Class: Numerizer

Inherits:
Object
  • Object
show all
Defined in:
lib/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'],
  ['ten', '10'],
  ['\ba[\b^$]', '1'] # doesn't make sense for an 'a' at the end to be a 1
]
SINGLE_NUMS = 
[
  ['one', 1],
  ['two', 2],
  ['three', 3],
  #['four(\W|$)', '4\1'],  # The weird regex is so that it matches four but not fourty
  ['four', 4],
  ['five', 5],
  ['six', 6],
  ['seven', 7],
  ['eight', 8],
  ['nine', 9]
]
TEN_PREFIXES = 
[ ['twenty', 20],
  ['thirty', 30],
  ['forty', 40],
  ['fourty', 40], # Common misspelling
  ['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],
]
FRACTIONS = 
[ ['half', 2],
  ['third(s)?', 3],
  ['fourth(s)?', 4],
  ['quarter(s)?', 4],
  ['fifth(s)?', 5],
  ['sixth(s)?', 6],
  ['seventh(s)?', 7],
  ['eighth(s)?', 8],
  ['nineth(s)?', 9],
]

Class Method Summary collapse

Class Method Details

.andition(string) ⇒ Object 



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# File 'lib/numerizer.rb', line 123

def self.andition(string)
  sc = StringScanner.new(string)
  while(sc.scan_until(/<num>(\d+)( | and )<num>(\d+)(?=[^\w]|$)/i))
    if sc[2] =~ /and/ || sc[1].size > sc[3].size
      string[(sc.pos - sc.matched_size)..(sc.pos-1)] = '<num>' + (sc[1].to_i + sc[3].to_i).to_s
      sc.reset
    end
  end
end

.numerize(string) ⇒ Object 



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# File 'lib/numerizer.rb', line 75

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

  # preprocess
  string.gsub!(/ +|([^\d])-([^\d])/, '\1 \2') # will mutilate hyphenated-words

  # easy/direct replacements

  (DIRECT_NUMS + SINGLE_NUMS).each do |dn|
     # string.gsub!(/#{dn[0]}/i, '<num>' + dn[1])
     string.gsub!(/(^|\W+)#{dn[0]}($|\W+)/i) {"#{$1}<num>" + dn[1].to_s + $2}
  end

  # ten, twenty, etc.
   # TEN_PREFIXES.each do |tp|
   #   string.gsub!(/(?:#{tp[0]}) *<num>(\d(?=[^\d]|$))*/i) {'<num>' + (tp[1] + $1.to_i).to_s}
   # end
  TEN_PREFIXES.each do |tp|
    SINGLE_NUMS.each do |dn|
      string.gsub!(/(^|\W+)#{tp[0]}#{dn[0]}($|\W+)/i) { 
        "#{$1}<num>" + (tp[1] + dn[1]).to_s + $2
      }
    end
    string.gsub!(/(^|\W+)#{tp[0]}($|\W+)/i) { "#{$1}<num>" + tp[1].to_s + $2 }
  end
  
  # handle fractions
  FRACTIONS.each do |tp|
    string.gsub!(/a #{tp[0]}/i) { '<num>1/' + tp[1].to_s }
    string.gsub!(/\s#{tp[0]}/i) { '/' + tp[1].to_s }
  end
  
  # evaluate fractions when preceded by another number
   string.gsub!(/(\d+)(?: | and |-)+(<num>|\s)*(\d+)\s*\/\s*(\d+)/i) { ($1.to_f + ($3.to_f/$4.to_f)).to_s }
   
  # 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

   andition(string)

  string.gsub(/<num>/, '')
end