private boolean parseString(char quote) throws SQLParserException {
int i = offset + 1;
StringBuffer sb = new StringBuffer();
while (i < source.length()) {
char ch = source.charAt(i);
if (ch == quote) {
tokenType = TokenType.String;
start = offset;
end = i;
tokenString = sb.toString();
offset = i + 1;
return true;
} else if (strategy.isEscapeChar(ch)) {
int j = strategy.unescapeString(source, i, sb);
if (j <= i) throw new SQLParserException();
i = j;
} else {
sb.append(ch);
i++;
}
}
throw new SQLParserException();
}
public boolean next() throws SQLParserException {
char ch;
while (offset < source.length() && source.charAt(offset) == ' ') offset++;
if (offset >= source.length()) return false;
ch = source.charAt(offset);
if (strategy.isIdentStart(ch)) {
return parseIdent();
} else if (strategy.isQuoteStart(ch)) {
return parseString(ch);
} else if (strategy.isIdentQuoteStart(ch)) {
if (++offset >= source.length()) throw new SQLParserException();
if (!strategy.isIdentStart(source.charAt(offset))) {
throw new SQLParserException();
}
if (!parseIdent()) {
throw new SQLParserException();
}
tokenType = TokenType.QuotedIdentifier;
if (offset >= source.length() || ch != source.charAt(offset)) {
throw new SQLParserException();
}
offset++;
return true;
} else if (strategy.isNumberStart(ch)) {
if (parseNumber()) return true;
// should only be '.' here
if (strategy.isDelimiterStart(ch)) {
return parseDelimiter();
} else if (strategy.isOperatorStart(ch)) {
return parseOperator();
}
} else if (strategy.isDelimiterStart(ch)) {
return parseDelimiter();
} else if (strategy.isOperatorStart(ch)) {
return parseOperator();
} else {
throw new SQLParserException();
}
return false;
}
private boolean parseNumber() throws SQLParserException {
char leader = source.charAt(offset);
boolean isFloat = (leader == '.');
int i = offset + 1;
if (i >= source.length()) {
if (isFloat) return false;
tokenType = TokenType.Number;
start = offset;
end = offset = i;
tokenString = null;
return true;
}
char ch = source.charAt(i);
if (leader == '0') {
if (strategy.isOctalNumber(ch)) {
return parseOctalNumber();
} else if (ch == 'x') {
return parseHexNumber();
}
} else if (leader == '.' && !strategy.isDecNumber(ch)) {
return false;
}
while (i < source.length()) {
ch = source.charAt(i);
if (ch == '.') {
if (isFloat) break;
else isFloat = true;
} else if (!strategy.isDecNumber(ch)) {
break;
}
i++;
}
tokenType = TokenType.Number;
start = offset;
end = offset = i;
tokenString = null;
return true;
}
private boolean parseOperator() {
int i = strategy.matchesOperator(source, offset);
if (i <= offset) return false;
tokenType = TokenType.Operator;
start = offset;
end = offset = i;
tokenString = null;
return true;
}
private boolean parseIdent() {
int i = offset + 1;
while (i < source.length() && strategy.isIdentChar(source.charAt(i))) {
i++;
}
tokenType = TokenType.Identifier;
start = offset;
end = offset = i;
tokenString = null;
return true;
}
private boolean parseHexNumber() throws SQLParserException {
int i = offset + 2;
while (i < source.length() && strategy.isHexNumber(source.charAt(i))) i++;
if (i == offset + 2) throw new SQLParserException();
tokenType = TokenType.Number;
start = offset;
end = offset = i;
tokenString = null;
return true;
}