func getManualConversionFunctions()

in cmd/conversion-gen/generators/conversion.go [134:199]
57 lines of code
18 McCabe index (conditional complexity)

func getManualConversionFunctions(context *generator.Context, pkg *types.Package, manualMap conversionFuncMap) {
	if pkg == nil {
		klog.Warning("Skipping nil package passed to getManualConversionFunctions")
		return
	}
	klog.V(5).Infof("Scanning for conversion functions in %v", pkg.Name)

	scopeName := types.Ref(conversionPackagePath, "Scope").Name
	errorName := types.Ref("", "error").Name
	buffer := &bytes.Buffer{}
	sw := generator.NewSnippetWriter(buffer, context, "$", "$")

	for _, f := range pkg.Functions {
		if f.Underlying == nil || f.Underlying.Kind != types.Func {
			klog.Errorf("Malformed function: %#v", f)
			continue
		}
		if f.Underlying.Signature == nil {
			klog.Errorf("Function without signature: %#v", f)
			continue
		}
		klog.V(8).Infof("Considering function %s", f.Name)
		signature := f.Underlying.Signature
		// Check whether the function is conversion function.
		// Note that all of them have signature:
		// func Convert_inType_To_outType(inType, outType, conversion.Scope) error
		if signature.Receiver != nil {
			klog.V(8).Infof("%s has a receiver", f.Name)
			continue
		}
		if len(signature.Parameters) != 3 || signature.Parameters[2].Name != scopeName {
			klog.V(8).Infof("%s has wrong parameters", f.Name)
			continue
		}
		if len(signature.Results) != 1 || signature.Results[0].Name != errorName {
			klog.V(8).Infof("%s has wrong results", f.Name)
			continue
		}
		inType := signature.Parameters[0]
		outType := signature.Parameters[1]
		if inType.Kind != types.Pointer || outType.Kind != types.Pointer {
			klog.V(8).Infof("%s has wrong parameter types", f.Name)
			continue
		}
		// Now check if the name satisfies the convention.
		// TODO: This should call the Namer directly.
		args := argsFromType(inType.Elem, outType.Elem)
		sw.Do("Convert_$.inType|public$_To_$.outType|public$", args)
		if f.Name.Name == buffer.String() {
			klog.V(4).Infof("Found conversion function %s", f.Name)
			key := conversionPair{inType.Elem, outType.Elem}
			// We might scan the same package twice, and that's OK.
			if v, ok := manualMap[key]; ok && v != nil && v.Name.Package != pkg.Path {
				panic(fmt.Sprintf("duplicate static conversion defined: %s -> %s from:\n%s.%s\n%s.%s", key.inType, key.outType, v.Name.Package, v.Name.Name, f.Name.Package, f.Name.Name))
			}
			manualMap[key] = f
		} else {
			// prevent user error when they don't get the correct conversion signature
			if strings.HasPrefix(f.Name.Name, "Convert_") {
				klog.Errorf("Rename function %s %s -> %s to match expected conversion signature", f.Name.Package, f.Name.Name, buffer.String())
			}
			klog.V(8).Infof("%s has wrong name", f.Name)
		}
		buffer.Reset()
	}
}