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- <title>Module: Stemmable</title>
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- class="thickbox" title="lib/porter2.rb">lib/porter2.rb</a></li>
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- <h3 class="section-header">Methods</h3>
- <ul class="link-list">
-
- <li><a href="#method-i-porter2_ends_with_short_syllable%3F">#porter2_ends_with_short_syllable?</a></li>
-
- <li><a href="#method-i-porter2_is_short_word%3F">#porter2_is_short_word?</a></li>
-
- <li><a href="#method-i-porter2_postprocess">#porter2_postprocess</a></li>
-
- <li><a href="#method-i-porter2_preprocess">#porter2_preprocess</a></li>
-
- <li><a href="#method-i-porter2_r1">#porter2_r1</a></li>
-
- <li><a href="#method-i-porter2_r2">#porter2_r2</a></li>
-
- <li><a href="#method-i-porter2_stem">#porter2_stem</a></li>
-
- <li><a href="#method-i-porter2_stem_verbose">#porter2_stem_verbose</a></li>
-
- <li><a href="#method-i-porter2_tidy">#porter2_tidy</a></li>
-
- <li><a href="#method-i-stem">#stem</a></li>
-
- <li><a href="#method-i-step_0">#step_0</a></li>
-
- <li><a href="#method-i-step_1a">#step_1a</a></li>
-
- <li><a href="#method-i-step_1b">#step_1b</a></li>
-
- <li><a href="#method-i-step_1c">#step_1c</a></li>
-
- <li><a href="#method-i-step_2">#step_2</a></li>
-
- <li><a href="#method-i-step_3">#step_3</a></li>
-
- <li><a href="#method-i-step_4">#step_4</a></li>
-
- <li><a href="#method-i-step_5">#step_5</a></li>
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-
- <li><a href="./Stemmable.html">Stemmable</a></li>
-
- <li><a href="./String.html">String</a></li>
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- <div id="documentation">
- <h1 class="module">Stemmable</h1>
-
- <div id="description">
- <p>
-Porter stemmer in Ruby.\r
-</p>
-<p>
-This is the Porter 2 stemming algorithm, as described at
\r <a
-href="http://snowball.tartarus.org/algorithms/english/stemmer.html">snowball.tartarus.org/algorithms/english/stemmer.html</a>\r
-The original paper is:\r
-</p>
-<pre>
- Porter, 1980, An algorithm for suffix stripping, Program, Vol. 14,\r
- no. 3, pp 130-137\r</pre>
-
- </div>
-
- <!-- Constants -->
-
- <div id="constants-list" class="section">
- <h3 class="section-header">Constants</h3>
- <dl>
-
- <dt><a name="C">C</a></dt>
-
- <dd class="description"><p>
-A non-vowel\r
-</p></dd>
-
-
- <dt><a name="V">V</a></dt>
-
- <dd class="description"><p>
-A vowel\r
-</p></dd>
-
-
- <dt><a name="CW">CW</a></dt>
-
- <dd class="description"><p>
-A non-vowel other than w, x, or Y\r
-</p></dd>
-
-
- <dt><a name="Double">Double</a></dt>
-
- <dd class="description"><p>
-Doubles created when added a suffix: these are undoubled when stemmed\r
-</p></dd>
-
-
- <dt><a name="Valid_LI">Valid_LI</a></dt>
-
- <dd class="description"><p>
-A valid letter that can come before ‘li’\r
-</p></dd>
-
-
- <dt><a name="SHORT_SYLLABLE">SHORT_SYLLABLE</a></dt>
-
- <dd class="description"><p>
-A specification for a short syllable\r
-</p></dd>
-
-
- <dt><a name="STEP_2_MAPS">STEP_2_MAPS</a></dt>
-
- <dd class="description"><p>
-Suffix transformations used in Step 2.\r (ogi, li endings dealt with in
-procedure)\r
-</p></dd>
-
-
- <dt><a name="STEP_3_MAPS">STEP_3_MAPS</a></dt>
-
- <dd class="description"><p>
-Suffix transformations used in Step 3.\r (ative ending dealt with in
-procedure) \r
-</p></dd>
-
-
- <dt><a name="STEP_4_MAPS">STEP_4_MAPS</a></dt>
-
- <dd class="description"><p>
-Suffix transformations used in Step 4.\r
-</p></dd>
-
-
- <dt><a name="SPECIAL_CASES">SPECIAL_CASES</a></dt>
-
- <dd class="description"><p>
-Special-case stemmings \r
-</p></dd>
-
-
- <dt><a name="STEP_1A_SPECIAL_CASES">STEP_1A_SPECIAL_CASES</a></dt>
-
- <dd class="description"><p>
-Special case words to ignore after step 1a.\r
-</p></dd>
-
-
- </dl>
- </div>
-
-
- <!-- Attributes -->
-
-
- <!-- Methods -->
-
- <div id="public-instance-method-details" class="method-section section">
- <h3 class="section-header">Public Instance Methods</h3>
-
-
- <div id="porter-ends-with-short-syllable--method" class="method-detail ">
- <a name="method-i-porter2_ends_with_short_syllable%3F"></a>
-
- <div class="method-heading">
-
- <span class="method-name">porter2_ends_with_short_syllable?</span><span
