<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>django.template — Django 1.6.7 documentation</title> <link rel="stylesheet" href="../../_static/default.css" type="text/css" /> <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '../../', VERSION: '1.6.7', COLLAPSE_INDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: true }; </script> <script type="text/javascript" src="../../_static/jquery.js"></script> <script type="text/javascript" src="../../_static/underscore.js"></script> <script type="text/javascript" src="../../_static/doctools.js"></script> <link rel="top" title="Django 1.6.7 documentation" href="../../index.html" /> <link rel="up" title="Module code" href="../index.html" /> <script type="text/javascript" src="../../templatebuiltins.js"></script> <script type="text/javascript"> (function($) { if (!django_template_builtins) { // templatebuiltins.js missing, do nothing. return; } $(document).ready(function() { // Hyperlink Django template tags and filters var base = "../../ref/templates/builtins.html"; if (base == "#") { // Special case for builtins.html itself base = ""; } // Tags are keywords, class '.k' $("div.highlight\\-html\\+django span.k").each(function(i, elem) { var tagname = $(elem).text(); if ($.inArray(tagname, django_template_builtins.ttags) != -1) { var fragment = tagname.replace(/_/, '-'); $(elem).html("<a href='" + base + "#" + fragment + "'>" + tagname + "</a>"); } }); // Filters are functions, class '.nf' $("div.highlight\\-html\\+django span.nf").each(function(i, elem) { var filtername = $(elem).text(); if ($.inArray(filtername, django_template_builtins.tfilters) != -1) { var fragment = filtername.replace(/_/, '-'); $(elem).html("<a href='" + base + "#" + fragment + "'>" + filtername + "</a>"); } }); }); })(jQuery); </script> </head> <body> <div class="document"> <div id="custom-doc" class="yui-t6"> <div id="hd"> <h1><a href="../../index.html">Django 1.6.7 documentation</a></h1> <div id="global-nav"> <a title="Home page" href="../../index.html">Home</a> | <a title="Table of contents" href="../../contents.html">Table of contents</a> | <a title="Global index" href="../../genindex.html">Index</a> | <a title="Module index" href="../../py-modindex.html">Modules</a> </div> <div class="nav"> <a href="../index.html" title="Module code" accesskey="U">up</a></div> </div> <div id="bd"> <div id="yui-main"> <div class="yui-b"> <div class="yui-g" id="_modules-django-template"> <h1>Source code for django.template</h1><div class="highlight"><pre> <span class="sd">"""</span> <span class="sd">This is the Django template system.</span> <span class="sd">How it works:</span> <span class="sd">The Lexer.tokenize() function converts a template string (i.e., a string containing</span> <span class="sd">markup with custom template tags) to tokens, which can be either plain text</span> <span class="sd">(TOKEN_TEXT), variables (TOKEN_VAR) or block statements (TOKEN_BLOCK).</span> <span class="sd">The Parser() class takes a list of tokens in its constructor, and its parse()</span> <span class="sd">method returns a compiled template -- which is, under the hood, a list of</span> <span class="sd">Node objects.</span> <span class="sd">Each Node is responsible for creating some sort of output -- e.g. simple text</span> <span class="sd">(TextNode), variable values in a given context (VariableNode), results of basic</span> <span class="sd">logic (IfNode), results of looping (ForNode), or anything else. The core Node</span> <span class="sd">types are TextNode, VariableNode, IfNode and ForNode, but plugin modules can</span> <span class="sd">define their own custom node types.</span> <span class="sd">Each Node has a render() method, which takes a Context and returns a string of</span> <span class="sd">the rendered node. For example, the render() method of a Variable Node returns</span> <span class="sd">the variable's value as a string. The render() method of an IfNode returns the</span> <span class="sd">rendered output of whatever was inside the loop, recursively.</span> <span class="sd">The Template class is a convenient wrapper that takes care of template</span> <span class="sd">compilation and rendering.</span> <span class="sd">Usage:</span> <span class="sd">The only thing you should ever use directly in this file is the Template class.</span> <span class="sd">Create a compiled template object with a template_string, then call render()</span> <span class="sd">with a context. In the compilation stage, the TemplateSyntaxError exception</span> <span class="sd">will be raised if the template doesn't have proper syntax.