On 07/19/2019 01:23 AM, Antoon Pardon wrote:
I don't seem to have made myself clear. The grammar with its Terminals
and NonTerminals is read in from a file. The program doesn't know what
they will be.
For the moment what I am thinking about is something as follows:
grammar = LoadGrammer(GrammarFile)
EnumList = ['class NonTerminal(Enum):\n']
for Index, NonTerminal in enumerate(grammar.NonTerminals):
EnumList.append(' %s = %d\n' % (NonTerminal, Index))
exec(''.join(EnumList), ..., ...)
The problem with this approach is that I can't use these values until
the whole grammer is loaded. I would prefer some way to add values
during the loading of the grammar.
Ah, you want `extend_enum` from the aenum library:
class NonTerminal(Enum):
pass
while reading_grammar:
non_terminal = ....
index = ....
extend_enum(NonTerminal, non_terminal, index)
See also:
- https://stackoverflow.com/a/33680929/208880
- https://stackoverflow.com/a/35899963/208880
- https://stackoverflow.com/a/36918171/208880
- https://stackoverflow.com/a/43004033/208880
--
~Ethan~
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