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50  <h1>Source code for sas.data_util.registry</h1><div class="highlight"><pre>
51<span class="c"># This program is public domain</span>
52<span class="sd">&quot;&quot;&quot;</span>
53<span class="sd">File extension registry.</span>
54
55<span class="sd">This provides routines for opening files based on extension,</span>
56<span class="sd">and registers the built-in file extensions.</span>
57<span class="sd">&quot;&quot;&quot;</span>
58
59<span class="kn">import</span> <span class="nn">os.path</span>
60
61<div class="viewcode-block" id="ExtensionRegistry"><a class="viewcode-back" href="../../../dev/api/sas.data_util.html#sas.data_util.registry.ExtensionRegistry">[docs]</a><span class="k">class</span> <span class="nc">ExtensionRegistry</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
62    <span class="sd">&quot;&quot;&quot;</span>
63<span class="sd">    Associate a file loader with an extension.</span>
64
65<span class="sd">    Note that there may be multiple loaders for the same extension.</span>
66
67<span class="sd">    Example: ::</span>
68
69<span class="sd">        registry = ExtensionRegistry()</span>
70
71<span class="sd">        # Add an association by setting an element</span>
72<span class="sd">        registry[&#39;.zip&#39;] = unzip</span>
73<span class="sd">        </span>
74<span class="sd">        # Multiple extensions for one loader</span>
75<span class="sd">        registry[&#39;.tgz&#39;] = untar</span>
76<span class="sd">        registry[&#39;.tar.gz&#39;] = untar</span>
77
78<span class="sd">        # Generic extensions to use after trying more specific extensions; </span>
79<span class="sd">        # these will be checked after the more specific extensions fail.</span>
80<span class="sd">        registry[&#39;.gz&#39;] = gunzip</span>
81
82<span class="sd">        # Multiple loaders for one extension</span>
83<span class="sd">        registry[&#39;.cx&#39;] = cx1</span>
84<span class="sd">        registry[&#39;.cx&#39;] = cx2</span>
85<span class="sd">        registry[&#39;.cx&#39;] = cx3</span>
86
87<span class="sd">        # Show registered extensions</span>
88<span class="sd">        print registry.extensions()</span>
89<span class="sd">        </span>
90<span class="sd">        # Can also register a format name for explicit control from caller</span>
91<span class="sd">        registry[&#39;cx3&#39;] = cx3</span>
92<span class="sd">        print registry.formats()</span>
93
94<span class="sd">        # Retrieve loaders for a file name</span>
95<span class="sd">        registry.lookup(&#39;hello.cx&#39;) -&gt; [cx3,cx2,cx1]</span>
96
97<span class="sd">        # Run loader on a filename</span>
98<span class="sd">        registry.load(&#39;hello.cx&#39;) -&gt;</span>
99<span class="sd">            try:</span>
100<span class="sd">                return cx3(&#39;hello.cx&#39;)</span>
101<span class="sd">            except:</span>
102<span class="sd">                try:</span>
103<span class="sd">                    return cx2(&#39;hello.cx&#39;)</span>
104<span class="sd">                except:</span>
105<span class="sd">                    return cx1(&#39;hello.cx&#39;)</span>
106
107<span class="sd">        # Load in a specific format ignoring extension</span>
108<span class="sd">        registry.load(&#39;hello.cx&#39;,format=&#39;cx3&#39;) -&gt;</span>
109<span class="sd">            return cx3(&#39;hello.cx&#39;)</span>
110<span class="sd">    &quot;&quot;&quot;</span>
111    <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="o">**</span><span class="n">kw</span><span class="p">):</span>
112        <span class="bp">self</span><span class="o">.</span><span class="n">loaders</span> <span class="o">=</span> <span class="p">{}</span>
113    <span class="k">def</span> <span class="nf">__setitem__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">ext</span><span class="p">,</span> <span class="n">loader</span><span class="p">):</span>
114        <span class="k">if</span> <span class="n">ext</span> <span class="ow">not</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">loaders</span><span class="p">:</span>
115            <span class="bp">self</span><span class="o">.</span><span class="n">loaders</span><span class="p">[</span><span class="n">ext</span><span class="p">]</span> <span class="o">=</span> <span class="p">[]</span>
