i18n-light

v0.5.4

Published

2 years ago

Lightweight NodeJS Internationalization Module.

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i18n-light i18n multilingual internationalization middleware

i18n-light

Installation

npm install --save i18n-light

bower install --save i18n-light

Motiviation

My main motivation in developing i18n-light was to create a localization module which enabled a developer to use the same storage (dictionaries) for both Back-end and Front-end code, thus having localized phrases more consistent and organized.

Vocabulary

| Name | Description | |------|-------------| | Dictionary | A JSON file which i18n-light will use for localization. | | Dicionary Contexts | Is the JSON of a locale. This reside within a dictionary and is this Object which i18n-light will be using for localization. | | Dictionary Path | Is the path which i18n-light need to travel through the dictionary context. | | Locale | A name for a dictionary. |

Usage

Structure

  app
  ├── dict/
  |   ├── en.json
  |   └── it.json
  └── server.js

Dictionaries

dict/en.json

{
  "common": {
    "logo": "i18n-light"
  },
  "home": {
    "logout": "Logout",
    "loggedin": "Hello %s",
    "messages": {
      "zero": "No messages",
      "one": "1 message",
      "many": "%s messages"
    }
  }
}

dict/it.json

{
  "home": {
    "logout": "Esci",
    "loggedin": "Ciao %s",
    "messages": {
      "zero": "0 messaggi",
      "one": "1 messaggio",
      "many": "%s messaggi"
    }
  }
}

Basic Example

var i18n = require('i18n-light')

i18n.configure({
  defaultLocale: 'en',
  dir: path.join(__dirname, 'dict'),
  extension: '.json'
})

Express Example

var express = require('express')
  , app = express()
  , i18n = require('i18n-light')

...

i18n.configure({
  dir: path.join(__dirname, 'dict'),
  defaultLocale: 'en',
  fallback: true,
  cache: true,
  extension: 'json',
  refresh: false
})

app.use(i18n.init())

app.get('/', function(req, res) {
  i18n.setLocale('en')
  console.log(i18n.__('common.logo'))          // => 'i18n-light'
  console.log(i18n.__('home.logout'))          // => 'Logout'
  console.log(i18n.__('home.loggedin', 'Tom')) // => 'Hello Tom'
  console.log(i18n.__('home.messages', 2))     // => '2 messages'
})

app.get('/it', function(req, res) {
  i18n.setLocale('it')
  console.log(i18n.__('common.logo'))          // Will fallback to en => 'i18n-light'
  console.log(i18n.__('home.logout'))          // => 'Esci'
  console.log(i18n.__('home.loggedin', 'Tom')) // => 'Ciao Tom'
  console.log(i18n.__('home.messages', 2))     // => '2 messaggi'
})

...

require('http').createServer(app).listen(8080)

Views Example

...
<body>
  <span><%=i18n.__('common.logo')%></span> <!-- i18n-light -->
</body>
...

Options

| Name | Type | Default | Description | |------|------|---------|-------------| | defaultLocale | String | Required | The locale which i18-light will fallback if a dictionary path isn't resolvable in the current dictionary. | | dir | String | N/A | The directory path where the dictionaries will reside. | | context | Object | N/A | Instead of using dir to instruct i18n-light from where to retrieve the dictionaries, you can pass dictionaries directly through the context. Note: i18n-light will only look for this attribute if dir isn't specified. More information below. | | fallback | Boolean | true | Indicates whether i18n-light should fallback to the defaultLocale dictionary context if the path is invalid in the dictionary context of the current locale. | | refresh | Boolean | false | Indicates whether i18n-light should retrieve an update of the dictionary context (true) or keep using what is already cached (false). | | cache | Boolean | true | Indicates whether i18n-light should cache dictionary contexts (true) or not (false). | | extension | String | .js | The extension of the dictionary files. | | resolve | Function | null | Instead of using dir or context you can use this function to code your own resolver for your dictionary files. Note that i18n-light will only use this function if your i18n-light instance is not configured using either context or dir. More info on how to use here|

API

configure(opts)

Method used to configure (initiate) an instance of i18n-light. Take a look at the options section to understand what options it accepts.

...
i18n.configure({
  dir: path.join(__dirname, 'dict'),
  defaultLocale: 'en',
  fallback: true
})
...

init()

Middleware method. This is the method used to integrate i18n-light instance to Express. Take a look at the usage section example to see how this can be easily done. This method makes your i18n-light instance accessible from:

res.i18n
res.locals.i18n - making your instances accessible from your views.

