Class: HostRange

Inherits:
Object
  • Object
show all
Defined in:
lib/host_range.rb

Class Method Summary collapse

Class Method Details

.parse(pattern) ⇒ Object

wrapper returns flattened array



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# File 'lib/host_range.rb', line 5

def self.parse(pattern)
  parseRange(pattern).flatten
end

.parseRange(pattern) ⇒ Object

parse lists [123] or ranges [1-3], recurses until all […] patterns have been subbed (left to right)



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# File 'lib/host_range.rb', line 11

def self.parseRange(pattern)
  string = pattern.dup               # arg is immutable

  ## list like [123] is split into atoms 1,2,3
  if string.sub!(/\[(\w+)\]/, "%s") 
    $1.split(//).map { |n| parseRange(sprintf(string, n)) }

    ## comma-separated list like [01, 03, 09-12]
  elsif string.sub!(/\[([\s\w,-]+)\]/, "%s")
    $1.split(/\s*,\s*/).map do |n| 

      ## range like 09-12
      if n.sub!(/(\w+)-(\w+)/, "%s")
        ($1..$2).map { |o| parseRange(sprintf(string, o)) }

      ## simple string like 01
      else
        parseRange(sprintf(string, n))
      end
    end

    ## simple string with no more patterns to sub
  else
    [string]
  end
end