在 golang HTML 模板中切换或 if/elseif/else

我有这个结构：

const (
    paragraph_hypothesis = 1<<iota
    paragraph_attachment = 1<<iota
    paragraph_menu       = 1<<iota
)

type Paragraph struct {
    Type int // paragraph_hypothesis or paragraph_attachment or paragraph_menu
}

Type

isAttachmentType{{if}}

{{range .Paragraphs}}
    {{if .IsAttachment}}
        -- attachement presentation code  --
    {{else}}{{if .IsMenu}}
        -- menu --
    {{else}}
        -- default code --
    {{end}}{{end}}
{{end}}

IsSomething{{end}}

switchif/elseif/else