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 main
import "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 main
import "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
})
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
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