public SqlStatement ParseDeleteTableStatement()
{
DeleteStatement StatementDelete = new DeleteStatement();
Token token = lexer.Get_Token();
Error error = new Error();
if (!(token.TokenType == TokenType.Keyword && token.Lexem == "SELECT"))
{
error.expected = "DROP";
error.str = "Create value expected";
error.type = "Keyword";
result.Errors.Add(error);
}
token = lexer.Get_Token();
if (!(token.TokenType == TokenType.Keyword && token.Lexem == "TABLE"))
{
error.expected = "TABLE";
error.str = "Table value expected";
error.type = "Keyword";
result.Errors.Add(error);
}
token = lexer.Get_Token();
if (token.TokenType != TokenType.ID)
{
error.expected = "Table name";
error.str = "Table title expected";
error.type = "ID";
result.Errors.Add(error);
}
StatementDelete.TableName = token.Lexem;
token = lexer.Get_Token();
if (token.TokenType == TokenType.ID && token.Lexem != "(")
{
error.expected = "(";
error.str = "Expected (";
error.type = "Bracket";
result.Errors.Add(error);
}
token = lexer.Get_Token();
while (true)
{
if (token.TokenType != TokenType.ID)
{
error.expected = "Column name";
error.str = "Expected column name";
error.type = "ID";
result.Errors.Add(error);
}
Expression columnDef;
columnDef.Operand1 = token.Lexem;
token = lexer.Get_Token();
if (token.TokenType != TokenType.Operation)
{
error.expected = "column type";
error.str = "Expected column type";
error.type = "TypeName";
result.Errors.Add(error);
}
columnDef.Operation = token.Lexem;
token = lexer.Get_Token();
if (token.TokenType != TokenType.Operation)
{
error.expected = "column type";
error.str = "Expected column type";
error.type = "TypeName";
result.Errors.Add(error);
}
columnDef.Operand2 = token.Lexem;
StatementDelete.set_columns(columnDef);
token = lexer.Get_Token();
if (token.TokenType == TokenType.Bracket)
{
break;
}
token = lexer.Get_Token();
}
token = lexer.Get_Token();
if (token.TokenType != TokenType.Semicolon)
{
error.expected = ";";
error.str = "Expected ;";
error.type = "Semicolon";
result.Errors.Add(error);
}
return(StatementDelete);
}
public abstract void visit(ref DeleteStatement DeleteStatement);
public override void visit(ref DeleteStatement DeleteStatement)
{
DeleteStatement.write_data();
}
public override void Accept(ref ExecuteVisitor visitor)
{
DeleteStatement DeleteStatement = this;
visitor.visit(ref DeleteStatement);
}