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Edit File : common.rb \| Size : 17.16 KB
# = uri/common.rb # # Author:: Akira Yamada <akira@ruby-lang.org> # Revision:: $Id: common.rb 14178 2007-12-10 09:31:55Z matz $ # License:: # You can redistribute it and/or modify it under the same term as Ruby. # module URI module REGEXP # # Patterns used to parse URI's # module PATTERN # :stopdoc: # RFC 2396 (URI Generic Syntax) # RFC 2732 (IPv6 Literal Addresses in URL's) # RFC 2373 (IPv6 Addressing Architecture) # alpha = lowalpha \| upalpha ALPHA = "a-zA-Z" # alphanum = alpha \| digit ALNUM = "#{ALPHA}\\d" # hex = digit \| "A" \| "B" \| "C" \| "D" \| "E" \| "F" \| # "a" \| "b" \| "c" \| "d" \| "e" \| "f" HEX = "a-fA-F\\d" # escaped = "%" hex hex ESCAPED = "%[#{HEX}]{2}" # mark = "-" \| "_" \| "." \| "!" \| "~" \| "" \| "'" \| # "(" \| ")" # unreserved = alphanum \| mark UNRESERVED = "-_.!~'()#{ALNUM}" # reserved = ";" \| "/" \| "?" \| ":" \| "@" \| "&" \| "=" \| "+" \| # "$" \| "," # reserved = ";" \| "/" \| "?" \| ":" \| "@" \| "&" \| "=" \| "+" \| # "$" \| "," \| "[" \| "]" (RFC 2732) RESERVED = ";/?:@&=+$,\\[\\]" # uric = reserved \| unreserved \| escaped URIC = "(?:[#{UNRESERVED}#{RESERVED}]\|#{ESCAPED})" # uric_no_slash = unreserved \| escaped \| ";" \| "?" \| ":" \| "@" \| # "&" \| "=" \| "+" \| "$" \| "," URIC_NO_SLASH = "(?:[#{UNRESERVED};?:@&=+$,]\|#{ESCAPED})" # query = uric QUERY = "#{URIC}" # fragment = uric FRAGMENT = "#{URIC}" # domainlabel = alphanum \| alphanum ( alphanum \| "-" ) alphanum DOMLABEL = "(?:[#{ALNUM}](?:[-#{ALNUM}][#{ALNUM}])?)" # toplabel = alpha \| alpha ( alphanum \| "-" ) alphanum TOPLABEL = "(?:[#{ALPHA}](?:[-#{ALNUM}][#{ALNUM}])?)" # hostname = ( domainlabel "." ) toplabel [ "." ] HOSTNAME = "(?:#{DOMLABEL}\\.)#{TOPLABEL}\\.?" # RFC 2373, APPENDIX B: # IPv6address = hexpart [ ":" IPv4address ] # IPv4address = 13DIGIT "." 13DIGIT "." 13DIGIT "." 13DIGIT # hexpart = hexseq \| hexseq "::" [ hexseq ] \| "::" [ hexseq ] # hexseq = hex4 ( ":" hex4) # hex4 = 14HEXDIG # # XXX: This definition has a flaw. "::" + IPv4address must be # allowed too. Here is a replacement. # # IPv4address = 13DIGIT "." 13DIGIT "." 13DIGIT "." 13DIGIT IPV4ADDR = "\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}" # hex4 = 14HEXDIG HEX4 = "[#{HEX}]{1,4}" # lastpart = hex4 \| IPv4address LASTPART = "(?:#{HEX4}\|#{IPV4ADDR})" # hexseq1 = ( hex4 ":" ) hex4 HEXSEQ1 = "(?:#{HEX4}:)#{HEX4}" # hexseq2 = ( hex4 ":" ) lastpart HEXSEQ2 = "(?:#{HEX4}:)#{LASTPART}" # IPv6address = hexseq2 \| [ hexseq1 ] "::" [ hexseq2 ] IPV6ADDR = "(?:#{HEXSEQ2}\|(?:#{HEXSEQ1})?::(?:#{HEXSEQ2})?)" # IPv6prefix = ( hexseq1 \| [ hexseq1 ] "::" [ hexseq1 ] ) "/" 12DIGIT # unused # ipv6reference = "[" IPv6address "]" (RFC 2732) IPV6REF = "\\[#{IPV6ADDR}\\]" # host = hostname \| IPv4address # host = hostname \| IPv4address \| IPv6reference (RFC 2732) HOST = "(?:#{HOSTNAME}\|#{IPV4ADDR}\|#{IPV6REF})" # port = digit PORT = '\d' # hostport = host [ ":" port ] HOSTPORT = "#{HOST}(?::#{PORT})?" # userinfo = ( unreserved \| escaped \| # ";" \| ":" \| "&" \| "=" \| "+" \| "$" \| "," ) USERINFO = "(?:[#{UNRESERVED};:&=+$,]\|#{ESCAPED})" # pchar = unreserved \| escaped \| # ":" \| "@" \| "&" \| "=" \| "+" \| "$" \| "," PCHAR = "(?:[#{UNRESERVED}:@&=+$,]\|#{ESCAPED})" # param = pchar PARAM = "#{PCHAR}" # segment = pchar ( ";" param ) SEGMENT = "#{PCHAR}(?:;#{PARAM})" # path_segments = segment ( "/" segment ) PATH_SEGMENTS = "#{SEGMENT}(?:/#{SEGMENT})" # server = [ [ userinfo "@" ] hostport ] SERVER = "(?:#{USERINFO}@)?#{HOSTPORT}" # reg_name = 1( unreserved \| escaped \| "$" \| "," \| # ";" \| ":" \| "@" \| "&" \| "=" \| "+" ) REG_NAME = "(?:[#{UNRESERVED}$,;:@&=+]\|#{ESCAPED})+" # authority = server \| reg_name AUTHORITY = "(?:#{SERVER}\|#{REG_NAME})" # rel_segment = 1( unreserved \| escaped \| # ";" \| "@" \| "&" \| "=" \| "+" \| "$" \| "," ) REL_SEGMENT = "(?:[#{UNRESERVED};@&=+$,]\|#{ESCAPED})+" # scheme = alpha ( alpha \| digit \| "+" \| "-" \| "." ) SCHEME = "[#{ALPHA}][-+.#{ALPHA}\\d]" # abs_path = "/" path_segments ABS_PATH = "/#{PATH_SEGMENTS}" # rel_path = rel_segment [ abs_path ] REL_PATH = "#{REL_SEGMENT}(?:#{ABS_PATH})?" # net_path = "//" authority [ abs_path ] NET_PATH = "//#{AUTHORITY}(?:#{ABS_PATH})?" # hier_part = ( net_path \| abs_path ) [ "?" query ] HIER_PART = "(?:#{NET_PATH}\|#{ABS_PATH})(?:\\?(?:#{QUERY}))?" # opaque_part = uric_no_slash uric OPAQUE_PART = "#{URIC_NO_SLASH}#{URIC}" # absoluteURI = scheme ":" ( hier_part \| opaque_part ) ABS_URI = "#{SCHEME}:(?:#{HIER_PART}\|#{OPAQUE_PART})" # relativeURI = ( net_path \| abs_path \| rel_path ) [ "?" query ] REL_URI = "(?:#{NET_PATH}\|#{ABS_PATH}\|#{REL_PATH})(?:\\?