test/tc_porter2_parts.rb

   1 # coding: utf-8
   2 # Porter 2 stemmer test file
   3 #
   4 # This file tests each stage of the stemmer individually.
   5
   6 $:.unshift File.join(File.dirname(__FILE__), "..", "lib")
   7
   8 require 'test/unit'
   9 require 'porter2'
  10
  11 class TestPorter2 < Test::Unit::TestCase
  12
  13   def test_tidy
  14     assert_equal "abacde", "abacde".porter2_tidy
  15     assert_equal "abacde", "  abacde  ".porter2_tidy
  16     assert_equal "abacde", "ABACDE".porter2_tidy
  17     assert_equal "ab'cde", "ab‘cde".porter2_tidy
  18     assert_equal "ab'cde", "ab’cde".porter2_tidy
  19     assert_equal "ab'c'de", "ab’c’de".porter2_tidy
  20     assert_equal "ab'c'de", "ab‘c‘de".porter2_tidy
  21     assert_equal "''abacde", "’‘abacde".porter2_tidy
  22   end
  23
  24   def test_preprocess
  25     assert_equal "abacde", "abacde".porter2_preprocess
  26     assert_equal "abacde", "''abacde".porter2_preprocess
  27     assert_equal "ab'c'de", "'ab'c'de".porter2_preprocess
  28     assert_equal "ab'c'de", "''ab'c'de".porter2_preprocess
  29     assert_equal "Yabac", "yabac".porter2_preprocess
  30     assert_equal "aYbc", "aybc".porter2_preprocess
  31     assert_equal "abacdeY", "abacdey".porter2_preprocess
  32     assert_equal "abaYde", "abayde".porter2_preprocess
  33     assert_equal "kabaYde", "kabayde".porter2_preprocess
  34     assert_equal "kabyaYde", "kabyayde".porter2_preprocess
  35     assert_equal "'", "'''".porter2_preprocess
  36   end
  37
  38   def test_R1
  39     assert_equal "iful",  "beautiful".porter2_r1
  40     assert_equal "y", "beauty".porter2_r1
  41     assert_equal "", "beau".porter2_r1
  42     assert_equal "imadversion", "animadversion".porter2_r1
  43     assert_equal "kled", "sprinkled".porter2_r1
  44     assert_equal "harist", "eucharist".porter2_r1
  45
  46     # special cases
  47     assert_equal "ate", "generate".porter2_r1
  48     assert_equal "ates", "generates".porter2_r1
  49     assert_equal "ated", "generated".porter2_r1
  50     assert_equal "al", "general".porter2_r1
  51     assert_equal "ally", "generally".porter2_r1
  52     assert_equal "ic", "generic".porter2_r1
  53     assert_equal "ically", "generically".porter2_r1
  54     assert_equal "ous", "generous".porter2_r1
  55     assert_equal "ously", "generously".porter2_r1
  56
  57     assert_equal "al", "communal".porter2_r1
  58     assert_equal "ity", "community".porter2_r1
  59     assert_equal "e", "commune".porter2_r1
  60
  61     assert_equal "ic", "arsenic".porter2_r1
  62     assert_equal "al", "arsenal".porter2_r1
  63   end
  64
  65   def test_R2
  66     assert_equal "ul",  "beautiful".porter2_r2
  67     assert_equal "", "beauty".porter2_r2
  68     assert_equal "", "beau".porter2_r2
  69     assert_equal "adversion", "animadversion".porter2_r2
  70     assert_equal "", "sprinkled".porter2_r2
  71     assert_equal "ist", "eucharist".porter2_r2
  72   end
  73
  74   def test_ends_with_short_syllable?
  75     assert_equal true, "rap".porter2_ends_with_short_syllable?
  76     assert_equal true, "trap".porter2_ends_with_short_syllable?
  77     assert_equal true, "entrap".porter2_ends_with_short_syllable?
  78     assert_equal true, "ow".porter2_ends_with_short_syllable?
  79     assert_equal true, "on".porter2_ends_with_short_syllable?
  80     assert_equal true, "at".porter2_ends_with_short_syllable?
