[jira] [Commented] (JEXL-295) Add unary plus operator

["Henri Biestro (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/JEXL-295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16806522#comment-16806522 ] 

Henri Biestro commented on JEXL-295:
------------------------------------

We are naming the operation performed by the arithmetic when evaluating an operator; for unary-minus, the operation is negate, for unary-plus, the operation is positivize. The method name is the operation name, not its behaviour; the name will not change if we overload it to behave as Math.ab(...).

> Add unary plus operator
> -----------------------
>
>                 Key: JEXL-295
>                 URL: https://issues.apache.org/jira/browse/JEXL-295
>             Project: Commons JEXL
>          Issue Type: New Feature
>    Affects Versions: 3.1
>            Reporter: Henri Biestro
>            Assignee: Henri Biestro
>            Priority: Major
>             Fix For: 3.2
>
>
> WHAT
> Introduce a new operator, the unary plus as in '+4' or '+b' expressions. JEXL arithmetic already allows using a unary minus operator (the negate operation) so there is logic in having the counterpart.
> The proposed default behaviour would be to:
> - call the 'Math.abs(...)' method for numbers
> - return true for boolean 
> - could uppercase strings ? (should '-' lowercase strings ??)
> HOW
> - Follow the unary minus syntax and construct in the .jjt / ASTUnaryPlus / ParserVisitor
> - Implement Interpreter, Debugger
> - Implement abs in JexlArithmetic



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