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Code Issues Releases Wiki Activity

improve sql parser

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This commit is contained in:
wenshao
2012-11-10 16:34:24 +08:00
parent 8142739841
commit ccb314e3b8
7 changed files with 220 additions and 164 deletions
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src/main/java/com/alibaba/druid/sql/dialect/mysql/parser/MySqlLexer.java
+38 -45
View File
@@ -67,86 +67,76 @@ public class MySqlLexer extends Lexer {
throw new SQLParseException("illegal variable");
}
int hash = first;
np = bp;
sp = 1;
if (buf[bp + 1] == '@') {
ch = buf[++bp];
hash = 31 * hash + ch;
if (charAt(bp + 1) == '@') {
ch = charAt(++bp);
sp++;
}
if (buf[bp + 1] == '`') {
if (charAt(bp + 1) == '`') {
++bp;
++sp;
char ch;
for (;;) {
ch = buf[++bp];
ch = charAt(++bp);
if (ch == '`') {
sp++;
ch = buf[++bp];
ch = charAt(++bp);
break;
} else if (ch == EOI) {
throw new SQLParseException("illegal identifier");
}
hash = 31 * hash + ch;
sp++;
continue;
}
this.ch = buf[bp];
this.ch = charAt(bp);
stringVal = symbolTable.addSymbol(buf, np, sp, hash);
stringVal = subString(np, sp);
token = Token.VARIANT;
} else if (buf[bp + 1] == '{') {
} else if (charAt(bp + 1) == '{') {
++bp;
++sp;
char ch;
for (;;) {
ch = buf[++bp];
ch = charAt(++bp);
if (ch == '}') {
sp++;
ch = buf[++bp];
ch = charAt(++bp);
break;
} else if (ch == EOI) {
throw new SQLParseException("illegal identifier");
}
hash = 31 * hash + ch;
sp++;
continue;
}
this.ch = buf[bp];
this.ch = charAt(bp);
stringVal = symbolTable.addSymbol(buf, np, sp, hash);
stringVal = subString(np, sp);
token = Token.VARIANT;
} else {
for (;;) {
ch = buf[++bp];
ch = charAt(++bp);
if (!isIdentifierChar(ch)) {
break;
}
hash = 31 * hash + ch;
sp++;
continue;
}
}
this.ch = buf[bp];
this.ch = charAt(bp);
stringVal = symbolTable.addSymbol(buf, np, sp, hash);
stringVal = subString(np, sp);
token = Token.VARIANT;
}
@@ -154,31 +144,28 @@ public class MySqlLexer extends Lexer {
final char first = ch;
if (ch == '`') {
int hash = first;
np = bp;
sp = 1;
char ch;
for (;;) {
ch = buf[++bp];
ch = charAt(++bp);
if (ch == '`') {
sp++;
ch = buf[++bp];
ch = charAt(++bp);
break;
} else if (ch == EOI) {
throw new SQLParseException("illegal identifier");
}
hash = 31 * hash + ch;
sp++;
continue;
}
this.ch = buf[bp];
this.ch = charAt(bp);
stringVal = symbolTable.addSymbol(buf, np, sp, hash);
stringVal = subString(np, sp);
Token tok = keywods.getKeyword(stringVal);
if (tok != null) {
token = tok;
@@ -198,7 +185,7 @@ public class MySqlLexer extends Lexer {
sp = 1;
char ch;
for (;;) {
ch = buf[++bp];
ch = charAt(++bp);
if (!isIdentifierChar(ch)) {
break;
@@ -210,9 +197,9 @@ public class MySqlLexer extends Lexer {
continue;
}
this.ch = buf[bp];
this.ch = charAt(bp);
stringVal = symbolTable.addSymbol(buf, np, sp, hash);
stringVal = addSymbol(hash);
Token tok = keywods.getKeyword(stringVal);
if (tok != null) {
token = tok;
@@ -227,17 +214,20 @@ public class MySqlLexer extends Lexer {
boolean hasSpecial = false;
for (;;) {
if (bp >= buflen) {
if (isEOF()) {
lexError(tokenPos, "unclosed.str.lit");
return;
}
ch = buf[++bp];
ch = charAt(++bp);
if (ch == '\\') {
scanChar();
if (!hasSpecial) {
System.arraycopy(buf, np + 1, sbuf, 0, sp);
if (sbuf == null) {
sbuf = new char[32];
}
arraycopy(np + 1, sbuf, 0, sp);
hasSpecial = true;
}
@@ -282,7 +272,10 @@ public class MySqlLexer extends Lexer {
token = LITERAL_CHARS;
break;
} else {
System.arraycopy(buf, np + 1, sbuf, 0, sp);
if (sbuf == null) {
sbuf = new char[32];
}
arraycopy(np + 1, sbuf, 0, sp);
hasSpecial = true;
putChar('\'');
continue;
@@ -302,7 +295,7 @@ public class MySqlLexer extends Lexer {
}
if (!hasSpecial) {
stringVal = new String(buf, np + 1, sp);
stringVal = subString(np + 1, sp);
} else {
stringVal = new String(sbuf, 0, sp);
}
@@ -336,7 +329,7 @@ public class MySqlLexer extends Lexer {
}
for (;;) {
if (ch == '*' && buf[bp + 1] == '/') {
if (ch == '*' && charAt(bp + 1) == '/') {
sp += 2;
scanChar();
scanChar();
@@ -348,10 +341,10 @@ public class MySqlLexer extends Lexer {
}
if (isHint) {
stringVal = new String(buf, np + startHintSp, (sp - startHintSp) - 1);
stringVal = subString(np + startHintSp, (sp - startHintSp) - 1);
token = Token.HINT;
} else {
stringVal = new String(buf, np, sp);
stringVal = subString(np, sp);
token = Token.MULTI_LINE_COMMENT;
}
@@ -372,7 +365,7 @@ public class MySqlLexer extends Lexer {
for (;;) {
if (ch == '\r') {
if (buf[bp + 1] == '\n') {
if (charAt(bp + 1) == '\n') {
sp += 2;
scanChar();
break;
@@ -393,7 +386,7 @@ public class MySqlLexer extends Lexer {
sp++;
}
stringVal = new String(buf, np + 1, sp);
stringVal = subString(np + 1, sp);
token = Token.LINE_COMMENT;
return;
}