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"""
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ExcelSpreadsheetToDict
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Created by:
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Emanuel Borges
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09.09.2025
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A library for manipulating Excel Spreadsheets. Created to compare privilege logs.
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"""
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from typing import Dict, Iterable, Optional, Tuple
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from collections import namedtuple
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from win32com import client as win32
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version = "1.0"
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class ExcelToDictIngestor:
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def __init__(self):
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self._excel_app = None ## Will be ceated on demand
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@staticmethod
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def _normalize_col_letter(col: str) -> str:
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if not isinstance(col, str) or not col.isalpha():
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raise ValueError(f"Invalid Excel column letter: {col!r}")
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return col.upper()
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@staticmethod
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def _cel_to_string(val) -> str:
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if val is None:
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return ""
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return str(val)
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@staticmethod
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def _normalize_single(val) -> str:
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return ExcelToDictIngestor._cel_to_string(val).strip().upper()
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@staticmethod
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def _normalize_multi(val,delimiter: str) -> list:
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raw = ExcelToDictIngestor._cel_to_string(val)
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parts = [p.strip().upper() for p in raw.split(delimiter)]
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uniq = sorted({p for p in parts if p})
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return uniq
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def _ensure_app(self, visible: bool):
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if self._excel_app is None:
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self._excel_app = win32.Dispatch("Excel.Application")
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self._excel_app.Visible = bool(visible)
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def _close_app(self):
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if self._excel_app is not None:
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try:
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self._excel_app.Quit()
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finally:
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self._excel_app = None
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def load(self, filepath: str, doc_id_col: str, columns: Iterable[Tuple[str, bool]], start_row: int = 2, end_row: Optional[int] = None, sheet_name: Optional[str] = None, delimiter: str = ";", visible: bool = False,) -> Dict[str, tuple]:
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doc_id_col = self._normalize_col_letter(doc_id_col)
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col_specs = [(self._normalize_col_letter(c), bool(is_multi)) for c, is_multi in columns]
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field_names = [c for c, _ in col_specs]
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RowTuple = namedtuple("Row", field_names)
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data: Dict[str, RowTuple] = {}
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self._ensure_app(visible=visible)
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wb = None
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try:
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wb = self._excel_app.Workbooks.Open(filepath)
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ws = wb.Worksheets(sheet_name) if sheet_name else wb.ActiveSheet
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if end_row is None:
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used = ws.UsedRange
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end_row = used.Row + used.Rows.Count -1
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for row in range(start_row, end_row +1):
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doc_id_val = ws.Range(f"{doc_id_col}{row}").Value
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doc_id = self._normalize_single(doc_id_val)
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if not doc_id:
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continue
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row_values = []
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for col_letter, is_multi in col_specs:
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cell_val = ws.Range(f"{col_letter}{row}").Value
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if is_multi:
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row_values.append(self._normalize_multi(cell_val, delimiter))
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else:
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row_values.append(self._normalize_single(cell_val))
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data[doc_id] = RowTuple(*row_values)
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wb.Close(SaveChanges = False)
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wb = None
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finally:
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if wb is not None:
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try:
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wb.Close(SaveChanges = False)
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except Exception:
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pass
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if not visible:
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self._close_app()
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return data |
