/usr/lib/ruby/vendor_ruby/text/double_metaphone.rb is in ruby-text 1.3.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 | # 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
|