- class="method-args">()</span>
- <span class="method-click-advice">click to toggle source</span>
-
- </div>
-
- <div class="method-description">
-
- <p>
-A short syllable in a word is either \r
-</p>
-<ol>
-<li><p>
-a vowel followed by a non-vowel other than w, x or Y and preceded by \r
-</p>
-</li>
-</ol>
-<p>
-a non-vowel, or \r
-</p>
-<ol>
-<li><p>
-a vowel at the beginning of the word followed by a non-vowel. \r
-</p>
-</li>
-</ol>
-
-
-
- <div class="method-source-code"
- id="porter-ends-with-short-syllable--source">
-<pre>
- <span class="ruby-comment cmt"># File lib/porter2.rb, line 155</span>
-155: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">porter2_ends_with_short_syllable?</span>\r
-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>\r
-157: <span class="ruby-keyword kw">end</span></pre>
- </div>
-
- </div>
-
-
-
-
- </div>
-
-
- <div id="porter-is-short-word--method" class="method-detail ">
- <a name="method-i-porter2_is_short_word%3F"></a>
-
- <div class="method-heading">
-
- <span class="method-name">porter2_is_short_word?</span><span
- class="method-args">()</span>
- <span class="method-click-advice">click to toggle source</span>
-
- </div>
-
- <div class="method-description">
-
- <p>
-A word is short if it ends in a short syllable, and if R1 is null\r
-</p>
-
-
-
- <div class="method-source-code"
- id="porter-is-short-word--source">
-<pre>
- <span class="ruby-comment cmt"># File lib/porter2.rb, line 160</span>
-160: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">porter2_is_short_word?</span>\r
-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>\r
-162: <span class="ruby-keyword kw">end</span></pre>
- </div>
-
- </div>
-
-
-
-
- </div>
-
-
- <div id="porter-postprocess-method" class="method-detail ">
- <a name="method-i-porter2_postprocess"></a>
-
- <div class="method-heading">
-
- <span class="method-name">porter2_postprocess</span><span
- class="method-args">()</span>
- <span class="method-click-advice">click to toggle source</span>
-
- </div>
-
- <div class="method-description">
-
-
-
-
-
- <div class="method-source-code"
- id="porter-postprocess-source">
-<pre>
- <span class="ruby-comment cmt"># File lib/porter2.rb, line 311</span>
-311: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">porter2_postprocess</span>\r
-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>)\r
-313: <span class="ruby-keyword kw">end</span></pre>
- </div>
-
- </div>
-
-
-
-
- </div>
-
-
- <div id="porter-preprocess-method" class="method-detail ">
- <a name="method-i-porter2_preprocess"></a>
-
- <div class="method-heading">
-
- <span class="method-name">porter2_preprocess</span><span
- class="method-args">()</span>
- <span class="method-click-advice">click to toggle source</span>
-
- </div>
-
- <div class="method-description">
-
-
-
-
-
- <div class="method-source-code"
- id="porter-preprocess-source">
-<pre>
- <span class="ruby-comment cmt"># File lib/porter2.rb, line 122</span>
-122: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">porter2_preprocess</span> \r
-123: <span class="ruby-identifier">w</span> = <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">dup</span>\r
-124: \r
-125: <span class="ruby-comment cmt"># remove any initial apostrophe\r</span>
-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>)\r
-127: \r
-128: <span class="ruby-comment cmt"># set initial y, or y after a vowel, to Y\r</span>
-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">"Y"</span>)\r
-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>)\r
-131: \r
-132: <span class="ruby-identifier">w</span>\r
-133: <span class="ruby-keyword kw">end</span></pre>
- </div>
-
- </div>
-
-
-
-
- </div>
-
-
- <div id="porter-r--method" class="method-detail ">
- <a name="method-i-porter2_r1"></a>
-
- <div class="method-heading">
-
- <span class="method-name">porter2_r1</span><span
- class="method-args">()</span>
- <span class="method-click-advice">click to toggle source</span>
-
- </div>
-
- <div class="method-description">
-
- <p>
-The word after the first non-vowel after the first vowel\r
-</p>
-
-
-
- <div class="method-source-code"
- id="porter-r--source">
-<pre>
