public IEnumerable <Instruction> Build(VariableDefinition variable) => Build(ValueSource.New().Variable(variable));
public ForEach(ModuleWeaver moduleWeaver, List <Instruction> instructions, TypeReference typeOfEnumerable, ValueSource source)
{
_moduleWeaver = moduleWeaver;
_instructions = instructions;
if (!typeOfEnumerable.TryFindImplementation(typeof(IEnumerable <>), out var typeOfEnumerableImpl))
{
throw new DeepCopyException($"{typeOfEnumerable.FullName} is no IEnumerable");
}
var typeOfCurrent = moduleWeaver.ImportType(((GenericInstanceType)typeOfEnumerableImpl).GenericArguments.Single());
var methodGetEnumerator = moduleWeaver.ImportMethod(moduleWeaver.ImportType(typeof(IEnumerable <>), typeOfCurrent), nameof(IEnumerable.GetEnumerator), typeOfCurrent);
_typeEnumerator = moduleWeaver.ImportType(methodGetEnumerator.ReturnType, typeOfCurrent);
_enumerator = moduleWeaver.NewVariable(_typeEnumerator);
Current = moduleWeaver.NewVariable(typeOfCurrent);
_instructions.AddRange(source);
_instructions.Add(Instruction.Create(OpCodes.Callvirt, methodGetEnumerator));
_instructions.Add(Instruction.Create(OpCodes.Stloc, _enumerator));
// try
_startCondition = Instruction.Create(OpCodes.Ldloc, _enumerator);
_startTry = Instruction.Create(OpCodes.Br, _startCondition);
_instructions.Add(_startTry);
_startLoop = Instruction.Create(OpCodes.Ldloc, _enumerator);
_instructions.Add(_startLoop);
_instructions.Add(Instruction.Create(OpCodes.Callvirt, moduleWeaver.ImportMethod(_typeEnumerator, CurrentGetter, typeOfCurrent)));
_instructions.Add(Instruction.Create(OpCodes.Stloc, Current));
}