英文:
Is it possible to write a 'fluent' style api in go?
问题
几种其他语言具有“流畅”或链式调用风格的API，允许您进行如下调用：
public class CatMap : ClassMap<Cat>{public CatMap(){Id(x => x.Id);Map(x => x.Name).Length(16).Not.Nullable();Map(x => x.Sex);References(x => x.Mate);HasMany(x => x.Kittens);}}
值得注意的例子包括流畅的nhibernate，jquery方法链接等。这是一种常见（我会说非常受欢迎）的API设计模式。
问题：Go语法似乎不支持这种方式。
在Go中，您可以这样做：
var blah = X().Y().Thing().OtherThing()
...但是这样：
package mainimport "n"func main() {n.Log(":D").Example().Example}
会导致：
> command-line-arguments> ./app.go:7: syntax error: unexpected .
...基本上是因为Go会自动在行末插入分号。
有人知道是否有办法解决这个问题吗？
您是否可以在某种程度上禁用自动插入分号？
或者说在Go中这种类型的API是否不可能实现？
英文:
Several other languages have a 'fluent' or chained-invokation style of api, which allows you to do calls like this:
public class CatMap : ClassMap<Cat>{public CatMap(){Id(x => x.Id);Map(x => x.Name).Length(16).Not.Nullable();Map(x => x.Sex);References(x => x.Mate);HasMany(x => x.Kittens);}}
Notable examples include fluent nhibernate, jquery method chaining, etc. It's a common (and I'd say quite well loved) api design pattern.
Problem: The go syntax doesn't seem to support this.
You can do this in go:
var blah = X().Y().Thing().OtherThing()
...but this:
package mainimport "n"func main() {n.Log(":D").Example().Example}
Results in:
> command-line-arguments> ./app.go:7: syntax error: unexpected .
...basically, because go automatically inserts ;'s at the end of a line.
Anyone know if there's a way around this?
Can you disable the auto-; in a block somehow?
Or is this sort of api just not possible in go?
答案1
得分: 15
你可以重新格式化你的代码为
func main() {n.Log("：D").Example().Example}
将句号放在行尾可以避免自动分号插入 - 它只会在标识符、字面量或闭合的括号/大括号之后发生。
英文:
You can reformat your code to
func main() {n.Log(":D").Example().Example}
Putting the period at the end of the line avoids automatic semicolon insertion—it only happens after identifiers, literals or closing parens/braces.
答案2
得分: -3
请查看goproxy。我认为其中的一部分是流畅的。
proxy.OnRequest(goproxy.DstHostIs("www.reddit.com")).DoFunc(func(r *http.Request,ctx *goproxy.ProxyCtx)(*http.Request,*http.Response) {if h,_,_ := time.Now().Clock(); h >= 8 && h <= 17 {return r,goproxy.NewResponse(r,goproxy.ContentTypeText,http.StatusForbidden,"别浪费时间！")}return r,nil})
英文:
Have a look at goproxy. I think some part of it are fluent.
proxy.OnRequest(goproxy.DstHostIs("www.reddit.com")).DoFunc(func(r *http.Request,ctx *goproxy.ProxyCtx)(*http.Request,*http.Response) {if h,_,_ := time.Now().Clock(); h >= 8 && h <= 17 {return r,goproxy.NewResponse(r,goproxy.ContentTypeText,http.StatusForbidden,"Don't waste your time!")}return r,nil})
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