doc/Stemmable.html

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  61                         <div id="method-list-section" class="section">
  62                                 <h3 class="section-header">Methods</h3>
  63                                 <ul class="link-list">
  64
  65                                         <li><a href="#method-i-porter2_ends_with_short_syllable%3F">#porter2_ends_with_short_syllable?</a></li>
  66
  67                                         <li><a href="#method-i-porter2_is_short_word%3F">#porter2_is_short_word?</a></li>
  68
  69                                         <li><a href="#method-i-porter2_postprocess">#porter2_postprocess</a></li>
  70
  71                                         <li><a href="#method-i-porter2_preprocess">#porter2_preprocess</a></li>
  72
  73                                         <li><a href="#method-i-porter2_r1">#porter2_r1</a></li>
  74
  75                                         <li><a href="#method-i-porter2_r2">#porter2_r2</a></li>
  76
  77                                         <li><a href="#method-i-porter2_stem">#porter2_stem</a></li>
  78
  79                                         <li><a href="#method-i-porter2_stem_verbose">#porter2_stem_verbose</a></li>
  80
  81                                         <li><a href="#method-i-porter2_tidy">#porter2_tidy</a></li>
  82
  83                                         <li><a href="#method-i-stem">#stem</a></li>
  84
  85                                         <li><a href="#method-i-step_0">#step_0</a></li>
  86
  87                                         <li><a href="#method-i-step_1a">#step_1a</a></li>
  88
  89                                         <li><a href="#method-i-step_1b">#step_1b</a></li>
  90
  91                                         <li><a href="#method-i-step_1c">#step_1c</a></li>
  92
  93                                         <li><a href="#method-i-step_2">#step_2</a></li>
  94
  95                                         <li><a href="#method-i-step_3">#step_3</a></li>
  96
  97                                         <li><a href="#method-i-step_4">#step_4</a></li>
  98
  99                                         <li><a href="#method-i-step_5">#step_5</a></li>
 100
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 127
 128                                         <li><a href="./Stemmable.html">Stemmable</a></li>
 129
 130                                         <li><a href="./String.html">String</a></li>
 131
 132                                         <li><a href="./TestPorter2.html">TestPorter2</a></li>
 133
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 142         <div id="documentation">
 143                 <h1 class="module">Stemmable</h1>
 144
 145                 <div id="description">
 146                         <p>
 147 Porter stemmer in Ruby.
 148 </p>
 149 <p>
 150 This is the Porter 2 stemming algorithm, as described at 
 <a
 151 href="http://snowball.tartarus.org/algorithms/english/stemmer.html">snowball.tartarus.org/algorithms/english/stemmer.html</a>
 152 The original paper is:
 153 </p>
 154 <pre>
 155   Porter, 1980, An algorithm for suffix stripping, Program, Vol. 14,
 156   no. 3, pp 130-137
</pre>
 157
 158                 </div>
 159
 160                 <!-- Constants -->
 161
 162                 <div id="constants-list" class="section">
 163                         <h3 class="section-header">Constants</h3>
 164                         <dl>
 165
 166                                 <dt><a name="C">C</a></dt>
 167
 168                                 <dd class="description"><p>
 169 A non-vowel
 170 </p></dd>
 171
 172
 173                                 <dt><a name="V">V</a></dt>
 174
 175                                 <dd class="description"><p>
 176 A vowel
 177 </p></dd>
 178
 179
 180                                 <dt><a name="CW">CW</a></dt>
 181
 182                                 <dd class="description"><p>
 183 A non-vowel other than w, x, or Y
 184 </p></dd>
 185
 186
 187                                 <dt><a name="Double">Double</a></dt>
 188
 189                                 <dd class="description"><p>
 190 Doubles created when added a suffix: these are undoubled when stemmed
 191 </p></dd>
 192
 193
 194                                 <dt><a name="Valid_LI">Valid_LI</a></dt>
 195
 196                                 <dd class="description"><p>
 197 A valid letter that can come before &#8216;li&#8217;
 198 </p></dd>
 199
 200
 201                                 <dt><a name="SHORT_SYLLABLE">SHORT_SYLLABLE</a></dt>
 202
 203                                 <dd class="description"><p>
 204 A specification for a short syllable
 205 </p></dd>
 206
 207
 208                                 <dt><a name="STEP_2_MAPS">STEP_2_MAPS</a></dt>
 209
 210                                 <dd class="description"><p>
 211 Suffix transformations used in Step 2.
 (ogi, li endings dealt with in
 212 procedure)
 213 </p></dd>
 214
 215
 216                                 <dt><a name="STEP_3_MAPS">STEP_3_MAPS</a></dt>
 217
 218                                 <dd class="description"><p>
 219 Suffix transformations used in Step 3.
 (ative ending dealt with in
 220 procedure)
 221 </p></dd>
 222
 223
 224                                 <dt><a name="STEP_4_MAPS">STEP_4_MAPS</a></dt>
 225
 226                                 <dd class="description"><p>
 227 Suffix transformations used in Step 4.
 228 </p></dd>
 229
 230
 231                                 <dt><a name="SPECIAL_CASES">SPECIAL_CASES</a></dt>
 232
 233                                 <dd class="description"><p>
 234 Special-case stemmings
 235 </p></dd>
 236
 237
 238                                 <dt><a name="STEP_1A_SPECIAL_CASES">STEP_1A_SPECIAL_CASES</a></dt>
 239
 240                                 <dd class="description"><p>
 241 Special case words to ignore after step 1a.
 242 </p></dd>
 243
 244
 245                         </dl>
 246                 </div>
 247
 248
 249                 <!-- Attributes -->
 250
 251
 252                 <!-- Methods -->
 253
 254                 <div id="public-instance-method-details" class="method-section section">
 255                         <h3 class="section-header">Public Instance Methods</h3>
 256
 257
 258                         <div id="porter-ends-with-short-syllable--method" class="method-detail ">
 259                                 <a name="method-i-porter2_ends_with_short_syllable%3F"></a>
 260
 261                                 <div class="method-heading">
 262
 263                                         <span class="method-name">porter2_ends_with_short_syllable?</span><span
 264                                                 class="method-args">()</span>
 265                                         <span class="method-click-advice">click to toggle source</span>
 266
 267                                 </div>
 268
 269                                 <div class="method-description">
 270
 271                                         <p>
 272 A short syllable in a word is either
 273 </p>
 274 <ol>
 275 <li><p>
 276 a vowel followed by a non-vowel other than w, x or Y and preceded by
 277 </p>
 278 </li>
 279 </ol>
 280 <p>
 281 a non-vowel, or
 282 </p>
 283 <ol>
 284 <li><p>
 285 a vowel at the beginning of the word followed by a non-vowel.
