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50  <h1>Source code for sas.data_util.pathutils</h1><div class="highlight"><pre>
51<span class="c">#!/usr/bin/env python</span>
52<span class="sd">&quot;&quot;&quot;</span>
53<span class="sd">Utilities for path manipulation. Not to be confused with the pathutils module</span>
54<span class="sd">from the pythonutils package (http://groups.google.com/group/pythonutils).</span>
55<span class="sd">&quot;&quot;&quot;</span>
56
57<span class="c"># NOTE: If enough of _that_ pathutils functionality is required, we can switch</span>
58<span class="c"># this module for that one.</span>
59
60<span class="c"># TODO: Make algorithm more robust and complete; consider using abspath.</span>
61
62<span class="n">__all__</span> <span class="o">=</span> <span class="p">[</span><span class="s">&#39;relpath&#39;</span><span class="p">]</span>
63
64<span class="kn">from</span> <span class="nn">os.path</span> <span class="kn">import</span> <span class="n">join</span>
65<span class="kn">from</span> <span class="nn">os.path</span> <span class="kn">import</span> <span class="n">sep</span>
66
67<div class="viewcode-block" id="relpath"><a class="viewcode-back" href="../../../dev/api/sas.data_util.html#sas.data_util.pathutils.relpath">[docs]</a><span class="k">def</span> <span class="nf">relpath</span><span class="p">(</span><span class="n">p1</span><span class="p">,</span> <span class="n">p2</span><span class="p">):</span>
68    <span class="sd">&quot;&quot;&quot;Compute the relative path of p1 with respect to p2.&quot;&quot;&quot;</span>
69
70    <span class="k">def</span> <span class="nf">commonpath</span><span class="p">(</span><span class="n">L1</span><span class="p">,</span> <span class="n">L2</span><span class="p">,</span> <span class="n">common</span><span class="o">=</span><span class="p">[]):</span>
71        <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">L1</span><span class="p">)</span> <span class="o">&lt;</span> <span class="mi">1</span><span class="p">:</span> <span class="k">return</span> <span class="p">(</span><span class="n">common</span><span class="p">,</span> <span class="n">L1</span><span class="p">,</span> <span class="n">L2</span><span class="p">)</span>
72        <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">L2</span><span class="p">)</span> <span class="o">&lt;</span> <span class="mi">1</span><span class="p">:</span> <span class="k">return</span> <span class="p">(</span><span class="n">common</span><span class="p">,</span> <span class="n">L1</span><span class="p">,</span> <span class="n">L2</span><span class="p">)</span>
73        <span class="k">if</span> <span class="n">L1</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">!=</span> <span class="n">L2</span><span class="p">[</span><span class="mi">0</span><span class="p">]:</span> <span class="k">return</span> <span class="p">(</span><span class="n">common</span><span class="p">,</span> <span class="n">L1</span><span class="p">,</span> <span class="n">L2</span><span class="p">)</span>
74        <span class="k">return</span> <span class="n">commonpath</span><span class="p">(</span><span class="n">L1</span><span class="p">[</span><span class="mi">1</span><span class="p">:],</span> <span class="n">L2</span><span class="p">[</span><span class="mi">1</span><span class="p">:],</span> <span class="n">common</span><span class="o">=</span><span class="n">common</span><span class="o">+</span><span class="p">[</span><span class="n">L1</span><span class="p">[</span><span class="mi">0</span><span class="p">]])</span>
75
76    <span class="c"># if the strings are equal, then return &quot;.&quot;</span>
77    <span class="k">if</span> <span class="n">p1</span> <span class="o">==</span> <span class="n">p2</span><span class="p">:</span> <span class="k">return</span> <span class="s">&quot;.&quot;</span>
78    <span class="p">(</span><span class="n">common</span><span class="p">,</span><span class="n">L1</span><span class="p">,</span><span class="n">L2</span><span class="p">)</span> <span class="o">=</span> <span class="n">commonpath</span><span class="p">(</span><span class="n">p2</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="n">sep</span><span class="p">),</span> <span class="n">p1</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="n">sep</span><span class="p">))</span>
79    <span class="c"># if there is nothing in common, then return an empty string</span>
80    <span class="k">if</span> <span class="ow">not</span> <span class="n">common</span><span class="p">:</span> <span class="k">return</span> <span class="s">&quot;&quot;</span>
81    <span class="c"># otherwise, replace the common pieces with &quot;../&quot; (or &quot;..\&quot;)</span>
