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<h1>Source code for django.template.loader</h1><div class="highlight"><pre>
<span class="c"># Wrapper for loading templates from storage of some sort (e.g. filesystem, database).</span>
<span class="c">#</span>
<span class="c"># This uses the TEMPLATE_LOADERS setting, which is a list of loaders to use.</span>
<span class="c"># Each loader is expected to have this interface:</span>
<span class="c">#</span>
<span class="c"># callable(name, dirs=[])</span>
<span class="c">#</span>
<span class="c"># name is the template name.</span>
<span class="c"># dirs is an optional list of directories to search instead of TEMPLATE_DIRS.</span>
<span class="c">#</span>
<span class="c"># The loader should return a tuple of (template_source, path). The path returned</span>
<span class="c"># might be shown to the user for debugging purposes, so it should identify where</span>
<span class="c"># the template was loaded from.</span>
<span class="c">#</span>
<span class="c"># A loader may return an already-compiled template instead of the actual</span>
<span class="c"># template source. In that case the path returned should be None, since the</span>
<span class="c"># path information is associated with the template during the compilation,</span>
<span class="c"># which has already been done.</span>
<span class="c">#</span>
<span class="c"># Each loader should have an "is_usable" attribute set. This is a boolean that</span>
<span class="c"># specifies whether the loader can be used in this Python installation. Each</span>
<span class="c"># loader is responsible for setting this when it's initialized.</span>
<span class="c">#</span>
<span class="c"># For example, the eggs loader (which is capable of loading templates from</span>
<span class="c"># Python eggs) sets is_usable to False if the "pkg_resources" module isn't</span>
<span class="c"># installed, because pkg_resources is necessary to read eggs.</span>
<span class="kn">from</span> <span class="nn">django.core.exceptions</span> <span class="kn">import</span> <span class="n">ImproperlyConfigured</span>
<span class="kn">from</span> <span class="nn">django.template.base</span> <span class="kn">import</span> <span class="n">Origin</span><span class="p">,</span> <span class="n">Template</span><span class="p">,</span> <span class="n">Context</span><span class="p">,</span> <span class="n">TemplateDoesNotExist</span><span class="p">,</span> <span class="n">add_to_builtins</span>
<span class="kn">from</span> <span class="nn">django.conf</span> <span class="kn">import</span> <span class="n">settings</span>
<span class="kn">from</span> <span class="nn">django.utils.module_loading</span> <span class="kn">import</span> <span class="n">import_by_path</span>
<span class="kn">from</span> <span class="nn">django.utils</span> <span class="kn">import</span> <span class="n">six</span>
<span class="n">template_source_loaders</span> <span class="o">=</span> <span class="bp">None</span>
<span class="k">class</span> <span class="nc">BaseLoader</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="n">is_usable</span> <span class="o">=</span> <span class="bp">False</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="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="k">pass</span>
<span class="k">def</span> <span class="nf">__call__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">template_name</span><span class="p">,</span> <span class="n">template_dirs</span><span class="o">=</span><span class="bp">None</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">load_template</span><span class="p">(</span><span class="n">template_name</span><span class="p">,</span> <span class="n">template_dirs</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">load_template</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">template_name</span><span class="p">,</span> <span class="n">template_dirs</span><span class="o">=</span><span class="bp">None</span><span class="p">):</span>
<span class="n">source</span><span class="p">,</span> <span class="n">display_name</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">load_template_source</span><span class="p">(</span><span class="n">template_name</span><span class="p">,</span> <span class="n">template_dirs</span><span class="p">)</span>
<span class="n">origin</span> <span class="o">=</span> <span class="n">make_origin</span><span class="p">(</span><span class="n">display_name</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">load_template_source</span><span class="p">,</span> <span class="n">template_name</span><span class="p">,</span> <span class="n">template_dirs</span><span class="p">)</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">template</span> <span class="o">=</span> <span class="n">get_template_from_string</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">origin</span><span class="p">,</span> <span class="n">template_name</span><span class="p">)</span>
<span class="k">return</span> <span class="n">template</span><span class="p">,</span> <span class="bp">None</span>
<span class="k">except</span> <span class="n">TemplateDoesNotExist</span><span class="p">:</span>
