
"fmt"
"go.starlark.net/starlark"
"go.starlark.net/starlarkstruct"
)
var ErrStarlarkConversion = errors.New("failed to convert Starlark data type")
func starlarkValueAsInterface(value starlark.Value) (interface{}, error) {
switch v := value.(type) {
case starlark.NoneType:
return nil, nil
case starlark.Bool:
return bool(v), nil
case starlark.Int:
res, _ := v.Int64()
return res, nil
case starlark.Float:
return float64(v), nil
case starlark.String:
return string(v), nil
case *starlark.List:
it := v.Iterate()
defer it.Done()
var listItem starlark.Value
var result []interface{}
for it.Next(&listItem) {
listItemInterfaced, err := starlarkValueAsInterface(listItem)
if err != nil {
return nil, err
}
result = append(result, listItemInterfaced)
}
return result, nil
case *starlark.Dict:
result := map[string]interface{}{}
for _, item := range v.Items() {
key := item[0]
value := item[1]
if _, ok := key.(*starlark.String); !ok {
return nil, fmt.Errorf("%w: all dict keys should be strings", ErrStarlarkConversion)
}
dictValueInterfaced, err := starlarkValueAsInterface(value)
if err != nil {
return nil, err
}
result[key.String()] = dictValueInterfaced
}
return result, nil
default:
return nil, fmt.Errorf("%w: unsupported type %T", ErrStarlarkConversion, value)
}
}
func interfaceAsStarlarkValue(value interface{}) (starlark.Value, error) {
switch v := value.(type) {
case nil:
return starlark.None, nil
case bool:
return starlark.Bool(v), nil
case int:
return starlark.MakeInt(v), nil
case int64:
return starlark.MakeInt64(v), nil
case uint:
return starlark.MakeUint(v), nil
case uint64:
return starlark.MakeUint64(v), nil
case float32:
return tryIntegerOrFloat(float64(v))
case float64:
return tryIntegerOrFloat(v)
case string:
return starlark.String(v), nil
case []interface{}:
result := starlark.NewList([]starlark.Value{})
for _, item := range v {
listValueStarlarked, err := interfaceAsStarlarkValue(item)
if err != nil {
return nil, err
}
if err := result.Append(listValueStarlarked); err != nil {
return nil, fmt.Errorf("%w: %v", ErrStarlarkConversion, err)
}
}
return result, nil
case map[string]interface{}:
result := map[string]starlark.Value{}
for key, value := range v {
mapValueStarlarked, err := interfaceAsStarlarkValue(value)
if err != nil {
return nil, err
}
result[key] = mapValueStarlarked
}
dict := starlarkstruct.FromStringDict(starlarkstruct.Default, result)
return dict, nil
default:
return nil, fmt.Errorf("%w: unsupported type %T", ErrStarlarkConversion, value)
}
}
func tryIntegerOrFloat(floatValue float64) (starlark.Value, error) {
if integerValue := int64(floatValue); floatValue == float64(integerValue) {
return starlark.MakeInt64(integerValue), nil
}
return starlark.Float(floatValue), nil
}