Import RDoc r101.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@18121 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2853 insertions, 0 deletions

diff --git a/lib/rdoc/parser/ruby.rb b/lib/rdoc/parser/ruby.rb
new file mode 100644
index 0000000000..e00d727f9e
--- /dev/null
+++ b/lib/rdoc/parser/ruby.rb
@@ -0,0 +1,2853 @@
+##
+# This file contains stuff stolen outright from:
+#
+#   rtags.rb -
+#   ruby-lex.rb - ruby lexcal analyzer
+#   ruby-token.rb - ruby tokens
+#       by Keiju ISHITSUKA (Nippon Rational Inc.)
+#
+
+require 'e2mmap'
+require 'irb/slex'
+
+require 'rdoc/code_objects'
+require 'rdoc/tokenstream'
+require 'rdoc/markup/preprocess'
+require 'rdoc/parser'
+
+$TOKEN_DEBUG ||= nil
+#$TOKEN_DEBUG = $DEBUG_RDOC
+
+##
+# Definitions of all tokens involved in the lexical analysis
+
+module RDoc::RubyToken
+
+  EXPR_BEG   = :EXPR_BEG
+  EXPR_MID   = :EXPR_MID
+  EXPR_END   = :EXPR_END
+  EXPR_ARG   = :EXPR_ARG
+  EXPR_FNAME = :EXPR_FNAME
+  EXPR_DOT   = :EXPR_DOT
+  EXPR_CLASS = :EXPR_CLASS
+
+  class Token
+    NO_TEXT = "??".freeze
+
+    attr_accessor :text
+    attr_reader :line_no
+    attr_reader :char_no
+
+    def initialize(line_no, char_no)
+      @line_no = line_no
+      @char_no = char_no
+      @text    = NO_TEXT
+    end
+
+    def ==(other)
+      self.class == other.class and
+        other.line_no == @line_no and
+        other.char_no == @char_no and
+        other.text == @text
+    end
+
+    ##
+    # Because we're used in contexts that expect to return a token, we set the
+    # text string and then return ourselves
+
+    def set_text(text)
+      @text = text
+      self
+    end
+
+  end
+
+  class TkNode < Token
+    attr :node
+  end
+
+  class TkId < Token
+    def initialize(line_no, char_no, name)
+      super(line_no, char_no)
+      @name = name
+    end
+    attr :name
+  end
+
+  class TkKW < TkId
+  end
+
+  class TkVal < Token
+    def initialize(line_no, char_no, value = nil)
+      super(line_no, char_no)
+      set_text(value)
+    end
+  end
+
+  class TkOp < Token
+    def name
+      self.class.op_name
+    end
+  end
+
+  class TkOPASGN < TkOp
+    def initialize(line_no, char_no, op)
+      super(line_no, char_no)
+      op = TkReading2Token[op] unless Symbol === op
+      @op = op
+    end
+    attr :op
+  end
+
+  class TkUnknownChar < Token
+    def initialize(line_no, char_no, id)
+      super(line_no, char_no)
+      @name = char_no.chr
+    end
+    attr :name
+  end
+
+  class TkError < Token
+  end
+
+  def set_token_position(line, char)
+    @prev_line_no = line
+    @prev_char_no = char
+  end
+
+  def Token(token, value = nil)
+    tk = nil
+    case token
+    when String, Symbol
+      source = String === token ? TkReading2Token : TkSymbol2Token
+      raise TkReading2TokenNoKey, token if (tk = source[token]).nil?
+      tk = Token(tk[0], value)
+    else
+      tk = if (token.ancestors & [TkId, TkVal, TkOPASGN, TkUnknownChar]).empty?
+             token.new(@prev_line_no, @prev_char_no)
+           else
+             token.new(@prev_line_no, @prev_char_no, value)
+           end
+    end
+    tk
+  end
+
+  TokenDefinitions = [
+    [:TkCLASS,      TkKW,  "class",  EXPR_CLASS],
+    [:TkMODULE,     TkKW,  "module", EXPR_BEG],
+    [:TkDEF,        TkKW,  "def",    EXPR_FNAME],
+    [:TkUNDEF,      TkKW,  "undef",  EXPR_FNAME],
+    [:TkBEGIN,      TkKW,  "begin",  EXPR_BEG],
+    [:TkRESCUE,     TkKW,  "rescue", EXPR_MID],
+    [:TkENSURE,     TkKW,  "ensure", EXPR_BEG],
+    [:TkEND,        TkKW,  "end",    EXPR_END],
+    [:TkIF,         TkKW,  "if",     EXPR_BEG, :TkIF_MOD],
+    [:TkUNLESS,     TkKW,  "unless", EXPR_BEG, :TkUNLESS_MOD],
+    [:TkTHEN,       TkKW,  "then",   EXPR_BEG],
+    [:TkELSIF,      TkKW,  "elsif",  EXPR_BEG],
+    [:TkELSE,       TkKW,  "else",   EXPR_BEG],
+    [:TkCASE,       TkKW,  "case",   EXPR_BEG],
+    [:TkWHEN,       TkKW,  "when",   EXPR_BEG],
+    [:TkWHILE,      TkKW,  "while",  EXPR_BEG, :TkWHILE_MOD],
+    [:TkUNTIL,      TkKW,  "until",  EXPR_BEG, :TkUNTIL_MOD],
+    [:TkFOR,        TkKW,  "for",    EXPR_BEG],
+    [:TkBREAK,      TkKW,  "break",  EXPR_END],
+    [:TkNEXT,       TkKW,  "next",   EXPR_END],
+    [:TkREDO,       TkKW,  "redo",   EXPR_END],
+    [:TkRETRY,      TkKW,  "retry",  EXPR_END],
+    [:TkIN,         TkKW,  "in",     EXPR_BEG],
+    [:TkDO,         TkKW,  "do",     EXPR_BEG],
+    [:TkRETURN,     TkKW,  "return", EXPR_MID],
+    [:TkYIELD,      TkKW,  "yield",  EXPR_END],
+    [:TkSUPER,      TkKW,  "super",  EXPR_END],
+    [:TkSELF,       TkKW,  "self",   EXPR_END],
+    [:TkNIL,        TkKW,  "nil",    EXPR_END],
+    [:TkTRUE,       TkKW,  "true",   EXPR_END],
+    [:TkFALSE,      TkKW,  "false",  EXPR_END],
+    [:TkAND,        TkKW,  "and",    EXPR_BEG],
+    [:TkOR,         TkKW,  "or",     EXPR_BEG],
+    [:TkNOT,        TkKW,  "not",    EXPR_BEG],
+    [:TkIF_MOD,     TkKW],
+    [:TkUNLESS_MOD, TkKW],
+    [:TkWHILE_MOD,  TkKW],
+    [:TkUNTIL_MOD,  TkKW],
+    [:TkALIAS,      TkKW,  "alias",    EXPR_FNAME],
+    [:TkDEFINED,    TkKW,  "defined?", EXPR_END],
+    [:TklBEGIN,     TkKW,  "BEGIN",    EXPR_END],
+    [:TklEND,       TkKW,  "END",      EXPR_END],
+    [:Tk__LINE__,   TkKW,  "__LINE__", EXPR_END],
+    [:Tk__FILE__,   TkKW,  "__FILE__", EXPR_END],
+
+    [:TkIDENTIFIER, TkId],
+    [:TkFID,        TkId],
+    [:TkGVAR,       TkId],
+    [:TkIVAR,       TkId],
+    [:TkCONSTANT,   TkId],
+
+    [:TkINTEGER,    TkVal],
+    [:TkFLOAT,      TkVal],
+    [:TkSTRING,     TkVal],
+    [:TkXSTRING,    TkVal],
+    [:TkREGEXP,     TkVal],
+    [:TkCOMMENT,    TkVal],
+
+    [:TkDSTRING,    TkNode],
+    [:TkDXSTRING,   TkNode],
+    [:TkDREGEXP,    TkNode],
+    [:TkNTH_REF,    TkId],
+    [:TkBACK_REF,   TkId],
+
+    [:TkUPLUS,      TkOp,   "+@"],
+    [:TkUMINUS,     TkOp,   "-@"],
+    [:TkPOW,        TkOp,   "**"],
+    [:TkCMP,        TkOp,   "<=>"],
+    [:TkEQ,         TkOp,   "=="],
+    [:TkEQQ,        TkOp,   "==="],
+    [:TkNEQ,        TkOp,   "!="],
+    [:TkGEQ,        TkOp,   ">="],
+    [:TkLEQ,        TkOp,   "<="],
+    [:TkANDOP,      TkOp,   "&&"],
+    [:TkOROP,       TkOp,   "||"],
+    [:TkMATCH,      TkOp,   "=~"],
+    [:TkNMATCH,     TkOp,   "!~"],
+    [:TkDOT2,       TkOp,   ".."],
+    [:TkDOT3,       TkOp,   "..."],
+    [:TkAREF,       TkOp,   "[]"],
+    [:TkASET,       TkOp,   "[]="],
+    [:TkLSHFT,      TkOp,   "<<"],
+    [:TkRSHFT,      TkOp,   ">>"],
+    [:TkCOLON2,     TkOp],
+    [:TkCOLON3,     TkOp],
+#   [:OPASGN,       TkOp],               # +=, -=  etc. #
+    [:TkASSOC,      TkOp,   "=>"],
+    [:TkQUESTION,   TkOp,   "?"],        #?
