Sequester Hyper StateNode
#39
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Move `StateNode` to `hyper/lex.c` as the only place where it is referenced. Rename `StateNode` to `IOState`. It is not a node. Introduce `IOStateManager` as a RAII type for reliable save/restore mechanism. Remove `save_scanner_state()` and `restore_scanner_state()` Introduce `IOStateStack` as a non-intrusive stack datatype based on C++ standard `std::stack`. Also save `line_number` which was forgotten as part of the IO state to save.
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Move
StateNodetohyper/lex.cas the only place where it is referenced.Rename
StateNodetoIOState. It is not a node.Introduce
IOStateManageras a RAII type for reliable save/restore mechanism. Removesave_scanner_state()andrestore_scanner_state()Introduce
IOStateStackas a non-intrusive stack datatype based on C++ standardstd::stack.Also save
line_numberwhich was forgotten as part of the IO state to save.