 286 </p>
 287 </li>
 288 </ol>
 289
 290
 291
 292                                         <div class="method-source-code"
 293                                                 id="porter-ends-with-short-syllable--source">
 294 <pre>
 295      <span class="ruby-comment cmt"># File lib/porter2.rb, line 155</span>
 296 155:   <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">porter2_ends_with_short_syllable?</span>
 297 156:     <span class="ruby-keyword kw">self</span> <span class="ruby-operator">=~</span> <span class="ruby-node">/#{SHORT_SYLLABLE}$/</span> <span class="ruby-operator">?</span> <span class="ruby-keyword kw">true</span> <span class="ruby-operator">:</span> <span class="ruby-keyword kw">false</span>
 298 157:   <span class="ruby-keyword kw">end</span></pre>
 299                                         </div>
 300
 301                                 </div>
 302
 303
 304
 305
 306                         </div>
 307
 308
 309                         <div id="porter-is-short-word--method" class="method-detail ">
 310                                 <a name="method-i-porter2_is_short_word%3F"></a>
 311
 312                                 <div class="method-heading">
 313
 314                                         <span class="method-name">porter2_is_short_word?</span><span
 315                                                 class="method-args">()</span>
 316                                         <span class="method-click-advice">click to toggle source</span>
 317
 318                                 </div>
 319
 320                                 <div class="method-description">
 321
 322                                         <p>
 323 A word is short if it ends in a short syllable, and if R1 is null
 324 </p>
 325
 326
 327
 328                                         <div class="method-source-code"
 329                                                 id="porter-is-short-word--source">
 330 <pre>
 331      <span class="ruby-comment cmt"># File lib/porter2.rb, line 160</span>
 332 160:   <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">porter2_is_short_word?</span>
 333 161:     <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">porter2_ends_with_short_syllable?</span> <span class="ruby-keyword kw">and</span> <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">porter2_r1</span>.<span class="ruby-identifier">empty?</span>
 334 162:   <span class="ruby-keyword kw">end</span></pre>
 335                                         </div>
 336
 337                                 </div>
 338
 339
 340
 341
 342                         </div>
 343
 344
 345                         <div id="porter-postprocess-method" class="method-detail ">
 346                                 <a name="method-i-porter2_postprocess"></a>
 347
 348                                 <div class="method-heading">
 349
 350                                         <span class="method-name">porter2_postprocess</span><span
 351                                                 class="method-args">()</span>
 352                                         <span class="method-click-advice">click to toggle source</span>
 353
 354                                 </div>
 355
 356                                 <div class="method-description">
 357
 358
 359
 360
 361
 362                                         <div class="method-source-code"
 363                                                 id="porter-postprocess-source">
 364 <pre>
 365      <span class="ruby-comment cmt"># File lib/porter2.rb, line 311</span>
 366 311:   <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">porter2_postprocess</span>
 367 312:     <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">gsub</span>(<span class="ruby-regexp re">/Y/</span>, <span class="ruby-value str">'y'</span>)
 368 313:   <span class="ruby-keyword kw">end</span></pre>
 369                                         </div>
 370
 371                                 </div>
 372
 373
 374
 375
 376                         </div>
 377
 378
 379                         <div id="porter-preprocess-method" class="method-detail ">
 380                                 <a name="method-i-porter2_preprocess"></a>
 381
 382                                 <div class="method-heading">
 383
 384                                         <span class="method-name">porter2_preprocess</span><span
 385                                                 class="method-args">()</span>
 386                                         <span class="method-click-advice">click to toggle source</span>
 387
 388                                 </div>
 389
 390                                 <div class="method-description">
 391
 392
 393
 394
 395
 396                                         <div class="method-source-code"
 397                                                 id="porter-preprocess-source">
 398 <pre>
 399      <span class="ruby-comment cmt"># File lib/porter2.rb, line 122</span>
 400 122:   <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">porter2_preprocess</span>
 401 123:     <span class="ruby-identifier">w</span> = <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">dup</span>
 402 124:
 403 125:     <span class="ruby-comment cmt"># remove any initial apostrophe
</span>
 404 126:     <span class="ruby-identifier">w</span>.<span class="ruby-identifier">gsub!</span>(<span class="ruby-regexp re">/^'*(.)/</span>, <span class="ruby-value str">'\1'</span>)
 405 127:
 406 128:     <span class="ruby-comment cmt"># set initial y, or y after a vowel, to Y
</span>
 407 129:     <span class="ruby-identifier">w</span>.<span class="ruby-identifier">gsub!</span>(<span class="ruby-regexp re">/^y/</span>, <span class="ruby-value str">&quot;Y&quot;</span>)
 408 130:     <span class="ruby-identifier">w</span>.<span class="ruby-identifier">gsub!</span>(<span class="ruby-node">/(#{V})y/</span>, <span class="ruby-value str">'\1Y'</span>)
 409 131:
 410 132:     <span class="ruby-identifier">w</span>
 411 133:   <span class="ruby-keyword kw">end</span></pre>
 412                                         </div>
 413
 414                                 </div>
 415
 416
 417
 418
 419                         </div>
 420
 421
 422                         <div id="porter-r--method" class="method-detail ">
 423                                 <a name="method-i-porter2_r1"></a>
 424
 425                                 <div class="method-heading">
 426
 427                                         <span class="method-name">porter2_r1</span><span
 428                                                 class="method-args">()</span>
 429                                         <span class="method-click-advice">click to toggle source</span>
 430
 431                                 </div>
 432
 433                                 <div class="method-description">
 434
 435                                         <p>
 436 The word after the first non-vowel after the first vowel
 437 </p>
 438
 439
 440
 441                                         <div class="method-source-code"
 442                                                 id="porter-r--source">
 443 <pre>