- <span class="ruby-comment cmt"># File lib/porter2.rb, line 136</span>
-136: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">porter2_r1</span>\r
-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)(?<r1>.*)/</span>\r
-138: <span class="ruby-constant">Regexp</span>.<span class="ruby-identifier">last_match</span>(<span class="ruby-value">:r1</span>)\r
-139: <span class="ruby-keyword kw">else</span>\r
-140: <span class="ruby-keyword kw">self</span> <span class="ruby-operator">=~</span> <span class="ruby-node">/#{V}#{C}(?<r1>.*)$/</span>\r
-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">""</span>\r
-142: <span class="ruby-keyword kw">end</span>\r
-143: <span class="ruby-keyword kw">end</span></pre>
- </div>
-
- </div>
-
-
-
-
- </div>
-
-
- <div id="porter-r--method" class="method-detail ">
- <a name="method-i-porter2_r2"></a>
-
- <div class="method-heading">
-
- <span class="method-name">porter2_r2</span><span
- class="method-args">()</span>
- <span class="method-click-advice">click to toggle source</span>
-
- </div>
-
- <div class="method-description">
-
- <p>
-R1 after the first non-vowel after the first vowel\r
-</p>
-
-
-
- <div class="method-source-code"
- id="porter-r--source">
-<pre>
- <span class="ruby-comment cmt"># File lib/porter2.rb, line 146</span>
-146: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">porter2_r2</span>\r
-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}(?<r2>.*)$/</span>\r
-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">""</span>\r
-149: <span class="ruby-keyword kw">end</span></pre>
- </div>
-
- </div>
-
-
-
-
- </div>
-
-
- <div id="porter-stem-method" class="method-detail ">
- <a name="method-i-porter2_stem"></a>
-
- <div class="method-heading">
-
- <span class="method-name">porter2_stem</span><span
- class="method-args">(gb_english = false)</span>
- <span class="method-click-advice">click to toggle source</span>
-
- </div>
-
- <div class="method-description">
-
-
-
-
-
- <div class="method-source-code"
- id="porter-stem-source">
-<pre>
- <span class="ruby-comment cmt"># File lib/porter2.rb, line 316</span>
-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>)\r
-317: <span class="ruby-identifier">preword</span> = <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">porter2_tidy</span>\r
-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"><=</span> <span class="ruby-value">2</span>\r
-319: \r
-320: <span class="ruby-identifier">word</span> = <span class="ruby-identifier">preword</span>.<span class="ruby-identifier">porter2_preprocess</span>\r
-321: \r
-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>\r
-323: <span class="ruby-constant">SPECIAL_CASES</span>[<span class="ruby-identifier">word</span>]\r
-324: <span class="ruby-keyword kw">else</span>\r
-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>\r
-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> \r
-327: <span class="ruby-identifier">w1a</span>\r
-328: <span class="ruby-keyword kw">else</span>\r
-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>\r
-330: <span class="ruby-keyword kw">end</span>\r
-331: <span class="ruby-keyword kw">end</span>\r
-332: <span class="ruby-keyword kw">end</span></pre>
- </div>
-
- </div>
-
-
- <div class="aliases">
- Also aliased as: <a href="Stemmable.html#method-i-stem">stem</a>
- </div>
-
-
-
- </div>
-
-
- <div id="porter-stem-verbose-method" class="method-detail ">
- <a name="method-i-porter2_stem_verbose"></a>
-
- <div class="method-heading">
-
- <span class="method-name">porter2_stem_verbose</span><span
- class="method-args">(gb_english = false)</span>
- <span class="method-click-advice">click to toggle source</span>
-
- </div>
-
- <div class="method-description">
-
-
-
-
-
- <div class="method-source-code"
- id="porter-stem-verbose-source">
-<pre>
- <span class="ruby-comment cmt"># File lib/porter2.rb, line 334</span>
-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>)\r
-335: <span class="ruby-identifier">preword</span> = <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">porter2_tidy</span>\r
-336: <span class="ruby-identifier">puts</span> <span class="ruby-node">"Preword: #{preword}"</span>\r
-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"><=</span> <span class="ruby-value">2</span>\r
