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From Matt Benson <gudnabr...@yahoo.com>
Subject Re: recursive expansion of property names
Date Wed, 23 Jun 2004 22:39:46 GMT
The code is easy enough... maintaining
backwards-compatibility is something else.  Hence my
comment about doing it right.  You can search the dev
archives around 6/3 or 6/4 for a post originated by
Jack G. Woehr on this subject for more detail (I'm
going home :)  ).

-Matt

--- Jeffrey Bacon <jbacon@magmic.com> wrote:
> looking at the Ant source code, I think all I have
> to do is add one line 
> and it should do tiered property replacements.  Not
> sure if it breaks 
> anything but since current behavior in this case
> would be to return 
> "${...}" a the string, which is probably not what
> people were looking 
> for if they used "${${propname}}" anyway, I think it
> _should_ be safe.
> 
> line: 276 (in Ant 1.6.1 code)
>
org.apache.tools.ant.PropertyHelper#replaceProperties(String,
> ns, String 
> value, Hashtable keys)
> ....
>                  if (replacement == null) {
>                      project.log("Property ${" +
> propertyName
>                              + "} has not been set",
> Project.MSG_VERBOSE);
>                  }
> ....
> 
> if I just add this before that line it should do it:
> 
>    if (replacement == null) {
>      replacement = replaceProperties(ns,
> propertyName, keys);
>    }
> 
> 
> this is probably more a dev forum type issue though.
> --
> Jeffrey Bacon
> jbacon@magmic.com
> Creative Developer
> http://www.magmic.com
> 
> 
> Matt Benson wrote:
> > About three weeks ago there was a discussion on
> the
> > dev list about how to allow recursive property
> > expansion without breaking everything.  So it's on
> the
> > radar, but it's not necessarily easy to do
> (right).
> > 
> > -Matt 
> > 
> > --- Jeffrey Bacon <jbacon@magmic.com> wrote:
> > 
> >>I know I can merge the 2 properties into a 3rd
> >>property to get the final 
> >>value but I was hoping that I would be able to do
> it
> >>without increasing 
> >>the number of properties I use by 50%.  With the
> >>property copy thing, I 
> >>have to create a new property name for each pair
> of
> >>properties I want to 
> >>reference this way.
> >>--
> >>Jeffrey Bacon
> >>jbacon@magmic.com
> >>Creative Developer
> >>http://www.magmic.com
> >>
> >>
> >>Matt Benson wrote:
> >>
> >>>See
> >>>
> >>
> >
>
http://ant.apache.org/faq.html#propertyvalue-as-name-for-property
> > 
> >>>-Matt
> >>>
> >>>--- Jeffrey Bacon <jbacon@magmic.com> wrote:
> >>>
> >>>
> >>>>sorry, I should be more specific:
> >>>>
> >>>>I have a properties file:
> >>>>
> >>>>projects = com.magmic
> >>>>com.magmic.name = APIs
> >>>>
> >>>>and I load that in Ant.
> >>>>
> >>>>I want to access com.magmic.name by using the
> >>>>projects property:
> >>>>
> >>>><echo>${${projects}.name}</echo>
> >>>>
> >>>>I want that to print "APIs".  Is there some way
> to
> >>>>effect that?
> >>>>
> >>>>--
> >>>>Jeffrey Bacon
> >>>>jbacon@magmic.com
> >>>>Creative Developer
> >>>>http://www.magmic.com
> >>>>
> >>>>
> >>>>Jeffrey Bacon wrote:
> >>>>
> >>>>
> >>>>>Can I effect the below behavior somehow to get
> it
> >>>>
> >>>>to print 'hello'?
> >>>>
> >>>>
> >>>>><property name="prop1" value="prop2" />
> >>>>><property name="prop2" value="hello" />
> >>>>><echo>${{prop1}}</echo>
> >>>>
> >>>>
> >
>
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