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Now some problems are fixed.
It can now read grammar correctly (hopefully) from a file, in the BNF
format. And strings (terminals) are handled fine as well. So glad
that there are no leak problems now.
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Now we can read grammars from a file.
But we need to check if it works for reading strings still.
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The current representation of the grammar is the most primitive BNF.
This is the simplest to implement, but is difficult to cope with user
requirements. Moreover, I find another paper describing the GLR
algorithm, so I need to think about the representation of the grammar
more. In particular, I would like the generation of the grammar to be
incremental, so per chance its data type should be adapted
accordingly.
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Now the rough framework is established and the grammar class is sort
of ready.
It remains to write a general input reading mechanism.
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