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https://issues.apache.org/jira/browse/JEXL-316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16941000#comment-16941000
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Dmitri Blinov commented on JEXL-316:
------------------------------------
The {{??}} operator was introduced IIRC, in version 3.2. Not sure about elvis
operator. Intuitively nothing is wrong with it.
> Operator ?? has very low priority
> ---------------------------------
>
> Key: JEXL-316
> URL: https://issues.apache.org/jira/browse/JEXL-316
> Project: Commons JEXL
> Issue Type: Bug
> Affects Versions: 3.1
> Reporter: Dmitri Blinov
> Assignee: Henri Biestro
> Priority: Major
> Fix For: 3.2
>
>
> In current version of JEXL the script
> {code:java}
> 10??0 + 200 {code}
> evaluates to 10, which is counterintuitive. It requires to always use
> parantheses after {{\\??}}. The operator {{??}} should have higer priority.
> It is the same problem as with current version of freemarker, but they
> promise to fix it in the next major release.
> The suggestion is to set priority of operator {{??}} to be between
> {{UnaryExpression()}} and {{ValueExpression()}}
> {code}
> void ConditionalExpression() #void : {}
> {
> ConditionalOrExpression()
> (
> <QMARK> Expression() <COLON> Expression() #TernaryNode(3)
> |
> <ELVIS> Expression() #TernaryNode(2)
> )?
> }
> ...
> void UnaryExpression() #void : {}
> {
> <minus> UnaryExpression() #UnaryMinusNode(1)
> |
> <plus> UnaryExpression() #UnaryPlusNode(1)
> |
> <tilda> UnaryExpression() #BitwiseComplNode(1)
> |
> (<not>|<NOT>) UnaryExpression() #NotNode(1)
> |
> <EMPTY> UnaryExpression() #EmptyFunction(1)
> |
> <SIZE> UnaryExpression() #SizeFunction(1)
> |
> NullpExpression()
> }
> void NullpExpression() #void : {}
> {
> ValueExpression()
> (
> <NULLP> ValueExpression() #NullpNode(2)
> )*
> }
> {code}
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