pn_concatenation = Node("pn_concatenation"
, Seq(pn_ident_or_term_or_pn_groups, NotNeed(","), TRef("pn_rhs", grammar=cur_grammar, flat=True))
, flat_eq_name=True, grammar=cur_grammar)
pn_alteration = Node("pn_alteration"
, Seq(pn_ident_or_term_or_pn_groups, NotNeed("|"), TRef("pn_rhs", grammar=cur_grammar, flat=True))
, flat_eq_name=True, grammar=cur_grammar)
pn_rhs = Node("pn_rhs", Or(pn_concatenation
, pn_alteration
, pn_groups
, pn_ident_or_term)
, grammar=cur_grammar)
pn_rule = Node("pn_rule", Seq(pn_lhs, NotNeed("="), pn_rhs, NotNeed(";")), grammar=cur_grammar)
pn_grammar = Node("ebnf_grammar", ZeroOrMore(pn_rule), grammar=cur_grammar)
#token_iterator = TokenIterator(TextReader(open("test1.txt"))
# , tt_list, tt_skip_list)
#token_reader = TokenReader(token_iterator)
#token_reader = TokenReader(TokenIterator(TextReader(open("test1.txt")), tt_list, tt_skip_list))
if __name__ == '__main__':
# SetRecursionLimit(5000)
# lexing with tokens reduces recursion level
rslt = pn_grammar.read_from(token_reader)
thing_pprint(rslt.readedlist)
, flat_eq_name=True, grammar=cur_grammar)
alteration = Node("alteration"
, Seq(ident_or_term_or_groups, NotNeed("|"), TRef("rhs", grammar=cur_grammar, flat=True))
, flat_eq_name=True, grammar=cur_grammar)
rhs = Node("rhs", Or( concatenation
, alteration
, groups
, ident_or_term)
, grammar=cur_grammar)
rule = Node("rule", Seq(lhs, NotNeed("="), rhs, NotNeed(";")), grammar=cur_grammar)
grammar = Node("ebnf_grammar", ZeroOrMore(rule), grammar=cur_grammar)
if __name__ == '__main__':
space = Node("space", Concat(OneOrMore(Or(" ", "\t", "\n"))), skip=True)
comment = Node("comment", Seq("(", "*"
, Node("text", Concat(ZeroOrMore(Not(Seq("*", ")")))))
, "*", ")")
, skip=True)
skip_pattern = OneOrMore(Or(space, comment))
tr = TextReader(open("ebnf_test.txt"), skip_pattern=skip_pattern)
#SetRecursionLimit(5000)
rslt = grammar.read_from(tr)
thing_pprint(rslt.readedlist)