116        <span class="bp">self</span><span class="o">.</span><span class="n">loaders</span><span class="p">[</span><span class="n">ext</span><span class="p">]</span><span class="o">.</span><span class="n">insert</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span><span class="n">loader</span><span class="p">)</span>
117    <span class="k">def</span> <span class="nf">__getitem__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">ext</span><span class="p">):</span>
118        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">loaders</span><span class="p">[</span><span class="n">ext</span><span class="p">]</span>
119    <span class="k">def</span> <span class="nf">__contains__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">ext</span><span class="p">):</span>
120        <span class="k">return</span> <span class="n">ext</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">loaders</span>
121<div class="viewcode-block" id="ExtensionRegistry.formats"><a class="viewcode-back" href="../../../dev/api/sas.data_util.html#sas.data_util.registry.ExtensionRegistry.formats">[docs]</a>    <span class="k">def</span> <span class="nf">formats</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
122        <span class="sd">&quot;&quot;&quot;</span>
123<span class="sd">        Return a sorted list of the registered formats.</span>
124<span class="sd">        &quot;&quot;&quot;</span>
125        <span class="n">names</span> <span class="o">=</span> <span class="p">[</span><span class="n">a</span> <span class="k">for</span> <span class="n">a</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">loaders</span><span class="o">.</span><span class="n">keys</span><span class="p">()</span> <span class="k">if</span> <span class="ow">not</span> <span class="n">a</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="s">&#39;.&#39;</span><span class="p">)]</span>
126        <span class="n">names</span><span class="o">.</span><span class="n">sort</span><span class="p">()</span>
127        <span class="k">return</span> <span class="n">names</span></div>
128<div class="viewcode-block" id="ExtensionRegistry.extensions"><a class="viewcode-back" href="../../../dev/api/sas.data_util.html#sas.data_util.registry.ExtensionRegistry.extensions">[docs]</a>    <span class="k">def</span> <span class="nf">extensions</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
129        <span class="sd">&quot;&quot;&quot;</span>
130<span class="sd">        Return a sorted list of registered extensions.</span>
131<span class="sd">        &quot;&quot;&quot;</span>
132        <span class="n">exts</span> <span class="o">=</span> <span class="p">[</span><span class="n">a</span> <span class="k">for</span> <span class="n">a</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">loaders</span><span class="o">.</span><span class="n">keys</span><span class="p">()</span> <span class="k">if</span> <span class="n">a</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="s">&#39;.&#39;</span><span class="p">)]</span>
133        <span class="n">exts</span><span class="o">.</span><span class="n">sort</span><span class="p">()</span>
134        <span class="k">return</span> <span class="n">exts</span></div>
135<div class="viewcode-block" id="ExtensionRegistry.lookup"><a class="viewcode-back" href="../../../dev/api/sas.data_util.html#sas.data_util.registry.ExtensionRegistry.lookup">[docs]</a>    <span class="k">def</span> <span class="nf">lookup</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">path</span><span class="p">):</span>
136        <span class="sd">&quot;&quot;&quot;</span>
137<span class="sd">        Return the loader associated with the file type of path.</span>
138<span class="sd">        </span>
139<span class="sd">        Raises ValueError if file type is not known.</span>
140<span class="sd">        &quot;&quot;&quot;</span>       
141        <span class="c"># Find matching extensions</span>
142        <span class="n">extlist</span> <span class="o">=</span> <span class="p">[</span><span class="n">ext</span> <span class="k">for</span> <span class="n">ext</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">extensions</span><span class="p">()</span> <span class="k">if</span> <span class="n">path</span><span class="o">.</span><span class="n">endswith</span><span class="p">(</span><span class="n">ext</span><span class="p">)]</span>
143        <span class="c"># Sort matching extensions by decreasing order of length</span>