<span class="c"># If compiling the template we found raises TemplateDoesNotExist, back off to</span>
<span class="c"># returning the source and display name for the template we were asked to load.</span>
<span class="c"># This allows for correct identification (later) of the actual template that does</span>
<span class="c"># not exist.</span>
<span class="k">return</span> <span class="n">source</span><span class="p">,</span> <span class="n">display_name</span>
<span class="k">def</span> <span class="nf">load_template_source</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">template_name</span><span class="p">,</span> <span class="n">template_dirs</span><span class="o">=</span><span class="bp">None</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Returns a tuple containing the source and origin for the given template</span>
<span class="sd"> name.</span>
<span class="sd"> """</span>
<span class="k">raise</span> <span class="ne">NotImplementedError</span>
<span class="k">def</span> <span class="nf">reset</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Resets any state maintained by the loader instance (e.g., cached</span>
<span class="sd"> templates or cached loader modules).</span>
<span class="sd"> """</span>
<span class="k">pass</span>
<span class="k">class</span> <span class="nc">LoaderOrigin</span><span class="p">(</span><span class="n">Origin</span><span class="p">):</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="n">display_name</span><span class="p">,</span> <span class="n">loader</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="n">dirs</span><span class="p">):</span>
<span class="nb">super</span><span class="p">(</span><span class="n">LoaderOrigin</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">__init__</span><span class="p">(</span><span class="n">display_name</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">loader</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">loadname</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">dirs</span> <span class="o">=</span> <span class="n">loader</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="n">dirs</span>
<span class="k">def</span> <span class="nf">reload</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">loader</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">loadname</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">dirs</span><span class="p">)[</span><span class="mi">0</span><span class="p">]</span>
<span class="k">def</span> <span class="nf">make_origin</span><span class="p">(</span><span class="n">display_name</span><span class="p">,</span> <span class="n">loader</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="n">dirs</span><span class="p">):</span>
<span class="k">if</span> <span class="n">settings</span><span class="o">.</span><span class="n">TEMPLATE_DEBUG</span> <span class="ow">and</span> <span class="n">display_name</span><span class="p">:</span>
<span class="k">return</span> <span class="n">LoaderOrigin</span><span class="p">(</span><span class="n">display_name</span><span class="p">,</span> <span class="n">loader</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="n">dirs</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">return</span> <span class="bp">None</span>
<span class="k">def</span> <span class="nf">find_template_loader</span><span class="p">(</span><span class="n">loader</span><span class="p">):</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">loader</span><span class="p">,</span> <span class="p">(</span><span class="nb">tuple</span><span class="p">,</span> <span class="nb">list</span><span class="p">)):</span>
<span class="n">loader</span><span class="p">,</span> <span class="n">args</span> <span class="o">=</span> <span class="n">loader</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="n">loader</span><span class="p">[</span><span class="mi">1</span><span class="p">:]</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">args</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">loader</span><span class="p">,</span> <span class="n">six</span><span class="o">.</span><span class="n">string_types</span><span class="p">):</span>
<span class="n">TemplateLoader</span> <span class="o">=</span> <span class="n">import_by_path</span><span class="p">(</span><span class="n">loader</span><span class="p">)</span>
<span class="k">if</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">TemplateLoader</span><span class="p">,</span> <span class="s">'load_template_source'</span><span class="p">):</span>
<span class="n">func</span> <span class="o">=</span> <span class="n">TemplateLoader</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="c"># Try loading module the old way - string is full path to callable</span>
<span class="k">if</span> <span class="n">args</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ImproperlyConfigured</span><span class="p">(</span><span class="s">"Error importing template source loader </span><span class="si">%s</span><span class="s"> - can't pass arguments to function-based loader."</span> <span class="o">%</span> <span class="n">loader</span><span class="p">)</span>
