Henri Biestro created JEXL-265:
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Summary: Ternary expression and namespace identifier grammar
ambiguity leads to parsing error
Key: JEXL-265
URL: https://issues.apache.org/jira/browse/JEXL-265
Project: Commons JEXL
Issue Type: Bug
Affects Versions: 3.1
Reporter: Henri Biestro
Assignee: Henri Biestro
Fix For: 3.2
A common expression like {{(true) ? x : abs(1)}} throws a parsing exception.
The workaround is to add parentheses around the right hand side {{(true) ? x :
(abs(1))}} .
The actual cause though is that the grammar can not disambiguate between a
correct ternary expression that uses a function call as right choice and one
that uses a namespace function call as left choice {{x : abs(1)}} and misses
the right hand choice, that latter case raising an exception.
To remove the ambiguity and actually stick closer to identifier form, a
namespace identifier like x:y will no longer allow spaces between the inner ':'
and the namespace (x) and identifier (y). This way, the intention of using a
namespace is made clear
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