1 files changed, 67 insertions, 0 deletions

diff --git a/buffer.rb b/buffer.rb
new file mode 100644
index 0000000..006aaf4
--- /dev/null
+++ b/buffer.rb
@@ -0,0 +1,67 @@
+class Buffer
+  def initialize(size)
+    @size = size
+    @buff = []
+    @buff_type = []
+    @current = 0
+    @wrap = false
+    @before = false
+    @after = false
+  end
+  def size()
+    return @buff.length
+  end
+  def maxlen()
+    maxlen = 0
+    @buff.each do |string|
+      if string.length > maxlen
+        maxlen = string.length
+      end
+    end
+    return maxlen
+  end
+
+  def push(string,type=0)
+    if(string.chomp.empty?) then string = " " end
+    string.split( /\r?\n/ ).each do |line|
+      @buff[@current] = line
+      @buff_type[@current] = type
+      if(@size > 0)
+        @current = (1+@current) % @size
+      else
+        @current = 1+@current
+      end
+      if(@current == 0) then @wrap = true end
+    end
+  end
+  def yield(size,offset=0,&block)
+    if(size < 0) then size = 0 end
+    range = Range.new(0,@current-1).to_a
+    if(@wrap)
+      range = Range.new(@current,@size-1).to_a + range
+    end
+    range = range.last(size+offset)[0,size]
+    @before = (size+offset < @buff.length)
+    @after = (offset != 0 and size < @buff.length)
+    if(block)
+      range.each do |i|
+        yield [@buff[i],@buff_type[i]]
+      end
+    else
+      return range.collect{|r| [@buff[r],@buff_type[r]]}
+    end
+  end
+  def has_after?()
+    return @after
+  end
+  def has_before?()
+    return @before
+  end
+  def clear()
+    @current = 0
+    @buff = []
+    @buff_type = []
+  end
+end
+
+