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import pynini
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from fun_text_processing.inverse_text_normalization.vi.graph_utils import DAMO_NOT_QUOTE, GraphFst, delete_space
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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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e.g. fraction { numerator: "2" denominator: "3" } } -> 2/3
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e.g. fraction { numerator: "20" denominator: "3" negative: "true"} } -> 2/3
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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 = pynutil.delete('numerator: "') + pynini.closure(DAMO_NOT_QUOTE, 1) + pynutil.delete('"')
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denominator = (
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pynutil.insert("/")
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+ pynutil.delete('denominator: "')
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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 = (numerator + delete_space + 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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