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<?xml version="1.0" encoding="ascii"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <title>babel.messages.extract</title> <link rel="stylesheet" href="epydoc.css" type="text/css" /> <script type="text/javascript" src="epydoc.js"></script> </head> <body bgcolor="white" text="black" link="blue" vlink="#204080" alink="#204080"> <!-- ==================== NAVIGATION BAR ==================== --> <table class="navbar" border="0" width="100%" cellpadding="0" bgcolor="#a0c0ff" cellspacing="0"> <tr valign="middle"> <!-- Home link --> <th> <a href="babel-module.html">Home</a> </th> <!-- Tree link --> <th> <a href="module-tree.html">Trees</a> </th> <!-- Index link --> <th> <a href="identifier-index.html">Indices</a> </th> <!-- Help link --> <th> <a href="help.html">Help</a> </th> <!-- Project homepage --> <th class="navbar" align="right" width="100%"> <table border="0" cellpadding="0" cellspacing="0"> <tr><th class="navbar" align="center" ><a class="navbar" target="_top" href="../index.html">Documentation Index</a></th> </tr></table></th> </tr> </table> <table width="100%" cellpadding="0" cellspacing="0"> <tr valign="top"> <td width="100%"> <span class="breadcrumbs"> <a href="babel-module.html">Package babel</a> :: <a href="babel.messages-module.html">Package messages</a> :: Module extract </span> </td> <td> <table cellpadding="0" cellspacing="0"> <!-- hide/show private --> </table> </td> </tr> </table> <!-- ==================== MODULE DESCRIPTION ==================== --> <h1 class="epydoc">Module extract</h1><p class="nomargin-top"></p> <p>Basic infrastructure for extracting localizable messages from source files.</p> <p>This module defines an extensible system for collecting localizable message strings from a variety of sources. A native extractor for Python source files is builtin, extractors for other sources can be added using very simple plugins.</p> <p>The main entry points into the extraction functionality are the functions <a href="babel.messages.extract-module.html#extract_from_dir" class="link">extract_from_dir</a> and <a href="babel.messages.extract-module.html#extract_from_file" class="link">extract_from_file</a>.</p> <!-- ==================== FUNCTIONS ==================== --> <a name="section-Functions"></a> <table class="summary" border="1" cellpadding="3" cellspacing="0" width="100%" bgcolor="white"> <tr bgcolor="#70b0f0" class="table-header"> <td align="left" colspan="2" class="table-header"> <span class="table-header">Functions</span></td> </tr> <tr> <td width="15%" align="right" valign="top" class="summary"> <span class="summary-type"><tt class="rst-docutils literal">iterator</tt></span> </td><td class="summary"> <table width="100%" cellpadding="0" cellspacing="0" border="0"> <tr> <td><span class="summary-sig"><a href="babel.messages.extract-module.html#extract_from_dir" class="summary-sig-name">extract_from_dir</a>(<span class="summary-sig-arg">dirname</span>=<span class="summary-sig-default"><code class="variable-quote">'</code><code class="variable-string">/home/fs/Open_Source/babel/svn/edgewall_svn/tags/0.9.6</code><code class="variable-quote">'</code></span>, <span class="summary-sig-arg">method_map</span>=<span class="summary-sig-default"><code class="variable-group">[</code><code class="variable-group">(</code><code class="variable-quote">'</code><code class="variable-string">**.py</code><code class="variable-quote">'</code><code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">python</code><code class="variable-quote">'</code><code class="variable-group">)</code><code class="variable-group">]</code></span>, <span class="summary-sig-arg">options_map</span>=<span class="summary-sig-default">None</span>, <span class="summary-sig-arg">keywords</span>=<span class="summary-sig-default"><code class="variable-group">{</code><code class="variable-quote">'</code><code class="variable-string">N_</code><code class="variable-quote">'</code><code class="variable-op">: </code>None<code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">_</code><code class="variable-quote">'</code><code class="variable-op">: </code>None<code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">dgettext</code><code class="variable-quote">'</code><code class="variable-op">: </code><code class="variable-group">(</code>2<code class="variable-group">)</code><code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">dngettext</code><code class="variable-quote">'</code><code class="variable-op">: </code><code class="variable-group">(</code>2<code class="variable-op">, </code>3<code class="variable-group">)</code><code class="variable-op">, </code><code class="variable-ellipsis">...