Class: Numerizer

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

Constant Summary collapse

DIRECT_NUMS =
[
  ['eleven', '11'],
  ['twelve', '12'],
  ['thirteen', '13'],
  ['fourteen', '14'],
  ['fifteen', '15'],
  ['sixteen', '16'],
  ['seventeen', '17'],
  ['eighteen', '18'],
  ['nineteen', '19'],
  ['ninteen', '19'], # Common mis-spelling
  ['zero', '0'],
  ['one', '1'],
  ['two', '2'],
  ['three', '3'],
  ['four(\W|$)', '4\1'],  # The weird regex is so that it matches four but not fourty
  ['five', '5'],
  ['six(\W|$)', '6\1'],
  ['seven(\W|$)', '7\1'],
  ['eight(\W|$)', '8\1'],
  ['nine(\W|$)', '9\1'],
  ['ten', '10'],
  ['\ba[\b^$]', '1'] # doesn't make sense for an 'a' at the end to be a 1
]
TEN_PREFIXES =
[ ['twenty', 20],
  ['thirty', 30],
  ['fourty', 40],
  ['fifty', 50],
  ['sixty', 60],
  ['seventy', 70],
  ['eighty', 80],
  ['ninety', 90]
]
BIG_PREFIXES =
[ ['hundred', 100],
  ['thousand', 1000],
  ['million', 1_000_000],
  ['billion', 1_000_000_000],
  ['trillion', 1_000_000_000_000],
]

Class Method Summary collapse

Class Method Details

.numerize(string) ⇒ Object


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# File 'lib/numerizer/numerizer.rb', line 47

def self.numerize(string)
  string = string.dup

  # preprocess
  string.gsub!(/ +|([^\d])-([^\d])/, '\1 \2') # will mutilate hyphenated-words but shouldn't matter for date extraction
  string.gsub!(/a half/, 'haAlf') # take the 'a' out so it doesn't turn into a 1, save the half for the end
  
  # easy/direct replacements
  
  DIRECT_NUMS.each do |dn|
    string.gsub!(/#{dn[0]}/i, '<num>' + dn[1])
  end
  
  # ten, twenty, etc.
  
  TEN_PREFIXES.each do |tp|
    string.gsub!(/(?:#{tp[0]}) *<num>(\d(?=[^\d]|$))*/i) { '<num>' + (tp[1] + $1.to_i).to_s }
  end
  
  TEN_PREFIXES.each do |tp|
    string.gsub!(/#{tp[0]}/i) { '<num>' + tp[1].to_s }
  end
  
  # hundreds, thousands, millions, etc.
  
  BIG_PREFIXES.each do |bp|
    string.gsub!(/(?:<num>)?(\d*) *#{bp[0]}/i) { '<num>' + (bp[1] * $1.to_i).to_s}
    andition(string)
  end
  
  # fractional addition
  # I'm not combining this with the previous block as using float addition complicates the strings
  # (with extraneous .0's and such )
  string.gsub!(/(\d+)(?: | and |-)*haAlf/i) { ($1.to_f + 0.5).to_s }
  
  string.gsub(/<num>/, '')
end