#{QUERY})?" # URI-reference = [ absoluteURI \| relativeURI ] [ "#" fragment ] URI_REF = "(?:#{ABS_URI}\|#{REL_URI})?(?:##{FRAGMENT})?" # XXX: X_ABS_URI = " (#{PATTERN::SCHEME}): (?# 1: scheme) (?: (#{PATTERN::OPAQUE_PART}) (?# 2: opaque) \| (?:(?: //(?: (?:(?:(#{PATTERN::USERINFO})@)? (?# 3: userinfo) (?:(#{PATTERN::HOST})(?::(\\d))?))?(?# 4: host, 5: port) \| (#{PATTERN::REG_NAME}) (?# 6: registry) ) \| (?!//)) (?# XXX: '//' is the mark for hostport) (#{PATTERN::ABS_PATH})? (?# 7: path) )(?:\\?(#{PATTERN::QUERY}))? (?# 8: query) ) (?:\\#(#{PATTERN::FRAGMENT}))? (?# 9: fragment) " X_REL_URI = " (?: (?: // (?: (?:(#{PATTERN::USERINFO})@)? (?# 1: userinfo) (#{PATTERN::HOST})?(?::(\\d))? (?# 2: host, 3: port) \| (#{PATTERN::REG_NAME}) (?# 4: registry) ) ) \| (#{PATTERN::REL_SEGMENT}) (?# 5: rel_segment) )? (#{PATTERN::ABS_PATH})? (?# 6: abs_path) (?:\\?(#{PATTERN::QUERY}))? (?# 7: query) (?:\\#(#{PATTERN::FRAGMENT}))? (?# 8: fragment) " # :startdoc: end # PATTERN # :stopdoc: # for URI::split ABS_URI = Regexp.new('^' + PATTERN::X_ABS_URI + '$', #' Regexp::EXTENDED, 'N').freeze REL_URI = Regexp.new('^' + PATTERN::X_REL_URI + '$', #' Regexp::EXTENDED, 'N').freeze # for URI::extract URI_REF = Regexp.new(PATTERN::URI_REF, false, 'N').freeze ABS_URI_REF = Regexp.new(PATTERN::X_ABS_URI, Regexp::EXTENDED, 'N').freeze REL_URI_REF = Regexp.new(PATTERN::X_REL_URI, Regexp::EXTENDED, 'N').freeze # for URI::escape/unescape ESCAPED = Regexp.new(PATTERN::ESCAPED, false, 'N').freeze UNSAFE = Regexp.new("[^#{PATTERN::UNRESERVED}#{PATTERN::RESERVED}]", false, 'N').freeze # for Generic#initialize SCHEME = Regexp.new("^#{PATTERN::SCHEME}$", false, 'N').freeze #" USERINFO = Regexp.new("^#{PATTERN::USERINFO}$", false, 'N').freeze #" HOST = Regexp.new("^#{PATTERN::HOST}$", false, 'N').freeze #" PORT = Regexp.new("^#{PATTERN::PORT}$", false, 'N').freeze #" OPAQUE = Regexp.new("^#{PATTERN::OPAQUE_PART}$", false, 'N').freeze #" REGISTRY = Regexp.new("^#{PATTERN::REG_NAME}$", false, 'N').freeze #" ABS_PATH = Regexp.new("^#{PATTERN::ABS_PATH}$", false, 'N').freeze #" REL_PATH = Regexp.new("^#{PATTERN::REL_PATH}$", false, 'N').freeze #" QUERY = Regexp.new("^#{PATTERN::QUERY}$", false, 'N').freeze #" FRAGMENT = Regexp.new("^#{PATTERN::FRAGMENT}$", false, 'N').freeze #" # :startdoc: end # REGEXP module Util # :nodoc: def make_components_hash(klass, array_hash) tmp = {} if array_hash.kind_of?(Array) && array_hash.size == klass.component.size - 1 klass.component[1..-1].each_index do \|i\| begin tmp[klass.component[i + 1]] = array_hash[i].clone rescue TypeError tmp[klass.component[i + 1]] = array_hash[i] end end elsif array_hash.kind_of?(Hash) array_hash.each do \|key, value\| begin tmp[key] = value.clone rescue TypeError tmp[key] = value end end else raise ArgumentError, "expected Array of or Hash of components of #{klass.to_s} (#{klass.component[1..-1].join(', ')})" end tmp[:scheme] = klass.to_s.sub(/\A.::/, '').downcase return tmp end module_function :make_components_hash end module Escape include REGEXP # # == Synopsis # # URI.escape(str [, unsafe]) # # == Args # # +str+:: # String to replaces in. # +unsafe+:: # Regexp that matches all symbols that must be replaced with codes. # By default uses <tt>REGEXP::UNSAFE</tt>. # When this argument is a String, it represents a character set. # # == Description # # Escapes the string, replacing all unsafe characters with codes. # # == Usage # # require 'uri' # # enc_uri = URI.escape("http://example.com/?a=\11\15") # p enc_uri # # => "http://example.com/?a=%09%0D" # # p URI.unescape(enc_uri) # # => "http://example.com/?a=\t\r" # # p URI.escape("@?@!", "!?") # # => "@%3F@%21" # def escape(str, unsafe = UNSAFE) unless unsafe.kind_of?(Regexp) # perhaps unsafe is String object unsafe = Regexp.new("[#{Regexp.quote(unsafe)}]", false, 'N') end str.gsub(unsafe) do \|us\| tmp = '' us.each_byte do \|uc\| tmp << sprintf('%%%02X', uc) end tmp end end alias encode escape # # == Synopsis # # URI.unescape(str) # # == Args # # +str+:: # Unescapes the string. # # == Usage # # require 'uri' # # enc_uri = URI.escape("http://example.com/?a=\11\15") # p enc_uri # # => "http://example.com/?a=%09%0D" # # p URI.unescape(enc_uri) # # => "http://example.com/?a=\t\r" # def unescape(str) str.gsub(ESCAPED) do $&[1,2].hex.chr end end alias decode unescape end include REGEXP extend Escape @@schemes = {} # # Base class for all URI exceptions. # class Error < StandardError; end # # Not a URI. # class InvalidURIError < Error; end # # Not a URI component. # class InvalidComponentError < Error; end # # URI is valid, bad usage is not. # class BadURIError < Error; end # # == Synopsis # # URI::split(uri) # # == Args # # +uri+:: # String with URI. # # == Description # # Splits the string on following parts and returns array with result: # # Scheme # * Userinfo # * Host # * Port # * Registry # * Path # * Opaque # * Query # * Fragment # # == Usage # # require 'uri' # # p URI.split("http://www.ruby-lang.org/") # # => ["http", nil, "www.ruby-lang.org", nil, nil, "/", nil, nil, nil] # def self.split(uri) case uri when '' # null uri when ABS_URI scheme, opaque, userinfo, host, port, registry, path, query, fragment = $~[1..