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<p class="pln"><span class="n"><a id="t1" href="#t1">1</a></span><span class="t"><span class="str">""" Indentation utilities for Cog.</span> </span><span class="r"></span></p>
<p class="pln"><span class="n"><a id="t2" href="#t2">2</a></span><span class="t"><span class="str">"""</span> </span><span class="r"></span></p>
<p class="pln"><span class="n"><a id="t3" href="#t3">3</a></span><span class="t"> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t4" href="#t4">4</a></span><span class="t"><span class="key">import</span> <span class="nam">re</span> </span><span class="r"></span></p>
<p class="pln"><span class="n"><a id="t5" href="#t5">5</a></span><span class="t"> </span><span class="r"></span></p>
<p class="pln"><span class="n"><a id="t6" href="#t6">6</a></span><span class="t"> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t7" href="#t7">7</a></span><span class="t"><span class="key">def</span> <span class="nam">whitePrefix</span><span class="op">(</span><span class="nam">strings</span><span class="op">)</span><span class="op">:</span> </span><span class="r"></span></p>
<p class="pln"><span class="n"><a id="t8" href="#t8">8</a></span><span class="t"> <span class="str">""" Determine the whitespace prefix common to all non-blank lines</span> </span><span class="r"></span></p>
<p class="pln"><span class="n"><a id="t9" href="#t9">9</a></span><span class="t"><span class="str"> in the argument list.</span> </span><span class="r"></span></p>
<p class="pln"><span class="n"><a id="t10" href="#t10">10</a></span><span class="t"><span class="str"> """</span> </span><span class="r"></span></p>
<p class="pln"><span class="n"><a id="t11" href="#t11">11</a></span><span class="t"> <span class="com"># Remove all blank lines from the list</span> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t12" href="#t12">12</a></span><span class="t"> <span class="nam">strings</span> <span class="op">=</span> <span class="op">[</span><span class="nam">s</span> <span class="key">for</span> <span class="nam">s</span> <span class="key">in</span> <span class="nam">strings</span> <span class="key">if</span> <span class="nam">s</span><span class="op">.</span><span class="nam">strip</span><span class="op">(</span><span class="op">)</span> <span class="op">!=</span> <span class="str">''</span><span class="op">]</span> </span><span class="r"></span></p>
<p class="pln"><span class="n"><a id="t13" href="#t13">13</a></span><span class="t"> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t14" href="#t14">14</a></span><span class="t"> <span class="key">if</span> <span class="key">not</span> <span class="nam">strings</span><span class="op">:</span> <span class="key">return</span> <span class="str">''</span> </span><span class="r"></span></p>
<p class="pln"><span class="n"><a id="t15" href="#t15">15</a></span><span class="t"> </span><span class="r"></span></p>
<p class="pln"><span class="n"><a id="t16" href="#t16">16</a></span><span class="t"> <span class="com"># Find initial whitespace chunk in the first line.</span> </span><span class="r"></span></p>
<p class="pln"><span class="n"><a id="t17" href="#t17">17</a></span><span class="t"> <span class="com"># This is the best prefix we can hope for.</span> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t18" href="#t18">18</a></span><span class="t"> <span class="nam">pat</span> <span class="op">=</span> <span class="str">r'\s*'</span> </span><span class="r"></span></p>
<p class="par run show_par"><span class="n"><a id="t19" href="#t19">19</a></span><span class="t"> <span class="key">if</span> <span class="nam">isinstance</span><span class="op">(</span><span class="nam">strings</span><span class="op">[</span><span class="num">0</span><span class="op">]</span><span class="op">,</span> <span class="nam">bytes</span><span class="op">)</span><span class="op">:</span> </span><span class="r"><span class="annotate short">19 ↛ 20</span><span class="annotate long">line 19 didn't jump to line 20, because the condition on line 19 was never true</span></span></p>
<p class="mis show_mis"><span class="n"><a id="t20" href="#t20">20</a></span><span class="t"> <span class="nam">pat</span> <span class="op">=</span> <span class="nam">pat</span><span class="op">.</span><span class="nam">encode</span><span class="op">(</span><span class="str">"utf-8"</span><span class="op">)</span> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t21" href="#t21">21</a></span><span class="t"> <span class="nam">prefix</span> <span class="op">=</span> <span class="nam">re</span><span class="op">.</span><span class="nam">match</span><span class="op">(</span><span class="nam">pat</span><span class="op">,</span> <span class="nam">strings</span><span class="op">[</span><span class="num">0</span><span class="op">]</span><span class="op">)</span><span class="op">.</span><span class="nam">group</span><span class="op">(</span><span class="num">0</span><span class="op">)</span> </span><span class="r"></span></p>
<p class="pln"><span class="n"><a id="t22" href="#t22">22</a></span><span class="t"> </span><span class="r"></span></p>
<p class="pln"><span class="n"><a id="t23" href="#t23">23</a></span><span class="t"> <span class="com"># Loop over the other strings, keeping only as much of</span> </span><span class="r"></span></p>
<p class="pln"><span class="n"><a id="t24" href="#t24">24</a></span><span class="t"> <span class="com"># the prefix as matches each string.</span> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t25" href="#t25">25</a></span><span class="t"> <span class="key">for</span> <span class="nam">s</span> <span class="key">in</span> <span class="nam">strings</span><span class="op">:</span> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t26" href="#t26">26</a></span><span class="t"> <span class="key">for</span> <span class="nam">i</span> <span class="key">in</span> <span class="nam">range</span><span class="op">(</span><span class="nam">len</span><span class="op">(</span><span class="nam">prefix</span><span class="op">)</span><span class="op">)</span><span class="op">:</span> </span><span class="r"></span></p>
