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<div class="headertitle"><div class="title">knuth_morris_pratt.cpp</div></div>
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<div class="contents">
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<a href="../../de/d6a/knuth__morris__pratt_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span></div>
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<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span> </div>
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<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span><span class="preprocessor">#include <cassert></span> </div>
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<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span><span class="preprocessor">#include <iostream></span> </div>
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<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="preprocessor">#include <string></span> </div>
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<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span><span class="preprocessor">#include <vector></span> </div>
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<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span></div>
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<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span><span class="keyword">namespace </span><a class="code hl_namespace" href="../../d9/d03/namespacestring__search.html">string_search</a> {</div>
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<div class="foldopen" id="foldopen00032" data-start="{" data-end="}">
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<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"><a class="line" href="../../d9/d03/namespacestring__search.html#a83c72ff237cdf623e42d4295e0029bf9"> 32</a></span>std::vector<size_t> <a class="code hl_function" href="../../d9/d03/namespacestring__search.html#a83c72ff237cdf623e42d4295e0029bf9">getFailureArray</a>(<span class="keyword">const</span> std::string &pattern) {</div>
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<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> <span class="keywordtype">size_t</span> pattern_length = pattern.size();</div>
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<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span> std::vector<size_t> failure(pattern_length + 1);</div>
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<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span> failure[0] = std::string::npos;</div>
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<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span> <span class="keywordtype">size_t</span> j = std::string::npos;</div>
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<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < pattern_length; i++) {</div>
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<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> <span class="keywordflow">while</span> (j != std::string::npos && pattern[j] != pattern[i]) {</div>
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<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> j = failure[j];</div>
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<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> }</div>
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<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> failure[i + 1] = ++j;</div>
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<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> }</div>
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<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> <span class="keywordflow">return</span> failure;</div>
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<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span>}</div>
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</div>
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<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span></div>
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<div class="foldopen" id="foldopen00053" data-start="{" data-end="}">
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<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"><a class="line" href="../../d9/d03/namespacestring__search.html#a1e37af2f023495129cb57338c801209e"> 53</a></span><span class="keywordtype">size_t</span> <a class="code hl_function" href="../../d9/d03/namespacestring__search.html#a1e37af2f023495129cb57338c801209e">kmp</a>(<span class="keyword">const</span> std::string &pattern, <span class="keyword">const</span> std::string &text) {</div>
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<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> <span class="keywordflow">if</span> (pattern.empty()) {</div>
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<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> <span class="keywordflow">return</span> 0;</div>
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<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> }</div>
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<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span> std::vector<size_t> failure = <a class="code hl_function" href="../../d9/d03/namespacestring__search.html#a83c72ff237cdf623e42d4295e0029bf9">getFailureArray</a>(pattern);</div>
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<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> <span class="keywordtype">size_t</span> text_length = text.size();</div>
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<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> <span class="keywordtype">size_t</span> pattern_length = pattern.size();</div>
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<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> <span class="keywordtype">size_t</span> k = 0;</div>
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<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> j = 0; j < text_length; j++) {</div>
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<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> <span class="keywordflow">while</span> (k != std::string::npos && pattern[k] != text[j]) {</div>
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<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> k = failure[k];</div>
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<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> }</div>
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<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> <span class="keywordflow">if</span> (++k == pattern_length) {</div>
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<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> <span class="keywordflow">return</span> j - k + 1;</div>
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<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> }</div>
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<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> }</div>
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<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> <span class="keywordflow">return</span> std::string::npos;</div>
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<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span>}</div>
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</div>
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<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span>} <span class="comment">// namespace string_search</span></div>
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<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> </div>
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<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span><span class="keyword">using </span><a class="code hl_function" href="../../d9/d03/namespacestring__search.html#a1e37af2f023495129cb57338c801209e">string_search::kmp</a>;</div>
