func()

in mockgen/parse.go [416:509]

• 87 lines of code
• 30 McCabe index (conditional complexity)

func (p *fileParser) parseType(pkg string, typ ast.Expr) (model.Type, error) {
	switch v := typ.(type) {
	case *ast.ArrayType:
		ln := -1
		if v.Len != nil {
			value, err := p.parseArrayLength(v.Len)
			if err != nil {
				return nil, err
			}
			ln, err = strconv.Atoi(value)
			if err != nil {
				return nil, p.errorf(v.Len.Pos(), "bad array size: %v", err)
			}
		}
		t, err := p.parseType(pkg, v.Elt)
		if err != nil {
			return nil, err
		}
		return &model.ArrayType{Len: ln, Type: t}, nil
	case *ast.ChanType:
		t, err := p.parseType(pkg, v.Value)
		if err != nil {
			return nil, err
		}
		var dir model.ChanDir
		if v.Dir == ast.SEND {
			dir = model.SendDir
		}
		if v.Dir == ast.RECV {
			dir = model.RecvDir
		}
		return &model.ChanType{Dir: dir, Type: t}, nil
	case *ast.Ellipsis:
		// assume we're parsing a variadic argument
		return p.parseType(pkg, v.Elt)
	case *ast.FuncType:
		in, variadic, out, err := p.parseFunc(pkg, v)
		if err != nil {
			return nil, err
		}
		return &model.FuncType{In: in, Out: out, Variadic: variadic}, nil
	case *ast.Ident:
		if v.IsExported() {
			// `pkg` may be an aliased imported pkg
			// if so, patch the import w/ the fully qualified import
			maybeImportedPkg, ok := p.imports[pkg]
			if ok {
				pkg = maybeImportedPkg.Path()
			}
			// assume type in this package
			return &model.NamedType{Package: pkg, Type: v.Name}, nil
		}

		// assume predeclared type
		return model.PredeclaredType(v.Name), nil
	case *ast.InterfaceType:
		if v.Methods != nil && len(v.Methods.List) > 0 {
			return nil, p.errorf(v.Pos(), "can't handle non-empty unnamed interface types")
		}
		return model.PredeclaredType("interface{}"), nil
	case *ast.MapType:
		key, err := p.parseType(pkg, v.Key)
		if err != nil {
			return nil, err
		}
		value, err := p.parseType(pkg, v.Value)
		if err != nil {
			return nil, err
		}
		return &model.MapType{Key: key, Value: value}, nil
	case *ast.SelectorExpr:
		pkgName := v.X.(*ast.Ident).String()
		pkg, ok := p.imports[pkgName]
		if !ok {
			return nil, p.errorf(v.Pos(), "unknown package %q", pkgName)
		}
		return &model.NamedType{Package: pkg.Path(), Type: v.Sel.String()}, nil
	case *ast.StarExpr:
		t, err := p.parseType(pkg, v.X)
		if err != nil {
			return nil, err
		}
		return &model.PointerType{Type: t}, nil
	case *ast.StructType:
		if v.Fields != nil && len(v.Fields.List) > 0 {
			return nil, p.errorf(v.Pos(), "can't handle non-empty unnamed struct types")
		}
		return model.PredeclaredType("struct{}"), nil
	case *ast.ParenExpr:
		return p.parseType(pkg, v.X)
	}

	return nil, fmt.Errorf("don't know how to parse type %T", typ)
}