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
|
/*
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1996-2009 Oracle. All rights reserved.
*
*/
#include "db_sql.h"
extern void bdb_create_database(Token *, Parse *pParse);
static void
preparserSyntaxError(t, pParse)
Token *t;
Parse *pParse;
{
sqlite3ErrorMsg(pParse, "near \"%T\": syntax error", t);
pParse->parseError = 1;
}
/*
* The pre-parser is invoked for each token found by the lexical
* analyzer. It passes most tokens on to the main SQLite parser
* unchanged; however it maintains its own state machine so that it
* can notice certain sequences of tokens. In particular, it catches
* CREATE DATABASE, which is a sequence that the SQLite parser does
* not recognize.
*/
void preparser(pEngine, tokenType, token, pParse)
void *pEngine;
int tokenType;
Token token;
Parse *pParse;
{
static enum preparserState {
IDLE = 0, GOT_CREATE = 1, GOT_DATABASE = 2, GOT_NAME = 3
} state = IDLE;
switch (state) {
case IDLE:
if (tokenType == TK_CREATE)
state = GOT_CREATE;
else /* pass token to sqlite parser -- the common case */
sqlite3Parser(pEngine, tokenType,
pParse->sLastToken, pParse);
break;
case GOT_CREATE:
if (tokenType == TK_DATABASE)
state = GOT_DATABASE;
else { /* return to idle, pass the CREATE token, then
* the current token to the sqlite parser */
state = IDLE;
sqlite3Parser(pEngine, TK_CREATE,
pParse->sLastToken, pParse);
sqlite3Parser(pEngine, tokenType,
pParse->sLastToken, pParse);
}
break;
case GOT_DATABASE:
if (tokenType == TK_ID) {
state = GOT_NAME;
bdb_create_database(&token, pParse);
} else
preparserSyntaxError(&token, pParse);
break;
case GOT_NAME:
if (tokenType == TK_SEMI)
state = IDLE;
else
preparserSyntaxError(&token, pParse);
break;
}
}
|