 444      <span class="ruby-comment cmt"># File lib/porter2.rb, line 136</span>
 445 136:   <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">porter2_r1</span>
 446 137:     <span class="ruby-keyword kw">if</span> <span class="ruby-keyword kw">self</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/^(gener|commun|arsen)(?&lt;r1&gt;.*)/</span>
 447 138:       <span class="ruby-constant">Regexp</span>.<span class="ruby-identifier">last_match</span>(<span class="ruby-value">:r1</span>)
 448 139:     <span class="ruby-keyword kw">else</span>
 449 140:       <span class="ruby-keyword kw">self</span> <span class="ruby-operator">=~</span> <span class="ruby-node">/#{V}#{C}(?&lt;r1&gt;.*)$/</span>
 450 141:       <span class="ruby-constant">Regexp</span>.<span class="ruby-identifier">last_match</span>(<span class="ruby-value">:r1</span>) <span class="ruby-operator">||</span> <span class="ruby-value str">&quot;&quot;</span>
 451 142:     <span class="ruby-keyword kw">end</span>
 452 143:   <span class="ruby-keyword kw">end</span></pre>
 453                                         </div>
 454
 455                                 </div>
 456
 457
 458
 459
 460                         </div>
 461
 462
 463                         <div id="porter-r--method" class="method-detail ">
 464                                 <a name="method-i-porter2_r2"></a>
 465
 466                                 <div class="method-heading">
 467
 468                                         <span class="method-name">porter2_r2</span><span
 469                                                 class="method-args">()</span>
 470                                         <span class="method-click-advice">click to toggle source</span>
 471
 472                                 </div>
 473
 474                                 <div class="method-description">
 475
 476                                         <p>
 477 R1 after the first non-vowel after the first vowel
 478 </p>
 479
 480
 481
 482                                         <div class="method-source-code"
 483                                                 id="porter-r--source">
 484 <pre>
 485      <span class="ruby-comment cmt"># File lib/porter2.rb, line 146</span>
 486 146:   <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">porter2_r2</span>
 487 147:     <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">porter2_r1</span> <span class="ruby-operator">=~</span> <span class="ruby-node">/#{V}#{C}(?&lt;r2&gt;.*)$/</span>
 488 148:     <span class="ruby-constant">Regexp</span>.<span class="ruby-identifier">last_match</span>(<span class="ruby-value">:r2</span>) <span class="ruby-operator">||</span> <span class="ruby-value str">&quot;&quot;</span>
 489 149:   <span class="ruby-keyword kw">end</span></pre>
 490                                         </div>
 491
 492                                 </div>
 493
 494
 495
 496
 497                         </div>
 498
 499
 500                         <div id="porter-stem-method" class="method-detail ">
 501                                 <a name="method-i-porter2_stem"></a>
 502
 503                                 <div class="method-heading">
 504
 505                                         <span class="method-name">porter2_stem</span><span
 506                                                 class="method-args">(gb_english = false)</span>
 507                                         <span class="method-click-advice">click to toggle source</span>
 508
 509                                 </div>
 510
 511                                 <div class="method-description">
 512
 513
 514
 515
 516
 517                                         <div class="method-source-code"
 518                                                 id="porter-stem-source">
 519 <pre>
 520      <span class="ruby-comment cmt"># File lib/porter2.rb, line 316</span>
 521 316:   <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">porter2_stem</span>(<span class="ruby-identifier">gb_english</span> = <span class="ruby-keyword kw">false</span>)
 522 317:     <span class="ruby-identifier">preword</span> = <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">porter2_tidy</span>
 523 318:     <span class="ruby-keyword kw">return</span> <span class="ruby-identifier">preword</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">preword</span>.<span class="ruby-identifier">length</span> <span class="ruby-operator">&lt;=</span> <span class="ruby-value">2</span>
 524 319:
 525 320:     <span class="ruby-identifier">word</span> = <span class="ruby-identifier">preword</span>.<span class="ruby-identifier">porter2_preprocess</span>
 526 321:
 527 322:     <span class="ruby-keyword kw">if</span> <span class="ruby-constant">SPECIAL_CASES</span>.<span class="ruby-identifier">has_key?</span> <span class="ruby-identifier">word</span>
 528 323:       <span class="ruby-constant">SPECIAL_CASES</span>[<span class="ruby-identifier">word</span>]
 529 324:     <span class="ruby-keyword kw">else</span>
 530 325:       <span class="ruby-identifier">w1a</span> = <span class="ruby-identifier">word</span>.<span class="ruby-identifier">step_0</span>.<span class="ruby-identifier">step_1a</span>
 531 326:       <span class="ruby-keyword kw">if</span> <span class="ruby-constant">STEP_1A_SPECIAL_CASES</span>.<span class="ruby-identifier">include?</span> <span class="ruby-identifier">w1a</span>
 532 327:         <span class="ruby-identifier">w1a</span>
 533 328:       <span class="ruby-keyword kw">else</span>
 534 329:         <span class="ruby-identifier">w1a</span>.<span class="ruby-identifier">step_1b</span>(<span class="ruby-identifier">gb_english</span>).<span class="ruby-identifier">step_1c</span>.<span class="ruby-identifier">step_2</span>(<span class="ruby-identifier">gb_english</span>).<span class="ruby-identifier">step_3</span>(<span class="ruby-identifier">gb_english</span>).<span class="ruby-identifier">step_4</span>(<span class="ruby-identifier">gb_english</span>).<span class="ruby-identifier">step_5</span>.<span class="ruby-identifier">porter2_postprocess</span>
 535 330:       <span class="ruby-keyword kw">end</span>
 536 331:     <span class="ruby-keyword kw">end</span>
 537 332:   <span class="ruby-keyword kw">end</span></pre>
 538                                         </div>
 539
 540                                 </div>
 541
 542
 543                                 <div class="aliases">
 544                                         Also aliased as: <a href="Stemmable.html#method-i-stem">stem</a>
 545                                 </div>
 546
 547
 548
 549                         </div>
 550
 551
 552                         <div id="porter-stem-verbose-method" class="method-detail ">
 553                                 <a name="method-i-porter2_stem_verbose"></a>
 554
 555                                 <div class="method-heading">
 556
 557                                         <span class="method-name">porter2_stem_verbose</span><span
 558                                                 class="method-args">(gb_english = false)</span>
 559                                         <span class="method-click-advice">click to toggle source</span>
