_I='error'
_H='original'
_G='value'
_F='key'
_E='Binding'
_D='line'
_C='string'
_B='Original'
_A=None
import codecs,re
from .compat import IS_TYPE_CHECKING,to_text
if IS_TYPE_CHECKING:from typing import IO,Iterator,Match,NamedTuple,Optional,Pattern,Sequence,Text,Tuple
def make_regex(string,extra_flags=0):return re.compile(to_text(string),re.UNICODE|extra_flags)
_newline=make_regex('(\\r\\n|\\n|\\r)')
_multiline_whitespace=make_regex('\\s*',extra_flags=re.MULTILINE)
_whitespace=make_regex('[^\\S\\r\\n]*')
_export=make_regex('(?:export[^\\S\\r\\n]+)?')
_single_quoted_key=make_regex("'([^']+)'")
_unquoted_key=make_regex('([^=\\#\\s]+)')
_equal_sign=make_regex('(=[^\\S\\r\\n]*)')
_single_quoted_value=make_regex("'((?:\\\\'|[^'])*)'")
_double_quoted_value=make_regex('"((?:\\\\"|[^"])*)"')
_unquoted_value_part=make_regex('([^ \\r\\n]*)')
_comment=make_regex('(?:[^\\S\\r\\n]*#[^\\r\\n]*)?')
_end_of_line=make_regex('[^\\S\\r\\n]*(?:\\r\\n|\\n|\\r|$)')
_rest_of_line=make_regex('[^\\r\\n]*(?:\\r|\\n|\\r\\n)?')
_double_quote_escapes=make_regex('\\\\[\\\\\'\\"abfnrtv]')
_single_quote_escapes=make_regex("\\\\[\\\\']")
try:import typing;Original=typing.NamedTuple(_B,[(_C,typing.Text),(_D,int)]);Binding=typing.NamedTuple(_E,[(_F,typing.Optional[typing.Text]),(_G,typing.Optional[typing.Text]),(_H,Original),(_I,bool)])
except ImportError:from collections import namedtuple;Original=namedtuple(_B,[_C,_D]);Binding=namedtuple(_E,[_F,_G,_H,_I])
class Position:
	def __init__(A,chars,line):A.chars=chars;A.line=line
	@classmethod
	def start(A):return A(chars=0,line=1)
	def set(A,other):B=other;A.chars=B.chars;A.line=B.line
	def advance(A,string):B=string;A.chars+=len(B);A.line+=len(re.findall(_newline,B))
class Error(Exception):0
class Reader:
	def __init__(A,stream):A.string=stream.read();A.position=Position.start();A.mark=Position.start()
	def has_next(A):return A.position.chars<len(A.string)
	def set_mark(A):A.mark.set(A.position)
	def get_marked(A):return Original(string=A.string[A.mark.chars:A.position.chars],line=A.mark.line)
	def peek(A,count):return A.string[A.position.chars:A.position.chars+count]
	def read(A,count):
		C=count;B=A.string[A.position.chars:A.position.chars+C]
		if len(B)<C:raise Error('read: End of string')
		A.position.advance(B);return B
	def read_regex(A,regex):
		B=regex.match(A.string,A.position.chars)
		if B is _A:raise Error('read_regex: Pattern not found')
		A.position.advance(A.string[B.start():B.end()]);return B.groups()
def decode_escapes(regex,string):
	def A(match):return codecs.decode(match.group(0),'unicode-escape')
	return regex.sub(A,string)
def parse_key(reader):
	A=reader;B=A.peek(1)
	if B=='#':return _A
	elif B=="'":C,=A.read_regex(_single_quoted_key)
	else:C,=A.read_regex(_unquoted_key)
	return C
def parse_unquoted_value(reader):
	A=reader;B=''
	while True:
		D,=A.read_regex(_unquoted_value_part);B+=D;C=A.peek(2)
		if len(C)<2 or C[0]in'\r\n'or C[1]in' #\r\n':return B
		B+=A.read(2)
def parse_value(reader):
	A=reader;B=A.peek(1)
	if B=="'":C,=A.read_regex(_single_quoted_value);return decode_escapes(_single_quote_escapes,C)
	elif B=='"':C,=A.read_regex(_double_quoted_value);return decode_escapes(_double_quote_escapes,C)
	elif B in('','\n','\r'):return''
	else:return parse_unquoted_value(A)
def parse_binding(reader):
	D=False;A=reader;A.set_mark()
	try:
		A.read_regex(_multiline_whitespace)
		if not A.has_next():return Binding(key=_A,value=_A,original=A.get_marked(),error=D)
		A.read_regex(_export);C=parse_key(A);A.read_regex(_whitespace)
		if A.peek(1)=='=':A.read_regex(_equal_sign);B=parse_value(A)
		else:B=_A
		A.read_regex(_comment);A.read_regex(_end_of_line);return Binding(key=C,value=B,original=A.get_marked(),error=D)
	except Error:A.read_regex(_rest_of_line);return Binding(key=_A,value=_A,original=A.get_marked(),error=True)
def parse_stream(stream):
	A=Reader(stream)
	while A.has_next():yield parse_binding(A)