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From "Nathan Bubna (JIRA)" <...@velocity.apache.org>
Subject [jira] Commented: (VELOCITY-619) New set modifier so that set only assigns a value when variable is not defined.
Date Thu, 02 Oct 2008 20:59:45 GMT

    [ https://issues.apache.org/jira/browse/VELOCITY-619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12636464#action_12636464
] 

Nathan Bubna commented on VELOCITY-619:
---------------------------------------

Not being able to use #if like that in strict mode might confuse people too.  I actually didn't
fully realize/notice that the patch for VELOCITY-618 would make #if( $foo ) throw an error
in strict mode.  i use #if to check if a variable is present as often as i use it to check
if a variable is true or false.

My preference would be to allow #if( $foo ) even in strict mode.  Then this behaviour is possible
without introducing any backwards compatibility concerns.    We can re-examine this if/when
someone gets a 2.0 version started.  Then backwards compatibility is not much of a concern.

> New set modifier so that set only assigns a value when variable is not defined.
> -------------------------------------------------------------------------------
>
>                 Key: VELOCITY-619
>                 URL: https://issues.apache.org/jira/browse/VELOCITY-619
>             Project: Velocity
>          Issue Type: Improvement
>          Components: Engine
>            Reporter: Byron Foster
>         Attachments: setBangModifier_2.patch
>
>
> Define a new #set modifier such that a variable is only set if it is not defined, like
so:
> #set($!foo = "bar")
> If the '!' character proceeds the variable foo, then $foo will be set with the value
of "bar" ONLY IF $foo is not defined (is not in the context).  Otherwise if $foo is defined
it will remain unchanged.

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