144        <span class="n">extlist</span><span class="o">.</span><span class="n">sort</span><span class="p">(</span><span class="k">lambda</span> <span class="n">a</span><span class="p">,</span><span class="n">b</span><span class="p">:</span> <span class="nb">len</span><span class="p">(</span><span class="n">a</span><span class="p">)</span><span class="o">&lt;</span><span class="nb">len</span><span class="p">(</span><span class="n">b</span><span class="p">))</span>
145        <span class="c"># Combine loaders for matching extensions into one big list</span>
146        <span class="n">loaders</span> <span class="o">=</span> <span class="p">[]</span>
147        <span class="k">for</span> <span class="n">L</span> <span class="ow">in</span> <span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">loaders</span><span class="p">[</span><span class="n">ext</span><span class="p">]</span> <span class="k">for</span> <span class="n">ext</span> <span class="ow">in</span> <span class="n">extlist</span><span class="p">]:</span>
148            <span class="n">loaders</span><span class="o">.</span><span class="n">extend</span><span class="p">(</span><span class="n">L</span><span class="p">)</span>
149        <span class="c"># Remove duplicates if they exist</span>
150        <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">loaders</span><span class="p">)</span> <span class="o">!=</span> <span class="nb">len</span><span class="p">(</span><span class="nb">set</span><span class="p">(</span><span class="n">loaders</span><span class="p">)):</span>
151            <span class="n">result</span> <span class="o">=</span> <span class="p">[]</span>
152            <span class="k">for</span> <span class="n">L</span> <span class="ow">in</span> <span class="n">loaders</span><span class="p">:</span>
153                <span class="k">if</span> <span class="n">L</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">result</span><span class="p">:</span> <span class="n">result</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">L</span><span class="p">)</span>
154            <span class="n">loaders</span> <span class="o">=</span> <span class="n">L</span>
155        <span class="c"># Raise an error if there are no matching extensions</span>
156        <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">loaders</span><span class="p">)</span> <span class="o">==</span> <span class="mi">0</span><span class="p">:</span>
157            <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">,</span> <span class="s">&quot;Unknown file type for &quot;</span><span class="o">+</span><span class="n">path</span>
158        <span class="c"># All done</span>
159        <span class="k">return</span> <span class="n">loaders</span></div>
160<div class="viewcode-block" id="ExtensionRegistry.load"><a class="viewcode-back" href="../../../dev/api/sas.data_util.html#sas.data_util.registry.ExtensionRegistry.load">[docs]</a>    <span class="k">def</span> <span class="nf">load</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">path</span><span class="p">,</span> <span class="n">format</span><span class="o">=</span><span class="bp">None</span><span class="p">):</span>
161        <span class="sd">&quot;&quot;&quot;</span>
162<span class="sd">        Call the loader for the file type of path.</span>
163
164<span class="sd">        Raises ValueError if no loader is available.</span>
165<span class="sd">        Raises KeyError if format is not available.</span>
166<span class="sd">        May raise a loader-defined exception if loader fails.        </span>
167<span class="sd">        &quot;&quot;&quot;</span>
168        <span class="k">if</span> <span class="n">format</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
169            <span class="n">loaders</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">lookup</span><span class="p">(</span><span class="n">path</span><span class="p">)</span>
170        <span class="k">else</span><span class="p">:</span>
171            <span class="n">loaders</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">loaders</span><span class="p">[</span><span class="n">format</span><span class="p">]</span>
172        <span class="k">for</span> <span class="n">fn</span> <span class="ow">in</span> <span class="n">loaders</span><span class="p">:</span>
173            <span class="k">try</span><span class="p">:</span>
174                <span class="k">return</span> <span class="n">fn</span><span class="p">(</span><span class="n">path</span><span class="p">)</span>
