class URI::RFC2396_Parser

class that Parses String's into URI's

It contains a Hash set of patterns and Regexp's that match and validate.

Attributes

pattern[R]

The Hash of patterns.

Public Class Methods

new(opts = {}) click to toggle source

Synopsis¶ ↑

URI::Parser.new([opts])

Args¶ ↑

The constructor accepts a hash as options for parser. Keys of options are pattern names of URI components and values of options are pattern strings. The constructor generates set of regexps for parsing URIs.

You can use the following keys:

* :ESCAPED (URI::PATTERN::ESCAPED in default)
* :UNRESERVED (URI::PATTERN::UNRESERVED in default)
* :DOMLABEL (URI::PATTERN::DOMLABEL in default)
* :TOPLABEL (URI::PATTERN::TOPLABEL in default)
* :HOSTNAME (URI::PATTERN::HOSTNAME in default)

Examples¶ ↑

p = URI::Parser.new(:ESCAPED => "(?:%[a-fA-F0-9]{2}|%u[a-fA-F0-9]{4})")
u = p.parse("http://example.jp/%uABCD") #=> #<URI::HTTP:0xb78cf4f8 URL:http://example.jp/%uABCD>
URI.parse(u.to_s) #=> raises URI::InvalidURIError

s = "http://example.com/ABCD"
u1 = p.parse(s) #=> #<URI::HTTP:0xb78c3220 URL:http://example.com/ABCD>
u2 = URI.parse(s) #=> #<URI::HTTP:0xb78b6d54 URL:http://example.com/ABCD>
u1 == u2 #=> true
u1.eql?(u2) #=> false

# File lib/uri/rfc2396_parser.rb, line 99
def initialize(opts = {})
  @pattern = initialize_pattern(opts)
  @pattern.each_value(&:freeze)
  @pattern.freeze

  @regexp = initialize_regexp(@pattern)
  @regexp.each_value(&:freeze)
  @regexp.freeze
end

Public Instance Methods

escape( str ) click to toggle source

escape( str, unsafe )

Args¶ ↑

str: String to make safe
unsafe: Regexp to apply. Defaults to self.regexp

Description¶ ↑

constructs a safe String from str, removing unsafe characters, replacing them with codes.

# File lib/uri/rfc2396_parser.rb, line 299
def escape(str, unsafe = @regexp[:UNSAFE])
  unless unsafe.kind_of?(Regexp)
    # perhaps unsafe is String object
    unsafe = Regexp.new("[#{Regexp.quote(unsafe)}]", false)
  end
  str.gsub(unsafe) do
    us = $&
    tmp = ''
    us.each_byte do |uc|
      tmp << sprintf('%%%02X', uc)
    end
    tmp
  end.force_encoding(Encoding::US_ASCII)
end

extract( str ) click to toggle source

extract( str, schemes )

extract( str, schemes ) {|item| block }

Args¶ ↑

str: String to search
schemes: Patterns to apply to str

Description¶ ↑

Attempts to parse and merge a set of URIs If no block given , then returns the result, else it calls block for each element in result.

Args¶ ↑

uris: an Array of Strings

Description¶ ↑

Attempts to parse and merge a set of URIs

# File lib/uri/rfc2396_parser.rb, line 235
def join(*uris)
  uris[0] = convert_to_uri(uris[0])
  uris.inject :merge
end

make_regexp(schemes = nil) click to toggle source

returns Regexp that is default self.regexp, unless schemes is provided. Then it is a Regexp.union with self.pattern

# File lib/uri/rfc2396_parser.rb, line 274
def make_regexp(schemes = nil)
  unless schemes
    @regexp[:ABS_URI_REF]
  else
    /(?=#{Regexp.union(*schemes)}:)#{@pattern[:X_ABS_URI]}/x
  end
end

parse(uri) click to toggle source

Args¶ ↑

uri: String

Description¶ ↑

parses uri and constructs either matching URI scheme object (FTP, HTTP, HTTPS, LDAP, LDAPS, or MailTo) or URI::Generic

