public string Emit(Statement statement)
{
_text = new StringBuilder();
_indent = 0;
InternalEmit(statement);
return _text.ToString();
}
protected abstract void InternalEmit(Statement statement);
// protected virtual void EmitExpression(Expression expression)
// {
// if (expression is UnaryExpression)
// EmitUnaryExpression((UnaryExpression)expression);
// else if (expression is BinaryExpression)
// EmitBinaryExpression((BinaryExpression)expression);
// else if (expression is CallExpression)
// EmitCallExpression((CallExpression)expression);
// else if (expression is ValueExpression)
// EmitValueExpression((ValueExpression)expression);
// else if (expression is IdentifierExpression)
// EmitIdentifierExpression((IdentifierExpression)expression);
// else if (expression is CaseExpression)
// EmitCaseExpression((CaseExpression)expression);
// else if (expression is BetweenExpression)
// EmitBetweenExpression((BetweenExpression)expression);
// else
// throw new LanguageException(LanguageException.Codes.UnknownExpressionClass, expression == null ? "null" : expression.GetType().Name);
// }
// public static string OperatorToKeyword(Operator op)
// {
// switch (op)
// {
// case Operator.Not: return "not";
// case Operator.Negate: return "-";
// case Operator.BitwiseNot: return "~";
// case Operator.Exists: return "exists";
// case Operator.Addition: return "+";
// case Operator.Subtraction: return "-";
// case Operator.Multiplication: return "*";
// case Operator.Division: return "/";
// case Operator.Div: return "div";
// case Operator.Mod: return "mod";
// case Operator.Power: return "**";
// case Operator.Equal: return "=";
// case Operator.NotEqual: return "<>";
// case Operator.Less: return "<";
// case Operator.InclusiveLess: return "<=";
// case Operator.Greater: return ">";
// case Operator.InclusiveGreater: return ">=";
// case Operator.Compare: return "?=";
// case Operator.And: return "and";
// case Operator.Or: return "or";
// case Operator.Xor: return "xor";
// case Operator.In: return "in";
// case Operator.Like: return "like";
// case Operator.Matches: return "matches";
// case Operator.BitwiseAnd: return "&";
// case Operator.BitwiseOr: return "|";
// case Operator.BitwiseXor: return "^";
// case Operator.ShiftLeft: return "<<";
// case Operator.ShiftRight: return ">>";
// default: throw new LanguageException(LanguageException.Codes.UnknownInstruction, op.ToString());
// }
// }
// protected virtual string GetOperatorKeyword(Operator op)
// {
// return OperatorToKeyword(op);
// }
// protected virtual void EmitUnaryExpression(UnaryExpression expression)
// {
// AppendFormat("{0}{1}", GetOperatorKeyword(expression.Operator), "(");
// EmitExpression(expression.Expression);
// Append(")");
// }
// protected virtual void EmitBinaryExpression(BinaryExpression expression)
// {
// Append("(");
// EmitExpression(expression.LeftExpression);
// AppendFormat(" {0} ", GetOperatorKeyword(expression.Operator));
// EmitExpression(expression.RightExpression);
// Append(")");
// }
// protected virtual void EmitCallExpression(CallExpression expression)
// {
// AppendFormat("{0}{1}", expression.Identifier, "(");
// for (int index = 0; index < expression.Expressions.Count; index++)
// {
// if (index > 0)
// AppendFormat("{0} ", ",");
// EmitExpression(expression.Expressions[index]);
// }
// Append(")");
// }
// protected virtual void EmitBetweenExpression(BetweenExpression expression)
// {
// Append("(");
// EmitExpression(expression.Expression);
// Append(" between ");
// EmitExpression(expression.LowerExpression);
// Append(" and ");
// EmitExpression(expression.UpperExpression);
// Append(")");
// }
// protected virtual void EmitValueExpression(ValueExpression expression)
// {
// switch (expression.Token)
// {
// case TokenType.Null : Append(Keywords.Null); break;
// case TokenType.String : Append("'" + ((string)expression.Value).Replace("'", "''") + "'"); break;
// case TokenType.Decimal: Append(String.Format(System.Globalization.CultureInfo.InvariantCulture, "{0}d", expression.Value)); break;
// case TokenType.Money : Append(String.Format(System.Globalization.CultureInfo.InvariantCulture, "${0}", expression.Value)); break;
// case TokenType.Boolean : Append(((bool)expression.Value ? "true" : "false")); break;
// case TokenType.Hex: Append("0x" + ((long)expression.Value).ToString("X")); break;
// default : Append(String.Format(System.Globalization.CultureInfo.InvariantCulture, "{0}", expression.Value)); break;
// }
// }
// protected virtual void EmitIdentifierExpression(IdentifierExpression expression)
// {
// Append(expression.Identifier);
// }
// protected virtual void EmitCaseExpression(CaseExpression expression)
// {
// AppendFormat("{0}", "case");
// if (expression.Expression != null)
// {
// Append(" ");
// EmitExpression(expression.Expression);
// }
// for (int index = 0; index < expression.CaseItems.Count; index++)
// {
// AppendFormat(" {0} ", "when");
// EmitExpression(expression.CaseItems[index].WhenExpression);
// AppendFormat(" {0} ", "then");
// EmitExpression(expression.CaseItems[index].ThenExpression);
// }
// if (expression.ElseExpression != null)
// {
// AppendFormat(" {0} ", "else");
// EmitExpression(((CaseElseExpression)expression.ElseExpression).Expression);
// }
// AppendFormat(" {0}", "end");
// }
// protected virtual void EmitStatement(Statement statement)
// {
// throw new LanguageException(LanguageException.Codes.UnknownStatementClass, statement.GetType().Name);
// }
protected override void InternalEmit(Statement statement)
{
throw new NotImplementedException();
}