 560
 561                                 </div>
 562
 563                                 <div class="method-description">
 564
 565
 566
 567
 568
 569                                         <div class="method-source-code"
 570                                                 id="porter-stem-verbose-source">
 571 <pre>
 572      <span class="ruby-comment cmt"># File lib/porter2.rb, line 334</span>
 573 334:   <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">porter2_stem_verbose</span>(<span class="ruby-identifier">gb_english</span> = <span class="ruby-keyword kw">false</span>)
 574 335:     <span class="ruby-identifier">preword</span> = <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">porter2_tidy</span>
 575 336:     <span class="ruby-identifier">puts</span> <span class="ruby-node">&quot;Preword: #{preword}&quot;</span>
 576 337:     <span class="ruby-keyword kw">return</span> <span class="ruby-identifier">preword</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">preword</span>.<span class="ruby-identifier">length</span> <span class="ruby-operator">&lt;=</span> <span class="ruby-value">2</span>
 577 338:
 578 339:     <span class="ruby-identifier">word</span> = <span class="ruby-identifier">preword</span>.<span class="ruby-identifier">porter2_preprocess</span>
 579 340:     <span class="ruby-identifier">puts</span> <span class="ruby-node">&quot;Preprocessed: #{word}&quot;</span>
 580 341:
 581 342:     <span class="ruby-keyword kw">if</span> <span class="ruby-constant">SPECIAL_CASES</span>.<span class="ruby-identifier">has_key?</span> <span class="ruby-identifier">word</span>
 582 343:       <span class="ruby-identifier">puts</span> <span class="ruby-node">&quot;Returning #{word} as special case #{SPECIAL_CASES[word]}&quot;</span>
 583 344:       <span class="ruby-constant">SPECIAL_CASES</span>[<span class="ruby-identifier">word</span>]
 584 345:     <span class="ruby-keyword kw">else</span>
 585 346:       <span class="ruby-identifier">r1</span> = <span class="ruby-identifier">word</span>.<span class="ruby-identifier">porter2_r1</span>
 586 347:       <span class="ruby-identifier">r2</span> = <span class="ruby-identifier">word</span>.<span class="ruby-identifier">porter2_r2</span>
 587 348:       <span class="ruby-identifier">puts</span> <span class="ruby-node">&quot;R1 = #{r1}, R2 = #{r2}&quot;</span>
 588 349:
 589 350:       <span class="ruby-identifier">w0</span> = <span class="ruby-identifier">word</span>.<span class="ruby-identifier">step_0</span> ; <span class="ruby-identifier">puts</span> <span class="ruby-node">&quot;After step 0:  #{w0} (R1 = #{w0.porter2_r1}, R2 = #{w0.porter2_r2})&quot;</span>
 590 351:       <span class="ruby-identifier">w1a</span> = <span class="ruby-identifier">w0</span>.<span class="ruby-identifier">step_1a</span> ; <span class="ruby-identifier">puts</span> <span class="ruby-node">&quot;After step 1a: #{w1a} (R1 = #{w1a.porter2_r1}, R2 = #{w1a.porter2_r2})&quot;</span>
 591 352:
 592 353:       <span class="ruby-keyword kw">if</span> <span class="ruby-constant">STEP_1A_SPECIAL_CASES</span>.<span class="ruby-identifier">include?</span> <span class="ruby-identifier">w1a</span>
 593 354:         <span class="ruby-identifier">puts</span> <span class="ruby-node">&quot;Returning #{w1a} as 1a special case&quot;</span>
 594 355:         <span class="ruby-identifier">w1a</span>
 595 356:       <span class="ruby-keyword kw">else</span>
 596 357:         <span class="ruby-identifier">w1b</span> = <span class="ruby-identifier">w1a</span>.<span class="ruby-identifier">step_1b</span>(<span class="ruby-identifier">gb_english</span>) ; <span class="ruby-identifier">puts</span> <span class="ruby-node">&quot;After step 1b: #{w1b} (R1 = #{w1b.porter2_r1}, R2 = #{w1b.porter2_r2})&quot;</span>
 597 358:         <span class="ruby-identifier">w1c</span> = <span class="ruby-identifier">w1b</span>.<span class="ruby-identifier">step_1c</span> ; <span class="ruby-identifier">puts</span> <span class="ruby-node">&quot;After step 1c: #{w1c} (R1 = #{w1c.porter2_r1}, R2 = #{w1c.porter2_r2})&quot;</span>
 598 359:         <span class="ruby-identifier">w2</span> = <span class="ruby-identifier">w1c</span>.<span class="ruby-identifier">step_2</span>(<span class="ruby-identifier">gb_english</span>) ; <span class="ruby-identifier">puts</span> <span class="ruby-node">&quot;After step 2:  #{w2} (R1 = #{w2.porter2_r1}, R2 = #{w2.porter2_r2})&quot;</span>
 599 360:         <span class="ruby-identifier">w3</span> = <span class="ruby-identifier">w2</span>.<span class="ruby-identifier">step_3</span>(<span class="ruby-identifier">gb_english</span>) ; <span class="ruby-identifier">puts</span> <span class="ruby-node">&quot;After step 3:  #{w3} (R1 = #{w3.porter2_r1}, R2 = #{w3.porter2_r2})&quot;</span>
 600 361:         <span class="ruby-identifier">w4</span> = <span class="ruby-identifier">w3</span>.<span class="ruby-identifier">step_4</span>(<span class="ruby-identifier">gb_english</span>) ; <span class="ruby-identifier">puts</span> <span class="ruby-node">&quot;After step 4:  #{w4} (R1 = #{w4.porter2_r1}, R2 = #{w4.porter2_r2})&quot;</span>
 601 362:         <span class="ruby-identifier">w5</span> = <span class="ruby-identifier">w4</span>.<span class="ruby-identifier">step_5</span> ; <span class="ruby-identifier">puts</span> <span class="ruby-node">&quot;After step 5:  #{w5}&quot;</span>
 602 363:         <span class="ruby-identifier">wpost</span> = <span class="ruby-identifier">w5</span>.<span class="ruby-identifier">porter2_postprocess</span> ; <span class="ruby-identifier">puts</span> <span class="ruby-node">&quot;After postprocess: #{wpost}&quot;</span>
 603 364:         <span class="ruby-identifier">wpost</span>
 604 365:       <span class="ruby-keyword kw">end</span>
 605 366:     <span class="ruby-keyword kw">end</span>
 606 367:   <span class="ruby-keyword kw">end</span></pre>
 607                                         </div>
 608
 609                                 </div>
 610
 611
 612
 613
 614                         </div>
 615
 616
 617                         <div id="porter-tidy-method" class="method-detail ">
 618                                 <a name="method-i-porter2_tidy"></a>
 619
 620                                 <div class="method-heading">
 621
 622                                         <span class="method-name">porter2_tidy</span><span
 623                                                 class="method-args">()</span>
 624                                         <span class="method-click-advice">click to toggle source</span>
 625
 626                                 </div>
 627
 628                                 <div class="method-description">
 629
 630                                         <p>
 631 Tidy up the word before we get down to the algorithm
 632 </p>
 633
 634
 635
 636                                         <div class="method-source-code"
 637                                                 id="porter-tidy-source">
 638 <pre>
 639      <span class="ruby-comment cmt"># File lib/porter2.rb, line 112</span>
 640 112:   <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">porter2_tidy</span>