-338: \r
-339: <span class="ruby-identifier">word</span> = <span class="ruby-identifier">preword</span>.<span class="ruby-identifier">porter2_preprocess</span>\r
-340: <span class="ruby-identifier">puts</span> <span class="ruby-node">"Preprocessed: #{word}"</span>\r
-341: \r
-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>\r
-343: <span class="ruby-identifier">puts</span> <span class="ruby-node">"Returning #{word} as special case #{SPECIAL_CASES[word]}"</span>\r
-344: <span class="ruby-constant">SPECIAL_CASES</span>[<span class="ruby-identifier">word</span>]\r
-345: <span class="ruby-keyword kw">else</span>\r
-346: <span class="ruby-identifier">r1</span> = <span class="ruby-identifier">word</span>.<span class="ruby-identifier">porter2_r1</span>\r
-347: <span class="ruby-identifier">r2</span> = <span class="ruby-identifier">word</span>.<span class="ruby-identifier">porter2_r2</span>\r
-348: <span class="ruby-identifier">puts</span> <span class="ruby-node">"R1 = #{r1}, R2 = #{r2}"</span>\r
-349: \r
-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">"After step 0: #{w0} (R1 = #{w0.porter2_r1}, R2 = #{w0.porter2_r2})"</span>\r
-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">"After step 1a: #{w1a} (R1 = #{w1a.porter2_r1}, R2 = #{w1a.porter2_r2})"</span>\r
-352: \r
-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>\r
-354: <span class="ruby-identifier">puts</span> <span class="ruby-node">"Returning #{w1a} as 1a special case"</span>\r
-355: <span class="ruby-identifier">w1a</span>\r
-356: <span class="ruby-keyword kw">else</span>\r
-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">"After step 1b: #{w1b} (R1 = #{w1b.porter2_r1}, R2 = #{w1b.porter2_r2})"</span>\r
-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">"After step 1c: #{w1c} (R1 = #{w1c.porter2_r1}, R2 = #{w1c.porter2_r2})"</span>\r
-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">"After step 2: #{w2} (R1 = #{w2.porter2_r1}, R2 = #{w2.porter2_r2})"</span>\r
-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">"After step 3: #{w3} (R1 = #{w3.porter2_r1}, R2 = #{w3.porter2_r2})"</span>\r
-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">"After step 4: #{w4} (R1 = #{w4.porter2_r1}, R2 = #{w4.porter2_r2})"</span>\r
-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">"After step 5: #{w5}"</span>\r
-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">"After postprocess: #{wpost}"</span>\r
-364: <span class="ruby-identifier">wpost</span>\r
-365: <span class="ruby-keyword kw">end</span>\r
-366: <span class="ruby-keyword kw">end</span>\r
-367: <span class="ruby-keyword kw">end</span></pre>
- </div>
-
- </div>
-
-
-
-
- </div>
-
-
- <div id="porter-tidy-method" class="method-detail ">
- <a name="method-i-porter2_tidy"></a>
-
- <div class="method-heading">
-
- <span class="method-name">porter2_tidy</span><span
- class="method-args">()</span>
- <span class="method-click-advice">click to toggle source</span>
-
- </div>
-
- <div class="method-description">
-
- <p>
-Tidy up the word before we get down to the algorithm\r
-</p>
-
-
-
- <div class="method-source-code"
- id="porter-tidy-source">
-<pre>
- <span class="ruby-comment cmt"># File lib/porter2.rb, line 112</span>
-112: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">porter2_tidy</span>\r
-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>\r
-114: \r
-115: <span class="ruby-comment cmt"># map apostrophe-like characters to apostrophes\r</span>
-116: <span class="ruby-identifier">preword</span>.<span class="ruby-identifier">gsub!</span>(<span class="ruby-regexp re">/‘/</span>, <span class="ruby-value str">"'"</span>)\r
-117: <span class="ruby-identifier">preword</span>.<span class="ruby-identifier">gsub!</span>(<span class="ruby-regexp re">/’/</span>, <span class="ruby-value str">"'"</span>)\r
-118: \r
-119: <span class="ruby-identifier">preword</span>\r
-120: <span class="ruby-keyword kw">end</span></pre>
- </div>
-
- </div>
-
-
-
-
- </div>
-
-
- <div id="stem-method" class="method-detail method-alias">
- <a name="method-i-stem"></a>
-
- <div class="method-heading">
-
- <span class="method-name">stem</span><span
- class="method-args">(gb_english = false)</span>
