LBRACKET = L("[").suppress()
RBRACKET = L("]").suppress()
LPAREN = L("(").suppress()
RPAREN = L(")").suppress()
COMMA = L(",").suppress()
SEMICOLON = L(";").suppress()
AT = L("@").suppress()
PUNCTUATION = Word("-_.")
IDENTIFIER_END = ALPHANUM | (ZeroOrMore(PUNCTUATION) + ALPHANUM)
IDENTIFIER = Combine(ALPHANUM + ZeroOrMore(IDENTIFIER_END))
NAME = IDENTIFIER("name")
EXTRA = IDENTIFIER
URI = Regex(r"[^ ]+")("url")
URL = AT + URI
EXTRAS_LIST = EXTRA + ZeroOrMore(COMMA + EXTRA)
EXTRAS = (LBRACKET + Optional(EXTRAS_LIST) + RBRACKET)("extras")
VERSION_PEP440 = Regex(Specifier._regex_str, re.VERBOSE | re.IGNORECASE)
VERSION_LEGACY = Regex(LegacySpecifier._regex_str, re.VERBOSE | re.IGNORECASE)
VERSION_ONE = VERSION_PEP440 ^ VERSION_LEGACY
VERSION_MANY = Combine(VERSION_ONE + ZeroOrMore(COMMA + VERSION_ONE),
joinString=",",
adjacent=False)("_raw_spec")
_VERSION_SPEC = Optional(((LPAREN + VERSION_MANY + RPAREN) | VERSION_MANY))
_VERSION_SPEC.setParseAction(lambda s, l, t: t._raw_spec or "")
ALPHANUM = Word(string.ascii_letters + string.digits)
LBRACKET = L('[').suppress()
RBRACKET = L(']').suppress()
LPAREN = L('(').suppress()
RPAREN = L(')').suppress()
COMMA = L(',').suppress()
SEMICOLON = L(';').suppress()
AT = L('@').suppress()
PUNCTUATION = Word('-_.')
IDENTIFIER_END = ALPHANUM | ZeroOrMore(PUNCTUATION) + ALPHANUM
IDENTIFIER = Combine(ALPHANUM + ZeroOrMore(IDENTIFIER_END))
NAME = IDENTIFIER('name')
EXTRA = IDENTIFIER
URI = Regex('[^ ]+')('url')
URL = AT + URI
EXTRAS_LIST = EXTRA + ZeroOrMore(COMMA + EXTRA)
EXTRAS = (LBRACKET + Optional(EXTRAS_LIST) + RBRACKET)('extras')
VERSION_PEP440 = Regex(Specifier._regex_str, re.VERBOSE | re.IGNORECASE)
VERSION_LEGACY = Regex(LegacySpecifier._regex_str, re.VERBOSE | re.IGNORECASE)
VERSION_ONE = VERSION_PEP440 ^ VERSION_LEGACY
VERSION_MANY = Combine(VERSION_ONE + ZeroOrMore(COMMA + VERSION_ONE), joinString=',', adjacent=False)('_raw_spec')
_VERSION_SPEC = Optional(LPAREN + VERSION_MANY + RPAREN | VERSION_MANY)
_VERSION_SPEC.setParseAction(lambda s, l, t: t._raw_spec or '')
VERSION_SPEC = originalTextFor(_VERSION_SPEC)('specifier')
VERSION_SPEC.setParseAction(lambda s, l, t: t[1])
MARKER_EXPR = originalTextFor(MARKER_EXPR())('marker')
MARKER_EXPR.setParseAction(lambda s, l, t: Marker(s[t._original_start:t._original_end]))
MARKER_SEPERATOR = SEMICOLON
MARKER = MARKER_SEPERATOR + MARKER_EXPR
