Opened 10 years ago

Last modified 8 months ago

#23356 new Cleanup/optimization

Unable to create template tag which behaves similar to {% verbatim %} — at Version 2

Reported by: Jacob Rief Owned by: nobody
Component: Template system Version: dev
Severity: Normal Keywords: verbatim
Cc: Triage Stage: Accepted
Has patch: yes Needs documentation: no
Needs tests: no Patch needs improvement: yes
Easy pickings: no UI/UX: no

Description (last modified by shayneoneill)

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>

Change History (1)

comment:2 by shayneoneill, 10 years ago

Description: modified (diff)
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