  81     assert_equal false, "uproot".porter2_ends_with_short_syllable?
  82     assert_equal false, "bestow".porter2_ends_with_short_syllable?
  83     assert_equal false, "disturb".porter2_ends_with_short_syllable?
  84   end
  85
  86   def test_is_short_word?
  87     short_words = %w[ bed shed shred hop ]
  88     long_words = %w[ bead embed beds ]
  89     short_words.each do |w|
  90       r1 = w.porter2_r1
  91       assert_equal true, w.porter2_is_short_word?,
  92           "#{w} should be short but classified as long"
  93     end
  94     long_words.each do |w|
  95       r1 = w.porter2_r1
  96       assert_equal false, w.porter2_is_short_word?,
  97           "#{w} should be long but classified as short"
  98     end
  99   end
 100
 101   def test_step_0
 102     assert_equal "abac", "abac".porter2_step0
 103     assert_equal "abac", "abac'".porter2_step0
 104     assert_equal "abac", "abac's".porter2_step0
 105     assert_equal "abac", "abac's'".porter2_step0
 106     assert_equal "ab'c", "ab'c".porter2_step0
 107     assert_equal "ab'sc", "ab'sc".porter2_step0
 108     assert_equal "ab's'c", "ab's'c".porter2_step0
 109     assert_equal "ab'sc", "ab'sc's".porter2_step0
 110     assert_equal "'", "'".porter2_step0
 111     assert_equal "'s", "'s".porter2_step0
 112     assert_equal "'s", "'s'".porter2_step0
 113   end
 114
 115   def test_step_1a
 116     assert_equal "abacde", "abacde".porter2_step1a
 117     assert_equal "abacess", "abacesses".porter2_step1a
 118     assert_equal "tie", "ties".porter2_step1a
 119     assert_equal "tie", "tied".porter2_step1a
 120     assert_equal "cri", "cries".porter2_step1a
 121     assert_equal "cri", "cried".porter2_step1a
 122     assert_equal "gas", "gas".porter2_step1a
 123     assert_equal "this", "this".porter2_step1a
 124     assert_equal "gap", "gaps".porter2_step1a
 125     assert_equal "kiwi", "kiwis".porter2_step1a
 126     assert_equal "abacus", "abacus".porter2_step1a
 127     assert_equal "abacess", "abacess".porter2_step1a
 128   end
 129
 130   def test_step_1b
 131     assert_equal "abacde", "abacde".porter2_step1b
 132     words_non_gb = {"luxuriated" => "luxuriate", "luxuriating" => "luxuriate",
 133              "hopping" => "hop", "hopped" => "hop",
 134              "hoped" => "hope", "hoping" => "hope",
 135              "atomized" => "atomize", "atomised" => "atomis",
 136              "addicted" => "addict", "bleed" => "bleed" }
 137     words_non_gb.each do |original, stemmed|
 138       assert_equal stemmed, original.porter2_step1b,
 139           "#{original} should have stemmed to #{stemmed} but got #{original.porter2_step1b(original.porter2_r1)} instead"
 140     end
 141     words_gb = {"luxuriated" => "luxuriate", "luxuriating" => "luxuriate",
 142              "hopping" => "hop", "hopped" => "hop",
 143              "hoped" => "hope", "hoping" => "hope",
 144              "atomized" => "atomize", "atomised" => "atomise",
 145              "addicted" => "addict", "bleed" => "bleed" }
 146     words_gb.each do |original, stemmed|
 147       assert_equal stemmed, original.porter2_step1b(true),
 148           "#{original} should have stemmed to #{stemmed} but got #{original.porter2_step1b(original.porter2_r1)} instead"
 149     end
 150   end
 151
 152   def test_step_1c
 153     assert_equal "cri", "cry".porter2_step1c
 154     assert_equal "by", "by".porter2_step1c
 155     assert_equal "saY", "saY".porter2_step1c
 156     assert_equal "abbeY", "abbeY".porter2_step1c
 157   end
 158
 159   def test_step_2
 160     assert_equal "abac", "abac".porter2_step2
 161
 162     assert_equal "nationalize", "nationalization".porter2_step2
