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| <div class="title">ChineseTokenizer.cs</div> </div> |
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| <a href="_chinese_tokenizer_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"> *</span></div> |
| <div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * Licensed to the Apache Software Foundation (ASF) under one</span></div> |
| <div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * or more contributor license agreements. See the NOTICE file</span></div> |
| <div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * distributed with this work for additional information</span></div> |
| <div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * regarding copyright ownership. The ASF licenses this file</span></div> |
| <div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * to you under the Apache License, Version 2.0 (the</span></div> |
| <div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * "License"); you may not use this file except in compliance</span></div> |
| <div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * with the License. You may obtain a copy of the License at</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"> * http://www.apache.org/licenses/LICENSE-2.0</span></div> |
| <div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> *</span></div> |
| <div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * Unless required by applicable law or agreed to in writing,</span></div> |
| <div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * software distributed under the License is distributed on an</span></div> |
| <div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</span></div> |
| <div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * KIND, either express or implied. See the License for the</span></div> |
| <div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * specific language governing permissions and limitations</span></div> |
| <div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * under the License.</span></div> |
| <div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> *</span></div> |
| <div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment">*/</span></div> |
| <div class="line"><a name="l00021"></a><span class="lineno"> 21</span> </div> |
| <div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="keyword">using</span> System;</div> |
| <div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="keyword">using</span> System.IO;</div> |
| <div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="keyword">using</span> System.Text;</div> |
| <div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="keyword">using</span> System.Collections;</div> |
| <div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="keyword">using</span> System.Globalization;</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">using</span> Lucene.Net.Analysis;</div> |
| <div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="keyword">using</span> Lucene.Net.Analysis.Tokenattributes;</div> |
| <div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="keyword">using</span> Lucene.Net.Util;</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> <span class="keyword">namespace </span>Lucene.Net.Analysis.Cn</div> |
| <div class="line"><a name="l00033"></a><span class="lineno"> 33</span> {</div> |
| <div class="line"><a name="l00058"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_cn_1_1_chinese_tokenizer.html"> 58</a></span>  <span class="keyword">public</span> sealed <span class="keyword">class </span><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_cn_1_1_chinese_tokenizer.html" title="Tokenize Chinese text as individual chinese chars.">ChineseTokenizer</a> : <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_tokenizer.html" title="A Tokenizer is a TokenStream whose input is a Reader. This is an abstract class; subclasses must over...">Tokenizer</a></div> |
| <div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  {</div> |
| <div class="line"><a name="l00060"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_cn_1_1_chinese_tokenizer.html#a5a6e34e85c11f730b5f2e21941b4a1e0"> 60</a></span>  <span class="keyword">public</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_cn_1_1_chinese_tokenizer.html" title="Tokenize Chinese text as individual chinese chars.">ChineseTokenizer</a>(TextReader _in)</div> |
| <div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  : base(_in)</div> |
| <div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  {</div> |
| <div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  Init();</div> |
| <div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  }</div> |
| <div class="line"><a name="l00065"></a><span class="lineno"> 65</span> </div> |
| <div class="line"><a name="l00066"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_cn_1_1_chinese_tokenizer.html#a6078476bac3b187f9d4c425ef1a25062"> 66</a></span>  <span class="keyword">public</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_cn_1_1_chinese_tokenizer.html" title="Tokenize Chinese text as individual chinese chars.">ChineseTokenizer</a>(<a class="code" href="class_lucene_1_1_net_1_1_util_1_1_attribute_source.html" title="An AttributeSource contains a list of different Attributes, and methods to add and get them...">AttributeSource</a> source, TextReader _in)</div> |
| <div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  : base(source, _in)</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>  Init();</div> |
| <div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  }</div> |
| <div class="line"><a name="l00071"></a><span class="lineno"> 71</span> </div> |
| <div class="line"><a name="l00072"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_cn_1_1_chinese_tokenizer.html#a710eae664d84799466454d8557bbbbe8"> 72</a></span>  <span class="keyword">public</span> <a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_cn_1_1_chinese_tokenizer.html" title="Tokenize Chinese text as individual chinese chars.">ChineseTokenizer</a>(<a class="code" href="class_lucene_1_1_net_1_1_util_1_1_attribute_source_1_1_attribute_factory.html" title="An AttributeFactory creates instances of Attributes.">AttributeFactory</a> factory, TextReader _in)</div> |
