""" This is the Django template system. How it works: The Lexer.tokenize() function converts a template string (i.e., a string containing markup with custom template tags) to tokens, which can be either plain text (TOKEN_TEXT), variables (TOKEN_VAR) or block statements (TOKEN_BLOCK). The Parser() class takes a list of tokens in its constructor, and its parse() method returns a compiled template -- which is, under the hood, a list of Node objects. Each Node is responsible for creating some sort of output -- e.g. simple text (TextNode), variable values in a given context (VariableNode), results of basic logic (IfNode), results of looping (ForNode), or anything else. The core Node types are TextNode, VariableNode, IfNode and ForNode, but plugin modules can define their own custom node types. Each Node has a render() method, which takes a Context and returns a string of the rendered node. For example, the render() method of a Variable Node returns the variable's value as a string. The render() method of an IfNode returns the rendered output of whatever was inside the loop, recursively. The Template class is a convenient wrapper that takes care of template compilation and rendering. Usage: The only thing you should ever use directly in this file is the Template class. Create a compiled template object with a template_string, then call render() with a context. In the compilation stage, the TemplateSyntaxError exception will be raised if the template doesn't have proper syntax. Sample code: >>> from django import template >>> s = u'{% if test %}

{{ varvalue }}

{% endif %}' >>> t = template.Template(s) (t is now a compiled template, and its render() method can be called multiple times with multiple contexts) >>> c = template.Context({'test':True, 'varvalue': 'Hello'}) >>> t.render(c) u'

Hello

' >>> c = template.Context({'test':False, 'varvalue': 'Hello'}) >>> t.render(c) u'' """ # Template lexing symbols from django.template.base import (ALLOWED_VARIABLE_CHARS, BLOCK_TAG_END, # NOQA BLOCK_TAG_START, COMMENT_TAG_END, COMMENT_TAG_START, FILTER_ARGUMENT_SEPARATOR, FILTER_SEPARATOR, SINGLE_BRACE_END, SINGLE_BRACE_START, TOKEN_BLOCK, TOKEN_COMMENT, TOKEN_TEXT, TOKEN_VAR, TRANSLATOR_COMMENT_MARK, UNKNOWN_SOURCE, VARIABLE_ATTRIBUTE_SEPARATOR, VARIABLE_TAG_END, VARIABLE_TAG_START, filter_re, tag_re) # Exceptions from django.template.base import (ContextPopException, InvalidTemplateLibrary, # NOQA TemplateDoesNotExist, TemplateEncodingError, TemplateSyntaxError, VariableDoesNotExist) # Template parts from django.template.base import (Context, FilterExpression, Lexer, Node, # NOQA NodeList, Parser, RequestContext, Origin, StringOrigin, Template, TextNode, Token, TokenParser, Variable, VariableNode, constant_string, filter_raw_string) # Compiling templates from django.template.base import (compile_string, resolve_variable, # NOQA unescape_string_literal, generic_tag_compiler) # Library management from django.template.base import (Library, add_to_builtins, builtins, # NOQA get_library, get_templatetags_modules, get_text_list, import_library, libraries) __all__ = ('Template', 'Context', 'RequestContext', 'compile_string')