Created
February 21, 2014 05:41
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package scalaz.applybuilder | |
import java.io.File | |
import sbt._ | |
object Generator { | |
def main(args: Array[String]){ | |
val dir = args.headOption.flatMap(a => util.Try(new File(a)).toOption).getOrElse(sys.error("invalid argument" + args.mkString(" "))) | |
IO.delete(dir) | |
IO.write(dir / "ApplyBuilder.scala", generate(args(1).toInt)) | |
} | |
def generate(max: Int): String = { | |
val (methods, classes) = (2 to max).map{ n => | |
val % = "%" * (n - 1) | |
val F = "F" | |
val f = "f" | |
val M = "M" | |
val Fn = (1 to n).map(F + _) | |
val tparam = Fn.mkString(", ") | |
val param = (1 to n).map(i => f + i + ": => " + F + i).mkString(", ") | |
val implicits = (1 to n).map(i => F + i + ": Unapply[Apply, " + F + i + "]").mkString(", ") | |
val classTparam = (Fn.map(_ + ".M") ++ Fn.map(_ + ".A")).mkString(", ") | |
val constructorParam = (1 to n).map(i => F + i + "(" + f + i + ")").mkString(", ") | |
val evidence = (2 to n).map(i => "_" + i + ": " + F + i + "[_" + i + "] =:= F1[_" + i + "]").mkString(",\n ") | |
val m = s""" | |
def ${%}[${tparam}](${param})(implicit ${implicits}) = | |
new Apply${n}[${classTparam}](${constructorParam}, F1.TC) | |
""" | |
val applyN = { | |
if(n <= 12) | |
s"""F.apply${n}(f1, ${(2 to n).map(i => "_" + i + "(f" + i + ")").mkString(", ")})(f)""" | |
else { | |
val a = math.ceil(n / 12.0).toInt | |
val c = math.ceil(n / a.toDouble).toInt | |
val d = n - ((a - 1) * c) | |
def e(start: Int, end: Int) = s"""F.apply${c}(${(start to end).map(i => "_" + i + "(f" + i + ")").mkString(", ")})(Tuple${c}.apply)""" | |
val t = (1 to a).map("t" + _) | |
s"""F.apply${a}( | |
F.apply${d}(f1, ${(2 to d).map(i => "_" + i + "(f" + i + ")").mkString(", ")})(Tuple${d}.apply), | |
${(2 to a).map(x => e((x - 2) * c + d + 1, (x - 1) * c + d)).mkString(", ")} | |
)((${t.mkString(", ")}) => | |
${((1 to d).map("t1._" + _) ++ t.zipWithIndex.tail.flatMap{case (x, i) => (1 to c).map("t" + (i + 1) + "._" + _)}).mkString("f(",", ",")")} | |
)""" | |
} | |
} | |
val tupled = | |
if(n <= 22){ // TODO | |
s""" | |
def tupled(implicit | |
${evidence} | |
): F1[(${(1 to n).map("_" + _).mkString(", ")})] = run(Tuple${n}.apply) | |
""" | |
} else "" | |
val c = s""" | |
private[scalaz] final class Apply${n}[${Fn.map(_ + "[_]").mkString(", ")}, ${(1 to n).map("_" + _).mkString(", ")}]( | |
${(1 to n).map(i => f + i + ": => " + F + i + "[_" + i + "]").mkString(", ")}, F: Apply[F1] | |
){ | |
$tupled | |
def run[Z](f: (${(1 to n).map("_" + _).mkString(", ")}) => Z)(implicit | |
${evidence} | |
): F1[Z] = ${applyN} | |
} | |
""" | |
(m, c) | |
}.unzip | |
s""" | |
package scalaz | |
object ApplyBuilder { | |
${methods.mkString("\n")} | |
} | |
${classes.mkString("\n")} | |
""" | |
} | |
} |
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