</code></span>, <span class="summary-sig-arg">comment_tags</span>=<span class="summary-sig-default"><code class="variable-group">(</code><code class="variable-group">)</code></span>, <span class="summary-sig-arg">callback</span>=<span class="summary-sig-default">None</span>, <span class="summary-sig-arg">strip_comment_tags</span>=<span class="summary-sig-default">False</span>)</span><br /> Extract messages from any source files found in the given directory.</td> <td align="right" valign="top"> </td> </tr> </table> </td> </tr> <tr> <td width="15%" align="right" valign="top" class="summary"> <span class="summary-type"><code class="link">list</code></span> </td><td class="summary"> <table width="100%" cellpadding="0" cellspacing="0" border="0"> <tr> <td><span class="summary-sig"><a href="babel.messages.extract-module.html#extract_from_file" class="summary-sig-name">extract_from_file</a>(<span class="summary-sig-arg">method</span>, <span class="summary-sig-arg">filename</span>, <span class="summary-sig-arg">keywords</span>=<span class="summary-sig-default"><code class="variable-group">{</code><code class="variable-quote">'</code><code class="variable-string">N_</code><code class="variable-quote">'</code><code class="variable-op">: </code>None<code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">_</code><code class="variable-quote">'</code><code class="variable-op">: </code>None<code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">dgettext</code><code class="variable-quote">'</code><code class="variable-op">: </code><code class="variable-group">(</code>2<code class="variable-group">)</code><code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">dngettext</code><code class="variable-quote">'</code><code class="variable-op">: </code><code class="variable-group">(</code>2<code class="variable-op">, </code>3<code class="variable-group">)</code><code class="variable-op">, </code><code class="variable-ellipsis">...</code></span>, <span class="summary-sig-arg">comment_tags</span>=<span class="summary-sig-default"><code class="variable-group">(</code><code class="variable-group">)</code></span>, <span class="summary-sig-arg">options</span>=<span class="summary-sig-default">None</span>, <span class="summary-sig-arg">strip_comment_tags</span>=<span class="summary-sig-default">False</span>)</span><br /> Extract messages from a specific file.</td> <td align="right" valign="top"> </td> </tr> </table> </td> </tr> <tr> <td width="15%" align="right" valign="top" class="summary"> <span class="summary-type"><code class="link">list</code></span> </td><td class="summary"> <table width="100%" cellpadding="0" cellspacing="0" border="0"> <tr> <td><span class="summary-sig"><a href="babel.messages.extract-module.html#extract" class="summary-sig-name">extract</a>(<span class="summary-sig-arg">method</span>, <span class="summary-sig-arg">fileobj</span>, <span class="summary-sig-arg">keywords</span>=<span class="summary-sig-default"><code class="variable-group">{</code><code class="variable-quote">'</code><code class="variable-string">N_</code><code class="variable-quote">'</code><code class="variable-op">: </code>None<code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">_</code><code class="variable-quote">'</code><code class="variable-op">: </code>None<code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">dgettext</code><code class="variable-quote">'</code><code class="variable-op">: </code><code class="variable-group">(</code>2<code class="variable-group">)</code><code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">dngettext</code><code class="variable-quote">'</code><code class="variable-op">: </code><code class="variable-group">(</code>2<code class="variable-op">, </code>3<code class="variable-group">)</code><code class="variable-op">, </code><code class="variable-ellipsis">...