- <span class="method-click-advice">click to toggle source</span>
-
- </div>
-
- <div class="method-description">
-
-
-
-
-
- </div>
-
-
-
-
- <div class="aliases">
- Alias for: <a href="Stemmable.html#method-i-porter2_stem">porter2_stem</a>
- </div>
-
- </div>
-
-
- <div id="step--method" class="method-detail ">
- <a name="method-i-step_0"></a>
-
- <div class="method-heading">
-
- <span class="method-name">step_0</span><span
- class="method-args">()</span>
- <span class="method-click-advice">click to toggle source</span>
-
- </div>
-
- <div class="method-description">
-
- <p>
-Search for the longest among the suffixes, \r
-</p>
-<ul>
-<li><p>
-’\r
-</p>
-</li>
-<li><p>
-’s\r
-</p>
-</li>
-<li><p>
-’s’\r
-</p>
-</li>
-</ul>
-<p>
-and remove if found.\r
-</p>
-
-
-
- <div class="method-source-code"
- id="step--source">
-<pre>
- <span class="ruby-comment cmt"># File lib/porter2.rb, line 169</span>
-169: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">step_0</span>\r
-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>\r
-171: <span class="ruby-keyword kw">end</span></pre>
- </div>
-
- </div>
-
-
-
-
- </div>
-
-
- <div id="step-a-method" class="method-detail ">
- <a name="method-i-step_1a"></a>
-
- <div class="method-heading">
-
- <span class="method-name">step_1a</span><span
- class="method-args">()</span>
- <span class="method-click-advice">click to toggle source</span>
-
- </div>
-
- <div class="method-description">
-
- <p>
-Remove plural suffixes\r
-</p>
-
-
-
- <div class="method-source-code"
- id="step-a-source">
-<pre>
- <span class="ruby-comment cmt"># File lib/porter2.rb, line 174</span>
-174: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">step_1a</span>\r
-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$/</span>\r
-176: <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-regexp re">/sses$/</span>, <span class="ruby-value str">'ss'</span>)\r
-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)$/</span>\r
-178: <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-regexp re">/(ied|ies)$/</span>, <span class="ruby-value str">'i'</span>)\r
-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)$/</span>\r
-180: <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-regexp re">/(ied|ies)$/</span>, <span class="ruby-value str">'ie'</span>)\r
-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)$/</span>\r
-182: <span class="ruby-keyword kw">self</span>\r
-183: <span class="ruby-keyword kw">elsif</span> <span class="ruby-keyword kw">self</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/s$/</span>\r
-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$/</span>\r
-185: <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-regexp re">/s$/</span>, <span class="ruby-value str">''</span>) \r
-186: <span class="ruby-keyword kw">else</span>\r
-187: <span class="ruby-keyword kw">self</span>\r
-188: <span class="ruby-keyword kw">end</span>\r
-189: <span class="ruby-keyword kw">else</span>\r
-190: <span class="ruby-keyword kw">self</span>\r
-191: <span class="ruby-keyword kw">end</span>\r
-192: <span class="ruby-keyword kw">end</span></pre>
- </div>
-
- </div>
-
-
-
-
- </div>
-
-
- <div id="step-b-method" class="method-detail ">
- <a name="method-i-step_1b"></a>
-
- <div class="method-heading">
-
- <span class="method-name">step_1b</span><span
- class="method-args">(gb_english = false)</span>
- <span class="method-click-advice">click to toggle source</span>
-
- </div>
-
- <div class="method-description">
-
-
-
-
-
- <div class="method-source-code"
- id="step-b-source">
-<pre>
- <span class="ruby-comment cmt"># File lib/porter2.rb, line 194</span>
-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>)\r
-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)$/</span>\r
-196: <span class="ruby-keyword kw">if</span> <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">porter2_r1</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/(eed|eedly)$/</span>\r
-197: <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-regexp re">/(eed|eedly)$/</span>, <span class="ruby-value str">'ee'</span>)\r
-198: <span class="ruby-keyword kw">else</span>\r
-199: <span class="ruby-keyword kw">self</span>\r