Usage¶ ↑

p = URI::Parser.new
p.parse("ldap://ldap.example.com/dc=example?user=john")
#=> #<URI::LDAP:0x00000000b9e7e8 URL:ldap://ldap.example.com/dc=example?user=john>

# File lib/uri/rfc2396_parser.rb, line 209
def parse(uri)
  scheme, userinfo, host, port,
    registry, path, opaque, query, fragment = self.split(uri)

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

split(uri) click to toggle source

Returns a split URI against regexp

# File lib/uri/rfc2396_parser.rb, line 120
def split(uri)
  case uri
  when ''
    # null uri

  when @regexp[: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 @regexp[: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

unescape( str ) click to toggle source

unescape( str, unsafe )

Args¶ ↑

str: String to remove escapes from
unsafe: Regexp to apply. Defaults to self.regexp

Description¶ ↑

Removes escapes from str

# File lib/uri/rfc2396_parser.rb, line 330
def unescape(str, escaped = @regexp[:ESCAPED])
  str.gsub(escaped) { [$&[1, 2].hex].pack('C') }.force_encoding(str.encoding)
end

Private Instance Methods

convert_to_uri(uri) click to toggle source

# File lib/uri/rfc2396_parser.rb, line 531
def convert_to_uri(uri)
  if uri.is_a?(URI::Generic)
    uri
  elsif uri = String.try_convert(uri)
    parse(uri)
  else
    raise ArgumentError,
      "bad argument (expected URI object or URI string)"
  end
end

initialize_pattern(opts = {}) click to toggle source

Constructs the default Hash of patterns

# File lib/uri/rfc2396_parser.rb, line 342
def initialize_pattern(opts = {})
  ret = {}
  ret[:ESCAPED] = escaped = (opts.delete(:ESCAPED) || PATTERN::ESCAPED)
  ret[:UNRESERVED] = unreserved = opts.delete(:UNRESERVED) || PATTERN::UNRESERVED
  ret[:RESERVED] = reserved = opts.delete(:RESERVED) || PATTERN::RESERVED
  ret[:DOMLABEL] = opts.delete(:DOMLABEL) || PATTERN::DOMLABEL
  ret[:TOPLABEL] = opts.delete(:TOPLABEL) || PATTERN::TOPLABEL
  ret[:HOSTNAME] = hostname = opts.delete(:HOSTNAME)

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

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

  # hostname      = *( domainlabel "." ) toplabel [ "." ]
  # reg-name      = *( unreserved / pct-encoded / sub-delims ) # RFC3986
  unless hostname
    ret[:HOSTNAME] = hostname = "(?:[a-zA-Z0-9\\-.]|%\\h\\h)+"
  end

  # 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
  ret[:IPV4ADDR] = ipv4addr = "\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}"
  # hex4     = 1*4HEXDIG
  hex4 = "[#{PATTERN::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 ]
  ret[:IPV6ADDR] = ipv6addr = "(?:#{hexseq2}|(?:#{hexseq1})?::(?:#{hexseq2})?)"

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

  # ipv6reference = "[" IPv6address "]" (RFC 2732)
  ret[:IPV6REF] = ipv6ref = "\\[#{ipv6addr}\\]"

  # host          = hostname | IPv4address
  # host          = hostname | IPv4address | IPv6reference (RFC 2732)
  ret[:HOST] = host = "(?:#{hostname}|#{ipv4addr}|#{ipv6ref})"
  # port          = *digit
  ret[:PORT] = port = '\d*'
  # hostport      = host [ ":" port ]
  ret[:HOSTPORT] = hostport = "#{host}(?::#{port})?"

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

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

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

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

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

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

  # hier_part     = ( net_path | abs_path ) [ "?" query ]
  ret[:HIER_PART] = hier_part = "(?:#{net_path}|#{abs_path})(?:\\?(?:#{query}))?"
  # opaque_part   = uric_no_slash *uric
  ret[:OPAQUE_PART] = opaque_part = "#{uric_no_slash}#{uric}*"

  # absoluteURI   = scheme ":" ( hier_part | opaque_part )
  ret[:ABS_URI] = abs_uri = "#{scheme}:(?:#{hier_part}|#{opaque_part})"
  # relativeURI   = ( net_path | abs_path | rel_path ) [ "?" query ]
  ret[:REL_URI] = rel_uri = "(?:#{net_path}|#{abs_path}|#{rel_path})(?:\\?#{query})?"

