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| <a href="_jaro_winkler_distance_8cs.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*</span></div> |
| <div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * Licensed to the Apache Software Foundation (ASF) under one or more</span></div> |
| <div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * contributor license agreements. See the NOTICE file distributed with</span></div> |
| <div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * this work for additional information regarding copyright ownership.</span></div> |
| <div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * The ASF licenses this file to You under the Apache License, Version 2.0</span></div> |
| <div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * (the "License"); you may not use this file except in compliance with</span></div> |
| <div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * the License. You may obtain a copy of the License at</span></div> |
| <div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> *</span></div> |
| <div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * http://www.apache.org/licenses/LICENSE-2.0</span></div> |
| <div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> *</span></div> |
| <div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * Unless required by applicable law or agreed to in writing, software</span></div> |
| <div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * distributed under the License is distributed on an "AS IS" BASIS,</span></div> |
| <div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div> |
| <div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * See the License for the specific language governing permissions and</span></div> |
| <div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * limitations under the License.</span></div> |
| <div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> */</span></div> |
| <div class="line"><a name="l00017"></a><span class="lineno"> 17</span> </div> |
| <div class="line"><a name="l00018"></a><span class="lineno"> 18</span> </div> |
| <div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="keyword">using</span> System.Linq;</div> |
| <div class="line"><a name="l00020"></a><span class="lineno"> 20</span> </div> |
| <div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="keyword">namespace </span>SpellChecker.Net.Search.Spell</div> |
| <div class="line"><a name="l00022"></a><span class="lineno"> 22</span> {</div> |
| <div class="line"><a name="l00023"></a><span class="lineno"> 23</span> </div> |
| <div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  <span class="keyword">using</span> System;</div> |
| <div class="line"><a name="l00025"></a><span class="lineno"> 25</span> </div> |
| <div class="line"><a name="l00026"></a><span class="lineno"><a class="code" href="class_spell_checker_1_1_net_1_1_search_1_1_spell_1_1_jaro_winkler_distance.html"> 26</a></span>  <span class="keyword">public</span> <span class="keyword">class </span><a class="code" href="class_spell_checker_1_1_net_1_1_search_1_1_spell_1_1_jaro_winkler_distance.html">JaroWinklerDistance</a> : <a class="code" href="interface_spell_checker_1_1_net_1_1_search_1_1_spell_1_1_string_distance.html" title="Interface for string distances. ">StringDistance</a></div> |
| <div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  {</div> |
| <div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  <span class="keyword">private</span> <span class="keywordtype">float</span> threshold = 0.7f;</div> |
| <div class="line"><a name="l00029"></a><span class="lineno"> 29</span> </div> |
| <div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <span class="keyword">private</span> <span class="keyword">static</span> <span class="keywordtype">int</span>[] Matches(String s1, String s2)</div> |
| <div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  {</div> |
| <div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  String Max, Min;</div> |
| <div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  </div> |
| <div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keywordflow">if</span> (s1.Length > s2.Length)</div> |
| <div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  {</div> |
| <div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  Max = s1;</div> |
| <div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  Min = s2;</div> |
| <div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  }</div> |
| <div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keywordflow">else</span></div> |
| <div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  {</div> |
| <div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  Max = s2;</div> |
| <div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  Min = s1;</div> |
| <div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  }</div> |
| <div class="line"><a name="l00044"></a><span class="lineno"> 44</span> </div> |
| <div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  var range = Math.Max(Max.Length / 2 - 1, 0);</div> |
| <div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  var matchIndexes = <span class="keyword">new</span> <span class="keywordtype">int</span>[Min.Length];</div> |
| <div class="line"><a name="l00047"></a><span class="lineno"> 47</span> </div> |
| <div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keywordflow">for</span> (var i = 0; i < matchIndexes.Length; i++)</div> |
| <div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  matchIndexes[i] = -1;</div> |
| <div class="line"><a name="l00050"></a><span class="lineno"> 50</span> </div> |
| <div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  var matchFlags = <span class="keyword">new</span> <span class="keywordtype">bool</span>[Max.Length];</div> |
| <div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  var matches = 0;</div> |
| <div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  </div> |
| <div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keywordflow">for</span> (var mi = 0; mi < Min.Length; mi++)</div> |
| <div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  {</div> |
| <div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  var c1 = Min[mi];</div> |
| <div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> xi = Math.Max(mi - range, 0), </div> |
| <div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  xn = Math.Min(mi + range + 1, Max.Length); xi < xn; xi++)</div> |
| <div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  {</div> |
| <div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keywordflow">if</span> (matchFlags[xi] || c1 != Max[xi]) <span class="keywordflow">continue</span>;</div> |