| <div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  : base(factory, _in)</div> |
| <div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  {</div> |
| <div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  Init();</div> |
| <div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  }</div> |
| <div class="line"><a name="l00077"></a><span class="lineno"> 77</span> </div> |
| <div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="keyword">private</span> <span class="keywordtype">void</span> Init()</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>  termAtt = AddAttribute<ITermAttribute>();</div> |
| <div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  offsetAtt = AddAttribute<IOffsetAttribute>();</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> </div> |
| <div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keyword">private</span> <span class="keywordtype">int</span> offset = 0, bufferIndex = 0, dataLen = 0;</div> |
| <div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keyword">private</span> <span class="keyword">static</span> readonly <span class="keywordtype">int</span> MAX_WORD_LEN = 255;</div> |
| <div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keyword">private</span> <span class="keyword">static</span> readonly <span class="keywordtype">int</span> IO_BUFFER_SIZE = 1024;</div> |
| <div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keyword">private</span> readonly <span class="keywordtype">char</span>[] buffer = <span class="keyword">new</span> <span class="keywordtype">char</span>[MAX_WORD_LEN];</div> |
| <div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keyword">private</span> readonly <span class="keywordtype">char</span>[] ioBuffer = <span class="keyword">new</span> <span class="keywordtype">char</span>[IO_BUFFER_SIZE];</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>  <span class="keyword">private</span> <span class="keywordtype">int</span> length;</div> |
| <div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="keyword">private</span> <span class="keywordtype">int</span> start;</div> |
| <div class="line"><a name="l00092"></a><span class="lineno"> 92</span> </div> |
| <div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keyword">private</span> <a class="code" href="interface_lucene_1_1_net_1_1_analysis_1_1_tokenattributes_1_1_i_term_attribute.html" title="The term text of a Token.">ITermAttribute</a> termAtt;</div> |
| <div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keyword">private</span> <a class="code" href="interface_lucene_1_1_net_1_1_analysis_1_1_tokenattributes_1_1_i_offset_attribute.html" title="The start and end character offset of a Token. ">IOffsetAttribute</a> offsetAtt;</div> |
| <div class="line"><a name="l00095"></a><span class="lineno"> 95</span> </div> |
| <div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keyword">private</span> <span class="keywordtype">void</span> Push(<span class="keywordtype">char</span> c)</div> |
| <div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  {</div> |
| <div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="keywordflow">if</span> (length == 0) start = offset - 1; <span class="comment">// start of token</span></div> |
| <div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  buffer[length++] = Char.ToLower(c); <span class="comment">// buffer it</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> </div> |
| <div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keyword">private</span> <span class="keywordtype">bool</span> Flush()</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">if</span> (length > 0)</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>  termAtt.SetTermBuffer(buffer, 0, length);</div> |
| <div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  offsetAtt.<a class="code" href="interface_lucene_1_1_net_1_1_analysis_1_1_tokenattributes_1_1_i_offset_attribute.html#a34b717584a38139445eb689bf86cabb7" title="Set the starting and ending offset. See StartOffset() and EndOffset() ">SetOffset</a>(CorrectOffset(start), CorrectOffset(start + length));</div> |
| <div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div> |
| <div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  }</div> |
| <div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keywordflow">else</span></div> |
| <div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div> |
| <div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  }</div> |
| <div class="line"><a name="l00114"></a><span class="lineno"> 114</span> </div> |
| <div class="line"><a name="l00115"></a><span class="lineno"> 115</span> </div> |
| <div class="line"><a name="l00116"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_cn_1_1_chinese_tokenizer.html#ad71dabe1232b503cbc2f9bdfc49b94c5"> 116</a></span>  <span class="keyword">public</span> <span class="keyword">override</span> <span class="keywordtype">bool</span> IncrementToken()</div> |
| <div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  {</div> |
| <div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  ClearAttributes();</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>  length = 0;</div> |
| <div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  start = offset;</div> |
| <div class="line"><a name="l00122"></a><span class="lineno"> 122</span> </div> |
| <div class="line"><a name="l00123"></a><span class="lineno"> 123</span> </div> |
| <div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="keywordflow">while</span> (<span class="keyword">true</span>)</div> |
| <div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  {</div> |
| <div class="line"><a name="l00126"></a><span class="lineno"> 126</span> </div> |
| <div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="keywordtype">char</span> c;</div> |
| <div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  offset++;</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>  <span class="keywordflow">if</span> (bufferIndex >= dataLen)</div> |
| <div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  {</div> |
| <div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  dataLen = input.Read(ioBuffer, 0, ioBuffer.Length);</div> |