  # URI-reference = [ absoluteURI | relativeURI ] [ "#" fragment ]
  ret[:URI_REF] = "(?:#{abs_uri}|#{rel_uri})?(?:##{fragment})?"

  ret[:X_ABS_URI] = "
    (#{scheme}):                           (?# 1: scheme)
    (?:
       (#{opaque_part})                    (?# 2: opaque)
    |
       (?:(?:
         //(?:
             (?:(?:(#{userinfo})@)?        (?# 3: userinfo)
               (?:(#{host})(?::(\\d*))?))? (?# 4: host, 5: port)
           |
             (#{reg_name})                 (?# 6: registry)
           )
         |
         (?!//))                           (?# XXX: '//' is the mark for hostport)
         (#{abs_path})?                    (?# 7: path)
       )(?:\\?(#{query}))?                 (?# 8: query)
    )
    (?:\\#(#{fragment}))?                  (?# 9: fragment)
  "

  ret[:X_REL_URI] = "
    (?:
      (?:
        //
        (?:
          (?:(#{userinfo})@)?       (?# 1: userinfo)
            (#{host})?(?::(\\d*))?  (?# 2: host, 3: port)
        |
          (#{reg_name})             (?# 4: registry)
        )
      )
    |
      (#{rel_segment})              (?# 5: rel_segment)
    )?
    (#{abs_path})?                  (?# 6: abs_path)
    (?:\\?(#{query}))?              (?# 7: query)
    (?:\\#(#{fragment}))?           (?# 8: fragment)
  "

  ret
end

initialize_regexp(pattern) click to toggle source

Constructs the default Hash of Regexp's

# File lib/uri/rfc2396_parser.rb, line 500
def initialize_regexp(pattern)
  ret = {}

  # for URI::split
  ret[:ABS_URI] = Regexp.new('\A\s*' + pattern[:X_ABS_URI] + '\s*\z', Regexp::EXTENDED)
  ret[:REL_URI] = Regexp.new('\A\s*' + pattern[:X_REL_URI] + '\s*\z', Regexp::EXTENDED)

  # for URI::extract
  ret[:URI_REF]     = Regexp.new(pattern[:URI_REF])
  ret[:ABS_URI_REF] = Regexp.new(pattern[:X_ABS_URI], Regexp::EXTENDED)
  ret[:REL_URI_REF] = Regexp.new(pattern[:X_REL_URI], Regexp::EXTENDED)

  # for URI::escape/unescape
  ret[:ESCAPED] = Regexp.new(pattern[:ESCAPED])
  ret[:UNSAFE]  = Regexp.new("[^#{pattern[:UNRESERVED]}#{pattern[:RESERVED]}]")

  # for Generic#initialize
  ret[:SCHEME]   = Regexp.new("\\A#{pattern[:SCHEME]}\\z")
  ret[:USERINFO] = Regexp.new("\\A#{pattern[:USERINFO]}\\z")
  ret[:HOST]     = Regexp.new("\\A#{pattern[:HOST]}\\z")
  ret[:PORT]     = Regexp.new("\\A#{pattern[:PORT]}\\z")
  ret[:OPAQUE]   = Regexp.new("\\A#{pattern[:OPAQUE_PART]}\\z")
  ret[:REGISTRY] = Regexp.new("\\A#{pattern[:REG_NAME]}\\z")
  ret[:ABS_PATH] = Regexp.new("\\A#{pattern[:ABS_PATH]}\\z")
  ret[:REL_PATH] = Regexp.new("\\A#{pattern[:REL_PATH]}\\z")
  ret[:QUERY]    = Regexp.new("\\A#{pattern[:QUERY]}\\z")
  ret[:FRAGMENT] = Regexp.new("\\A#{pattern[:FRAGMENT]}\\z")

  ret
end