A simple beautifier for bracket expressions, implemented for, but not limited to, Scala ASTs.
scala> import com.github.mlangc.brackets.api._
scala> beautify("(2 * (3 + f(a, g(h(k(l(x) + 1) + 1) + 1) + 1)*5))")
res0: String =
(
2 * (
3 + f(
a, g(
h(k(l(x) + 1) + 1) + 1
) + 1
)*5
)
)
scala> import scala.reflect.runtime.universe._
scala> beautify(showRaw(reify { 3 + Seq(Seq(1, 2), Seq()).flatten.sum }))
res4: String =
Expr(
Apply(
Select(Literal(Constant(3)), TermName("$plus")), List(
Apply(
Select(
Apply(
Select(
Apply(
Select(Ident(scala.collection.Seq), TermName("apply")), List(
Apply(
Select(Ident(scala.collection.Seq), TermName("apply")), List(Literal(Constant(1)), Literal(Constant(2)))
), Apply(Select(Ident(scala.collection.Seq), TermName("apply")), List())
)
), TermName("flatten")
), List(Select(Ident(scala.Predef), TermName("$conforms")))
), TermName("sum")
), List(Select(Ident(scala.math.Numeric), TermName("IntIsIntegral")))
)
)
)
)
If you want to add the beautifier as a dependency to your project, you can do so by add the following line to your build.sbt:
libraryDependencies += "com.github.mlangc" %% "bracket-expression-beautifier" % "2.0.0"
The library is available for Scala-2.11 and Scala-2.12.
Clone the repo, cd into it and run
$ sbt test:console
This starts an Ammonite-REPL with a few predefined imports.
Use MetaAsts.format to print scala.meta ASTs and NscAsts.format to print ASTs from the
Scala Compiler.
A sample session could look like
Welcome to the Ammonite Repl 0.8.2
@ MetaAsts.format(q"for(i <- 1.to(42)) yield i*i")
res0: String = """
Term.ForYield(
Seq(
Enumerator.Generator(
Pat.Var.Term(Term.Name("i")), Term.Apply(Term.Select(Lit(1), Term.Name("to")), Seq(Lit(42)))
)
), Term.ApplyInfix(Term.Name("i"), Term.Name("*"), Nil, Seq(Term.Name("i")))
)
"""
@ NscAsts.format("for(i <- 1.to(42)) yield i*i")
res1: String = """
Apply(
Apply(
TypeApply(
Select(
Apply(
Select(
Apply(
Select(
Select(This(TypeName("scala")), scala.Predef), TermName("intWrapper")
), List(Literal(Constant(1)))
), TermName("to")
), List(Literal(Constant(42)))
), TermName("map")
), List(TypeTree(), TypeTree())
), List(
Function(
List(ValDef(Modifiers(PARAM), TermName("i"), TypeTree(), EmptyTree)), Apply(
Select(Ident(TermName("i")), TermName("$times")), List(Ident(TermName("i")))
)
)
)
), List(
TypeApply(
...