author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Fri, 11 Jun 2010 15:29:22 +0300 | |
changeset 25 | 63532cdadd44 |
parent 0 | 08ec8eefde2f |
permissions | -rw-r--r-- |
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/* |
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** 2001 September 15 |
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** |
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** The author disclaims copyright to this source code. In place of |
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** a legal notice, here is a blessing: |
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** |
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** May you do good and not evil. |
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** May you find forgiveness for yourself and forgive others. |
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** May you share freely, never taking more than you give. |
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** |
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************************************************************************* |
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** An tokenizer for SQL |
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** |
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** This file contains C code that implements the sqlite3_complete() API. |
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** This code used to be part of the tokenizer.c source file. But by |
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** separating it out, the code will be automatically omitted from |
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** static links that do not use it. |
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** |
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** $Id: complete.c,v 1.7 2008/06/13 18:24:27 drh Exp $ |
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*/ |
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#include "sqliteInt.h" |
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#ifndef SQLITE_OMIT_COMPLETE |
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|
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/* |
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** This is defined in tokenize.c. We just have to import the definition. |
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*/ |
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#ifndef SQLITE_AMALGAMATION |
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#ifdef SQLITE_ASCII |
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extern const char sqlite3IsAsciiIdChar[]; |
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#define IdChar(C) (((c=C)&0x80)!=0 || (c>0x1f && sqlite3IsAsciiIdChar[c-0x20])) |
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#endif |
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#ifdef SQLITE_EBCDIC |
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extern const char sqlite3IsEbcdicIdChar[]; |
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#define IdChar(C) (((c=C)>=0x42 && sqlite3IsEbcdicIdChar[c-0x40])) |
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#endif |
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#endif /* SQLITE_AMALGAMATION */ |
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|
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|
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/* |
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** Token types used by the sqlite3_complete() routine. See the header |
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** comments on that procedure for additional information. |
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*/ |
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#define tkSEMI 0 |
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#define tkWS 1 |
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#define tkOTHER 2 |
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#define tkEXPLAIN 3 |
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#define tkCREATE 4 |
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#define tkTEMP 5 |
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#define tkTRIGGER 6 |
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#define tkEND 7 |
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|
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/* |
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** Return TRUE if the given SQL string ends in a semicolon. |
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** |
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** Special handling is require for CREATE TRIGGER statements. |
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** Whenever the CREATE TRIGGER keywords are seen, the statement |
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** must end with ";END;". |
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** |
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** This implementation uses a state machine with 7 states: |
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** |
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** (0) START At the beginning or end of an SQL statement. This routine |
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** returns 1 if it ends in the START state and 0 if it ends |
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** in any other state. |
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** |
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** (1) NORMAL We are in the middle of statement which ends with a single |
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** semicolon. |
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** |
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** (2) EXPLAIN The keyword EXPLAIN has been seen at the beginning of |
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** a statement. |
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** |
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** (3) CREATE The keyword CREATE has been seen at the beginning of a |
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** statement, possibly preceeded by EXPLAIN and/or followed by |
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** TEMP or TEMPORARY |
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** |
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** (4) TRIGGER We are in the middle of a trigger definition that must be |
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** ended by a semicolon, the keyword END, and another semicolon. |
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** |
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** (5) SEMI We've seen the first semicolon in the ";END;" that occurs at |
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** the end of a trigger definition. |
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** |
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** (6) END We've seen the ";END" of the ";END;" that occurs at the end |
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** of a trigger difinition. |
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** |
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** Transitions between states above are determined by tokens extracted |
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** from the input. The following tokens are significant: |
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** |
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** (0) tkSEMI A semicolon. |
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** (1) tkWS Whitespace |
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** (2) tkOTHER Any other SQL token. |
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** (3) tkEXPLAIN The "explain" keyword. |
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** (4) tkCREATE The "create" keyword. |
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** (5) tkTEMP The "temp" or "temporary" keyword. |
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** (6) tkTRIGGER The "trigger" keyword. |
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** (7) tkEND The "end" keyword. |
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** |
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** Whitespace never causes a state transition and is always ignored. |
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** |
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** If we compile with SQLITE_OMIT_TRIGGER, all of the computation needed |
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** to recognize the end of a trigger can be omitted. All we have to do |
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** is look for a semicolon that is not part of an string or comment. |