 641 113:     <span class="ruby-identifier">preword</span> = <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">to_s</span>.<span class="ruby-identifier">strip</span>.<span class="ruby-identifier">downcase</span>
 642 114:
 643 115:     <span class="ruby-comment cmt"># map apostrophe-like characters to apostrophes
</span>
 644 116:     <span class="ruby-identifier">preword</span>.<span class="ruby-identifier">gsub!</span>(<span class="ruby-regexp re">/‘/</span>, <span class="ruby-value str">&quot;'&quot;</span>)
 645 117:     <span class="ruby-identifier">preword</span>.<span class="ruby-identifier">gsub!</span>(<span class="ruby-regexp re">/’/</span>, <span class="ruby-value str">&quot;'&quot;</span>)
 646 118:
 647 119:     <span class="ruby-identifier">preword</span>
 648 120:   <span class="ruby-keyword kw">end</span></pre>
 649                                         </div>
 650
 651                                 </div>
 652
 653
 654
 655
 656                         </div>
 657
 658
 659                         <div id="stem-method" class="method-detail method-alias">
 660                                 <a name="method-i-stem"></a>
 661
 662                                 <div class="method-heading">
 663
 664                                         <span class="method-name">stem</span><span
 665                                                 class="method-args">(gb_english = false)</span>
 666                                         <span class="method-click-advice">click to toggle source</span>
 667
 668                                 </div>
 669
 670                                 <div class="method-description">
 671
 672
 673
 674
 675
 676                                 </div>
 677
 678
 679
 680
 681                                 <div class="aliases">
 682           Alias for: <a href="Stemmable.html#method-i-porter2_stem">porter2_stem</a>
 683                                 </div>
 684
 685                         </div>
 686
 687
 688                         <div id="step--method" class="method-detail ">
 689                                 <a name="method-i-step_0"></a>
 690
 691                                 <div class="method-heading">
 692
 693                                         <span class="method-name">step_0</span><span
 694                                                 class="method-args">()</span>
 695                                         <span class="method-click-advice">click to toggle source</span>
 696
 697                                 </div>
 698
 699                                 <div class="method-description">
 700
 701                                         <p>
 702 Search for the longest among the suffixes,
 703 </p>
 704 <ul>
 705 <li><p>
 706 &#8217;
 707 </p>
 708 </li>
 709 <li><p>
 710 &#8217;s
 711 </p>
 712 </li>
 713 <li><p>
 714 &#8217;s&#8217;
 715 </p>
 716 </li>
 717 </ul>
 718 <p>
 719 and remove if found.
 720 </p>
 721
 722
 723
 724                                         <div class="method-source-code"
 725                                                 id="step--source">
 726 <pre>
 727      <span class="ruby-comment cmt"># File lib/porter2.rb, line 169</span>
 728 169:   <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">step_0</span>
 729 170:     <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sub!</span>(<span class="ruby-regexp re">/(.)('s'|'s|')$/</span>, <span class="ruby-value str">'\1'</span>) <span class="ruby-operator">||</span> <span class="ruby-keyword kw">self</span>
 730 171:   <span class="ruby-keyword kw">end</span></pre>
 731                                         </div>
 732
 733                                 </div>
 734
 735
 736
 737
 738                         </div>
 739
 740
 741                         <div id="step-a-method" class="method-detail ">
 742                                 <a name="method-i-step_1a"></a>
 743
 744                                 <div class="method-heading">
 745
 746                                         <span class="method-name">step_1a</span><span
 747                                                 class="method-args">()</span>
 748                                         <span class="method-click-advice">click to toggle source</span>
 749
 750                                 </div>
 751
 752                                 <div class="method-description">
 753
 754                                         <p>
 755 Remove plural suffixes
 756 </p>
 757
 758
 759
 760                                         <div class="method-source-code"
 761                                                 id="step-a-source">
 762 <pre>
 763      <span class="ruby-comment cmt"># File lib/porter2.rb, line 174</span>
 764 174:   <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">step_1a</span>
 765 175:     <span class="ruby-keyword kw">if</span> <span class="ruby-keyword kw">self</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/sses$/</span>
 766 176:       <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-regexp re">/sses$/</span>, <span class="ruby-value str">'ss'</span>)
 767 177:     <span class="ruby-keyword kw">elsif</span> <span class="ruby-keyword kw">self</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/..(ied|ies)$/</span>
 768 178:       <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-regexp re">/(ied|ies)$/</span>, <span class="ruby-value str">'i'</span>)
 769 179:     <span class="ruby-keyword kw">elsif</span> <span class="ruby-keyword kw">self</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/(ied|ies)$/</span>
 770 180:       <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-regexp re">/(ied|ies)$/</span>, <span class="ruby-value str">'ie'</span>)
 771 181:     <span class="ruby-keyword kw">elsif</span> <span class="ruby-keyword kw">self</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/(us|ss)$/</span>
 772 182:       <span class="ruby-keyword kw">self</span>
 773 183:     <span class="ruby-keyword kw">elsif</span> <span class="ruby-keyword kw">self</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/s$/</span>
 774 184:       <span class="ruby-keyword kw">if</span> <span class="ruby-keyword kw">self</span> <span class="ruby-operator">=~</span> <span class="ruby-node">/(#{V}.+)s$/</span>
 775 185:         <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-regexp re">/s$/</span>, <span class="ruby-value str">''</span>)
 776 186:       <span class="ruby-keyword kw">else</span>
 777 187:         <span class="ruby-keyword kw">self</span>
 778 188:       <span class="ruby-keyword kw">end</span>
 779 189:     <span class="ruby-keyword kw">else</span>
 780 190:       <span class="ruby-keyword kw">self</span>
 781 191:     <span class="ruby-keyword kw">end</span>
 782 192:   <span class="ruby-keyword kw">end</span></pre>
 783                                         </div>
 784
 785                                 </div>
 786
 787
 788
 789
 790                         </div>
 791
 792
 793                         <div id="step-b-method" class="method-detail ">
 794                                 <a name="method-i-step_1b"></a>
 795
 796                                 <div class="method-heading">
 797