...
app.use(i18n.init())
...

resetLocale([refresh])

Method used to reset the current locale to the default one. It has an optional parameter refresh which when its true i18n-light updates the dictionary context of the default locale.

i18n.configure({
  defaultLocale: 'en'
  ...
})
...
i18n.setLocale('it')  //default locale is now 'it'
...
i18n.resetLocale()  //default locale is now 'en'

setLocale(locale[, refresh])

Method used to change the current locale of your i18n-light instance to locale. It has an optional argument refresh which when its true, i18n-light updates the dictionary context of locale.

i18n.configure({
  defaultLocale: 'en'
  ...
})
...
i18n.setLocale('it')  //default locale is now 'it'

getLocale()

Method used to get the name of the current locale.

i18n.configure({
  defaultLocale: 'en'
  ...
})
...
i18n.getLocale()  // => en
...
i18n.setLocale('it')
...
i18n.getLocale()  // => it

isCached(locale)

Method used to check whether a dictionary context of locale is cached or not.

i18n.configure({
  defaultLocale: 'en'
  ...
})
...
i18n.isCached('en')  // => true
...
i18n.isCached('it')  // => false
...
i18n.setLocale('it')
...
i18n.isCached('it')  // => true

setDefaultLocale(locale)

Method used to change the default locale of your i18n-light instance to locale.

i18n.configure({
  defaultLocale: 'en'
  ...
})
...
i18n.getLocale()              // => en
...
i18n.setDefaultLocale('it')   // => true
...
i18n.getLocale('it')          // => it

refreshContext([locale])

Method used to refresh the dictionary context of locale.

clearCache([refresh])

Method used to clear the cache of your i18n-light instance.

i18n.configure({
  defaultLocale: 'en'
  ...
})
...
i18n.setLocale('it')    // => en
...
i18n.isCached('en')     // => true
i18n.isCached('it')     // => true
...
i18n.clearCache()
...
i18n.isCached('en')     // => false
i18n.isCached('it')     // => false

It has an optional argument refresh which when its true, i18n-light refreshes the dictionary context of the current locale.

i18n.configure({
  defaultLocale: 'en'
  ...
})
...
i18n.setLocale('it')    // => en
...
i18n.isCached('en')     // => true
i18n.isCached('it')     // => true
...
i18n.clearCache(true)
...
i18n.isCached('en')     // => false
i18n.isCached('it')     // => true

__(path[,arg1 [,arg2[,..]]])

Method used by i18n-light to convert path to the localized phrase within the current dictionary context of the current locale (or default locale if path is invalid and fallback === true).

This method makes use of sprintf-js, enabling you to include placeholders in your dictionary phrases (see example).

Note that if path is not resolvable i18n-light will return the path itself.

Dictionary

{
  "home": {
    "login": "Login",
    "welcome": "Welcome %s"
  }
}

Code

...
i18n.__('home.login')           // => 'Login'
i18n.__('home.welcome', 'Tom')  // => 'Welcome Tom'
...

__n(path[,arg1 [,arg2[,..]]], count)

Method used by i18n-light to convert path to a quantitative localized phrase within the current dictionary context of the current locale (or default locale if path is invalid and fallback === true).

This method makes use of sprintf-js, enabling you to include placeholders in your dictionary phrases (see example).

Note that if path is not resolvable i18n-light will return the path itself.

Also note that the last argument (count) is used only by i18n-light and not by sprintf-js.

If count === 0 or is a String it will append .zero to path.

If count === 1 it will append .one to path.

If count > 1 it will append .many to path.

Dictionary

{
  "home": {
    "messages": {
      "zero": "No messages",
      "one": "1 message",
      "many": "%s messages"
    }
  }
}

Code

...
i18n.__n('home.messages', 0)      // => 'No messages'
i18n.__n('home.messages', 1)      // => '1 Message'
i18n.__n('home.messages', 3)      // => 'undefined messages'
i18n.__n('home.messages', 3, 3)   // => '3 messages'
...

Using your own Resolver

As already mentioned in the options section, i18n-light will only use this functionality if it hasn't been configured with dir or context options. When a context of a locale is needed, i18n-light will call this function with the locale name passed as the parameter. This function should then return a dictionary context in the form of a JSON.

i18n.configure({
  defaultLocale: 'en',
  resolve: function(locale){
    $.ajax({
      type: 'GET',
      url: 'dict/' + locale + '.js',
      dataType: 'json',
      success: function(data) {
        return data
      },
      async: false
    });
  }
  ...
})

Browserify

Intead of using the dir option to point to the dictionaries directory, you have the possibility to inject your own dictionary contexts during the configuration of i18n-light instance using context option. As already stated, in order for i18n-light to use the context option, the dir option needs to be omitted.

The following example shows how can this be done using brfs for browserify.

var i18n = require('i18n-light');

i18n.configure({
  defaultLocale: document.documentElement.lang,
  context: { 'en': JSON.parse(require('fs')
                      .readFileSync('en.js', 'utf-8'))
            , 'it': JSON.parse(require('fs')
                      .readFileSync('it.js', 'utf-8'))
            }
})

Published

Vulnerabilities

Links

Maintainers

Keywords

Readme

i18n-light

Installation

Motiviation

Vocabulary

Usage

Structure

Dictionaries

dict/en.json

dict/it.json

Basic Example

Express Example

Views Example

Options

API

configure(opts)

init()

resetLocale([refresh])

setLocale(locale[, refresh])

getLocale()

isCached(locale)

setDefaultLocale(locale)

refreshContext([locale])

clearCache([refresh])

__(path[,arg1 [,arg2[,..]]])

Dictionary

Code

__n(path[,arg1 [,arg2[,..]]], count)

Dictionary

Code

Using your own Resolver

Browserify