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"""Normalize input string."""
import re
from .state_core import StateCore
# https://spec.commonmark.org/0.29/#line-ending
NEWLINES_RE = re.compile(r"\r\n?|\n")
NULL_RE = re.compile(r"\0")
def normalize(state: StateCore) -> None:
# Normalize newlines
string = NEWLINES_RE.sub("\n", state.src)
# Replace NULL characters
string = NULL_RE.sub("\uFFFD", string)
state.src = string