 798                                         <span class="method-name">step_1b</span><span
 799                                                 class="method-args">(gb_english = false)</span>
 800                                         <span class="method-click-advice">click to toggle source</span>
 801
 802                                 </div>
 803
 804                                 <div class="method-description">
 805
 806
 807
 808
 809
 810                                         <div class="method-source-code"
 811                                                 id="step-b-source">
 812 <pre>
 813      <span class="ruby-comment cmt"># File lib/porter2.rb, line 194</span>
 814 194:   <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">step_1b</span>(<span class="ruby-identifier">gb_english</span> = <span class="ruby-keyword kw">false</span>)
 815 195:     <span class="ruby-keyword kw">if</span> <span class="ruby-keyword kw">self</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/(eed|eedly)$/</span>
 816 196:       <span class="ruby-keyword kw">if</span> <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">porter2_r1</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/(eed|eedly)$/</span>
 817 197:         <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-regexp re">/(eed|eedly)$/</span>, <span class="ruby-value str">'ee'</span>)
 818 198:       <span class="ruby-keyword kw">else</span>
 819 199:         <span class="ruby-keyword kw">self</span>
 820 200:       <span class="ruby-keyword kw">end</span>
 821 201:     <span class="ruby-keyword kw">else</span>
 822 202:       <span class="ruby-identifier">w</span> = <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">dup</span>
 823 203:       <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">w</span> <span class="ruby-operator">=~</span> <span class="ruby-node">/#{V}.*(ed|edly|ing|ingly)$/</span>
 824 204:         <span class="ruby-identifier">w</span>.<span class="ruby-identifier">sub!</span>(<span class="ruby-regexp re">/(ed|edly|ing|ingly)$/</span>, <span class="ruby-value str">''</span>)
 825 205:         <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">w</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/(at|lb|iz)$/</span>
 826 206:           <span class="ruby-identifier">w</span> <span class="ruby-operator">+=</span> <span class="ruby-value str">'e'</span>
 827 207:         <span class="ruby-keyword kw">elsif</span> <span class="ruby-identifier">w</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/is$/</span> <span class="ruby-keyword kw">and</span> <span class="ruby-identifier">gb_english</span>
 828 208:           <span class="ruby-identifier">w</span> <span class="ruby-operator">+=</span> <span class="ruby-value str">'e'</span>
 829 209:         <span class="ruby-keyword kw">elsif</span> <span class="ruby-identifier">w</span> <span class="ruby-operator">=~</span> <span class="ruby-node">/#{Double}$/</span>
 830 210:           <span class="ruby-identifier">w</span>.<span class="ruby-identifier">chop!</span>
 831 211:         <span class="ruby-keyword kw">elsif</span> <span class="ruby-identifier">w</span>.<span class="ruby-identifier">porter2_is_short_word?</span>
 832 212:           <span class="ruby-identifier">w</span> <span class="ruby-operator">+=</span> <span class="ruby-value str">'e'</span>
 833 213:         <span class="ruby-keyword kw">end</span>
 834 214:       <span class="ruby-keyword kw">end</span>
 835 215:       <span class="ruby-identifier">w</span>
 836 216:     <span class="ruby-keyword kw">end</span>
 837 217:   <span class="ruby-keyword kw">end</span></pre>
 838                                         </div>
 839
 840                                 </div>
 841
 842
 843
 844
 845                         </div>
 846
 847
 848                         <div id="step-c-method" class="method-detail ">
 849                                 <a name="method-i-step_1c"></a>
 850
 851                                 <div class="method-heading">
 852
 853                                         <span class="method-name">step_1c</span><span
 854                                                 class="method-args">()</span>
 855                                         <span class="method-click-advice">click to toggle source</span>
 856
 857                                 </div>
 858
 859                                 <div class="method-description">
 860
 861
 862
 863
 864
 865                                         <div class="method-source-code"
 866                                                 id="step-c-source">
 867 <pre>
 868      <span class="ruby-comment cmt"># File lib/porter2.rb, line 220</span>
 869 220:   <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">step_1c</span>
 870 221:     <span class="ruby-keyword kw">if</span> <span class="ruby-keyword kw">self</span> <span class="ruby-operator">=~</span> <span class="ruby-node">/.+#{C}(y|Y)$/</span>
 871 222:       <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-regexp re">/(y|Y)$/</span>, <span class="ruby-value str">'i'</span>)
 872 223:     <span class="ruby-keyword kw">else</span>
 873 224:       <span class="ruby-keyword kw">self</span>
 874 225:     <span class="ruby-keyword kw">end</span>
 875 226:   <span class="ruby-keyword kw">end</span></pre>
 876                                         </div>
 877
 878                                 </div>
 879
 880
 881
 882
 883                         </div>
 884
 885
 886                         <div id="step--method" class="method-detail ">
 887                                 <a name="method-i-step_2"></a>
 888
 889                                 <div class="method-heading">
 890
 891                                         <span class="method-name">step_2</span><span
 892                                                 class="method-args">(gb_english = false)</span>
 893                                         <span class="method-click-advice">click to toggle source</span>
 894
 895                                 </div>
 896
 897                                 <div class="method-description">
 898
 899
 900
 901
 902
 903                                         <div class="method-source-code"
 904                                                 id="step--source">
 905 <pre>
 906      <span class="ruby-comment cmt"># File lib/porter2.rb, line 229</span>
 907 229:   <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">step_2</span>(<span class="ruby-identifier">gb_english</span> = <span class="ruby-keyword kw">false</span>)
 908 230:     <span class="ruby-identifier">r1</span> = <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">porter2_r1</span>
 909 231:     <span class="ruby-identifier">s2m</span> = <span class="ruby-constant">STEP_2_MAPS</span>.<span class="ruby-identifier">dup</span>
 910 232:     <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">gb_english</span>
 911 233:       <span class="ruby-identifier">s2m</span>[<span class="ruby-value str">&quot;iser&quot;</span>] = <span class="ruby-value str">&quot;ise&quot;</span>
 912 234:       <span class="ruby-identifier">s2m</span>[<span class="ruby-value str">&quot;isation&quot;</span>] = <span class="ruby-value str">&quot;ise&quot;</span>
