Mercurial > cpython-lru_cache-weakref

annotate Modules/soundex.c @ 5817:48b94de85bf3 legacy-trunk

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Extensive changes by AMK.
author Guido van Rossum <guido@python.org>
date Thu, 17 Jul 1997 16:29:42 +0000
parents b2a1c99ca642
children 38023a425e48
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1 /*
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2 [Header: soundexmodule.c,v 1.2 95/05/02 15:40:45 dwwillia Exp ]
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3
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4 Perform soundex comparisons on strings.
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5
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6 Soundex is an algorithm that hashes English strings into numerical value.
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7 Strings that sound the same are hashed to the same value. This allows
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8 for non-literal string matching.
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9
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10 From: David Wayne Williams <dwwillia@iucf.indiana.edu>
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11
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12 Apr 29 1996 - added get_soundex method that returns the soundex of a
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13 string (chrish@qnx.com)
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14 May 2 1996 - added doc strings (chrish@qnx.com)
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15 */
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16
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17 #include <string.h>
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18 #include <ctype.h>
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19 #include "Python.h"
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20
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21 static char soundex_module__doc__[] =
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22 "Perform Soundex comparisons on strings, allowing non-literal matching.";
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23
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24 static void soundex_hash(char *str, char *result)
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25 {
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26 char *sptr = str; /* pointer into str */
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27 char *rptr = result; /* pointer into result */
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28
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29 if(*str == '\0')
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30 {
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31 strcpy(result,"000000");
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32 return;
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33 }
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34
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35 /* Preserve the first character of the input string.
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36 */
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37 *(rptr++) = toupper(*(sptr++));
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38
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39 /* Translate the rest of the input string into result. The following
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40 transformations are used:
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41
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42 1) All vowels, W, and H, are skipped.
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43
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44 2) BFPV = 1
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45 CGJKQSXZ = 2
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46 DT = 3
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47 L = 4
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48 MN = 5
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49 R = 6
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50
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51 3) Only translate the first of adjacent equal translations. I.E.
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52 remove duplicate digits.
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53 */
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54
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55 for(;(rptr - result) < 6 && *sptr != '\0';sptr++)
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56 {
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57 switch (toupper(*sptr))
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58 {
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59 case 'W':
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60 case 'H':
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61 case 'A':
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62 case 'I':
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63 case 'O':
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64 case 'U':
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65 case 'Y':
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66 break;
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67 case 'B':
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68 case 'F':
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69 case 'P':
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70 case 'V':
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71 if(*(rptr - 1) != '1')
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72 *(rptr++) = '1';
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73 break;
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74 case 'C':
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75 case 'G':
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76 case 'J':
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77 case 'K':
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78 case 'Q':
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79 case 'S':
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80 case 'X':
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81 case 'Z':
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82 if(*(rptr - 1) != '2')
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83 *(rptr++) = '2';
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84 break;
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85 case 'D':
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86 case 'T':
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87 if(*(rptr - 1) != '3')
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88 *(rptr++) = '3';
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89 break;
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90 case 'L':
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91 if(*(rptr - 1) != '4')
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92 *(rptr++) = '4';
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93 break;
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94 case 'M':
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95 case 'N':
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96 if(*(rptr - 1) != '5')
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97 *(rptr++) = '5';
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98 break;
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99 case 'R':
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100 if(*(rptr -1) != '6')
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101 *(rptr++) = '6';
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102 default:
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103 break;
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104 }
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105 }
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106
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107 /* Pad 0's on right side of string out to 6 characters.
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108 */
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109 for(; rptr < result + 6; rptr++)
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110 *rptr = '0';
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111
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112 /* Terminate the result string.
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113 */
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114 *(result + 6) = '\0';
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115 }
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116
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117
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118 /* Return the actual soundex value. */
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119 /* Added by Chris Herborth (chrish@qnx.com) */
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120 static char soundex_get_soundex__doc__[] =
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121 "Return the (English) Soundex hash value for a string.";
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122 static PyObject *
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123 get_soundex(PyObject *self, PyObject *args)
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124 {
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125 char *str;
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126 char sdx[7];
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127
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128 if(!PyArg_ParseTuple( args, "s", &str))
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129 return NULL;
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130
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131 soundex_hash(str, sdx);
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132
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133 return PyString_FromString(sdx);
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134 }
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135
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136 static char soundex_sound_similar__doc__[] =
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137 "Compare two strings to see if they sound similar (English).";
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138 static PyObject *
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139 sound_similar(PyObject *self, PyObject *args)
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140 {
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141 char *str1, *str2;
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142 char res1[7], res2[7];
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143
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144 if(!PyArg_ParseTuple(args, "ss", &str1, &str2))
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145 return NULL;
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146
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147 soundex_hash(str1, res1);
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148 soundex_hash(str2, res2);
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149
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150 if(!strcmp(res1,res2))
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151 return Py_BuildValue("i",1);
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152 else
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153 return Py_BuildValue("i",0);
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154 }
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155
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156 /* Python Method Table.
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157 */
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158 static PyMethodDef SoundexMethods[] =
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159 {
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160 {"sound_similar", sound_similar, 1, soundex_sound_similar__doc__},
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161 {"get_soundex", get_soundex, 1, soundex_get_soundex__doc__},
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162
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163 {NULL, NULL } /* sentinel */
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164 };
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165
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166
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167 /* Register the method table.
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168 */
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169 void
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170 initsoundex()
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171 {
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172 (void) Py_InitModule4("soundex",
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173 SoundexMethods,
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174 soundex_module__doc__,
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175 (PyObject *)NULL,
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176 PYTHON_API_VERSION);
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177 }