sinProject-Inc/talk

export class LocaleCode {
    public static readonly english_united_states = new LocaleCode('en-US')
    public static readonly japanese_japan = new LocaleCode('ja-JP')

    private readonly _code: string

    public constructor(code: string | undefined) {
        if (!code) throw new Error('LocaleCode is required')
        if (!code.includes('-')) throw new Error('LocaleCode must include a hyphen')

        const [language = '', country = ''] = code.split('-')

        if (!/^[a-z]{2,3}$/.test(language)) {
            throw new Error('Language code must be 2 or 3 lowercase letters')
        }

        if (!/^[A-Z]{2}$/.test(country)) {
            throw new Error('Country code must be 2 uppercase letters')
        }

        this._code = code
    }

    public get code(): string {
        return this._code
    }
}