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https://issues.apache.org/jira/browse/NIFI-3149?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15722885#comment-15722885
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ASF GitHub Bot commented on NIFI-3149:
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Github user mattyb149 commented on the issue:
https://github.com/apache/nifi/pull/1298
Reviewing...
> 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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