 163     assert_equal "nationalisate", "nationalisation".porter2_step2
 164     assert_equal "nationalize", "nationalization".porter2_step2(true)
 165     assert_equal "nationalise", "nationalisation".porter2_step2(true)
 166     # Repeat the steps to ensure that the english-gb behaviour isn't sticky
 167     assert_equal "nationalize", "nationalization".porter2_step2(false)
 168     assert_equal "nationalisate", "nationalisation".porter2_step2(false)
 169     assert_equal "nationalize", "nationalization".porter2_step2
 170     assert_equal "nationalisate", "nationalisation".porter2_step2
 171
 172     assert_equal "nationalize", "nationalizer".porter2_step2
 173     assert_equal "nationaliser", "nationaliser".porter2_step2
 174     assert_equal "nationalize", "nationalizer".porter2_step2(true)
 175     assert_equal "nationalise", "nationaliser".porter2_step2(true)
 176
 177     assert_equal "abaction", "abactional".porter2_step2
 178     assert_equal "abacence", "abacenci".porter2_step2
 179     assert_equal "abacance", "abacanci".porter2_step2
 180     assert_equal "abacable", "abacabli".porter2_step2
 181     assert_equal "abacent", "abacentli".porter2_step2
 182     assert_equal "abacize", "abacizer".porter2_step2
 183     assert_equal "abacize", "abacization".porter2_step2
 184     assert_equal "abacate", "abacational".porter2_step2
 185     assert_equal "abacate", "abacation".porter2_step2
 186     assert_equal "abacate", "abacator".porter2_step2
 187     assert_equal "abacal", "abacalism".porter2_step2
 188     assert_equal "abacal", "abacaliti".porter2_step2
 189     assert_equal "abacal", "abacalli".porter2_step2
 190     assert_equal "abacful", "abacfulness".porter2_step2
 191     assert_equal "abacous", "abacousli".porter2_step2
 192     assert_equal "abacous", "abacousness".porter2_step2
 193     assert_equal "abacive", "abaciveness".porter2_step2
 194     assert_equal "abacive", "abaciviti".porter2_step2
 195     assert_equal "abiliti", "abiliti".porter2_step2
 196     assert_equal "abacble", "abacbiliti".porter2_step2
 197     assert_equal "abacble", "abacbli".porter2_step2
 198     assert_equal "abacful", "abacfulli".porter2_step2
 199     assert_equal "abacless", "abaclessli".porter2_step2
 200     assert_equal "abaclog", "abaclogi".porter2_step2
 201
 202     assert_equal "abac", "abacli".porter2_step2
 203     assert_equal "abd", "abdli".porter2_step2
 204     assert_equal "abe", "abeli".porter2_step2
 205     assert_equal "abg", "abgli".porter2_step2
 206     assert_equal "abh", "abhli".porter2_step2
 207     assert_equal "abk", "abkli".porter2_step2
 208     assert_equal "abm", "abmli".porter2_step2
 209     assert_equal "abn", "abnli".porter2_step2
 210     assert_equal "abr", "abrli".porter2_step2
 211     assert_equal "abt", "abtli".porter2_step2
 212     assert_equal "abali", "abali".porter2_step2
 213
 214     assert_equal "bad", "badli".porter2_step2
 215     assert_equal "fluentli", "fluentli".porter2_step2
 216     assert_equal "geolog", "geologi".porter2_step2
 217   end
 218
 219   def test_step_3
 220     assert_equal "abac", "abac".porter2_step3("")
 221
 222     assert_equal "national", "nationalize".porter2_step3
 223     assert_equal "nationalise", "nationalise".porter2_step3
 224     assert_equal "national", "nationalise".porter2_step3(true)
 225     # Repeat the steps to ensure that the english-gb behaviour isn't sticky
 226     assert_equal "national", "nationalize".porter2_step3(false)
 227     assert_equal "nationalise", "nationalise".porter2_step3(false)
 228     assert_equal "national", "nationalize".porter2_step3
