# 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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from fun_text_processing.inverse_text_normalization.zh.graph_utils import (
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DAMO_NOT_QUOTE,
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GraphFst,
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delete_extra_space,
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delete_space,
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)
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import pynini
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from pynini.lib import pynutil
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class FractionFst(GraphFst):
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"""
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Finite state transducer for verbalizing fraction,
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"""
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def __init__(self):
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super().__init__(name="fraction", kind="verbalize")
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optional_sign = pynini.closure(pynini.cross('negative: "true"', "-") + delete_space, 0, 1)
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numerator = (
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pynutil.delete('numerator:')
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+ delete_space
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+ pynutil.delete("\"")
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+ pynini.closure(DAMO_NOT_QUOTE, 1)
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+ pynutil.delete("\"")
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)
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denominator = (
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pynutil.delete('denominator:')
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+ delete_space
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+ pynutil.delete("\"")
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+ pynini.closure(DAMO_NOT_QUOTE, 1)
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+ pynutil.delete("\"")
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)
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graph = (optional_sign + numerator + delete_space + pynutil.insert("/") + denominator).optimize()
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self.numbers = graph
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delete_tokens = self.delete_tokens(optional_sign + graph)
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self.fst = delete_tokens.optimize()
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