</span> <span class="sd">Sample code:</span> <span class="sd">>>> from django import template</span> <span class="sd">>>> s = u'<html>{% if test %}<h1>{{ varvalue }}</h1>{% endif %}</html>'</span> <span class="sd">>>> t = template.Template(s)</span> <span class="sd">(t is now a compiled template, and its render() method can be called multiple</span> <span class="sd">times with multiple contexts)</span> <span class="sd">>>> c = template.Context({'test':True, 'varvalue': 'Hello'})</span> <span class="sd">>>> t.render(c)</span> <span class="sd">u'<html><h1>Hello</h1></html>'</span> <span class="sd">>>> c = template.Context({'test':False, 'varvalue': 'Hello'})</span> <span class="sd">>>> t.render(c)</span> <span class="sd">u'<html></html>'</span> <span class="sd">"""</span> <span class="c"># Template lexing symbols</span> <span class="kn">from</span> <span class="nn">django.template.base</span> <span class="kn">import</span> <span class="p">(</span><span class="n">ALLOWED_VARIABLE_CHARS</span><span class="p">,</span> <span class="n">BLOCK_TAG_END</span><span class="p">,</span> <span class="n">BLOCK_TAG_START</span><span class="p">,</span> <span class="n">COMMENT_TAG_END</span><span class="p">,</span> <span class="n">COMMENT_TAG_START</span><span class="p">,</span> <span class="n">FILTER_ARGUMENT_SEPARATOR</span><span class="p">,</span> <span class="n">FILTER_SEPARATOR</span><span class="p">,</span> <span class="n">SINGLE_BRACE_END</span><span class="p">,</span> <span class="n">SINGLE_BRACE_START</span><span class="p">,</span> <span class="n">TOKEN_BLOCK</span><span class="p">,</span> <span class="n">TOKEN_COMMENT</span><span class="p">,</span> <span class="n">TOKEN_TEXT</span><span class="p">,</span> <span class="n">TOKEN_VAR</span><span class="p">,</span> <span class="n">TRANSLATOR_COMMENT_MARK</span><span class="p">,</span> <span class="n">UNKNOWN_SOURCE</span><span class="p">,</span> <span class="n">VARIABLE_ATTRIBUTE_SEPARATOR</span><span class="p">,</span> <span class="n">VARIABLE_TAG_END</span><span class="p">,</span> <span class="n">VARIABLE_TAG_START</span><span class="p">,</span> <span class="n">filter_re</span><span class="p">,</span> <span class="n">tag_re</span><span class="p">)</span> <span class="c"># Exceptions</span> <span class="kn">from</span> <span class="nn">django.template.base</span> <span class="kn">import</span> <span class="p">(</span><span class="n">ContextPopException</span><span class="p">,</span> <span class="n">InvalidTemplateLibrary</span><span class="p">,</span> <span class="n">TemplateDoesNotExist</span><span class="p">,</span> <span class="n">TemplateEncodingError</span><span class="p">,</span> <span class="n">TemplateSyntaxError</span><span class="p">,</span> <span class="n">VariableDoesNotExist</span><span class="p">)</span> <span class="c"># Template parts</span> <span class="kn">from</span> <span class="nn">django.template.base</span> <span class="kn">import</span> <span class="p">(</span><span class="n">Context</span><span class="p">,</span> <span class="n">FilterExpression</span><span class="p">,</span> <span class="n">Lexer</span><span class="p">,</span> <span class="n">Node</span><span class="p">,</span> <span class="n">NodeList</span><span class="p">,</span> <span class="n">Parser</span><span class="p">,</span> <span class="n">RequestContext</span><span class="p">,</span> <span class="n">Origin</span><span class="p">,</span> <span class="n">StringOrigin</span><span class="p">,</span> <span class="n">Template</span><span class="p">,</span> <span class="n">TextNode</span><span class="p">,</span> <span class="n">Token</span><span class="p">,</span> <span class="n">TokenParser</span><span class="p">,</span> <span class="n">Variable</span><span class="p">,</span> <span class="n">VariableNode</span><span class="p">,</span> <span class="n">constant_string</span><span class="p">,</span> <span class="n">filter_raw_string</span><span class="p">)</span> <span class="c"># Compiling templates</span> <span class="kn">from</span> <span class="nn">django.template.base</span> <span class="kn">import</span> <span class="p">(</span><span class="n">compile_string</span><span class="p">,</span> <span class="n">resolve_variable</span><span class="p">,</span> <span class="n">unescape_string_literal</span><span class="p">,</span> <span class="n">generic_tag_compiler</span><span class="p">)</span> <span class="c"># Library management</span> <span class="kn">from</span> <span class="nn">django.template.base</span> <span class="kn">import</span> <span class="p">(</span><span class="n">Library</span><span class="p">,</span> <span class="n">add_to_builtins</span><span class="p">,</span> <span class="n">builtins</span><span class="p">,</span> <span class="n">get_library</span><span class="p">,</span> <span class="n">get_templatetags_modules</span><span class="p">,</span> <span class="n">get_text_list</span><span class="p">,</span> <span class="n">import_library</span><span class="p">,</span> <span class="n">libraries</span><span class="p">)</span> <span class="n">__all__</span> <span class="o">=</span> <span class="p">(</span><span class="s">'Template'</span><span class="p">,</span> <span class="s">'Context'</span><span class="p">,</span> <span class="s">'RequestContext'</span><span class="p">,</span> <span class="s">'compile_string'</span><span class="p">)</span> </pre></div> </div> </div> </div> <div class="yui-b" id="sidebar"> <div class="sphinxsidebar"> <div class="sphinxsidebarwrapper"> <h3>Browse</h3> <ul> </ul> <h3>You are here:</h3> <ul> <li> <a href="../../index.html">Django 1.6.7 documentation</a> <ul><li><a href="../index.html">Module code</a> <ul><li>django.template</li></ul> </li></ul> </li> </ul> <div id="searchbox" style="display: none"> <h3>Quick search</h3> <form 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