Re-add support for scala native

It was reverted in scala#135 because of build problems, but this is very easy
to add now: we add a single 'jdk8 + scala 2.11.12' job to the build
matrix, and also restrict publishing to those versions to be sure.

Locally, the native subproject can be run with any jdk > 6 and works
normally.

fixes scala#141.

Author: gourlaysama

.travis.yml

@@ -57,6 +57,9 @@ matrix:
       jdk: openjdk6
     - scala: 2.13.0-M5
       jdk: openjdk6
+  include:
+    - env: SCALANATIVE_VERSION=0.3.8
+      jdk: oraclejdk8
 
 notifications:
   email:

admin/build.sh

@@ -17,15 +17,21 @@ set -e
 # of the existing tag. Then a new tag can be created for that commit, e.g., `v1.2.3#2.13.0-M5`.
 # Everything after the `#` in the tag name is ignored.
 
-if [[ "$TRAVIS_JDK_VERSION" == "openjdk6" && "$TRAVIS_SCALA_VERSION" =~ 2\.11\..* \
+if [[ "$SCALANATIVE_VERSION" != "" ]]; then
+  if [[ "$TRAVIS_JDK_VERSION" == "oraclejdk8" && "$TRAVIS_SCALA_VERSION" =~ 2\.11\..* ]]; then
+    RELEASE_COMBO=true;
+  fi
+elif [[ "$TRAVIS_JDK_VERSION" == "openjdk6" && "$TRAVIS_SCALA_VERSION" =~ 2\.11\..* \
       || "$TRAVIS_JDK_VERSION" == "oraclejdk8" && "$TRAVIS_SCALA_VERSION" =~ 2\.1[23]\..* ]]; then
   RELEASE_COMBO=true;
 fi
 
-if [ "$SCALAJS_VERSION" = "" ]; then
-  projectPrefix="scala-parser-combinators"
-else
+if ! [ "$SCALAJS_VERSION" == "" ]; then
   projectPrefix="scala-parser-combinatorsJS"
+elif ! [ "$SCALANATIVE_VERSION" == "" ]; then
+  projectPrefix="scala-parser-combinatorsNative"
+else
+  projectPrefix="scala-parser-combinators"
 fi
 
 verPat="[0-9]+\.[0-9]+\.[0-9]+(-[A-Za-z0-9-]+)?"

build.sbt

@@ -4,10 +4,10 @@ import sbtcrossproject.crossProject
 crossScalaVersions in ThisBuild := List("2.12.7", "2.11.12", "2.13.0-M5")
 
 lazy val root = project.in(file("."))
-  .aggregate(`scala-parser-combinatorsJS`, `scala-parser-combinatorsJVM`)
+  .aggregate(`scala-parser-combinatorsJS`, `scala-parser-combinatorsJVM`, `scala-parser-combinatorsNative`)
   .settings(disablePublishing)
 
-lazy val `scala-parser-combinators` = crossProject(JSPlatform, JVMPlatform).
+lazy val `scala-parser-combinators` = crossProject(JSPlatform, JVMPlatform, NativePlatform).
   withoutSuffixFor(JVMPlatform).in(file(".")).
   settings(scalaModuleSettings: _*).
   jvmSettings(scalaModuleSettingsJVM).
@@ -48,7 +48,17 @@ lazy val `scala-parser-combinators` = crossProject(JSPlatform, JVMPlatform).
     // Scala.js cannot run forked tests
     fork in Test := false
   ).
-  jsConfigure(_.enablePlugins(ScalaJSJUnitPlugin))
+  jsConfigure(_.enablePlugins(ScalaJSJUnitPlugin)).
+  nativeSettings(
+    skip in compile := System.getProperty("java.version").startsWith("1.6") || !scalaVersion.value.startsWith("2.11"),
+    test := {},
+    libraryDependencies := {
+      if (!scalaVersion.value.startsWith("2.11"))
+        libraryDependencies.value.filterNot(_.organization == "org.scala-native")
+      else libraryDependencies.value
+    }
+  )
 
 lazy val `scala-parser-combinatorsJVM` = `scala-parser-combinators`.jvm
 lazy val `scala-parser-combinatorsJS` = `scala-parser-combinators`.js
+lazy val `scala-parser-combinatorsNative` = `scala-parser-combinators`.native

native/src/main/scala/scala/util/parsing/input/PositionCache.scala

@@ -0,0 +1,14 @@
+package scala.util.parsing.input
+
+import java.lang.CharSequence
+import java.util.{AbstractMap, Collections}
+
+private[input] trait PositionCache {
+  private[input] lazy val indexCache: java.util.Map[CharSequence,Array[Int]] = new AbstractMap[CharSequence, Array[Int]] {
+
+    override def entrySet() = Collections.emptySet()
+
+    // the /dev/null of Maps
+    override def put(ch: CharSequence, a: Array[Int]) = null
+  }
+}

project/plugins.sbt

@@ -12,4 +12,11 @@ val scalaJSVersion =
 
 addSbtPlugin("org.scala-js" % "sbt-scalajs" % scalaJSVersion)
 
+val scalaNativeVersion =
+  Option(System.getenv("SCALANATIVE_VERSION")).filter(_.nonEmpty).getOrElse("0.3.8")
+
+addSbtPlugin("org.scala-native" % "sbt-scala-native" % scalaNativeVersion)
+
 addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "0.6.0")
+
+addSbtPlugin("org.portable-scala" % "sbt-scala-native-crossproject" % "0.6.0")