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101 |
*/ |
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diff
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|
102 |
int sqlite3_complete(const char *zSql){ |
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diff
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|
103 |
u8 state = 0; /* Current state, using numbers defined in header comment */ |
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diff
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|
104 |
u8 token; /* Value of the next token */ |
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diff
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|
105 |
|
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diff
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|
106 |
#ifndef SQLITE_OMIT_TRIGGER |
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|
107 |
/* A complex statement machine used to detect the end of a CREATE TRIGGER |
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diff
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|
108 |
** statement. This is the normal case. |
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|
109 |
*/ |
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diff
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|
110 |
static const u8 trans[7][8] = { |
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|
111 |
/* Token: */ |
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diff
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|
112 |
/* State: ** SEMI WS OTHER EXPLAIN CREATE TEMP TRIGGER END */ |
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diff
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|
113 |
/* 0 START: */ { 0, 0, 1, 2, 3, 1, 1, 1, }, |
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|
114 |
/* 1 NORMAL: */ { 0, 1, 1, 1, 1, 1, 1, 1, }, |
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diff
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|
115 |
/* 2 EXPLAIN: */ { 0, 2, 1, 1, 3, 1, 1, 1, }, |
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|
116 |
/* 3 CREATE: */ { 0, 3, 1, 1, 1, 3, 4, 1, }, |
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|
117 |
/* 4 TRIGGER: */ { 5, 4, 4, 4, 4, 4, 4, 4, }, |
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|
118 |
/* 5 SEMI: */ { 5, 5, 4, 4, 4, 4, 4, 6, }, |
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|
119 |
/* 6 END: */ { 0, 6, 4, 4, 4, 4, 4, 4, }, |
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|
120 |
}; |
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|
121 |
#else |
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|
122 |
/* If triggers are not suppored by this compile then the statement machine |
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|
123 |
** used to detect the end of a statement is much simplier |
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|
124 |
*/ |
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|
125 |
static const u8 trans[2][3] = { |
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|
126 |
/* Token: */ |
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|
127 |
/* State: ** SEMI WS OTHER */ |
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|
128 |
/* 0 START: */ { 0, 0, 1, }, |
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|
129 |
/* 1 NORMAL: */ { 0, 1, 1, }, |
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|
130 |
}; |
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Revision: 201003
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|
131 |
#endif /* SQLITE_OMIT_TRIGGER */ |
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|
132 |
|
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Revision: 201003
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|
133 |
while( *zSql ){ |
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Revision: 201003
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diff
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|
134 |
switch( *zSql ){ |
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Revision: 201003
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parents:
diff
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|
135 |
case ';': { /* A semicolon */ |
08ec8eefde2f
Revision: 201003
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diff
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|
136 |
token = tkSEMI; |
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Revision: 201003
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parents:
diff
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|
137 |
break; |
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Revision: 201003
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parents:
diff
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|
138 |
} |
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Revision: 201003
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parents:
diff
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|
139 |
case ' ': |
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Revision: 201003
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|
140 |
case '\r': |
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Revision: 201003
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diff
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|
141 |
case '\t': |
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Revision: 201003
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parents:
diff
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|
142 |
case '\n': |
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Revision: 201003
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diff
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|
143 |
case '\f': { /* White space is ignored */ |
08ec8eefde2f
Revision: 201003
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parents:
diff
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|
144 |
token = tkWS; |
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Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
145 |
break; |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
146 |
} |
08ec8eefde2f
Revision: 201003
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parents:
diff
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|
147 |
case '/': { /* C-style comments */ |
08ec8eefde2f
Revision: 201003
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parents:
diff
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|
148 |
if( zSql[1]!='*' ){ |
08ec8eefde2f
Revision: 201003
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parents:
diff
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|
149 |
token = tkOTHER; |
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Revision: 201003
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parents:
diff
changeset
|
150 |
break; |
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Revision: 201003
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parents:
diff
changeset
|
151 |
} |
08ec8eefde2f
Revision: 201003
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parents:
diff
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|
152 |
zSql += 2; |
08ec8eefde2f
Revision: 201003
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parents:
diff
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|
153 |
while( zSql[0] && (zSql[0]!='*' || zSql[1]!='/') ){ zSql++; } |
08ec8eefde2f
Revision: 201003
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parents:
diff
changeset
|
154 |
if( zSql[0]==0 ) return 0; |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
155 |
zSql++; |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
156 |
token = tkWS; |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
157 |
break; |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
158 |
} |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
159 |
case '-': { /* SQL-style comments from "--" to end of line */ |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
160 |
if( zSql[1]!='-' ){ |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
161 |
token = tkOTHER; |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
162 |
break; |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
163 |
} |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
164 |
while( *zSql && *zSql!='\n' ){ zSql++; } |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
165 |
if( *zSql==0 ) return state==0; |
08ec8eefde2f
Revision: 201003
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parents:
diff
changeset
|
166 |
token = tkWS; |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
167 |
break; |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
168 |
} |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
169 |
case '[': { /* Microsoft-style identifiers in [...] */ |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
