User:Firespeaker/HFST bug

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In 2011, a bug in how HFST handles words containing spaces was documented and resolved (apparently in r1518?), but it introduced a new bug. This page documents the new [incorrect!] behaviour. It appears to only affect transducers written in lexc.

A bug report has been filed (included is a patch for a test case).

text.lexc

Make sure to include the space in '% ' under Multichar_Symbols.

Multichar_Symbols

% 

LEXICON Root

erke:erke # ;
erke% me:erke% me # ;
medvedev:medvedev # ;

Compiling

  1. $ hfst-lexc test.lexc -o test.hfst
  2. $ hfst-invert test.hfst | hfst-fst2fst -w -o test.hfst.ol

Testing

Some correctly analysed forms

  • $ echo "erke" | hfst-proc test.hfst.ol
^erke/erke$
  • $ echo "erke me" | hfst-proc test.hfst.ol
^erke me/erke me$
  • $ echo "medvedev" | hfst-proc test.hfst.ol
^medvedev/medvedev$

The incorrectly analysed form

  • $ echo "erke medvedev" | hfst-proc test.hfst.ol
^erke medvedev/*erke medvedev$

Expected output

This form is analysed correctly by a transducer identical to the one above except with the "erke me" form removed:

  • $ echo "erke medvedev" | hfst-proc test2.hfst.ol
^erke/erke$ ^medvedev/medvedev$

Another test case

This one is meant to be more familiar to English-speakers :)

Multichar_Symbols

% 

LEXICON Root

word:word #;
word% form:word% form #;
formation:formation #;
  • $ echo "word formation" | hfst-proc test3.hfst.ol
^word formation/*word formation$
  • $ echo "formation word" | hfst-proc test3.hfst.ol
^formation/formation$ ^word/word$


Notes

  • This doesn't seem to affect transducers written in other formats. E.g., the transducer that results from apertium-eng-kaz.eng.dix outputs the following:
    • $ echo "right there" | apertium -d . eng-kaz-morph
    • ^right there/right there<adv>$^./.<sent>$
    • $ echo "right the" | apertium -d . eng-kaz-morph
    • ^right/right<adj>/right<adv>/right<n><sg>$ ^the/the<det><def><sp>$^./.<sent>$
    • $ echo "right therein" | apertium -d . eng-kaz-morph
    • ^right/right<adj>/right<adv>/right<n><sg>$ ^therein/*therein$^./.<sent>$

Other materials