/// <summary>
/// Checks if a variable with the given identifier is
/// available in the dictionary or the related wider
/// scopes.
/// </summary>
/// <param name="strIdentifier">True if the variable
/// is declared, or false otherwise.</param>
/// <returns></returns>
public bool IsDeclared(String strIdentifier)
{
switch (m_variableScope)
{
case VariableScope.Global:
return(m_dictVariables.ContainsKey(strIdentifier));
case VariableScope.Script:
if (m_dictVariables.ContainsKey(strIdentifier))
{
return(true);
}
else
{
return(m_variableDicitonaryGlobal.IsDeclared(strIdentifier));
}
case VariableScope.Local:
if (m_dictVariables.ContainsKey(strIdentifier))
{
return(true);
}
else
{
return(m_variableDicitonaryScript.IsDeclared(strIdentifier));
}
default:
throw new ExecutionException("Variable scope '"
+ m_variableScope + "' not supported.");
}
}
private void AssignVariable(Operand operandDest, object objectValue)
{
// dest id
String strIdentifierDest = (String)operandDest.Value;
switch (operandDest.Type)
{
case OperandType.Variable:
// copy value (or assoc array ref)
m_variableDictionaryLocal[strIdentifierDest]
= objectValue;
break;
case OperandType.LiteralIndexedVariable:
case OperandType.VariableIndexedVariable:
// copy into array element
AssociativeArray associativeArray = null;
// dest value
object objectValueDest = null;
if (m_variableDictionaryLocal.IsDeclared(strIdentifierDest))
{
objectValueDest
= m_variableDictionaryLocal[strIdentifierDest];
}
else
{
objectValueDest = NullReference.Instance;
}
if (objectValueDest.GetType() != typeof(AssociativeArray))
{
// if old type not array and non-null assigned, throw error
throw new ExecutionException("Indexed destination "
+ operandDest + " is not an associative array.");
}
else
{
associativeArray = (AssociativeArray)objectValueDest;
}
// assign into array
if (operandDest.Type == OperandType.LiteralIndexedVariable)
{
// literal-indexed array
object objectIndex = operandDest.IndexLiteral;
associativeArray[objectIndex] = objectValue;
}
else
{
// variable-indexed arrau
String strIdentifierIndex = operandDest.IndexIdentifier;
object objectIndex = m_variableDictionaryLocal[strIdentifierIndex];
associativeArray[objectIndex] = objectValue;
}
break;
case OperandType.Literal:
throw new ExecutionException("MOV destination operand cannot be a literal.");
}
}