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Remove hand-written ScalaSodium boilerplate!
Replace with a combo sun.tools + scalameta + scalafmt Frankenstein
monster of a scala script ran from within SBT.
Simply type
> gensodium
whenever the `sodium.i` file is changed, and `ScalaSodium0.scala`
will be updated as necessary.
Also tweak the setup scripts to work mo' bettah on OS X, for
brainwashed mac users like myself.- Loading branch information
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,24 @@ | ||
| package tsec.build | ||
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| object GenSodiumPlugin extends sbt.AutoPlugin { | ||
| import sbt._ | ||
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| override def requires = empty | ||
| override def trigger = allRequirements | ||
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| object autoImport { | ||
| lazy val gensodium = taskKey[Unit]("Generate ScalaSodium0.scala") | ||
| } | ||
| import autoImport._ | ||
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| override def buildSettings = Seq( | ||
| /* See plugins.sbt for why this is dynamically loaded */ | ||
| gensodium := { | ||
| getClass.getClassLoader | ||
| .loadClass("tsec.build.GenSodium") | ||
| .getMethod("main", classOf[Array[String]]) | ||
| .invoke(null, Array.empty[String]) | ||
| } | ||
| ) | ||
|
|
||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| package tsec.build | ||
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| import scala.collection.JavaConverters._ | ||
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| object GenSodium extends App { | ||
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| val FormatConfig = { | ||
| import org.scalafmt.config._ | ||
| ScalafmtConfig.intellij.copy( | ||
| align = Align.none, | ||
| newlines = ScalafmtConfig.intellij.newlines.copy( | ||
| alwaysBeforeTopLevelStatements = true, | ||
| ) | ||
| ) | ||
| } | ||
|
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| import com.sun.source.{tree => jtree} | ||
| import javax.lang.model.`type`.TypeKind | ||
| import java.nio.charset._ | ||
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| val jMethods: Seq[jtree.MethodTree] = { | ||
| import com.sun.tools.javac._ | ||
| import tree.{JCTree => tree} | ||
| import scala.io._ | ||
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| val source = Source | ||
| .fromFile("tsec-libsodium/jni/Sodium.java") // looking here b/c param names not in SodiumJNI | ||
| .mkString | ||
| val ctx = new util.Context() | ||
| new file.JavacFileManager(ctx, true, StandardCharsets.UTF_8) | ||
| util.Options.instance(ctx).put(com.sun.tools.javac.main.Option.PARAMETERS, "true") | ||
| val parse = parser.ParserFactory | ||
| .instance(ctx) | ||
| .newParser(source, false, false, false) | ||
| val unit = parse.parseCompilationUnit() | ||
| val clasz = unit.getTypeDecls.asScala.collectFirst { | ||
| case decl: tree.JCClassDecl if decl.name.toString == "Sodium" => decl | ||
| }.getOrElse(sys.error("could not find Sodium class")) | ||
|
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| clasz.defs.asScala.collect { | ||
| case decl: tree.JCMethodDecl => decl | ||
| } | ||
| } | ||
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| import scala.meta._ | ||
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| def transType(jt: jtree.Tree): Type = jt match { | ||
| case prim: jtree.PrimitiveTypeTree => prim.getPrimitiveTypeKind match { | ||
| case TypeKind.BOOLEAN => t"Boolean" | ||
| case TypeKind.BYTE => t"Byte" | ||
| case TypeKind.SHORT => t"Short" | ||
| case TypeKind.INT => t"Int" | ||
| case TypeKind.LONG => t"Long" | ||
| case TypeKind.CHAR => t"Char" | ||
| case TypeKind.FLOAT => t"Float" | ||
| case TypeKind.DOUBLE => t"Double" | ||
| case TypeKind.VOID => t"Unit" | ||
| case other => sys.error(s"Unsupported primitive type kind $other") | ||
| } | ||
| case arr: jtree.ArrayTypeTree => t"Array[${transType(arr.getType)}]" | ||
| } | ||
|
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| val sMethods = jMethods.map { jm => | ||
| val params: List[Term.Param] = jm.getParameters.asScala.map { jp => | ||
| val name = Term.Name(jp.getName.toString) | ||
| val tpe = transType(jp.getType) | ||
| Term.Param(mods = Nil, name = name, decltpe = Some(tpe), default = None) | ||
| }.toList | ||
| val name = Term.Name(jm.getName.toString) | ||
| val tpe = transType(jm.getReturnType) | ||
| val args = params.map { p => Term.Name(p.name.value) } | ||
| val rhs = q"SodiumJNI.$name(..$args)" | ||
| Defn.Def( | ||
| mods = Mod.Final() :: Nil, | ||
| name = name, | ||
| tparams = Nil, | ||
| paramss = List(params), | ||
| decltpe = Some(tpe), | ||
| body = rhs | ||
| ) | ||
| }.sortBy(_.name.value).toList | ||
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| val noSelfType = Term.Param(Nil, Name.Anonymous(), None, None) | ||
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| val clsDef = Defn.Class( | ||
| mods = Mod.Abstract() :: Mod.Protected(within = Term.Name("tsec")):: Nil, | ||
| name = Type.Name("ScalaSodium0"), | ||
| tparams = Nil, | ||
| ctor = Ctor.Primary(Mod.Private(within = Term.Name("tsec")) :: Nil, name = Ctor.Name("ScalaSodium0"), paramss = Nil), | ||
| templ = Template(early = Nil, parents = Nil, self = noSelfType, Some(sMethods)) | ||
| ) | ||
|
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| val warning = | ||
| s"""/* !!! GENERATED CODE: DO NOT EDIT !!! */ | ||
| |/* This file is generated by project/boiler/gensodium.scala from tsec-libsodium/jni/sodium.i */ | ||
| |/* Timestamp: ${java.time.Instant.now.toString} */ | ||
| | | ||
| """.stripMargin | ||
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| val pkg = Pkg(q"tsec.jni", clsDef :: Nil) | ||
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| val src = org.scalafmt.Scalafmt.format(warning + pkg.toString, style = FormatConfig).get | ||
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| import java.io._ | ||
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| new FileOutputStream(new File("tsec-libsodium/src/main/scala/tsec/jni/ScalaSodium0.scala")) | ||
| .write(src.getBytes(StandardCharsets.UTF_8)) | ||
| } |
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