public static string GetAssemblyMetadata(this GeneratorExecutionContext context, string key)
{
foreach (var a in context.FindAttributes("AssemblyMetadataAttribute"))
{
if (a.ConstructorArguments.Length == 2 && a.ConstructorArguments[0].Value?.ToString() == key)
{
return(a.ConstructorArguments[1].Value?.ToString());
}
}
return(null);
}
public void Execute(GeneratorExecutionContext context)
{
var isIos = context.IsiOS();
var isAndroid = context.IsAndroid();
if (!isIos && !isAndroid)
{
return;
}
var syntaxReceiver = (AppStartupSyntaxReceiver)context.SyntaxReceiver;
var namespaceName = context.Compilation.GlobalNamespace.Name;
if (string.IsNullOrEmpty(namespaceName))
{
namespaceName = context.Compilation.AssemblyName ?? "GeneratedMauiApp";
}
if (context.IsAppHead())
{
// Look for a `[assembly: MauiStartup(typeof(StartupClass))]` attribute
var startupAttributes = context.FindAttributes("MauiStartupAttribute")?.ToList();
// If we have multiple, throw an error
if ((startupAttributes?.Count ?? 0) > 1)
{
context.ReportDiagnostic(Diagnostic.Create("MAUI1010", "Compiler", "More than one MauiStartupAttribute found.", DiagnosticSeverity.Error, DiagnosticSeverity.Error, true, 0));
return;
}
var startupAttribute = startupAttributes.FirstOrDefault();
// If we don't have any,
if (startupAttribute != null)
{
// Get the constructor arg which we expect to be the startup class type name
var ctorTypeArg = startupAttribute.ConstructorArguments.FirstOrDefault();
var startupClassName = ctorTypeArg.Value?.ToString();
if (!string.IsNullOrEmpty(startupClassName))
{
// Prefix with global:: when we generate code to be safe
if (!startupClassName.StartsWith("global::"))
{
startupClassName = $"global::{startupClassName}";
}
if (isIos)
{
// Prefix with global:: when we generate code to be safe
var appDelegateClassName = $"{namespaceName}.AppDelegate";
if (!appDelegateClassName.StartsWith("global::"))
{
appDelegateClassName = $"global::{appDelegateClassName}";
}
// Create an app delegate
// We check to see if there's already an app delegate
// If there is, if it's partial and the same name as the one we generate, that's fine too
if (!syntaxReceiver.HasiOSAppDelegateSubclass || syntaxReceiver.iOSPartialAppDelegateSubclassType.Equals(appDelegateClassName))
{
context.AddSource("Maui_Generated_MauiGeneratedAppDelegate.cs",
GenerateiOSAppDelegate(namespaceName, startupClassName));
}
else
{
context.ReportDiagnostic(Diagnostic.Create("MAUI1020", "Compiler", "UIApplicationDelegate implementation already exists, not generating one.", DiagnosticSeverity.Warning, DiagnosticSeverity.Warning, true, 3));
}
// Create a main method
if (!syntaxReceiver.HasiOSMainMethod)
{
context.AddSource("Maui_Generated_MauiGeneratedMain.cs",
GenerateiOSMain(namespaceName, appDelegateClassName));
}
else
{
context.ReportDiagnostic(Diagnostic.Create("MAUI1021", "Compiler", "Main method implementation already exists, not generating one.", DiagnosticSeverity.Warning, DiagnosticSeverity.Warning, true, 3));
}
}
else if (isAndroid)
{
var appName = context.GetMSBuildProperty("ApplicationTitle") ?? "App1";
context.AddSource("Maui_Generated_MauiGeneratedAndroidActivity.cs",
GenerateAndroidMainActivity(appName, namespaceName, startupClassName));
if (!syntaxReceiver.HasAndroidMainLauncher)
{
context.AddSource("Maui_Generated_MauiGeneratedAndroidApplication.cs",
GenerateAndroidApplication(namespaceName, startupClassName));
}
else
{
context.ReportDiagnostic(Diagnostic.Create("MAUI1021", "Compiler", "Activity with MainLauncher=true already exists, not generating one.", DiagnosticSeverity.Warning, DiagnosticSeverity.Warning, true, 3));
}
}
}
}
}
}