69 lines
1.7 KiB
Go
69 lines
1.7 KiB
Go
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// Package locale defines a Locale type that represents a POSIX locale value, as
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// required by desktop-entry-spec.
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package locale
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import "fmt"
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import "strings"
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type localeError string
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func (err localeError) Error () string { return string(err) }
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const (
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// ErrUnexpectedRune indicates an unexpected rune was encountered while
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// parsing a locale string.
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ErrUnexpectedRune = localeError("unexpected rune")
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// ErrLangEmpty indicates that a lang value was not specified.
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ErrLangEmpty = localeError("lang empty")
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)
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// Locale represents a POSIX locale value.
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type Locale struct {
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Lang string
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Country string
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Encoding string
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Modifier string
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}
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// String returns the string representation of the Locale. Unspecified values
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// are left out.
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func (locale Locale) String () string {
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str := locale.Lang
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if locale.Country != "" {
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str = fmt.Sprint(str, "_", locale.Country)
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}
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if locale.Encoding != "" {
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str = fmt.Sprint(str, ".", locale.Encoding)
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}
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if locale.Modifier != "" {
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str = fmt.Sprint(str, "@", locale.Modifier)
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}
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return str
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}
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// Parse parses a formatted locale string and returns the corresponding Locale.
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func Parse (value string) (Locale, error) {
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locale := Locale { }
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value, locale.Modifier, _ = strings.Cut(value, "@")
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value, locale.Encoding, _ = strings.Cut(value, ".")
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value, locale.Country, _ = strings.Cut(value, "_")
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locale.Lang = value
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if hasIllegalRunes(locale.Lang) ||
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hasIllegalRunes(locale.Country) ||
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hasIllegalRunes(locale.Encoding) ||
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hasIllegalRunes(locale.Modifier) {
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return Locale { }, ErrUnexpectedRune
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}
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if locale.Lang == "" {
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return Locale { }, ErrLangEmpty
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}
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return locale, nil
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}
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func hasIllegalRunes (value string) bool {
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return strings.ContainsAny(value, "@._ ")
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}
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