I18n Functions

Load translations from external JSON files at application startup. This is typically done in app.sl to make translations available globally.

JSON File Format

{
    "app": {
        "title": "My Application",
        "welcome": "Welcome!"
    },
    "nav": {
        "home": "Home",
        "about": "About"
    },
    "common": {
        "save": "Save",
        "cancel": "Cancel"
    }
}

Helper Functions

Create a helper to load translations from JSON files. This flattens nested JSON into dot-notation keys.

let i18n_translations = {}

def flatten_dict(dict, prefix) -> Hash
    let result = {}
    for (pair in entries(dict))
        let key = pair[0]
        let value = pair[1]
        let full_key = prefix + "." + key
        if type(value) == "Hash"
            let nested = flatten_dict(value, full_key)
            for (np in entries(nested))
                result[np[0]] = np[1]
            end
        else
            result[full_key] = value
        end
    end
    return result
end

def i18n_load_translations(locale, dict)
    let flat = flatten_dict(dict, locale)
    for (pair in entries(flat))
        i18n_translations[pair[0]] = pair[1]
    end
end

Loading in app.sl

Load all translation files at application startup. They'll be available globally.

# Load translation files from locales/ directory
let en_data = json_parse(slurp("locales/en.json"))
let fr_data = json_parse(slurp("locales/fr.json"))
let de_data = json_parse(slurp("locales/de.json"))

i18n_load_translations("en", en_data)
i18n_load_translations("fr", fr_data)
i18n_load_translations("de", de_data)

# Set default locale
I18n.set_locale("en")

# Define routes
http_server_get("/", "home#index")
http_server_listen(3000)