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

[Edson Tirelli (JIRA)]

    [ https://issues.jboss.org/browse/DROOLS-1481?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13393890#comment-13393890 ] 

Edson Tirelli commented on DROOLS-1481:
---------------------------------------

[~tari_manga] , I am targeting 7.1.0 for this fix, so lets fix what we have for 7.0.0 first and then look into this.

> 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: Matteo Mortari
>             Fix For: 7.1.0.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:
> {code}"$"+ (if Payment < 1000 then string(Payment) else (substring(string(Payment),1,1) + "," + substring(string(decimal(Payment,2),2)))){code}
>    In runtime I get:
> {quote}Unable to find function 'string( class java.math.BigDecimal, class java.math.BigDecimal )'{quote}
>     Because of:
> {code}...string(decimal(Payment,2),2)...{code}
>     Instead of (see the misplaced parenthesis):
> {code}...string(decimal(Payment,2)),2...{code}
>     I think we can also improve the error message to say:
> {quote}Unable to find function 'string( number, number )'{quote}



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