 229     assert_equal "nationalise", "nationalise".porter2_step3
 230
 231     assert_equal "abaction", "abactional".porter2_step3
 232     assert_equal "abacate", "abacational".porter2_step3
 233     assert_equal "abacic", "abacicate".porter2_step3
 234     assert_equal "abacic", "abaciciti".porter2_step3
 235     assert_equal "abacic", "abacical".porter2_step3
 236     assert_equal "abac", "abacful".porter2_step3
 237     assert_equal "abac", "abacness".porter2_step3
 238
 239     assert_equal "abacabac", "abacabacative".porter2_step3
 240     assert_equal "abacabac", "abacabacative".porter2_step3
 241
 242     assert_equal "dryness", "dryness".porter2_step3
 243   end
 244
 245   def test_step_4
 246     assert_equal "abac", "abac".porter2_step4("")
 247
 248     assert_equal "nation", "nationize".porter2_step4
 249     assert_equal "nationise", "nationise".porter2_step4
 250     assert_equal "nation", "nationize".porter2_step4(true)
 251     assert_equal "nation", "nationise".porter2_step4(true)
 252     assert_equal "nation", "nationize".porter2_step4(false)
 253     assert_equal "nationise", "nationise".porter2_step4(false)
 254     assert_equal "nation", "nationize".porter2_step4()
 255     assert_equal "nationise", "nationise".porter2_step4()
 256
 257     assert_equal "abac", "abacal".porter2_step4
 258     assert_equal "abac", "abacance".porter2_step4
 259     assert_equal "abac", "abacence".porter2_step4
 260     assert_equal "abac", "abacer".porter2_step4
 261     assert_equal "abac", "abacic".porter2_step4
 262     assert_equal "abacer", "abacerable".porter2_step4
 263     assert_equal "abac", "abacible".porter2_step4
 264     assert_equal "abac", "abacant".porter2_step4
 265     assert_equal "abac", "abacement".porter2_step4      # Check we handle overlapping suffixes properly
 266     assert_equal "abacac", "abacacement".porter2_step4
 267     assert_equal "abacac", "abacacment".porter2_step4
 268     assert_equal "abac", "abacment".porter2_step4
 269     assert_equal "abac", "abacent".porter2_step4
 270     assert_equal "abac", "abacism".porter2_step4
 271     assert_equal "abac", "abacate".porter2_step4
 272     assert_equal "abac", "abaciti".porter2_step4
 273     assert_equal "abac", "abacous".porter2_step4
 274     assert_equal "abac", "abacive".porter2_step4
 275     assert_equal "abac", "abacize".porter2_step4
 276     assert_equal "abacion", "abacion".porter2_step4
 277     assert_equal "abacs", "abacsion".porter2_step4
 278     assert_equal "abact", "abaction".porter2_step4
 279     assert_equal "abction", "abction".porter2_step4
 280     assert_equal "ablut", "ablution".porter2_step4
 281     assert_equal "agreement", "agreement".porter2_step4
 282
 283     assert_equal "abcal", "abcal".porter2_step4 # No removal if suffix isn't in R2
 284   end
 285
 286   def test_step_5
 287     assert_equal "abac", "abac".porter2_step5
 288
 289     assert_equal "abacl", "abacll".porter2_step5
 290     assert_equal "abcll", "abcll".porter2_step5
 291
 292     assert_equal "abc", "abc".porter2_step5
 293     assert_equal "abl", "able".porter2_step5
 294     assert_equal "abe", "abe".porter2_step5
 295     assert_equal "abac", "abace".porter2_step5
 296     assert_equal "bawac", "bawace".porter2_step5
 297   end
 298
 299   def test_porter2_postprocess
 300     assert_equal "abac", "abac".porter2_postprocess
 301     assert_equal "abacy", "abacy".porter2_postprocess
 302     assert_equal "abacy", "abacY".porter2_postprocess
 303     assert_equal "aybcy", "aYbcY".porter2_postprocess
 304     assert_equal "aybcy", "aYbcy".porter2_postprocess
 305   end
 306
 307 end