+    [:TkCOLON,      TkOp,   ":"],        #:
+
+    [:TkfLPAREN],         # func( #
+    [:TkfLBRACK],         # func[ #
+    [:TkfLBRACE],         # func{ #
+    [:TkSTAR],            # *arg
+    [:TkAMPER],           # &arg #
+    [:TkSYMBOL,     TkId],          # :SYMBOL
+    [:TkSYMBEG,     TkId],
+    [:TkGT,         TkOp,   ">"],
+    [:TkLT,         TkOp,   "<"],
+    [:TkPLUS,       TkOp,   "+"],
+    [:TkMINUS,      TkOp,   "-"],
+    [:TkMULT,       TkOp,   "*"],
+    [:TkDIV,        TkOp,   "/"],
+    [:TkMOD,        TkOp,   "%"],
+    [:TkBITOR,      TkOp,   "|"],
+    [:TkBITXOR,     TkOp,   "^"],
+    [:TkBITAND,     TkOp,   "&"],
+    [:TkBITNOT,     TkOp,   "~"],
+    [:TkNOTOP,      TkOp,   "!"],
+
+    [:TkBACKQUOTE,  TkOp,   "`"],
+
+    [:TkASSIGN,     Token,  "="],
+    [:TkDOT,        Token,  "."],
+    [:TkLPAREN,     Token,  "("],  #(exp)
+    [:TkLBRACK,     Token,  "["],  #[arry]
+    [:TkLBRACE,     Token,  "{"],  #{hash}
+    [:TkRPAREN,     Token,  ")"],
+    [:TkRBRACK,     Token,  "]"],
+    [:TkRBRACE,     Token,  "}"],
+    [:TkCOMMA,      Token,  ","],
+    [:TkSEMICOLON,  Token,  ";"],
+
+    [:TkRD_COMMENT],
+    [:TkSPACE],
+    [:TkNL],
+    [:TkEND_OF_SCRIPT],
+
+    [:TkBACKSLASH,  TkUnknownChar,  "\\"],
+    [:TkAT,         TkUnknownChar,  "@"],
+    [:TkDOLLAR,     TkUnknownChar,  "\$"], #"
+  ]
+
+  # {reading => token_class}
+  # {reading => [token_class, *opt]}
+  TkReading2Token = {}
+  TkSymbol2Token = {}
+
+  def self.def_token(token_n, super_token = Token, reading = nil, *opts)
+    token_n = token_n.id2name unless String === token_n
+
+    fail AlreadyDefinedToken, token_n if const_defined?(token_n)
+
+    token_c =  Class.new super_token
+    const_set token_n, token_c
+#    token_c.inspect
+
+    if reading
+      if TkReading2Token[reading]
+        fail TkReading2TokenDuplicateError, token_n, reading
+      end
+      if opts.empty?
+        TkReading2Token[reading] = [token_c]
+      else
+        TkReading2Token[reading] = [token_c].concat(opts)
+      end
+    end
+    TkSymbol2Token[token_n.intern] = token_c
+
+    if token_c <= TkOp
+      token_c.class_eval %{
+        def self.op_name; "#{reading}"; end
+      }
+    end
+  end
+
+  for defs in TokenDefinitions
+    def_token(*defs)
+  end
+
+  NEWLINE_TOKEN = TkNL.new(0,0)
+  NEWLINE_TOKEN.set_text("\n")
+
+end
+
+##
+# Lexical analyzer for Ruby source
+
+class RDoc::RubyLex
+
+  ##
+  # Read an input stream character by character. We allow for unlimited
+  # ungetting of characters just read.
+  #
+  # We simplify the implementation greatly by reading the entire input
+  # into a buffer initially, and then simply traversing it using
+  # pointers.
+  #
+  # We also have to allow for the <i>here document diversion</i>. This
+  # little gem comes about when the lexer encounters a here
+  # document. At this point we effectively need to split the input
+  # stream into two parts: one to read the body of the here document,
+  # the other to read the rest of the input line where the here
+  # document was initially encountered. For example, we might have
+  #
+  #   do_something(<<-A, <<-B)
+  #     stuff
+  #     for
+  #   A
+  #     stuff
+  #     for
+  #   B
+  #
+  # When the lexer encounters the <<A, it reads until the end of the
+  # line, and keeps it around for later. It then reads the body of the
+  # here document.  Once complete, it needs to read the rest of the
+  # original line, but then skip the here document body.
+  #
+
+  class BufferedReader
+
+    attr_reader :line_num
+
+    def initialize(content, options)
+      @options = options
+
+      if /\t/ =~ content
+        tab_width = @options.tab_width
+        content = content.split(/\n/).map do |line|
+          1 while line.gsub!(/\t+/) { ' ' * (tab_width*$&.length - $`.length % tab_width)}  && $~ #`
+          line
+        end .join("\n")
+      end
+      @content   = content
+      @content << "\n" unless @content[-1,1] == "\n"
+      @size      = @content.size
+      @offset    = 0
+      @hwm       = 0
+      @line_num  = 1
+      @read_back_offset = 0
+      @last_newline = 0
+      @newline_pending = false
+    end
+
+    def column
+      @offset - @last_newline
+    end
+
+    def getc
+      return nil if @offset >= @size
+      ch = @content[@offset, 1]
+
+      @offset += 1
+      @hwm = @offset if @hwm < @offset
+
+      if @newline_pending
+        @line_num += 1
+        @last_newline = @offset - 1
+        @newline_pending = false
+      end
+
+      if ch == "\n"
+        @newline_pending = true
+      end
+      ch
+    end
+
+    def getc_already_read
+      getc
+    end
+
+    def ungetc(ch)
+      raise "unget past beginning of file" if @offset <= 0
+      @offset -= 1
+      if @content[@offset] == ?\n
+        @newline_pending = false
+      end
+    end
+
+    def get_read
+      res = @content[@read_back_offset...@offset]
+      @read_back_offset = @offset
+      res
+    end
+
+    def peek(at)
+      pos = @offset + at
+      if pos >= @size
+        nil
+      else
+        @content[pos, 1]
+      end
+    end
+
+    def peek_equal(str)
+      @content[@offset, str.length] == str
+    end
+
+    def divert_read_from(reserve)
+      @content[@offset, 0] = reserve
+      @size      = @content.size
+    end
+  end
+
+  # end of nested class BufferedReader
+
+  extend Exception2MessageMapper
+  def_exception(:AlreadyDefinedToken, "Already defined token(%s)")
+  def_exception(:TkReading2TokenNoKey, "key nothing(key='%s')")
+  def_exception(:TkSymbol2TokenNoKey, "key nothing(key='%s')")
+  def_exception(:TkReading2TokenDuplicateError,
+                "key duplicate(token_n='%s', key='%s')")
+  def_exception(:SyntaxError, "%s")
+
+  include RDoc::RubyToken
+  include IRB
+
+  attr_reader :continue
+  attr_reader :lex_state
+
+  def self.debug?
+    false
+  end
+
+  def initialize(content, options)
+    lex_init
+
+    @options = options
+
+    @reader = BufferedReader.new content, @options
+
+    @exp_line_no = @line_no = 1
+    @base_char_no = 0
+    @indent = 0
+
+    @ltype = nil
+    @quoted = nil
+    @lex_state = EXPR_BEG
+    @space_seen = false
+
+    @continue = false
+    @line = ""
+
+    @skip_space = false
+    @read_auto_clean_up = false
+    @exception_on_syntax_error = true
+  end
+
+  attr_accessor :skip_space
+  attr_accessor :read_auto_clean_up
+  attr_accessor :exception_on_syntax_error
+  attr_reader :indent
+
+  # io functions
+  def line_no
+    @reader.line_num
+  end
+
+  def char_no
+    @reader.column
+  end
+
+  def get_read
+    @reader.get_read
+  end
+
+  def getc
+    @reader.getc
+  end
+
+  def getc_of_rests
+    @reader.getc_already_read
+  end
+
+  def gets
+    c = getc or return
+    l = ""
+    begin
+      l.concat c unless c == "\r"
+      break if c == "\n"
+    end while c = getc
+    l
+  end
+
+
+  def ungetc(c = nil)
+    @reader.ungetc(c)
+  end
+
+  def peek_equal?(str)
+    @reader.peek_equal(str)
+  end
+
+  def peek(i = 0)
+    @reader.peek(i)
+  end
+
+  def lex
+    until (TkNL === (tk = token) or TkEND_OF_SCRIPT === tk) and
+           not @continue or tk.nil?
+    end
+
+    line = get_read
+
+    if line == "" and TkEND_OF_SCRIPT === tk or tk.nil? then
+      nil
+    else
+      line
+    end
+  end
+
+  def token
+    set_token_position(line_no, char_no)
+    begin
+      begin
+        tk = @OP.match(self)
+        @space_seen = TkSPACE === tk
+      rescue SyntaxError
+        abort if @exception_on_syntax_error
+        tk = TkError.new(line_no, char_no)
+      end
+    end while @skip_space and TkSPACE === tk
+    if @read_auto_clean_up
+      get_read
+    end
+#   throw :eof unless tk
+    tk
+  end
+
+  ENINDENT_CLAUSE = [
+    "case", "class", "def", "do", "for", "if",
+    "module", "unless", "until", "while", "begin" #, "when"
+  ]
+  DEINDENT_CLAUSE = ["end" #, "when"
+  ]
+
+  PERCENT_LTYPE = {
+    "q" => "\'",
+    "Q" => "\"",
+    "x" => "\`",
+    "r" => "/",
+    "w" => "]"
+  }
+
+  PERCENT_PAREN = {
+    "{" => "}",
+    "[" => "]",
+    "<" => ">",
+    "(" => ")"
+  }
+
+  Ltype2Token = {
+    "\'" => TkSTRING,
+    "\"" => TkSTRING,
+    "\`" => TkXSTRING,
+    "/" => TkREGEXP,
+    "]" => TkDSTRING
+  }
+  Ltype2Token.default = TkSTRING
+
+  DLtype2Token = {
+    "\"" => TkDSTRING,
+    "\`" => TkDXSTRING,
+    "/" => TkDREGEXP,
+  }
+
+  def lex_init()
+    @OP = IRB::SLex.new
+    @OP.def_rules("\0", "\004", "\032") do |chars, io|
+      Token(TkEND_OF_SCRIPT).set_text(chars)
+    end
+
+    @OP.def_rules(" ", "\t", "\f", "\r", "\13") do |chars, io|
+      @space_seen = TRUE
+      while (ch = getc) =~ /[ \t\f\r\13]/
+        chars << ch
+      end
+      ungetc
+      Token(TkSPACE).set_text(chars)
+    end
+
+    @OP.def_rule("#") do
+      |op, io|
+      identify_comment
+    end
+
+    @OP.def_rule("=begin", proc{@prev_char_no == 0 && peek(0) =~ /\s/}) do
+      |op, io|
+      str = op
+      @ltype = "="
+
+
+      begin
+        line = ""
+        begin
+          ch = getc
+          line << ch
+        end until ch == "\n"
+        str << line
+      end until line =~ /^=end/
+
+      ungetc
+
+      @ltype = nil
+
+      if str =~ /\A=begin\s+rdoc/i
+        str.sub!(/\A=begin.*\n/, '')
+        str.sub!(/^=end.*/m, '')
+        Token(TkCOMMENT).set_text(str)
+      else
+        Token(TkRD_COMMENT)#.set_text(str)
+      end
+    end
+
+    @OP.def_rule("\n") do
+      print "\\n\n" if RDoc::RubyLex.debug?
