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?? attlistdecl.rb(1.89 KB)
?? attribute.rb(5.39 KB)
?? cdata.rb(1.54 KB)
?? child.rb(2.63 KB)
?? comment.rb(2.14 KB)
?? doctype.rb(6.58 KB)
?? document.rb(8.28 KB)
?? dtd
?? element.rb(43.85 KB)
?? encoding.rb(1.49 KB)
?? entity.rb(5.53 KB)
?? formatters
?? functions.rb(11.27 KB)
?? instruction.rb(2.01 KB)
?? light
?? namespace.rb(1.09 KB)
?? node.rb(2.13 KB)
?? output.rb(392 B)
?? parent.rb(4.33 KB)
?? parseexception.rb(1.22 KB)
?? parsers
?? quickpath.rb(9.08 KB)
?? rexml.rb(1.65 KB)
?? sax2listener.rb(3.6 KB)
?? source.rb(7.29 KB)
?? streamlistener.rb(3.88 KB)
?? syncenumerator.rb(685 B)
?? text.rb(13.57 KB)
?? undefinednamespaceexception.rb(210 B)
?? validation
?? xmldecl.rb(2.78 KB)
?? xmltokens.rb(526 B)
?? xpath.rb(3.31 KB)
?? xpath_parser.rb(25.7 KB)

Editing: source.rb

require 'rexml/encoding'

module REXML
  # Generates Source-s.  USE THIS CLASS.
  class SourceFactory
    # Generates a Source object
    # @param arg Either a String, or an IO
    # @return a Source, or nil if a bad argument was given
    def SourceFactory::create_from(arg)
      if arg.respond_to? :read and
          arg.respond_to? :readline and
          arg.respond_to? :nil? and
          arg.respond_to? :eof?
        IOSource.new(arg)
      elsif arg.respond_to? :to_str
        require 'stringio'
        IOSource.new(StringIO.new(arg))
      elsif arg.kind_of? Source
        arg
      else
        raise "#{arg.class} is not a valid input stream.  It must walk \n"+
          "like either a String, an IO, or a Source."
      end
    end
  end

# A Source can be searched for patterns, and wraps buffers and other
  # objects and provides consumption of text
  class Source
    include Encoding
    # The current buffer (what we're going to read next)
    attr_reader :buffer
    # The line number of the last consumed text
    attr_reader :line
    attr_reader :encoding

# Constructor
    # @param arg must be a String, and should be a valid XML document
    # @param encoding if non-null, sets the encoding of the source to this
    # value, overriding all encoding detection
    def initialize(arg, encoding=nil)
      @orig = @buffer = arg
      if encoding
        self.encoding = encoding
      else
        self.encoding = check_encoding( @buffer )
      end
      @line = 0
    end

# Inherited from Encoding
    # Overridden to support optimized en/decoding
    def encoding=(enc)
      return unless super
      @line_break = encode( '>' )
      if @encoding != 'UTF-8'
        @buffer = decode(@buffer)
        @to_utf = true
      else
        @to_utf = false
        @buffer.force_encoding ::Encoding::UTF_8
      end
    end

# Scans the source for a given pattern.  Note, that this is not your
    # usual scan() method.  For one thing, the pattern argument has some
    # requirements; for another, the source can be consumed.  You can easily
    # confuse this method.  Originally, the patterns were easier
    # to construct and this method more robust, because this method
    # generated search regexes on the fly; however, this was
    # computationally expensive and slowed down the entire REXML package
    # considerably, since this is by far the most commonly called method.
    # @param pattern must be a Regexp, and must be in the form of
    # /^\s*(#{your pattern, with no groups})(.*)/.  The first group
    # will be returned; the second group is used if the consume flag is
    # set.
    # @param consume if true, the pattern returned will be consumed, leaving
    # everything after it in the Source.
    # @return the pattern, if found, or nil if the Source is empty or the
    # pattern is not found.
    def scan(pattern, cons=false)
      return nil if @buffer.nil?
      rv = @buffer.scan(pattern)
      @buffer = $' if cons and rv.size>0
      rv
    end

def read
    end

def consume( pattern )
      @buffer = $' if pattern.match( @buffer )
    end

def match_to( char, pattern )
      return pattern.match(@buffer)
    end

def match_to_consume( char, pattern )
      md = pattern.match(@buffer)
      @buffer = $'
      return md
    end

def match(pattern, cons=false)
      md = pattern.match(@buffer)
      @buffer = $' if cons and md
      return md
    end

