Initial.

.gitignore

+*.pyc
+build/
+rfc6266.egg-info/

rfc6266.py

+"""
+"""
+
+from lepl import *
+from collections import namedtuple
+from urllib import unquote
+from string import hexdigits
+import re
+
+__all__ = ('parse_header', )
+
+
+separator_chars = "()<>@,;:\\\"/[]?={} \t"
+non_attr_chars = separator_chars + "*'%"
+
+LangTagged = namedtuple('LangTagged', 'string langtag')
+
+
+def parse_ext_value(val):
+    charset = val[0]
+    if len(val) == 3:
+        charset, langtag, coded = val
+    else:
+        charset, coded = val
+        langtag = None
+    decoded = coded.decode(charset)
+    return LangTagged(decoded, langtag)
+
+
+
+# Currently LEPL doesn't handle case-insensivitity:
+# https://groups.google.com/group/lepl/browse_thread/thread/68e7b136038772ca
+def case_insensitive_literal(lit):
+    return Regexp('(?i)' + re.escape(lit))
+
+
+if True:
+#with TraceVariables():
+    # Definitions from https://tools.ietf.org/html/rfc2616#section-2.2
+    separator = Any(separator_chars)
+    token = AnyBut(separator_chars)[1:, ...]
+    qdtext = AnyBut('"')
+    #char = Any(''.join(chr(i) for i in xrange(128)))  # ascii range: 0-127
+    char = Any()  # we check for ascii before calling the parser
+    quoted_pair = Drop('\\') + char
+    quoted_string = Drop('"') & (quoted_pair | qdtext)[:, ...] & Drop('"')
+
+    value = token | quoted_string
+
+    # Other charsets are forbidden, the spec reserves them
+    # for future evolutions.
+    charset = case_insensitive_literal('UTF-8') | case_insensitive_literal('ISO-8859-1')
+    # XXX See RFC 5646 for the correct definition
+    language = token
+    attr_char = AnyBut(non_attr_chars)
+    hexdig = Any(hexdigits)
+    pct_encoded = '%' + hexdig + hexdig >> unquote
+    value_chars = (pct_encoded | attr_char)[...]
+    ext_value = charset & Drop("'") & Optional(language) & Drop("'") & value_chars > parse_ext_value
+    ext_token = token + '*'
+    noext_token = ~Lookahead(ext_token) & token
+
+    # Adapted/simplified from https://tools.ietf.org/html/rfc6266
+    with DroppedSpace():
+        disposition_parm = (ext_token & '=' & ext_value ) | (noext_token & '=' & value)
+        disposition_type = Literal('inline') | Literal('attachment') | token
+        content_disposition_value = disposition_type & Star(';' & disposition_parm)
+
+
+
+class ContentDisposition(object):
+    # inline indicates default processing
+    disposition = 'inline'
+    filename = None
+    extra_parms = None
+
+
+def parse_header(hdrval):
+    # Require hdrval to be ascii bytes (0-127),
+    # or characters in the ascii range
+    hdrval = hdrval.encode('ascii')
+    #content_disposition_value.config.clear().record_deepest()
+
+    return content_disposition_value.parse(hdrval)
+
+
+def selftest():
+    sys.stderr.write('%s\n' % disposition_parm.parse('a=b'))
+    sys.stderr.write('%s\n' % parse_header('attachment'))
+    sys.stderr.write('%s\n' % parse_header('attachment; a=b'))
+    sys.stderr.write('%s\n' % parse_header('attachment; filename=simple'))
+    sys.stderr.write('%s\n' % parse_header('attachment; filename="EURO rates"; filename*=utf-8\'\'%e2%82%ac%20rates'))
+
+
+if __name__ == '__main__':
+    import sys
+    sys.exit(selftest())
+

setup.py

+
+from distutils.core import setup
+
+setup(
+    name='rfc6266',
+    version='0.0.1',  # symver
+    py_modules=['rfc6266'],
+)
+