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
|
/*
** 2012 May 24
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
******************************************************************************
**
** Implementation of the "unicode" full-text-search tokenizer.
*/
#ifndef SQLITE_DISABLE_FTS3_UNICODE
#include "fts3Int.h"
#if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3)
#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "fts3_tokenizer.h"
/*
** The following two macros - READ_UTF8 and WRITE_UTF8 - have been copied
** from the sqlite3 source file utf.c. If this file is compiled as part
** of the amalgamation, they are not required.
*/
#ifndef SQLITE_AMALGAMATION
static const unsigned char sqlite3Utf8Trans1[] = {
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x00, 0x01, 0x02, 0x03, 0x00, 0x01, 0x00, 0x00,
};
#define READ_UTF8(zIn, zTerm, c) \
c = *(zIn++); \
if( c>=0xc0 ){ \
c = sqlite3Utf8Trans1[c-0xc0]; \
while( zIn!=zTerm && (*zIn & 0xc0)==0x80 ){ \
c = (c<<6) + (0x3f & *(zIn++)); \
} \
if( c<0x80 \
|| (c&0xFFFFF800)==0xD800 \
|| (c&0xFFFFFFFE)==0xFFFE ){ c = 0xFFFD; } \
}
#define WRITE_UTF8(zOut, c) { \
if( c<0x00080 ){ \
*zOut++ = (u8)(c&0xFF); \
} \
else if( c<0x00800 ){ \
*zOut++ = 0xC0 + (u8)((c>>6)&0x1F); \
*zOut++ = 0x80 + (u8)(c & 0x3F); \
} \
else if( c<0x10000 ){ \
*zOut++ = 0xE0 + (u8)((c>>12)&0x0F); \
*zOut++ = 0x80 + (u8)((c>>6) & 0x3F); \
*zOut++ = 0x80 + (u8)(c & 0x3F); \
}else{ \
*zOut++ = 0xF0 + (u8)((c>>18) & 0x07); \
*zOut++ = 0x80 + (u8)((c>>12) & 0x3F); \
*zOut++ = 0x80 + (u8)((c>>6) & 0x3F); \
*zOut++ = 0x80 + (u8)(c & 0x3F); \
} \
}
#endif /* ifndef SQLITE_AMALGAMATION */
typedef struct unicode_tokenizer unicode_tokenizer;
typedef struct unicode_cursor unicode_cursor;
struct unicode_tokenizer {
sqlite3_tokenizer base;
};
struct unicode_cursor {
sqlite3_tokenizer_cursor base;
const unsigned char *aInput; /* Input text being tokenized */
int nInput; /* Size of aInput[] in bytes */
int iOff; /* Current offset within aInput[] */
int iToken; /* Index of next token to be returned */
char *zToken; /* storage for current token */
int nAlloc; /* space allocated at zToken */
};
/*
** Create a new tokenizer instance.
*/
static int unicodeCreate(
int nArg, /* Size of array argv[] */
const char * const *azArg, /* Tokenizer creation arguments */
sqlite3_tokenizer **pp /* OUT: New tokenizer handle */
){
unicode_tokenizer *pNew; /* New tokenizer object */
pNew = (unicode_tokenizer *) sqlite3_malloc(sizeof(unicode_tokenizer));
if( pNew==NULL ){
return SQLITE_NOMEM;
}
memset(pNew, 0, sizeof(unicode_tokenizer));
*pp = &pNew->base;
return SQLITE_OK;
}
/*
** Destroy a tokenizer allocated by unicodeCreate().
*/
static int unicodeDestroy(sqlite3_tokenizer *pTokenizer){
sqlite3_free(pTokenizer);
return SQLITE_OK;
