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https://issues.apache.org/jira/browse/VELOCITY-926?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Claude Brisson resolved VELOCITY-926.
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Resolution: Fixed
Fixed by commit 1873244.
Deprecate velocimacro.arguments.preserve_literals in favor of the new
{{velocimacro.enable_bc_mode flag,
which mimics 1.7 velocimacro behavior:
- preserve arguments literals:
#macro(m $arg) $arg #end
m($null)
will displays $arg w/o bc mode and $null with bc mode
- use global defaults for missing arguments:
#macro(m $foo) $foo #end
#set($foo='foo')
#m()
will display $foo w/o bc mode and 'foo' with bc mode
The following use cases have been left aside from backward compatibility:
- preserving local macro scope values
#macro(test) #set($foo = 'foo')
$some_tool.change_foo_value_in_global_context_to_bar() $foo #end
#test()
will always display 'bar', while 1.7 displayed 'foo'
- setting a null argument to null, while argument name exists in context,
#macro(setnull $foo) #set($foo = $null) #end
#set($foo='foo')
#setnull($null)
$foo
Will always display 'foo' (w or w/o bc mode), while 1.7 did display $foo
> Regression: Macro arguments names cannot collide with external references
> names
> -------------------------------------------------------------------------------
>
> Key: VELOCITY-926
> URL: https://issues.apache.org/jira/browse/VELOCITY-926
> Project: Velocity
> Issue Type: Bug
> Components: Engine
> Affects Versions: 2.0, 2.1
> Reporter: Claude Brisson
> Assignee: Claude Brisson
> Priority: Major
> Fix For: 2.2
>
>
> Consider the following example:
> {code}
> #macro( test $foo $bar )
> $foo $bar
> #end
> #set($foo = 'foo')
> #set($bar = 'bar')
> #test( $bar, $foo )
> {code}
> The expected result would be "{{bar foo}}", but since 2.0 we get the
> incorrect result "{{bar bar}}", as if the first inner {{$foo}} macro argument
> was overwritting the second argument evaluation.
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