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import pynini
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from fun_text_processing.text_normalization.en.graph_utils import DAMO_NOT_QUOTE, GraphFst, delete_space
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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
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e.g. time { hours: "02:15" } -> "02:15"
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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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hour = (
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pynutil.delete("hours: ") + pynutil.delete("\"") + pynini.closure(DAMO_NOT_QUOTE, 1) + pynutil.delete("\"")
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)
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minutes = (
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pynutil.delete("minutes: ")
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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_preserve_order = pynutil.delete("hours: \"") + pynini.closure(DAMO_NOT_QUOTE, 1) + pynutil.delete("\"")
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# for cases that require permutations for the correct verbalization
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graph_reverse_order = hour + delete_space + pynutil.insert(":") + minutes + delete_space
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graph = graph_preserve_order | graph_reverse_order
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delete_tokens = self.delete_tokens(graph)
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self.fst = delete_tokens.optimize()
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