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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| package template | ||
|
|
||
| import ( | ||
| "encoding" | ||
| "fmt" | ||
| "strings" | ||
| "text/template" | ||
| ) | ||
|
|
||
| func NewTextMarshaller[T TextMarshallerArgument, PT TextMarshallerArgumentP[T]](plain string) (TextMarshaller[T, PT], error) { | ||
| var buf TextMarshaller[T, PT] | ||
| if err := buf.Set(plain); err != nil { | ||
| return TextMarshaller[T, PT]{}, nil | ||
| } | ||
| return buf, nil | ||
| } | ||
|
|
||
| func MustNewTextMarshaller[T TextMarshallerArgument, PT TextMarshallerArgumentP[T]](plain string) TextMarshaller[T, PT] { | ||
| buf, err := NewTextMarshaller[T, PT](plain) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| return buf | ||
| } | ||
|
|
||
| type TextMarshallerArgument interface { | ||
| encoding.TextMarshaler | ||
| } | ||
|
|
||
| type TextMarshallerArgumentP[T TextMarshallerArgument] interface { | ||
| *T | ||
| encoding.TextUnmarshaler | ||
| } | ||
|
|
||
| type TextMarshaller[T TextMarshallerArgument, PT TextMarshallerArgumentP[T]] struct { | ||
| plain string | ||
| tmpl *template.Template | ||
| } | ||
|
|
||
| func (this TextMarshaller[T, PT]) Render(data any) (T, error) { | ||
| var bufT T | ||
|
|
||
| if tmpl := this.tmpl; tmpl != nil { | ||
| var buf strings.Builder | ||
| if err := tmpl.Execute(&buf, data); err != nil { | ||
| return bufT, err | ||
| } | ||
| plain := buf.String() | ||
| if plain == "<no value>" { | ||
| plain = "" | ||
| } | ||
|
|
||
| var bufTP PT = new(T) | ||
| if err := bufTP.UnmarshalText([]byte(plain)); err != nil { | ||
| return bufT, fmt.Errorf("templated value results in a value that cannot be parsed: %q - %w", buf.String(), err) | ||
| } | ||
| bufT = *bufTP | ||
| } | ||
|
|
||
| return bufT, nil | ||
| } | ||
|
|
||
| func (this TextMarshaller[T, PT]) String() string { | ||
| return this.plain | ||
| } | ||
|
|
||
| func (this TextMarshaller[T, PT]) IsZero() bool { | ||
| return len(this.plain) == 0 | ||
| } | ||
|
|
||
| func (this TextMarshaller[T, PT]) MarshalText() (text []byte, err error) { | ||
| return []byte(this.String()), nil | ||
| } | ||
|
|
||
| func (this *TextMarshaller[T, PT]) UnmarshalText(text []byte) error { | ||
| if len(text) == 0 { | ||
| *this = TextMarshaller[T, PT]{} | ||
| return nil | ||
| } | ||
| tmpl, err := NewTemplate("textMarshaller", string(text)) | ||
| if err != nil { | ||
| return fmt.Errorf("illegal textMarshaller template: %w", err) | ||
| } | ||
| *this = TextMarshaller[T, PT]{ | ||
| plain: string(text), | ||
| tmpl: tmpl, | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (this *TextMarshaller[T, PT]) Set(text string) error { | ||
| return this.UnmarshalText([]byte(text)) | ||
| } | ||
|
|
||
| func (this TextMarshaller[T, PT]) IsEqualTo(other any) bool { | ||
| if other == nil { | ||
| return false | ||
| } | ||
| switch v := other.(type) { | ||
| case TextMarshaller[T, PT]: | ||
| return this.isEqualTo(&v) | ||
| case *TextMarshaller[T, PT]: | ||
| return this.isEqualTo(v) | ||
| default: | ||
| return false | ||
| } | ||
| } | ||
|
|
||
| func (this TextMarshaller[T, PT]) isEqualTo(other *TextMarshaller[T, PT]) bool { | ||
| return this.plain == other.plain | ||
| } |
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