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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_CHAR,
NEMO_DIGIT,
GraphFst,
delete_space,
insert_space,
)
try:
import pynini
from pynini.lib import pynutil
PYNINI_AVAILABLE = True
except (ModuleNotFoundError, ImportError):
PYNINI_AVAILABLE = False
class TimeFst(GraphFst):
"""
Finite state transducer for verbalizing time, e.g.
time { hours: "3" } -> 3h
time { hours: "12" minutes: "30" } -> 12:30
time { hours: "1" minutes: "12" second: "22"} -> 1:12:22
time { minutes: "36" second: "45"} -> 36p45s
time { hours: "2" zone: "gmt" } -> 2h gmt
"""
def __init__(self):
super().__init__(name="time", kind="verbalize")
add_leading_zero_to_double_digit = (NEMO_DIGIT + NEMO_DIGIT) | (pynutil.insert("0") + NEMO_DIGIT)
hour = (
pynutil.delete("hours:")
+ delete_space
+ pynutil.delete('"')
+ pynini.closure(NEMO_DIGIT, 1)
+ pynutil.delete('"')
)
minute = (
pynutil.delete("minutes:")
+ delete_space
+ pynutil.delete('"')
+ pynini.closure(NEMO_DIGIT, 1)
+ pynutil.delete('"')
)
second = (
pynutil.delete("seconds:")
+ delete_space
+ pynutil.delete('"')
+ pynini.closure(NEMO_DIGIT, 1)
+ pynutil.delete('"')
)
zone = (
delete_space
+ insert_space
+ pynutil.delete("zone:")
+ delete_space
+ pynutil.delete('"')
+ pynini.closure(NEMO_CHAR - " ", 1)
+ pynutil.delete('"')
)
optional_zone = pynini.closure(zone, 0, 1)
optional_second = pynini.closure(
delete_space + pynutil.insert(":") + (second @ add_leading_zero_to_double_digit),
0,
1,
)
graph_h = hour + pynutil.insert("h")
graph_hms = (
hour + delete_space + pynutil.insert(":") + (minute @ add_leading_zero_to_double_digit) + optional_second
)
graph_ms = (
minute
+ delete_space
+ pynutil.insert("p")
+ (second @ add_leading_zero_to_double_digit)
+ pynutil.insert("s")
)
graph = (graph_h | graph_ms | graph_hms) + optional_zone
delete_tokens = self.delete_tokens(graph)
self.fst = delete_tokens.optimize()
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