#23356: Unable to create template tag which behaves similar to {% verbatim %}
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Reporter: jrief | Owner: nobody
Type: Uncategorized | Status: closed
Component: Template system | Version: master
Severity: Normal | Resolution: wontfix
Keywords: verbatim | Triage Stage: Unreviewed
Has patch: 1 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Description changed by shayneoneill:
Old description:
> Currently it is impossible to create custom template tags which behave
> similar to {{{ {% verbatim %} }}}.
> The reason is in {{{Lexer.create_token()}}}. There, the class member
> {{{self.verbatim}}} is set for template blocks in "verbatim" state. It is
> impossible to turn on that state from outside, ie. a template tag.
>
> Fixing this, would be as simple as changing {{{if block_content[:9] in
> ('verbatim', 'verbatim ')}}} to {{{if
> block_content.startswith('verbatim')}}} or to {{{if block_content[:9] in
> ('verbatim', 'verbatim ', 'verbatim_')}}}.
> Then all template tags beginning with verbatim..., would start in
> "verbatim" state. I don't assume this will break any existing code; who
> starts the name of a templatetag with 'verbatim...' if not for that
> purpose?
>
> Background information why this is useful:
> Templates syntax for Django and AngularJS is very similar, and with some
> caveats it is possible to reuse a Django template for rendering in
> AngularJS. I therefore attempted to add a context sensitive variation of
> the verbatim tag to this app https://github.com/jrief/django-angular, but
> was hindered by this issue.
>
> BTW: This part of the Django code did not change from 1.6 up to master.
New description:
Currently it is impossible to create custom template tags which behave
similar to {{{ {% verbatim %} }}}.
The reason is in {{{Lexer.create_token()}}}. There, the class member
{{{self.verbatim}}} is set for template blocks in "verbatim" state. It is
impossible to turn on that state from outside, ie. a template tag.
Fixing this, would be as simple as changing {{{if block_content[:9] in
('verbatim', 'verbatim ')}}} to {{{if
block_content.startswith('verbatim')}}} or to {{{if block_content[:9] in
('verbatim', 'verbatim ', 'verbatim_')}}}.
Then all template tags beginning with verbatim..., would start in
"verbatim" state. I don't assume this will break any existing code; who
starts the name of a templatetag with 'verbatim...' if not for that
purpose?
Background information why this is useful:
Templates syntax for Django and AngularJS is very similar, and with some
caveats it is possible to reuse a Django template for rendering in
AngularJS. I therefore attempted to add a context sensitive variation of
the verbatim tag to this app https://github.com/jrief/django-angular, but
was hindered by this issue.
BTW: This part of the Django code did not change from 1.6 up to master.
For the purposes of anyone coming across this ticket and pulling their
hair out over it, heres a template tag that might ease the pain;-
{{{
from django import template
register = template.Library()
@register.filter(name='specialbracket')
def specialbracket(value):
if value == 'left':
return "{{"
elif value == 'right':
return "}}"
else:
return "??"
}}}
And the above example solved with this tag;-
{{{
<td class="field-{{ident}}">{{ 'left'|specialbracket }}
computer.{{field}} {{ 'right'|specialbracket }} </td>
}}}
--
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Ticket URL: <https://code.djangoproject.com/ticket/23356#comment:2>
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