date.py

# Copyright (c) 2022 Xingchen Song (sxc19@tsinghua.org.cn)
#
# 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 pynini import accep, string_file
from pynini.lib.pynutil import delete, insert

from tn.processor import Processor
from tn.utils import get_abs_path


class Date(Processor):

    def __init__(self):
        super().__init__(name="date")
        self.build_tagger()
        self.build_verbalizer()

    def build_tagger(self):
        digit = string_file(get_abs_path("../itn/chinese/data/number/digit.tsv"))  # 1 ~ 9
        zero = string_file(get_abs_path("../itn/chinese/data/number/zero.tsv"))  # 0

        yyyy = digit + (digit | zero) ** 3  # 二零零八年
        yyy = digit + (digit | zero) ** 2  # 公元一六八年
        yy = (digit | zero) ** 2  # 零八年奥运会
        mm = string_file(get_abs_path("../itn/chinese/data/date/mm.tsv"))
        dd = string_file(get_abs_path("../itn/chinese/data/date/dd.tsv"))

        year = insert('year: "') + (yyyy | yyy | yy) + delete("年") + insert('" ')
        year_only = insert('year: "') + (yyyy | yyy | yy) + (accep("年") | accep("财年")) + insert('"')
        month = insert('month: "') + mm + insert('"')
        day = insert(' day: "') + dd + insert('"')

        # yyyy/mm/dd | yyyy/mm | mm/dd | yyyy
        date = ((year + month + day) | (year + month) | (month + day)) | year_only
        self.tagger = self.add_tokens(date)

    def build_verbalizer(self):
        addsign = insert("/")
        year = delete('year: "') + self.SIGMA + delete('" ')
        year_only = delete('year: "') + self.SIGMA + delete('"')
        month = delete('month: "') + self.SIGMA + delete('"')
        day = delete(' day: "') + self.SIGMA + delete('"')
        verbalizer = (year + addsign).ques + month + (addsign + day).ques
        verbalizer |= year_only
        self.verbalizer = self.delete_tokens(verbalizer)