Module: Roo::Utils

Extended by:
Utils
Included in:
Utils
Defined in:
lib/roo/utils.rb

Constant Summary collapse

LETTERS = 
('A'..'Z').to_a

Instance Method Summary collapse

Instance Method Details

#each_element(path, elements) ⇒ Object

Yield each element of a given type (‘row’, ‘c’, etc.) to caller



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# File 'lib/roo/utils.rb', line 71

def each_element(path, elements)
  Nokogiri::XML::Reader(::File.open(path, 'rb'), nil, nil, Nokogiri::XML::ParseOptions::NOBLANKS).each do |node|
    next unless node.node_type == Nokogiri::XML::Reader::TYPE_ELEMENT && Array(elements).include?(node.name)
    yield Nokogiri::XML(node.outer_xml).root if block_given?
  end
end

#letter_to_number(letters) ⇒ Object 



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# File 'lib/roo/utils.rb', line 42

def letter_to_number(letters)
  @letter_to_number ||= {}
  @letter_to_number[letters] ||= begin
     result = 0

     # :bytes method returns an enumerator in 1.9.3 and an array in 2.0+
     letters.bytes.to_a.map{|b| b > 96 ? b - 96 : b - 64 }.reverse.each_with_index{ |num, i| result += num * 26 ** i }

     result
  end
end

#load_xml(path) ⇒ Object 



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# File 'lib/roo/utils.rb', line 64

def load_xml(path)
  ::File.open(path, 'rb') do |file|
    ::Nokogiri::XML(file)
  end
end

#num_cells_in_range(str) ⇒ Object

Compute upper bound for cells in a given cell range.

Raises:

  • (ArgumentError) 


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# File 'lib/roo/utils.rb', line 55

def num_cells_in_range(str)
  cells = str.split(':')
  return 1 if cells.count == 1
  raise ArgumentError.new("invalid range string: #{str}. Supported range format 'A1:B2'") if cells.count != 2
  x1, y1 = split_coordinate(cells[0])
  x2, y2 = split_coordinate(cells[1])
  (x2 - (x1 - 1)) * (y2 - (y1 - 1))
end

#number_to_letter(num) ⇒ Object

convert a number to something like ‘AB’ (1 => ‘A’, 2 => ‘B’, …)



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# File 'lib/roo/utils.rb', line 31

def number_to_letter(num)
  result = ""

  until num.zero?
    num, index = (num - 1).divmod(26)
    result.prepend(LETTERS[index])
  end

  result
end

#split_coord(s) ⇒ Object 



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# File 'lib/roo/utils.rb', line 20

def split_coord(s)
  if s =~ /([a-zA-Z]+)([0-9]+)/
    letter = Regexp.last_match[1]
    number = Regexp.last_match[2].to_i
  else
    fail ArgumentError
  end
  [letter, number]
end

#split_coordinate(str) ⇒ Object Also known as: ref_to_key 



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# File 'lib/roo/utils.rb', line 7

def split_coordinate(str)
  @split_coordinate ||= {}

  @split_coordinate[str] ||= begin
    letter, number = split_coord(str)
    x = letter_to_number(letter)
    y = number
    [y, x]
  end
end