<span class="n">func</span> <span class="o">=</span> <span class="n">TemplateLoader</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">func</span><span class="o">.</span><span class="n">is_usable</span><span class="p">:</span>
<span class="kn">import</span> <span class="nn">warnings</span>
<span class="n">warnings</span><span class="o">.</span><span class="n">warn</span><span class="p">(</span><span class="s">"Your TEMPLATE_LOADERS setting includes </span><span class="si">%r</span><span class="s">, but your Python installation doesn't support that type of template loading. Consider removing that line from TEMPLATE_LOADERS."</span> <span class="o">%</span> <span class="n">loader</span><span class="p">)</span>
<span class="k">return</span> <span class="bp">None</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">return</span> <span class="n">func</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ImproperlyConfigured</span><span class="p">(</span><span class="s">'Loader does not define a "load_template" callable template source loader'</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">find_template</span><span class="p">(</span><span class="n">name</span><span class="p">,</span> <span class="n">dirs</span><span class="o">=</span><span class="bp">None</span><span class="p">):</span>
<span class="c"># Calculate template_source_loaders the first time the function is executed</span>
<span class="c"># because putting this logic in the module-level namespace may cause</span>
<span class="c"># circular import errors. See Django ticket #1292.</span>
<span class="k">global</span> <span class="n">template_source_loaders</span>
<span class="k">if</span> <span class="n">template_source_loaders</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
<span class="n">loaders</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">for</span> <span class="n">loader_name</span> <span class="ow">in</span> <span class="n">settings</span><span class="o">.</span><span class="n">TEMPLATE_LOADERS</span><span class="p">:</span>
<span class="n">loader</span> <span class="o">=</span> <span class="n">find_template_loader</span><span class="p">(</span><span class="n">loader_name</span><span class="p">)</span>
<span class="k">if</span> <span class="n">loader</span> <span class="ow">is</span> <span class="ow">not</span> <span class="bp">None</span><span class="p">:</span>
<span class="n">loaders</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">loader</span><span class="p">)</span>
<span class="n">template_source_loaders</span> <span class="o">=</span> <span class="nb">tuple</span><span class="p">(</span><span class="n">loaders</span><span class="p">)</span>
<span class="k">for</span> <span class="n">loader</span> <span class="ow">in</span> <span class="n">template_source_loaders</span><span class="p">:</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">source</span><span class="p">,</span> <span class="n">display_name</span> <span class="o">=</span> <span class="n">loader</span><span class="p">(</span><span class="n">name</span><span class="p">,</span> <span class="n">dirs</span><span class="p">)</span>
<span class="k">return</span> <span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">make_origin</span><span class="p">(</span><span class="n">display_name</span><span class="p">,</span> <span class="n">loader</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="n">dirs</span><span class="p">))</span>
<span class="k">except</span> <span class="n">TemplateDoesNotExist</span><span class="p">:</span>
<span class="k">pass</span>
<span class="k">raise</span> <span class="n">TemplateDoesNotExist</span><span class="p">(</span><span class="n">name</span><span class="p">)</span>
<div class="viewcode-block" id="get_template"><a class="viewcode-back" href="../../../ref/templates/api.html#django.template.loader.get_template">[docs]</a><span class="k">def</span> <span class="nf">get_template</span><span class="p">(</span><span class="n">template_name</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Returns a compiled Template object for the given template name,</span>
<span class="sd"> handling template inheritance recursively.</span>
<span class="sd"> """</span>
<span class="n">template</span><span class="p">,</span> <span class="n">origin</span> <span class="o">=</span> <span class="n">find_template</span><span class="p">(</span><span class="n">template_name</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">template</span><span class="p">,</span> <span class="s">'render'</span><span class="p">):</span>
<span class="c"># template needs to be compiled</span>
<span class="n">template</span> <span class="o">=</span> <span class="n">get_template_from_string</span><span class="p">(</span><span class="n">template</span><span class="p">,</span> <span class="n">origin</span><span class="p">,</span> <span class="n">template_name</span><span class="p">)</span>
<span class="k">return</span> <span class="n">template</span>
</div>
