public static IEnumerable <IExpressionValue> GetListOfParameterExpressionValues(IInterpretationController controller, QueryMemory queryMemory, SyneryParser.RequestExpressionListContext context)
{
if (context != null)
{
return(controller.Interpret <SyneryParser.RequestExpressionListContext, IList <IExpressionValue>, QueryMemory>(context, queryMemory));
}
else
{
return(new List <IExpressionValue>());
}
}
public static IList <IValue> GetListOfParameterValues(IInterpretationController controller, SyneryParser.ExpressionListContext context)
{
if (context != null)
{
return(controller.Interpret <SyneryParser.ExpressionListContext, IList <IValue> >(context));
}
else
{
return(new List <IValue>());
}
}
public static void InterpretHandleBlock(IInterpretationController controller, IHandleBlockData data, IValue eventRecord)
{
SyneryParser.BlockContext blockContext = data.Context as SyneryParser.BlockContext;
if (blockContext != null)
{
// create a new block scope and set the parent scope of the OBSERVE-block as parent
INestedScope blockScope = new BlockScope(data.ParentScope);
// add the event record as local variable
blockScope.DeclareVariable(data.ParameterName, eventRecord.Type);
blockScope.AssignVariable(data.ParameterName, eventRecord.Value);
// start interpreting the given HANDLE-block
controller.Interpret <SyneryParser.BlockContext, INestedScope, INestedScope>(blockContext, blockScope);
}
else
{
throw new SyneryException("Can not interpret handle block because the given context is not a BlockContext");
}
}
/// <summary>
/// Executes the function from the given <paramref name="functionData"/> using the given <paramref name="controller"/> and by setting the <paramref name="listOfParameters"/> as local scope variables.
/// </summary>
/// <param name="controller">the controller that is used to interpret the function</param>
/// <param name="functionData">contains the data for the function that should be executed</param>
/// <param name="listOfParameters"></param>
/// <param name="functionCallContext">the synery context where the function is called (only used in exceptions)</param>
/// <returns>the return value may be null if the function definition says HasReturnValue=false</returns>
public static IValue ExecuteSyneryFunction(IInterpretationController controller, IFunctionData functionData, object[] listOfParameters, Antlr4.Runtime.ParserRuleContext functionCallContext)
{
IValue returnValue;
IDictionary <string, IValue> scopeVariables = new Dictionary <string, IValue>();
int sizeOfSignatureParameters = functionData.FunctionDefinition.Parameters.Count;
int sizeOfListOfParameters = listOfParameters.Count();
// prepare the parameters as local scope variables
for (int i = 0; i < sizeOfSignatureParameters; i++)
{
object variableValue = null;
string variableName = functionData.FunctionDefinition.Parameters[i].Name;
SyneryType variableType = functionData.FunctionDefinition.Parameters[i].Type;
if (sizeOfListOfParameters >= (i + 1) &&
listOfParameters[i] != null)
{
variableValue = listOfParameters[i];
}
else if (functionData.FunctionDefinition.Parameters[i].DefaultValue != null)
{
variableValue = functionData.FunctionDefinition.Parameters[i].DefaultValue.Value;
}
scopeVariables.Add(variableName, new TypedValue(variableType, variableValue));
}
// start executing the function context
if (functionData.Context is SyneryParser.BlockContext)
{
/* 1. Create scope for the function block with the given parameters set as variables.
* Set the global scope as parent to avoid accessing variables of this scope.
* 2. Execute the function block.
* 3. Get the return value from the function block.
*/
IFunctionScope functionScope = new FunctionScope(controller.Memory.GlobalScope, functionData, scopeVariables);
controller.Interpret <SyneryParser.BlockContext, INestedScope, INestedScope>((SyneryParser.BlockContext)functionData.Context, functionScope);
returnValue = functionScope.ReturnValue;
}
else
{
throw new SyneryInterpretationException(functionData.Context, "Unknown function content cannot be interpreted.");
}
// validate the return value
if (functionData.FunctionDefinition.HasReturnValue == true && returnValue == null)
{
string message = String.Format(
"Function has no return value but is expected to return '{0}'. Function called on line: '{1}'.",
functionData.FunctionDefinition.ReturnType.PublicName,
functionCallContext.Start.Line);
throw new SyneryInterpretationException(functionData.Context, message);
}
else if (functionData.FunctionDefinition.HasReturnValue == true &&
functionData.FunctionDefinition.ReturnType != returnValue.Type)
{
string message = String.Format(
"Function has wrong return value. Expected: '{0}' / Given: '{1}'. Function called on line: '{2}'.",
functionData.FunctionDefinition.ReturnType.PublicName,
returnValue.Type.PublicName,
functionCallContext.Start.Line);
throw new SyneryInterpretationException(functionData.Context, message);
}
return(returnValue);
}