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# encoding: utf-8
#
# Ruby implementation of the Double Metaphone algorithm by Lawrence Philips,
# originally published in the June 2000 issue of C/C++ Users Journal.
#
# Based on Stephen Woodbridge's PHP version - http://swoodbridge.com/DoubleMetaPhone/
#
# Author: Tim Fletcher (mail@tfletcher.com)
#
module Text # :nodoc:
module Metaphone
# Returns the primary and secondary double metaphone tokens
# (the secondary will be nil if equal to the primary).
def double_metaphone(str)
primary, secondary, current = [], [], 0
original, length, last = "#{str} ".upcase, str.length, str.length - 1
if /^GN|KN|PN|WR|PS$/ =~ original[0, 2]
current += 1
end
if 'X' == original[0, 1]
primary << :S
secondary << :S
current += 1
end
while primary.length < 4 || secondary.length < 4
break if current > str.length
a, b, c = double_metaphone_lookup(original, current, length, last)
primary << a if a
secondary << b if b
current += c if c
end
primary, secondary = primary.join("")[0, 4], secondary.join("")[0, 4]
return primary, (primary == secondary ? nil : secondary)
end
private
def slavo_germanic?(str)
/W|K|CZ|WITZ/ =~ str
end
def vowel?(str)
/^A|E|I|O|U|Y$/ =~ str
end
def double_metaphone_lookup(str, pos, length, last)
case str[pos, 1]
when /^A|E|I|O|U|Y$/
if 0 == pos
return :A, :A, 1
else
return nil, nil, 1
end
when 'B'
return :P, :P, ('B' == str[pos + 1, 1] ? 2 : 1)
when 'Ç'
return :S, :S, 1
when 'C'
if pos > 1 &&
!vowel?(str[pos - 2, 1]) &&
'ACH' == str[pos - 1, 3] &&
str[pos + 2, 1] != 'I' && (
str[pos + 2, 1] != 'E' ||
str[pos - 2, 6] =~ /^(B|M)ACHER$/
) then
return :K, :K, 2
elsif 0 == pos && 'CAESAR' == str[pos, 6]
return :S, :S, 2
elsif 'CHIA' == str[pos, 4]
return :K, :K, 2
elsif 'CH' == str[pos, 2]
if pos > 0 && 'CHAE' == str[pos, 4]
return :K, :X, 2
elsif 0 == pos && (
['HARAC', 'HARIS'].include?(str[pos + 1, 5]) ||
['HOR', 'HYM', 'HIA', 'HEM'].include?(str[pos + 1, 3])
) && str[0, 5] != 'CHORE' then
return :K, :K, 2
elsif ['VAN ','VON '].include?(str[0, 4]) ||
'SCH' == str[0, 3] ||
['ORCHES','ARCHIT','ORCHID'].include?(str[pos - 2, 6]) ||
['T','S'].include?(str[pos + 2, 1]) || (
((0 == pos) || ['A','O','U','E'].include?(str[pos - 1, 1])) &&
['L','R','N','M','B','H','F','V','W',' '].include?(str[pos + 2, 1])
) then
return :K, :K, 2
elsif pos > 0
return ('MC' == str[0, 2] ? 'K' : 'X'), 'K', 2
else
return :X, :X, 2
end
elsif 'CZ' == str[pos, 2] && 'WICZ' != str[pos - 2, 4]
return :S, :X, 2
elsif 'CIA' == str[pos + 1, 3]
return :X, :X, 3
elsif 'CC' == str[pos, 2] && !(1 == pos && 'M' == str[0, 1])
if /^I|E|H$/ =~ str[pos + 2, 1] && 'HU' != str[pos + 2, 2]
if (1 == pos && 'A' == str[pos - 1, 1]) ||
/^UCCE(E|S)$/ =~ str[pos - 1, 5] then
return :KS, :KS, 3
else
return :X, :X, 3
end
else
return :K, :K, 2
end
elsif /^C(K|G|Q)$/ =~ str[pos, 2]
return :K, :K, 2
elsif /^C(I|E|Y)$/ =~ str[pos, 2]
return :S, (/^CI(O|E|A)$/ =~ str[pos, 3] ? :X : :S), 2
