wip

webutil/formscanner.go

@@ -0,0 +1,111 @@
+package webutil
+
+import (
+	"errors"
+	"net/url"
+	"strconv"
+)
+
+var ErrUnsupportedType = errors.New("unsupported type")
+
+type FormScanner struct {
+	form url.Values
+	err  error
+}
+
+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
+	}
+
+	switch v := val.(type) {
+	case *bool:
+		*v = s.form.Has(name)
+	case *string:
+		*v = s.form.Get(name)
+	case *int:
+		if i, err := strconv.ParseInt(s.form.Get(name), 10, 64); err != nil {
+			s.err = err
+		} else {
+			*v = int(i)
+		}
+	case *int8:
+		if i, err := strconv.ParseInt(s.form.Get(name), 10, 8); err != nil {
+			s.err = err
+		} else {
+			*v = int8(i)
+		}
+	case *int16:
+		if i, err := strconv.ParseInt(s.form.Get(name), 10, 16); err != nil {
+			s.err = err
+		} else {
+			*v = int16(i)
+		}
+	case *int32:
+		if i, err := strconv.ParseInt(s.form.Get(name), 10, 32); err != nil {
+			s.err = err
+		} else {
+			*v = int32(i)
+		}
+	case *int64:
+		if i, err := strconv.ParseInt(s.form.Get(name), 10, 64); err != nil {
+			s.err = err
+		} else {
+			*v = int64(i)
+		}
+	case *uint:
+		if i, err := strconv.ParseUint(s.form.Get(name), 10, 64); err != nil {
+			s.err = err
+		} else {
+			*v = uint(i)
+		}
+	case *uint8:
+		if i, err := strconv.ParseUint(s.form.Get(name), 10, 8); err != nil {
+			s.err = err
+		} else {
+			*v = uint8(i)
+		}
+	case *uint16:
+		if i, err := strconv.ParseUint(s.form.Get(name), 10, 16); err != nil {
+			s.err = err
+		} else {
+			*v = uint16(i)
+		}
+	case *uint32:
+		if i, err := strconv.ParseUint(s.form.Get(name), 10, 32); err != nil {
+			s.err = err
+		} else {
+			*v = uint32(i)
+		}
+	case *uint64:
+		if i, err := strconv.ParseUint(s.form.Get(name), 10, 64); err != nil {
+			s.err = err
+		} else {
+			*v = uint64(i)
+		}
+	case *float32:
+		if f, err := strconv.ParseFloat(s.form.Get(name), 32); err != nil {
+			s.err = err
+		} else {
+			*v = float32(f)
+		}
+	case *float64:
+		if f, err := strconv.ParseFloat(s.form.Get(name), 64); err != nil {
+			s.err = err
+		} else {
+			*v = float64(f)
+		}
+	default:
+		s.err = ErrUnsupportedType
+	}
+
+	return s
+}
+
+func (s *FormScanner) Error() error {
+	return s.err
+}