private static BlockExpression GetLoopBody(
IPopulationLoopData loopData,
EnumerablePopulationBuilder builder,
Expression breakLoop,
Expression elementPopulation)
{
var ifExitCheckBreakLoop = Expression.IfThen(loopData.LoopExitCheck, breakLoop);
var counterIncrement = builder.GetCounterIncrement();
if (elementPopulation.NodeType != ExpressionType.Block)
{
return(Expression.Block(ifExitCheckBreakLoop, elementPopulation, counterIncrement));
}
var elementPopulationBlock = (BlockExpression)elementPopulation;
var loopExpressions = new Expression[elementPopulationBlock.Expressions.Count + 2];
loopExpressions[0] = ifExitCheckBreakLoop;
loopExpressions.CopyFrom(elementPopulationBlock.Expressions, startIndex: 1);
loopExpressions[loopExpressions.Length - 1] = counterIncrement;
return(elementPopulationBlock.Variables.Any()
? Expression.Block(elementPopulationBlock.Variables, loopExpressions)
: Expression.Block(loopExpressions));
}
public static Expression BuildPopulationLoop <TLoopData>(
this TLoopData loopData,
EnumerablePopulationBuilder builder,
IObjectMappingData mappingData,
Func <TLoopData, IObjectMappingData, Expression> elementPopulationFactory)
where TLoopData : IPopulationLoopData
{
// TODO: Not all enumerable mappings require the Counter
var breakLoop = Expression.Break(Expression.Label(typeof(void), "Break"));
var elementPopulation = elementPopulationFactory.Invoke(loopData, mappingData);
var loopBody = Expression.Block(
Expression.IfThen(loopData.LoopExitCheck, breakLoop),
elementPopulation,
builder.GetCounterIncrement());
var populationLoop = loopData.NeedsContinueTarget
? Expression.Loop(loopBody, breakLoop.Target, loopData.ContinueLoopTarget)
: Expression.Loop(loopBody, breakLoop.Target);
var adaptedLoop = loopData.Adapt(populationLoop);
var population = Expression.Block(
new[] { builder.Counter },
builder.Counter.AssignTo(ToNumericConverter <int> .Zero),
adaptedLoop);
return(population);
}