[jira] [Created] (NIFI-3149) Expression Language should support passing negative numbers as literals

["Joseph Percivall (JIRA)" <ji...@apache.org>]

Joseph Percivall created NIFI-3149:
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             Summary: Expression Language should support passing negative numbers as literals
                 Key: NIFI-3149
                 URL: https://issues.apache.org/jira/browse/NIFI-3149
             Project: Apache NiFi
          Issue Type: Improvement
            Reporter: Joseph Percivall
            Assignee: Joseph Percivall
            Priority: Trivial


Currently using "${literal(-5.5):toNumber()" will result in an anltr parsing exception due to '-' not being handled in the Lexer[1]. 

In the ANTLR lexer, "+" and "-" should be added a potential values at the beginning of a WHOLE_NUMBER  or DECIMAL.

A workaround is to place the number in quotes: ${literal("-5.5"):toNumber()


[1] https://github.com/apache/nifi/blob/master/nifi-commons/nifi-expression-language/src/main/antlr3/org/apache/nifi/attribute/expression/language/antlr/AttributeExpressionLexer.g#L80-L80



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