| <div class="line"><a name="l00061"></a><span class="lineno"> 61</span> </div> |
| <div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  matchIndexes[mi] = xi;</div> |
| <div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  matchFlags[xi] = <span class="keyword">true</span>;</div> |
| <div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  matches++;</div> |
| <div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keywordflow">break</span>;</div> |
| <div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  }</div> |
| <div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  }</div> |
| <div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  </div> |
| <div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  var ms1 = <span class="keyword">new</span> <span class="keywordtype">char</span>[matches];</div> |
| <div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  var ms2 = <span class="keyword">new</span> <span class="keywordtype">char</span>[matches];</div> |
| <div class="line"><a name="l00071"></a><span class="lineno"> 71</span> </div> |
| <div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0, si = 0; i < Min.Length; i++)</div> |
| <div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  {</div> |
| <div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keywordflow">if</span> (matchIndexes[i] != -1)</div> |
| <div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  {</div> |
| <div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  ms1[si] = Min[i];</div> |
| <div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  si++;</div> |
| <div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  }</div> |
| <div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  }</div> |
| <div class="line"><a name="l00080"></a><span class="lineno"> 80</span> </div> |
| <div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0, si = 0; i < Max.Length; i++)</div> |
| <div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  {</div> |
| <div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keywordflow">if</span> (matchFlags[i])</div> |
| <div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  {</div> |
| <div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  ms2[si] = Max[i];</div> |
| <div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  si++;</div> |
| <div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  }</div> |
| <div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  }</div> |
| <div class="line"><a name="l00089"></a><span class="lineno"> 89</span> </div> |
| <div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  var transpositions = ms1.Where((t, mi) => t != ms2[mi]).Count();</div> |
| <div class="line"><a name="l00091"></a><span class="lineno"> 91</span> </div> |
| <div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  var prefix = 0;</div> |
| <div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keywordflow">for</span> (var mi = 0; mi < Min.Length; mi++)</div> |
| <div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  {</div> |
| <div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keywordflow">if</span> (s1[mi] == s2[mi])</div> |
| <div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  {</div> |
| <div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  prefix++;</div> |
| <div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  }</div> |
| <div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="keywordflow">else</span></div> |
| <div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  {</div> |
| <div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keywordflow">break</span>;</div> |
| <div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  }</div> |
| <div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  }</div> |
| <div class="line"><a name="l00104"></a><span class="lineno"> 104</span> </div> |
| <div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="keywordflow">return</span> <span class="keyword">new</span> <span class="keywordtype">int</span>[] { matches, transpositions / 2, prefix, Max.Length };</div> |
| <div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  }</div> |
| <div class="line"><a name="l00107"></a><span class="lineno"> 107</span> </div> |
| <div class="line"><a name="l00108"></a><span class="lineno"><a class="code" href="class_spell_checker_1_1_net_1_1_search_1_1_spell_1_1_jaro_winkler_distance.html#a3930167032f3c2265e9ff2181c8771cd"> 108</a></span>  <span class="keyword">public</span> <span class="keywordtype">float</span> GetDistance(String s1, String s2)</div> |
| <div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  {</div> |
| <div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  var mtp = Matches(s1, s2);</div> |
| <div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  var m = (float)mtp[0];</div> |
| <div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  </div> |
| <div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="keywordflow">if</span> (m == 0)</div> |
| <div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="keywordflow">return</span> 0f;</div> |
| <div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  </div> |
| <div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keywordtype">float</span> j = ((m / s1.Length + m / s2.Length + (m - mtp[1]) / m)) / 3;</div> |
| <div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="keywordtype">float</span> jw = j < Threshold ? j : j + Math.Min(0.1f, 1f / mtp[3]) * mtp[2] * (1 - j);</div> |
| <div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="keywordflow">return</span> jw;</div> |
| <div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  }</div> |
| <div class="line"><a name="l00120"></a><span class="lineno"> 120</span> </div> |
| <div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keyword">public</span> <span class="keywordtype">float</span> Threshold</div> |
| <div class="line"><a name="l00126"></a><span class="lineno"><a class="code" href="class_spell_checker_1_1_net_1_1_search_1_1_spell_1_1_jaro_winkler_distance.html#a6099307c93d1919f2b4018979d91a12b"> 126</a></span>  {</div> |
| <div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="keyword">get</span> { <span class="keywordflow">return</span> threshold; }</div> |
| <div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="keyword">set</span> { this.threshold = value; }</div> |
| <div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  }</div> |
| <div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  }</div> |
| <div class="line"><a name="l00131"></a><span class="lineno"> 131</span> }</div> |
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