Ok, I just took wolever's snippet at http://djangosnippets.org/snippets/1926/ and added template variable/filter support for range values.
For instance, you could write something like this:
{% mkrange 1 tool_page.paginator.num_pages|add:"1" as page_range %}
I'm just learning python and django, so any advice would be appreciated.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 | # based on: http://www.djangosnippets.org/snippets/1926/
from django.template import Library, Node, TemplateSyntaxError
register = Library()
class RangeNode(Node):
def __init__(self, parser, range_args, context_name):
self.template_parser = parser
self.range_args = range_args
self.context_name = context_name
def render(self, context):
resolved_ranges = []
for arg in self.range_args:
compiled_arg = self.template_parser.compile_filter(arg)
resolved_ranges.append(compiled_arg.resolve(context, ignore_failures=True))
context[self.context_name] = range(*resolved_ranges)
return ""
@register.tag
def mkrange(parser, token):
"""
Accepts the same arguments as the 'range' builtin and creates
a list containing the result of 'range'.
Syntax:
{% mkrange [start,] stop[, step] as context_name %}
For example:
{% mkrange 5 10 2 as some_range %}
{% for i in some_range %}
{{ i }}: Something I want to repeat\n
{% endfor %}
Produces:
5: Something I want to repeat
7: Something I want to repeat
9: Something I want to repeat
"""
tokens = token.split_contents()
fnctl = tokens.pop(0)
def error():
raise TemplateSyntaxError, "%s accepts the syntax: {%% %s [start,] " +\
"stop[, step] as context_name %%}, where 'start', 'stop' " +\
"and 'step' must all be integers." %(fnctl, fnctl)
range_args = []
while True:
if len(tokens) < 2:
error()
token = tokens.pop(0)
if token == "as":
break
range_args.append(token)
if len(tokens) != 1:
error()
context_name = tokens.pop()
return RangeNode(parser, range_args, context_name)
|
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Comments
Note that the created range can only be used once in Python 3. It will needl to be wrapped in a list() to be reused.
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