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# coding=utf-8
# Copyright 2021 Artem Ploujnikov


# Lint as: python3
import json

import datasets

_DESCRIPTION = """\
Grapheme-to-Phoneme training, validation and test sets
"""

_BASE_URL = "https://huggingface.co/datasets/flexthink/librig2p-nostress-space/resolve/main/dataset"
_HOMEPAGE_URL = "https://huggingface.co/datasets/flexthink/librig2p-nostress-space"
_NA = "N/A"
_SPLIT_TYPES = ["train", "valid", "test"]
_DATA_TYPES = ["lexicon", "sentence", "homograph"]
_SPLITS = [
    f"{data_type}_{split_type}"
    for data_type in _DATA_TYPES
    for split_type in _SPLIT_TYPES
]


class GraphemeToPhoneme(datasets.GeneratorBasedBuilder):
    def __init__(self, base_url=None, splits=None, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.base_url = base_url or _BASE_URL
        self.splits = splits or _SPLITS

    def _info(self):
        return datasets.DatasetInfo(
            description=_DESCRIPTION,
            features=datasets.Features(
                {
                    "sample_id": datasets.Value("string"),
                    "speaker_id": datasets.Value("string"),
                    "origin": datasets.Value("string"),
                    "char": datasets.Value("string"),
                    "phn": datasets.Sequence(datasets.Value("string")),
                    "homograph": datasets.Value("string"),
                    "homograph_wordid": datasets.Value("string"),
                    "homograph_char_start": datasets.Value("int32"),
                    "homograph_char_end": datasets.Value("int32"),
                    "homograph_phn_start": datasets.Value("int32"),
                    "homograph_phn_end": datasets.Value("int32"),
                },
            ),
            supervised_keys=None,
            homepage=_HOMEPAGE_URL,
        )

    def _get_url(self, split):
        return f"{self.base_url}/{split}.json"

    def _split_generator(self, dl_manager, split):
        url = self._get_url(split)
        path = dl_manager.download_and_extract(url)
        return datasets.SplitGenerator(
            name=split, gen_kwargs={"datapath": path, "datatype": split},
        )

    def _split_generators(self, dl_manager):
        return [self._split_generator(dl_manager, split) for split in self.splits]

    def _generate_examples(self, datapath, datatype):
        with open(datapath, encoding="utf-8") as f:
            data = json.load(f)
        for sentence_counter, (sample_id, item) in enumerate(data.items()):
            resp = {
                "sample_id": sample_id,
                "speaker_id": str(item.get("speaker_id") or _NA),
                "origin": item["origin"],
                "char": item["char"],
                "phn": item["phn"],
                "homograph": item.get("homograph", _NA),
                "homograph_wordid": item.get("homograph_wordid", _NA),
                "homograph_char_start": item.get("homograph_char_start", 0),
                "homograph_char_end": item.get("homograph_char_end", 0),
                "homograph_phn_start": item.get("homograph_phn_start", 0),
                "homograph_phn_end": item.get("homograph_phn_end", 0),
            }
            yield sentence_counter, resp