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  <h1>Source code for pygraph.utils.trie</h1><div class="highlight"><pre>
<span></span><span class="ch">#!/usr/bin/env python3</span>
<span class="c1"># -*- coding: utf-8 -*-</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">Created on Wed Jan 30 10:48:49 2019</span>

<span class="sd">Trie (prefix tree)</span>
<span class="sd">@author: ljia</span>
<span class="sd">@references:</span>
<span class="sd">        https://viblo.asia/p/nlp-build-a-trie-data-structure-from-scratch-with-python-3P0lPzroKox, 2019.1</span>
<span class="sd">&quot;&quot;&quot;</span>

<span class="kn">import</span> <span class="nn">pickle</span>
<span class="kn">import</span> <span class="nn">json</span>

<span class="sd">&quot;&quot;&quot; Trie class</span>
<span class="sd">&quot;&quot;&quot;</span>
<div class="viewcode-block" id="Trie"><a class="viewcode-back" href="../../../pygraph.utils.html#pygraph.utils.trie.Trie">[docs]</a><span class="k">class</span> <span class="nc">Trie</span><span class="p">:</span>
    <span class="c1"># init Trie class</span>
    <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">root</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">getNode</span><span class="p">()</span>

<div class="viewcode-block" id="Trie.getNode"><a class="viewcode-back" href="../../../pygraph.utils.html#pygraph.utils.trie.Trie.getNode">[docs]</a>    <span class="k">def</span> <span class="nf">getNode</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="k">return</span> <span class="p">{</span><span class="s2">&quot;isEndOfWord&quot;</span><span class="p">:</span> <span class="kc">False</span><span class="p">,</span> <span class="s2">&quot;children&quot;</span><span class="p">:</span> <span class="p">{}}</span></div>

<div class="viewcode-block" id="Trie.insertWord"><a class="viewcode-back" href="../../../pygraph.utils.html#pygraph.utils.trie.Trie.insertWord">[docs]</a>    <span class="k">def</span> <span class="nf">insertWord</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">word</span><span class="p">):</span>
        <span class="n">current</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">root</span>
        <span class="k">for</span> <span class="n">ch</span> <span class="ow">in</span> <span class="n">word</span><span class="p">:</span>

            <span class="k">if</span> <span class="n">ch</span> <span class="ow">in</span> <span class="n">current</span><span class="p">[</span><span class="s2">&quot;children&quot;</span><span class="p">]:</span>
                <span class="n">node</span> <span class="o">=</span> <span class="n">current</span><span class="p">[</span><span class="s2">&quot;children&quot;</span><span class="p">][</span><span class="n">ch</span><span class="p">]</span>
            <span class="k">else</span><span class="p">:</span>
                <span class="n">node</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">getNode</span><span class="p">()</span>
                <span class="n">current</span><span class="p">[</span><span class="s2">&quot;children&quot;</span><span class="p">][</span><span class="n">ch</span><span class="p">]</span> <span class="o">=</span> <span class="n">node</span>

            <span class="n">current</span> <span class="o">=</span> <span class="n">node</span>
        <span class="n">current</span><span class="p">[</span><span class="s2">&quot;isEndOfWord&quot;</span><span class="p">]</span> <span class="o">=</span> <span class="kc">True</span>
        <span class="k">if</span> <span class="s1">&#39;count&#39;</span> <span class="ow">in</span> <span class="n">current</span><span class="p">:</span>
            <span class="n">current</span><span class="p">[</span><span class="s1">&#39;count&#39;</span><span class="p">]</span> <span class="o">+=</span> <span class="mi">1</span>
        <span class="k">else</span><span class="p">:</span>
            <span class="n">current</span><span class="p">[</span><span class="s1">&#39;count&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="mi">1</span></div>

<div class="viewcode-block" id="Trie.searchWord"><a class="viewcode-back" href="../../../pygraph.utils.html#pygraph.utils.trie.Trie.searchWord">[docs]</a>    <span class="k">def</span> <span class="nf">searchWord</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">word</span><span class="p">):</span>
        <span class="n">current</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">root</span>
        <span class="k">for</span> <span class="n">ch</span> <span class="ow">in</span> <span class="n">word</span><span class="p">:</span>
            <span class="k">if</span> <span class="n">ch</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">current</span><span class="p">[</span><span class="s2">&quot;children&quot;</span><span class="p">]:</span>
                <span class="k">return</span> <span class="mi">0</span>
            <span class="n">node</span> <span class="o">=</span> <span class="n">current</span><span class="p">[</span><span class="s2">&quot;children&quot;</span><span class="p">][</span><span class="n">ch</span><span class="p">]</span>

