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| 1 /* | |
| 2 ** The author disclaims copyright to this source code. | |
| 3 ** | |
| 4 ************************************************************************* | |
| 5 ** Implementation of the "simple" full-text-search tokenizer. | |
| 6 */ | |
| 7 | |
| 8 #include <assert.h> | |
| 9 #if !defined(__APPLE__) | |
| 10 #include <malloc.h> | |
| 11 #else | |
| 12 #include <stdlib.h> | |
| 13 #endif | |
| 14 #include <stdio.h> | |
| 15 #include <string.h> | |
| 16 #include <ctype.h> | |
| 17 | |
| 18 #include "tokenizer.h" | |
| 19 | |
| 20 /* Duplicate a string; the caller must free() the returned string. | |
| 21 * (We don't use strdup() since it's not part of the standard C library and | |
| 22 * may not be available everywhere.) */ | |
| 23 /* TODO(shess) Copied from fulltext.c, consider util.c for such | |
| 24 ** things. */ | |
| 25 static char *string_dup(const char *s){ | |
| 26 char *str = malloc(strlen(s) + 1); | |
| 27 strcpy(str, s); | |
| 28 return str; | |
| 29 } | |
| 30 | |
| 31 typedef struct simple_tokenizer { | |
| 32 sqlite3_tokenizer base; | |
| 33 const char *zDelim; /* token delimiters */ | |
| 34 } simple_tokenizer; | |
| 35 | |
| 36 typedef struct simple_tokenizer_cursor { | |
| 37 sqlite3_tokenizer_cursor base; | |
| 38 const char *pInput; /* input we are tokenizing */ | |
| 39 int nBytes; /* size of the input */ | |
| 40 const char *pCurrent; /* current position in pInput */ | |
| 41 int iToken; /* index of next token to be returned */ | |
| 42 char *zToken; /* storage for current token */ | |
| 43 int nTokenBytes; /* actual size of current token */ | |
| 44 int nTokenAllocated; /* space allocated to zToken buffer */ | |
| 45 } simple_tokenizer_cursor; | |
| 46 | |
| 47 static sqlite3_tokenizer_module simpleTokenizerModule;/* forward declaration */ | |
| 48 | |
| 49 static int simpleCreate( | |
| 50 int argc, const char **argv, | |
| 51 sqlite3_tokenizer **ppTokenizer | |
| 52 ){ | |
| 53 simple_tokenizer *t; | |
| 54 | |
| 55 t = (simple_tokenizer *) malloc(sizeof(simple_tokenizer)); | |
| 56 /* TODO(shess) Delimiters need to remain the same from run to run, | |
| 57 ** else we need to reindex. One solution would be a meta-table to | |
| 58 ** track such information in the database, then we'd only want this | |
| 59 ** information on the initial create. | |
| 60 */ | |
| 61 if( argc>1 ){ | |
| 62 t->zDelim = string_dup(argv[1]); | |
| 63 } else { | |
| 64 /* Build a string excluding alphanumeric ASCII characters */ | |
| 65 char zDelim[0x80]; /* nul-terminated, so nul not a member */ | |
| 66 int i, j; | |
| 67 for(i=1, j=0; i<0x80; i++){ | |
| 68 if( !isalnum(i) ){ | |
| 69 zDelim[j++] = i; | |
| 70 } | |
| 71 } | |
| 72 zDelim[j++] = '\0'; | |
| 73 assert( j<=sizeof(zDelim) ); | |
| 74 t->zDelim = string_dup(zDelim); | |
| 75 } | |
| 76 | |
| 77 *ppTokenizer = &t->base; | |
| 78 return SQLITE_OK; | |
| 79 } | |
| 80 | |
| 81 static int simpleDestroy(sqlite3_tokenizer *pTokenizer){ | |
| 82 simple_tokenizer *t = (simple_tokenizer *) pTokenizer; | |
