Module: AsciidocBib::ProcessorUtils

Included in:
Processor
Defined in:
lib/asciidoc-bib/processorutils.rb

Instance Method Summary collapse

Instance Method Details

#combine_consecutive_numbers(str) ⇒ Object

Used with numeric styles to combine consecutive numbers into ranges

combine_consecutive_numbers("1,2,3")            # -> "1-3"
combine_consecutive_numbers("1,2,3,6,7,8,9,12") # -> "1-3,6-9,12"

Leaves references with page numbers alone.



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# File 'lib/asciidoc-bib/processorutils.rb', line 12

def combine_consecutive_numbers str
  nums = str.split(",").collect(&:strip)
  res = ""
  # Loop through ranges
  start_range = 0
  while start_range < nums.length do
    end_range = start_range
    while (end_range < nums.length-1 and
           nums[end_range].is_i? and
           nums[end_range+1].is_i? and
           nums[end_range+1].to_i == nums[end_range].to_i + 1) do
      end_range += 1
    end
    if end_range - start_range >= 2
      res += "#{nums[start_range]}-#{nums[end_range]}, "
    else
      start_range.upto(end_range) do |i|
        res += "#{nums[i]}, "
      end
    end
    start_range = end_range + 1
  end
  # finish by removing last comma
  res.gsub(/, $/, '')
end