public static ExpressionSyntax TryRewrite(ValueBridge collection, TypeSyntax returnType, List <LinqStep> chain, InvocationExpressionSyntax node)
{
using var design = RewriteParametersFactory.BorrowParameters();
design.SetData(collection, returnType, chain, node, false);
string[] names = chain.Select(x => x.MethodName).ToArray();
var(simplePreCheck, simpleResult) = TryRewriteSimple(design, names);
if (simplePreCheck && simpleResult != null)
{
return(simpleResult);
}
if (simplePreCheck)
{
design.SetData(collection, returnType, chain, node, true);
}
design.HasResultMethod = MethodsWithResult.Contains(names.Last());
RewriteComposite(design, names);
var body = design.Error ? new [] { design.InitialStatements[0] } : GetMethodBody(design);
if (design.NotRewrite)
{
throw new NotSupportedException("Not good for rewrite");
}
if (design.Data.CurrentMethodIsConditional && design.ReturnType.Type.ToString() != "void")
{
return(ConditionalExpression(design.CurrentCollection.IsEqual(null),
Default(design.ReturnType), design.Rewrite.GetMethodInvocationExpression(design, body)));
}
return(design.Rewrite.GetMethodInvocationExpression(design, body));
}
private static (bool preCheck, ExpressionSyntax result) TryRewriteSimple(RewriteDesign design, string[] names)
{
if (design.CurrentCollection?.CollectionType == CollectionType.IEnumerable)
{
return(false, null);
}
if (names.Any(x => MethodsModifyingEnumeration.Contains(x)))
{
return(false, null);
}
if (design.Data.CurrentMethodParams.Any(x => x.Modifiers.Any()))
{
return(false, null);
}
if (!MethodsCreateArray.Contains(names.First()))
{
RewriteCollectionEnumeration.Rewrite(design, Array.Empty <RewrittenValueBridge>(), false);
}
for (var i = 0; i < names.Length; i++)
{
ExpressionSyntax rewrittenPart = RewriteSimplePart(names[i], design, i);
if (design.Error)
{
return(true, null);
}
if (!design.SimpleEnumeration)
{
return(true, null);
}
if (rewrittenPart != null)
{
return(true, rewrittenPart);
}
}
if (!MethodsWithResult.Contains(names.Last()))
{
ExpressionSyntax rewrittenPart = RewriteToArray.SimpleRewrite(design, Array.Empty <RewrittenValueBridge>());
if (!design.SimpleEnumeration)
{
return(true, null);
}
if (rewrittenPart != null)
{
return(true, rewrittenPart);
}
}
return(true, null);
}