175            <span class="k">except</span><span class="p">:</span>
176                <span class="k">pass</span> <span class="c"># give other loaders a chance to succeed</span>
177        <span class="c"># If we get here it is because all loaders failed</span>
178        <span class="k">raise</span> <span class="c"># reraises last exception</span>
179</div></div>
180<div class="viewcode-block" id="test"><a class="viewcode-back" href="../../../dev/api/sas.data_util.html#sas.data_util.registry.test">[docs]</a><span class="k">def</span> <span class="nf">test</span><span class="p">():</span>
181    <span class="n">reg</span> <span class="o">=</span> <span class="n">ExtensionRegistry</span><span class="p">()</span>
182    <span class="k">class</span> <span class="nc">CxError</span><span class="p">(</span><span class="ne">Exception</span><span class="p">):</span> <span class="k">pass</span>
183    <span class="k">def</span> <span class="nf">cx</span><span class="p">(</span><span class="nb">file</span><span class="p">):</span> <span class="k">return</span> <span class="s">&#39;cx&#39;</span>
184    <span class="k">def</span> <span class="nf">new_cx</span><span class="p">(</span><span class="nb">file</span><span class="p">):</span> <span class="k">return</span> <span class="s">&#39;new_cx&#39;</span>
185    <span class="k">def</span> <span class="nf">fail_cx</span><span class="p">(</span><span class="nb">file</span><span class="p">):</span> <span class="k">raise</span> <span class="n">CxError</span>
186    <span class="k">def</span> <span class="nf">cat</span><span class="p">(</span><span class="nb">file</span><span class="p">):</span> <span class="k">return</span> <span class="s">&#39;cat&#39;</span>
187    <span class="k">def</span> <span class="nf">gunzip</span><span class="p">(</span><span class="nb">file</span><span class="p">):</span> <span class="k">return</span> <span class="s">&#39;gunzip&#39;</span>
188    <span class="n">reg</span><span class="p">[</span><span class="s">&#39;.cx&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="n">cx</span>
189    <span class="n">reg</span><span class="p">[</span><span class="s">&#39;.cx1&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="n">cx</span>
190    <span class="n">reg</span><span class="p">[</span><span class="s">&#39;.cx&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="n">new_cx</span>
191    <span class="n">reg</span><span class="p">[</span><span class="s">&#39;.gz&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="n">gunzip</span>
192    <span class="n">reg</span><span class="p">[</span><span class="s">&#39;.cx.gz&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="n">new_cx</span>
193    <span class="n">reg</span><span class="p">[</span><span class="s">&#39;.cx1.gz&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="n">fail_cx</span>
194    <span class="n">reg</span><span class="p">[</span><span class="s">&#39;.cx1&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="n">fail_cx</span>
195    <span class="n">reg</span><span class="p">[</span><span class="s">&#39;.cx2&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="n">fail_cx</span>
196    <span class="n">reg</span><span class="p">[</span><span class="s">&#39;new_cx&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="n">new_cx</span>
197
198    <span class="c"># Two loaders associated with .cx</span>
199    <span class="k">assert</span> <span class="n">reg</span><span class="o">.</span><span class="n">lookup</span><span class="p">(</span><span class="s">&#39;hello.cx&#39;</span><span class="p">)</span> <span class="o">==</span> <span class="p">[</span><span class="n">new_cx</span><span class="p">,</span><span class="n">cx</span><span class="p">]</span>
200    <span class="c"># Make sure the last loader applies first</span>
201    <span class="k">assert</span> <span class="n">reg</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="s">&#39;hello.cx&#39;</span><span class="p">)</span> <span class="o">==</span> <span class="s">&#39;new_cx&#39;</span>
202    <span class="c"># Make sure the next loader applies if the first fails</span>
203    <span class="k">assert</span> <span class="n">reg</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="s">&#39;hello.cx1&#39;</span><span class="p">)</span> <span class="o">==</span> <span class="s">&#39;cx&#39;</span>
204    <span class="c"># Make sure the format override works</span>
