Kotlin Groovy Style Builder

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fun main(args:Array<String>):Unit{       val x = a{         aa{             +"01.01"             +"01.02"         }         aa{             +"02.01"             +"02.02"         }     }     print(x) }   fun a(p:A.()->Unit):A {       val a = A()     a.p()     return a; }   class A {       val children=arrayListOf<AA>()       fun aa(p:AA.()->Unit){           val aa = AA();         aa.p();         children.add(aa);     }       override fun toString(): String {         val builder = StringBuilder("<a>")         children.forEach { builder.append(it.toString()) }         builder.append("\r\n</a>")         return builder.toString();     }   }   class AA {     val children=arrayListOf<String>()       operator fun String.unaryPlus() {         children.add("\r\n\t\t<text>${this}</text>")     }       override fun toString(): String {         val builder = StringBuilder("\r\n\t<aa>")         children.forEach { builder.append(it.toString()) }         builder.append("\r\n\t</aa>")         return builder.toString();     } }

 执行结果

<a>
    <aa>
        <text>01.01</text>
        <text>01.02</text>
    </aa>
    <aa>
        <text>02.01</text>
        <text>02.02</text>
    </aa>
</a>

 

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import java.util.*   import List.Companion.list import Map.Companion.map     fun main(args: Array<String>): Unit {       val x = list {         values("a", "b", "c")         list {             values("a", "b", "c")             map {                 values("name" to "Fred")             }         }         map {             values(                     "name" to "Fred",                     "age" to "28",                     "fav" to list {                         values("java", "c++", "kotlin")                     }             )         }     }       val y = map {         values("languages" to list {             values("java", "c++", "perl")             values("scala","kotlin","ruby")         })     }       println(x)     println(y) }     class List : ArrayList<Any>() {       companion object {           fun list(p: List.() -> Unit): List {             val l = List()             l.p()             return l         }     }       fun values(vararg x: Any) {         this.addAll(x)     }       fun list(p: List.() -> Unit) {         val l = List()         l.p()         this.add(l as Any)     }       fun map(p: Map.() -> Unit) {         val m = Map()         m.p()         this.add(m as Any)     }   }   class Map : HashMap<String, Any>() {       companion object {           fun map(p: Map.() -> Unit): Map {             val m = Map()             m.p()             return m         }     }       fun values(vararg x: Pair<String, Any>) {         this.putAll(x)     }       fun list(p: List.() -> Unit): List {         val l = List()         l.p()         return l;     }       fun map(p: Map.() -> Unit): Map {         val m = Map()         m.p()         return m       }   }

执行结果

[a, b, c, [a, b, c, {name=Fred}], {name=Fred, fav=[java, c++, kotlin], age=28}]
{languages=[java, c++, perl, scala, kotlin, ruby]}