粘贴模式/ kotlin REPL中的多行段？

Question

给定一个函数的骨架：

fun reformat(
    str: String,
    normalizeCase: Boolean = true,
    upperCaseFirstLetter: Boolean = true,
    divideByCamelHumps: Boolean = false,
    wordSeparator: Char = ' ',
) {
  println("In reformat")
}

我把它粘贴到kotlin REPL中，它抱怨了--显然是因为没有意识到它被发送了一个多行代码段：

>>> fun reformat(
error: parameter name expected
fun reformat(
             ^
error: expecting comma or ')'
fun reformat(
             ^
error: expecting ')'
fun reformat(
             ^

>>>     str: String,
error: expecting an element
    str: String,
       ^
error: expecting an element
    str: String,
               ^

etc ..

什么是scala中的:paste？

Answer 1

我发现了一个项目--显然是由JetBrains kotlin开发人员自己积极改进的，它解决了这个问题和其他问题：https://github.com/Kotlin/kotlin-interactive-shell。这是他们的帮助

[0] :h
:quit or q                           quit the shell
:load or l <path>                    load file and evaluate
:type or t <expr>                    display the type of an expression without evaluating it
:list or ls                          list defined symbols
:help or h [command]                 print this summary or command-specific help
:paste or p                          enter paste mode
:syntax {on | off}                   syntax highlighting
:prompt [pattern]                    customize prompt
:set                                 set configuration parameter
:conf                                list configuration parameters
:dependsOn <artifact coordinates>    Load dependency from the current set of repositories
:repository <repository coordinates> Add repository for the artifacts lookup
:classpath or cp                     Show current script compilation classpath

特别是通知：

[1] :p
// Entering paste mode (ctrl-D to finish)

这正是我要找的。它确实有效(尽管它使用了丑陋的JDK9警告)：

[1] :p
// Entering paste mode (ctrl-D to finish)
fun reformat(
    str: String,
    normalizeCase: Boolean = true,
    upperCaseFirstLetter: Boolean = true,
    divideByCamelHumps: Boolean = false,
    wordSeparator: Char = ' ',
) {
  println("In reformat")
}

// Exiting paste mode, now interpreting.
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.jetbrains.kotlin.com.intellij.util.ReflectionUtil (file:/Users/steve/git/kotlin-interactive-shell/ki-shell/target/ki-shell-0.4-SNAPSHOT-shaded.jar) to method java.util.ResourceBundle.setParent(java.util.ResourceBundle)
WARNING: Please consider reporting this to the maintainers of org.jetbrains.kotlin.com.intellij.util.ReflectionUtil
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
[2] reformat()
ERROR No value passed for parameter 'str' (Line_3.kts:1:10)
[3] reformat("abc")
In reformat

Answer 2

它看起来像Kotlin REPL打算从IDE中使用。如果您从Intellij IDEA内部打开它，它就像一种魅力，允许您进行多行输入。我看不出有什么选项可以让你在普通的shell中做同样的事情。因此，在您的示例中，您可以在一行中声明函数，也可以从文件中加载脚本。