[il-antlr-interest: 24557] Re: [antlr-interest] stringtemplate & tree walkers

Wed, 08 Jul 2009 08:48:18 -0700

alexander wrote: 
sorry to bother again ...

i downloaded antlr's sources and a
grep -r "output \?= \?template" `find -name *.g*`

to find any grammars with output=template results in one reference, 
which is commented out:
./tool/src/main/antlr/org/antlr/grammar/v3/ActionTranslator.g:  // 
output=template;  TODO: can we make tokens return templates somehow?

Terence Parr schrieb:
  
also codegen.g
    
do you mean
tool/src/main/antlr2/org/antlr/grammar/v2/codegen.g ?

there is no output using the -> operator :(

however, i was able to get things started(jihaaa).

now i'm looking for a nice solution for something like this:
somerule
     : a=something (b=maybe)?
         -> sometemplate(a={$a.st}, b={$b.st})
     ;
here the b is optional, if it's not there b.st will raise a npe.

 :           {
		$st = %sometemplate();
	}
	a=something              { %{$st}.a = $a;  }
		(
			{b=maybe { %{$st}.b = $b;  }
		)?

or
a=something 
      (  b=maybe
         -> sometemplate(a={$a.st}, b={$b.st})
       | -> sometemplate(a={$a.st})
      )


sometemplate(a, b) ::=
<<
<if(b)>b was here<endif>
......
>>


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