/usr/lib/python3/dist-packages/zope/contenttype/parse.py is in python3-zope.contenttype 4.1.0-1.
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#
# Copyright (c) 2001, 2002 Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
"""MIME Content-Type parsing helper functions.
This supports parsing RFC 1341 Content-Type values, including
quoted-string values as defined in RFC 822.
"""
__docformat__ = "reStructuredText"
import re
# TODO: This still needs to support comments in structured fields as
# specified in RFC 2822.
def parse(string):
major, minor, params = parseOrdered(string)
d = {}
for (name, value) in params:
d[name] = value
return major, minor, d
def parseOrdered(string):
if ";" in string:
type, params = string.split(";", 1)
params = _parse_params(params)
else:
type = string
params = []
if "/" not in type:
raise ValueError("content type missing major/minor parts: %r" % type)
type = type.strip()
major, minor = type.lower().split("/", 1)
return _check_token(major.strip()), _check_token(minor.strip()), params
def _parse_params(string):
result = []
string = string.strip()
while string:
if not "=" in string:
raise ValueError("parameter values are not optional")
name, rest = string.split("=", 1)
name = _check_token(name.strip().lower())
rest = rest.strip()
# rest is: value *[";" parameter]
if rest[:1] == '"':
# quoted-string, defined in RFC 822.
m = _quoted_string_match(rest)
if m is None:
raise ValueError("invalid quoted-string in %r" % rest)
value = m.group()
rest = rest[m.end():].strip()
#import pdb; pdb.set_trace()
if rest[:1] not in ("", ";"):
raise ValueError(
"invalid token following quoted-string: %r" % rest)
rest = rest[1:]
value = _unescape(value)
elif ";" in rest:
value, rest = rest.split(";")
value = _check_token(value.strip())
else:
value = _check_token(rest.strip())
rest = ""
result.append((name, value))
string = rest.strip()
return result
def _quoted_string_match(string):
# This support RFC 822 quoted-string values.
global _quoted_string_match
_quoted_string_match = re.compile(
'"(?:\\\\.|[^"\n\r\\\\])*"', re.DOTALL).match
return _quoted_string_match(string)
def _check_token(string):
if _token_match(string) is None:
raise ValueError('"%s" is not a valid token' % string)
return string
def _token_match(string):
global _token_match
_token_match = re.compile("[^][ \t\n\r()<>@,;:\"/?=\\\\]+$").match
return _token_match(string)
def _unescape(string):
assert string[0] == '"'
assert string[-1] == '"'
string = string[1:-1]
if "\\" in string:
string = re.sub(r"\\(.)", r"\1", string)
return string
def join(spec):
(major, minor, params) = spec
pstr = ""
try:
params.items
except AttributeError:
pass
else:
params = params.items()
# ensure a predictable order:
params = sorted(params)
for name, value in params:
pstr += ";%s=%s" % (name, _escape(value))
return "%s/%s%s" % (major, minor, pstr)
def _escape(string):
try:
return _check_token(string)
except ValueError:
# '\\' must be first
for c in '\\"\n\r':
string = string.replace(c, "\\" + c)
return '"%s"' % string
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