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https://github.com/hunspell/hunspell

The most popular spellchecking library.
https://github.com/hunspell/hunspell

natural-language-processing spell-check spell-checker spell-checking-engine spellcheck spellchecker stemming

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The most popular spellchecking library.

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README 

        
# About Hunspell



Hunspell is a free spell checker and morphological analyzer library

and command-line tool, licensed under LGPL/GPL/MPL tri-license.



Hunspell is used by LibreOffice office suite, free browsers, like

Mozilla Firefox and Google Chrome, and other tools and OSes, like

Linux distributions and macOS. It is also a command-line tool for

Linux, Unix-like and other OSes.



It is designed for quick and high quality spell checking and

correcting for languages with word-level writing system,

including languages with rich morphology, complex word compounding

and character encoding.



Hunspell interfaces: Ispell-like terminal interface using Curses

library, Ispell pipe interface, C++/C APIs and shared library, also

with existing language bindings for other programming languages.



Hunspell's code base comes from OpenOffice.org's MySpell library,

developed by Kevin Hendricks (originally a C++ reimplementation of

spell checking and affixation of Geoff Kuenning's International

Ispell from scratch, later extended with eg. n-gram suggestions),

see http://lingucomponent.openoffice.org/MySpell-3.zip, and

its README, CONTRIBUTORS and license.readme (here: license.myspell) files.



Main features of Hunspell library, developed by László Németh:



  - Unicode support

  - Highly customizable suggestions: word-part replacement tables and

    stem-level phonetic and other alternative transcriptions to recognize

    and fix all typical misspellings, don't suggest offensive words etc.

  - Complex morphology: dictionary and affix homonyms; twofold affix

    stripping to handle inflectional and derivational morpheme groups for

    agglutinative languages, like Azeri, Basque, Estonian, Finnish, Hungarian,

    Turkish; 64 thousand affix classes with arbitrary number of affixes;

    conditional affixes, circumfixes, fogemorphemes, zero morphemes,

    virtual dictionary stems, forbidden words to avoid overgeneration etc.

  - Handling complex compounds (for example, for Finno-Ugric, German and

    Indo-Aryan languages): recognizing compounds made of arbitrary

    number of words, handle affixation within compounds etc.

  - Custom dictionaries with affixation

  - Stemming

  - Morphological analysis (in custom item and arrangement style)

  - Morphological generation

  - SPELLML XML API over plain spell() API function for easier integration

    of stemming, morpological generation and custom dictionaries with affixation

  - Language specific algorithms, like special casing of Azeri or Turkish

    dotted i and German sharp s, and special compound rules of Hungarian.



Main features of Hunspell command line tool, developed by László Németh:



  - Reimplementation of quick interactive interface of Geoff Kuenning's Ispell

  - Parsing formats: text, OpenDocument, TeX/LaTeX, HTML/SGML/XML, nroff/troff

  - Custom dictionaries with optional affixation, specified by a model word

  - Multiple dictionary usage (for example hunspell -d en_US,de_DE,de_medical)

  - Various filtering options (bad or good words/lines)

  - Morphological analysis (option -m)

  - Stemming (option -s)



See man hunspell, man 3 hunspell, man 5 hunspell for complete manual.



Translations: Hunspell has been translated into several languages already. If your language is missing or incomplete, please use [Weblate](https://hosted.weblate.org/engage/hunspell/) to help translate Hunspell.





Stanje prijevoda




# Dependencies



Build only dependencies:



    g++ make autoconf automake autopoint libtool



Runtime dependencies:



|               | Mandatory        | Optional         |

|---------------|------------------|------------------|

|libhunspell    |                  |                  |

|hunspell tool  | libiconv gettext | ncurses readline |



# Compiling on GNU/Linux and Unixes



We first need to download the dependencies. On Linux, `gettext` and

`libiconv` are part of the standard library. On other Unixes we

need to manually install them.



