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Accessing a single string char at an index has no output #633
Description
Hello, thanks for this library! I ran into a small issue that can be worked around easily, but is still a point of incompatibility with python jinja2. (Although, it doesn't work in Django templates either (see at the end), so maybe it's out of scope.)
In jinja2, I can interpolate a single character of a string:
>>> import jinja2
>>> jinja2.__version__
'2.11.3'
>>> jinja2.Template("{{ x[0] }}").render({'x': 'stuff'})
's'whereas in jinjava (2.5.6 from maven), this is empty:
Clojure 1.10.3
user=> (import '[com.hubspot.jinjava Jinjava])
com.hubspot.jinjava.Jinjava
user=> (.render (Jinjava.) "{{ x[0] }}" {"x" "stuff"})
""(This is the clojure shell, but it's importing the same java library, and I first observed this behaviour in a pure-java service.)
I can get around this by using a slice instead of a single index:
user=> (.render (Jinjava.) "{{ x[0:1] }}" {"x" "stuff"})
"s"which works equivalently in python jinja2:
>>> jinja2.Template("{{ x[0:1] }}").render({'x': 'stuff'})
's'For sake of comparison, indexing a string doesn't seem to work at all in django templates, whether it's a single character or a slice:
>>> # Setup
>>> from django.conf import settings
>>> settings.configure(DEBUG=True, TEMPLATE_DEBUG=True, TEMPLATE_LOADERS=(), TEMPLATES=[{'BACKEND':'django.template.backends.django.DjangoTemplates', 'OPTIONS':{'loaders':[('django.template.loaders.locmem.Loader', {'main': ''})]}}])
>>> import django
>>> django.setup()
>>> from django.template import Context, Template
>>>
>>> Template('{{ x[0:5] }}').render(Context({'x': 'stuff'}))
Traceback (most recent call last):
...
django.template.exceptions.TemplateSyntaxError: Could not parse the remainder: '[0:5]' from 'x[0:5]'
>>> Template('{{ x[0] }}').render(Context({'x': ['stuff', 1, 2, 3, 4, 5, 6]}))
Traceback (most recent call last):
...
django.template.exceptions.TemplateSyntaxError: Could not parse the remainder: '[0]' from 'x[0]'although I can use the slice filter instead (which does python iterable slicing, not the chunking of jinja's slice):
>>> Template('{{ x|slice:1 }}').render(Context({'x': 'stuff'}))
's'
>>> Template('{{ x|slice:"0:2" }}').render(Context({'x': 'stuff'}))
'st'
Activity
use slice - HubSpot/jinjava#633