# @return true if the Source is exhausted
    def empty?
      @buffer == ""
    end

def position
      @orig.index( @buffer )
    end

# @return the current line in the source
    def current_line
      lines = @orig.split
      res = lines.grep @buffer[0..30]
      res = res[-1] if res.kind_of? Array
      lines.index( res ) if res
    end
  end

# A Source that wraps an IO.  See the Source class for method
  # documentation
  class IOSource < Source
    #attr_reader :block_size

# block_size has been deprecated
    def initialize(arg, block_size=500, encoding=nil)
      @er_source = @source = arg
      @to_utf = false

# Determining the encoding is a deceptively difficult issue to resolve.
      # First, we check the first two bytes for UTF-16.  Then we
      # assume that the encoding is at least ASCII enough for the '>', and
      # we read until we get one of those.  This gives us the XML declaration,
      # if there is one.  If there isn't one, the file MUST be UTF-8, as per
      # the XML spec.  If there is one, we can determine the encoding from
      # it.
      @buffer = ""
      str = @source.read( 2 ) || ''
      if encoding
        self.encoding = encoding
      elsif str[0,2] == "\xfe\xff"
        @line_break = "\000>"
      elsif str[0,2] == "\xff\xfe"
        @line_break = ">\000"
      elsif str[0,2] == "\xef\xbb"
        str += @source.read(1)
        str = '' if (str[2,1] == "\xBF")
        @line_break = ">"
      else
        @line_break = ">"
      end
      super( @source.eof? ? str : str+@source.readline( @line_break ) )

if !@to_utf and
          @buffer.respond_to?(:force_encoding) and
          @source.respond_to?(:external_encoding) and
          @source.external_encoding != ::Encoding::UTF_8
        @force_utf8 = true
      else
        @force_utf8 = false
      end
    end

def scan(pattern, cons=false)
      rv = super
      # You'll notice that this next section is very similar to the same
      # section in match(), but just a liiittle different.  This is
      # because it is a touch faster to do it this way with scan()
      # than the way match() does it; enough faster to warrent duplicating
      # some code
      if rv.size == 0
        until @buffer =~ pattern or @source.nil?
          begin
            @buffer << readline
          rescue Iconv::IllegalSequence
            raise
          rescue
            @source = nil
          end
        end
        rv = super
      end
      rv.taint
      rv
    end

def read
      begin
        @buffer << readline
      rescue Exception, NameError
        @source = nil
      end
    end

def consume( pattern )
      match( pattern, true )
    end

def match( pattern, cons=false )
      rv = pattern.match(@buffer)
      @buffer = $' if cons and rv
      while !rv and @source
        begin
          @buffer << readline
          rv = pattern.match(@buffer)
          @buffer = $' if cons and rv
        rescue
          @source = nil
        end
      end
      rv.taint
      rv
    end

def empty?
      super and ( @source.nil? || @source.eof? )
    end

def position
      @er_source.pos rescue 0
    end

# @return the current line in the source
    def current_line
      begin
        pos = @er_source.pos        # The byte position in the source
        lineno = @er_source.lineno  # The XML < position in the source
        @er_source.rewind
        line = 0                    # The \r\n position in the source
        begin
          while @er_source.pos < pos
            @er_source.readline
            line += 1
          end
        rescue
        end
      rescue IOError
        pos = -1
        line = -1
      end
      [pos, lineno, line]
    end

private
    def readline
      str = @source.readline(@line_break)
      return nil if str.nil?

if @to_utf
        decode(str)
      else
        str.force_encoding(::Encoding::UTF_8) if @force_utf8
        str
      end
    end
  end
end

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Editing: source.rb

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