</code></span>, <span class="summary-sig-arg">comment_tags</span>=<span class="summary-sig-default"><code class="variable-group">(</code><code class="variable-group">)</code></span>, <span class="summary-sig-arg">options</span>=<span class="summary-sig-default">None</span>, <span class="summary-sig-arg">strip_comment_tags</span>=<span class="summary-sig-default">False</span>)</span><br /> Extract messages from the given file-like object using the specified extraction method.</td> <td align="right" valign="top"> </td> </tr> </table> </td> </tr> </table> <!-- ==================== FUNCTION DETAILS ==================== --> <a name="section-FunctionDetails"></a> <table class="details" border="1" cellpadding="3" cellspacing="0" width="100%" bgcolor="white"> <tr bgcolor="#70b0f0" class="table-header"> <td align="left" colspan="2" class="table-header"> <span class="table-header">Function Details</span></td> </tr> </table> <a name="extract_from_dir"></a> <div> <table class="details" border="1" cellpadding="3" cellspacing="0" width="100%" bgcolor="white"> <tr><td> <table width="100%" cellpadding="0" cellspacing="0" border="0"> <tr valign="top"><td> <h3 class="epydoc"><span class="sig"><span class="sig-name">extract_from_dir</span>(<span class="sig-arg">dirname</span>=<span class="sig-default"><code class="variable-quote">'</code><code class="variable-string">/home/fs/Open_Source/babel/svn/edgewall_svn/tags/0.9.6</code><code class="variable-quote">'</code></span>, <span class="sig-arg">method_map</span>=<span class="sig-default"><code class="variable-group">[</code><code class="variable-group">(</code><code class="variable-quote">'</code><code class="variable-string">**.py</code><code class="variable-quote">'</code><code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">python</code><code class="variable-quote">'</code><code class="variable-group">)</code><code class="variable-group">]</code></span>, <span class="sig-arg">options_map</span>=<span class="sig-default">None</span>, <span class="sig-arg">keywords</span>=<span class="sig-default"><code class="variable-group">{</code><code class="variable-quote">'</code><code class="variable-string">N_</code><code class="variable-quote">'</code><code class="variable-op">: </code>None<code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">_</code><code class="variable-quote">'</code><code class="variable-op">: </code>None<code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">dgettext</code><code class="variable-quote">'</code><code class="variable-op">: </code><code class="variable-group">(</code>2<code class="variable-group">)</code><code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">dngettext</code><code class="variable-quote">'</code><code class="variable-op">: </code><code class="variable-group">(</code>2<code class="variable-op">, </code>3<code class="variable-group">)</code><code class="variable-op">, </code><code class="variable-ellipsis">...</code></span>, <span class="sig-arg">comment_tags</span>=<span class="sig-default"><code class="variable-group">(</code><code class="variable-group">)</code></span>, <span class="sig-arg">callback</span>=<span class="sig-default">None</span>, <span class="sig-arg">strip_comment_tags</span>=<span class="sig-default">False</span>)</span> </h3> </td><td align="right" valign="top" > </td> </tr></table> <p>Extract messages from any source files found in the given directory.</p> <p>This function generates tuples of the form:</p> <blockquote> <tt class="rst-docutils literal">(filename, lineno, message, comments)</tt></blockquote> <p>Which extraction method is used per file is determined by the <code class="link">method_map</code> parameter, which maps extended glob patterns to extraction method names. For example, the following is the default mapping:</p> <pre class="py-doctest"> <span class="py-prompt">>>> </span>method_map = [ <span class="py-more">... </span> (<span class="py-string">'**.py'</span>, <span class="py-string">'python'</span>) <span class="py-more">... </span>]</pre> <p>This basically says that files with the filename extension ".py" at any level inside the directory should be processed by the "python" extraction method. Files that don't match any of the mapping patterns are ignored. See the documentation of the <a href="babel.util-module.html#pathmatch" class="link">pathmatch</a> function for details on the pattern syntax.