Sonnet

Sonnet is a useful framework provided by KDE for software developers who want to solve the problem of spellchecking in text editors. It has a plugin based architecture with support for HSpell, Enchant, ASpell and HUNSPELL plugins. It even supports automated language detection, based on a combination of different algorithms.

Spellchecking in your QTextEdit

Sonnet can be easily integrated into your QTextEdit as follows:

Sonnet::SpellCheckDecorator can also be extended in various ways to spell check text that is formatted differently, for example in emails.

So, you can use MailSpellCheckDecorator in exactly the same way as you would use SpellCheckDecorator, but with the added functionality that MailSpellCheckDecorator will ignore quoted parts of a email.

Language Detection in Sonnet

Sonnet can determine the difference between ~75 languages for a given string. It is based off a perl script originally written by Maciej Ceglowski called Languid. His script used a two-part heuristic to determine language. First the text is checked for the scripts it contains, next for each set of languages using those scripts a n-gram frequency model of a given language is compared to a model of the text. The most similar language model is assumed to be the language. If no language is found an empty string is returned.

Here you see a simple example of language detection using the GuessLanguage class from Sonnet:

GuessLanguage languageGuesser;
QString lang = languageGuesser.identify("Mon super texte");

GUI Widgets provided by Sonnet

Sonnet also provides some GUI widgets that can be used by Qt applications to configure settings in Sonnet; for example Qt applications can use the DictionaryComboBox class from Sonnet to get a QComboBox that can configure the dictionary used by Sonnet.

The ConfigDialog class from Sonnet provides a more advanced configuration dialog to configure settings such as whitelisting words, skipping run-together words as well as enabling or disabling auto detection of the language.