-1] # URI-reference = [ absoluteURI \| relativeURI ] [ "#" fragment ] # absoluteURI = scheme ":" ( hier_part \| opaque_part ) # hier_part = ( net_path \| abs_path ) [ "?" query ] # opaque_part = uric_no_slash uric # abs_path = "/" path_segments # net_path = "//" authority [ abs_path ] # authority = server \| reg_name # server = [ [ userinfo "@" ] hostport ] if !scheme raise InvalidURIError, "bad URI(absolute but no scheme): #{uri}" end if !opaque && (!path && (!host && !registry)) raise InvalidURIError, "bad URI(absolute but no path): #{uri}" end when REL_URI scheme = nil opaque = nil userinfo, host, port, registry, rel_segment, abs_path, query, fragment = $~[1..-1] if rel_segment && abs_path path = rel_segment + abs_path elsif rel_segment path = rel_segment elsif abs_path path = abs_path end # URI-reference = [ absoluteURI \| relativeURI ] [ "#" fragment ] # relativeURI = ( net_path \| abs_path \| rel_path ) [ "?" query ] # net_path = "//" authority [ abs_path ] # abs_path = "/" path_segments # rel_path = rel_segment [ abs_path ] # authority = server \| reg_name # server = [ [ userinfo "@" ] hostport ] else raise InvalidURIError, "bad URI(is not URI?): #{uri}" end path = '' if !path && !opaque # (see RFC2396 Section 5.2) ret = [ scheme, userinfo, host, port, # X registry, # X path, # Y opaque, # Y query, fragment ] return ret end # # == Synopsis # # URI::parse(uri_str) # # == Args # # +uri_str+:: # String with URI. # # == Description # # Creates one of the URI's subclasses instance from the string. # # == Raises # # URI::InvalidURIError # Raised if URI given is not a correct one. # # == Usage # # require 'uri' # # uri = URI.parse("http://www.ruby-lang.org/") # p uri # # => #<URI::HTTP:0x202281be URL:http://www.ruby-lang.org/> # p uri.scheme # # => "http" # p uri.host # # => "www.ruby-lang.org" # def self.parse(uri) scheme, userinfo, host, port, registry, path, opaque, query, fragment = self.split(uri) if scheme && @@schemes.include?(scheme.upcase) @@schemes[scheme.upcase].new(scheme, userinfo, host, port, registry, path, opaque, query, fragment) else Generic.new(scheme, userinfo, host, port, registry, path, opaque, query, fragment) end end # # == Synopsis # # URI::join(str[, str, ...]) # # == Args # # +str+:: # String(s) to work with # # == Description # # Joins URIs. # # == Usage # # require 'uri' # # p URI.join("http://localhost/","main.rbx") # # => #<URI::HTTP:0x2022ac02 URL:http://localhost/main.rbx> # def self.join(str) u = self.parse(str[0]) str[1 .. -1].each do \|x\| u = u.merge(x) end u end # # == Synopsis # # URI::extract(str[, schemes][,&blk]) # # == Args # # +str+:: # String to extract URIs from. # +schemes+:: # Limit URI matching to a specific schemes. # # == Description # # Extracts URIs from a string. If block given, iterates through all matched URIs. # Returns nil if block given or array with matches. # # == Usage # # require "uri" # # URI.extract("text here http://foo.example.org/bla and here mailto:test@example.com and here also.") # # => ["http://foo.example.com/bla", "mailto:test@example.com"] # def self.extract(str, schemes = nil, &block) if block_given? str.scan(regexp(schemes)) { yield $& } nil else result = [] str.scan(regexp(schemes)) { result.push $& } result end end # # == Synopsis # # URI::regexp([match_schemes]) # # == Args # # +match_schemes+:: # Array of schemes. If given, resulting regexp matches to URIs # whose scheme is one of the match_schemes. # # == Description # Returns a Regexp object which matches to URI-like strings. # The Regexp object returned by this method includes arbitrary # number of capture group (parentheses). Never rely on it's number. # # == Usage # # require 'uri' # # # extract first URI from html_string # html_string.slice(URI.regexp) # # # remove ftp URIs # html_string.sub(URI.regexp(['ftp']) # # # You should not rely on the number of parentheses # html_string.scan(URI.regexp) do \|matches\| # p $& # end # def self.regexp(schemes = nil) unless schemes ABS_URI_REF else /(?=#{Regexp.union(schemes)}:)#{PATTERN::X_ABS_URI}/xn end end end module Kernel # alias for URI.parse. # # This method is introduced at 1.8.2. def URI(uri_str) # :doc: URI.parse(uri_str) end module_function :URI end Back

