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1/*
2** 2001 September 15
3**
4** The author disclaims copyright to this source code. In place of
5** a legal notice, here is a blessing:
6**
7** May you do good and not evil.
8** May you find forgiveness for yourself and forgive others.
9** May you share freely, never taking more than you give.
10**
11*************************************************************************
12** An tokenizer for SQL
13**
14** This file contains C code that implements the sqlite3_complete() API.
15** This code used to be part of the tokenizer.c source file. But by
16** separating it out, the code will be automatically omitted from
17** static links that do not use it.
18**
19** $Id: complete.c,v 1.6 2007/08/27 23:26:59 drh Exp $
20*/
21#include "sqliteInt.h"
22#ifndef SQLITE_OMIT_COMPLETE
23
24/*
25** This is defined in tokenize.c. We just have to import the definition.
26*/
27#ifndef SQLITE_AMALGAMATION
28#ifdef SQLITE_ASCII
29extern const char sqlite3IsAsciiIdChar[];
30#define IdChar(C) (((c=C)&0x80)!=0 || (c>0x1f && sqlite3IsAsciiIdChar[c-0x20]))
31#endif
32#ifdef SQLITE_EBCDIC
33extern const char sqlite3IsEbcdicIdChar[];
34#define IdChar(C) (((c=C)>=0x42 && sqlite3IsEbcdicIdChar[c-0x40]))
35#endif
36#endif /* SQLITE_AMALGAMATION */
37
38
39/*
40** Token types used by the sqlite3_complete() routine. See the header
41** comments on that procedure for additional information.
42*/
43#define tkSEMI 0
44#define tkWS 1
45#define tkOTHER 2
46#define tkEXPLAIN 3
47#define tkCREATE 4
48#define tkTEMP 5
49#define tkTRIGGER 6
50#define tkEND 7
51
52/*
53** Return TRUE if the given SQL string ends in a semicolon.
54**
55** Special handling is require for CREATE TRIGGER statements.
56** Whenever the CREATE TRIGGER keywords are seen, the statement
57** must end with ";END;".
58**
59** This implementation uses a state machine with 7 states:
60**
61** (0) START At the beginning or end of an SQL statement. This routine
62** returns 1 if it ends in the START state and 0 if it ends
63** in any other state.
64**
65** (1) NORMAL We are in the middle of statement which ends with a single
66** semicolon.
67**
68** (2) EXPLAIN The keyword EXPLAIN has been seen at the beginning of
69** a statement.
70**
71** (3) CREATE The keyword CREATE has been seen at the beginning of a
72** statement, possibly preceeded by EXPLAIN and/or followed by
73** TEMP or TEMPORARY
74**
75** (4) TRIGGER We are in the middle of a trigger definition that must be
76** ended by a semicolon, the keyword END, and another semicolon.
77**
78** (5) SEMI We've seen the first semicolon in the ";END;" that occurs at
79** the end of a trigger definition.
80**
81** (6) END We've seen the ";END" of the ";END;" that occurs at the end
82** of a trigger difinition.
83**
84** Transitions between states above are determined by tokens extracted
85** from the input. The following tokens are significant:
86**
87** (0) tkSEMI A semicolon.
88** (1) tkWS Whitespace
89** (2) tkOTHER Any other SQL token.
90** (3) tkEXPLAIN The "explain" keyword.
91** (4) tkCREATE The "create" keyword.
92** (5) tkTEMP The "temp" or "temporary" keyword.
93** (6) tkTRIGGER The "trigger" keyword.
94** (7) tkEND The "end" keyword.
95**
96** Whitespace never causes a state transition and is always ignored.
97**
98** If we compile with SQLITE_OMIT_TRIGGER, all of the computation needed
99** to recognize the end of a trigger can be omitted. All we have to do
100** is look for a semicolon that is not part of an string or comment.
101*/
102int sqlite3_complete(const char *zSql){
103 u8 state = 0; /* Current state, using numbers defined in header comment */
104 u8 token; /* Value of the next token */
105
106#ifndef SQLITE_OMIT_TRIGGER
107 /* A complex statement machine used to detect the end of a CREATE TRIGGER
108 ** statement. This is the normal case.
