# Copyright 2017 Google Inc.
# 
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
# 
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import 'util/byte.grm' as b;
import 'util/util.grm' as u;
import 'ru/verbalizer/numbers.grm' as n;

func ToNumberName[expr] {
  number_name_seq = n.CARDINAL_NUMBERS (" " n.CARDINAL_NUMBERS)*;
  return Optimize[expr @ number_name_seq];
}

d = b.kDigit;

leading_zero = CDRewrite[n.I[" "], ("[BOS]" | " ") "0", "", b.kBytes*];

by_ones = d n.I[" "];
by_twos = (d{2} @ leading_zero) n.I[" "];
by_threes = (d{3} @ leading_zero) n.I[" "];

groupings = by_twos* (by_threes | by_twos | by_ones);

export FRACTIONAL_PART_UNGROUPED =
  Optimize[ToNumberName[by_ones+ @ u.CLEAN_SPACES]]
;
export FRACTIONAL_PART_GROUPED =
  Optimize[ToNumberName[groupings @ u.CLEAN_SPACES]]
;
export FRACTIONAL_PART_UNPARSED = Optimize[ToNumberName[d*]];