Edit File : common.rb | Size : 17.16 KB

# = uri/common.rb
#
# Author:: Akira Yamada <akira@ruby-lang.org>
# Revision:: $Id: common.rb 14178 2007-12-10 09:31:55Z matz $
# License:: 
#   You can redistribute it and/or modify it under the same term as Ruby.
#

module URI
  module REGEXP
    #
    # Patterns used to parse URI's
    #
    module PATTERN
      # :stopdoc:

# RFC 2396 (URI Generic Syntax)
      # RFC 2732 (IPv6 Literal Addresses in URL's)
      # RFC 2373 (IPv6 Addressing Architecture)

# alpha         = lowalpha | upalpha
      ALPHA = "a-zA-Z"
      # alphanum      = alpha | digit
      ALNUM = "#{ALPHA}\\d"

# hex           = digit | "A" | "B" | "C" | "D" | "E" | "F" |
      #                         "a" | "b" | "c" | "d" | "e" | "f"
      HEX     = "a-fA-F\\d"
      # escaped       = "%" hex hex
      ESCAPED = "%[#{HEX}]{2}"
      # mark          = "-" | "_" | "." | "!" | "~" | "*" | "'" |
      #                 "(" | ")"
      # unreserved    = alphanum | mark
      UNRESERVED = "-_.!~*'()#{ALNUM}"
      # reserved      = ";" | "/" | "?" | ":" | "@" | "&" | "=" | "+" |
      #                 "$" | ","
      # reserved      = ";" | "/" | "?" | ":" | "@" | "&" | "=" | "+" | 
      #                 "$" | "," | "[" | "]" (RFC 2732)
      RESERVED = ";/?:@&=+$,\\[\\]"