<p class="par run show_par"><span class="n"><a id="t27" href="#t27">27</a></span><span class="t"> <span class="key">if</span> <span class="nam">prefix</span><span class="op">[</span><span class="nam">i</span><span class="op">]</span> <span class="op">!=</span> <span class="nam">s</span><span class="op">[</span><span class="nam">i</span><span class="op">]</span><span class="op">:</span> </span><span class="r"><span class="annotate short">27 ↛ 28</span><span class="annotate long">line 27 didn't jump to line 28, because the condition on line 27 was never true</span></span></p>
<p class="mis show_mis"><span class="n"><a id="t28" href="#t28">28</a></span><span class="t"> <span class="nam">prefix</span> <span class="op">=</span> <span class="nam">prefix</span><span class="op">[</span><span class="op">:</span><span class="nam">i</span><span class="op">]</span> </span><span class="r"></span></p>
<p class="mis show_mis"><span class="n"><a id="t29" href="#t29">29</a></span><span class="t"> <span class="key">break</span> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t30" href="#t30">30</a></span><span class="t"> <span class="key">return</span> <span class="nam">prefix</span> </span><span class="r"></span></p>
<p class="pln"><span class="n"><a id="t31" href="#t31">31</a></span><span class="t"> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t32" href="#t32">32</a></span><span class="t"><span class="key">def</span> <span class="nam">reindentBlock</span><span class="op">(</span><span class="nam">lines</span><span class="op">,</span> <span class="nam">newIndent</span><span class="op">=</span><span class="str">''</span><span class="op">)</span><span class="op">:</span> </span><span class="r"></span></p>
<p class="pln"><span class="n"><a id="t33" href="#t33">33</a></span><span class="t"> <span class="str">""" Take a block of text as a string or list of lines.</span> </span><span class="r"></span></p>
<p class="pln"><span class="n"><a id="t34" href="#t34">34</a></span><span class="t"><span class="str"> Remove any common whitespace indentation.</span> </span><span class="r"></span></p>
<p class="pln"><span class="n"><a id="t35" href="#t35">35</a></span><span class="t"><span class="str"> Re-indent using newIndent, and return it as a single string.</span> </span><span class="r"></span></p>
<p class="pln"><span class="n"><a id="t36" href="#t36">36</a></span><span class="t"><span class="str"> """</span> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t37" href="#t37">37</a></span><span class="t"> <span class="nam">sep</span><span class="op">,</span> <span class="nam">nothing</span> <span class="op">=</span> <span class="str">'\n'</span><span class="op">,</span> <span class="str">''</span> </span><span class="r"></span></p>
<p class="par run show_par"><span class="n"><a id="t38" href="#t38">38</a></span><span class="t"> <span class="key">if</span> <span class="nam">isinstance</span><span class="op">(</span><span class="nam">lines</span><span class="op">,</span> <span class="nam">bytes</span><span class="op">)</span><span class="op">:</span> </span><span class="r"><span class="annotate short">38 ↛ 39</span><span class="annotate long">line 38 didn't jump to line 39, because the condition on line 38 was never true</span></span></p>
<p class="mis show_mis"><span class="n"><a id="t39" href="#t39">39</a></span><span class="t"> <span class="nam">sep</span><span class="op">,</span> <span class="nam">nothing</span> <span class="op">=</span> <span class="str">b'\n'</span><span class="op">,</span> <span class="str">b''</span> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t40" href="#t40">40</a></span><span class="t"> <span class="key">if</span> <span class="nam">isinstance</span><span class="op">(</span><span class="nam">lines</span><span class="op">,</span> <span class="op">(</span><span class="nam">bytes</span><span class="op">,</span> <span class="nam">str</span><span class="op">)</span><span class="op">)</span><span class="op">:</span> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t41" href="#t41">41</a></span><span class="t"> <span class="nam">lines</span> <span class="op">=</span> <span class="nam">lines</span><span class="op">.</span><span class="nam">split</span><span class="op">(</span><span class="nam">sep</span><span class="op">)</span> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t42" href="#t42">42</a></span><span class="t"> <span class="nam">oldIndent</span> <span class="op">=</span> <span class="nam">whitePrefix</span><span class="op">(</span><span class="nam">lines</span><span class="op">)</span> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t43" href="#t43">43</a></span><span class="t"> <span class="nam">outLines</span> <span class="op">=</span> <span class="op">[</span><span class="op">]</span> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t44" href="#t44">44</a></span><span class="t"> <span class="key">for</span> <span class="nam">l</span> <span class="key">in</span> <span class="nam">lines</span><span class="op">:</span> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t45" href="#t45">45</a></span><span class="t"> <span class="key">if</span> <span class="nam">oldIndent</span><span class="op">:</span> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t46" href="#t46">46</a></span><span class="t"> <span class="nam">l</span> <span class="op">=</span> <span class="nam">l</span><span class="op">.