+      case @lex_state
+      when EXPR_BEG, EXPR_FNAME, EXPR_DOT
+        @continue = TRUE
+      else
+        @continue = FALSE
+        @lex_state = EXPR_BEG
+      end
+      Token(TkNL).set_text("\n")
+    end
+
+    @OP.def_rules("*", "**",
+                  "!", "!=", "!~",
+                  "=", "==", "===",
+                  "=~", "<=>",
+                  "<", "<=",
+                  ">", ">=", ">>") do
+      |op, io|
+      @lex_state = EXPR_BEG
+      Token(op).set_text(op)
+    end
+
+    @OP.def_rules("<<") do
+      |op, io|
+      tk = nil
+      if @lex_state != EXPR_END && @lex_state != EXPR_CLASS &&
+        (@lex_state != EXPR_ARG || @space_seen)
+        c = peek(0)
+        if /[-\w_\"\'\`]/ =~ c
+          tk = identify_here_document
+        end
+      end
+      if !tk
+        @lex_state = EXPR_BEG
+        tk = Token(op).set_text(op)
+      end
+      tk
+    end
+
+    @OP.def_rules("'", '"') do
+      |op, io|
+      identify_string(op)
+    end
+
+    @OP.def_rules("`") do
+      |op, io|
+      if @lex_state == EXPR_FNAME
+        Token(op).set_text(op)
+      else
+        identify_string(op)
+      end
+    end
+
+    @OP.def_rules('?') do
+      |op, io|
+      if @lex_state == EXPR_END
+        @lex_state = EXPR_BEG
+        Token(TkQUESTION).set_text(op)
+      else
+        ch = getc
+        if @lex_state == EXPR_ARG && ch !~ /\s/
+          ungetc
+          @lex_state = EXPR_BEG
+          Token(TkQUESTION).set_text(op)
+        else
+          str = op
+          str << ch
+          if (ch == '\\') #'
+            str << read_escape
+          end
+          @lex_state = EXPR_END
+          Token(TkINTEGER).set_text(str)
+        end
+      end
+    end
+
+    @OP.def_rules("&", "&&", "|", "||") do
+      |op, io|
+      @lex_state = EXPR_BEG
+      Token(op).set_text(op)
+    end
+
+    @OP.def_rules("+=", "-=", "*=", "**=",
+                  "&=", "|=", "^=", "<<=", ">>=", "||=", "&&=") do
+      |op, io|
+      @lex_state = EXPR_BEG
+      op =~ /^(.*)=$/
+      Token(TkOPASGN, $1).set_text(op)
+    end
+
+    @OP.def_rule("+@", proc{@lex_state == EXPR_FNAME}) do |op, io|
+      Token(TkUPLUS).set_text(op)
+    end
+
+    @OP.def_rule("-@", proc{@lex_state == EXPR_FNAME}) do |op, io|
+      Token(TkUMINUS).set_text(op)
+    end
+
+    @OP.def_rules("+", "-") do
+      |op, io|
+      catch(:RET) do
+        if @lex_state == EXPR_ARG
+          if @space_seen and peek(0) =~ /[0-9]/
+            throw :RET, identify_number(op)
+          else
+            @lex_state = EXPR_BEG
+          end
+        elsif @lex_state != EXPR_END and peek(0) =~ /[0-9]/
+          throw :RET, identify_number(op)
+        else
+          @lex_state = EXPR_BEG
+        end
+        Token(op).set_text(op)
+      end
+    end
+
+    @OP.def_rule(".") do
+      @lex_state = EXPR_BEG
+      if peek(0) =~ /[0-9]/
+        ungetc
+        identify_number("")
+      else
+        # for obj.if
+        @lex_state = EXPR_DOT
+        Token(TkDOT).set_text(".")
+      end
+    end
+
+    @OP.def_rules("..", "...") do
+      |op, io|
+      @lex_state = EXPR_BEG
+      Token(op).set_text(op)
+    end
+
+    lex_int2
+  end
+
+  def lex_int2
+    @OP.def_rules("]", "}", ")") do
+      |op, io|
+      @lex_state = EXPR_END
+      @indent -= 1
+      Token(op).set_text(op)
+    end
+
+    @OP.def_rule(":") do
+      if @lex_state == EXPR_END || peek(0) =~ /\s/
+        @lex_state = EXPR_BEG
+        tk = Token(TkCOLON)
+      else
+        @lex_state = EXPR_FNAME
+        tk = Token(TkSYMBEG)
+      end
+      tk.set_text(":")
+    end
+
+    @OP.def_rule("::") do
+      if @lex_state == EXPR_BEG or @lex_state == EXPR_ARG && @space_seen
+        @lex_state = EXPR_BEG
+        tk = Token(TkCOLON3)
+      else
+        @lex_state = EXPR_DOT
+        tk = Token(TkCOLON2)
+      end
+      tk.set_text("::")
+    end
+
+    @OP.def_rule("/") do
+      |op, io|
+      if @lex_state == EXPR_BEG || @lex_state == EXPR_MID
+        identify_string(op)
+      elsif peek(0) == '='
+        getc
+        @lex_state = EXPR_BEG
+        Token(TkOPASGN, :/).set_text("/=") #")
+      elsif @lex_state == EXPR_ARG and @space_seen and peek(0) !~ /\s/
+        identify_string(op)
+      else
+        @lex_state = EXPR_BEG
+        Token("/").set_text(op)
+      end
+    end
+
+    @OP.def_rules("^") do
+      @lex_state = EXPR_BEG
+      Token("^").set_text("^")
+    end
+
+    @OP.def_rules(",", ";") do
+      |op, io|
+      @lex_state = EXPR_BEG
+      Token(op).set_text(op)
+    end
+
+    @OP.def_rule("~") do
+      @lex_state = EXPR_BEG
+      Token("~").set_text("~")
+    end
+
+    @OP.def_rule("~@", proc{@lex_state = EXPR_FNAME}) do
+      @lex_state = EXPR_BEG
+      Token("~").set_text("~@")
+    end
+
+    @OP.def_rule("(") do
+      @indent += 1
+      if @lex_state == EXPR_BEG || @lex_state == EXPR_MID
+        @lex_state = EXPR_BEG
+        tk = Token(TkfLPAREN)
+      else
+        @lex_state = EXPR_BEG
+        tk = Token(TkLPAREN)
+      end
+      tk.set_text("(")
+    end
+
+    @OP.def_rule("[]", proc{@lex_state == EXPR_FNAME}) do
+      Token("[]").set_text("[]")
+    end
+
+    @OP.def_rule("[]=", proc{@lex_state == EXPR_FNAME}) do
+      Token("[]=").set_text("[]=")
+    end
+
+    @OP.def_rule("[") do
+      @indent += 1
+      if @lex_state == EXPR_FNAME
+        t = Token(TkfLBRACK)
+      else
+        if @lex_state == EXPR_BEG || @lex_state == EXPR_MID
+          t = Token(TkLBRACK)
+        elsif @lex_state == EXPR_ARG && @space_seen
+          t = Token(TkLBRACK)
+        else
+          t = Token(TkfLBRACK)
+        end
+        @lex_state = EXPR_BEG
+      end
+      t.set_text("[")
+    end
+
+    @OP.def_rule("{") do
+      @indent += 1
+      if @lex_state != EXPR_END && @lex_state != EXPR_ARG
+        t = Token(TkLBRACE)
+      else
+        t = Token(TkfLBRACE)
+      end
+      @lex_state = EXPR_BEG
+      t.set_text("{")
+    end
+
+    @OP.def_rule('\\') do   #'
+      if getc == "\n"
+        @space_seen = true
+        @continue = true
+        Token(TkSPACE).set_text("\\\n")
+      else
+        ungetc
+        Token("\\").set_text("\\")  #"
+      end
+    end
+
+    @OP.def_rule('%') do
+      |op, io|
+      if @lex_state == EXPR_BEG || @lex_state == EXPR_MID
+        identify_quotation('%')
+      elsif peek(0) == '='
+        getc
+        Token(TkOPASGN, "%").set_text("%=")
+      elsif @lex_state == EXPR_ARG and @space_seen and peek(0) !~ /\s/
+        identify_quotation('%')
+      else
+        @lex_state = EXPR_BEG
+        Token("%").set_text("%")
+      end
+    end
+
+    @OP.def_rule('$') do  #'
+      identify_gvar
+    end
+
+    @OP.def_rule('@') do
+      if peek(0) =~ /[@\w_]/
+        ungetc
+        identify_identifier
+      else
+        Token("@").set_text("@")
+      end
+    end
+
+    @OP.def_rule("__END__", proc{@prev_char_no == 0 && peek(0) =~ /[\r\n]/}) do
+      throw :eof
+    end
+
+    @OP.def_rule("") do
+      |op, io|
+      printf "MATCH: start %s: %s\n", op, io.inspect if RDoc::RubyLex.debug?
