buffer.rb

   1 class Buffer
   2   def initialize(size)
   3     @size = size
   4     @buff = []
   5     @buff_type = []
   6     @current = 0
   7     @wrap = false
   8     @before = false
   9     @after = false
  10   end
  11   def size()
  12     return @buff.length
  13   end
  14   def maxlen()
  15     maxlen = 0
  16     @buff.each do |string|
  17       if string.length > maxlen
  18         maxlen = string.length
  19       end
  20     end
  21     return maxlen
  22   end
  23
  24   def push(string,type=0)
  25     if(string.chomp.empty?) then string = " " end
  26     string.split( /\r?\n/ ).each do |line|
  27       @buff[@current] = line
  28       @buff_type[@current] = type
  29       if(@size > 0)
  30         @current = (1+@current) % @size
  31       else
  32         @current = 1+@current
  33       end
  34       if(@current == 0) then @wrap = true end
  35     end
  36   end
  37   def yield(size,offset=0,&block)
  38     if(size < 0) then size = 0 end
  39     range = Range.new(0,@current-1).to_a
  40     if(@wrap)
  41       range = Range.new(@current,@size-1).to_a + range
  42     end
  43     range = range.last(size+offset)[0,size]
  44     @before = (size+offset < @buff.length)
  45     @after = (offset != 0 and size < @buff.length)
  46     if(block)
  47       range.each do |i|
  48         yield [@buff[i],@buff_type[i]]
  49       end
  50     else
  51       return range.collect{|r| [@buff[r],@buff_type[r]]}
  52     end
  53   end
  54   def has_after?()
  55     return @after
  56   end
  57   def has_before?()
  58     return @before
  59   end
  60   def clear()
  61     @current = 0
  62     @buff = []
  63     @buff_type = []
  64   end
  65 end
  66
  67