[jira] Issue Comment Edited: (VELOCITY-688) ! preceding a reference in strict mode ignores a null exception

["Christoph Reck (JIRA)" <de...@velocity.apache.org>]

    [ https://issues.apache.org/jira/browse/VELOCITY-688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12672333#action_12672333 ] 

chreck edited comment on VELOCITY-688 at 2/10/09 9:58 AM:
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The original intent of the bang syntax ($!foo) - it is to allow the template writer to say "this may be null".

Without strict mode, $!foo will not log anything if it is undefined or null.

I have not used the strict mode, so I have not considered what to do then for a $foo that is undefined or null. I do agree with Nathan that a $foo null reference in strict mode should throw an exception as originally devised. A $!foo null reference in strict mode could output nothing or throw an exception (no preference here).


      was (Author: chreck):
    This is the original intent of the bang syntax - it is to allow the template writer to say "this may be null".

Without strict mode, $!foo will not log anything if it is undefined or null.

I have not used the strict mode, so I have not considered what to do then for a $foo that is undefined or null. I do agree with Nathan that a $foo null reference in strict mode should throw an exception as originally devised. A $!foo null reference in strict mode should output nothing or throw an exception (no preference here).

  
> ! preceding a reference in strict mode ignores a null exception
> ---------------------------------------------------------------
>
>                 Key: VELOCITY-688
>                 URL: https://issues.apache.org/jira/browse/VELOCITY-688
>             Project: Velocity
>          Issue Type: Improvement
>          Components: Engine
>    Affects Versions: 1.7
>            Reporter: Byron Foster
>             Fix For: 1.7
>
>
> Change strict mode (runtime.references.strict = true) behavior such that when Velocity attempts to render a reference that evaluates to null then throw an exception.  If the reference is preceded by '$!' as in $!foo, then simply render nothing and ignore the null value as it does for non strict mode.

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