protected int Match(params MySQLToken[] expectToken)
{
if (expectToken == null || expectToken.Length <= 0)
{
throw new ArgumentException("at least one expect token");
}
MySQLToken token = lexer.Token();
for (int i = 0; i < expectToken.Length; ++i)
{
if (token == expectToken[i])
{
if (token != MySQLToken.EOF || i < expectToken.Length - 1)
{
lexer.NextToken();
}
return(i);
}
}
throw new ArgumentException("expect " + expectToken);
}
public static IStatement Parse(string sql, MySQLLexer lexer, string charset)
{
try
{
IStatement stmt;
bool isEOF = true;
MySQLExprParser exprParser = new MySQLExprParser(lexer, charset);
StmtSwitch:
switch (lexer.Token())
{
//TODO:之后加入DAL的解析后,要改
case MySQLToken.KW_SELECT:
case MySQLToken.PUNC_LEFT_PAREN:
stmt = new SelectStatement
goto StmtSwitch;
case MySQLToken.KW_DELETE:
goto StmtSwitch;
case MySQLToken.KW_INSERT:
goto StmtSwitch;
case MySQLToken.KW_REPLACE:
goto StmtSwitch;
case MySQLToken.KW_UPDATE:
goto StmtSwitch;
case MySQLToken.KW_CALL:
goto StmtSwitch;
case MySQLToken.KW_SET:
goto StmtSwitch;
case MySQLToken.KW_SHOW:
goto StmtSwitch;
case MySQLToken.KW_ALTER:
case MySQLToken.KW_CREATE:
case MySQLToken.KW_DROP:
case MySQLToken.KW_RENAME:
goto StmtSwitch;
case MySQLToken.KW_RELEASE:
goto StmtSwitch;
case MySQLToken.IDENTIFIER:
goto StmtSwitch;
default:
throw new SystemException("sql is not a supported statement");
}
if (isEOF)
{
while (lexer.Token() == MySQLToken.PUNC_SEMICOLON)
{
lexer.NextToken();
}
if (lexer.Token() != MySQLToken.EOF)
{
throw new SystemException("SQL syntax error!");
}
}
return(stmt);
}
catch (Exception ex)
{
throw new SystemException(BuildErrorMsg(ex, lexer, sql));
}
}