| 83 | |
| 84 free((void *) t->zDelim); | |
| 85 free(t); | |
| 86 | |
| 87 return SQLITE_OK; | |
| 88 } | |
| 89 | |
| 90 static int simpleOpen( | |
| 91 sqlite3_tokenizer *pTokenizer, | |
| 92 const char *pInput, int nBytes, | |
| 93 sqlite3_tokenizer_cursor **ppCursor | |
| 94 ){ | |
| 95 simple_tokenizer_cursor *c; | |
| 96 | |
| 97 c = (simple_tokenizer_cursor *) malloc(sizeof(simple_tokenizer_cursor)); | |
| 98 c->pInput = pInput; | |
| 99 c->nBytes = nBytes<0 ? (int) strlen(pInput) : nBytes; | |
| 100 c->pCurrent = c->pInput; /* start tokenizing at the beginning */ | |
| 101 c->iToken = 0; | |
| 102 c->zToken = NULL; /* no space allocated, yet. */ | |
| 103 c->nTokenBytes = 0; | |
| 104 c->nTokenAllocated = 0; | |
| 105 | |
| 106 *ppCursor = &c->base; | |
| 107 return SQLITE_OK; | |
| 108 } | |
| 109 | |
| 110 static int simpleClose(sqlite3_tokenizer_cursor *pCursor){ | |
| 111 simple_tokenizer_cursor *c = (simple_tokenizer_cursor *) pCursor; | |
| 112 | |
| 113 if( NULL!=c->zToken ){ | |
| 114 free(c->zToken); | |
| 115 } | |
| 116 free(c); | |
| 117 | |
| 118 return SQLITE_OK; | |
| 119 } | |
| 120 | |
| 121 static int simpleNext( | |
| 122 sqlite3_tokenizer_cursor *pCursor, | |
| 123 const char **ppToken, int *pnBytes, | |
| 124 int *piStartOffset, int *piEndOffset, int *piPosition | |
| 125 ){ | |
| 126 simple_tokenizer_cursor *c = (simple_tokenizer_cursor *) pCursor; | |
| 127 simple_tokenizer *t = (simple_tokenizer *) pCursor->pTokenizer; | |
| 128 int ii; | |
| 129 | |
| 130 while( c->pCurrent-c->pInput<c->nBytes ){ | |
| 131 int n = (int) strcspn(c->pCurrent, t->zDelim); | |
| 132 if( n>0 ){ | |
| 133 if( n+1>c->nTokenAllocated ){ | |
| 134 c->zToken = realloc(c->zToken, n+1); | |
| 135 } | |
| 136 for(ii=0; ii<n; ii++){ | |
| 137 /* TODO(shess) This needs expansion to handle UTF-8 | |
| 138 ** case-insensitivity. | |
| 139 */ | |
| 140 char ch = c->pCurrent[ii]; | |
| 141 c->zToken[ii] = (unsigned char)ch<0x80 ? tolower((unsigned char)ch):ch; | |
| 142 } | |
| 143 c->zToken[n] = '\0'; | |
| 144 *ppToken = c->zToken; | |
| 145 *pnBytes = n; | |
| 146 *piStartOffset = (int) (c->pCurrent-c->pInput); | |
| 147 *piEndOffset = *piStartOffset+n; | |
| 148 *piPosition = c->iToken++; | |
| 149 c->pCurrent += n + 1; | |
| 150 | |
| 151 return SQLITE_OK; | |
| 152 } | |
| 153 c->pCurrent += n + 1; | |
| 154 /* TODO(shess) could strspn() to skip delimiters en masse. Needs | |
| 155 ** to happen in two places, though, which is annoying. | |
| 156 */ | |
| 157 } | |
| 158 return SQLITE_DONE; | |
| 159 } | |
| 160 | |
| 161 static sqlite3_tokenizer_module simpleTokenizerModule = { | |
| 162 0, | |
| 163 simpleCreate, | |
| 164 simpleDestroy, | |
| 165 simpleOpen, | |
| 166 simpleClose, | |
| 167 simpleNext, | |
| 168 }; | |
| 169 | |
| 170 void get_simple_tokenizer_module( | |
| 171 sqlite3_tokenizer_module **ppModule | |
| 172 ){ | |
| 173 *ppModule = &simpleTokenizerModule; | |
| 174 } | |
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Issue 2846743003:
[sql] Remove SQLite 3.10.2 reference directory. (Closed)
