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import pynini
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from fun_text_processing.text_normalization.en.graph_utils import DAMO_NOT_QUOTE, GraphFst
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from pynini.lib import pynutil
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class CardinalFst(GraphFst):
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"""
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Finite state transducer for verbalizing cardinals
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e.g. cardinal { integer: "zwei" } -> "zwei"
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Args:
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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, deterministic: bool = True):
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super().__init__(name="cardinal", kind="verbalize", deterministic=deterministic)
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optional_sign = pynini.closure(pynini.cross("negative: \"true\" ", "minus "), 0, 1)
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self.optional_sign = optional_sign
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integer = pynini.closure(DAMO_NOT_QUOTE, 1)
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self.integer = pynutil.delete(" \"") + integer + pynutil.delete("\"")
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integer = pynutil.delete("integer:") + self.integer
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self.numbers = integer
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graph = optional_sign + self.numbers
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delete_tokens = self.delete_tokens(graph)
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self.fst = delete_tokens.optimize()
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