-200: <span class="ruby-keyword kw">end</span>\r
-201: <span class="ruby-keyword kw">else</span>\r
-202: <span class="ruby-identifier">w</span> = <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">dup</span>\r
-203: <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">w</span> <span class="ruby-operator">=~</span> <span class="ruby-node">/#{V}.*(ed|edly|ing|ingly)$/</span>\r
-204: <span class="ruby-identifier">w</span>.<span class="ruby-identifier">sub!</span>(<span class="ruby-regexp re">/(ed|edly|ing|ingly)$/</span>, <span class="ruby-value str">''</span>)\r
-205: <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">w</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/(at|lb|iz)$/</span>\r
-206: <span class="ruby-identifier">w</span> <span class="ruby-operator">+=</span> <span class="ruby-value str">'e'</span> \r
-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$/</span> <span class="ruby-keyword kw">and</span> <span class="ruby-identifier">gb_english</span>\r
-208: <span class="ruby-identifier">w</span> <span class="ruby-operator">+=</span> <span class="ruby-value str">'e'</span> \r
-209: <span class="ruby-keyword kw">elsif</span> <span class="ruby-identifier">w</span> <span class="ruby-operator">=~</span> <span class="ruby-node">/#{Double}$/</span>\r
-210: <span class="ruby-identifier">w</span>.<span class="ruby-identifier">chop!</span>\r
-211: <span class="ruby-keyword kw">elsif</span> <span class="ruby-identifier">w</span>.<span class="ruby-identifier">porter2_is_short_word?</span>\r
-212: <span class="ruby-identifier">w</span> <span class="ruby-operator">+=</span> <span class="ruby-value str">'e'</span>\r
-213: <span class="ruby-keyword kw">end</span>\r
-214: <span class="ruby-keyword kw">end</span>\r
-215: <span class="ruby-identifier">w</span>\r
-216: <span class="ruby-keyword kw">end</span>\r
-217: <span class="ruby-keyword kw">end</span></pre>
- </div>
-
- </div>
-
-
-
-
- </div>
-
-
- <div id="step-c-method" class="method-detail ">
- <a name="method-i-step_1c"></a>
-
- <div class="method-heading">
-
- <span class="method-name">step_1c</span><span
- class="method-args">()</span>
- <span class="method-click-advice">click to toggle source</span>
-
- </div>
-
- <div class="method-description">
-
-
-
-
-
- <div class="method-source-code"
- id="step-c-source">
-<pre>
- <span class="ruby-comment cmt"># File lib/porter2.rb, line 220</span>
-220: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">step_1c</span>\r
-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)$/</span>\r
-222: <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-regexp re">/(y|Y)$/</span>, <span class="ruby-value str">'i'</span>)\r
-223: <span class="ruby-keyword kw">else</span>\r
-224: <span class="ruby-keyword kw">self</span>\r
-225: <span class="ruby-keyword kw">end</span>\r
-226: <span class="ruby-keyword kw">end</span></pre>
- </div>
-
- </div>
-
-
-
-
- </div>
-
-
- <div id="step--method" class="method-detail ">
- <a name="method-i-step_2"></a>
-
- <div class="method-heading">
-
- <span class="method-name">step_2</span><span
- class="method-args">(gb_english = false)</span>
- <span class="method-click-advice">click to toggle source</span>
-
- </div>
-
- <div class="method-description">
-
-
-
-
-
- <div class="method-source-code"
- id="step--source">
-<pre>
- <span class="ruby-comment cmt"># File lib/porter2.rb, line 229</span>
-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>)\r
-230: <span class="ruby-identifier">r1</span> = <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">porter2_r1</span>\r
-231: <span class="ruby-identifier">s2m</span> = <span class="ruby-constant">STEP_2_MAPS</span>.<span class="ruby-identifier">dup</span>\r
-232: <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">gb_english</span>\r
-233: <span class="ruby-identifier">s2m</span>[<span class="ruby-value str">"iser"</span>] = <span class="ruby-value str">"ise"</span>\r
-234: <span class="ruby-identifier">s2m</span>[<span class="ruby-value str">"isation"</span>] = <span class="ruby-value str">"ise"</span>\r
-235: <span class="ruby-keyword kw">end</span>\r
-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">"$"</span>)})\r