</p> <p>The following extended mapping would also use the "genshi" extraction method on any file in "templates" subdirectory:</p> <pre class="py-doctest"> <span class="py-prompt">>>> </span>method_map = [ <span class="py-more">... </span> (<span class="py-string">'**/templates/**.*'</span>, <span class="py-string">'genshi'</span>), <span class="py-more">... </span> (<span class="py-string">'**.py'</span>, <span class="py-string">'python'</span>) <span class="py-more">... </span>]</pre> <p>The dictionary provided by the optional <code class="link">options_map</code> parameter augments these mappings. It uses extended glob patterns as keys, and the values are dictionaries mapping options names to option values (both strings).</p> <p>The glob patterns of the <code class="link">options_map</code> do not necessarily need to be the same as those used in the method mapping. For example, while all files in the <tt class="rst-docutils literal">templates</tt> folders in an application may be Genshi applications, the options for those files may differ based on extension:</p> <pre class="py-doctest"> <span class="py-prompt">>>> </span>options_map = { <span class="py-more">... </span> <span class="py-string">'**/templates/**.txt'</span>: { <span class="py-more">... </span> <span class="py-string">'template_class'</span>: <span class="py-string">'genshi.template:TextTemplate'</span>, <span class="py-more">... </span> <span class="py-string">'encoding'</span>: <span class="py-string">'latin-1'</span> <span class="py-more">... </span> }, <span class="py-more">... </span> <span class="py-string">'**/templates/**.html'</span>: { <span class="py-more">... </span> <span class="py-string">'include_attrs'</span>: <span class="py-string">''</span> <span class="py-more">... </span> } <span class="py-more">... </span>}</pre> <dl class="fields"> <dt>Parameters:</dt> <dd><ul class="nomargin-top"> <li><strong class="pname"><code>dirname</code></strong> - the path to the directory to extract messages from</li> <li><strong class="pname"><code>method_map</code></strong> - a list of <tt class="rst-docutils literal">(pattern, method)</tt> tuples that maps of extraction method names to extended glob patterns</li> <li><strong class="pname"><code>options_map</code></strong> - a dictionary of additional options (optional)</li> <li><strong class="pname"><code>keywords</code></strong> - a dictionary mapping keywords (i.e. names of functions that should be recognized as translation functions) to tuples that specify which of their arguments contain localizable strings</li> <li><strong class="pname"><code>comment_tags</code></strong> - a list of tags of translator comments to search for and include in the results</li> <li><strong class="pname"><code>callback</code></strong> - a function that is called for every file that message are extracted from, just before the extraction itself is performed; the function is passed the filename, the name of the extraction method and and the options dictionary as positional arguments, in that order</li> <li><strong class="pname"><code>strip_comment_tags</code></strong> - a flag that if set to <code class="link">True</code> causes all comment tags to be removed from the collected comments.</li> </ul></dd> <dt>Returns: <tt class="rst-rst-docutils literal rst-docutils literal">iterator</tt></dt> <dd>an iterator over <tt class="rst-docutils literal">(filename, lineno, funcname, message)</tt> tuples</dd> </dl> <div class="fields"> <p><strong>See Also:</strong> <a href="babel.util-module.html#pathmatch" class="link">pathmatch</a> </p> </div></td></tr></table> </div> <a name="extract_from_file"></a> <div> <table class="details" border="1" cellpadding="3" cellspacing="0" width="100%" bgcolor="white"> <tr><td> <table width="100%" cellpadding="0" cellspacing="0" border="0"> <tr valign="top"><td> <h3 class="epydoc"><span class="sig"><span class="sig-name">extract_from_file</span>(<span class="sig-arg">method</span>, <span class="sig-arg">filename</span>, <span class="sig-arg">keywords</span>=<span class="sig-default"><code