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import pynini
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from fun_text_processing.text_normalization.en.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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from pynini.lib import pynutil
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class DateFst(GraphFst):
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"""
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Finite state transducer for verbalizing date, e.g.
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date { month: "january" day: "5" year: "2012" preserve_order: true } -> february 5 2012
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date { day: "5" month: "january" year: "2012" preserve_order: true } -> 5 february 2012
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"""
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def __init__(self):
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super().__init__(name="date", kind="verbalize")
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month = (
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pynutil.delete("month:")
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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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day = (
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pynutil.delete("day:")
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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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year = (
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pynutil.delete("year:")
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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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+ delete_space
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+ pynutil.delete("\"")
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)
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# month (day) year
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graph_mdy = (
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month + pynini.closure(delete_extra_space + day, 0, 1) + pynini.closure(delete_extra_space + year, 0, 1)
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)
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# (day) month year
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graph_dmy = (
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pynini.closure(day + delete_extra_space, 0, 1) + month + pynini.closure(delete_extra_space + year, 0, 1)
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)
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optional_preserve_order = pynini.closure(
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pynutil.delete("preserve_order:") + delete_space + pynutil.delete("true") + delete_space
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| pynutil.delete("field_order:")
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+ delete_space
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+ pynutil.delete("\"")
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+ DAMO_NOT_QUOTE
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+ pynutil.delete("\"")
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+ delete_space
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)
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final_graph = (graph_mdy | year | graph_dmy) + delete_space + optional_preserve_order
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delete_tokens = self.delete_tokens(final_graph)
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self.fst = delete_tokens.optimize()
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