| <div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  bufferIndex = 0;</div> |
| <div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  }</div> |
| <div class="line"><a name="l00135"></a><span class="lineno"> 135</span> </div> |
| <div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <span class="keywordflow">if</span> (dataLen == 0)</div> |
| <div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  {</div> |
| <div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  offset--;</div> |
| <div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="keywordflow">return</span> Flush();</div> |
| <div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  }</div> |
| <div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  <span class="keywordflow">else</span></div> |
| <div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  c = ioBuffer[bufferIndex++];</div> |
| <div class="line"><a name="l00143"></a><span class="lineno"> 143</span> </div> |
| <div class="line"><a name="l00144"></a><span class="lineno"> 144</span> </div> |
| <div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="keywordflow">switch</span> (<span class="keywordtype">char</span>.GetUnicodeCategory(c))</div> |
| <div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  {</div> |
| <div class="line"><a name="l00147"></a><span class="lineno"> 147</span> </div> |
| <div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  <span class="keywordflow">case</span> UnicodeCategory.DecimalDigitNumber:</div> |
| <div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <span class="keywordflow">case</span> UnicodeCategory.LowercaseLetter:</div> |
| <div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="keywordflow">case</span> UnicodeCategory.UppercaseLetter:</div> |
| <div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  Push(c);</div> |
| <div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="keywordflow">if</span> (length == MAX_WORD_LEN) <span class="keywordflow">return</span> Flush();</div> |
| <div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <span class="keywordflow">break</span>;</div> |
| <div class="line"><a name="l00154"></a><span class="lineno"> 154</span> </div> |
| <div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  <span class="keywordflow">case</span> UnicodeCategory.OtherLetter:</div> |
| <div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  <span class="keywordflow">if</span> (length > 0)</div> |
| <div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  {</div> |
| <div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  bufferIndex--;</div> |
| <div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  offset--;</div> |
| <div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  <span class="keywordflow">return</span> Flush();</div> |
| <div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  }</div> |
| <div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  Push(c);</div> |
| <div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  <span class="keywordflow">return</span> Flush();</div> |
| <div class="line"><a name="l00164"></a><span class="lineno"> 164</span> </div> |
| <div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  <span class="keywordflow">default</span>:</div> |
| <div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  <span class="keywordflow">if</span> (length > 0) <span class="keywordflow">return</span> Flush();</div> |
| <div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  <span class="keywordflow">break</span>;</div> |
| <div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  }</div> |
| <div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  }</div> |
| <div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  }</div> |
| <div class="line"><a name="l00171"></a><span class="lineno"> 171</span> </div> |
| <div class="line"><a name="l00172"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_cn_1_1_chinese_tokenizer.html#ad5292695fcc723ca2a94daaf3079153d"> 172</a></span>  <span class="keyword">public</span> <span class="keyword">override</span> sealed <span class="keywordtype">void</span> End()</div> |
| <div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  {</div> |
| <div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  <span class="comment">// set final offset</span></div> |
| <div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  <span class="keywordtype">int</span> finalOffset = CorrectOffset(offset);</div> |
| <div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  this.offsetAtt.SetOffset(finalOffset, finalOffset);</div> |
| <div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  }</div> |
| <div class="line"><a name="l00178"></a><span class="lineno"> 178</span> </div> |
| <div class="line"><a name="l00179"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_cn_1_1_chinese_tokenizer.html#a5237e0e772eae62b061c22881e774635"> 179</a></span>  <span class="keyword">public</span> <span class="keyword">override</span> <span class="keywordtype">void</span> Reset()</div> |
| <div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  {</div> |
| <div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  base.Reset();</div> |
| <div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  offset = bufferIndex = dataLen = 0;</div> |
| <div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  }</div> |
| <div class="line"><a name="l00184"></a><span class="lineno"> 184</span> </div> |
| <div class="line"><a name="l00185"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_analysis_1_1_cn_1_1_chinese_tokenizer.html#a498cc79aa81e9767941e8f4b3205cf87"> 185</a></span>  <span class="keyword">public</span> <span class="keyword">override</span> <span class="keywordtype">void</span> Reset(TextReader input)</div> |
| <div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  {</div> |
| <div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  base.Reset(input);</div> |
| <div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  Reset();</div> |
| <div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  }</div> |
| <div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  }</div> |
| <div class="line"><a name="l00191"></a><span class="lineno"> 191</span> }</div> |
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