+      if peek(0) =~ /[0-9]/
+        t = identify_number("")
+      elsif peek(0) =~ /[\w_]/
+        t = identify_identifier
+      end
+      printf "MATCH: end %s: %s\n", op, io.inspect if RDoc::RubyLex.debug?
+      t
+    end
+  end
+
+  def identify_gvar
+    @lex_state = EXPR_END
+    str = "$"
+
+    tk = case ch = getc
+         when /[~_*$?!@\/\\;,=:<>".]/   #"
+           str << ch
+           Token(TkGVAR, str)
+
+         when "-"
+           str << "-" << getc
+           Token(TkGVAR, str)
+
+         when "&", "`", "'", "+"
+           str << ch
+           Token(TkBACK_REF, str)
+
+         when /[1-9]/
+           str << ch
+           while (ch = getc) =~ /[0-9]/
+             str << ch
+           end
+           ungetc
+           Token(TkNTH_REF)
+         when /\w/
+           ungetc
+           ungetc
+           return identify_identifier
+         else
+           ungetc
+           Token("$")
+         end
+    tk.set_text(str)
+  end
+
+  def identify_identifier
+    token = ""
+    token.concat getc if peek(0) =~ /[$@]/
+    token.concat getc if peek(0) == "@"
+
+    while (ch = getc) =~ /\w|_/
+      print ":", ch, ":" if RDoc::RubyLex.debug?
+      token.concat ch
+    end
+    ungetc
+
+    if ch == "!" or ch == "?"
+      token.concat getc
+    end
+    # fix token
+
+    # $stderr.puts "identifier - #{token}, state = #@lex_state"
+
+    case token
+    when /^\$/
+      return Token(TkGVAR, token).set_text(token)
+    when /^\@/
+      @lex_state = EXPR_END
+      return Token(TkIVAR, token).set_text(token)
+    end
+
+    if @lex_state != EXPR_DOT
+      print token, "\n" if RDoc::RubyLex.debug?
+
+      token_c, *trans = TkReading2Token[token]
+      if token_c
+        # reserved word?
+
+        if (@lex_state != EXPR_BEG &&
+            @lex_state != EXPR_FNAME &&
+            trans[1])
+          # modifiers
+          token_c = TkSymbol2Token[trans[1]]
+          @lex_state = trans[0]
+        else
+          if @lex_state != EXPR_FNAME
+            if ENINDENT_CLAUSE.include?(token)
+              @indent += 1
+            elsif DEINDENT_CLAUSE.include?(token)
+              @indent -= 1
+            end
+            @lex_state = trans[0]
+          else
+            @lex_state = EXPR_END
+          end
+        end
+        return Token(token_c, token).set_text(token)
+      end
+    end
+
+    if @lex_state == EXPR_FNAME
+      @lex_state = EXPR_END
+      if peek(0) == '='
+        token.concat getc
+      end
+    elsif @lex_state == EXPR_BEG || @lex_state == EXPR_DOT
+      @lex_state = EXPR_ARG
+    else
+      @lex_state = EXPR_END
+    end
+
+    if token[0, 1] =~ /[A-Z]/
+      return Token(TkCONSTANT, token).set_text(token)
+    elsif token[token.size - 1, 1] =~ /[!?]/
+      return Token(TkFID, token).set_text(token)
+    else
+      return Token(TkIDENTIFIER, token).set_text(token)
+    end
+  end
+
+  def identify_here_document
+    ch = getc
+    if ch == "-"
+      ch = getc
+      indent = true
+    end
+    if /['"`]/ =~ ch            # '
+      lt = ch
+      quoted = ""
+      while (c = getc) && c != lt
+        quoted.concat c
+      end
+    else
+      lt = '"'
+      quoted = ch.dup
+      while (c = getc) && c =~ /\w/
+        quoted.concat c
+      end
+      ungetc
+    end
+
+    ltback, @ltype = @ltype, lt
+    reserve = ""
+
+    while ch = getc
+      reserve << ch
+      if ch == "\\"    #"
+        ch = getc
+        reserve << ch
+      elsif ch == "\n"
+        break
+      end
+    end
+
+    str = ""
+    while (l = gets)
+      l.chomp!
+      l.strip! if indent
+      break if l == quoted
+      str << l.chomp << "\n"
+    end
+
+    @reader.divert_read_from(reserve)
+
+    @ltype = ltback
+    @lex_state = EXPR_END
+    Token(Ltype2Token[lt], str).set_text(str.dump)
+  end
+
+  def identify_quotation(initial_char)
+    ch = getc
+    if lt = PERCENT_LTYPE[ch]
+      initial_char += ch
+      ch = getc
+    elsif ch =~ /\W/
+      lt = "\""
+    else
+      fail SyntaxError, "unknown type of %string ('#{ch}')"
+    end
+#     if ch !~ /\W/
+#       ungetc
+#       next
+#     end
+    #@ltype = lt
+    @quoted = ch unless @quoted = PERCENT_PAREN[ch]
+    identify_string(lt, @quoted, ch, initial_char)
+  end
+
+  def identify_number(start)
+    str = start.dup
+
+    if start == "+" or start == "-" or start == ""
+      start = getc
+      str << start
+    end
+
+    @lex_state = EXPR_END
+
+    if start == "0"
+      if peek(0) == "x"
+        ch = getc
+        str << ch
+        match = /[0-9a-f_]/
+      else
+        match = /[0-7_]/
+      end
+      while ch = getc
+        if ch !~ match
+          ungetc
+          break
+        else
+          str << ch
+        end
+      end
+      return Token(TkINTEGER).set_text(str)
+    end
+
+    type = TkINTEGER
+    allow_point = TRUE
+    allow_e = TRUE
+    while ch = getc
+      case ch
+      when /[0-9_]/
+        str << ch
+
+      when allow_point && "."
+        type = TkFLOAT
+        if peek(0) !~ /[0-9]/
+          ungetc
+          break
+        end
+        str << ch
+        allow_point = false
+
+      when allow_e && "e", allow_e && "E"
+        str << ch
+        type = TkFLOAT
+        if peek(0) =~ /[+-]/
+          str << getc
+        end
+        allow_e = false
+        allow_point = false
+      else
+        ungetc
+        break
+      end
+    end
+    Token(type).set_text(str)
+  end
+
+  def identify_string(ltype, quoted = ltype, opener=nil, initial_char = nil)
+    @ltype = ltype
+    @quoted = quoted
+    subtype = nil
+
+    str = ""
+    str << initial_char if initial_char
+    str << (opener||quoted)
+
+    nest = 0
+    begin
+      while ch = getc
+        str << ch
+        if @quoted == ch
+          if nest == 0
+            break
+          else
+            nest -= 1
+          end
+        elsif opener == ch
+          nest += 1
+        elsif @ltype != "'" && @ltype != "]" and ch == "#"
+          ch = getc
+          if ch == "{"
+            subtype = true
+            str << ch << skip_inner_expression
+          else
+            ungetc(ch)
+          end
+        elsif ch == '\\' #'
+          str << read_escape
+        end
+      end
+      if @ltype == "/"
+        if peek(0) =~ /i|o|n|e|s/
+          str << getc
+        end
+      end
+      if subtype
+        Token(DLtype2Token[ltype], str)
+      else
+        Token(Ltype2Token[ltype], str)
+      end.set_text(str)
+    ensure
+      @ltype = nil
+      @quoted = nil
+      @lex_state = EXPR_END
+    end
+  end
+
+  def skip_inner_expression
+    res = ""
+    nest = 0
+    while (ch = getc)
+      res << ch
+      if ch == '}'
+        break if nest.zero?
+        nest -= 1
+      elsif ch == '{'
+        nest += 1
+      end
+    end
+    res
+  end
+
+  def identify_comment
+    @ltype = "#"
+    comment = "#"
+    while ch = getc
+      if ch == "\\"
+        ch = getc
+        if ch == "\n"
+          ch = " "
+        else
+          comment << "\\"
+        end
+      else
+        if ch == "\n"
+          @ltype = nil
+          ungetc
+          break
+        end
+      end
+      comment << ch
+    end
+    return Token(TkCOMMENT).set_text(comment)
+  end
+
+  def read_escape
+    res = ""
+    case ch = getc
+    when /[0-7]/
+      ungetc ch
+      3.times do
+        case ch = getc
+        when /[0-7]/
+        when nil
+          break
+        else
+          ungetc
+          break
+        end
+        res << ch
+      end
+
+    when "x"
+      res << ch
+      2.times do
+        case ch = getc
+        when /[0-9a-fA-F]/
+        when nil
+          break
+        else
+          ungetc
+          break
+        end
+        res << ch
+      end
+
+    when "M"
+      res << ch
+      if (ch = getc) != '-'
+        ungetc
+      else
+        res << ch
+        if (ch = getc) == "\\" #"
+          res << ch
+          res << read_escape
+        else
+          res << ch
+        end
+      end
+
+    when "C", "c" #, "^"
+      res << ch
+      if ch == "C" and (ch = getc) != "-"
+        ungetc
+      else
+        res << ch
+        if (ch = getc) == "\\" #"
+          res << ch
+          res << read_escape
+        else
+          res << ch
+        end
+      end
+    else
+      res << ch
+    end
+    res
+  end
+end
+
+##
+# Extracts code elements from a source file returning a TopLevel object
+# containing the constituent file elements.
