55 lines
1007 B
Go
55 lines
1007 B
Go
package webutil
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"net/url"
|
|
)
|
|
|
|
var ErrUnsupportedType = errors.New("unsupported type")
|
|
|
|
// FormScanFunc is a custom form scanner that can be used to scan custom
|
|
// types using the form scanner.
|
|
//
|
|
// It returns true if it recognizes the type of val, and an error if scanning
|
|
// fails.
|
|
type FormScanFunc func(name string, val any) (bool, error)
|
|
|
|
type FormScanner struct {
|
|
form url.Values
|
|
err error
|
|
ScanFunc FormScanFunc
|
|
}
|
|
|
|
func NewFormScanner(form url.Values) *FormScanner {
|
|
return &FormScanner{form: form}
|
|
}
|
|
|
|
func (s *FormScanner) Scan(name string, val any) *FormScanner {
|
|
if s.err != nil {
|
|
return s
|
|
}
|
|
|
|
if s.ScanFunc != nil {
|
|
if ok, err := s.ScanFunc(name, val); ok {
|
|
s.err = err
|
|
return s
|
|
}
|
|
}
|
|
|
|
switch v := val.(type) {
|
|
case *bool:
|
|
*v = s.form.Has(name)
|
|
default:
|
|
if err := scan(s.form.Get(name), v); err != nil {
|
|
s.err = fmt.Errorf("Error in field %s: %w", name, err)
|
|
}
|
|
}
|
|
|
|
return s
|
|
}
|
|
|
|
func (s *FormScanner) Error() error {
|
|
return s.err
|
|
}
|