170 |
zSql++; |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
171 |
while( *zSql && *zSql!=']' ){ zSql++; } |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
172 |
if( *zSql==0 ) return 0; |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
173 |
token = tkOTHER; |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
174 |
break; |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
175 |
} |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
176 |
case '`': /* Grave-accent quoted symbols used by MySQL */ |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
177 |
case '"': /* single- and double-quoted strings */ |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
178 |
case '\'': { |
08ec8eefde2f
Revision: 201003
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parents:
diff
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|
179 |
int c = *zSql; |
08ec8eefde2f
Revision: 201003
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parents:
diff
changeset
|
180 |
zSql++; |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
181 |
while( *zSql && *zSql!=c ){ zSql++; } |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
182 |
if( *zSql==0 ) return 0; |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
183 |
token = tkOTHER; |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
184 |
break; |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
185 |
} |
08ec8eefde2f
Revision: 201003
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parents:
diff
changeset
|
186 |
default: { |
08ec8eefde2f
Revision: 201003
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parents:
diff
changeset
|
187 |
int c; |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
188 |
if( IdChar((u8)*zSql) ){ |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
189 |
/* Keywords and unquoted identifiers */ |
08ec8eefde2f
Revision: 201003
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parents:
diff
changeset
|
190 |
int nId; |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
191 |
for(nId=1; IdChar(zSql[nId]); nId++){} |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
192 |
#ifdef SQLITE_OMIT_TRIGGER |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
193 |
token = tkOTHER; |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
194 |
#else |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
195 |
switch( *zSql ){ |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
196 |
case 'c': case 'C': { |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
197 |
if( nId==6 && sqlite3StrNICmp(zSql, "create", 6)==0 ){ |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
198 |
token = tkCREATE; |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
199 |
}else{ |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
200 |
token = tkOTHER; |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
201 |
} |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
202 |
break; |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
203 |
} |
08ec8eefde2f
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
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204 |
case 't': case 'T': { |
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if( nId==7 && sqlite3StrNICmp(zSql, "trigger", 7)==0 ){ |
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token = tkTRIGGER; |
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207 |
}else if( nId==4 && sqlite3StrNICmp(zSql, "temp", 4)==0 ){ |
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token = tkTEMP; |
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}else if( nId==9 && sqlite3StrNICmp(zSql, "temporary", 9)==0 ){ |
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token = tkTEMP; |
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211 |
}else{ |
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token = tkOTHER; |
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213 |
} |
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214 |
break; |
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215 |
} |
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case 'e': case 'E': { |
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if( nId==3 && sqlite3StrNICmp(zSql, "end", 3)==0 ){ |
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token = tkEND; |
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}else |
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#ifndef SQLITE_OMIT_EXPLAIN |
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if( nId==7 && sqlite3StrNICmp(zSql, "explain", 7)==0 ){ |
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token = tkEXPLAIN; |
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}else |
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#endif |
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225 |
{ |
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token = tkOTHER; |
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} |
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228 |
break; |
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229 |
} |
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default: { |
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token = tkOTHER; |
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232 |
break; |
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233 |
} |
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234 |
} |
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#endif /* SQLITE_OMIT_TRIGGER */ |
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zSql += nId-1; |
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237 |
}else{ |
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238 |
/* Operators and special symbols */ |
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239 |
token = tkOTHER; |
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240 |
} |
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241 |
break; |
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242 |
} |
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243 |
} |
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244 |
state = trans[state][token]; |
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245 |
zSql++; |
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246 |
} |
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247 |
return state==0; |
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248 |
} |
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249 |
|
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250 |
#ifndef SQLITE_OMIT_UTF16 |
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251 |
/* |
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252 |
** This routine is the same as the sqlite3_complete() routine described |
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253 |
** above, except that the parameter is required to be UTF-16 encoded, not |
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254 |
** UTF-8. |
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255 |
*/ |
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256 |
int sqlite3_complete16(const void *zSql){ |
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257 |
sqlite3_value *pVal; |
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258 |
char const *zSql8; |
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259 |
int rc = SQLITE_NOMEM; |
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260 |
|
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261 |
#ifndef SQLITE_OMIT_AUTOINIT |
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262 |
rc = sqlite3_initialize(); |
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263 |
if( rc ) return rc; |
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|
264 |
#endif |
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265 |
pVal = sqlite3ValueNew(0); |
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266 |
sqlite3ValueSetStr(pVal, -1, zSql, SQLITE_UTF16NATIVE, SQLITE_STATIC); |
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|
267 |
zSql8 = sqlite3ValueText(pVal, SQLITE_UTF8); |
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|
268 |
if( zSql8 ){ |
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|
269 |
rc = sqlite3_complete(zSql8); |
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|
270 |
}else{ |
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271 |
rc = SQLITE_NOMEM; |
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|
272 |
} |
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273 |
sqlite3ValueFree(pVal); |
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|
274 |
return sqlite3ApiExit(0, rc); |
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|
275 |
} |
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|
276 |
#endif /* SQLITE_OMIT_UTF16 */ |
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|
277 |
#endif /* SQLITE_OMIT_COMPLETE */ |