ScalaMeta："统计数据"和"孩子"有什么区别

Question

stats是语句的缩写，而children就是它的缩写。我运行了两种方法，结果似乎是一样的。有人能给我指出两者之间更详细的区别吗。

附上一个示例代码，可以在Scastie上运行(https://scastie.scala-lang.org/A6huYabOTGmpZu9HRa6UZw)

val program = """
object Main {
def main(args: Array[String]): Unit = {
println("Hello Scalameta!")
}
def cats(args: Array[String]): Unit = {
println("Ancient cat here!")
}
def bats(args: Array[String]): Unit = {
println("Ancient bat here!")
}

def dragons = {
bats(List())
cats(List())
}
val ancient = dragons()
}
"""
import scala.meta._
val tree = program.parse[Source].get
println(tree.stats.head.children)
println("-----------------------n")
tree.children.head.children.tail.head.children.foreach(child => {
println(s"${child.productPrefix} From: ${child.pos.startLine} and End: ${child.pos.endLine}")
println(child)
println("-----------------------n")
})

Answer 1

每个Tree都有children: List[Tree]，但只有Source(及其继承者(有stats: List[Stat]。

https://www.javadoc.io/doc/org.scalameta/trees_2.13/latest/scala/meta/Tree.html

https://www.javadoc.io/doc/org.scalameta/trees_2.13/latest/scala/meta/Source.html