sjansen/messageformat

package compiler

import (
    "strings"

    "golang.org/x/text/language"
)

type Message struct {
    lang  language.Tag
    parts []part
}

type part interface {
    format(*strings.Builder, language.Tag, map[string]interface{}) error
}

func (m *Message) Format(arguments map[string]interface{}) (string, error) {
    var b strings.Builder
    if err := m.format(&b, m.lang, arguments); err != nil {
        return "", err
    }
    return b.String(), nil
}

func (m *Message) format(b *strings.Builder, lang language.Tag, arguments map[string]interface{}) error {
    for _, part := range m.parts {
        if err := part.format(b, lang, arguments); err != nil {
            return err
        }
    }
    return nil
}