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116 lines
3.4 KiB
Python
116 lines
3.4 KiB
Python
"""Tabular parser.
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Contains parsers for tabular data files.
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"""
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from pathlib import Path
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from typing import Any, Dict, List, Union
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from application.parser.file.base_parser import BaseParser
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class CSVParser(BaseParser):
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"""CSV parser.
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Args:
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concat_rows (bool): whether to concatenate all rows into one document.
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If set to False, a Document will be created for each row.
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True by default.
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"""
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def __init__(self, *args: Any, concat_rows: bool = True, **kwargs: Any) -> None:
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"""Init params."""
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super().__init__(*args, **kwargs)
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self._concat_rows = concat_rows
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def _init_parser(self) -> Dict:
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"""Init parser."""
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return {}
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def parse_file(self, file: Path, errors: str = "ignore") -> Union[str, List[str]]:
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"""Parse file.
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Returns:
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Union[str, List[str]]: a string or a List of strings.
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"""
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try:
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import csv
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except ImportError:
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raise ValueError("csv module is required to read CSV files.")
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text_list = []
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with open(file, "r") as fp:
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csv_reader = csv.reader(fp)
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for row in csv_reader:
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text_list.append(", ".join(row))
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if self._concat_rows:
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return "\n".join(text_list)
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else:
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return text_list
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class PandasCSVParser(BaseParser):
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r"""Pandas-based CSV parser.
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Parses CSVs using the separator detection from Pandas `read_csv`function.
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If special parameters are required, use the `pandas_config` dict.
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Args:
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concat_rows (bool): whether to concatenate all rows into one document.
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If set to False, a Document will be created for each row.
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True by default.
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col_joiner (str): Separator to use for joining cols per row.
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Set to ", " by default.
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row_joiner (str): Separator to use for joining each row.
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Only used when `concat_rows=True`.
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Set to "\n" by default.
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pandas_config (dict): Options for the `pandas.read_csv` function call.
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Refer to https://pandas.pydata.org/docs/reference/api/pandas.read_csv.html
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for more information.
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Set to empty dict by default, this means pandas will try to figure
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out the separators, table head, etc. on its own.
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"""
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def __init__(
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self,
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*args: Any,
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concat_rows: bool = True,
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col_joiner: str = ", ",
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row_joiner: str = "\n",
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pandas_config: dict = {},
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**kwargs: Any
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) -> None:
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"""Init params."""
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super().__init__(*args, **kwargs)
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self._concat_rows = concat_rows
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self._col_joiner = col_joiner
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self._row_joiner = row_joiner
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self._pandas_config = pandas_config
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def _init_parser(self) -> Dict:
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"""Init parser."""
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return {}
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def parse_file(self, file: Path, errors: str = "ignore") -> Union[str, List[str]]:
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"""Parse file."""
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try:
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import pandas as pd
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except ImportError:
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raise ValueError("pandas module is required to read CSV files.")
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df = pd.read_csv(file, **self._pandas_config)
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text_list = df.apply(
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lambda row: (self._col_joiner).join(row.astype(str).tolist()), axis=1
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).tolist()
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if self._concat_rows:
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return (self._row_joiner).join(text_list)
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else:
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return text_list
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