[jira] [Created] (JEXL-438) Allow alternative syntax

["Yair Lenga (Jira)" <ji...@apache.org>]

Yair Lenga created JEXL-438:
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             Summary: Allow alternative syntax
                 Key: JEXL-438
                 URL: https://issues.apache.org/jira/browse/JEXL-438
             Project: Commons JEXL
          Issue Type: New Feature
            Reporter: Yair Lenga


Im using jexl3 to allow customization by end users of workflow. The users love the flexibility, but are having repeated issues with the grammar. Specifically, the == operator. I understand the parser can not be configured at run time flag, as it is generated code by JavaScript, and changing = to mean equals will change parsing logic, operator precedence, etc.

My ask: possible to allow for an alternate parser (parser-sql.jjt), which will be modified/extended version of the existing parser.jjt, and will provide more sql/excel operators. in particular, no assignment inside expressions, making OR AND NOT synonym for || && and !. Accepting =, <> for comparisons, etc.

Implementation can allow for a Boolean mode, 'Sqlish', same as 'antish' property. I'm not sure if possible to build a parser outside the jexl3 tree. If yes, will be nice to be able to pass a class that implement the same interface as the current parser.

For my use case, I do not mind having all the jexl3 extension features, even the one not in the sql/excel grammar in. 

 



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