ConditionExpression ParseRelationalExpression()
{
ConditionExpression e = ParseFactorExpression();
Token opToken;
RelationOperator op;
if (tokenizer.IsToken(TokenType.Less) ||
tokenizer.IsToken(TokenType.Greater) ||
tokenizer.IsToken(TokenType.Equal) ||
tokenizer.IsToken(TokenType.NotEqual) ||
tokenizer.IsToken(TokenType.LessOrEqual) ||
tokenizer.IsToken(TokenType.GreaterOrEqual))
{
opToken = tokenizer.Token;
tokenizer.GetNextToken();
switch (opToken.Type)
{
case TokenType.Equal:
op = RelationOperator.Equal;
break;
case TokenType.NotEqual:
op = RelationOperator.NotEqual;
break;
case TokenType.Less:
op = RelationOperator.Less;
break;
case TokenType.LessOrEqual:
op = RelationOperator.LessOrEqual;
break;
case TokenType.Greater:
op = RelationOperator.Greater;
break;
case TokenType.GreaterOrEqual:
op = RelationOperator.GreaterOrEqual;
break;
default:
throw new ExpressionParseException(String.Format("Wrong relation operator {0}", opToken.Value));
}
e = new ConditionRelationalExpression(e, ParseFactorExpression(), op);
}
return(e);
}
ConditionExpression ParseRelationalExpression ()
{
ConditionExpression e = ParseFactorExpression ();
Token opToken;
RelationOperator op;
if (tokenizer.IsToken (TokenType.Less) ||
tokenizer.IsToken (TokenType.Greater) ||
tokenizer.IsToken (TokenType.Equal) ||
tokenizer.IsToken (TokenType.NotEqual) ||
tokenizer.IsToken (TokenType.LessOrEqual) ||
tokenizer.IsToken (TokenType.GreaterOrEqual)) {
opToken = tokenizer.Token;
tokenizer.GetNextToken ();
switch (opToken.Type) {
case TokenType.Equal:
op = RelationOperator.Equal;
break;
case TokenType.NotEqual:
op = RelationOperator.NotEqual;
break;
case TokenType.Less:
op = RelationOperator.Less;
break;
case TokenType.LessOrEqual:
op = RelationOperator.LessOrEqual;
break;
case TokenType.Greater:
op = RelationOperator.Greater;
break;
case TokenType.GreaterOrEqual:
op = RelationOperator.GreaterOrEqual;
break;
default:
throw new ExpressionParseException (String.Format ("Wrong relation operator {0}", opToken.Value));
}
e = new ConditionRelationalExpression (e, ParseFactorExpression (), op);
}
return e;
}
