Adding and removing rules from a grammar about earley-parser-js HOT 1 OPEN

@jarble Excuse me for a bit delayed response.

Currently, Grammar object is implemented in such way, that it encapsulates a data structure with all grammar productions - indexed by nonterminal symbols (the left hand side of grammar rules).
For example, grammar productions S -> S add_sub M | M and N -> S lt_gt S | S are internally represented in the following way:

{
  'S': [['S', 'add_sub', 'M'], ['M']],
  'N': [['S', 'lt_gt', 'S'], ['S']],
}

Please, check the source code of the constructor of Grammar objects for more implementation details: https://github.com/lagodiuk/earley-parser-js/blob/master/earley-oop.js#L4-L23

Given code can be reused for parsing of the new rules, and addition of them to the dictionary with already existing rules.

I will try to find a time within nearest days - to implement requested feature. However, a pull request with this feature will be appreciated as well.

from earley-parser-js.