# uric          = reserved | unreserved | escaped
      URIC = "(?:[#{UNRESERVED}#{RESERVED}]|#{ESCAPED})"
      # uric_no_slash = unreserved | escaped | ";" | "?" | ":" | "@" |
      #                 "&" | "=" | "+" | "$" | ","
      URIC_NO_SLASH = "(?:[#{UNRESERVED};?:@&=+$,]|#{ESCAPED})"
      # query         = *uric
      QUERY = "#{URIC}*"
      # fragment      = *uric
      FRAGMENT = "#{URIC}*"

# domainlabel   = alphanum | alphanum *( alphanum | "-" ) alphanum
      DOMLABEL = "(?:[#{ALNUM}](?:[-#{ALNUM}]*[#{ALNUM}])?)"
      # toplabel      = alpha | alpha *( alphanum | "-" ) alphanum
      TOPLABEL = "(?:[#{ALPHA}](?:[-#{ALNUM}]*[#{ALNUM}])?)"
      # hostname      = *( domainlabel "." ) toplabel [ "." ]
      HOSTNAME = "(?:#{DOMLABEL}\\.)*#{TOPLABEL}\\.?"

# RFC 2373, APPENDIX B:
      # IPv6address = hexpart [ ":" IPv4address ]
      # IPv4address   = 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT
      # hexpart = hexseq | hexseq "::" [ hexseq ] | "::" [ hexseq ]
      # hexseq  = hex4 *( ":" hex4)
      # hex4    = 1*4HEXDIG
      #
      # XXX: This definition has a flaw. "::" + IPv4address must be
      # allowed too.  Here is a replacement.
      #
      # IPv4address = 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT
      IPV4ADDR = "\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}"
      # hex4     = 1*4HEXDIG
      HEX4 = "[#{HEX}]{1,4}"
      # lastpart = hex4 | IPv4address
      LASTPART = "(?:#{HEX4}|#{IPV4ADDR})"
      # hexseq1  = *( hex4 ":" ) hex4
      HEXSEQ1 = "(?:#{HEX4}:)*#{HEX4}"
      # hexseq2  = *( hex4 ":" ) lastpart
      HEXSEQ2 = "(?:#{HEX4}:)*#{LASTPART}"
      # IPv6address = hexseq2 | [ hexseq1 ] "::" [ hexseq2 ]
      IPV6ADDR = "(?:#{HEXSEQ2}|(?:#{HEXSEQ1})?::(?:#{HEXSEQ2})?)"

# IPv6prefix  = ( hexseq1 | [ hexseq1 ] "::" [ hexseq1 ] ) "/" 1*2DIGIT
      # unused

# ipv6reference = "[" IPv6address "]" (RFC 2732)
      IPV6REF = "\\[#{IPV6ADDR}\\]"

# host          = hostname | IPv4address
      # host          = hostname | IPv4address | IPv6reference (RFC 2732)
      HOST = "(?:#{HOSTNAME}|#{IPV4ADDR}|#{IPV6REF})"
      # port          = *digit
      PORT = '\d*'
      # hostport      = host [ ":" port ]
      HOSTPORT = "#{HOST}(?::#{PORT})?"

# userinfo      = *( unreserved | escaped |
      #                    ";" | ":" | "&" | "=" | "+" | "$" | "," )
      USERINFO = "(?:[#{UNRESERVED};:&=+$,]|#{ESCAPED})*"

# pchar         = unreserved | escaped |
      #                 ":" | "@" | "&" | "=" | "+" | "$" | ","
      PCHAR = "(?:[#{UNRESERVED}:@&=+$,]|#{ESCAPED})"
      # param         = *pchar
      PARAM = "#{PCHAR}*"
      # segment       = *pchar *( ";" param )
      SEGMENT = "#{PCHAR}*(?:;#{PARAM})*"
      # path_segments = segment *( "/" segment )
      PATH_SEGMENTS = "#{SEGMENT}(?:/#{SEGMENT})*"

# server        = [ [ userinfo "@" ] hostport ]
      SERVER = "(?:#{USERINFO}@)?#{HOSTPORT}"
      # reg_name      = 1*( unreserved | escaped | "$" | "," |
      #                     ";" | ":" | "@" | "&" | "=" | "+" )
      REG_NAME = "(?:[#{UNRESERVED}$,;:@&=+]|#{ESCAPED})+"
      # authority     = server | reg_name
      AUTHORITY = "(?:#{SERVER}|#{REG_NAME})"

# rel_segment   = 1*( unreserved | escaped |
      #                     ";" | "@" | "&" | "=" | "+" | "$" | "," )
      REL_SEGMENT = "(?:[#{UNRESERVED};@&=+$,]|#{ESCAPED})+"

# scheme        = alpha *( alpha | digit | "+" | "-" | "." )
      SCHEME = "[#{ALPHA}][-+.#{ALPHA}\\d]*"

# abs_path      = "/"  path_segments
      ABS_PATH = "/#{PATH_SEGMENTS}"
      # rel_path      = rel_segment [ abs_path ]
      REL_PATH = "#{REL_SEGMENT}(?:#{ABS_PATH})?"
      # net_path      = "//" authority [ abs_path ]
      NET_PATH   = "//#{AUTHORITY}(?:#{ABS_PATH})?"

