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18b6a95 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | """
Utility for parsing chapter range expressions like "1-100", "1,5,9", "1-50,70-90".
"""
from __future__ import annotations
import re
def parse_chapter_range(expr: str, max_chapter: int = 99999) -> list[int]:
"""
Parse expressions like:
"" -> all chapters (empty list = no filter)
"1-100" -> 1 through 100
"50" -> chapter 50 only
"1,5,9,20" -> specific chapters
"1-50,70-90" -> ranges combined
Returns sorted list of chapter indices, or empty list meaning "all".
"""
expr = expr.strip()
if not expr or expr.lower() in ("all", "*"):
return []
indices: set[int] = set()
parts = re.split(r",\s*", expr)
for part in parts:
part = part.strip()
if not part:
continue
m = re.match(r"^(\d+)\s*-\s*(\d+)$", part)
if m:
start, end = int(m.group(1)), int(m.group(2))
indices.update(range(min(start, end), max(start, end) + 1))
elif re.match(r"^\d+$", part):
indices.add(int(part))
# ignore invalid parts
return sorted(indices)
def format_range_hint(total: int) -> str:
if total == 0:
return "No chapters found yet"
return f"e.g. all, 1-{total}, 1-50,70-90, 5,10,15"
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