private GenericExpressionNode Factor(string expression)
{
// Checks for TokenTypes String, Numeric, Property, ItemMetadata, and ItemList.
GenericExpressionNode arg = this.Arg(expression);
// If it's one of those, return it.
if (arg != null)
{
return arg;
}
// If it's not one of those, check for other TokenTypes.
Token current = lexer.CurrentToken;
if (Same(expression, Token.TokenType.Function))
{
if (!Same(expression, Token.TokenType.LeftParenthesis))
{
errorPosition = lexer.GetErrorPosition();
ProjectErrorUtilities.VerifyThrowInvalidProject(false, this.conditionAttribute, "UnexpectedTokenInCondition", lexer.IsNextString(), errorPosition);
return null;
}
ArrayList arglist = new ArrayList();
Arglist(expression, arglist);
if (!Same(expression, Token.TokenType.RightParenthesis))
{
errorPosition = lexer.GetErrorPosition();
ProjectErrorUtilities.VerifyThrowInvalidProject(false, this.conditionAttribute, "UnexpectedTokenInCondition", expression, lexer.IsNextString(), errorPosition);
return null;
}
return new FunctionCallExpressionNode( current.String, arglist);
}
else if (Same(expression, Token.TokenType.LeftParenthesis))
{
GenericExpressionNode child = Expr(expression);
if (Same(expression, Token.TokenType.RightParenthesis))
return child;
else
{
errorPosition = lexer.GetErrorPosition();
ProjectErrorUtilities.VerifyThrowInvalidProject(false, this.conditionAttribute, "UnexpectedTokenInCondition", expression, lexer.IsNextString(), errorPosition);
}
}
else if (Same(expression, Token.TokenType.Not))
{
OperatorExpressionNode notNode = new NotExpressionNode();
GenericExpressionNode expr = Factor(expression);
if (expr == null)
{
errorPosition = lexer.GetErrorPosition();
ProjectErrorUtilities.VerifyThrowInvalidProject(false, this.conditionAttribute, "UnexpectedTokenInCondition", expression, lexer.IsNextString(), errorPosition);
}
notNode.LeftChild = expr;
return notNode;
}
else
{
errorPosition = lexer.GetErrorPosition();
ProjectErrorUtilities.VerifyThrowInvalidProject(false, this.conditionAttribute, "UnexpectedTokenInCondition", expression, lexer.IsNextString(), errorPosition);
}
return null;
}
private GenericExpressionNode Factor(string expression)
{
// Checks for TokenTypes String, Numeric, Property, ItemMetadata, and ItemList.
GenericExpressionNode arg = this.Arg(expression);
// If it's one of those, return it.
if (arg != null)
{
return(arg);
}
// If it's not one of those, check for other TokenTypes.
Token current = lexer.CurrentToken;
if (Same(expression, Token.TokenType.Function))
{
if (!Same(expression, Token.TokenType.LeftParenthesis))
{
errorPosition = lexer.GetErrorPosition();
ProjectErrorUtilities.VerifyThrowInvalidProject(false, this.conditionAttribute, "UnexpectedTokenInCondition", lexer.IsNextString(), errorPosition);
return(null);
}
ArrayList arglist = new ArrayList();
Arglist(expression, arglist);
if (!Same(expression, Token.TokenType.RightParenthesis))
{
errorPosition = lexer.GetErrorPosition();
ProjectErrorUtilities.VerifyThrowInvalidProject(false, this.conditionAttribute, "UnexpectedTokenInCondition", expression, lexer.IsNextString(), errorPosition);
return(null);
}
return(new FunctionCallExpressionNode(current.String, arglist));
}
else if (Same(expression, Token.TokenType.LeftParenthesis))
{
GenericExpressionNode child = Expr(expression);
if (Same(expression, Token.TokenType.RightParenthesis))
{
return(child);
}
else
{
errorPosition = lexer.GetErrorPosition();
ProjectErrorUtilities.VerifyThrowInvalidProject(false, this.conditionAttribute, "UnexpectedTokenInCondition", expression, lexer.IsNextString(), errorPosition);
}
}
else if (Same(expression, Token.TokenType.Not))
{
OperatorExpressionNode notNode = new NotExpressionNode();
GenericExpressionNode expr = Factor(expression);
if (expr == null)
{
errorPosition = lexer.GetErrorPosition();
ProjectErrorUtilities.VerifyThrowInvalidProject(false, this.conditionAttribute, "UnexpectedTokenInCondition", expression, lexer.IsNextString(), errorPosition);
}
notNode.LeftChild = expr;
return(notNode);
}
else
{
errorPosition = lexer.GetErrorPosition();
ProjectErrorUtilities.VerifyThrowInvalidProject(false, this.conditionAttribute, "UnexpectedTokenInCondition", expression, lexer.IsNextString(), errorPosition);
}
return(null);
}