            <span class="n">current</span> <span class="o">=</span> <span class="n">node</span>
        <span class="k">if</span> <span class="s1">&#39;count&#39;</span> <span class="ow">in</span> <span class="n">current</span><span class="p">:</span>
            <span class="k">return</span> <span class="n">current</span><span class="p">[</span><span class="s2">&quot;count&quot;</span><span class="p">]</span>
        <span class="k">else</span><span class="p">:</span>
            <span class="k">return</span> <span class="mi">0</span></div>

<div class="viewcode-block" id="Trie.searchWordPrefix"><a class="viewcode-back" href="../../../pygraph.utils.html#pygraph.utils.trie.Trie.searchWordPrefix">[docs]</a>    <span class="k">def</span> <span class="nf">searchWordPrefix</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">word</span><span class="p">):</span>
        <span class="n">current</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">root</span>
        <span class="k">for</span> <span class="n">ch</span> <span class="ow">in</span> <span class="n">word</span><span class="p">:</span>
            <span class="k">if</span> <span class="ow">not</span> <span class="n">current</span><span class="p">[</span><span class="s2">&quot;children&quot;</span><span class="p">]</span><span class="o">.</span><span class="n">has_key</span><span class="p">(</span><span class="n">ch</span><span class="p">):</span>
                <span class="k">return</span> <span class="kc">False</span>
            <span class="n">node</span> <span class="o">=</span> <span class="n">current</span><span class="p">[</span><span class="s2">&quot;children&quot;</span><span class="p">][</span><span class="n">ch</span><span class="p">]</span>

            <span class="n">current</span> <span class="o">=</span> <span class="n">node</span>
        <span class="c1"># return True if children contain keys and values</span>
        <span class="k">return</span> <span class="nb">bool</span><span class="p">(</span><span class="n">current</span><span class="p">[</span><span class="s2">&quot;children&quot;</span><span class="p">])</span></div>

<div class="viewcode-block" id="Trie.deleteWord"><a class="viewcode-back" href="../../../pygraph.utils.html#pygraph.utils.trie.Trie.deleteWord">[docs]</a>    <span class="k">def</span> <span class="nf">deleteWord</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">word</span><span class="p">):</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_delete</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">root</span><span class="p">,</span> <span class="n">word</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span></div>

    <span class="k">def</span> <span class="nf">_delete</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">current</span><span class="p">,</span> <span class="n">word</span><span class="p">,</span> <span class="n">index</span><span class="p">):</span>
        <span class="k">if</span><span class="p">(</span><span class="n">index</span> <span class="o">==</span> <span class="nb">len</span><span class="p">(</span><span class="n">word</span><span class="p">)):</span>
            <span class="k">if</span> <span class="ow">not</span> <span class="n">current</span><span class="p">[</span><span class="s2">&quot;isEndOfWord&quot;</span><span class="p">]:</span>
                <span class="k">return</span> <span class="kc">False</span>
            <span class="n">current</span><span class="p">[</span><span class="s2">&quot;isEndOfWord&quot;</span><span class="p">]</span> <span class="o">=</span> <span class="kc">False</span>
            <span class="k">return</span> <span class="nb">len</span><span class="p">(</span><span class="n">current</span><span class="p">[</span><span class="s2">&quot;children&quot;</span><span class="p">]</span><span class="o">.</span><span class="n">keys</span><span class="p">())</span> <span class="o">==</span> <span class="mi">0</span>

        <span class="n">ch</span> <span class="o">=</span> <span class="n">word</span><span class="p">[</span><span class="n">index</span><span class="p">]</span>
        <span class="k">if</span> <span class="ow">not</span> <span class="n">current</span><span class="p">[</span><span class="s2">&quot;children&quot;</span><span class="p">]</span><span class="o">.</span><span class="n">has_key</span><span class="p">(</span><span class="n">ch</span><span class="p">):</span>
            <span class="k">return</span> <span class="kc">False</span>
        <span class="n">node</span> <span class="o">=</span> <span class="n">current</span><span class="p">[</span><span class="s2">&quot;children&quot;</span><span class="p">][</span><span class="n">ch</span><span class="p">]</span>

