[JEXL-295] Add unary plus operator

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.1
• Fix Version/s: 3.2
• Assignee: Henri Biestro
• Reporter: Henri Biestro
• Created: 27/Mar/19 17:10
• Updated: 07/Jun/21 13:14
• Resolved: 29/Mar/19 14:47

Description

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

Issue Links

• relates to: JEXL-293 leading plus sign not recognized