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<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span></div>
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<div class="foldopen" id="foldopen00079" data-start="{" data-end="}">
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<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"><a class="line" href="../../de/d6a/knuth__morris__pratt_8cpp.html#a483bb8ccf42aaf7375a83e91490eda1e"> 79</a></span><span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code hl_function" href="../../de/d6a/knuth__morris__pratt_8cpp.html#a483bb8ccf42aaf7375a83e91490eda1e">tests</a>() {</div>
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<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> assert(<a class="code hl_function" href="../../de/d6a/knuth__morris__pratt_8cpp.html#a1e37af2f023495129cb57338c801209e">kmp</a>(<span class="stringliteral">"abc1abc12l"</span>, <span class="stringliteral">"alskfjaldsabc1abc1abc12k2"</span>) == std::string::npos);</div>
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<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span> assert(<a class="code hl_function" href="../../de/d6a/knuth__morris__pratt_8cpp.html#a1e37af2f023495129cb57338c801209e">kmp</a>(<span class="stringliteral">"bca"</span>, <span class="stringliteral">"abcabc"</span>) == 1);</div>
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<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> assert(<a class="code hl_function" href="../../de/d6a/knuth__morris__pratt_8cpp.html#a1e37af2f023495129cb57338c801209e">kmp</a>(<span class="stringliteral">"World"</span>, <span class="stringliteral">"helloWorld"</span>) == 5);</div>
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<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span> assert(<a class="code hl_function" href="../../de/d6a/knuth__morris__pratt_8cpp.html#a1e37af2f023495129cb57338c801209e">kmp</a>(<span class="stringliteral">"c++"</span>, <span class="stringliteral">"his_is_c++"</span>) == 7);</div>
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<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> assert(<a class="code hl_function" href="../../de/d6a/knuth__morris__pratt_8cpp.html#a1e37af2f023495129cb57338c801209e">kmp</a>(<span class="stringliteral">"happy"</span>, <span class="stringliteral">"happy_coding"</span>) == 0);</div>
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<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> assert(<a class="code hl_function" href="../../de/d6a/knuth__morris__pratt_8cpp.html#a1e37af2f023495129cb57338c801209e">kmp</a>(<span class="stringliteral">""</span>, <span class="stringliteral">"pattern is empty"</span>) == 0);</div>
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<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span> </div>
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<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> <span class="comment">// this lets the user know that the tests have passed</span></div>
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<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span> std::cout << <span class="stringliteral">"All KMP algorithm tests have successfully passed!\n"</span>;</div>
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<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span>}</div>
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</div>
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<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span> </div>
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<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span><span class="comment">/*</span></div>
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<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span><span class="comment"> * @brief Main function</span></div>
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<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span><span class="comment"> * @returns 0 on exit</span></div>
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<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span><span class="comment"> */</span></div>
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<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span><span class="keywordtype">int</span> <a class="code hl_function" href="../../dd/d1e/generate__parentheses_8cpp.html#gae66f6b31b5ad750f1fe042a706a4e3d4">main</a>() {</div>
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<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span> <a class="code hl_function" href="../../de/d6a/knuth__morris__pratt_8cpp.html#a483bb8ccf42aaf7375a83e91490eda1e">tests</a>();</div>
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<div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span> <span class="keywordflow">return</span> 0;</div>
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<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span>}</div>
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<div class="ttc" id="agenerate__parentheses_8cpp_html_gae66f6b31b5ad750f1fe042a706a4e3d4"><div class="ttname"><a href="../../dd/d1e/generate__parentheses_8cpp.html#gae66f6b31b5ad750f1fe042a706a4e3d4">main</a></div><div class="ttdeci">int main()</div><div class="ttdoc">Main function.</div><div class="ttdef"><b>Definition</b> <a href="../../dd/d1e/generate__parentheses_8cpp_source.html#l00110">generate_parentheses.cpp:110</a></div></div>
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<div class="ttc" id="aknuth__morris__pratt_8cpp_html_a1e37af2f023495129cb57338c801209e"><div class="ttname"><a href="../../de/d6a/knuth__morris__pratt_8cpp.html#a1e37af2f023495129cb57338c801209e">kmp</a></div><div class="ttdeci">size_t kmp(const std::string &pattern, const std::string &text)</div><div class="ttdoc">KMP algorithm to find a pattern in a text.</div><div class="ttdef"><b>Definition</b> <a href="#l00053">knuth_morris_pratt.cpp:53</a></div></div>
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<div class="ttc" id="aknuth__morris__pratt_8cpp_html_a483bb8ccf42aaf7375a83e91490eda1e"><div class="ttname"><a href="../../de/d6a/knuth__morris__pratt_8cpp.html#a483bb8ccf42aaf7375a83e91490eda1e">tests</a></div><div class="ttdeci">static void tests()</div><div class="ttdoc">self-test implementations</div><div class="ttdef"><b>Definition</b> <a href="#l00079">knuth_morris_pratt.cpp:79</a></div></div>
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<div class="ttc" id="anamespacestring__search_html"><div class="ttname"><a href="../../d9/d03/namespacestring__search.html">string_search</a></div><div class="ttdoc">String search algorithms.</div><div class="ttdef"><b>Definition</b> <a href="../../d3/d7d/brute__force__string__searching_8cpp_source.html#l00013">brute_force_string_searching.cpp:13</a></div></div>
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<div class="ttc" id="anamespacestring__search_html_a1e37af2f023495129cb57338c801209e"><div class="ttname"><a href="../../d9/d03/namespacestring__search.html#a1e37af2f023495129cb57338c801209e">string_search::kmp</a></div><div class="ttdeci">size_t kmp(const std::string &pattern, const std::string &text)</div><div class="ttdoc">KMP algorithm to find a pattern in a text.</div><div class="ttdef"><b>Definition</b> <a href="#l00053">knuth_morris_pratt.cpp:53</a></div></div>
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<div class="ttc" id="anamespacestring__search_html_a83c72ff237cdf623e42d4295e0029bf9"><div class="ttname"><a href="../../d9/d03/namespacestring__search.html#a83c72ff237cdf623e42d4295e0029bf9">string_search::getFailureArray</a></div><div class="ttdeci">std::vector< size_t > getFailureArray(const std::string &pattern)</div><div class="ttdoc">Generate the partial match table aka failure function for a pattern to search.</div><div class="ttdef"><b>Definition</b> <a href="#l00032">knuth_morris_pratt.cpp:32</a></div></div>
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