Class: Readorder::Filelist

Inherits:
Object
  • Object
show all
Defined in:
lib/readorder/filelist.rb

Overview

An interator over the contents of a bunch of files or IO objects depending on the initializer.

Defined Under Namespace

Classes: Error

Instance Method Summary collapse

Constructor Details

#initialize(sources = []) ⇒ Filelist

Returns a new instance of Filelist.



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# File 'lib/readorder/filelist.rb', line 9

def initialize( sources = [] )
  @sources = [ sources ].flatten
  @current_source = nil
  @sources.each do |s|
    case s
    when String
      raise Error, "#{s} does not exist" unless File.exist?( s )
      raise Error, "#{s} is not readable" unless File.readable?( s )
    else
      [ :gets, :close ].each do |meth|
        raise Error, "#{s.inspect} does not respond to '#{meth}'" unless s.respond_to? meth
      end
    end
  end
end

Instance Method Details

#current_source ⇒ Object 



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# File 'lib/readorder/filelist.rb', line 25

def current_source
  if not @current_source then 
    cs = @sources.shift
    case cs
    when String
      @current_source = File.open( cs )
    else
      # nil or respond_to? :gets
      @current_source = cs
    end
  end
  return @current_source
end

#each_line ⇒ Object

Iterator yielding the line returned, stopping on no more lines



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# File 'lib/readorder/filelist.rb', line 55

def each_line
  while line = self.gets do
    yield line
  end
end

#gets ⇒ Object

return the next line from the sources, opening a new source if need be



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# File 'lib/readorder/filelist.rb', line 41

def gets
  loop do
    return nil unless self.current_source
    line = self.current_source.gets
    return line if line

    @current_source.close unless @current_source == $stdin
    @current_source = nil
  end
end