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// Copyright 2022 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package i18n
import (
"fmt"
"reflect"
)
// Format formats provided arguments for a given translated message
func Format(format string, args ...interface{}) (msg string, err error) {
if len(args) == 0 {
return format, nil
}
fmtArgs := make([]interface{}, 0, len(args))
for _, arg := range args {
val := reflect.ValueOf(arg)
if val.Kind() == reflect.Slice {
// Previously, we would accept Tr(lang, key, a, [b, c], d, [e, f]) as Sprintf(msg, a, b, c, d, e, f)
// but this is an unstable behavior.
//
// So we restrict the accepted arguments to either:
//
// 1. Tr(lang, key, [slice-items]) as Sprintf(msg, items...)
// 2. Tr(lang, key, args...) as Sprintf(msg, args...)
if len(args) == 1 {
for i := 0; i < val.Len(); i++ {
fmtArgs = append(fmtArgs, val.Index(i).Interface())
}
} else {
err = ErrUncertainArguments
break
}
} else {
fmtArgs = append(fmtArgs, arg)
}
}
return fmt.Sprintf(format, fmtArgs...), err
}
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