public LambdaExpression Decompiler(bool enableNullSafe)
{
LambdaExpression lambdaExpression = this.RegisterCore(enableNullSafe);
var newparameter1 = Expression.Variable(parameterTuple.Destination.Type, parameterTuple.Destination.Name);
var newparameter2 = Expression.Parameter(parameterTuple.Source.Type, parameterTuple.Source.Name);
var newparameter3 = Expression.Parameter(parameterTuple.ErrorMsg.Type.MakeByRefType(), parameterTuple.ErrorMsg.Name);
ParameterTuple newParameterTuple = new ParameterTuple(newparameter1, newparameter2, newparameter3);
var body = this.Body;
var newBody = ParameterReplacer.Replace(body, parameterTuple.Collect().ToArray(), newParameterTuple.Collect().ToArray()) as BlockExpression;
ReturnTargetRewriter returnTargetRewriter = null;
if (hasReturnLabel)
{
returnTargetRewriter = new ReturnTargetRewriter(parameterTuple.Destination.Type, Expression.Default(parameterTuple.Destination.Type));
newBody = returnTargetRewriter.Visit(newBody) as BlockExpression;
}
//初始化临时变量并构造新的lambda表达式
//去掉原来lambda表达式最后的return true
var initExpression = Expression.Assign(newparameter1, Expression.New(newparameter1.Type));
Expression returnExpression = null;
int exprCount = newBody.Expressions.Count - 1;
if (hasReturnLabel)
{
returnExpression = Expression.Label(returnTargetRewriter.LabelTarget, returnTargetRewriter.DefaultValue);
++exprCount;
}
else
{
returnExpression = newparameter1;
}
var newBlockExpression = Expression.Block(new[] { newparameter1 }.Concat(newBody.Variables), new[] { initExpression }.Concat(newBody.Expressions.Take(exprCount)).Concat(new[] { returnExpression }));
return(Expression.Lambda(newBlockExpression, newParameterTuple.Source, newParameterTuple.ErrorMsg));
}
public Option(ParameterTuple parameterTuple)
{
_parameterTuple = parameterTuple;
}