class="variable-group">{</code><code class="variable-quote">'</code><code class="variable-string">N_</code><code class="variable-quote">'</code><code class="variable-op">: </code>None<code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">_</code><code class="variable-quote">'</code><code class="variable-op">: </code>None<code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">dgettext</code><code class="variable-quote">'</code><code class="variable-op">: </code><code class="variable-group">(</code>2<code class="variable-group">)</code><code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">dngettext</code><code class="variable-quote">'</code><code class="variable-op">: </code><code class="variable-group">(</code>2<code class="variable-op">, </code>3<code class="variable-group">)</code><code class="variable-op">, </code><code class="variable-ellipsis">...</code></span>, <span class="sig-arg">comment_tags</span>=<span class="sig-default"><code class="variable-group">(</code><code class="variable-group">)</code></span>, <span class="sig-arg">options</span>=<span class="sig-default">None</span>, <span class="sig-arg">strip_comment_tags</span>=<span class="sig-default">False</span>)</span> </h3> </td><td align="right" valign="top" > </td> </tr></table> <p>Extract messages from a specific file.</p> <p>This function returns a list of tuples of the form:</p> <blockquote> <tt class="rst-docutils literal">(lineno, funcname, message)</tt></blockquote> <dl class="fields"> <dt>Parameters:</dt> <dd><ul class="nomargin-top"> <li><strong class="pname"><code>filename</code></strong> - the path to the file to extract messages from</li> <li><strong class="pname"><code>method</code></strong> - a string specifying the extraction method (.e.g. "python")</li> <li><strong class="pname"><code>keywords</code></strong> - a dictionary mapping keywords (i.e. names of functions that should be recognized as translation functions) to tuples that specify which of their arguments contain localizable strings</li> <li><strong class="pname"><code>comment_tags</code></strong> - a list of translator tags to search for and include in the results</li> <li><strong class="pname"><code>strip_comment_tags</code></strong> - a flag that if set to <code class="link">True</code> causes all comment tags to be removed from the collected comments.</li> <li><strong class="pname"><code>options</code></strong> - a dictionary of additional options (optional)</li> </ul></dd> <dt>Returns: <code class="link">list</code></dt> <dd>the list of extracted messages</dd> </dl> </td></tr></table> </div> <a name="extract"></a> <div> <table class="details" border="1" cellpadding="3" cellspacing="0" width="100%" bgcolor="white"> <tr><td> <table width="100%" cellpadding="0" cellspacing="0" border="0"> <tr valign="top"><td> <h3 class="epydoc"><span class="sig"><span class="sig-name">extract</span>(<span class="sig-arg">method</span>, <span class="sig-arg">fileobj</span>, <span class="sig-arg">keywords</span>=<span class="sig-default"><code class="variable-group">{</code><code class="variable-quote">'</code><code class="variable-string">N_</code><code class="variable-quote">'</code><code class="variable-op">: </code>None<code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">_</code><code class="variable-quote">'</code><code class="variable-op">: </code>None<code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">dgettext</code><code class="variable-quote">'</code><code class="variable-op">: </code><code class="variable-group">(</code>2<code class="variable-group">)</code><code class="variable-op">, </code><code class="variable-quote">'</code><code class="variable-string">dngettext</code><code class="variable-quote">'</code><code class="variable-op">: </code><code class="variable-group">(</code>2<code class="variable-op">, </code>3<code class="variable-group">)</code><code class="variable-op">, </code><code class="variable-ellipsis">...</code></span>, <span class="sig-arg">comment_tags</span>=<span class="sig-default"><code class="variable-group">(</code><code class="variable-group">)</code></span>, <span class="sig-arg">options</span>=<span class="sig-default">None</span>, <span class="sig-arg">strip_comment_tags</span>=<span class="sig-default">False</span>)</span> </h3> </td><td align="right" valign="top" > </td> </tr></table> <p>Extract messages from the given file-like object using the specified extraction method.