func()

in bind/genobjc.go [1304:1386]

• 77 lines of code
• 27 McCabe index (conditional complexity)

func (g *ObjcGen) objcType(typ types.Type) string {

	if isErrorType(typ) {
		return "NSError* _Nullable"
	}

	switch typ := typ.(type) {
	case *types.Basic:
		switch typ.Kind() {
		case types.Bool, types.UntypedBool:
			return "BOOL"
		case types.Int:
			return "long"
		case types.Int8:
			return "int8_t"
		case types.Int16:
			return "int16_t"
		case types.Int32, types.UntypedRune: // types.Rune
			return "int32_t"
		case types.Int64, types.UntypedInt:
			return "int64_t"
		case types.Uint8:
			// byte is an alias of uint8, and the alias is lost.
			return "byte"
		case types.Uint16:
			return "uint16_t"
		case types.Uint32:
			return "uint32_t"
		case types.Uint64:
			return "uint64_t"
		case types.Float32:
			return "float"
		case types.Float64, types.UntypedFloat:
			return "double"
		case types.String, types.UntypedString:
			return "NSString* _Nonnull"
		default:
			g.errorf("unsupported type: %s", typ)
			return "TODO"
		}
	case *types.Slice:
		elem := g.objcType(typ.Elem())
		// Special case: NSData seems to be a better option for byte slice.
		if elem == "byte" {
			return "NSData* _Nullable"
		}
		// TODO(hyangah): support other slice types: NSArray or CFArrayRef.
		// Investigate the performance implication.
		g.errorf("unsupported type: %s", typ)
		return "TODO"
	case *types.Pointer:
		if _, ok := typ.Elem().(*types.Named); ok {
			return g.objcType(typ.Elem()) + "* _Nullable"
		}
		g.errorf("unsupported pointer to type: %s", typ)
		return "TODO"
	case *types.Named:
		n := typ.Obj()
		if isObjcType(typ) {
			w := g.wrapMap[n.Name()]
			return w.ObjcType()
		}
		if !isErrorType(typ) && !g.validPkg(n.Pkg()) {
			g.errorf("type %s is in package %s, which is not bound", n.Name(), n.Pkg().Name())
			return "TODO"
		}
		switch t := typ.Underlying().(type) {
		case *types.Interface:
			if makeIfaceSummary(t).implementable {
				return "id<" + g.namePrefixOf(n.Pkg()) + n.Name() + "> _Nullable"
			} else {
				return g.namePrefixOf(n.Pkg()) + n.Name() + "* _Nullable"
			}
		case *types.Struct:
			return g.namePrefixOf(n.Pkg()) + n.Name()
		}
		g.errorf("unsupported, named type %s", typ)
		return "TODO"
	default:
		g.errorf("unsupported type: %#+v, %s", typ, typ)
		return "TODO"
	}
}