# hier_part     = ( net_path | abs_path ) [ "?" query ]
      HIER_PART   = "(?:#{NET_PATH}|#{ABS_PATH})(?:\\?(?:#{QUERY}))?"
      # opaque_part   = uric_no_slash *uric
      OPAQUE_PART = "#{URIC_NO_SLASH}#{URIC}*"

# absoluteURI   = scheme ":" ( hier_part | opaque_part )
      ABS_URI   = "#{SCHEME}:(?:#{HIER_PART}|#{OPAQUE_PART})"
      # relativeURI   = ( net_path | abs_path | rel_path ) [ "?" query ]
      REL_URI = "(?:#{NET_PATH}|#{ABS_PATH}|#{REL_PATH})(?:\\?#{QUERY})?"

# URI-reference = [ absoluteURI | relativeURI ] [ "#" fragment ]
      URI_REF = "(?:#{ABS_URI}|#{REL_URI})?(?:##{FRAGMENT})?"

# XXX:
      X_ABS_URI = "
        (#{PATTERN::SCHEME}):                     (?# 1: scheme)
        (?:
           (#{PATTERN::OPAQUE_PART})              (?# 2: opaque)
        |
           (?:(?:
             //(?:
                 (?:(?:(#{PATTERN::USERINFO})@)?  (?# 3: userinfo)
                   (?:(#{PATTERN::HOST})(?::(\\d*))?))?(?# 4: host, 5: port)
               |
                 (#{PATTERN::REG_NAME})           (?# 6: registry)
               )
             |
             (?!//))                              (?# XXX: '//' is the mark for hostport)
             (#{PATTERN::ABS_PATH})?              (?# 7: path)
           )(?:\\?(#{PATTERN::QUERY}))?           (?# 8: query)
        )
        (?:\\#(#{PATTERN::FRAGMENT}))?            (?# 9: fragment)
      "
      X_REL_URI = "
        (?:
          (?:
            //
            (?:
              (?:(#{PATTERN::USERINFO})@)?       (?# 1: userinfo)
                (#{PATTERN::HOST})?(?::(\\d*))?  (?# 2: host, 3: port)
            |
              (#{PATTERN::REG_NAME})             (?# 4: registry)
            )
          )
        |
          (#{PATTERN::REL_SEGMENT})              (?# 5: rel_segment)
        )?
        (#{PATTERN::ABS_PATH})?                  (?# 6: abs_path)
        (?:\\?(#{PATTERN::QUERY}))?              (?# 7: query)
        (?:\\#(#{PATTERN::FRAGMENT}))?           (?# 8: fragment)
      "
      # :startdoc:
    end # PATTERN

# :stopdoc:

# for URI::split
    ABS_URI = Regexp.new('^' + PATTERN::X_ABS_URI + '$', #'
                         Regexp::EXTENDED, 'N').freeze
    REL_URI = Regexp.new('^' + PATTERN::X_REL_URI + '$', #'
                         Regexp::EXTENDED, 'N').freeze

# for URI::extract
    URI_REF     = Regexp.new(PATTERN::URI_REF, false, 'N').freeze
    ABS_URI_REF = Regexp.new(PATTERN::X_ABS_URI, Regexp::EXTENDED, 'N').freeze
    REL_URI_REF = Regexp.new(PATTERN::X_REL_URI, Regexp::EXTENDED, 'N').freeze

# for URI::escape/unescape
    ESCAPED = Regexp.new(PATTERN::ESCAPED, false, 'N').freeze
    UNSAFE  = Regexp.new("[^#{PATTERN::UNRESERVED}#{PATTERN::RESERVED}]",
                         false, 'N').freeze

# for Generic#initialize
    SCHEME   = Regexp.new("^#{PATTERN::SCHEME}$", false, 'N').freeze #"
    USERINFO = Regexp.new("^#{PATTERN::USERINFO}$", false, 'N').freeze #"
    HOST     = Regexp.new("^#{PATTERN::HOST}$", false, 'N').freeze #"
    PORT     = Regexp.new("^#{PATTERN::PORT}$", false, 'N').freeze #"
    OPAQUE   = Regexp.new("^#{PATTERN::OPAQUE_PART}$", false, 'N').freeze #"
    REGISTRY = Regexp.new("^#{PATTERN::REG_NAME}$", false, 'N').freeze #"
    ABS_PATH = Regexp.new("^#{PATTERN::ABS_PATH}$", false, 'N').freeze #"
    REL_PATH = Regexp.new("^#{PATTERN::REL_PATH}$", false, 'N').freeze #"
    QUERY    = Regexp.new("^#{PATTERN::QUERY}$", false, 'N').freeze #"
    FRAGMENT = Regexp.new("^#{PATTERN::FRAGMENT}$", false, 'N').freeze #"
    # :startdoc:
  end # REGEXP

