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https://issues.apache.org/jira/browse/JEXL-265?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16569254#comment-16569254
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Henri Biestro commented on JEXL-265:
------------------------------------
HOW (0):
It's not possible to check at parsing time wether a namespace is actually valid
or not; solution must be syntax/grammar only.
HOW (1):
To remove the ambiguity and actually stick 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 clear and the previous ambiguity removed.
With this solution, {{x?y:z()}} will generate an error...
> 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
> Priority: Minor
> 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 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.
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