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191 lines
6.0 KiB
191 lines
6.0 KiB
"""
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Regex for URIs
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These regex are directly derived from the collected ABNF in RFC3986
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(except for DIGIT, ALPHA and HEXDIG, defined by RFC2234).
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They should be processed with re.VERBOSE.
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Thanks Mark Nottingham for this code - https://gist.github.com/138549
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"""
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import re
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# basics
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DIGIT = r"[\x30-\x39]"
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ALPHA = r"[\x41-\x5A\x61-\x7A]"
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HEXDIG = r"[\x30-\x39A-Fa-f]"
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# pct-encoded = "%" HEXDIG HEXDIG
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pct_encoded = r" %% %(HEXDIG)s %(HEXDIG)s" % locals()
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# unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~"
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unreserved = r"(?: %(ALPHA)s | %(DIGIT)s | \- | \. | _ | ~ )" % locals()
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# gen-delims = ":" / "/" / "?" / "#" / "[" / "]" / "@"
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gen_delims = r"(?: : | / | \? | \# | \[ | \] | @ )"
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# sub-delims = "!" / "$" / "&" / "'" / "(" / ")"
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# / "*" / "+" / "," / ";" / "="
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sub_delims = r"""(?: ! | \$ | & | ' | \( | \) |
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\* | \+ | , | ; | = )"""
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# pchar = unreserved / pct-encoded / sub-delims / ":" / "@"
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pchar = r"(?: %(unreserved)s | %(pct_encoded)s | %(sub_delims)s | : | @ )" % locals(
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)
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# reserved = gen-delims / sub-delims
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reserved = r"(?: %(gen_delims)s | %(sub_delims)s )" % locals()
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# scheme
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# scheme = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
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scheme = r"%(ALPHA)s (?: %(ALPHA)s | %(DIGIT)s | \+ | \- | \. )*" % locals()
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# authority
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# dec-octet = DIGIT ; 0-9
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# / %x31-39 DIGIT ; 10-99
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# / "1" 2DIGIT ; 100-199
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# / "2" %x30-34 DIGIT ; 200-249
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# / "25" %x30-35 ; 250-255
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dec_octet = r"""(?: %(DIGIT)s |
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[\x31-\x39] %(DIGIT)s |
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1 %(DIGIT)s{2} |
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2 [\x30-\x34] %(DIGIT)s |
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25 [\x30-\x35]
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)
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""" % locals()
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# IPv4address = dec-octet "." dec-octet "." dec-octet "." dec-octet
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IPv4address = r"%(dec_octet)s \. %(dec_octet)s \. %(dec_octet)s \. %(dec_octet)s" % locals(
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)
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# IPv6address
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IPv6address = r"([A-Fa-f0-9:]+:+)+[A-Fa-f0-9]+"
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# IPvFuture = "v" 1*HEXDIG "." 1*( unreserved / sub-delims / ":" )
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IPvFuture = r"v %(HEXDIG)s+ \. (?: %(unreserved)s | %(sub_delims)s | : )+" % locals()
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# IP-literal = "[" ( IPv6address / IPvFuture ) "]"
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IP_literal = r"\[ (?: %(IPv6address)s | %(IPvFuture)s ) \]" % locals()
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# reg-name = *( unreserved / pct-encoded / sub-delims )
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reg_name = r"(?: %(unreserved)s | %(pct_encoded)s | %(sub_delims)s )*" % locals()
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# userinfo = *( unreserved / pct-encoded / sub-delims / ":" )
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userinfo = r"(?: %(unreserved)s | %(pct_encoded)s | %(sub_delims)s | : )" % locals(
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)
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# host = IP-literal / IPv4address / reg-name
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host = r"(?: %(IP_literal)s | %(IPv4address)s | %(reg_name)s )" % locals()
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# port = *DIGIT
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port = r"(?: %(DIGIT)s )*" % locals()
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# authority = [ userinfo "@" ] host [ ":" port ]
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authority = r"(?: %(userinfo)s @)? %(host)s (?: : %(port)s)?" % locals()
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# Path
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# segment = *pchar
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segment = r"%(pchar)s*" % locals()
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# segment-nz = 1*pchar
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segment_nz = r"%(pchar)s+" % locals()
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# segment-nz-nc = 1*( unreserved / pct-encoded / sub-delims / "@" )
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# ; non-zero-length segment without any colon ":"
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segment_nz_nc = r"(?: %(unreserved)s | %(pct_encoded)s | %(sub_delims)s | @ )+" % locals()
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# path-abempty = *( "/" segment )
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path_abempty = r"(?: / %(segment)s )*" % locals()
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# path-absolute = "/" [ segment-nz *( "/" segment ) ]
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path_absolute = r"/ (?: %(segment_nz)s (?: / %(segment)s )* )?" % locals()
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# path-noscheme = segment-nz-nc *( "/" segment )
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path_noscheme = r"%(segment_nz_nc)s (?: / %(segment)s )*" % locals()
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# path-rootless = segment-nz *( "/" segment )
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path_rootless = r"%(segment_nz)s (?: / %(segment)s )*" % locals()
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# path-empty = 0<pchar>
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path_empty = r"" # FIXME
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# path = path-abempty ; begins with "/" or is empty
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# / path-absolute ; begins with "/" but not "//"
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# / path-noscheme ; begins with a non-colon segment
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# / path-rootless ; begins with a segment
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# / path-empty ; zero characters
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path = r"""(?: %(path_abempty)s |
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%(path_absolute)s |
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%(path_noscheme)s |
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%(path_rootless)s |
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%(path_empty)s
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)
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""" % locals()
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### Query and Fragment
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# query = *( pchar / "/" / "?" )
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query = r"(?: %(pchar)s | / | \? )*" % locals()
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# fragment = *( pchar / "/" / "?" )
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fragment = r"(?: %(pchar)s | / | \? )*" % locals()
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# URIs
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# hier-part = "//" authority path-abempty
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# / path-absolute
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# / path-rootless
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# / path-empty
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hier_part = r"""(?: (?: // %(authority)s %(path_abempty)s ) |
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%(path_absolute)s |
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%(path_rootless)s |
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%(path_empty)s
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)
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""" % locals()
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# relative-part = "//" authority path-abempty
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# / path-absolute
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# / path-noscheme
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# / path-empty
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relative_part = r"""(?: (?: // %(authority)s %(path_abempty)s ) |
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%(path_absolute)s |
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%(path_noscheme)s |
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%(path_empty)s
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)
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""" % locals()
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# relative-ref = relative-part [ "?" query ] [ "#" fragment ]
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relative_ref = r"%(relative_part)s (?: \? %(query)s)? (?: \# %(fragment)s)?" % locals(
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)
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# URI = scheme ":" hier-part [ "?" query ] [ "#" fragment ]
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URI = r"^(?: %(scheme)s : %(hier_part)s (?: \? %(query)s )? (?: \# %(fragment)s )? )$" % locals(
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)
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# URI-reference = URI / relative-ref
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URI_reference = r"^(?: %(URI)s | %(relative_ref)s )$" % locals()
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# absolute-URI = scheme ":" hier-part [ "?" query ]
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absolute_URI = r"^(?: %(scheme)s : %(hier_part)s (?: \? %(query)s )? )$" % locals(
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)
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def is_uri(uri):
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return re.match(URI, uri, re.VERBOSE)
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def is_uri_reference(uri):
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return re.match(URI_reference, uri, re.VERBOSE)
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def is_absolute_uri(uri):
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return re.match(absolute_URI, uri, re.VERBOSE)
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