-237: <span class="ruby-keyword kw">if</span> <span class="ruby-keyword kw">self</span> <span class="ruby-operator">=~</span> <span class="ruby-identifier">step_2_re</span>\r
-238: <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">r1</span> <span class="ruby-operator">=~</span> <span class="ruby-node">/#{$&}$/</span>\r
-239: <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-node">/#{$&}$/</span>, <span class="ruby-identifier">s2m</span>[<span class="ruby-node">$&</span>])\r
-240: <span class="ruby-keyword kw">else</span>\r
-241: <span class="ruby-keyword kw">self</span>\r
-242: <span class="ruby-keyword kw">end</span>\r
-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>\r
-244: <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-regexp re">/li$/</span>, <span class="ruby-value str">''</span>)\r
-245: <span class="ruby-keyword kw">elsif</span> <span class="ruby-identifier">r1</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/ogi$/</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$/</span>\r
-246: <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-regexp re">/ogi$/</span>, <span class="ruby-value str">'og'</span>)\r
-247: <span class="ruby-keyword kw">else</span>\r
-248: <span class="ruby-keyword kw">self</span>\r
-249: <span class="ruby-keyword kw">end</span>\r
-250: <span class="ruby-keyword kw">end</span></pre>
- </div>
-
- </div>
-
-
-
-
- </div>
-
-
- <div id="step--method" class="method-detail ">
- <a name="method-i-step_3"></a>
-
- <div class="method-heading">
-
- <span class="method-name">step_3</span><span
- class="method-args">(gb_english = false)</span>
- <span class="method-click-advice">click to toggle source</span>
-
- </div>
-
- <div class="method-description">
-
-
-
-
-
- <div class="method-source-code"
- id="step--source">
-<pre>
- <span class="ruby-comment cmt"># File lib/porter2.rb, line 253</span>
-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>)\r
-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>\r
-255: <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-regexp re">/ative$/</span>, <span class="ruby-value str">''</span>)\r
-256: <span class="ruby-keyword kw">else</span>\r
-257: <span class="ruby-identifier">s3m</span> = <span class="ruby-constant">STEP_3_MAPS</span>.<span class="ruby-identifier">dup</span>\r
-258: <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">gb_english</span>\r
-259: <span class="ruby-identifier">s3m</span>[<span class="ruby-value str">"alise"</span>] = <span class="ruby-value str">"al"</span>\r
-260: <span class="ruby-keyword kw">end</span>\r
-261: <span class="ruby-identifier">step_3_re</span> = <span class="ruby-constant">Regexp</span>.<span class="ruby-identifier">union</span>(<span class="ruby-identifier">s3m</span>.<span class="ruby-identifier">keys</span>.<span class="ruby-identifier">map</span> {<span class="ruby-operator">|</span><span class="ruby-identifier">r</span><span class="ruby-operator">|</span> <span class="ruby-constant">Regexp</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">r</span> <span class="ruby-operator">+</span> <span class="ruby-value str">"$"</span>)})\r
-262: <span class="ruby-identifier">r1</span> = <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">porter2_r1</span>\r
-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">/#{$&}$/</span> \r
-264: <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-node">/#{$&}$/</span>, <span class="ruby-identifier">s3m</span>[<span class="ruby-node">$&</span>])\r
-265: <span class="ruby-keyword kw">else</span>\r
-266: <span class="ruby-keyword kw">self</span>\r
-267: <span class="ruby-keyword kw">end</span>\r
-268: <span class="ruby-keyword kw">end</span>\r
-269: <span class="ruby-keyword kw">end</span></pre>
- </div>
-
- </div>
-
-
-
-
- </div>
-
-
- <div id="step--method" class="method-detail ">
- <a name="method-i-step_4"></a>
-
- <div class="method-heading">
-
- <span class="method-name">step_4</span><span
- class="method-args">(gb_english = false)</span>
- <span class="method-click-advice">click to toggle source</span>
-
- </div>
-
- <div class="method-description">
-
-
-
-
-
- <div class="method-source-code"
- id="step--source">
-<pre>
- <span class="ruby-comment cmt"># File lib/porter2.rb, line 272</span>
