public override System.Linq.Expressions.Expression Transform()
{
var transformedExp = Expression.TransformRead();
var transformedCases = Cases.Select(x => x.Transform()).ToArray();
var hiddenVar = System.Linq.Expressions.Expression.Variable(typeof(object), "__switchVariable__");
List <System.Linq.Expressions.Expression> exp = new List <System.Linq.Expressions.Expression>();
exp.Add(System.Linq.Expressions.Expression.Assign(hiddenVar, transformedExp));
var defaultIndex = Cases.FindIndex(x => x.ContainsDefault);
var builder = Microsoft.Scripting.Ast.Utils.If();
for (int i = 0; i < transformedCases.Length; i++)
{
if (transformedCases[i].Item1.Length > 0)
{
var test = LanguageContext.Convert(BinaryExpression.TransformSimpleOperation(LanguageContext, hiddenVar, transformedCases[i].Item1[0], BinaryOperator.Equal), typeof(bool));
for (int j = 1; j < transformedCases[i].Item1.Length; i++)
{
test = System.Linq.Expressions.Expression.OrElse(test, LanguageContext.Convert(BinaryExpression.TransformSimpleOperation(LanguageContext, hiddenVar, transformedCases[i].Item1[i], BinaryOperator.Equal), typeof(bool)));
}
builder.ElseIf(test, System.Linq.Expressions.Expression.Goto(Cases[i].CaseLabel));
}
}
exp.Add(builder.Else(System.Linq.Expressions.Expression.Goto(defaultIndex >= 0 ? Cases[defaultIndex].CaseLabel : BreakLabel)));
for (int i = 0; i < transformedCases.Length; i++)
{
exp.Add(System.Linq.Expressions.Expression.Label(Cases[i].CaseLabel));
foreach (var transformedStatement in transformedCases[i].Item2)
{
exp.Add(transformedStatement);
}
}
exp.Add(System.Linq.Expressions.Expression.Label(BreakLabel));
return(System.Linq.Expressions.Expression.Block(new[] { hiddenVar }, exp));
}