Module: Philiprehberger::FuzzyMatch::Soundex

Defined in:
lib/philiprehberger/fuzzy_match/soundex.rb

Constant Summary collapse

CODES = 
{
  'B' => '1', 'F' => '1', 'P' => '1', 'V' => '1',
  'C' => '2', 'G' => '2', 'J' => '2', 'K' => '2', 'Q' => '2', 'S' => '2', 'X' => '2', 'Z' => '2',
  'D' => '3', 'T' => '3',
  'L' => '4',
  'M' => '5', 'N' => '5',
  'R' => '6'
}.freeze

Class Method Summary collapse

Class Method Details

.code(string) ⇒ Object 



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# File 'lib/philiprehberger/fuzzy_match/soundex.rb', line 15

def self.code(string)
  return '' if string.nil? || string.empty?

  upper = string.upcase.gsub(/[^A-Z]/, '')
  return '' if upper.empty?

  result = upper[0]
  prev_code = CODES[result]

  upper[1..].each_char do |char|
    char_code = CODES[char]
    next if char_code.nil? || char_code == prev_code

    result << char_code
    prev_code = char_code
    break if result.length == 4
  end

  result.ljust(4, '0')
end