public void accept(Token token) {
if (lexer.token() == token) {
lexer.nextToken();
} else {
setErrorEndPos(lexer.pos());
throw new ParserException(
"syntax error, expect "
+ token
+ ", actual "
+ lexer.token()
+ " "
+ lexer.stringVal()
+ ", pos "
+ this.lexer.pos());
}
}
public void test_lexer() throws Exception {
String sql = "SELECT * FROM T WHERE F1 = ? ORDER BY F2";
Lexer lexer = new Lexer(sql);
for (; ; ) {
lexer.nextToken();
Token tok = lexer.token();
if (tok == Token.IDENTIFIER) {
System.out.println(tok.name() + "\t\t" + lexer.stringVal());
} else if (tok == Token.LITERAL_INT) {
System.out.println(tok.name() + "\t\t" + lexer.numberString());
} else {
System.out.println(tok.name() + "\t\t\t" + tok.name);
}
if (tok == Token.EOF) {
break;
}
}
}
protected String as() {
String alias = null;
if (lexer.token() == Token.AS) {
lexer.nextToken();
if (lexer.token() == Token.LITERAL_ALIAS) {
alias = '"' + lexer.stringVal() + '"';
lexer.nextToken();
} else if (lexer.token() == Token.IDENTIFIER) {
alias = lexer.stringVal();
lexer.nextToken();
} else if (lexer.token() == Token.LITERAL_CHARS) {
alias = "'" + lexer.stringVal() + "'";
lexer.nextToken();
} else {
switch (lexer.token()) {
case KEY:
case INDEX:
case CASE:
case MODEL:
case PCTFREE:
case INITRANS:
case MAXTRANS:
case SEGMENT:
case CREATION:
case IMMEDIATE:
case DEFERRED:
case STORAGE:
case NEXT:
case MINEXTENTS:
case MAXEXTENTS:
case MAXSIZE:
case PCTINCREASE:
case FLASH_CACHE:
case CELL_FLASH_CACHE:
case KEEP:
case NONE:
case LOB:
case STORE:
case ROW:
case CHUNK:
case CACHE:
case NOCACHE:
case LOGGING:
case NOCOMPRESS:
case KEEP_DUPLICATES:
case EXCEPTIONS:
case PURGE:
case INITIALLY:
case END:
case COMMENT:
case ENABLE:
case DISABLE:
case SEQUENCE:
case USER:
case ANALYZE:
case OPTIMIZE:
case GRANT:
alias = lexer.stringVal();
lexer.nextToken();
return alias;
case QUES:
alias = "?";
lexer.nextToken();
default:
break;
}
}
if (alias != null) {
while (lexer.token() == Token.DOT) {
lexer.nextToken();
alias += ('.' + lexer.token().name());
lexer.nextToken();
}
return alias;
}
if (lexer.token() == Token.LPAREN) {
return null;
}
throw new ParserException("Error : " + lexer.token());
}
if (lexer.token() == Token.LITERAL_ALIAS) {
alias = '"' + lexer.stringVal() + '"';
lexer.nextToken();
} else if (lexer.token() == Token.IDENTIFIER) {
alias = lexer.stringVal();
lexer.nextToken();
} else if (lexer.token() == Token.LITERAL_CHARS) {
alias = "'" + lexer.stringVal() + "'";
lexer.nextToken();
} else if (lexer.token() == Token.CASE) {
alias = lexer.token.name();
lexer.nextToken();
}
switch (lexer.token()) {
case KEY:
alias = lexer.token().name();
lexer.nextToken();
return alias;
default:
break;
}
return alias;
}
protected boolean identifierEquals(String text) {
return lexer.token() == Token.IDENTIFIER && lexer.stringVal().equalsIgnoreCase(text);
}
public void match(Token token) {
if (lexer.token() != token) {
throw new ParserException(
"syntax error, expect " + token + ", actual " + lexer.token() + " " + lexer.stringVal());
}
}
