[stringtemplate-interest] Anonymous template inside another anonymous template

[Morten Olav Hansen]

Hi! Yes, of course.

I'm extending Java 1.5 with UML State Machine support, and is using
the ANTLR3 TokenRewriteStream to rewrite the source from my extended
version, to a version of Java that is compilable. I'm doing this, so
that I can only rewrite the parts I need, and just grab the text of
the rest.

So my input is usually like this:


class ABC {
	region {
		state s {
			region {
				state s { regions, etc }
			}

			region {
				state s { regions, etc }
			}
	}

        /* normal javacode below here */
}

And I want it flattened to something like this (very simplified, the
names are the important part here)

class ABC {
	private _construct_sm() {
		region r0;
		state r0_s;
		region r0_s_r0;
		state r0_s_r0_s;
		region r0_s_r1;
		state r0_s_r1_s;
	}

        /* more javacode below */
}

I was using a prefix argument to create the names of the variables,
but I'm facing the problem outlined before.

The general setup of my templates are like this:
KEYWORD_builder(keyword, prefix) ::= <<
generate text for template here, and if calling another template, add
something to the prefix.
>>

I can solve this changing prefix to keyword_prefix, but this quickly
stops working because of recursion (when the same template is called
several times).

Regards,
Morten

On Fri, Dec 3, 2010 at 1:33 AM, Terence Parr <parrt at cs.usfca.edu> wrote:
> Howdy.  Can you explain more at the high level of what you're trying to do?  are you passing down a recursion chain a bigger and bigger arg?
>
> I'm finding now that when I want recursion, i'm walking the model with the template; less good.  I recurse or traverse my model and build a tree of embedded templates rather than having the template invoke itself.
>
> Ter
> On Dec 2, 2010, at 2:52 PM, Morten Olav Hansen wrote:
>
>> After more digging around, it seems that the problem is that i have
>> recursive templates with the same arguments.
>>
>> Something like this fails:
>> a(prefix) ::= <<
>> <b(prefix={added_<prefix>}>
>>>>
>>
>> b(prefix) ::= <<
>> <prefix> ...
>>>>
>>
>> but using b_prefix instead works fine.
>>
>> The problem I'm facing is that I have recursion, and I can't create a
>> template for every possible level.
>>
>> Any suggestions on how to fix this?
>>
>> Regards,
>> Morten
>>
>> On Thu, Nov 25, 2010 at 9:44 PM, Morten Olav Hansen <mortenoh at gmail.com> wrote:
>>> Hi
>>>
>>> Is it possible to have an anonymous template inside another template
>>> somehow? I'm trying to generate an argument to a template (which is
>>> called from an anonymous template).
>>>
>>> I have something like this:
>>>
>>> <r.states: {s|<state_builder(state=s, region_ns={r<region_n>})>}>
>>>
>>> But i get an exception:
>>> Exception in thread "main" java.lang.IllegalArgumentException: cannot
>>> embed template <anonymous template argument> in itself
>>>
>>> I'm just passing region_ns=region_n now and adding the r on the
>>> template side (and this works), but this argument will potentially
>>> have several arguments concatenated together.
>>>
>>> Regards,
>>> Morten
>>>
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