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# Hfst-ospell library and toy commandline tester
This is a minimal hfst optimized lookup format based spell checker library and
a demonstrational implementation of command line based spell checker. The
library is licenced under Apache licence version 2, other licences can be
obtained from University of Helsinki.
[](https://travis-ci.org/hfst/hfst-ospell)
## Dependencies
- libxml++2
- libarchive
## Debian packages for dependencies
- libxml++2-dev
- libarchive-dev
## Usage
Usage in external programs:
#include <ospell.h>
and compile your project with:
$(pkg-config --cflags hfstospell)
and link with:
$(pkg-config --libs hfstospell)
## Programming examples
The library lives in a namespace called hfst_ospell. Pass (weighted!) Transducer
pointers to the Speller constructor, eg.:
FILE * error_source = fopen(error_filename, "r");
FILE * lexicon_file = fopen(lexicon_filename, "r");
hfst_ospell::Transducer * error;
hfst_ospell::Transducer * lexicon;
try {
error = new hfst_ospell::Transducer(error_source);
lexicon = new hfst_ospell::Transducer(lexicon_file);
} catch (hfst_ospell::TransducerParsingException& e) {
/* problem with transducer file, usually completely
different type of file - there's no magic number
in the header to check for this */
}
hfst_ospell::Speller * speller;
try {
speller = new hfst_ospell::Speller(error, lexicon);
} catch (hfst_ospell::AlphabetTranslationException& e) {
/* problem with translating between the two alphabets */
}
And use the functions:
// returns true if line is found in lexicon
bool hfst_ospell::Speller::check(char * line);
// CorrectionQueue is a priority queue, sorted by weight
hfst_ospell::CorrectionQueue hfst_ospell::Speller::correct(char * line);
to communicate with it. See main.cc for a concrete usage example.
## Command-line tool
Main.cc provides a demo utility with the following help message:
Usage: hfst-ospell [OPTIONS] ERRORSOURCE LEXICON
Run a composition of ERRORSOURCE and LEXICON on standard input and
print corrected output
-h, --help Print this help message
-V, --version Print version information
-v, --verbose Be verbose
-q, --quiet Don't be verbose (default)
-s, --silent Same as quiet
Report bugs to hfst-bugs@ling.helsinki.fi
# Use in real-world applications
The HFST based spellers can be used in real applications with help of
[voikko](http://voikko.sf.net). Voikko in turn can be used with enchant,
libreoffice, and firefox.
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