+#
+# This file is based on rtags
+#
+# RubyParser understands how to document:
+# * classes
+# * modules
+# * methods
+# * constants
+# * aliases
+# * private, public, protected
+# * private_class_function, public_class_function
+# * module_function
+# * attr, attr_reader, attr_writer, attr_accessor
+# * extra accessors given on the command line
+# * metaprogrammed methods
+# * require
+# * include
+#
+# == Method Arguments
+#
+#--
+# NOTE: I don't think this works, needs tests, remove the paragraph following
+# this block when known to work
+#
+# The parser extracts the arguments from the method definition.  You can
+# override this with a custom argument definition using the :args: directive:
+#
+#   ##
+#   # This method tries over and over until it is tired
+#   
+#   def go_go_go(thing_to_try, tries = 10) # :args: thing_to_try
+#     puts thing_to_try
+#     go_go_go thing_to_try, tries - 1
+#   end
+#
+# If you have a more-complex set of overrides you can use the :call-seq:
+# directive:
+#++
+#
+# The parser extracts the arguments from the method definition.  You can
+# override this with a custom argument definition using the :call-seq:
+# directive:
+#
+#   ##
+#   # This method can be called with a range or an offset and length
+#   #
+#   # :call-seq:
+#   #   my_method(Range)
+#   #   my_method(offset, length)
+#   
+#   def my_method(*args)
+#   end
+#
+# The parser extracts +yield+ expressions from method bodies to gather the
+# yielded argument names.  If your method manually calls a block instead of
+# yielding or you want to override the discovered argument names use
+# the :yields: directive:
+#
+#   ##
+#   # My method is awesome
+#   
+#   def my_method(&block) # :yields: happy, times
+#     block.call 1, 2
+#   end
+#
+# == Metaprogrammed Methods
+#
+# To pick up a metaprogrammed method, the parser looks for a comment starting
+# with '##' before an identifier:
+#
+#   ##
+#   # This is a meta-programmed method!
+#   
+#   add_my_method :meta_method, :arg1, :arg2
+#
+# The parser looks at the token after the identifier to determine the name, in
+# this example, :meta_method.  If a name cannot be found, a warning is printed
+# and 'unknown is used.
+#
+# You can force the name of a method using the :method: directive:
+#
+#   ##
+#   # :method: woo_hoo!
+#
+# By default, meta-methods are instance methods.  To indicate that a method is
+# a singleton method instead use the :singleton-method: directive:
+#
+#   ##
+#   # :singleton-method:
+#
+# You can also use the :singleton-method: directive with a name:
+#
+#   ##
+#   # :singleton-method: woo_hoo!
+#
+# == Hidden methods
+#
+# You can provide documentation for methods that don't appear using
+# the :method: and :singleton-method: directives:
+#
+#   ##
+#   # :method: ghost_method
+#   # There is a method here, but you can't see it!
+#   
+#   ##
+#   # this is a comment for a regular method
+#   
+#   def regular_method() end
+#
+# Note that by default, the :method: directive will be ignored if there is a
+# standard rdocable item following it.
+
+class RDoc::Parser::Ruby < RDoc::Parser
+
+  parse_files_matching(/\.rbw?$/)
+
+  include RDoc::RubyToken
+  include RDoc::TokenStream
+
+  NORMAL = "::"
+  SINGLE = "<<"
+
+  def initialize(top_level, file_name, content, options, stats)
+    super
+
+    @size = 0
+    @token_listeners = nil
+    @scanner = RDoc::RubyLex.new content, @options
+    @scanner.exception_on_syntax_error = false
+
+    reset
+  end
+
+  def add_token_listener(obj)
+    @token_listeners ||= []
+    @token_listeners << obj
+  end
+
+  ##
+  # Look for the first comment in a file that isn't a shebang line.
+
+  def collect_first_comment
+    skip_tkspace
+    res = ''
+    first_line = true
+
+    tk = get_tk
+
+    while TkCOMMENT === tk
+      if first_line and tk.text =~ /\A#!/ then
+        skip_tkspace
+        tk = get_tk
+      elsif first_line and tk.text =~ /\A#\s*-\*-/ then
+        first_line = false
+        skip_tkspace
+        tk = get_tk
+      else
+        first_line = false
+        res << tk.text << "\n"
+        tk = get_tk
+
+        if TkNL === tk then
+          skip_tkspace false
+          tk = get_tk
+        end
+      end
+    end
+
+    unget_tk tk
+
+    res
+  end
+
+  def error(msg)
+    msg = make_message msg
+    $stderr.puts msg
+    exit(1)
+  end
+
+  ##
+  # Look for a 'call-seq' in the comment, and override the normal parameter
+  # stuff
+
+  def extract_call_seq(comment, meth)
+    if comment.sub!(/:?call-seq:(.*?)^\s*\#?\s*$/m, '') then
+      seq = $1
+      seq.gsub!(/^\s*\#\s*/, '')
+      meth.call_seq = seq
+    end
+
+    meth
+  end
+
+  def get_bool
+    skip_tkspace
+    tk = get_tk
+    case tk
+    when TkTRUE
+      true
+    when TkFALSE, TkNIL
+      false
+    else
+      unget_tk tk
+      true
+    end
+  end
+
+  ##
+  # Look for the name of a class of module (optionally with a leading :: or
+  # with :: separated named) and return the ultimate name and container
+
+  def get_class_or_module(container)
+    skip_tkspace
+    name_t = get_tk
+
+    # class ::A -> A is in the top level
+    if TkCOLON2 === name_t then
+      name_t = get_tk
+      container = @top_level
+    end
+
+    skip_tkspace(false)
+
+    while TkCOLON2 === peek_tk do
+      prev_container = container
+      container = container.find_module_named(name_t.name)
+      if !container
+#          warn("Couldn't find module #{name_t.name}")
+        container = prev_container.add_module RDoc::NormalModule, name_t.name
+      end
+      get_tk
+      name_t = get_tk
+    end
+    skip_tkspace(false)
+    return [container, name_t]
+  end
+
+  ##
+  # Return a superclass, which can be either a constant of an expression
+
+  def get_class_specification
+    tk = get_tk
+    return "self" if TkSELF === tk
+
+    res = ""
+    while TkCOLON2 === tk or TkCOLON3 === tk or TkCONSTANT === tk do
+      res += tk.text
+      tk = get_tk
+    end
+
+    unget_tk(tk)
+    skip_tkspace(false)
+
+    get_tkread # empty out read buffer
+
+    tk = get_tk
+
+    case tk
+    when TkNL, TkCOMMENT, TkSEMICOLON then
+      unget_tk(tk)
+      return res
+    end
+
+    res += parse_call_parameters(tk)
+    res
+  end
+
+  ##
+  # Parse a constant, which might be qualified by one or more class or module
+  # names
+
+  def get_constant
+    res = ""
+    skip_tkspace(false)
+    tk = get_tk
+
+    while TkCOLON2 === tk or TkCOLON3 === tk or TkCONSTANT === tk do
+      res += tk.text
+      tk = get_tk
+    end
+
+#      if res.empty?
+#        warn("Unexpected token #{tk} in constant")
+#      end
+    unget_tk(tk)
+    res
+  end
+
+  ##
+  # Get a constant that may be surrounded by parens
+
+  def get_constant_with_optional_parens
+    skip_tkspace(false)
+    nest = 0
+    while TkLPAREN === (tk = peek_tk) or TkfLPAREN === tk do
+      get_tk
+      skip_tkspace(true)
+      nest += 1
+    end
+
+    name = get_constant
+
+    while nest > 0
+      skip_tkspace(true)
+      tk = get_tk
+      nest -= 1 if TkRPAREN === tk
+    end
+    name
+  end
+
+  def get_symbol_or_name
+    tk = get_tk
+    case tk
+    when  TkSYMBOL
+      tk.text.sub(/^:/, '')
+    when TkId, TkOp
+      tk.name
+    when TkSTRING
+      tk.text
+    else
+      raise "Name or symbol expected (got #{tk})"
+    end
+  end
+
+  def get_tk
+    tk = nil
+    if @tokens.empty?
+      tk = @scanner.token
+      @read.push @scanner.get_read
+      puts "get_tk1 => #{tk.inspect}" if $TOKEN_DEBUG
+    else
+      @read.push @unget_read.shift
+      tk = @tokens.shift
+      puts "get_tk2 => #{tk.inspect}" if $TOKEN_DEBUG
+    end
+
+    if TkSYMBEG === tk then
+      set_token_position(tk.line_no, tk.char_no)
+      tk1 = get_tk
+      if TkId === tk1 or TkOp === tk1 or TkSTRING === tk1 then
+        if tk1.respond_to?(:name)
+          tk = Token(TkSYMBOL).set_text(":" + tk1.name)
+        else
+          tk = Token(TkSYMBOL).set_text(":" + tk1.text)
+        end
+        # remove the identifier we just read (we're about to
+        # replace it with a symbol)
+        @token_listeners.each do |obj|
+          obj.pop_token
+        end if @token_listeners
+      else
+        warn("':' not followed by identifier or operator")
+        tk = tk1
+      end
+    end
+
+    # inform any listeners of our shiny new token
+    @token_listeners.each do |obj|
+      obj.add_token(tk)
+    end if @token_listeners
+
+    tk
+  end
+
+  def get_tkread
+    read = @read.join("")
+    @read = []
+    read
+  end
+
+  ##
+  # Look for directives in a normal comment block:
+  #
+  #   #-- - don't display comment from this point forward
+  #
+  # This routine modifies it's parameter
+
+  def look_for_directives_in(context, comment)
+    preprocess = RDoc::Markup::PreProcess.new(@file_name,
+                                              @options.rdoc_include)
+
+    preprocess.handle(comment) do |directive, param|
+      case directive
+      when 'enddoc' then
+        throw :enddoc
+      when 'main' then
+        @options.main_page = param
+        ''
+      when 'method', 'singleton-method' then
+        false # ignore
+      when 'section' then
+        context.set_current_section(param, comment)
+        comment.replace ''
+        break
+      when 'startdoc' then
+        context.start_doc
+        context.force_documentation = true
+        ''
+      when 'stopdoc' then
+        context.stop_doc
+        ''
+      when 'title' then
+        @options.title = param
+        ''
+      else
+        warn "Unrecognized directive '#{directive}'"
+        false
+      end
+    end
+
+    remove_private_comments(comment)
+  end
+
+  def make_message(msg)
+    prefix = "\n" + @file_name + ":"
+    if @scanner
+      prefix << "#{@scanner.line_no}:#{@scanner.char_no}: "
+    end
+    return prefix + msg
+  end
+
+  def parse_attr(context, single, tk, comment)
+    args = parse_symbol_arg(1)
+    if args.size > 0
+      name = args[0]
+      rw = "R"
+      skip_tkspace(false)
+      tk = get_tk
+      if TkCOMMA === tk then
+        rw = "RW" if get_bool
+      else
+        unget_tk tk
+      end
+      att = RDoc::Attr.new get_tkread, name, rw, comment
+      read_documentation_modifiers att, RDoc::ATTR_MODIFIERS
+      if att.document_self
+        context.add_attribute(att)
+      end
+    else
+      warn("'attr' ignored - looks like a variable")
+    end
+  end
+
+  def parse_attr_accessor(context, single, tk, comment)
+    args = parse_symbol_arg
+    read = get_tkread
+    rw = "?"