109 */
110 static const u8 trans[7][8] = {
111 /* Token: */
112 /* State: ** SEMI WS OTHER EXPLAIN CREATE TEMP TRIGGER END */
113 /* 0 START: */ { 0, 0, 1, 2, 3, 1, 1, 1, },
114 /* 1 NORMAL: */ { 0, 1, 1, 1, 1, 1, 1, 1, },
115 /* 2 EXPLAIN: */ { 0, 2, 1, 1, 3, 1, 1, 1, },
116 /* 3 CREATE: */ { 0, 3, 1, 1, 1, 3, 4, 1, },
117 /* 4 TRIGGER: */ { 5, 4, 4, 4, 4, 4, 4, 4, },
118 /* 5 SEMI: */ { 5, 5, 4, 4, 4, 4, 4, 6, },
119 /* 6 END: */ { 0, 6, 4, 4, 4, 4, 4, 4, },
120 };
121#else
122 /* If triggers are not suppored by this compile then the statement machine
123 ** used to detect the end of a statement is much simplier
124 */
125 static const u8 trans[2][3] = {
126 /* Token: */
127 /* State: ** SEMI WS OTHER */
128 /* 0 START: */ { 0, 0, 1, },
129 /* 1 NORMAL: */ { 0, 1, 1, },
130 };
131#endif /* SQLITE_OMIT_TRIGGER */
132
133 while( *zSql ){
134 switch( *zSql ){
135 case ';': { /* A semicolon */
136 token = tkSEMI;
137 break;
138 }
139 case ' ':
140 case '\r':
141 case '\t':
142 case '\n':
143 case '\f': { /* White space is ignored */
144 token = tkWS;
145 break;
146 }
147 case '/': { /* C-style comments */
148 if( zSql[1]!='*' ){
149 token = tkOTHER;
150 break;
151 }
152 zSql += 2;
153 while( zSql[0] && (zSql[0]!='*' || zSql[1]!='/') ){ zSql++; }
154 if( zSql[0]==0 ) return 0;
155 zSql++;
156 token = tkWS;
157 break;
158 }
159 case '-': { /* SQL-style comments from "--" to end of line */
160 if( zSql[1]!='-' ){
161 token = tkOTHER;
162 break;
163 }
164 while( *zSql && *zSql!='\n' ){ zSql++; }
165 if( *zSql==0 ) return state==0;
166 token = tkWS;
167 break;
168 }
169 case '[': { /* Microsoft-style identifiers in [...] */
170 zSql++;
171 while( *zSql && *zSql!=']' ){ zSql++; }
172 if( *zSql==0 ) return 0;
173 token = tkOTHER;
174 break;
175 }
176 case '`': /* Grave-accent quoted symbols used by MySQL */
177 case '"': /* single- and double-quoted strings */
178 case '\'': {
179 int c = *zSql;
180 zSql++;
181 while( *zSql && *zSql!=c ){ zSql++; }
182 if( *zSql==0 ) return 0;
183 token = tkOTHER;
184 break;
185 }
186 default: {
187 int c;
188 if( IdChar((u8)*zSql) ){
189 /* Keywords and unquoted identifiers */
190 int nId;
191 for(nId=1; IdChar(zSql[nId]); nId++){}
192#ifdef SQLITE_OMIT_TRIGGER
193 token = tkOTHER;
194#else
195 switch( *zSql ){
196 case 'c': case 'C': {
197 if( nId==6 && sqlite3StrNICmp(zSql, "create", 6)==0 ){
198 token = tkCREATE;
199 }else{
200 token = tkOTHER;
201 }
202 break;
203 }
204 case 't': case 'T': {
205 if( nId==7 && sqlite3StrNICmp(zSql, "trigger", 7)==0 ){
206 token = tkTRIGGER;
207 }else if( nId==4 && sqlite3StrNICmp(zSql, "temp", 4)==0 ){
208 token = tkTEMP;
209 }else if( nId==9 && sqlite3StrNICmp(zSql, "temporary", 9)==0 ){
210 token = tkTEMP;
211 }else{
212 token = tkOTHER;
213 }
214 break;
215 }
216 case 'e': case 'E': {
217 if( nId==3 && sqlite3StrNICmp(zSql, "end", 3)==0 ){
218 token = tkEND;
219 }else
220#ifndef SQLITE_OMIT_EXPLAIN
221 if( nId==7 && sqlite3StrNICmp(zSql, "explain", 7)==0 ){
222 token = tkEXPLAIN;
223 }else
224#endif
225 {
226 token = tkOTHER;
227 }
228 break;
229 }
230 default: {
231 token = tkOTHER;
232 break;
233 }
234 }
235#endif /* SQLITE_OMIT_TRIGGER */
236 zSql += nId-1;
237 }else{
238 /* Operators and special symbols */
239 token = tkOTHER;
240 }
241 break;
242 }
243 }
244 state = trans[state][token];
245 zSql++;
246 }
247 return state==0;
248}
249
250#ifndef SQLITE_OMIT_UTF16
251/*
252** This routine is the same as the sqlite3_complete() routine described
253** above, except that the parameter is required to be UTF-16 encoded, not
254** UTF-8.
255*/
256int sqlite3_complete16(const void *zSql){
257 sqlite3_value *pVal;
258 char const *zSql8;
259 int rc = SQLITE_NOMEM;
260
261 pVal = sqlite3ValueNew(0);
262 sqlite3ValueSetStr(pVal, -1, zSql, SQLITE_UTF16NATIVE, SQLITE_STATIC);
263 zSql8 = sqlite3ValueText(pVal, SQLITE_UTF8);
264 if( zSql8 ){
265 rc = sqlite3_complete(zSql8);
266 }
267 sqlite3ValueFree(pVal);
268 return sqlite3ApiExit(0, rc);
269}
270#endif /* SQLITE_OMIT_UTF16 */
271#endif /* SQLITE_OMIT_COMPLETE */
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