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Snowball 2.2.0 (2021-11-10) =========================== New Code Generators ------------------- * Add Ada generator from Stephane Carrez (#135). Javascript ---------- * Fix generated code to use integer division rather than floating point division. Noted by David Corbett. Pascal ------ * Fix code generated for division. Previously real division was used and the generated code would fail to compile with a "Incompatible types" error. Noted by David Corbett. * Fix code generated for Snowball's `minint` and `maxint` constant. Python ------ * Python 2 is no longer actively supported, as proposed on the mailing list: https://lists.tartarus.org/pipermail/snowball-discuss/2021-August/001721.html * Fix code generated for division. Previously the Python code we generated used integer division but rounded negative fractions towards negative infinity rather than zero under Python 2, and under Python 3 used floating point division. Noted by David Corbett. Code Quality Improvements ------------------------- * C#: An `among` without functions is now generated as `static` and groupings are now generated as constant. Patches from James Turner in #146 and #147. Code generation improvements ---------------------------- * General: + Constant numeric subexpressions and constant numeric tests are now evaluated at Snowball compile time. Behavioural changes to existing algorithms ------------------------------------------ * german2: Fix handling of `qu` to match algorithm description. Previously the implementation erroneously did `skip 2` after `qu`. We suspect this was intended to skip the `qu` but that's already been done by the substring/among matching, so it actually skips an extra two characters. The implementation has always differed in this way, but there's no good reason to skip two extra characters here so overall it seems best to change the code to match the description. This change only affects the stemming of a single word in the sample vocabulary - `quae` which seems to actually be Latin rather than German. Optimisations to existing algorithms ------------------------------------ * arabic: Handle exception cases in the among they're exceptions to. * greek: Remove unused slice setting, handle exception cases in the among they're exceptions to, and turn `substring ... among ... or substring ... among ...` into a single `substring ... among ...` in cases where it is trivial to do so. * hindi: Eliminate the need for variable `p`. * irish: Minor optimisation in setting `pV` and `p1`. * yiddish: Make use of `among` more. Compiler -------- * Fix handling of `len` and `lenof` being declared as names. For compatibility with programs written for older Snowball versions len and lenof stop being tokens if declared as names. However this code didn't work correctly if the tokeniser's name buffer needed to be enlarged to hold the token name (i.e. 3 or 5 elements respectively). * Report a clearer error if `=` is used instead of `==` in an integer test. * Replace a single entry command list with its contents in the internal syntax tree. This puts things in a more canonical form, which helps subsequent optimisations. Build system ------------ * Support building on Microsoft Windows (using mingw+msys or a similar Unix-like environment). Patch from Jannick in #129. * Split out INCLUDES from CPPFLAGS so that CPPFLAGS can now be overridden by the user if required. Fixes #148, reported by Dominique Leuenberger. * Regenerate algorithms.mk only when needed rather than on every `make` run. libstemmer ---------- * The libstemmer static library now has a `.a` extension, rather than `.o`. Patch from Michal Vasilek in #150. Testsuite --------- * stemtest: Test that numbers and numeric codes aren't damaged by any of the algorithms. Regression test for #66. Fixes #81. * ada: Fix ada tests to fail if output differs. There was an extra `| head -300` compared to other languages, which meant that the exit code of `diff` was ignored. It seems more helpful (and is more consistent) not to limit how many differences are shown so just drop this addition. * go: Stop thinning testdata. It looks like we only are because the test harness code was based on that for rust, which was based on that for javascript, which was only thinning because it was reading everything into memory and the larger vocabulary lists were resulting in out of memory issues. * javascript: Speed up stemwords.js. Process input line-by-line rather than reading the whole file into memory, splitting, iterating, and creating an array with all the output, joining and writing out a single huge string. This also means we can stop thinning the test data for javascript, which we were only doing because the huge arabic test data file was causing out of memory errors. Also drop the -p option, which isn't useful here and complicates the code. * rust: Turn on optimisation in the makefile rather than the CI config. This makes the tests run in about 1/5 of the time and there's really no reason to be thinning the testdata for rust. Documentation ------------- * CONTRIBUTING.rst: Improve documentation for adding a new stemming algorithm. * Improve wording of Python docs.
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