86 lines
1.5 KiB
Go
86 lines
1.5 KiB
Go
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package form
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import (
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"github.com/pkg/errors"
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)
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type Attrs map[string]any
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type FieldUnmarshaller interface {
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Unmarshal(v string) error
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}
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type ValidationFunc func(f *Field) error
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type Field struct {
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name string
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attrs map[string]any
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validators []ValidationFunc
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}
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func (f *Field) Name() string {
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return f.name
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}
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func (f *Field) Get(key string) (value any, exists bool) {
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value, exists = f.attrs[key]
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return
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}
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func (f *Field) Set(key string, value any) {
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f.attrs[key] = value
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}
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func (f *Field) Del(key string) {
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delete(f.attrs, key)
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}
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func (f *Field) Attrs() map[string]any {
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return f.attrs
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}
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func (f *Field) Validate() error {
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for _, fn := range f.validators {
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if err := fn(f); err != nil {
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return errors.WithStack(err)
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}
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}
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return nil
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}
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func NewField(name string, attrs Attrs, validators ...ValidationFunc) *Field {
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return &Field{
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name: name,
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attrs: attrs,
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validators: validators,
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}
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}
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func FormFieldAttr[T any](f *Form, name string, attr string) (T, error) {
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field := f.Field(name)
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if field == nil {
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return *new(T), errors.WithStack(ErrFieldNotFound)
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}
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value, err := FieldAttr[T](field, attr)
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if err != nil {
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return *new(T), errors.WithStack(err)
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}
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return value, nil
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}
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func FieldAttr[T any](f *Field, name string) (T, error) {
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raw, ok := f.Get(name)
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if !ok {
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return *new(T), errors.WithStack(ErrMissingValue)
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}
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value, ok := raw.(T)
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if !ok {
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return *new(T), errors.WithStack(ErrUnexpectedValue)
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}
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return value, nil
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}
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