After hours of struggling yesterday I realised that I would gain a lot if I switch to the CUP/LEX version of the parser.
So it seems I must start going on the way of having a more robust parser, but that will delay again the upgrade. I will keep you updated on the progress. It wouldn't be a full rewrite, I'm planning to keep as much from the current Antlr 2 code as it is possible, so I expect to finish that this week.
But unfortunately I can develop only on my EEE Pc with a slow SSD while commuting to work (that means like 2 hours a day), and yesterday it took almost an hour just to download and install the latest java...
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