</span><span class="nam">replace</span><span class="op">(</span><span class="nam">oldIndent</span><span class="op">,</span> <span class="nam">nothing</span><span class="op">,</span> <span class="num">1</span><span class="op">)</span> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t47" href="#t47">47</a></span><span class="t"> <span class="key">if</span> <span class="nam">l</span> <span class="key">and</span> <span class="nam">newIndent</span><span class="op">:</span> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t48" href="#t48">48</a></span><span class="t"> <span class="nam">l</span> <span class="op">=</span> <span class="nam">newIndent</span> <span class="op">+</span> <span class="nam">l</span> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t49" href="#t49">49</a></span><span class="t"> <span class="nam">outLines</span><span class="op">.</span><span class="nam">append</span><span class="op">(</span><span class="nam">l</span><span class="op">)</span> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t50" href="#t50">50</a></span><span class="t"> <span class="key">return</span> <span class="nam">sep</span><span class="op">.</span><span class="nam">join</span><span class="op">(</span><span class="nam">outLines</span><span class="op">)</span> </span><span class="r"></span></p>
<p class="pln"><span class="n"><a id="t51" href="#t51">51</a></span><span class="t"> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t52" href="#t52">52</a></span><span class="t"><span class="key">def</span> <span class="nam">commonPrefix</span><span class="op">(</span><span class="nam">strings</span><span class="op">)</span><span class="op">:</span> </span><span class="r"></span></p>
<p class="pln"><span class="n"><a id="t53" href="#t53">53</a></span><span class="t"> <span class="str">""" Find the longest string that is a prefix of all the strings.</span> </span><span class="r"></span></p>
<p class="pln"><span class="n"><a id="t54" href="#t54">54</a></span><span class="t"><span class="str"> """</span> </span><span class="r"></span></p>
<p class="par run show_par"><span class="n"><a id="t55" href="#t55">55</a></span><span class="t"> <span class="key">if</span> <span class="key">not</span> <span class="nam">strings</span><span class="op">:</span> </span><span class="r"><span class="annotate short">55 ↛ 56</span><span class="annotate long">line 55 didn't jump to line 56, because the condition on line 55 was never true</span></span></p>
<p class="mis show_mis"><span class="n"><a id="t56" href="#t56">56</a></span><span class="t"> <span class="key">return</span> <span class="str">''</span> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t57" href="#t57">57</a></span><span class="t"> <span class="nam">prefix</span> <span class="op">=</span> <span class="nam">strings</span><span class="op">[</span><span class="num">0</span><span class="op">]</span> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t58" href="#t58">58</a></span><span class="t"> <span class="key">for</span> <span class="nam">s</span> <span class="key">in</span> <span class="nam">strings</span><span class="op">:</span> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t59" href="#t59">59</a></span><span class="t"> <span class="key">if</span> <span class="nam">len</span><span class="op">(</span><span class="nam">s</span><span class="op">)</span> <span class="op"><</span> <span class="nam">len</span><span class="op">(</span><span class="nam">prefix</span><span class="op">)</span><span class="op">:</span> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t60" href="#t60">60</a></span><span class="t"> <span class="nam">prefix</span> <span class="op">=</span> <span class="nam">prefix</span><span class="op">[</span><span class="op">:</span><span class="nam">len</span><span class="op">(</span><span class="nam">s</span><span class="op">)</span><span class="op">]</span> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t61" href="#t61">61</a></span><span class="t"> <span class="key">if</span> <span class="key">not</span> <span class="nam">prefix</span><span class="op">:</span> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t62" href="#t62">62</a></span><span class="t"> <span class="key">return</span> <span class="str">''</span> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t63" href="#t63">63</a></span><span class="t"> <span class="key">for</span> <span class="nam">i</span> <span class="key">in</span> <span class="nam">range</span><span class="op">(</span><span class="nam">len</span><span class="op">(</span><span class="nam">prefix</span><span class="op">)</span><span class="op">)</span><span class="op">:</span> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t64" href="#t64">64</a></span><span class="t"> <span class="key">if</span> <span class="nam">prefix</span><span class="op">[</span><span class="nam">i</span><span class="op">]</span> <span class="op">!=</span> <span class="nam">s</span><span class="op">[</span><span class="nam">i</span><span class="op">]</span><span class="op">:</span> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t65" href="#t65">65</a></span><span class="t"> <span class="nam">prefix</span> <span class="op">=</span> <span class="nam">prefix</span><span class="op">[</span><span class="op">:</span><span class="nam">i</span><span class="op">]</span> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t66" href="#t66">66</a></span><span class="t"> <span class="key">break</span> </span><span class="r"></span></p>
<p class="run"><span class="n"><a id="t67" href="#t67">67</a></span><span class="t"> <span class="key">return</span> <span class="nam">prefix</span> </span><span class="r"></span></p>
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