82    <span class="n">p</span> <span class="o">=</span> <span class="p">[(</span><span class="s">&quot;..&quot;</span><span class="o">+</span><span class="n">sep</span><span class="p">)</span> <span class="o">*</span> <span class="nb">len</span><span class="p">(</span><span class="n">L1</span><span class="p">)]</span> <span class="o">+</span> <span class="n">L2</span>
83    <span class="k">return</span> <span class="n">join</span><span class="p">(</span><span class="o">*</span><span class="n">p</span><span class="p">)</span>
84</div>
85<span class="k">def</span> <span class="nf">test</span><span class="p">():</span>
86    <span class="n">p1</span> <span class="o">=</span> <span class="n">sep</span><span class="o">.</span><span class="n">join</span><span class="p">([</span><span class="s">&quot;a&quot;</span><span class="p">,</span><span class="s">&quot;b&quot;</span><span class="p">,</span><span class="s">&quot;c&quot;</span><span class="p">,</span><span class="s">&quot;d&quot;</span><span class="p">])</span>
87    <span class="n">p2</span> <span class="o">=</span> <span class="n">sep</span><span class="o">.</span><span class="n">join</span><span class="p">([</span><span class="s">&quot;a&quot;</span><span class="p">,</span><span class="s">&quot;b&quot;</span><span class="p">,</span><span class="s">&quot;c1&quot;</span><span class="p">,</span><span class="s">&quot;d1&quot;</span><span class="p">])</span>
88    <span class="n">p3</span> <span class="o">=</span> <span class="n">sep</span><span class="o">.</span><span class="n">join</span><span class="p">([</span><span class="s">&quot;a&quot;</span><span class="p">,</span><span class="s">&quot;b&quot;</span><span class="p">,</span><span class="s">&quot;c&quot;</span><span class="p">,</span><span class="s">&quot;d&quot;</span><span class="p">,</span><span class="s">&quot;e&quot;</span><span class="p">])</span>
89    <span class="n">p4</span> <span class="o">=</span> <span class="n">sep</span><span class="o">.</span><span class="n">join</span><span class="p">([</span><span class="s">&quot;a&quot;</span><span class="p">,</span><span class="s">&quot;b&quot;</span><span class="p">,</span><span class="s">&quot;c&quot;</span><span class="p">,</span><span class="s">&quot;d1&quot;</span><span class="p">,</span><span class="s">&quot;e&quot;</span><span class="p">])</span>
90    <span class="n">p5</span> <span class="o">=</span> <span class="n">sep</span><span class="o">.</span><span class="n">join</span><span class="p">([</span><span class="s">&quot;w&quot;</span><span class="p">,</span><span class="s">&quot;x&quot;</span><span class="p">,</span><span class="s">&quot;y&quot;</span><span class="p">,</span><span class="s">&quot;z&quot;</span><span class="p">])</span>
91
92    <span class="k">assert</span> <span class="n">relpath</span><span class="p">(</span><span class="n">p1</span><span class="p">,</span> <span class="n">p1</span><span class="p">)</span> <span class="o">==</span> <span class="s">&quot;.&quot;</span>
93    <span class="k">assert</span> <span class="n">relpath</span><span class="p">(</span><span class="n">p2</span><span class="p">,</span> <span class="n">p1</span><span class="p">)</span> <span class="o">==</span>  <span class="n">sep</span><span class="o">.</span><span class="n">join</span><span class="p">([</span><span class="s">&quot;..&quot;</span><span class="p">,</span> <span class="s">&quot;..&quot;</span><span class="p">,</span> <span class="s">&quot;c1&quot;</span><span class="p">,</span> <span class="s">&quot;d1&quot;</span><span class="p">])</span>
94    <span class="k">assert</span> <span class="n">relpath</span><span class="p">(</span><span class="n">p3</span><span class="p">,</span> <span class="n">p1</span><span class="p">)</span> <span class="o">==</span> <span class="s">&quot;e&quot;</span>
95    <span class="k">assert</span> <span class="n">relpath</span><span class="p">(</span><span class="n">p4</span><span class="p">,</span> <span class="n">p1</span><span class="p">)</span> <span class="o">==</span>  <span class="n">sep</span><span class="o">.</span><span class="n">join</span><span class="p">([</span><span class="s">&quot;..&quot;</span><span class="p">,</span> <span class="s">&quot;d1&quot;</span><span class="p">,</span> <span class="s">&quot;e&quot;</span><span class="p">])</span>
96    <span class="k">assert</span> <span class="n">relpath</span><span class="p">(</span><span class="n">p5</span><span class="p">,</span> <span class="n">p1</span><span class="p">)</span> <span class="o">==</span> <span class="s">&quot;&quot;</span>
97
98<span class="k">if</span> <span class="n">__name__</span> <span class="o">==</span> <span class="s">&#39;__main__&#39;</span><span class="p">:</span>
99    <span class="n">test</span><span class="p">()</span>
100</pre></div>
101
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