For Ubuntu:



    sudo apt install autoconf automake autopoint libtool



Then run the following commands:



    autoreconf -vfi

    ./configure

    make

    sudo make install

    sudo ldconfig



For dictionary development, use the `--with-warnings` option of

configure.



For interactive user interface of Hunspell executable, use the

`--with-ui` option.



Optional developer packages:



  - ncurses (need for --with-ui), eg. libncursesw5 for UTF-8

  - readline (for fancy input line editing, configure parameter:

    --with-readline)



In Ubuntu, the packages are:



    libncurses5-dev libreadline-dev



# Compiling on OSX and macOS



On macOS for compiler always use `clang` and not `g++` because Homebrew

dependencies are build with that.



    brew install autoconf automake libtool gettext

    brew link gettext --force



Then run:



    autoreconf -vfi

    ./configure

    make



# Compiling on Windows



## Compiling with Mingw64 and MSYS2



Download Msys2, update everything and install the following

    packages:



    pacman -S base-devel mingw-w64-x86_64-toolchain mingw-w64-x86_64-libtool



Open Mingw-w64 Win64 prompt and compile the same way as on Linux, see

above.



## Compiling in Cygwin environment



Download and install Cygwin environment for Windows with the following

extra packages:



  - make

  - automake

  - autoconf

  - libtool

  - gcc-g++ development package

  - ncurses, readline (for user interface)

  - iconv (character conversion)



Then compile the same way as on Linux. Cygwin builds depend on

Cygwin1.dll.



# Debugging



It is recommended to install a debug build of the standard library:



    libstdc++6-6-dbg



For debugging we need to create a debug build and then we need to start

`gdb`.



    ./configure CXXFLAGS='-g -O0 -Wall -Wextra'

    make

    ./libtool --mode=execute gdb src/tools/hunspell



You can also pass the `CXXFLAGS` directly to `make` without calling

`./configure`, but we don't recommend this way during long development

sessions.



If you like to develop and debug with an IDE, see documentation at

https://github.com/hunspell/hunspell/wiki/IDE-Setup



# Testing



Testing Hunspell (see tests in tests/ subdirectory):



    make check



or with Valgrind debugger:



    make check

    VALGRIND=[Valgrind_tool] make check



For example:



    make check

    VALGRIND=memcheck make check



# Documentation



features and dictionary format:



    man 5 hunspell

    man hunspell

    hunspell -h



http://hunspell.github.io/



# Usage



After compiling and installing (see INSTALL) you can run the Hunspell

spell checker (compiled with user interface) with a Hunspell or Myspell

dictionary:



    hunspell -d en_US text.txt



or without interface:



    hunspell

    hunspell -d en_GB -l 



Linking with Hunspell static library:



    g++ -lhunspell-1.7 example.cxx

    # or better, use pkg-config

    g++ $(pkg-config --cflags --libs hunspell) example.cxx



# Installing Hunspell (vcpkg)



Alternatively, you can build and install hunspell using [vcpkg](https://github.com/Microsoft/vcpkg/) dependency manager:



    git clone https://github.com/Microsoft/vcpkg.git

    cd vcpkg

    ./bootstrap-vcpkg.sh

    ./vcpkg integrate install

    ./vcpkg install hunspell



The hunspell port in vcpkg is kept up to date by Microsoft team members and community contributors. If the version is out of date, please [create an issue or pull request](https://github.com/Microsoft/vcpkg) on the vcpkg repository.



## Dictionaries



Hunspell (MySpell) dictionaries:



  - https://wiki.documentfoundation.org/Language_support_of_LibreOffice

  - http://cgit.freedesktop.org/libreoffice/dictionaries

  - http://extensions.libreoffice.org

  - https://extensions.openoffice.org

  - https://wiki.openoffice.org/wiki/Dictionaries



Aspell dictionaries (conversion: man 5 hunspell):



  - ftp://ftp.gnu.org/gnu/aspell/dict



László Németh, nemeth at numbertext org