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<a href="../../d3/d80/z__function_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>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span> </div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span><span class="preprocessor">#include &lt;cstdint&gt;</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span><span class="preprocessor">#include &lt;iostream&gt;</span> </div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span><span class="preprocessor">#ifdef _MSC_VER</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span><span class="preprocessor">#include &lt;string&gt;</span> </div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="preprocessor">#else</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span><span class="preprocessor">#include &lt;cstring&gt;</span> </div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span><span class="preprocessor">#include &lt;cassert&gt;</span> </div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span><span class="preprocessor">#include &lt;vector&gt;</span> </div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span></div>
<div class="foldopen" id="foldopen00029" data-start="{" data-end="}">
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"><a class="line" href="../../d3/d80/z__function_8cpp.html#ac044c4794349a8cff6256b99950d5773"> 29</a></span>std::vector&lt;uint64_t&gt; <a class="code hl_function" href="../../d3/d80/z__function_8cpp.html#ac044c4794349a8cff6256b99950d5773">Z_function</a>(<span class="keyword">const</span> std::string &amp;pattern) {</div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span> uint64_t pattern_length = pattern.size();</div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span> std::vector&lt;uint64_t&gt; z(pattern_length, 0);</div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span> </div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> <span class="keywordflow">for</span> (uint64_t i = 1, l = 0, r = 0; i &lt; pattern_length; i++) {</div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span> <span class="keywordflow">if</span> (i &lt;= r) {</div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span> z[i] = std::min(r - i + 1, z[i - l]);</div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span> }</div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span> <span class="keywordflow">while</span> (i + z[i] &lt; pattern_length &amp;&amp;</div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> pattern[z[i]] == pattern[i + z[i]]) {</div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> z[i]++;</div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> }</div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> <span class="keywordflow">if</span> (i + z[i] - 1 &gt; r) {</div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> r = i + z[i] - 1;</div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> }</div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> }</div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> <span class="keywordflow">return</span> z;</div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span>}</div>
</div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span></div>
<div class="foldopen" id="foldopen00054" data-start="{" data-end="}">
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"><a class="line" href="../../d3/d80/z__function_8cpp.html#ac186ca3ac3a69b5e52543bb13fe46db8"> 54</a></span>std::vector&lt;uint64_t&gt; <a class="code hl_function" href="../../d3/d80/z__function_8cpp.html#ac186ca3ac3a69b5e52543bb13fe46db8">find_pat_in_text</a>(<span class="keyword">const</span> std::string &amp;pattern,</div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> <span class="keyword">const</span> std::string &amp;text) {</div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> uint64_t text_length = text.size(), pattern_length = pattern.size();</div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span> std::vector&lt;uint64_t&gt; z = <a class="code hl_function" href="../../d3/d80/z__function_8cpp.html#ac044c4794349a8cff6256b99950d5773">Z_function</a>(pattern + <span class="charliteral">&#39;#&#39;</span> + text);</div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> std::vector&lt;uint64_t&gt; matching_indexes;</div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> </div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> <span class="keywordflow">for</span> (uint64_t i = 0; i &lt; text_length; i++) {</div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> <span class="keywordflow">if</span> (z[i + pattern_length + 1] == pattern_length) {</div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> matching_indexes.push_back(i);</div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> }</div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> }</div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> <span class="keywordflow">return</span> matching_indexes;</div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span>}</div>
</div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span></div>
<div class="foldopen" id="foldopen00072" data-start="{" data-end="}">
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"><a class="line" href="../../d3/d80/z__function_8cpp.html#aa8dca7b867074164d5f45b0f3851269d"> 72</a></span><span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code hl_function" href="../../d3/d80/z__function_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a>() {</div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> <span class="comment">// usual case</span></div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> std::string text1 = <span class="stringliteral">&quot;alskfjaldsabc1abc1abcbksbcdnsdabcabc&quot;</span>;</div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> std::string pattern1 = <span class="stringliteral">&quot;abc&quot;</span>;</div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> </div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> <span class="comment">// matching_indexes1 gets the indexes where pattern1 exists in