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parse.py
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parse.py
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import re
from typing import Dict, List, Set, Union
from .canon import book_id_to_number, book_number_to_id
from .constants import ORIGINAL_VERSIFICATION
from .verse_ref import Versification
COMMA_SEPARATED_BOOKS = re.compile(r"([A-Z\d]{3}|OT|NT)(, ?([A-Z\d]{3}|OT|NT))*")
BOOK_RANGE = re.compile(r"-?[A-Z\d]{3}-[A-Z\d]{3}")
CHAPTER_SELECTION = re.compile(r"-?[A-Z\d]{3} ?(\d+|\d+-\d+)(, ?(\d+|\d+-\d+))*")
def get_books(books: Union[str, List[str]]) -> Set[int]:
if isinstance(books, str):
books = re.split(",|;", books)
book_set: Set[int] = set()
for book_id in books:
book_id = book_id.strip().strip("*").upper()
subtraction = False
if book_id.startswith("-"):
subtraction = True
book_id = book_id[1:]
if book_id == "NT":
book_set = update_selection(book_set, set(range(40, 67)), subtraction)
elif book_id == "OT":
book_set = update_selection(book_set, set(range(1, 40)), subtraction)
elif "-" in book_id:
ends = book_id.split("-")
if len(ends) != 2 or book_id_to_number(ends[0]) == 0 or book_id_to_number(ends[1]) == 0:
raise ValueError(f"{book_id} is an invalid book range.")
if book_id_to_number(ends[0]) >= book_id_to_number(ends[1]):
raise ValueError(f"{book_id} is an invalid book range. {ends[1]} precedes {ends[0]}.")
book_set = update_selection(
book_set, set(range(book_id_to_number(ends[0]), book_id_to_number(ends[1]) + 1)), subtraction
)
else:
book_num = book_id_to_number(book_id)
if book_num == 0:
raise ValueError(f"{book_id} is an invalid book ID.")
book_set = update_selection(book_set, {book_num}, subtraction)
return book_set
def update_selection(book_set: Set[int], book_nums: Set[int], subtraction: bool) -> Set[int]:
if subtraction:
if book_nums.issubset(book_set):
book_set.difference_update(book_nums)
else:
book_ids = set()
for book_num in book_nums:
book_ids.add(book_number_to_id(book_num))
raise ValueError(f"{book_ids} cannot be removed as it is not in the existing book selection.")
else:
book_set.update(book_nums)
return book_set
def parse_selection(selection: str, versification: Versification) -> Dict[int, List[int]]:
selection = selection.strip()
chapters = {}
if selection[-1].isdigit() and len(selection) > 3: # Specific chapters from one book
book = book_id_to_number(selection[:3])
if book == 0:
raise ValueError(f"{selection[:3]} is an invalid book ID.")
book_chapters = set()
last_chapter = versification.get_last_chapter(book)
chapter_nums = selection[3:].split(",")
for chapter_num in chapter_nums:
chapter_num = chapter_num.strip()
if "-" in chapter_num:
start, end = chapter_num.split("-")
if int(start) == 0 or int(end) > last_chapter or int(end) <= int(start):
raise ValueError(f"{chapter_num} is an invalid chapter range.")
for i in range(int(start), int(end) + 1):
book_chapters.add(i)
else:
if int(chapter_num) == 0 or int(chapter_num) > last_chapter:
raise ValueError(f"{chapter_num} is an invalid chapter number.")
book_chapters.add(int(chapter_num))
if len(book_chapters) == last_chapter:
chapters[book] = []
else:
chapters[book] = sorted(list(book_chapters))
elif "-" in selection: # Span of books
ends = selection.split("-")
if len(ends) != 2 or book_id_to_number(ends[0]) == 0 or book_id_to_number(ends[1]) == 0:
raise ValueError(f"{selection} is an invalid book range.")
if book_id_to_number(ends[0]) >= book_id_to_number(ends[1]):
raise ValueError(f"{selection} is an invalid book range. {ends[1]} precedes {ends[0]}.")
for i in range(book_id_to_number(ends[0]), book_id_to_number(ends[1]) + 1):
chapters[i] = []
elif selection == "OT":
for i in range(1, 40):
chapters[i] = []
elif selection == "NT":
for i in range(40, 67):
chapters[i] = []
else: # Single whole book
book = book_id_to_number(selection)
if book == 0:
raise ValueError(f"{selection} is an invalid book ID.")
chapters[book] = []
return chapters
# Output format: { book_num: [chapters] }
# An empty list, i.e. book_num: [] signifies the inclusion of all chapters
def get_chapters(
selections: Union[str, List[str]], versification: Versification = ORIGINAL_VERSIFICATION
) -> Dict[int, List[int]]:
chapters = {}
if isinstance(selections, str):
selections = selections.strip()
if len(selections) == 0:
return chapters
delimiter = ";"
if ";" in selections:
delimiter = ";"
elif re.fullmatch(COMMA_SEPARATED_BOOKS, selections) is not None:
delimiter = ","
elif re.fullmatch(BOOK_RANGE, selections) is None and re.fullmatch(CHAPTER_SELECTION, selections) is None:
raise ValueError(
"Invalid syntax. If you are providing multiple selections, e.g. a range of books followed by a"
"selection of chapters from a book, separate each selection with a semicolon."
)
selections = selections.split(delimiter)
for selection in selections:
selection = selection.strip()
if selection.startswith("-"): # Subtraction
selection_chapters = parse_selection(selection[1:], versification)
for book in selection_chapters:
if book not in chapters:
raise ValueError(
f"{book_number_to_id(book)} cannot be removed as it is not in the existing book selection."
)
if selection_chapters[book] == []:
selection_chapters[book] = [i + 1 for i in range(versification.get_last_chapter(book))]
if chapters[book] == []:
chapters[book] = [i + 1 for i in range(versification.get_last_chapter(book))]
for chapter in selection_chapters[book]:
try:
chapters[book].remove(chapter)
except ValueError:
raise ValueError(
f"{book_number_to_id(book)} {chapter} cannot be removed as it is not in the existing"
"chapter selection."
)
if len(chapters[book]) == 0:
del chapters[book]
else:
selection_chapters = parse_selection(selection, versification)
for book in selection_chapters:
if book in chapters:
if chapters[book] == [] or selection_chapters[book] == []:
chapters[book] = []
continue
chapters[book] = list(set(chapters[book] + selection_chapters[book]))
if len(chapters[book]) == versification.get_last_chapter(book):
chapters[book] = []
else:
chapters[book] = selection_chapters[book]
return chapters