 913 235:     <span class="ruby-keyword kw">end</span>
 914 236:     <span class="ruby-identifier">step_2_re</span> = <span class="ruby-constant">Regexp</span>.<span class="ruby-identifier">union</span>(<span class="ruby-identifier">s2m</span>.<span class="ruby-identifier">keys</span>.<span class="ruby-identifier">map</span> {<span class="ruby-operator">|</span><span class="ruby-identifier">r</span><span class="ruby-operator">|</span> <span class="ruby-constant">Regexp</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">r</span> <span class="ruby-operator">+</span> <span class="ruby-value str">&quot;$&quot;</span>)})
 915 237:     <span class="ruby-keyword kw">if</span> <span class="ruby-keyword kw">self</span> <span class="ruby-operator">=~</span> <span class="ruby-identifier">step_2_re</span>
 916 238:       <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">r1</span> <span class="ruby-operator">=~</span> <span class="ruby-node">/#{$&amp;}$/</span>
 917 239:         <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-node">/#{$&amp;}$/</span>, <span class="ruby-identifier">s2m</span>[<span class="ruby-node">$&amp;</span>])
 918 240:       <span class="ruby-keyword kw">else</span>
 919 241:         <span class="ruby-keyword kw">self</span>
 920 242:       <span class="ruby-keyword kw">end</span>
 921 243:     <span class="ruby-keyword kw">elsif</span> <span class="ruby-identifier">r1</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/li$/</span> <span class="ruby-keyword kw">and</span> <span class="ruby-keyword kw">self</span> <span class="ruby-operator">=~</span> <span class="ruby-node">/(#{Valid_LI})li$/</span>
 922 244:       <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-regexp re">/li$/</span>, <span class="ruby-value str">''</span>)
 923 245:     <span class="ruby-keyword kw">elsif</span> <span class="ruby-identifier">r1</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/ogi$/</span> <span class="ruby-keyword kw">and</span> <span class="ruby-keyword kw">self</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/logi$/</span>
 924 246:       <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-regexp re">/ogi$/</span>, <span class="ruby-value str">'og'</span>)
 925 247:     <span class="ruby-keyword kw">else</span>
 926 248:       <span class="ruby-keyword kw">self</span>
 927 249:     <span class="ruby-keyword kw">end</span>
 928 250:   <span class="ruby-keyword kw">end</span></pre>
 929                                         </div>
 930
 931                                 </div>
 932
 933
 934
 935
 936                         </div>
 937
 938
 939                         <div id="step--method" class="method-detail ">
 940                                 <a name="method-i-step_3"></a>
 941
 942                                 <div class="method-heading">
 943
 944                                         <span class="method-name">step_3</span><span
 945                                                 class="method-args">(gb_english = false)</span>
 946                                         <span class="method-click-advice">click to toggle source</span>
 947
 948                                 </div>
 949
 950                                 <div class="method-description">
 951
 952
 953
 954
 955
 956                                         <div class="method-source-code"
 957                                                 id="step--source">
 958 <pre>
 959      <span class="ruby-comment cmt"># File lib/porter2.rb, line 253</span>
 960 253:   <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">step_3</span>(<span class="ruby-identifier">gb_english</span> = <span class="ruby-keyword kw">false</span>)
 961 254:     <span class="ruby-keyword kw">if</span> <span class="ruby-keyword kw">self</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/ative$/</span> <span class="ruby-keyword kw">and</span> <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">porter2_r2</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/ative$/</span>
 962 255:       <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-regexp re">/ative$/</span>, <span class="ruby-value str">''</span>)
 963 256:     <span class="ruby-keyword kw">else</span>
 964 257:       <span class="ruby-identifier">s3m</span> = <span class="ruby-constant">STEP_3_MAPS</span>.<span class="ruby-identifier">dup</span>
 965 258:       <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">gb_english</span>
 966 259:         <span class="ruby-identifier">s3m</span>[<span class="ruby-value str">&quot;alise&quot;</span>] = <span class="ruby-value str">&quot;al&quot;</span>
 967 260:       <span class="ruby-keyword kw">end</span>
 968 261:       <span class="ruby-identifier">step_3_re</span> = <span class="ruby-constant">Regexp</span>.<span class="ruby-identifier">union</span>(<span class="ruby-identifier">s3m</span>.<span class="ruby-identifier">keys</span>.<span class="ruby-identifier">map</span> {<span class="ruby-operator">|</span><span class="ruby-identifier">r</span><span class="ruby-operator">|</span> <span class="ruby-constant">Regexp</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">r</span> <span class="ruby-operator">+</span> <span class="ruby-value str">&quot;$&quot;</span>)})
 969 262:       <span class="ruby-identifier">r1</span> = <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">porter2_r1</span>
 970 263:       <span class="ruby-keyword kw">if</span> <span class="ruby-keyword kw">self</span> <span class="ruby-operator">=~</span> <span class="ruby-identifier">step_3_re</span> <span class="ruby-keyword kw">and</span> <span class="ruby-identifier">r1</span> <span class="ruby-operator">=~</span> <span class="ruby-node">/#{$&amp;}$/</span>
 971 264:         <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-node">/#{$&amp;}$/</span>, <span class="ruby-identifier">s3m</span>[<span class="ruby-node">$&amp;</span>])
 972 265:       <span class="ruby-keyword kw">else</span>
 973 266:         <span class="ruby-keyword kw">self</span>
 974 267:       <span class="ruby-keyword kw">end</span>
 975 268:     <span class="ruby-keyword kw">end</span>
 976 269:   <span class="ruby-keyword kw">end</span></pre>
 977                                         </div>
 978
 979                                 </div>
 980
 981
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 984                         </div>
 985
 986
 987                         <div id="step--method" class="method-detail ">
 988                                 <a name="method-i-step_4"></a>
 989
 990                                 <div class="method-heading">
 991
 992                                         <span class="method-name">step_4</span><span
 993                                                 class="method-args">(gb_english = false)</span>
 994                                         <span class="method-click-advice">click to toggle source</span>
 995
 996                                 </div>
 997
 998                                 <div class="method-description">
 999
1000
1001
1002
1003