        <span class="n">should_delete_current_node</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_delete</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">word</span><span class="p">,</span> <span class="n">index</span> <span class="o">+</span> <span class="mi">1</span><span class="p">)</span>

        <span class="k">if</span> <span class="n">should_delete_current_node</span><span class="p">:</span>
            <span class="n">current</span><span class="p">[</span><span class="s2">&quot;children&quot;</span><span class="p">]</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="n">ch</span><span class="p">)</span>
            <span class="k">return</span> <span class="nb">len</span><span class="p">(</span><span class="n">current</span><span class="p">[</span><span class="s2">&quot;children&quot;</span><span class="p">]</span><span class="o">.</span><span class="n">keys</span><span class="p">())</span> <span class="o">==</span> <span class="mi">0</span>

        <span class="k">return</span> <span class="kc">False</span>

<div class="viewcode-block" id="Trie.save_to_pickle"><a class="viewcode-back" href="../../../pygraph.utils.html#pygraph.utils.trie.Trie.save_to_pickle">[docs]</a>    <span class="k">def</span> <span class="nf">save_to_pickle</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">file_name</span><span class="p">):</span>
        <span class="n">f</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="n">file_name</span> <span class="o">+</span> <span class="s2">&quot;.pkl&quot;</span><span class="p">,</span> <span class="s2">&quot;wb&quot;</span><span class="p">)</span>
        <span class="n">pickle</span><span class="o">.</span><span class="n">dump</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">root</span><span class="p">,</span> <span class="n">f</span><span class="p">)</span>
        <span class="n">f</span><span class="o">.</span><span class="n">close</span><span class="p">()</span></div>

<div class="viewcode-block" id="Trie.load_from_pickle"><a class="viewcode-back" href="../../../pygraph.utils.html#pygraph.utils.trie.Trie.load_from_pickle">[docs]</a>    <span class="k">def</span> <span class="nf">load_from_pickle</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">file_name</span><span class="p">):</span>
        <span class="n">f</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="n">file_name</span> <span class="o">+</span> <span class="s2">&quot;.pkl&quot;</span><span class="p">,</span> <span class="s2">&quot;rb&quot;</span><span class="p">)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">root</span> <span class="o">=</span> <span class="n">pickle</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="n">f</span><span class="p">)</span>
        <span class="n">f</span><span class="o">.</span><span class="n">close</span><span class="p">()</span></div>
        
<div class="viewcode-block" id="Trie.to_json"><a class="viewcode-back" href="../../../pygraph.utils.html#pygraph.utils.trie.Trie.to_json">[docs]</a>    <span class="k">def</span> <span class="nf">to_json</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="k">return</span> <span class="n">json</span><span class="o">.</span><span class="n">dump</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">root</span><span class="p">)</span></div>

<div class="viewcode-block" id="Trie.save_to_json"><a class="viewcode-back" href="../../../pygraph.utils.html#pygraph.utils.trie.Trie.save_to_json">[docs]</a>    <span class="k">def</span> <span class="nf">save_to_json</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">file_name</span><span class="p">):</span>
        <span class="n">json_data</span> <span class="o">=</span> <span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">root</span><span class="p">)</span>
        <span class="n">f</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="n">file_name</span> <span class="o">+</span> <span class="s2">&quot;.json&quot;</span><span class="p">,</span> <span class="s2">&quot;w&quot;</span><span class="p">)</span>
        <span class="n">f</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">json_data</span><span class="p">)</span>
        <span class="n">f</span><span class="o">.</span><span class="n">close</span><span class="p">()</span></div>

<div class="viewcode-block" id="Trie.load_from_json"><a class="viewcode-back" href="../../../pygraph.utils.html#pygraph.utils.trie.Trie.load_from_json">[docs]</a>    <span class="k">def</span> <span class="nf">load_from_json</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">file_name</span><span class="p">):</span>
        <span class="n">json_file</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="n">file_name</span> <span class="o">+</span> <span class="s2">&quot;.json&quot;</span><span class="p">,</span> <span class="s2">&quot;r&quot;</span><span class="p">)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">root</span> <span class="o">=</span> <span class="n">json</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="n">json_file</span><span class="p">)</span>
        <span class="n">json_file</span><span class="o">.</span><span class="n">close</span><span class="p">()</span></div></div>
</pre></div>

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