class RBS::Buffer

def initialize(name:, content:)
  @name = name
  @content = content
end

def inspect
  "#<RBS::Buffer:#{__id__} @name=#{name}, @content=#{content.bytesize} bytes, @lines=#{lines.size} lines,>"
end

def last_position
  content.size
end

def lines
  @lines ||= content.lines
end

def loc_to_pos(loc)
  line, column = loc
  if range = ranges[line - 1]
    range.begin + column
  else
    last_position
  end
end

def pos_to_loc(pos)
  index = ranges.bsearch_index do |range|
    pos < range.end ? true : false
  end
  if index
    [index + 1, pos - ranges[index].begin]
  else
    [ranges.size + 1, 0]
  end
end

def ranges
  @ranges ||=
    begin
      @ranges = []
      offset = 0
      lines.each do |line|
        size = line.size
        range = offset...(offset+size)
        @ranges << range
        offset += size
      end
      if !content.end_with?("\n") && content.size > 0
        @ranges[-1] = @ranges[-1].begin...(@ranges[-1].end+1)
      end
      @ranges
    end
end