It looks like I missed a few posts on this topic from a few days ago
(Thanks, Jim!)
The suggestion appears to pass, for a tree grammar rule like:
expression returns[ExpressionValue eval]
:
^(PLUS left = expression right = expression)
to use $e.tree and then get the line and column info.
On the Java target, the following:
CommonTree tree = $left.tree;
generates:
CommonTree tree = (left!=null?((CommonTree)left.tree):null);
But there is no variable called tree (apparently). There is, however, a
"getTree()" function, but it doesn't look like ANTLR automatically
translates it into that form, so I assume that's not its intended use. If,
however, I hack the generated code and put in something similar to
(CommonTree)left.getTree()) the result appears to always be null.
Jim, does your solution have some preconditions I'm not seeing?
Andy
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