[antlr-interest] Not generating parts of AST (argh!)

[Paul J. Lucas]

On Sun, 24 Oct 2004, Monty Zukowski wrote:

> Try -traceParser when you run antlr.tool.  What tree is mulExpr 
> returninng?

	Exactly what it should.  After yet more time spent in the
	debugger, I discovered that I had a rule like this as its
	parent:

		comparisonExpr!
		{
		    boolean gotR2 = false;
		}
		    : re1:rangeExpr
		      (co:comparisonOp re2:rangeExpr { gotR2 = true; })?
		      	{
			    if ( gotR2 )
			    	#comparisonExpr = #(co, re1, re2)
			    else
			    	#comparisonExpr = #(re1); // <-- bug
			}
		    ;

	The "bug" line should read:

			    	#comparisonExpr = #re1; // no ()

	Damn parentheses!  Anyway, is there a simpler way to do the
	above (without the boolean gotR2 flag)?

	- Paul



 
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