+
+    # If nodoc is given, don't document any of them
+
+    tmp = RDoc::CodeObject.new
+    read_documentation_modifiers tmp, RDoc::ATTR_MODIFIERS
+    return unless tmp.document_self
+
+    case tk.name
+    when "attr_reader"   then rw = "R"
+    when "attr_writer"   then rw = "W"
+    when "attr_accessor" then rw = "RW"
+    else
+      rw = @options.extra_accessor_flags[tk.name]
+      rw = '?' if rw.nil?
+    end
+
+    for name in args
+      att = RDoc::Attr.new get_tkread, name, rw, comment
+      context.add_attribute att
+    end
+  end
+
+  def parse_alias(context, single, tk, comment)
+    skip_tkspace
+    if TkLPAREN === peek_tk then
+      get_tk
+      skip_tkspace
+    end
+    new_name = get_symbol_or_name
+    @scanner.instance_eval{@lex_state = EXPR_FNAME}
+    skip_tkspace
+    if TkCOMMA === peek_tk then
+      get_tk
+      skip_tkspace
+    end
+    old_name = get_symbol_or_name
+
+    al = RDoc::Alias.new get_tkread, old_name, new_name, comment
+    read_documentation_modifiers al, RDoc::ATTR_MODIFIERS
+    if al.document_self
+      context.add_alias(al)
+    end
+  end
+
+  def parse_call_parameters(tk)
+    end_token = case tk
+                when TkLPAREN, TkfLPAREN
+                  TkRPAREN
+                when TkRPAREN
+                  return ""
+                else
+                  TkNL
+                end
+    nest = 0
+
+    loop do
+      puts("Call param: #{tk}, #{@scanner.continue} " +
+        "#{@scanner.lex_state} #{nest}") if $DEBUG_RDOC
+        case tk
+        when TkSEMICOLON
+          break
+        when TkLPAREN, TkfLPAREN
+          nest += 1
+        when end_token
+          if end_token == TkRPAREN
+            nest -= 1
+            break if @scanner.lex_state == EXPR_END and nest <= 0
+          else
+            break unless @scanner.continue
+          end
+        when TkCOMMENT
+          unget_tk(tk)
+          break
+        end
+        tk = get_tk
+    end
+    res = get_tkread.tr("\n", " ").strip
+    res = "" if res == ";"
+    res
+  end
+
+  def parse_class(container, single, tk, comment, &block)
+    progress("c")
+
+    @stats.num_classes += 1
+
+    container, name_t = get_class_or_module(container)
+
+    case name_t
+    when TkCONSTANT
+      name = name_t.name
+      superclass = "Object"
+
+      if TkLT === peek_tk then
+        get_tk
+        skip_tkspace(true)
+        superclass = get_class_specification
+        superclass = "<unknown>" if superclass.empty?
+      end
+
+      if single == SINGLE
+        cls_type = RDoc::SingleClass
+      else
+        cls_type = RDoc::NormalClass
+      end
+
+      cls = container.add_class cls_type, name, superclass
+      read_documentation_modifiers cls, RDoc::CLASS_MODIFIERS
+      cls.record_location(@top_level)
+      parse_statements(cls)
+      cls.comment = comment
+
+    when TkLSHFT
+      case name = get_class_specification
+      when "self", container.name
+        parse_statements(container, SINGLE, &block)
+      else
+        other = RDoc::TopLevel.find_class_named(name)
+        unless other
+          #            other = @top_level.add_class(NormalClass, name, nil)
+          #            other.record_location(@top_level)
+          #            other.comment = comment
+          other = RDoc::NormalClass.new "Dummy", nil
+        end
+        read_documentation_modifiers other, RDoc::CLASS_MODIFIERS
+        parse_statements(other, SINGLE, &block)
+      end
+
+    else
+      warn("Expected class name or '<<'. Got #{name_t.class}: #{name_t.text.inspect}")
+    end
+  end
+
+  def parse_constant(container, single, tk, comment)
+    name = tk.name
+    skip_tkspace(false)
+    eq_tk = get_tk
+
+    unless TkASSIGN === eq_tk then
+      unget_tk(eq_tk)
+      return
+    end
+
+
+    nest = 0
+    get_tkread
+
+    tk = get_tk
+    if TkGT === tk then
+      unget_tk(tk)
+      unget_tk(eq_tk)
+      return
+    end
+
+    loop do
+      puts "Param: %p, %s %s %s" %
+        [tk.text, @scanner.continue, @scanner.lex_state, nest] if $DEBUG_RDOC
+
+        case tk
+        when TkSEMICOLON
+          break
+        when TkLPAREN, TkfLPAREN
+          nest += 1
+        when TkRPAREN
+          nest -= 1
+        when TkCOMMENT
+          if nest <= 0 && @scanner.lex_state == EXPR_END
+            unget_tk(tk)
+            break
+          end
+        when TkNL
+          if (@scanner.lex_state == EXPR_END and nest <= 0) || [email protected]
+            unget_tk(tk)
+            break
+          end
+        end
+        tk = get_tk
+    end
+
+    res = get_tkread.tr("\n", " ").strip
+    res = "" if res == ";"
+
+    con = RDoc::Constant.new name, res, comment
+    read_documentation_modifiers con, RDoc::CONSTANT_MODIFIERS
+
+    if con.document_self
+      container.add_constant(con)
+    end
+  end
+
+  def parse_comment(container, tk, comment)
+    progress(".")
+    @stats.num_methods += 1
+    line_no = tk.line_no
+    column  = tk.char_no
+
+    singleton = !!comment.sub!(/(^# +:?)(singleton-)(method:)/, '\1\3')
+
+    if comment.sub!(/^# +:?method: *(\S*).*?\n/i, '') then
+      name = $1 unless $1.empty?
+    else
+      return nil
+    end
+
+    meth = RDoc::GhostMethod.new get_tkread, name
+    meth.singleton = singleton
+
+    meth.start_collecting_tokens
+    indent = TkSPACE.new 1, 1
+    indent.set_text " " * column
+
+    position_comment = TkCOMMENT.new(line_no, 1, "# File #{@top_level.file_absolute_name}, line #{line_no}")
+    meth.add_tokens [position_comment, NEWLINE_TOKEN, indent]
+
+    meth.params = ''
+
+    extract_call_seq comment, meth
+
+    container.add_method meth if meth.document_self
+
+    meth.comment = comment
+  end
+
+  def parse_include(context, comment)
+    loop do
+      skip_tkspace_comment
+
+      name = get_constant_with_optional_parens
+      context.add_include RDoc::Include.new(name, comment) unless name.empty?
+
+      return unless TkCOMMA === peek_tk
+      get_tk
+    end
+  end
+
+  ##
+  # Parses a meta-programmed method
+
+  def parse_meta_method(container, single, tk, comment)
+    progress(".")
+    @stats.num_methods += 1
+    line_no = tk.line_no
+    column  = tk.char_no
+
+    start_collecting_tokens
+    add_token tk
+    add_token_listener self
+
+    skip_tkspace false
+
+    singleton = !!comment.sub!(/(^# +:?)(singleton-)(method:)/, '\1\3')
+
+    if comment.sub!(/^# +:?method: *(\S*).*?\n/i, '') then
+      name = $1 unless $1.empty?
+    end
+
+    if name.nil? then
+      name_t = get_tk
+      case name_t
+      when TkSYMBOL then
+        name = name_t.text[1..-1]
+      when TkSTRING then
+        name = name_t.text[1..-2]
+      else
+        warn "#{container.top_level.file_relative_name}:#{name_t.line_no} unknown name token #{name_t.inspect} for meta-method"
+        name = 'unknown'
+      end
+    end
+
+    meth = RDoc::MetaMethod.new get_tkread, name
+    meth.singleton = singleton
+
+    remove_token_listener self
+
+    meth.start_collecting_tokens
+    indent = TkSPACE.new 1, 1
+    indent.set_text " " * column
+
+    position_comment = TkCOMMENT.new(line_no, 1, "# File #{@top_level.file_absolute_name}, line #{line_no}")
+    meth.add_tokens [position_comment, NEWLINE_TOKEN, indent]
+    meth.add_tokens @token_stream
+
+    add_token_listener meth
+
+    meth.params = ''
+
+    extract_call_seq comment, meth
+
+    container.add_method meth if meth.document_self
+
+    last_tk = tk
+
+    while tk = get_tk do
+      case tk
+      when TkSEMICOLON then
+        break
+      when TkNL then
+        break unless last_tk and TkCOMMA === last_tk
+      when TkSPACE then
+        # expression continues
+      else
+        last_tk = tk
+      end
+    end
+
+    remove_token_listener meth
+
+    meth.comment = comment
+  end
+
+  ##
+  # Parses a method
+
+  def parse_method(container, single, tk, comment)
+    progress(".")