<span class="k">def</span> <span class="nf">get_template_from_string</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">origin</span><span class="o">=</span><span class="bp">None</span><span class="p">,</span> <span class="n">name</span><span class="o">=</span><span class="bp">None</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Returns a compiled Template object for the given template code,</span>
<span class="sd"> handling template inheritance recursively.</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="n">Template</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">origin</span><span class="p">,</span> <span class="n">name</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">render_to_string</span><span class="p">(</span><span class="n">template_name</span><span class="p">,</span> <span class="n">dictionary</span><span class="o">=</span><span class="bp">None</span><span class="p">,</span> <span class="n">context_instance</span><span class="o">=</span><span class="bp">None</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Loads the given template_name and renders it with the given dictionary as</span>
<span class="sd"> context. The template_name may be a string to load a single template using</span>
<span class="sd"> get_template, or it may be a tuple to use select_template to find one of</span>
<span class="sd"> the templates in the list. Returns a string.</span>
<span class="sd"> """</span>
<span class="n">dictionary</span> <span class="o">=</span> <span class="n">dictionary</span> <span class="ow">or</span> <span class="p">{}</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">template_name</span><span class="p">,</span> <span class="p">(</span><span class="nb">list</span><span class="p">,</span> <span class="nb">tuple</span><span class="p">)):</span>
<span class="n">t</span> <span class="o">=</span> <span class="n">select_template</span><span class="p">(</span><span class="n">template_name</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">t</span> <span class="o">=</span> <span class="n">get_template</span><span class="p">(</span><span class="n">template_name</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">context_instance</span><span class="p">:</span>
<span class="k">return</span> <span class="n">t</span><span class="o">.</span><span class="n">render</span><span class="p">(</span><span class="n">Context</span><span class="p">(</span><span class="n">dictionary</span><span class="p">))</span>
<span class="c"># Add the dictionary to the context stack, ensuring it gets removed again</span>
<span class="c"># to keep the context_instance in the same state it started in.</span>
<span class="n">context_instance</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">dictionary</span><span class="p">)</span>
<span class="k">try</span><span class="p">:</span>
<span class="k">return</span> <span class="n">t</span><span class="o">.</span><span class="n">render</span><span class="p">(</span><span class="n">context_instance</span><span class="p">)</span>
<span class="k">finally</span><span class="p">:</span>
<span class="n">context_instance</span><span class="o">.</span><span class="n">pop</span><span class="p">()</span>
<div class="viewcode-block" id="select_template"><a class="viewcode-back" href="../../../ref/templates/api.html#django.template.loader.select_template">[docs]</a><span class="k">def</span> <span class="nf">select_template</span><span class="p">(</span><span class="n">template_name_list</span><span class="p">):</span>
<span class="s">"Given a list of template names, returns the first that can be loaded."</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">template_name_list</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">TemplateDoesNotExist</span><span class="p">(</span><span class="s">"No template names provided"</span><span class="p">)</span>
<span class="n">not_found</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">for</span> <span class="n">template_name</span> <span class="ow">in</span> <span class="n">template_name_list</span><span class="p">:</span>
<span class="k">try</span><span class="p">:</span>
<span class="k">return</span> <span class="n">get_template</span><span class="p">(</span><span class="n">template_name</span><span class="p">)</span>
<span class="k">except</span> <span class="n">TemplateDoesNotExist</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
<span class="k">if</span> <span class="n">e</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">not_found</span><span class="p">:</span>
<span class="n">not_found</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">e</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="mi">0</span><span class="p">])</span>
<span class="k">continue</span>
<span class="c"># If we get here, none of the templates could be loaded</span>
<span class="k">raise</span> <span class="n">TemplateDoesNotExist</span><span class="p">(</span><span class="s">', '</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">not_found</span><span class="p">))</span>
</div>
<span class="n">add_to_builtins</span><span class="p">(</span><span class="s">'django.template.loader_tags'</span><span class="p">)</span>
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