lib/rubyXL/objects/reference.rb
module RubyXL
class Reference
ROW_MAX = 1024*1024
COL_MAX = 16393
attr_reader :row_range, :col_range
# RubyXL::Reference.new(row, col)
# RubyXL::Reference.new(row_from, row_to, col_from, col_to)
# RubyXL::Reference.new(reference_string)
# RubyXL::Reference.new(row_from:, row_to:, col_from:, col_to:)
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
def single_cell?
(@row_range.begin == @row_range.end) && (@col_range.begin == @col_range.end)
end
def valid?
!(row_range.begin.negative? || col_range.begin.negative?)
end
def first_row
@row_range.begin
end
def last_row
@row_range.end
end
def first_col
@col_range.begin
end
def last_col
@col_range.end
end
def ==(other)
!other.nil? && (@row_range == other.row_range) && (@col_range == other.col_range)
end
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
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
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
# Converts +row+ and +col+ zero-based indices to Excel-style cell reference
# <0> A...Z, AA...AZ, BA... ...ZZ, AAA... ...AZZ, BAA... ...XFD <16383>
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
# Converts Excel-style cell reference to +row+ and +col+ zero-based indices.
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
end
class Sqref < Array
def initialize(str)
str.split.each { |ref_str| self << RubyXL::Reference.new(ref_str) }
end
def to_s
self.collect{ |ref| ref.to_s }.join(' ')
end
end
end