+    @stats.num_methods += 1
+    line_no = tk.line_no
+    column  = tk.char_no
+
+    start_collecting_tokens
+    add_token(tk)
+    add_token_listener(self)
+
+    @scanner.instance_eval do @lex_state = EXPR_FNAME end
+
+    skip_tkspace(false)
+    name_t = get_tk
+    back_tk = skip_tkspace
+    meth = nil
+    added_container = false
+
+    dot = get_tk
+    if TkDOT === dot or TkCOLON2 === dot then
+      @scanner.instance_eval do @lex_state = EXPR_FNAME end
+      skip_tkspace
+      name_t2 = get_tk
+
+      case name_t
+      when TkSELF then
+        name = name_t2.name
+      when TkCONSTANT then
+        name = name_t2.name
+        prev_container = container
+        container = container.find_module_named(name_t.name)
+        unless container then
+          added_container = true
+          obj = name_t.name.split("::").inject(Object) do |state, item|
+            state.const_get(item)
+          end rescue nil
+
+          type = obj.class == Class ? RDoc::NormalClass : RDoc::NormalModule
+
+          unless [Class, Module].include?(obj.class) then
+            warn("Couldn't find #{name_t.name}. Assuming it's a module")
+          end
+
+          if type == RDoc::NormalClass then
+            container = prev_container.add_class(type, name_t.name, obj.superclass.name)
+          else
+            container = prev_container.add_module(type, name_t.name)
+          end
+
+          container.record_location @top_level
+        end
+      else
+        # warn("Unexpected token '#{name_t2.inspect}'")
+        # break
+        skip_method(container)
+        return
+      end
+
+      meth = RDoc::AnyMethod.new(get_tkread, name)
+      meth.singleton = true
+    else
+      unget_tk dot
+      back_tk.reverse_each do |token|
+        unget_tk token
+      end
+      name = name_t.name
+
+      meth = RDoc::AnyMethod.new get_tkread, name
+      meth.singleton = (single == SINGLE)
+    end
+
+    remove_token_listener self
+
+    meth.start_collecting_tokens
+    indent = TkSPACE.new 1, 1
+    indent.set_text " " * column
+
+    token = TkCOMMENT.new(line_no, 1, "# File #{@top_level.file_absolute_name}, line #{line_no}")
+    meth.add_tokens [token, NEWLINE_TOKEN, indent]
+    meth.add_tokens @token_stream
+
+    add_token_listener meth
+
+    @scanner.instance_eval do @continue = false end
+    parse_method_parameters meth
+
+    if meth.document_self then
+      container.add_method meth
+    elsif added_container then
+      container.document_self = false
+    end
+
+    # Having now read the method parameters and documentation modifiers, we
+    # now know whether we have to rename #initialize to ::new
+
+    if name == "initialize" && !meth.singleton then
+      if meth.dont_rename_initialize then
+        meth.visibility = :protected
+      else
+        meth.singleton = true
+        meth.name = "new"
+        meth.visibility = :public
+      end
+    end
+
+    parse_statements(container, single, meth)
+
+    remove_token_listener(meth)
+
+    extract_call_seq comment, meth
+
+    meth.comment = comment
+  end
+
+  def parse_method_or_yield_parameters(method = nil,
+                                       modifiers = RDoc::METHOD_MODIFIERS)
+    skip_tkspace(false)
+    tk = get_tk
+
+    # Little hack going on here. In the statement
+    #  f = 2*(1+yield)
+    # We see the RPAREN as the next token, so we need
+    # to exit early. This still won't catch all cases
+    # (such as "a = yield + 1"
+    end_token = case tk
+                when TkLPAREN, TkfLPAREN
+                  TkRPAREN
+                when TkRPAREN
+                  return ""
+                else
+                  TkNL
+                end
+    nest = 0
+
+    loop do
+      puts "Param: %p, %s %s %s" %
+        [tk.text, @scanner.continue, @scanner.lex_state, nest] if $DEBUG_RDOC
+        case tk
+        when TkSEMICOLON
+          break
+        when TkLBRACE
+          nest += 1
+        when TkRBRACE
+          # we might have a.each {|i| yield i }
+          unget_tk(tk) if nest.zero?
+          nest -= 1
+          break if nest <= 0
+        when TkLPAREN, TkfLPAREN
+          nest += 1
+        when end_token
+          if end_token == TkRPAREN
+            nest -= 1
+            break if @scanner.lex_state == EXPR_END and nest <= 0
+          else
+            break unless @scanner.continue
+          end
+        when method && method.block_params.nil? && TkCOMMENT
+          unget_tk(tk)
+          read_documentation_modifiers(method, modifiers)
+        end
+      tk = get_tk
+    end
+    res = get_tkread.tr("\n", " ").strip
+    res = "" if res == ";"
+    res
+  end
+
+  ##
+  # Capture the method's parameters. Along the way, look for a comment
+  # containing:
+  #
+  #    # yields: ....
+  #
+  # and add this as the block_params for the method
+
+  def parse_method_parameters(method)
+    res = parse_method_or_yield_parameters(method)
+    res = "(" + res + ")" unless res[0] == ?(
+    method.params = res unless method.params
+    if method.block_params.nil?
+      skip_tkspace(false)
+      read_documentation_modifiers method, RDoc::METHOD_MODIFIERS
+    end
+  end
+
+  def parse_module(container, single, tk, comment)
+    progress("m")
+    @stats.num_modules += 1
+    container, name_t = get_class_or_module(container)
+#      skip_tkspace
+    name = name_t.name
+
+    mod = container.add_module RDoc::NormalModule, name
+    mod.record_location @top_level
+    read_documentation_modifiers mod, RDoc::CLASS_MODIFIERS
+    parse_statements(mod)
+    mod.comment = comment
+  end
+
+  def parse_require(context, comment)
+    skip_tkspace_comment
+    tk = get_tk
+    if TkLPAREN === tk then
+      skip_tkspace_comment
+      tk = get_tk
+    end
+
+    name = nil
+    case tk
+    when TkSTRING
+      name = tk.text
+      #    when TkCONSTANT, TkIDENTIFIER, TkIVAR, TkGVAR
+      #      name = tk.name
+    when TkDSTRING
+      warn "Skipping require of dynamic string: #{tk.text}"
+      #   else
+      #     warn "'require' used as variable"
+    end
+    if name
+      context.add_require RDoc::Require.new(name, comment)
+    else
+      unget_tk(tk)
+    end
+  end
+
+  def parse_statements(container, single = NORMAL, current_method = nil,
+                       comment = '')
+    nest = 1
+    save_visibility = container.visibility
+
+    non_comment_seen = true
+
+    while tk = get_tk do
+      keep_comment = false
+
+      non_comment_seen = true unless TkCOMMENT === tk
+
+      case tk
+      when TkNL then
+        skip_tkspace true # Skip blanks and newlines
+        tk = get_tk
+
+        if TkCOMMENT === tk then
+          if non_comment_seen then
+            # Look for RDoc in a comment about to be thrown away
+            parse_comment container, tk, comment unless comment.empty?
+
+            comment = ''
+            non_comment_seen = false
+          end
+
+          while TkCOMMENT === tk do
+            comment << tk.text << "\n"
+            tk = get_tk          # this is the newline
+            skip_tkspace(false)  # leading spaces
+            tk = get_tk
+          end
+
+          unless comment.empty? then
+            look_for_directives_in container, comment
+
+            if container.done_documenting then
+              container.ongoing_visibility = save_visibility
+            end
+          end
+
+          keep_comment = true
+        else
+          non_comment_seen = true
+        end
+
+        unget_tk tk
+        keep_comment = true
+
+      when TkCLASS then
+        if container.document_children then
+          parse_class container, single, tk, comment
+        else
+          nest += 1
+        end
+
+      when TkMODULE then
+        if container.document_children then
+          parse_module container, single, tk, comment
+        else
+          nest += 1
+        end
+
+      when TkDEF then
+        if container.document_self then
+          parse_method container, single, tk, comment
+        else
+          nest += 1
+        end
+
+      when TkCONSTANT then
+        if container.document_self then
+          parse_constant container, single, tk, comment
+        end
+
+      when TkALIAS then
+        if container.document_self then
+          parse_alias container, single, tk, comment
+        end
+
+      when TkYIELD then
+        if current_method.nil? then
+          warn "Warning: yield outside of method" if container.document_self
+        else
+          parse_yield container, single, tk, current_method
+        end
+
+      # Until and While can have a 'do', which shouldn't increase the nesting.
+      # We can't solve the general case, but we can handle most occurrences by
+      # ignoring a do at the end of a line.