-272: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">step_4</span>(<span class="ruby-identifier">gb_english</span> = <span class="ruby-keyword kw">false</span>)\r
-273: <span class="ruby-keyword kw">if</span> <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">porter2_r2</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/ion$/</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$/</span>\r
-274: <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-regexp re">/ion$/</span>, <span class="ruby-value str">''</span>)\r
-275: <span class="ruby-keyword kw">else</span>\r
-276: <span class="ruby-identifier">s4m</span> = <span class="ruby-constant">STEP_4_MAPS</span>.<span class="ruby-identifier">dup</span>\r
-277: <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">gb_english</span>\r
-278: <span class="ruby-identifier">s4m</span>[<span class="ruby-value str">"ise"</span>] = <span class="ruby-value str">""</span>\r
-279: <span class="ruby-keyword kw">end</span>\r
-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">"$"</span>)})\r
-281: <span class="ruby-identifier">r2</span> = <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">porter2_r2</span>\r
-282: <span class="ruby-keyword kw">if</span> <span class="ruby-keyword kw">self</span> <span class="ruby-operator">=~</span> <span class="ruby-identifier">step_4_re</span>\r
-283: <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">r2</span> <span class="ruby-operator">=~</span> <span class="ruby-node">/#{$&}/</span>\r
-284: <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-node">/#{$&}$/</span>, <span class="ruby-identifier">s4m</span>[<span class="ruby-node">$&</span>])\r
-285: <span class="ruby-keyword kw">else</span>\r
-286: <span class="ruby-keyword kw">self</span>\r
-287: <span class="ruby-keyword kw">end</span>\r
-288: <span class="ruby-keyword kw">else</span>\r
-289: <span class="ruby-keyword kw">self</span>\r
-290: <span class="ruby-keyword kw">end</span>\r
-291: <span class="ruby-keyword kw">end</span>\r
-292: <span class="ruby-keyword kw">end</span></pre>
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- <div id="step--method" class="method-detail ">
- <a name="method-i-step_5"></a>
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- <div class="method-heading">
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- <span class="method-name">step_5</span><span
- class="method-args">()</span>
- <span class="method-click-advice">click to toggle source</span>
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- id="step--source">
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- <span class="ruby-comment cmt"># File lib/porter2.rb, line 295</span>
-295: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">step_5</span>\r
-296: <span class="ruby-keyword kw">if</span> <span class="ruby-keyword kw">self</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/ll$/</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$/</span>\r
-297: <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-regexp re">/ll$/</span>, <span class="ruby-value str">'l'</span>) \r
-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> \r
-299: <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-regexp re">/e$/</span>, <span class="ruby-value str">''</span>) \r
-300: <span class="ruby-keyword kw">else</span>\r
-301: <span class="ruby-identifier">r1</span> = <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">porter2_r1</span>\r
-302: <span class="ruby-keyword kw">if</span> <span class="ruby-keyword kw">self</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp re">/e$/</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>\r
-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>)\r
-304: <span class="ruby-keyword kw">else</span>\r
-305: <span class="ruby-keyword kw">self</span>\r
-306: <span class="ruby-keyword kw">end</span>\r
-307: <span class="ruby-keyword kw">end</span>\r
-308: <span class="ruby-keyword kw">end</span></pre>
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- <p>Disabled; run with --debug to generate this.</p>
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projects / porter2stemmer.git / blobdiff