else
if /^ (C|Q|G)$/ =~ str[pos + 1, 2]
return :K, :K, 3
else
return :K, :K, (/^C|K|Q$/ =~ str[pos + 1, 1] && !(['CE','CI'].include?(str[pos + 1, 2])) ? 2 : 1)
end
end
when 'D'
if 'DG' == str[pos, 2]
if /^I|E|Y$/ =~ str[pos + 2, 1]
return :J, :J, 3
else
return :TK, :TK, 2
end
else
return :T, :T, (/^D(T|D)$/ =~ str[pos, 2] ? 2 : 1)
end
when 'F'
return :F, :F, ('F' == str[pos + 1, 1] ? 2 : 1)
when 'G'
if 'H' == str[pos + 1, 1]
if pos > 0 && !vowel?(str[pos - 1, 1])
return :K, :K, 2
elsif 0 == pos
if 'I' == str[pos + 2, 1]
return :J, :J, 2
else
return :K, :K, 2
end
elsif (pos > 1 && /^B|H|D$/ =~ str[pos - 2, 1]) ||
(pos > 2 && /^B|H|D$/ =~ str[pos - 3, 1]) ||
(pos > 3 && /^B|H$/ =~ str[pos - 4, 1])
return nil, nil, 2
else
if (pos > 2 && 'U' == str[pos - 1, 1] && /^C|G|L|R|T$/ =~ str[pos - 3, 1])
return :F, :F, 2
elsif pos > 0 && 'I' != str[pos - 1, 1]
return :K, :K, 2
else
return nil, nil, 2
end
end
elsif 'N' == str[pos + 1, 1]
if 1 == pos && vowel?(str[0, 1]) && !slavo_germanic?(str)
return :KN, :N, 2
else
if 'EY' != str[pos + 2, 2] && 'Y' != str[pos + 1, 1] && !slavo_germanic?(str)
return :N, :KN, 2
else
return :KN, :KN, 2
end
end
elsif 'LI' == str[pos + 1, 2] && !slavo_germanic?(str)
return :KL, :L, 2
elsif 0 == pos && ('Y' == str[pos + 1, 1] || /^(E(S|P|B|L|Y|I|R)|I(B|L|N|E))$/ =~ str[pos + 1, 2])
return :K, :J, 2
elsif (('ER' == str[pos + 1, 2] || 'Y' == str[pos + 1, 1]) &&
/^(D|R|M)ANGER$/ !~ str[0, 6] &&
/^E|I$/ !~ str[pos - 1, 1] &&
/^(R|O)GY$/ !~ str[pos - 1, 3])
return :K, :J, 2
elsif /^E|I|Y$/ =~ str[pos + 1, 1] || /^(A|O)GGI$/ =~ str[pos - 1, 4]
if (/^V(A|O)N $/ =~ str[0, 4] || 'SCH' == str[0, 3]) || 'ET' == str[pos + 1, 2]
return :K, :K, 2
else
if 'IER ' == str[pos + 1, 4]
return :J, :J, 2
else
return :J, :K, 2
end
end
elsif 'G' == str[pos + 1, 1]
return :K, :K, 2
else
return :K, :K, 1
end
when 'H'
if (0 == pos || vowel?(str[pos - 1, 1])) && vowel?(str[pos + 1, 1])
return :H, :H, 2
else
return nil, nil, 1
end
when 'J'
if 'JOSE' == str[pos, 4] || 'SAN ' == str[0, 4]
if (0 == pos && ' ' == str[pos + 4, 1]) || 'SAN ' == str[0, 4]
return :H, :H, 1
else
return :J, :H, 1
end
else
current = ('J' == str[pos + 1, 1] ? 2 : 1)
if 0 == pos && 'JOSE' != str[pos, 4]
return :J, :A, current
else
if vowel?(str[pos - 1, 1]) && !slavo_germanic?(str) && /^A|O$/ =~ str[pos + 1, 1]
return :J, :H, current
else
if last == pos
return :J, nil, current
else
if /^L|T|K|S|N|M|B|Z$/ !~ str[pos + 1, 1] && /^S|K|L$/ !~ str[pos - 1, 1]
return :J, :J, current
else
return nil, nil, current
end
end
end
end
end
when 'K'
return :K, :K, ('K' == str[pos + 1, 1] ? 2 : 1)
when 'L'
if 'L' == str[pos + 1, 1]
if (((length - 3) == pos && /^(ILL(O|A)|ALLE)$/ =~ str[pos - 1, 4]) ||
((/^(A|O)S$/ =~ str[last - 1, 2] || /^A|O$/ =~ str[last, 1]) && 'ALLE' == str[pos - 1, 4]))
return :L, nil, 2
else
return :L, :L, 2
end
else
return :L, :L, 1
end
when 'M'
if ('UMB' == str[pos - 1, 3] &&
