Class: REXML::IOSource

Class | REXML::IOSource
In: | rexml/source.rb
Parent: | Source

A Source that wraps an IO. See the Source class for method documentation

### Methods

consume current_line empty? match new position read scan

### Public Class methods

new(arg, block_size=500)

block_size has been deprecated

[Source]

    # File rexml/source.rb, line 120
                    def initialize(arg, block_size=500)
                            @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.
          str = @source.read( 2 )
          if (str[0] == 254 && str[1] == 255) || (str[0] == 255 && str[1] == 254)
            @encoding = check_encoding( str )
            @line_break = encode( '>' )
          else
            @line_break = '>'
          end
          super str+@source.readline( @line_break )
                    end

### Public Instance methods

consume( pattern )

[Source]

    # File rexml/source.rb, line 175
                    def consume( pattern )
                            match( pattern, true )
                    end

current_line()

@return the current line in the source

[Source]

    # File rexml/source.rb, line 206
                    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

empty?()

[Source]

    # File rexml/source.rb, line 197
                    def empty?
                            super and ( @source.nil? || @source.eof? )
                    end

match( pattern, cons=false )

[Source]

    # File rexml/source.rb, line 179
                    def match( pattern, cons=false )
                            rv = pattern.match(@buffer)
                            @buffer = $' if cons and rv
                            while !rv and @source
                                    begin
              str = @source.readline(@line_break)
                                            str = decode(str) if @to_utf and str
                                            @buffer << str
                                            rv = pattern.match(@buffer)
                                            @buffer = $' if cons and rv
                                    rescue
                                            @source = nil
                                    end
                            end
                            rv.taint
                            rv
                    end

position()

[Source]

    # File rexml/source.rb, line 201
        def position
          @er_source.pos
        end

read()

[Source]

    # File rexml/source.rb, line 165
                    def read
                            begin
            str = @source.readline(@line_break)
                                    str = decode(str) if @to_utf and str
                                    @buffer << str
                            rescue Exception, NameError
                                    @source = nil
                            end
                    end

scan(pattern, cons=false)

[Source]

    # File rexml/source.rb, line 140
                    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
                                                    # READLINE OPT
                                                    #str = @source.read(@block_size)
                                                    str = @source.readline(@line_break)
                                                    str = decode(str) if @to_utf and str
                                                    @buffer << str
                                            rescue
                                                    @source = nil
                                            end
                                    end
                                    rv = super
                            end
                            rv.taint
                            rv
                    end

[Validate]