text1</span></div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> std::vector&lt;uint64_t&gt; matching_indexes1 = <a class="code hl_function" href="../../d3/d80/z__function_8cpp.html#ac186ca3ac3a69b5e52543bb13fe46db8">find_pat_in_text</a>(pattern1, text1);</div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> assert((matching_indexes1 == std::vector&lt;uint64_t&gt;{10, 14, 18, 30, 33}));</div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> </div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span> <span class="comment">// corner case</span></div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> std::string text2 = <span class="stringliteral">&quot;greengrass&quot;</span>;</div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span> std::string pattern2 = <span class="stringliteral">&quot;abc&quot;</span>;</div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> </div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> <span class="comment">// matching_indexes2 gets the indexes where pattern2 exists in text2</span></div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span> std::vector&lt;uint64_t&gt; matching_indexes2 = <a class="code hl_function" href="../../d3/d80/z__function_8cpp.html#ac186ca3ac3a69b5e52543bb13fe46db8">find_pat_in_text</a>(pattern2, text2);</div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> assert((matching_indexes2 == std::vector&lt;uint64_t&gt;{}));</div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span> </div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span> <span class="comment">// corner case - empty text</span></div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span> std::string text3 = <span class="stringliteral">&quot;&quot;</span>;</div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span> std::string pattern3 = <span class="stringliteral">&quot;abc&quot;</span>;</div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span> </div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span> <span class="comment">// matching_indexes3 gets the indexes where pattern3 exists in text3</span></div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span> std::vector&lt;uint64_t&gt; matching_indexes3 = <a class="code hl_function" href="../../d3/d80/z__function_8cpp.html#ac186ca3ac3a69b5e52543bb13fe46db8">find_pat_in_text</a>(pattern3, text3);</div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span> assert((matching_indexes3 == std::vector&lt;uint64_t&gt;{}));</div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span> </div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span> <span class="comment">// corner case - empty pattern</span></div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span> std::string text4 = <span class="stringliteral">&quot;redsand&quot;</span>;</div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span> std::string pattern4 = <span class="stringliteral">&quot;&quot;</span>;</div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span> </div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span> <span class="comment">// matching_indexes4 gets the indexes where pattern4 exists in text4</span></div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span> std::vector&lt;uint64_t&gt; matching_indexes4 = <a class="code hl_function" href="../../d3/d80/z__function_8cpp.html#ac186ca3ac3a69b5e52543bb13fe46db8">find_pat_in_text</a>(pattern4, text4);</div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span> assert((matching_indexes4 == std::vector&lt;uint64_t&gt;{0, 1, 2, 3, 4, 5, 6}));</div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span>}</div>
</div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"> 105</span></div>
<div class="foldopen" id="foldopen00110" data-start="{" data-end="}">
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"><a class="line" href="../../d3/d80/z__function_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4"> 110</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="../../d3/d80/z__function_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a>() {</div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span> <a class="code hl_function" href="../../d3/d80/z__function_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a>(); <span class="comment">// run self-test implementations</span></div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span> <span class="keywordflow">return</span> 0;</div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span>}</div>
</div>
<div class="ttc" id="az__function_8cpp_html_aa8dca7b867074164d5f45b0f3851269d"><div class="ttname"><a href="../../d3/d80/z__function_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a></div><div class="ttdeci">static void test()</div><div class="ttdoc">Self-test implementations.</div><div class="ttdef"><b>Definition</b> <a href="#l00072">z_function.cpp:72</a></div></div>
<div class="ttc" id="az__function_8cpp_html_ac044c4794349a8cff6256b99950d5773"><div class="ttname"><a href="../../d3/d80/z__function_8cpp.html#ac044c4794349a8cff6256b99950d5773">Z_function</a></div><div class="ttdeci">std::vector&lt; uint64_t &gt; Z_function(const std::string &amp;pattern)</div><div class="ttdoc">for IO operations</div><div class="ttdef"><b>Definition</b> <a href="#l00029">z_function.cpp:29</a></div></div>
<div class="ttc" id="az__function_8cpp_html_ac186ca3ac3a69b5e52543bb13fe46db8"><div class="ttname"><a href="../../d3/d80/z__function_8cpp.html#ac186ca3ac3a69b5e52543bb13fe46db8">find_pat_in_text</a></div><div class="ttdeci">std::vector&lt; uint64_t &gt; find_pat_in_text(const std::string &amp;pattern, const std::string &amp;text)</div><div class="ttdoc">Using Z_function to find a pattern in a text.</div><div class="ttdef"><b>Definition</b> <a href="#l00054">z_function.cpp:54</a></div></div>
<div class="ttc" id="az__function_8cpp_html_ae66f6b31b5ad750f1fe042a706a4e3d4"><div class="ttname"><a href="../../d3/d80/z__function_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a></div><div class="ttdeci">int main()</div><div class="ttdoc">Main function.</div><div class="ttdef"><b>Definition</b> <a href="#l00110">z_function.cpp:110</a></div></div>
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