module Util # :nodoc:
    def make_components_hash(klass, array_hash)
      tmp = {}
      if array_hash.kind_of?(Array) &&
          array_hash.size == klass.component.size - 1
        klass.component[1..-1].each_index do |i|
          begin
            tmp[klass.component[i + 1]] = array_hash[i].clone
          rescue TypeError
            tmp[klass.component[i + 1]] = array_hash[i]
          end
        end

elsif array_hash.kind_of?(Hash)
        array_hash.each do |key, value|
          begin
            tmp[key] = value.clone
          rescue TypeError
            tmp[key] = value
          end
        end
      else
        raise ArgumentError, 
          "expected Array of or Hash of components of #{klass.to_s} (#{klass.component[1..-1].join(', ')})"
      end
      tmp[:scheme] = klass.to_s.sub(/\A.*::/, '').downcase

return tmp
    end
    module_function :make_components_hash
  end

module Escape
    include REGEXP

#
    # == Synopsis
    #
    #   URI.escape(str [, unsafe])
    #
    # == Args
    #
    # +str+::
    #   String to replaces in.
    # +unsafe+::
    #   Regexp that matches all symbols that must be replaced with codes.
    #   By default uses <tt>REGEXP::UNSAFE</tt>.
    #   When this argument is a String, it represents a character set.
    #
    # == Description
    #
    # Escapes the string, replacing all unsafe characters with codes.
    #
    # == Usage
    #
    #   require 'uri'
    #
    #   enc_uri = URI.escape("http://example.com/?a=\11\15")
    #   p enc_uri
    #   # => "http://example.com/?a=%09%0D"
    #
    #   p URI.unescape(enc_uri)
    #   # => "http://example.com/?a=\t\r"
    #
    #   p URI.escape("@?@!", "!?")
    #   # => "@%3F@%21"
    #
    def escape(str, unsafe = UNSAFE)
      unless unsafe.kind_of?(Regexp)
        # perhaps unsafe is String object
        unsafe = Regexp.new("[#{Regexp.quote(unsafe)}]", false, 'N')
      end
      str.gsub(unsafe) do |us|
        tmp = ''
        us.each_byte do |uc|
          tmp << sprintf('%%%02X', uc)
        end
        tmp
      end
    end
    alias encode escape
    #
    # == Synopsis
    #
    #   URI.unescape(str)
    #
    # == Args
    #
    # +str+::
    #   Unescapes the string.
    #
    # == Usage
    #
    #   require 'uri'
    #
    #   enc_uri = URI.escape("http://example.com/?a=\11\15")
    #   p enc_uri
    #   # => "http://example.com/?a=%09%0D"
    #
    #   p URI.unescape(enc_uri)
    #   # => "http://example.com/?a=\t\r"
    #
    def unescape(str)
      str.gsub(ESCAPED) do
        $&[1,2].hex.chr
      end
    end
    alias decode unescape
  end

include REGEXP
  extend Escape

@@schemes = {}
  
  #
  # Base class for all URI exceptions.
  #
  class Error < StandardError; end
  #
  # Not a URI.
  #
  class InvalidURIError < Error; end
  #
  # Not a URI component.
  #
  class InvalidComponentError < Error; end
  #
  # URI is valid, bad usage is not.
  #
  class BadURIError < Error; end

#
  # == Synopsis
  #
  #   URI::split(uri)
  #
  # == Args
  #
  # +uri+::
  #   String with URI.
  #
  # == Description
  #
  # Splits the string on following parts and returns array with result:
  #
  #   * Scheme
  #   * Userinfo
  #   * Host
  #   * Port
  #   * Registry
  #   * Path
  #   * Opaque
  #   * Query
  #   * Fragment
  # 
  # == Usage
  #
  #   require 'uri'
  #
  #   p URI.split("http://www.ruby-lang.org/")
  #   # => ["http", nil, "www.ruby-lang.org", nil, nil, "/", nil, nil, nil]
  #
  def self.split(uri)
    case uri
    when ''
      # null uri

when ABS_URI
      scheme, opaque, userinfo, host, port, 
        registry, path, query, fragment = $~[1..-1]

# URI-reference = [ absoluteURI | relativeURI ] [ "#" fragment ]

# absoluteURI   = scheme ":" ( hier_part | opaque_part )
      # hier_part     = ( net_path | abs_path ) [ "?" query ]
      # opaque_part   = uric_no_slash *uric

