On Sat, Nov 26, 2011 at 9:58 AM, franck102 <franck...@yahoo.com> wrote:
> In fact the tree has been constructed by the leading (ID->ID), That tree only exists inside your parenthesis, AFAIK. You can't reference it outside it (well, you can, but it will be `null`). So here is exactly what I am trying to do, there is probably a better way > than what I have (untested pseudo-grammer, but you should get the idea): > > expr > : ( prefix -> prefix ) ( suffix -> /* *insert prefix as first child > of suffix and return suffix * */ ) * > > prefix : ID; > > suffix > : DOT ID -> ^( DOT ID ) > | '[' expr ']' -> ^( INDEX expr ) > > I guess I could use a scope to pass down the prefix; or have suffix return > both the root type and a flat list and build the tree in expr; but both > seem > painful to get right typing wise... > > Yes, it's a pain compared to simple passing the tree as a parameter, but that's the "penalty" for turning on global backtracking [1]. Bart. [1] http://www.antlr.org/wiki/display/ANTLR3/How+to+remove+global+backtracking+from+your+grammar List: http://www.antlr.org/mailman/listinfo/antlr-interest Unsubscribe: http://www.antlr.org/mailman/options/antlr-interest/your-email-address -- You received this message because you are subscribed to the Google Groups "il-antlr-interest" group. To post to this group, send email to il-antlr-inter...@googlegroups.com. To unsubscribe from this group, send email to il-antlr-interest+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/il-antlr-interest?hl=en.