1004                                         <div class="method-source-code"
1005                                                 id="step--source">
1006 <pre>
1007      <span class="ruby-comment cmt"># File lib/porter2.rb, line 272</span>
1008 272:   <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">step_4</span>(<span class="ruby-identifier">gb_english</span> = <span class="ruby-keyword kw">false</span>)
1009 273:     <span class="ruby-keyword kw">if</span> <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">porter2_r2</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/ion$/</span> <span class="ruby-keyword kw">and</span> <span class="ruby-keyword kw">self</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/(s|t)ion$/</span>
1010 274:       <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-regexp re">/ion$/</span>, <span class="ruby-value str">''</span>)
1011 275:     <span class="ruby-keyword kw">else</span>
1012 276:       <span class="ruby-identifier">s4m</span> = <span class="ruby-constant">STEP_4_MAPS</span>.<span class="ruby-identifier">dup</span>
1013 277:       <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">gb_english</span>
1014 278:         <span class="ruby-identifier">s4m</span>[<span class="ruby-value str">&quot;ise&quot;</span>] = <span class="ruby-value str">&quot;&quot;</span>
1015 279:       <span class="ruby-keyword kw">end</span>
1016 280:       <span class="ruby-identifier">step_4_re</span> = <span class="ruby-constant">Regexp</span>.<span class="ruby-identifier">union</span>(<span class="ruby-identifier">s4m</span>.<span class="ruby-identifier">keys</span>.<span class="ruby-identifier">map</span> {<span class="ruby-operator">|</span><span class="ruby-identifier">r</span><span class="ruby-operator">|</span> <span class="ruby-constant">Regexp</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">r</span> <span class="ruby-operator">+</span> <span class="ruby-value str">&quot;$&quot;</span>)})
1017 281:       <span class="ruby-identifier">r2</span> = <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">porter2_r2</span>
1018 282:       <span class="ruby-keyword kw">if</span> <span class="ruby-keyword kw">self</span> <span class="ruby-operator">=~</span> <span class="ruby-identifier">step_4_re</span>
1019 283:         <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">r2</span> <span class="ruby-operator">=~</span> <span class="ruby-node">/#{$&amp;}/</span>
1020 284:           <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-node">/#{$&amp;}$/</span>, <span class="ruby-identifier">s4m</span>[<span class="ruby-node">$&amp;</span>])
1021 285:         <span class="ruby-keyword kw">else</span>
1022 286:           <span class="ruby-keyword kw">self</span>
1023 287:         <span class="ruby-keyword kw">end</span>
1024 288:       <span class="ruby-keyword kw">else</span>
1025 289:         <span class="ruby-keyword kw">self</span>
1026 290:       <span class="ruby-keyword kw">end</span>
1027 291:     <span class="ruby-keyword kw">end</span>
1028 292:   <span class="ruby-keyword kw">end</span></pre>
1029                                         </div>
1030
1031                                 </div>
1032
1033
1034
1035
1036                         </div>
1037
1038
1039                         <div id="step--method" class="method-detail ">
1040                                 <a name="method-i-step_5"></a>
1041
1042                                 <div class="method-heading">
1043
1044                                         <span class="method-name">step_5</span><span
1045                                                 class="method-args">()</span>
1046                                         <span class="method-click-advice">click to toggle source</span>
1047
1048                                 </div>
1049
1050                                 <div class="method-description">
1051
1052
1053
1054
1055
1056                                         <div class="method-source-code"
1057                                                 id="step--source">
1058 <pre>
1059      <span class="ruby-comment cmt"># File lib/porter2.rb, line 295</span>
1060 295:   <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">step_5</span>
1061 296:     <span class="ruby-keyword kw">if</span> <span class="ruby-keyword kw">self</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/ll$/</span> <span class="ruby-keyword kw">and</span> <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">porter2_r2</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/l$/</span>
1062 297:       <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-regexp re">/ll$/</span>, <span class="ruby-value str">'l'</span>)
1063 298:     <span class="ruby-keyword kw">elsif</span> <span class="ruby-keyword kw">self</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/e$/</span> <span class="ruby-keyword kw">and</span> <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">porter2_r2</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/e$/</span>
1064 299:       <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-regexp re">/e$/</span>, <span class="ruby-value str">''</span>)
1065 300:     <span class="ruby-keyword kw">else</span>
1066 301:       <span class="ruby-identifier">r1</span> = <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">porter2_r1</span>
1067 302:       <span class="ruby-keyword kw">if</span> <span class="ruby-keyword kw">self</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/e$/</span> <span class="ruby-keyword kw">and</span> <span class="ruby-identifier">r1</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/e$/</span> <span class="ruby-keyword kw">and</span> <span class="ruby-keyword kw">not</span> <span class="ruby-keyword kw">self</span> <span class="ruby-operator">=~</span> <span class="ruby-node">/#{SHORT_SYLLABLE}e$/</span>
1068 303:         <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-regexp re">/e$/</span>, <span class="ruby-value str">''</span>)
1069 304:       <span class="ruby-keyword kw">else</span>
1070 305:         <span class="ruby-keyword kw">self</span>
1071 306:       <span class="ruby-keyword kw">end</span>
1072 307:     <span class="ruby-keyword kw">end</span>
1073 308:   <span class="ruby-keyword kw">end</span></pre>
1074                                         </div>
1075
1076                                 </div>
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1081                         </div>
1082
1083
1084                 </div>
1085
1086
1087         </div>
1088
1089
1090         <div id="rdoc-debugging-section-dump" class="debugging-section">
1091
1092                 <p>Disabled; run with --debug to generate this.</p>
1093
1094         </div>
1095
1096         <div id="validator-badges">
1097                 <p><small><a href="http://validator.w3.org/check/referer">[Validate]</a></small></p>
1098                 <p><small>Generated with the <a href="http://deveiate.org/projects/Darkfish-Rdoc/">Darkfish
1099                         Rdoc Generator</a> 1.1.6</small>.</p>
1100         </div>
1101
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1103 </html>
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