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lttoolbox

lttoolbox contains finite state tools for lexical processing, morphological analysis and generation of words. Analysis is the process of splitting a word like cats into its lemma cat and the grammatical information <n><pl>. Generation is the opposite process.

The three main programs are lt-comp, the compiler, lt-proc, the processor, and lt-expand, which generates all possible mappings between surface forms and lexical forms in the dictionary.

Executables built by this package:

  • lt-comp: compiler, execute without parameters to show usage instructions.

  • lt-proc: processor, typical options are -a (lexical analyser, default option), -g (lexical generator) and -p (lexical post-generator). Using -h will show all flags.

  • lt-expand: generates all the pairs of transductions of a given dictionary. Execute without parameters to show the instructions of use.

  • lt-trim: trims a compiled analyser to only contain entries which would pass through a compiled bidix, creating a new compiled and trimmed analyser.

  • lt-compose: composes two compiled transducers (applying output of the first to input of the second), with support for flipping labels and allowing incomplete matches.

  • lt-print: prints the arcs of a transducer in ATT format.

  • lt-append: merges two compiled dictionaries.

  • lt-paradigm: extracts all paths from a compiled dictionary matching an input pattern.

  • lsx-comp: an alias of lt-comp.

There is also a C++ API that you can link to (see how apertium or apertium-lex-tools do this).

See https://wiki.apertium.org/wiki/Lttoolbox for usage examples and more information.

Installation

There are binaries available for Debian, Ubuntu, Fedora, CentOS, OpenSUSE, Windows, and macOS. We package both nightly builds and releases. See https://wiki.apertium.org/wiki/Installation for more information. Only build from source if you either want to change this tool's behavior, or are on a platform we don't yet package for.

Requirements:

  • A C++ compiler capable of C++17
  • CMake >= 3.12
  • libxml2 >= 2.6.17
  • ICU
  • utfcpp

Building & installing:

  • ./cmake.sh
  • make
  • make install