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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_preserve_order,
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)
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from pynini.lib import pynutil
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class MoneyFst(GraphFst):
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"""
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Finite state transducer for verbalizing money, e.g.
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money { integer_part: "twelve" fractional_part: "o five" currency: "dollars" } -> twelve o five dollars
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Args:
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decimal: DecimalFst
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deterministic: if True will provide a single transduction option,
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for False multiple transduction are generated (used for audio-based normalization)
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"""
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def __init__(self, decimal: GraphFst, deterministic: bool = True):
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super().__init__(name="money", kind="verbalize", deterministic=deterministic)
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keep_space = pynini.accep(" ")
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maj = pynutil.delete("currency_maj: \"") + pynini.closure(DAMO_NOT_QUOTE, 1) + pynutil.delete("\"")
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min = pynutil.delete("currency_min: \"") + pynini.closure(DAMO_NOT_QUOTE, 1) + pynutil.delete("\"")
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fractional_part = (
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pynutil.delete("fractional_part: \"") + pynini.closure(DAMO_NOT_QUOTE, 1) + pynutil.delete("\"")
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)
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integer_part = decimal.integer
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# *** currency_maj
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graph_integer = integer_part + keep_space + maj
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# *** currency_maj + (***) | ((and) *** current_min)
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fractional = fractional_part + delete_extra_space + min
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if not deterministic:
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fractional |= pynutil.insert("and ") + fractional
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graph_integer_with_minor = integer_part + keep_space + maj + keep_space + fractional + delete_preserve_order
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# *** point *** currency_maj
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graph_decimal = decimal.numbers + keep_space + maj
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# *** current_min
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graph_minor = fractional_part + delete_extra_space + min + delete_preserve_order
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graph = graph_integer | graph_integer_with_minor | graph_decimal | graph_minor
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if not deterministic:
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graph |= graph_integer + delete_preserve_order
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delete_tokens = self.delete_tokens(graph)
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self.fst = delete_tokens.optimize()
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