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2012-11-07simplified/cleaned up undo operations on value stackRobin Haberkorn1-4/+4
* special undo tokens are private to the ValueStack class and automatically parameterized * undo_push() and undo_pop() methods hide the internals of pushing the undo tokens
2012-11-07fixed "," operatorRobin Haberkorn1-18/+23
instead of pushing a special number (which wasn't that special...), use a dedicated "new" operator which does not count as an argument operator, nor does it count as an ordinary operator and it is popped before any number (and "number" operator) is pushed
2012-11-07expression stack fixes and some arithmetic commandsRobin Haberkorn1-2/+4
2012-11-07expression stack based on THECO's ArithmeticStackRobin Haberkorn1-0/+184