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REPL - invoke pprint reflectively #24119

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REPL - invoke pprint reflectively #24119

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31 changes: 30 additions & 1 deletion compiler/src/dotty/tools/repl/Rendering.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,35 @@ private[repl] class Rendering(parentClassLoader: Option[ClassLoader] = None):

var myClassLoader: AbstractFileClassLoader = uninitialized

private def pprintRender(value: Any, width: Int, height: Int, initialOffset: Int)(using Context): String = {
def fallback() =
dotty.shaded.pprint.PPrinter.BlackWhite.apply(
value, width = width, height = height, initialOffset = initialOffset
).plainText
try
val cl = classLoader()
val pprintCls = Class.forName("dotty.shaded.pprint.PPrinter$BlackWhite$", false, cl)
val fansiStrCls = Class.forName("dotty.shaded.fansi.Str", false, cl)
val BlackWhite = pprintCls.getField("MODULE$").get(null)
val BlackWhite_apply = pprintCls.getMethod("apply",
classOf[Any], // value
classOf[Int], // width
classOf[Int], // height
classOf[Int], // indentation
classOf[Int], // initialOffset
classOf[Boolean], // escape Unicode
classOf[Boolean], // show field names
)
val FansiStr_plainText = fansiStrCls.getMethod("plainText")
val fansiStr = BlackWhite_apply.invoke(
BlackWhite, value, width, height, 2, initialOffset, false, true
)
FansiStr_plainText.invoke(fansiStr).asInstanceOf[String]
catch
case _: ClassNotFoundException => fallback()
case _: NoSuchMethodException => fallback()
}


/** Class loader used to load compiled code */
private[repl] def classLoader()(using Context) =
Expand Down Expand Up @@ -55,7 +84,7 @@ private[repl] class Rendering(parentClassLoader: Option[ClassLoader] = None):
/** Return a String representation of a value we got from `classLoader()`. */
private[repl] def replStringOf(sym: Symbol, value: Object)(using Context): String = {
// pretty-print things with 100 cols 50 rows by default,
dotty.shaded.pprint.PPrinter.BlackWhite.apply(value, width = 100, height = 50).plainText
pprintRender(value, width = 100, height = 50, initialOffset = 0 /* TODO: include offset */)
}

/** Load the value of the symbol using reflection.
Expand Down
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