/// <summary>
/// Visit a function expression
/// </summary>
/// <param name="expression">The expression</param>
/// <exception cref="ArgumentNullException">Thrown when the input parameter is null</exception>
public void Visit(FunctionExpression expression)
{
if (expression == null)
{
throw new ArgumentNullException("expression");
}
expression.Expression.Accept(this);
object param = result;
if (expression.FunctionName == "sizeof")
{
string customTypeName;
int symbolValue;
if (param is string)
{
if ((context.TryResolveCustomType((string)param, out customTypeName) &&
!DatatypeInfoProvider.IsPredefinedDatatype(customTypeName)) ||
param.ToString().StartsWith("enum", StringComparison.OrdinalIgnoreCase) ||
param.ToString().StartsWith("struct", StringComparison.OrdinalIgnoreCase) ||
param.ToString().StartsWith("union", StringComparison.OrdinalIgnoreCase))
{
result = "sizeof(" + param.ToString() + ")";
}
else
{
result = DatatypeInfoProvider.GetRpcDatatypeLength((string)param);
}
}
else if (context.TryResolveSymbol(expression.Text, out symbolValue))
{
Type value = param.GetType();
string typeName = String.Empty;
switch (value.ToString())
{
case "System.Char":
typeName = "char";
break;
case "System.Byte":
typeName = "byte";
break;
case "System.Int16":
typeName = "short";
break;
case "System.Int32":
typeName = "int";
break;
case "System.Boolean":
typeName = "boolean";
break;
default:
break;
}
result = DatatypeInfoProvider.GetRpcDatatypeLength(typeName);
}
if (result is int &&
(int)result <= 0)
{
throw new ExpressionEvaluatorException(
string.Format(CultureInfo.InvariantCulture, "cannot get the datatype length for the datatype '{0}'", param));
}
}
}
/// <summary>
/// The Literal operation
/// </summary>
/// <returns>An expression node created based on the operation</returns>
protected ExpressionNode Literal()
{
if (currentToken.Text.Length > 0)
{
if (currentToken.Type == TokenType.Integer)
{
int res;
if (TryConvertNumber(currentToken.Text, out res))
{
ExpressionNode integer = new ExpressionNode(
new Token(TokenType.Integer, res.ToString()));
GetNextToken();
return(integer);
}
else
{
throw new ExpressionEvaluatorException(
String.Format("invalid number '{0}'", currentToken.Text));
}
}
else if (currentToken.Type == TokenType.String)
{
int x;
if (!context.TryResolveSymbol(currentToken.Text, out x))
{
string tokenText = currentToken.Text;
while (true)
{
if (context.Variables != null &&
!context.Variables.ContainsKey(currentToken.Text) &&
!DatatypeInfoProvider.IsPredefinedDatatype(currentToken.Text) &&
!DatatypeInfoProvider.isPredefinedModifier(currentToken.Text))
{
string typeInfo;
if (context.TryResolveCustomType(currentToken.Text, out typeInfo))
{
tokenText = typeInfo;
break;
}
else
{
context.ReportError(
String.Format("cannot resolve symbol '{0}'", currentToken.Text));
break;
}
}
if (context.Variables != null &&
context.Variables.ContainsKey(currentToken.Text))
{
tokenText = currentToken.Text;
break;
}
// treat predefinedModifier as empty node
if (DatatypeInfoProvider.isPredefinedModifier(currentToken.Text))
{
GetNextToken();
}
else if (DatatypeInfoProvider.IsPredefinedDatatype(currentToken.Text))
{
tokenText = currentToken.Text;
break;
}
}
// in order to get pointer type size and avoid related issue
bool isPointerType = false;
GetNextToken();
if (isInSizeOf)
{
while (currentToken.Text == "*")
{
GetNextToken();
isPointerType = true;
}
}
if (isPointerType)
{
ExpressionNode integer = new ExpressionNode(
new Token(TokenType.Integer, "4"));
return(integer);
}
ExpressionNode variable = new ExpressionNode(
new Token(TokenType.Variable, tokenText));
return(variable);
}
else if (isInSizeOf)
{
string tokenText = currentToken.Text;
GetNextToken();
//ignoring other expression
while (currentToken.Text != ")")
{
GetNextToken();
}
return(new ExpressionNode(
new Token(TokenType.Variable, tokenText)));
}
else
{
GetNextToken();
return(new ExpressionNode(
new Token(TokenType.Integer, x.ToString())));
}
}
else
{
throw new ExpressionEvaluatorException(
String.Format("unexpected token '{0}'", currentToken));
}
}
else
{
throw new ExpressionEvaluatorException("unexpected end of input");
}
}