# 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 DAMO_CHAR, GraphFst, delete_space
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from pynini.lib import pynutil
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class MeasureFst(GraphFst):
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"""
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Finite state transducer for verbalizing measure, e.g.
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measure { negative: "true" cardinal { integer: "12" } units: "kg" } -> -12 kg
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Args:
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decimal: DecimalFst
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cardinal: CardinalFst
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"""
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def __init__(self, decimal: GraphFst, cardinal: GraphFst):
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super().__init__(name="measure", kind="verbalize")
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optional_sign = pynini.closure(pynini.cross("negative: \"true\"", "-"), 0, 1)
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unit = (
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pynutil.delete("units:")
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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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+ delete_space
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)
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graph_decimal = (
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pynutil.delete("decimal {")
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+ delete_space
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+ optional_sign
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+ delete_space
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+ decimal.numbers
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+ delete_space
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+ pynutil.delete("}")
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)
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graph_cardinal = (
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pynutil.delete("cardinal {")
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+ delete_space
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+ optional_sign
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+ delete_space
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+ cardinal.numbers
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+ delete_space
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+ pynutil.delete("}")
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)
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graph = (graph_cardinal | graph_decimal) + delete_space + unit
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delete_tokens = self.delete_tokens(graph)
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self.fst = delete_tokens.optimize()
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