[jboss-jira] [JBoss JIRA] (DROOLS-1481) Validate function signature at compile time and improve error message

[Edson Tirelli (JIRA)]

Edson Tirelli created DROOLS-1481:
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             Summary: Validate function signature at compile time and improve error message
                 Key: DROOLS-1481
                 URL: https://issues.jboss.org/browse/DROOLS-1481
             Project: Drools
          Issue Type: Feature Request
          Components: dmn engine
    Affects Versions: 7.0.0.Beta7
            Reporter: Edson Tirelli
            Assignee: Edson Tirelli
             Fix For: 7.0.0.Final


   Function signatures as of now are only validated in runtime. We can improve it to add static validation as well. For instance, in the expression:

"$"+ (if Payment < 1000 then string(Payment) else (substring(string(Payment),1,1) + "," + 
substring(string(decimal(Payment,2),2))))

   In runtime I get:

Unable to find function 'string( class java.math.BigDecimal, class java.math.BigDecimal )'

    Because of:

...string(decimal(Payment,2),2)...

    Instead of (see the misplaced parenthesis):

...string(decimal(Payment,2)),2...

    I think we can also improve the error message to say:

Unable to find function 'string( number, number )'



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