((last - 1) == pos || 'ER' == str[pos + 2, 2])) || 'M' == str[pos + 1, 1]
return :M, :M, 2
else
return :M, :M, 1
end
when 'N'
return :N, :N, ('N' == str[pos + 1, 1] ? 2 : 1)
when 'Ñ'
return :N, :N, 1
when 'P'
if 'H' == str[pos + 1, 1]
return :F, :F, 2
else
return :P, :P, (/^P|B$/ =~ str[pos + 1, 1] ? 2 : 1)
end
when 'Q'
return :K, :K, ('Q' == str[pos + 1, 1] ? 2 : 1)
when 'R'
current = ('R' == str[pos + 1, 1] ? 2 : 1)
if last == pos && !slavo_germanic?(str) && 'IE' == str[pos - 2, 2] && /^M(E|A)$/ !~ str[pos - 4, 2]
return nil, :R, current
else
return :R, :R, current
end
when 'S'
if /^(I|Y)SL$/ =~ str[pos - 1, 3]
return nil, nil, 1
elsif 0 == pos && 'SUGAR' == str[pos, 5]
return :X, :S, 1
elsif 'SH' == str[pos, 2]
if /^H(EIM|OEK|OLM|OLZ)$/ =~ str[pos + 1, 4]
return :S, :S, 2
else
return :X, :X, 2
end
elsif /^SI(O|A)$/ =~ str[pos, 3] || 'SIAN' == str[pos, 4]
return :S, (slavo_germanic?(str) ? :S : :X), 3
elsif (0 == pos && /^M|N|L|W$/ =~ str[pos + 1, 1]) || 'Z' == str[pos + 1, 1]
return :S, :X, ('Z' == str[pos + 1, 1] ? 2 : 1)
elsif 'SC' == str[pos, 2]
if 'H' == str[pos + 2, 1]
if /^OO|ER|EN|UY|ED|EM$/ =~ str[pos + 3, 2]
return (/^E(R|N)$/ =~ str[pos + 3, 2] ? :X : :SK), :SK, 3
else
return :X, ((0 == pos && !vowel?(str[3, 1]) && ('W' != str[pos + 3, 1])) ? :S : :X), 3
end
elsif /^I|E|Y$/ =~ str[pos + 2, 1]
return :S, :S, 3
else
return :SK, :SK, 3
end
else
return (last == pos && /^(A|O)I$/ =~ str[pos - 2, 2] ? nil : 'S'), 'S', (/^S|Z$/ =~ str[pos + 1, 1] ? 2 : 1)
end
when 'T'
if 'TION' == str[pos, 4]
return :X, :X, 3
elsif /^T(IA|CH)$/ =~ str[pos, 3]
return :X, :X, 3
elsif 'TH' == str[pos, 2] || 'TTH' == str[pos, 3]
if /^(O|A)M$/ =~ str[pos + 2, 2] || /^V(A|O)N $/ =~ str[0, 4] || 'SCH' == str[0, 3]
return :T, :T, 2
else
return 0, :T, 2
end
else
return :T, :T, (/^T|D$/ =~ str[pos + 1, 1] ? 2 : 1)
end
when 'V'
return :F, :F, ('V' == str[pos + 1, 1] ? 2 : 1)
when 'W'
if 'WR' == str[pos, 2]
return :R, :R, 2
end
pri, sec = nil, nil
if 0 == pos && (vowel?(str[pos + 1, 1]) || 'WH' == str[pos, 2])
pri = :A
sec = vowel?(str[pos + 1, 1]) ? :F : :A
end
if (last == pos && vowel?(str[pos - 1, 1])) || 'SCH' == str[0, 3] ||
/^EWSKI|EWSKY|OWSKI|OWSKY$/ =~ str[pos - 1, 5]
return pri, "#{sec}F".intern, 1
elsif /^WI(C|T)Z$/ =~ str[pos, 4]
return "#{pri}TS".intern, "#{sec}FX".intern, 4
else
return pri, sec, 1
end
when 'X'
current = (/^C|X$/ =~ str[pos + 1, 1] ? 2 : 1)
if !(last == pos && (/^(I|E)AU$/ =~ str[pos - 3, 3] || /^(A|O)U$/ =~ str[pos - 2, 2]))
return :KS, :KS, current
else
return nil, nil, current
end
when 'Z'
if 'H' == str[pos + 1, 1]
return :J, :J, 2
else
current = ('Z' == str[pos + 1, 1] ? 2 : 1)
if /^Z(O|I|A)$/ =~ str[pos + 1, 2] || (slavo_germanic?(str) && (pos > 0 && 'T' != str[pos - 1, 1]))
return :S, :TS, current
else
return :S, :S, current
end
end
else
return nil, nil, 1
end
end # def double_metaphone_lookup
extend self
end # module Metaphone
end # module Text
|
