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File Content: `source.rb`

# coding: US-ASCII
# frozen_string_literal: false
require_relative '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
        detect_encoding
      end
      @line = 0
    end


    # Inherited from Encoding
    # Overridden to support optimized en/decoding
    def encoding=(enc)
      return unless super
      encoding_updated
    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 regexps 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

    private
    def detect_encoding
      buffer_encoding = @buffer.encoding
      detected_encoding = "UTF-8"
      begin
        @buffer.force_encoding("ASCII-8BIT")
        if @buffer[0, 2] == "\xfe\xff"
          @buffer[0, 2] = ""
          detected_encoding = "UTF-16BE"
        elsif @buffer[0, 2] == "\xff\xfe"
          @buffer[0, 2] = ""
          detected_encoding = "UTF-16LE"
        elsif @buffer[0, 3] == "\xef\xbb\xbf"
          @buffer[0, 3] = ""
          detected_encoding = "UTF-8"
        end
      ensure
        @buffer.force_encoding(buffer_encoding)
      end
      self.encoding = detected_encoding
    end

    def encoding_updated
      if @encoding != 'UTF-8'
        @buffer = decode(@buffer)
        @to_utf = true
      else
        @to_utf = false
        @buffer.force_encoding ::Encoding::UTF_8
      end
    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
      @pending_buffer = nil

      if encoding
        super("", encoding)
      else
        super(@source.read(3) || "")
      end

      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 warrant 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 if RUBY_VERSION < '2.7'
      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 if RUBY_VERSION < '2.7'
      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
        @er_source.seek(pos)
      rescue IOError
        pos = -1
        line = -1
      end
      [pos, lineno, line]
    end

    private
    def readline
      str = @source.readline(@line_break)
      if @pending_buffer
        if str.nil?
          str = @pending_buffer
        else
          str = @pending_buffer + str
        end
        @pending_buffer = nil
      end
      return nil if str.nil?

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

    def encoding_updated
      case @encoding
      when "UTF-16BE", "UTF-16LE"
        @source.binmode
        @source.set_encoding(@encoding, @encoding)
      end
      @line_break = encode(">")
      @pending_buffer, @buffer = @buffer, ""
      @pending_buffer.force_encoding(@encoding)
      super
    end
  end
end

Name	Size	Permission
dtd	---	0755
formatters	---	0755
light	---	0755
parsers	---	0755
validation	---	0755
attlistdecl.rb	1970 bytes	0644
attribute.rb	6117 bytes	0644
cdata.rb	1624 bytes	0644
child.rb	2725 bytes	0644
comment.rb	2170 bytes	0644
doctype.rb	8160 bytes	0644
document.rb	9779 bytes	0644
element.rb	45598 bytes	0644
encoding.rb	1183 bytes	0644
entity.rb	5531 bytes	0644
functions.rb	12567 bytes	0644
instruction.rb	2191 bytes	0644
namespace.rb	1436 bytes	0644
node.rb	2236 bytes	0644
output.rb	553 bytes	0644
parent.rb	4375 bytes	0644
parseexception.rb	1283 bytes	0644
quickpath.rb	9341 bytes	0644
rexml.rb	1319 bytes	0644
sax2listener.rb	3693 bytes	0644
security.rb	824 bytes	0644
source.rb	7901 bytes	0644
streamlistener.rb	3932 bytes	0644
text.rb	14212 bytes	0644
undefinednamespaceexception.rb	244 bytes	0644
xmldecl.rb	3019 bytes	0644
xmltokens.rb	2380 bytes	0644
xpath.rb	3501 bytes	0644
xpath_parser.rb	30346 bytes	0644

File Content: source.rb

File Content: `source.rb`