[antlr-interest] Re: Building trees with the correct associativity

[Paul J. Lucas]

On Thu, 2 Dec 2004, lgcraymer wrote:

> addExpr:
>     :
>     mulExpr (addOp mulExpr)*
>     ;

	This elides the tree-building code, a la:

		## = #([ADD_EXPR,"ADD_EXPR", ao, e1 e2);

	If I add that in inside the ()*, the ## gets its value
	overwritten (as Terence noted and I subsequently corrected).

> addExpr
>     :
>     mulExpr (addOp addExpr)*
>     ;

	This is what I actually have now (as I corrected myself in a
	previous e-mail).  This doesn't work.

	I want an ADD_EXPR to be present in the tree only if an
	expression actually contains an addOp thus prodicing "compact"
	trees without lots of useless intervening nodes.

	- Paul



 
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