Lukas Wegmann Luegg

Print Raw ASTs in the REPL

Sometimes it is just useful to see the typechecked AST of a scala expression.

Macros to the rescue:

import scala.reflect.macros.Context
import scala.language.experimental.macros

Desugar Scala Expressions

Use the compiler

scala -Xprint:typer -e "class A(val i: Int)" prints the desugarred expression after the typer phase. Use scala -Xshow-phases to get a list of all phases.

Or use a macro in the REPL

Paste this into a REPL session or in a file loaded with the :load command:

	{
	"cmd": ["tsc", "$file"],
	"file_regex": "(.\\.ts?)\\s\\(([0-9]+)\\,([0-9]+)\\)\\:\\s(...?)$",
	"selector": "source.ts",
	"osx": {
	"path": "/usr/local/bin:/opt/local/bin"
	},
	"windows": {
	"cmd": ["tsc.cmd", "$file"],
	"path": "C:\\Program Files\\nodejs\\;C:\\Users\\Lukas\\AppData\\Roaming\\npm\\"

	<!DOCTYPE html>
	<meta charset=utf-8>
	<title>Minimal Plunk</title>