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Developing Web Applications with Haskell and Yesod
book

Developing Web Applications with Haskell and Yesod

by Michael Snoyman
April 2012
Intermediate to advanced content levelIntermediate to advanced
294 pages
6h 27m
English
O'Reilly Media, Inc.
Content preview from Developing Web Applications with Haskell and Yesod

Chapter 16. Internationalization

Users expect our software to speak their language. Unfortunately for us, there will likely be more than one language involved. While doing simple string replacement isn’t too involved, correctly dealing with all the grammar issues can be tricky. After all, who wants to see “List 1 file(s)” from a program output?

But a real i18n solution needs to do more than just provide a means of achieving the correct output. It needs to make this process easy for both the programmer and the translator, and be relatively error-proof. Yesod’s answer to the problem gives you:

  • Intelligent guessing of the user’s desired language based on request headers, with the ability to override.

  • A simple syntax for giving translations, which requires no Haskell knowledge. (After all, most translators aren’t programmers.)

  • The ability to bring in the full power of Haskell for tricky grammar issues as necessary, along with a default selection of helper functions to cover most needs.

  • Absolutely no issues at all with word order.

Synopsis

-- @messages/en.msg
Hello: Hello
EnterItemCount: I would like to buy: 
Purchase: Purchase
ItemCount count@Int: You have purchased #{showInt count} #{plural count "item" "items"}.
SwitchLanguage: Switch language to: 
Switch: Switch
-- @messages/he.msg
Hello: שלום
EnterItemCount: אני רוצה לקנות: 
Purchase: קנה
ItemCount count: קנית #{showInt count} #{plural count "דבר" "דברים"}.
SwitchLanguage: החלף שפה ל:
Switch: החלף
-- @i18n-synopsis.hs
{-# LANGUAGE OverloadedStrings, ...
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Publisher Resources

ISBN: 9781449336868Supplemental ContentErrata Page