</p> <p>This function returns a list of tuples of the form:</p> <blockquote> <tt class="rst-docutils literal">(lineno, message, comments)</tt></blockquote> <p>The implementation dispatches the actual extraction to plugins, based on the value of the <tt class="rst-docutils literal">method</tt> parameter.</p> <pre class="py-doctest"> <span class="py-prompt">>>> </span>source = <span class="py-string">'''# foo module</span> <span class="py-more">... </span><span class="py-string">def run(argv):</span> <span class="py-more">... </span><span class="py-string"> print _('Hello, world!')</span> <span class="py-more">... </span><span class="py-string">'''</span></pre> <pre class="py-doctest"> <span class="py-prompt">>>> </span><span class="py-keyword">from</span> StringIO <span class="py-keyword">import</span> StringIO <span class="py-prompt">>>> </span><span class="py-keyword">for</span> message <span class="py-keyword">in</span> extract(<span class="py-string">'python'</span>, StringIO(source)): <span class="py-more">... </span> <span class="py-keyword">print</span> message <span class="py-output">(3, u'Hello, world!', [])</span></pre> <dl class="fields"> <dt>Parameters:</dt> <dd><ul class="nomargin-top"> <li><strong class="pname"><code>method</code></strong> - a string specifying the extraction method (.e.g. "python"); if this is a simple name, the extraction function will be looked up by entry point; if it is an explicit reference to a function (of the form <tt class="rst-docutils literal">package.module:funcname</tt> or <tt class="rst-docutils literal">package.module.funcname</tt>), the corresponding function will be imported and used</li> <li><strong class="pname"><code>fileobj</code></strong> - the file-like object the messages should be extracted from</li> <li><strong class="pname"><code>keywords</code></strong> - a dictionary mapping keywords (i.e. names of functions that should be recognized as translation functions) to tuples that specify which of their arguments contain localizable strings</li> <li><strong class="pname"><code>comment_tags</code></strong> - a list of translator tags to search for and include in the results</li> <li><strong class="pname"><code>options</code></strong> - a dictionary of additional options (optional)</li> <li><strong class="pname"><code>strip_comment_tags</code></strong> - a flag that if set to <code class="link">True</code> causes all comment tags to be removed from the collected comments.</li> </ul></dd> <dt>Returns: <code class="link">list</code></dt> <dd>the list of extracted messages</dd> <dt>Raises:</dt> <dd><ul class="nomargin-top"> <li><code><strong class='fraise'>ValueError</strong></code> - if the extraction method is not registered</li> </ul></dd> </dl> </td></tr></table> </div> <br /> <!-- ==================== NAVIGATION BAR ==================== --> <table class="navbar" border="0" width="100%" cellpadding="0" bgcolor="#a0c0ff" cellspacing="0"> <tr valign="middle"> <!-- Home link --> <th> <a href="babel-module.html">Home</a> </th> <!-- Tree link --> <th> <a href="module-tree.html">Trees</a> </th> <!-- Index link --> <th> <a href="identifier-index.html">Indices</a> </th> <!-- Help link --> <th> <a href="help.html">Help</a> </th> <!-- Project homepage --> <th class="navbar" align="right" width="100%"> <table border="0" cellpadding="0" cellspacing="0"> <tr><th class="navbar" align="center" ><a class="navbar" target="_top" href="../index.html">Documentation Index</a></th> </tr></table></th> </tr> </table> <table border="0" cellpadding="0" cellspacing="0" width="100%%"> <tr> <td align="left" class="footer"> Generated by Epydoc 3.0.1 on Thu Mar 17 15:12:44 2011 </td> <td align="right" class="footer"> <a target="mainFrame" href="http://epydoc.sourceforge.net" >http://epydoc.sourceforge.net</a> </td> </tr> </table> <script type="text/javascript"> <!-- // Private objects are initially displayed (because if // javascript is turned off then we want them to be // visible); but by default, we want to hide them. 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