# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import pynini
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from fun_text_processing.inverse_text_normalization.zh.graph_utils import (
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DAMO_CHAR,
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DAMO_DIGIT,
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GraphFst,
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delete_space,
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insert_space,
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)
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from pynini.lib import pynutil
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class TimeFst(GraphFst):
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"""
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Finite state transducer for verbalizing time, e.g.
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time { hours: "12" minutes: "30" } -> 12:30
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time { hours: "1" minutes: "12" } -> 01:12
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time { hours: "2" suffix: "a.m." } -> 02:00 a.m.
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"""
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def __init__(self):
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super().__init__(name="time", kind="verbalize")
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add_leading_zero_to_double_digit = (DAMO_DIGIT + DAMO_DIGIT) | (pynutil.insert("0") + DAMO_DIGIT)
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hour = (
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pynutil.delete("hour:")
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+ delete_space
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+ pynutil.delete("\"")
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+ pynini.closure(DAMO_DIGIT, 1)
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+ pynutil.delete("\"")
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)
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minute = (
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pynutil.delete("minute:")
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+ delete_space
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+ pynutil.delete("\"")
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+ pynini.closure(DAMO_DIGIT, 1)
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+ pynutil.delete("\"")
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)
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second = (
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pynutil.delete("second:")
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+ delete_space
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+ pynutil.delete("\"")
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+ pynini.closure(DAMO_DIGIT, 1)
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+ pynutil.delete("\"")
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)
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suffix = (
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delete_space
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+ pynutil.insert(" ")
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+ pynutil.delete("noon:")
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+ delete_space
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+ pynutil.delete("\"")
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+ pynini.closure(DAMO_CHAR - " ", 1)
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+ pynutil.delete("\"")
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)
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optional_suffix = pynini.closure(suffix, 0, 1)
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zone = (
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delete_space
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+ pynutil.insert(" ")
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+ pynutil.delete("zone:")
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+ delete_space
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+ pynutil.delete("\"")
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+ pynini.closure(DAMO_CHAR - " ", 1)
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+ pynutil.delete("\"")
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)
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optional_zone = pynini.closure(zone, 0, 1)
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graph = (
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hour @ add_leading_zero_to_double_digit
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+ delete_space
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+ pynutil.insert(":")
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+ (minute @ add_leading_zero_to_double_digit)
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+ (pynutil.insert(":") + second @ add_leading_zero_to_double_digit).ques
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+ optional_suffix
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+ optional_zone
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)
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delete_tokens = self.delete_tokens(graph)
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self.fst = delete_tokens.optimize()
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