}
/*
** Prepare to begin tokenizing a particular string. The input
** string to be tokenized is pInput[0..nBytes-1]. A cursor
** used to incrementally tokenize this string is returned in
** *ppCursor.
*/
static int unicodeOpen(
sqlite3_tokenizer *p, /* The tokenizer */
const char *aInput, /* Input string */
int nInput, /* Size of string aInput in bytes */
sqlite3_tokenizer_cursor **pp /* OUT: New cursor object */
){
unicode_cursor *pCsr;
pCsr = (unicode_cursor *)sqlite3_malloc(sizeof(unicode_cursor));
if( pCsr==0 ){
return SQLITE_NOMEM;
}
memset(pCsr, 0, sizeof(unicode_cursor));
pCsr->aInput = (const unsigned char *)aInput;
if( aInput==0 ){
pCsr->nInput = 0;
}else if( nInput<0 ){
pCsr->nInput = (int)strlen(aInput);
}else{
pCsr->nInput = nInput;
}
*pp = &pCsr->base;
UNUSED_PARAMETER(p);
return SQLITE_OK;
}
/*
** Close a tokenization cursor previously opened by a call to
** simpleOpen() above.
*/
static int unicodeClose(sqlite3_tokenizer_cursor *pCursor){
unicode_cursor *pCsr = (unicode_cursor *) pCursor;
sqlite3_free(pCsr->zToken);
sqlite3_free(pCsr);
return SQLITE_OK;
}
/*
** Extract the next token from a tokenization cursor. The cursor must
** have been opened by a prior call to simpleOpen().
*/
static int unicodeNext(
sqlite3_tokenizer_cursor *p, /* Cursor returned by simpleOpen */
const char **paToken, /* OUT: Token text */
int *pnToken, /* OUT: Number of bytes at *paToken */
int *piStart, /* OUT: Starting offset of token */
int *piEnd, /* OUT: Ending offset of token */
int *piPos /* OUT: Position integer of token */
){
unicode_cursor *pCsr = (unicode_cursor *)p;
int iCode;
char *zOut;
const unsigned char *z = &pCsr->aInput[pCsr->iOff];
const unsigned char *zStart = z;
const unsigned char *zEnd;
const unsigned char *zTerm = &pCsr->aInput[pCsr->nInput];
/* Scan past any delimiter characters before the start of the next token.
** Return SQLITE_DONE early if this takes us all the way to the end of
** the input. */
while( z<zTerm ){
READ_UTF8(z, zTerm, iCode);
if( sqlite3FtsUnicodeIsalnum(iCode) ) break;
zStart = z;
}
if( zStart>=zTerm ) return SQLITE_DONE;
zOut = pCsr->zToken;
do {
/* Grow the output buffer if required. */
if( (zOut-pCsr->zToken)>=(pCsr->nAlloc-4) ){
char *zNew = sqlite3_realloc(pCsr->zToken, pCsr->nAlloc+64);
if( !zNew ) return SQLITE_NOMEM;
zOut = &zNew[zOut - pCsr->zToken];
pCsr->zToken = zNew;
pCsr->nAlloc += 64;
}
/* Write the folded case of the last character read to the output */
zEnd = z;
WRITE_UTF8(zOut, sqlite3FtsUnicodeTolower(iCode));
/* If the cursor is not at EOF, read the next character */
if( z>=zTerm ) break;
READ_UTF8(z, zTerm, iCode);
}while( sqlite3FtsUnicodeIsalnum(iCode) );
/* Set the output variables and return. */
pCsr->iOff = (z - pCsr->aInput);
*paToken = pCsr->zToken;
*pnToken = zOut - pCsr->zToken;
*piStart = (zStart - pCsr->aInput);
*piEnd = (zEnd - pCsr->aInput);
*piPos = pCsr->iToken++;
return SQLITE_OK;
}
/*
** Set *ppModule to a pointer to the sqlite3_tokenizer_module
** structure for the unicode tokenizer.
*/
void sqlite3Fts3UnicodeTokenizer(sqlite3_tokenizer_module const **ppModule){
static const sqlite3_tokenizer_module module = {
0,
unicodeCreate,
unicodeDestroy,
unicodeOpen,
unicodeClose,
unicodeNext,
0,
};
*ppModule = &module;
}
#endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3) */
#endif /* ifndef SQLITE_DISABLE_FTS3_UNICODE */
|
