internal static InstanceProvider?ForMethod(
Compilation compilation,
AttributedMembers attrMembers,
DeserializerTypes types,
Location?loc,
INamedTypeSymbol rowType,
INamedTypeSymbol hostType,
string mtdName,
ref ImmutableArray <Diagnostic> diags
)
{
var instanceProviderMtd = Utils.GetMethod(hostType, mtdName, loc, ref diags);
if (instanceProviderMtd == null)
{
return(null);
}
var instanceProviderLoc = instanceProviderMtd.Locations.FirstOrDefault();
var methodReturnType = instanceProviderMtd.ReturnType;
if (methodReturnType.SpecialType != SpecialType.System_Boolean)
{
var diag = Diagnostics.MethodMustReturnBool(instanceProviderLoc, instanceProviderMtd);
diags = diags.Add(diag);
return(null);
}
if (!instanceProviderMtd.IsStatic)
{
var diag = Diagnostics.MethodNotStatic(instanceProviderLoc, instanceProviderMtd);
diags = diags.Add(diag);
return(null);
}
var accessible = instanceProviderMtd.IsAccessible(attrMembers);
if (!accessible)
{
var diag = Diagnostics.MethodNotPublicOrInternal(instanceProviderLoc, instanceProviderMtd);
diags = diags.Add(diag);
return(null);
}
var ps = instanceProviderMtd.Parameters;
if (ps.Length != 2)
{
var diag = Diagnostics.BadInstanceProviderParameters(instanceProviderLoc, instanceProviderMtd);
diags = diags.Add(diag);
return(null);
}
var p0 = ps[0];
if (!p0.IsInReadContext(types.OurTypes))
{
var diag = Diagnostics.BadInstanceProviderParameters(instanceProviderLoc, instanceProviderMtd);
diags = diags.Add(diag);
return(null);
}
var p1 = ps[1];
if (p1.RefKind != RefKind.Out)
{
var diag = Diagnostics.BadInstanceProviderParameters(instanceProviderLoc, instanceProviderMtd);
diags = diags.Add(diag);
return(null);
}
var conversion = compilation.ClassifyConversion(p1.Type, rowType);
var canConvert = conversion.IsImplicit || conversion.IsIdentity;
if (!canConvert)
{
var diag = Diagnostics.BadInstanceProviderParameters(instanceProviderLoc, instanceProviderMtd);
diags = diags.Add(diag);
return(null);
}
return(new InstanceProvider(false, instanceProviderMtd, p1.Type));
}