# abs_path      = "/"  path_segments
      # net_path      = "//" authority [ abs_path ]

# authority     = server | reg_name
      # server        = [ [ userinfo "@" ] hostport ]

if !scheme
        raise InvalidURIError, 
          "bad URI(absolute but no scheme): #{uri}"
      end
      if !opaque && (!path && (!host && !registry))
        raise InvalidURIError,
          "bad URI(absolute but no path): #{uri}" 
      end

when REL_URI
      scheme = nil
      opaque = nil

userinfo, host, port, registry, 
        rel_segment, abs_path, query, fragment = $~[1..-1]
      if rel_segment && abs_path
        path = rel_segment + abs_path
      elsif rel_segment
        path = rel_segment
      elsif abs_path
        path = abs_path
      end

# URI-reference = [ absoluteURI | relativeURI ] [ "#" fragment ]

# relativeURI   = ( net_path | abs_path | rel_path ) [ "?" query ]

# net_path      = "//" authority [ abs_path ]
      # abs_path      = "/"  path_segments
      # rel_path      = rel_segment [ abs_path ]

# authority     = server | reg_name
      # server        = [ [ userinfo "@" ] hostport ]

else
      raise InvalidURIError, "bad URI(is not URI?): #{uri}"
    end

path = '' if !path && !opaque # (see RFC2396 Section 5.2)
    ret = [
      scheme, 
      userinfo, host, port,         # X
      registry,                        # X
      path,                         # Y
      opaque,                        # Y
      query,
      fragment
    ]
    return ret
  end

#
  # == Synopsis
  #
  #   URI::parse(uri_str)
  #
  # == Args
  #
  # +uri_str+::
  #   String with URI.
  #
  # == Description
  #
  # Creates one of the URI's subclasses instance from the string.
  #  
  # == Raises
  #
  # URI::InvalidURIError
  #   Raised if URI given is not a correct one.
  #
  # == Usage
  #
  #   require 'uri'
  #
  #   uri = URI.parse("http://www.ruby-lang.org/")
  #   p uri
  #   # => #<URI::HTTP:0x202281be URL:http://www.ruby-lang.org/>
  #   p uri.scheme 
  #   # => "http" 
  #   p uri.host 
  #   # => "www.ruby-lang.org" 
  # 
  def self.parse(uri)
    scheme, userinfo, host, port, 
      registry, path, opaque, query, fragment = self.split(uri)

if scheme && @@schemes.include?(scheme.upcase)
      @@schemes[scheme.upcase].new(scheme, userinfo, host, port, 
                                   registry, path, opaque, query, 
                                   fragment)
    else
      Generic.new(scheme, userinfo, host, port, 
                  registry, path, opaque, query, 
                  fragment)
    end
  end

#
  # == Synopsis
  #
  #   URI::join(str[, str, ...])
  #
  # == Args
  #
  # +str+::
  #   String(s) to work with
  #
  # == Description
  #
  # Joins URIs.
  #
  # == Usage
  #
  #   require 'uri'
  #
  #   p URI.join("http://localhost/","main.rbx")
  #   # => #<URI::HTTP:0x2022ac02 URL:http://localhost/main.rbx>
  #
  def self.join(*str)
    u = self.parse(str[0])
    str[1 .. -1].each do |x|
      u = u.merge(x)
    end
    u
  end

#
  # == Synopsis
  #
  #   URI::extract(str[, schemes][,&blk])
  #
  # == Args
  #
  # +str+:: 
  #   String to extract URIs from.
  # +schemes+::
  #   Limit URI matching to a specific schemes.
  #
  # == Description
  #
  # Extracts URIs from a string. If block given, iterates through all matched URIs.
  # Returns nil if block given or array with matches.
  #
  # == Usage
  #
  #   require "uri"
  #
  #   URI.extract("text here http://foo.example.org/bla and here mailto:test@example.com and here also.")
  #   # => ["http://foo.example.com/bla", "mailto:test@example.com"]
  #
  def self.extract(str, schemes = nil, &block)
    if block_given?
      str.scan(regexp(schemes)) { yield $& }
      nil
    else
      result = []
      str.scan(regexp(schemes)) { result.push $& }
      result
    end
  end

#
  # == Synopsis
  #
  #   URI::regexp([match_schemes])
  #
  # == Args
  #
  # +match_schemes+:: 
  #   Array of schemes. If given, resulting regexp matches to URIs
  #   whose scheme is one of the match_schemes.
  # 
  # == Description
  # Returns a Regexp object which matches to URI-like strings.
  # The Regexp object returned by this method includes arbitrary
  # number of capture group (parentheses).  Never rely on it's number.
  # 
  # == Usage
  #
  #   require 'uri'
  #
  #   # extract first URI from html_string
  #   html_string.slice(URI.regexp)
  # 
  #   # remove ftp URIs
  #   html_string.sub(URI.regexp(['ftp'])
  # 
  #   # You should not rely on the number of parentheses
  #   html_string.scan(URI.regexp) do |*matches|
  #     p $&
  #   end
  #
  def self.regexp(schemes = nil)
    unless schemes
      ABS_URI_REF
    else
      /(?=#{Regexp.union(*schemes)}:)#{PATTERN::X_ABS_URI}/xn
    end
  end

end

module Kernel
  # alias for URI.parse.
  #
  # This method is introduced at 1.8.2.
  def URI(uri_str) # :doc:
    URI.parse(uri_str)
  end
  module_function :URI
end

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