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# Copyright (c) 2021, NVIDIA CORPORATION. All rights reserved.
# Copyright 2015 and onwards 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.
from text_processing.vi.graph_utils import (
NEMO_NOT_QUOTE,
GraphFst,
delete_space,
)
try:
import pynini
from pynini.lib import pynutil
PYNINI_AVAILABLE = True
except (ModuleNotFoundError, ImportError):
PYNINI_AVAILABLE = False
class FractionFst(GraphFst):
"""
Finite state transducer for verbalizing fraction,
e.g. fraction { numerator: "2" denominator: "3" } } -> 2/3
e.g. fraction { numerator: "20" denominator: "3" negative: "true"} } -> 2/3
"""
def __init__(self):
super().__init__(name="fraction", kind="verbalize")
optional_sign = pynini.closure(pynini.cross('negative: "true"', "-") + delete_space, 0, 1)
numerator = pynutil.delete('numerator: "') + pynini.closure(NEMO_NOT_QUOTE, 1) + pynutil.delete('"')
denominator = (
pynutil.insert("/")
+ pynutil.delete('denominator: "')
+ pynini.closure(NEMO_NOT_QUOTE, 1)
+ pynutil.delete('"')
)
graph = (numerator + delete_space + denominator).optimize()
self.numbers = graph
delete_tokens = self.delete_tokens(optional_sign + graph)
self.fst = delete_tokens.optimize()
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