205    <span class="k">assert</span> <span class="n">reg</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="s">&#39;hello.cx1&#39;</span><span class="p">,</span><span class="n">format</span><span class="o">=</span><span class="s">&#39;.cx.gz&#39;</span><span class="p">)</span> <span class="o">==</span> <span class="s">&#39;new_cx&#39;</span>
206    <span class="c"># Make sure the format override works</span>
207    <span class="k">assert</span> <span class="n">reg</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="s">&#39;hello.cx1&#39;</span><span class="p">,</span><span class="n">format</span><span class="o">=</span><span class="s">&#39;new_cx&#39;</span><span class="p">)</span> <span class="o">==</span> <span class="s">&#39;new_cx&#39;</span>
208    <span class="c"># Make sure the case of all loaders failing is correct</span>
209    <span class="k">try</span><span class="p">:</span>  <span class="n">reg</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="s">&#39;hello.cx2&#39;</span><span class="p">)</span>
210    <span class="k">except</span> <span class="n">CxError</span><span class="p">:</span> <span class="k">pass</span> <span class="c"># correct failure</span>
211    <span class="k">else</span><span class="p">:</span> <span class="k">raise</span> <span class="n">AssertError</span><span class="p">,</span><span class="s">&quot;Incorrect error on load failure&quot;</span>
212    <span class="c"># Make sure the case of no loaders fails correctly</span>
213    <span class="k">try</span><span class="p">:</span> <span class="n">reg</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="s">&#39;hello.missing&#39;</span><span class="p">)</span>
214    <span class="k">except</span> <span class="ne">ValueError</span><span class="p">,</span><span class="n">msg</span><span class="p">:</span>
215        <span class="k">assert</span> <span class="nb">str</span><span class="p">(</span><span class="n">msg</span><span class="p">)</span><span class="o">==</span><span class="s">&quot;Unknown file type for hello.missing&quot;</span><span class="p">,</span><span class="s">&#39;Message: &lt;</span><span class="si">%s</span><span class="s">&gt;&#39;</span><span class="o">%</span><span class="p">(</span><span class="n">msg</span><span class="p">)</span>
216    <span class="k">else</span><span class="p">:</span> <span class="k">raise</span> <span class="n">AssertError</span><span class="p">,</span><span class="s">&quot;No error raised for missing extension&quot;</span>
217    <span class="k">assert</span> <span class="n">reg</span><span class="o">.</span><span class="n">formats</span><span class="p">()</span> <span class="o">==</span> <span class="p">[</span><span class="s">&#39;new_cx&#39;</span><span class="p">]</span>
218    <span class="k">assert</span> <span class="n">reg</span><span class="o">.</span><span class="n">extensions</span><span class="p">()</span> <span class="o">==</span> <span class="p">[</span><span class="s">&#39;.cx&#39;</span><span class="p">,</span><span class="s">&#39;.cx.gz&#39;</span><span class="p">,</span><span class="s">&#39;.cx1&#39;</span><span class="p">,</span><span class="s">&#39;.cx1.gz&#39;</span><span class="p">,</span><span class="s">&#39;.cx2&#39;</span><span class="p">,</span><span class="s">&#39;.gz&#39;</span><span class="p">]</span>
219    <span class="c"># make sure that it supports multiple &#39;.&#39; in filename</span>
220    <span class="k">assert</span> <span class="n">reg</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="s">&#39;hello.extra.cx1&#39;</span><span class="p">)</span> <span class="o">==</span> <span class="s">&#39;cx&#39;</span>
221    <span class="k">assert</span> <span class="n">reg</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="s">&#39;hello.gz&#39;</span><span class="p">)</span> <span class="o">==</span> <span class="s">&#39;gunzip&#39;</span>
222    <span class="k">assert</span> <span class="n">reg</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="s">&#39;hello.cx1.gz&#39;</span><span class="p">)</span> <span class="o">==</span> <span class="s">&#39;gunzip&#39;</span> <span class="c"># Since .cx1.gz fails</span>
223</div>
224<span class="k">if</span> <span class="n">__name__</span> <span class="o">==</span> <span class="s">&quot;__main__&quot;</span><span class="p">:</span> <span class="n">test</span><span class="p">()</span>
225</pre></div>
226
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