Syntax error when using `is defined` with a `filter`

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
45/100
Issue type
Bug
Clarity
Clearly specified
Activity status
Stale
Tech stack
java
Domain
backend

Research direction

No source file or test is named. Start by reproducing the Java parser failure with the provided template and binding, then trace parsing of a filter expression followed by is defined; done means the unparenthesized form parses and behaves like the parenthesized Python Jinja form.

Written by the indexing model from the issue text.

Description

Template:

  {% if value_json.name | first is defined %}a{% else %}b{% endif %}

With binding:

{
  "name": [ "c" ]
}

raises com.hubspot.jinjava.interpret.FatalTemplateErrorsException: Error parsing 'value_json.name | first is defined': syntax error at position 27, encountered 'is', expected '}'

This works in Python Jinja. I can work around with parentheses:

{% if (value_json.name | first) is defined %}a{% else %}b{% endif %}
Dominant language
Java
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Forks
184
Avg merge
6d 22h
Merged PRs (30d)
1

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