+
+      when  TkUNTIL, TkWHILE then
+        nest += 1
+        puts "Found #{tk.class} in #{container.name}, nest = #{nest}, " +
+             "line #{tk.line_no}" if $DEBUG_RDOC
+        skip_optional_do_after_expression
+
+      # 'for' is trickier
+      when TkFOR then
+        nest += 1
+        puts "Found #{tk.class} in #{container.name}, nest = #{nest}, " +
+             "line #{tk.line_no}" if $DEBUG_RDOC
+        skip_for_variable
+        skip_optional_do_after_expression
+
+      when TkCASE, TkDO, TkIF, TkUNLESS, TkBEGIN then
+        nest += 1
+        puts "Found #{tk.class} in #{container.name}, nest = #{nest}, " +
+             "line #{tk.line_no}" if $DEBUG_RDOC
+
+      when TkIDENTIFIER then
+        if nest == 1 and current_method.nil? then
+          case tk.name
+          when 'private', 'protected', 'public', 'private_class_method',
+               'public_class_method', 'module_function' then
+            parse_visibility container, single, tk
+            keep_comment = true
+          when 'attr' then
+            parse_attr container, single, tk, comment
+          when /^attr_(reader|writer|accessor)$/, @options.extra_accessors then
+            parse_attr_accessor container, single, tk, comment
+          when 'alias_method' then
+            if container.document_self then
+              parse_alias container, single, tk, comment
+            end
+          else
+            if container.document_self and comment =~ /\A#\#$/ then
+              parse_meta_method container, single, tk, comment
+            end
+          end
+        end
+
+        case tk.name
+        when "require" then
+          parse_require container, comment
+        when "include" then
+          parse_include container, comment
+        end
+
+      when TkEND then
+        nest -= 1
+        puts "Found 'end' in #{container.name}, nest = #{nest}, line #{tk.line_no}" if $DEBUG_RDOC
+        puts "Method = #{current_method.name}" if $DEBUG_RDOC and current_method
+        if nest == 0 then
+          read_documentation_modifiers container, RDoc::CLASS_MODIFIERS
+          container.ongoing_visibility = save_visibility
+          return
+        end
+
+      end
+
+      comment = '' unless keep_comment
+
+      begin
+        get_tkread
+        skip_tkspace(false)
+      end while peek_tk == TkNL
+    end
+  end
+
+  def parse_symbol_arg(no = nil)
+    args = []
+    skip_tkspace_comment
+    case tk = get_tk
+    when TkLPAREN
+      loop do
+        skip_tkspace_comment
+        if tk1 = parse_symbol_in_arg
+          args.push tk1
+          break if no and args.size >= no
+        end
+
+        skip_tkspace_comment
+        case tk2 = get_tk
+        when TkRPAREN
+          break
+        when TkCOMMA
+        else
+          warn("unexpected token: '#{tk2.inspect}'") if $DEBUG_RDOC
+          break
+        end
+      end
+    else
+      unget_tk tk
+      if tk = parse_symbol_in_arg
+        args.push tk
+        return args if no and args.size >= no
+      end
+
+      loop do
+        skip_tkspace(false)
+
+        tk1 = get_tk
+        unless TkCOMMA === tk1 then
+          unget_tk tk1
+          break
+        end
+
+        skip_tkspace_comment
+        if tk = parse_symbol_in_arg
+          args.push tk
+          break if no and args.size >= no
+        end
+      end
+    end
+    args
+  end
+
+  def parse_symbol_in_arg
+    case tk = get_tk
+    when TkSYMBOL
+      tk.text.sub(/^:/, '')
+    when TkSTRING
+      eval @read[-1]
+    else
+      warn("Expected symbol or string, got #{tk.inspect}") if $DEBUG_RDOC
+      nil
+    end
+  end
+
+  def parse_toplevel_statements(container)
+    comment = collect_first_comment
+    look_for_directives_in(container, comment)
+    container.comment = comment unless comment.empty?
+    parse_statements container, NORMAL, nil, comment
+  end
+
+  def parse_visibility(container, single, tk)
+    singleton = (single == SINGLE)
+
+    vis_type = tk.name
+
+    vis = case vis_type
+          when 'private'   then :private
+          when 'protected' then :protected
+          when 'public'    then :public
+          when 'private_class_method' then
+            singleton = true
+            :private
+          when 'public_class_method' then
+            singleton = true
+            :public
+          when 'module_function' then
+            singleton = true
+            :public
+          else
+            raise "Invalid visibility: #{tk.name}"
+          end
+
+    skip_tkspace_comment false
+
+    case peek_tk
+      # Ryan Davis suggested the extension to ignore modifiers, because he
+      # often writes
+      #
+      #   protected unless $TESTING
+      #
+    when TkNL, TkUNLESS_MOD, TkIF_MOD, TkSEMICOLON then
+      container.ongoing_visibility = vis
+    else
+      if vis_type == 'module_function' then
+        args = parse_symbol_arg
+        container.set_visibility_for args, :private, false
+
+        module_functions = []
+
+        container.methods_matching args do |m|
+          s_m = m.dup
+          s_m.singleton = true if RDoc::AnyMethod === s_m
+          s_m.visibility = :public
+          module_functions << s_m
+        end
+
+        module_functions.each do |s_m|
+          case s_m
+          when RDoc::AnyMethod then
+            container.add_method s_m
+          when RDoc::Attr then
+            container.add_attribute s_m
+          end
+        end
+      else
+        args = parse_symbol_arg
+        container.set_visibility_for args, vis, singleton
+      end
+    end
+  end
+
+  def parse_yield_parameters
+    parse_method_or_yield_parameters
+  end
+
+  def parse_yield(context, single, tk, method)
+    if method.block_params.nil?
+      get_tkread
+      @scanner.instance_eval{@continue = false}
+      method.block_params = parse_yield_parameters
+    end
+  end
+
+  def peek_read
+    @read.join('')
+  end
+
+  ##
+  # Peek at the next token, but don't remove it from the stream
+
+  def peek_tk
+    unget_tk(tk = get_tk)
+    tk
+  end
+
+  def progress(char)
+    unless @options.quiet
+      @progress.print(char)
+      @progress.flush
+    end
+  end
+
+  ##
+  # Directives are modifier comments that can appear after class, module, or
+  # method names. For example:
+  #
+  #   def fred # :yields: a, b
+  #
+  # or:
+  #
+  #   class MyClass # :nodoc:
+  #
+  # We return the directive name and any parameters as a two element array
+
+  def read_directive(allowed)
+    tk = get_tk
+    puts "directive: #{tk.text.inspect}" if $DEBUG_RDOC
+    result = nil
+    if TkCOMMENT === tk
+      if tk.text =~ /\s*:?(\w+):\s*(.*)/
+        directive = $1.downcase
+        if allowed.include?(directive)
+          result = [directive, $2]
+        end
+      end
+    else
+      unget_tk(tk)
+    end
+    result
+  end
+
+  def read_documentation_modifiers(context, allow)
+    dir = read_directive(allow)
+
+    case dir[0]
+    when "notnew", "not_new", "not-new" then
+      context.dont_rename_initialize = true
+
+    when "nodoc" then
+      context.document_self = false
+      if dir[1].downcase == "all"
+        context.document_children = false
+      end
+
+    when "doc" then
+      context.document_self = true
+      context.force_documentation = true
+
+    when "yield", "yields" then
+      unless context.params.nil?
+        context.params.sub!(/(,|)\s*&\w+/,'') # remove parameter &proc
+      end
+
+      context.block_params = dir[1]
+
+    when "arg", "args" then
+      context.params = dir[1]
+    end if dir
+  end
+
+  def remove_private_comments(comment)
+    comment.gsub!(/^#--.*?^#\+\+/m, '')
+    comment.sub!(/^#--.*/m, '')
+  end
+
+  def remove_token_listener(obj)
+    @token_listeners.delete(obj)
+  end
+
+  def reset
+    @tokens = []
+    @unget_read = []
+    @read = []
+  end
+
+  def scan
+    reset
+
+    catch(:eof) do
+      catch(:enddoc) do
+        begin
+          parse_toplevel_statements(@top_level)
+        rescue Exception => e
+          $stderr.puts <<-EOF
+
+
+RDoc failure in #{@file_name} at or around line #{@scanner.line_no} column
+#{@scanner.char_no}
+
+Before reporting this, could you check that the file you're documenting
+compiles cleanly--RDoc is not a full Ruby parser, and gets confused easily if
+fed invalid programs.
+
+The internal error was:
+
+          EOF
+
+          e.set_backtrace(e.backtrace[0,4])
+          raise
+        end
+      end
+    end
+
+    @top_level
+  end
+
+  ##
+  # while, until, and for have an optional do
+
+  def skip_optional_do_after_expression
+    skip_tkspace(false)
+    tk = get_tk
+    case tk
+    when TkLPAREN, TkfLPAREN
+      end_token = TkRPAREN
+    else
+      end_token = TkNL
+    end
+
+    nest = 0
+    @scanner.instance_eval{@continue = false}
+
+    loop do
+      puts("\nWhile: #{tk.text.inspect}, #{@scanner.continue} " \
+           "#{@scanner.lex_state} #{nest}") if $DEBUG_RDOC
+      case tk
+      when TkSEMICOLON
+        break
+      when TkLPAREN, TkfLPAREN
+        nest += 1
+      when TkDO
+        break if nest.zero?
+      when end_token
+        if end_token == TkRPAREN
+          nest -= 1
+          break if @scanner.lex_state == EXPR_END and nest.zero?
+        else
+          break unless @scanner.continue
+        end
+      end
+      tk = get_tk
+    end
+    skip_tkspace(false)
+
+    get_tk if TkDO === peek_tk
+  end
+
+  ##
+  # skip the var [in] part of a 'for' statement
+
+  def skip_for_variable
+    skip_tkspace(false)
+    tk = get_tk
+    skip_tkspace(false)
+    tk = get_tk
+    unget_tk(tk) unless TkIN === tk
+  end
+
+  def skip_method(container)
+    meth = RDoc::AnyMethod.new "", "anon"
+    parse_method_parameters(meth)
+    parse_statements(container, false, meth)
+  end
+
+  ##
+  # Skip spaces
+
+  def skip_tkspace(skip_nl = true)
+    tokens = []
+
+    while TkSPACE === (tk = get_tk) or (skip_nl and TkNL === tk) do
+      tokens.push tk
+    end
+
+    unget_tk(tk)
+    tokens
+  end
+
+  ##
+  # Skip spaces until a comment is found
+
+  def skip_tkspace_comment(skip_nl = true)
+    loop do
+      skip_tkspace(skip_nl)
+      return unless TkCOMMENT === peek_tk
+      get_tk
+    end
+  end
+
+  def unget_tk(tk)
+    @tokens.unshift tk
+    @unget_read.unshift @read.pop
+
+    # Remove this token from any listeners
+    @token_listeners.each do |obj|
+      obj.pop_token
+    end if @token_listeners
+  end
+
+  def warn(msg)
+    return if @options.quiet
+    msg = make_message msg
+    $stderr.puts msg
+  end
+
+end
+