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Edit File: uri_validate.py

"""
Regex for URIs

These regex are directly derived from the collected ABNF in RFC3986
(except for DIGIT, ALPHA and HEXDIG, defined by RFC2234).

They should be processed with re.VERBOSE.

Thanks Mark Nottingham for this code - https://gist.github.com/138549
"""
import re

# basics

DIGIT = r"[\x30-\x39]"

ALPHA = r"[\x41-\x5A\x61-\x7A]"

HEXDIG = r"[\x30-\x39A-Fa-f]"

#   pct-encoded   = "%" HEXDIG HEXDIG
pct_encoded = r" %% %(HEXDIG)s %(HEXDIG)s" % locals()

#   unreserved    = ALPHA / DIGIT / "-" / "." / "_" / "~"
unreserved = r"(?: %(ALPHA)s | %(DIGIT)s | \- | \. | _ | ~ )" % locals()

# gen-delims    = ":" / "/" / "?" / "#" / "[" / "]" / "@"
gen_delims = r"(?: : | / | \? | \# | \[ | \] | @ )"

#   sub-delims    = "!" / "$" / "&" / "'" / "(" / ")"
#                 / "*" / "+" / "," / ";" / "="
sub_delims = r"""(?: ! | \$ | & | ' | $ | $ |
                     \* | \+ | , | ; | = )"""

#   pchar         = unreserved / pct-encoded / sub-delims / ":" / "@"
pchar = r"(?: %(unreserved)s | %(pct_encoded)s | %(sub_delims)s | : | @ )" % locals(
)

#   reserved      = gen-delims / sub-delims
reserved = r"(?: %(gen_delims)s | %(sub_delims)s )" % locals()

# scheme

#   scheme        = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
scheme = r"%(ALPHA)s (?: %(ALPHA)s | %(DIGIT)s | \+ | \- | \. )*" % locals()

# authority

#   dec-octet     = DIGIT                 ; 0-9
#                 / %x31-39 DIGIT         ; 10-99
#                 / "1" 2DIGIT            ; 100-199
#                 / "2" %x30-34 DIGIT     ; 200-249
#                 / "25" %x30-35          ; 250-255
dec_octet = r"""(?: %(DIGIT)s |
                    [\x31-\x39] %(DIGIT)s |
                    1 %(DIGIT)s{2} |
                    2 [\x30-\x34] %(DIGIT)s |
                    25 [\x30-\x35]
                )
""" % locals()

#  IPv4address   = dec-octet "." dec-octet "." dec-octet "." dec-octet
IPv4address = r"%(dec_octet)s \. %(dec_octet)s \. %(dec_octet)s \. %(dec_octet)s" % locals(
)

#   IPv6address
IPv6address = r"([A-Fa-f0-9:]+[:$])[A-Fa-f0-9]{1,4}"

#   IPvFuture     = "v" 1*HEXDIG "." 1*( unreserved / sub-delims / ":" )
IPvFuture = r"v %(HEXDIG)s+ \. (?: %(unreserved)s | %(sub_delims)s | : )+" % locals()

#   IP-literal    = "[" ( IPv6address / IPvFuture  ) "]"
IP_literal = r"\[ (?: %(IPv6address)s | %(IPvFuture)s ) \]" % locals()

#   reg-name      = *( unreserved / pct-encoded / sub-delims )
reg_name = r"(?: %(unreserved)s | %(pct_encoded)s | %(sub_delims)s )*" % locals()

#   userinfo      = *( unreserved / pct-encoded / sub-delims / ":" )
userinfo = r"(?: %(unreserved)s | %(pct_encoded)s | %(sub_delims)s | : )" % locals(
)

#   host          = IP-literal / IPv4address / reg-name
host = r"(?: %(IP_literal)s | %(IPv4address)s | %(reg_name)s )" % locals()

#   port          = *DIGIT
port = r"(?: %(DIGIT)s )*" % locals()

#   authority     = [ userinfo "@" ] host [ ":" port ]
authority = r"(?: %(userinfo)s @)? %(host)s (?: : %(port)s)?" % locals()

# Path

#   segment       = *pchar
segment = r"%(pchar)s*" % locals()

#   segment-nz    = 1*pchar
segment_nz = r"%(pchar)s+" % locals()

#   segment-nz-nc = 1*( unreserved / pct-encoded / sub-delims / "@" )
#                 ; non-zero-length segment without any colon ":"
segment_nz_nc = r"(?: %(unreserved)s | %(pct_encoded)s | %(sub_delims)s | @ )+" % locals()

#   path-abempty  = *( "/" segment )
path_abempty = r"(?: / %(segment)s )*" % locals()

#   path-absolute = "/" [ segment-nz *( "/" segment ) ]
path_absolute = r"/ (?: %(segment_nz)s (?: / %(segment)s )* )?" % locals()

#   path-noscheme = segment-nz-nc *( "/" segment )
path_noscheme = r"%(segment_nz_nc)s (?: / %(segment)s )*" % locals()

#   path-rootless = segment-nz *( "/" segment )
path_rootless = r"%(segment_nz)s (?: / %(segment)s )*" % locals()

#   path-empty    = 0<pchar>
path_empty = r""  # FIXME

#   path          = path-abempty    ; begins with "/" or is empty
#                 / path-absolute   ; begins with "/" but not "//"
#                 / path-noscheme   ; begins with a non-colon segment
#                 / path-rootless   ; begins with a segment
#                 / path-empty      ; zero characters
path = r"""(?: %(path_abempty)s |
               %(path_absolute)s |
               %(path_noscheme)s |
               %(path_rootless)s |
               %(path_empty)s
            )
""" % locals()

### Query and Fragment

#   query         = *( pchar / "/" / "?" )
query = r"(?: %(pchar)s | / | \? )*" % locals()

#   fragment      = *( pchar / "/" / "?" )
fragment = r"(?: %(pchar)s | / | \? )*" % locals()

# URIs

#   hier-part     = "//" authority path-abempty
#                 / path-absolute
#                 / path-rootless
#                 / path-empty
hier_part = r"""(?: (?: // %(authority)s %(path_abempty)s ) |
                    %(path_absolute)s |
                    %(path_rootless)s |
                    %(path_empty)s
                )
""" % locals()

#   relative-part = "//" authority path-abempty
#                 / path-absolute
#                 / path-noscheme
#                 / path-empty
relative_part = r"""(?: (?: // %(authority)s %(path_abempty)s ) |
                        %(path_absolute)s |
                        %(path_noscheme)s |
                        %(path_empty)s
                    )
""" % locals()

# relative-ref  = relative-part [ "?" query ] [ "#" fragment ]
relative_ref = r"%(relative_part)s (?: \? %(query)s)? (?: \# %(fragment)s)?" % locals(
)

# URI           = scheme ":" hier-part [ "?" query ] [ "#" fragment ]
URI = r"^(?: %(scheme)s : %(hier_part)s (?: \? %(query)s )? (?: \# %(fragment)s )? )$" % locals(
)

#   URI-reference = URI / relative-ref
URI_reference = r"^(?: %(URI)s | %(relative_ref)s )$" % locals()

#   absolute-URI  = scheme ":" hier-part [ "?" query ]
absolute_URI = r"^(?: %(scheme)s : %(hier_part)s (?: \? %(query)s )? )$" % locals(
)

def is_uri(uri):
    return re.match(URI, uri, re.VERBOSE)

def is_uri_reference(uri):
    return re.match(URI_reference, uri, re.VERBOSE)

def is_absolute_uri(uri):
    return re.match(absolute_URI, uri, re.VERBOSE)