Let me start by saying that I am fully aware that I can capture template
content with macro feature. However, macro requires writing macro and
invoking a macro, while with capture I can simply write content and declare
a variable the content should be stored in. So, the goal is to send the
content to the variable that is going to be used in a macro invocation.
I started with code listed on StackOverflow, but I it did not work. Below
you will find the solution that I created. I don't know Jinja2 internals,
so I have no idea if this solution may have any side effects or if there is
an easier way to accomplish my goal.
Could you review it and give me a feedback?
Thanks
P.S. I am coming from PHP Smarty that has a capture tag, which simplified
my life a few times.
from jinja2 import nodesimport jinja2from jinja2.ext import Extension
class CaptureExtension(Extension):
"""
Generic HTML capture, inspired by Rails' capture helper
In any template, you can capture an area of content and store it in a global
variable:
{% capture 'name_of_variable' %}
blah blah blah
{% endcapture %}
{% capture 'a' %}panorama{% endcapture %}
To display the result
{{ captured['name_of_variable'] }}
{{ captured['a'] }}
The context is global, and works within macros as well, so it's useful for
letting macros define
javascript or <head> tag content that needs to go at a particular position
on the base template.
Inspired by
http://stackoverflow.com/questions/4292630/insert-javascript-at-top-of-including-file-in-jinja-2
and http://api.rubyonrails.org/classes/ActionView/Helpers/CaptureHelper.html
"""
tags = set(['capture'])
def __init__(self, environment):
super(CaptureExtension, self).__init__(environment)
assert isinstance(environment, jinja2.Environment)
self._myScope = {}
environment.globals['captured'] = self._myScope
def parse(self, parser):
"""Parse tokens """
assert isinstance(parser, jinja2.parser.Parser)
tag = parser.stream.next()
args = [parser.parse_expression()]
body = parser.parse_statements(['name:endcapture'], drop_needle=True)
return nodes.CallBlock(self.call_method('_capture', args),[], [],
body).set_lineno(tag.lineno)
def _capture(self, name, caller):
self._myScope[name] = caller()
return ""
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