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From "Daniel Dekany (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (FREEMARKER-69) Chinese:自定义Directive与Variable变量名称一致导致FTL解析BUG,English:A bug when The user-defined directive key same as Variable key
Date Fri, 11 Aug 2017 11:44:00 GMT

    [ https://issues.apache.org/jira/browse/FREEMARKER-69?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16123223#comment-16123223
] 

Daniel Dekany edited comment on FREEMARKER-69 at 8/11/17 11:43 AM:
-------------------------------------------------------------------

It's a design decision in FreeMarker that user defined directives (including macros) and user
defined functions are just variables. They all use the same namespace.  To be more precise,
directives and functions are first class values, that is, you can pass them around just like
strings or numbers or anything else. So with {{<#macro foo>}} you create a value of
type macro, and then assign that to the variable {{foo}} (similarly as {{<#assign foo =
...>}}).

Many other languages do the same, but of course different people prefer different approaches
(hence I marked this as "Not A Problem"). But surely changing this is not backward compatible.


was (Author: ddekany):
It's a design decision in FreeMarker that user defined directives (including macros) and user
defined functions are just variables. They all use the same namespace.  To be more precise,
directives and functions are first class values, that is, you can pass them around just like
strings or numbers or anything else. So with {{<#macro foo>}} you create a value of
type macro, and then assign that to the variable {{foo}} (similarly as {{<#assign foo =
...>}}).

Many other languages does the same, but of course different people prefer different approaches.
But surely changing this is not backward compatible.

> Chinese:自定义Directive与Variable变量名称一致导致FTL解析BUG,English:A
bug when The  user-defined directive key same as Variable key 
> ----------------------------------------------------------------------------------------------------------------------
>
>                 Key: FREEMARKER-69
>                 URL: https://issues.apache.org/jira/browse/FREEMARKER-69
>             Project: Apache Freemarker
>          Issue Type: Bug
>            Reporter: pengzhistar
>            Priority: Minor
>         Attachments: Freemarker.rar
>
>
> Exception info:
> For "@" callee: Expected a(n) user-defined directive, transform or macro, but this has
evaluated to a sequence (wrapper: f.t.SimpleSequence): 
> Advise:
> Chinese:将directive对象和临时变量对象分开存储
> English: Separately store directive objects and temporary variable objects 



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