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Basic usage looks like::
t = template.Template("<html>{{ myvalue }}</html>")
print t.generate(myvalue="XXX")
`Loader` is a class that loads templates from a root directory and caches
the compiled templates::
loader = template.Loader("/home/btaylor")
print loader.load("test.html").generate(myvalue="XXX")
We compile all templates to raw Python. Error-reporting is currently... uh,
interesting. Syntax for the templates::
### base.html
<html>
<head>
<title>{% block title %}Default title{% end %}</title>
</head>
<body>
<ul>
{% for student in students %}
{% block student %}
<li>{{ escape(student.name) }}</li>
{% end %}
{% end %}
</ul>
</body>
</html>
### bold.html
{% extends "base.html" %}
{% block title %}A bolder title{% end %}
{% block student %}
<li><span style="bold">{{ escape(student.name) }}</span></li>
{% end %}
Unlike most other template systems, we do not put any restrictions on the
expressions you can include in your statements. ``if`` and ``for`` blocks get
translated exactly into Python, so you can do complex expressions like::
{% for student in [p for p in people if p.student and p.age > 23] %}
<li>{{ escape(student.name) }}</li>
{% end %}
Translating directly to Python means you can apply functions to expressions
easily, like the ``escape()`` function in the examples above. You can pass
functions in to your template just like any other variable
(In a `.RequestHandler`, override `.RequestHandler.get_template_namespace`)::
### Python code
def add(x, y):
return x + y
template.execute(add=add)
### The template
{{ add(1, 2) }}
We provide the functions `escape() <.xhtml_escape>`, `.url_escape()`,
`.json_encode()`, and `.squeeze()` to all templates by default.
Typical applications do not create `Template` or `Loader` instances by
hand, but instead use the `~.RequestHandler.render` and
`~.RequestHandler.render_string` methods of
`tornado.web.RequestHandler`, which load templates automatically based
on the ``template_path`` `.Application` setting.
Variable names beginning with ``_tt_`` are reserved by the template
system and should not be used by application code.
Syntax Reference
----------------
Template expressions are surrounded by double curly braces: ``{{ ... }}``.
The contents may be any python expression, which will be escaped according
to the current autoescape setting and inserted into the output. Other
template directives use ``{% %}``. These tags may be escaped as ``{{!``
and ``{%!`` if you need to include a literal ``{{`` or ``{%`` in the output.
To comment out a section so that it is omitted from the output, surround it
with ``{# ... #}``.
``{% apply *function* %}...{% end %}``
Applies a function to the output of all template code between ``apply``
and ``end``::
{% apply linkify %}{{name}} said: {{message}}{% end %}
Note that as an implementation detail apply blocks are implemented
as nested functions and thus may interact strangely with variables
set via ``{% set %}``, or the use of ``{% break %}`` or ``{% continue %}``
within loops.
``{% autoescape *function* %}``
Sets the autoescape mode for the current file. This does not affect
other files, even those referenced by ``{% include %}``. Note that
autoescaping can also be configured globally, at the `.Application`
or `Loader`.::
{% autoescape xhtml_escape %}
{% autoescape None %}
``{% block *name* %}...{% end %}``
Indicates a named, replaceable block for use with ``{% extends %}``.
Blocks in the parent template will be replaced with the contents of
the same-named block in a child template.::
<!-- base.html -->
<title>{% block title %}Default title{% end %}</title>
<!-- mypage.html -->
{% extends "base.html" %}
{% block title %}My page title{% end %}
``{% comment ... %}``
A comment which will be removed from the template output. Note that
there is no ``{% end %}`` tag; the comment goes from the word ``comment``
to the closing ``%}`` tag.
``{% extends *filename* %}``
Inherit from another template. Templates that use ``extends`` should
contain one or more ``block`` tags to replace content from the parent
template. Anything in the child template not contained in a ``block``
tag will be ignored. For an example, see the ``{% block %}`` tag.
``{% for *var* in *expr* %}...{% end %}``
Same as the python ``for`` statement. ``{% break %}`` and
``{% continue %}`` may be used inside the loop.
``{% from *x* import *y* %}``
Same as the python ``import`` statement.
``{% if *condition* %}...{% elif *condition* %}...{% else %}...{% end %}``
Conditional statement - outputs the first section whose condition is
true. (The ``elif`` and ``else`` sections are optional)
``{% import *module* %}``
Same as the python ``import`` statement.
``{% include *filename* %}``
Includes another template file. The included file can see all the local
variables as if it were copied directly to the point of the ``include``
directive (the ``{% autoescape %}`` directive is an exception).
Alternately, ``{% module Template(filename, **kwargs) %}`` may be used
to include another template with an isolated namespace.
``{% module *expr* %}``
Renders a `~tornado.web.UIModule`. The output of the ``UIModule`` is
not escaped::
{% module Template("foo.html", arg=42) %}
``UIModules`` are a feature of the `tornado.web.RequestHandler`
class (and specifically its ``render`` method) and will not work
when the template system is used on its own in other contexts.
``{% raw *expr* %}``
Outputs the result of the given expression without autoescaping.
``{% set *x* = *y* %}``
Sets a local variable.
``{% try %}...{% except %}...{% else %}...{% finally %}...{% end %}``
Same as the python ``try`` statement.
``{% while *condition* %}... {% end %}``
Same as the python ``while`` statement. ``{% break %}`` and
``{% continue %}`` may be used inside the loop.
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