class RubyXL::Reference

# File lib/rubyXL/objects/reference.rb, line 89
def self.ind2ref(row = 0, col = 0)
  str = ''

  loop do
    x = col % 26
    str = ('A'.ord + x).chr + str
    col = (col / 26).floor - 1
    break if col < 0
  end

  str += (row + 1).to_s
end

# File lib/rubyXL/objects/reference.rb, line 12
def initialize(*params)
  row_from = row_to = col_from = col_to = nil

  case params.size
  when 4 then row_from, row_to, col_from, col_to = params
  when 2 then row_from, col_from = params
  when 1 then
    case params.first
    when Hash then
      row_from, row_to, col_from, col_to = params.first.fetch_values(:row_from, :row_to, :col_from, :col_to)
    when String then
      from, to = params[0].split(':')
      row_from, col_from = self.class.ref2ind(from)
      row_to, col_to = self.class.ref2ind(to) unless to.nil?
    else
      raise ArgumentError.new("invalid value for #{self.class}: #{params[0].inspect}") unless params[0].is_a?(String)
    end
  end

  @row_range = Range.new(row_from || 0, row_to || row_from || ROW_MAX)
  @col_range = Range.new(col_from || 0, col_to || col_from || COL_MAX)
end

# File lib/rubyXL/objects/reference.rb, line 103
def self.ref2ind(str)
  return [ -1, -1 ] unless str =~ /\A([A-Z]+)(\d+)\Z/
  [ Regexp.last_match(2).to_i - 1,
    Regexp.last_match(1).each_byte.inject(0) { |col, chr| (col * 26) + (chr - 64) } - 1 ]
end

# File lib/rubyXL/objects/reference.rb, line 59
def ==(other)
  !other.nil? && (@row_range == other.row_range) && (@col_range == other.col_range)
end

# File lib/rubyXL/objects/reference.rb, line 63
def cover?(other)
  !other.nil? && (@row_range.cover?(other.row_range.begin) &&
                  @row_range.cover?(other.row_range.end) &&
                  @col_range.cover?(other.col_range.begin) &&
                  @col_range.cover?(other.col_range.end))
end

# File lib/rubyXL/objects/reference.rb, line 51
def first_col
  @col_range.begin
end

# File lib/rubyXL/objects/reference.rb, line 43
def first_row
  @row_range.begin
end

# File lib/rubyXL/objects/reference.rb, line 79
def inspect
  if single_cell? then
    "#<#{self.class} @row=#{@row_range.begin} @col=#{@col_range.begin}>"
  else
    "#<#{self.class} @row_range=#{@row_range} @col_range=#{@col_range}>"
  end
end

# File lib/rubyXL/objects/reference.rb, line 55
def last_col
  @col_range.end
end

# File lib/rubyXL/objects/reference.rb, line 47
def last_row
  @row_range.end
end

# File lib/rubyXL/objects/reference.rb, line 35
def single_cell?
  (@row_range.begin == @row_range.end) && (@col_range.begin == @col_range.end)
end

# File lib/rubyXL/objects/reference.rb, line 70
def to_s
  if single_cell? then
    self.class.ind2ref(@row_range.begin, @col_range.begin)
  else
    self.class.ind2ref(@row_range.begin, @col_range.begin) + ':' +
                       self.class.ind2ref(@row_range.end, @col_range.end)
  end
end

# File lib/rubyXL/objects/reference.rb, line 39
def valid?
  !(row_range.begin.negative? || col_range.begin.negative?)
end