private void EmitUsingDefinitionValue(ILGenerator ilGenerator, FluentActionDefinition fluentActionDefinition, FluentActionUsingDefinition usingDefinition, Dictionary <int, int> methodParameterIndices, StateMachineState state, int stateIndex, int handlerInStateIndex)
{
if (usingDefinition.IsMethodParameter)
{
var usingDefinitionHash = usingDefinition.GetHashCode();
var methodParameterIndex = methodParameterIndices[usingDefinitionHash];
ilGenerator.Emit(OpCodes.Ldarg_0);
ilGenerator.Emit(OpCodes.Ldfld, MethodParameterFields[methodParameterIndex - 1]);
}
else if (usingDefinition.IsControllerProperty)
{
ilGenerator.Emit(OpCodes.Ldarg_0);
ilGenerator.Emit(OpCodes.Ldfld, ParentField);
ilGenerator.Emit(OpCodes.Callvirt,
typeof(Controller).GetProperty(usingDefinition.ControllerPropertyName).GetGetMethod());
}
else if (usingDefinition is FluentActionUsingPropertyDefinition)
{
var propertyName = ((FluentActionUsingPropertyDefinition)usingDefinition).PropertyName;
var parentType = fluentActionDefinition.ParentType ?? typeof(Controller);
var property = parentType.GetProperty(propertyName);
if (property == null)
{
throw new Exception($"Could not find property {propertyName} on type {parentType.FullName}.");
}
var propertyGetMethod = property.GetGetMethod();
if (propertyGetMethod == null)
{
throw new Exception($"Missing public get method on property {propertyName} on type {parentType.FullName}.");
}
ilGenerator.Emit(OpCodes.Ldarg_0);
ilGenerator.Emit(OpCodes.Ldfld, ParentField);
ilGenerator.Emit(OpCodes.Callvirt, propertyGetMethod);
}
else if (usingDefinition is FluentActionUsingParentDefinition)
{
ilGenerator.Emit(OpCodes.Ldarg_0);
ilGenerator.Emit(OpCodes.Ldfld, ParentField);
}
else if (usingDefinition is FluentActionUsingResultDefinition)
{
FieldBuilder resultFieldToLoad;
if (handlerInStateIndex > 0)
{
resultFieldToLoad = state.Handlers[handlerInStateIndex - 1].ResultField;
}
else
{
resultFieldToLoad = States[stateIndex - 1].ResultField;
}
ilGenerator.Emit(OpCodes.Ldarg_0);
ilGenerator.Emit(OpCodes.Ldfld, resultFieldToLoad);
if (resultFieldToLoad.FieldType.IsValueType)
{
ilGenerator.Emit(OpCodes.Box, resultFieldToLoad.FieldType);
}
}
else
{
throw new Exception($"Got unknown using definition: {usingDefinition.GetType()}");
}
}
private void EmitUsingDefinitionValue(
ILGenerator ilGenerator,
FluentActionUsingDefinition usingDefinition,
Dictionary <int, int> methodParameterIndices,
LocalBuilder localVariableForPreviousReturnValue)
{
var ilHandle = new IlHandle {
Generator = ilGenerator
};
var usingDefinitionHash = usingDefinition.GetHashCode();
var methodParameterIndex = methodParameterIndices.ContainsKey(usingDefinitionHash) ?
methodParameterIndices[usingDefinitionHash] : -1;
if (usingDefinition.IsMethodParameter)
{
ilHandle.Generator.Emit(OpCodes.Ldarg, methodParameterIndex);
}
else if (usingDefinition.IsControllerProperty)
{
ilHandle.Generator.Emit(OpCodes.Ldarg_0);
ilHandle.Generator.Emit(OpCodes.Callvirt,
typeof(Controller).GetProperty(usingDefinition.ControllerPropertyName).GetGetMethod());
}
else if (usingDefinition is FluentActionUsingPropertyDefinition)
{
var propertyName = ((FluentActionUsingPropertyDefinition)usingDefinition).PropertyName;
var parentType = FluentActionDefinition.ParentType ?? typeof(Controller);
var property = parentType.GetProperty(propertyName);
if (property == null)
{
throw new Exception($"Could not find property {propertyName} on type {parentType.FullName}.");
}
var propertyGetMethod = property.GetGetMethod();
if (propertyGetMethod == null)
{
throw new Exception($"Missing public get method on property {propertyName} on type {parentType.FullName}.");
}
ilHandle.Generator.Emit(OpCodes.Ldarg_0);
ilHandle.Generator.Emit(OpCodes.Callvirt, propertyGetMethod);
}
else if (usingDefinition is FluentActionUsingParentDefinition)
{
ilHandle.Generator.Emit(OpCodes.Ldarg_0);
}
else if (usingDefinition is FluentActionUsingResultDefinition)
{
if (localVariableForPreviousReturnValue == null)
{
throw new Exception("Cannot use previous result from handler as no previous result exists.");
}
ilHandle.Generator.Emit(OpCodes.Ldloc, localVariableForPreviousReturnValue);
if (localVariableForPreviousReturnValue.LocalType.IsValueType)
{
ilHandle.Generator.Emit(OpCodes.Box, localVariableForPreviousReturnValue.LocalType);
}
}
else
{
throw new Exception($"Got unknown using definition: {usingDefinition.GetType()}");
}
}
