| // Copyright (C) 2013 The Android Open Source Project |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| package com.googlesource.gerrit.plugins.scripting.scala; |
| |
| import static scala.collection.JavaConversions.asScalaBuffer; |
| |
| import com.google.common.base.Function; |
| import com.google.common.base.Joiner; |
| import com.google.common.collect.Lists; |
| import com.google.common.collect.Sets; |
| import com.google.inject.Inject; |
| import java.io.IOException; |
| import java.nio.charset.Charset; |
| import java.nio.file.FileVisitOption; |
| import java.nio.file.FileVisitResult; |
| import java.nio.file.Files; |
| import java.nio.file.Path; |
| import java.nio.file.SimpleFileVisitor; |
| import java.nio.file.attribute.BasicFileAttributes; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.EnumSet; |
| import java.util.List; |
| import java.util.Set; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import scala.Char; |
| import scala.Option; |
| import scala.Tuple2; |
| import scala.collection.Iterator; |
| import scala.collection.immutable.Seq; |
| import scala.collection.mutable.Map; |
| import scala.reflect.internal.util.BatchSourceFile; |
| import scala.reflect.internal.util.SourceFile; |
| import scala.reflect.io.AbstractFile; |
| import scala.reflect.io.VirtualDirectory; |
| import scala.tools.nsc.Global; |
| import scala.tools.nsc.Global.Run; |
| |
| public class ScalaPluginScriptEngine { |
| private static final Logger LOG = LoggerFactory.getLogger(ScalaPluginScriptEngine.class); |
| |
| // private final IMain scalaEngine; |
| private final ScalaClassLoader classLoader; |
| private Global globalEngine; |
| private ScalaReporter reporter; |
| |
| public class ScalaClassLoader extends ClassLoader { |
| private static final String CLASS_EXTENSION = ".class"; |
| private Map<String, AbstractFile> scalaClasses; |
| |
| public ScalaClassLoader(ScalaSettings settings) { |
| super(ScalaClassLoader.class.getClassLoader()); |
| scalaClasses = settings.getVirtualDirectory().scala$reflect$io$VirtualDirectory$$files(); |
| } |
| |
| @Override |
| protected Class<?> findClass(String name) throws ClassNotFoundException { |
| AbstractFile classFile = getClassFile(name, scalaClasses); |
| byte[] ba; |
| try { |
| ba = classFile.toByteArray(); |
| return defineClass(name, ba, 0, ba.length); |
| } catch (IOException e) { |
| throw new ClassNotFoundException("Cannot open Scala class file " + classFile, e); |
| } |
| } |
| |
| private AbstractFile getClassFile(String fullClassName, Map<String, AbstractFile> tree) |
| throws ClassNotFoundException { |
| String[] nameComponents = fullClassName.split("\\."); |
| nameComponents[nameComponents.length - 1] = |
| nameComponents[nameComponents.length - 1] + CLASS_EXTENSION; |
| for (String component : nameComponents) { |
| Option<AbstractFile> node = tree.get(component); |
| if (node.isEmpty()) { |
| throw new ClassNotFoundException( |
| "Cannot find compiled Scala code for class " |
| + fullClassName |
| + ": " |
| + component |
| + " is unknown"); |
| } |
| |
| AbstractFile abstractFile = node.get(); |
| if (component.endsWith(CLASS_EXTENSION)) { |
| return abstractFile; |
| } else { |
| tree = ((VirtualDirectory) abstractFile).scala$reflect$io$VirtualDirectory$$files(); |
| } |
| } |
| throw new ClassNotFoundException( |
| "Cannot find compiled Scala code for class " + fullClassName); |
| } |
| |
| public Set<String> getAllLoadedClassNames() { |
| return scanTree("", scalaClasses); |
| } |
| |
| private Set<String> scanTree(String packageName, Map<String, AbstractFile> tree) { |
| Set<String> classNames = Sets.newHashSet(); |
| for (Iterator<Tuple2<String, AbstractFile>> keysIter = tree.toIterator(); |
| keysIter.hasNext(); ) { |
| Tuple2<String, AbstractFile> node = keysIter.next(); |
| String fileName = node._1; |
| AbstractFile fileContent = node._2; |
| |
| if (fileName.endsWith(CLASS_EXTENSION)) { |
| classNames.add( |
| nameWithPackage( |
| packageName, |
| fileName.substring(0, fileName.length() - CLASS_EXTENSION.length()))); |
| |
| } else if (VirtualDirectory.class.isAssignableFrom(fileContent.getClass())) { |
| VirtualDirectory subNode = (VirtualDirectory) node._2; |
| classNames.addAll( |
| scanTree( |
| nameWithPackage(packageName, fileName), |
| subNode.scala$reflect$io$VirtualDirectory$$files())); |
| } |
| } |
| return classNames; |
| } |
| |
| private String nameWithPackage(String packageName, String packageMember) { |
| if (packageName.length() <= 0) { |
| return packageMember; |
| } else { |
| return packageName + "." + packageMember; |
| } |
| } |
| } |
| |
| @Inject |
| public ScalaPluginScriptEngine(ScalaSettings settings, ScalaReporter reporter) { |
| this.classLoader = new ScalaClassLoader(settings); |
| globalEngine = new Global(settings.getSettings(), reporter.getConsoleReporter()); |
| this.reporter = reporter; |
| } |
| |
| public Set<Class<?>> eval(Path scalaFile) throws IOException, ClassNotFoundException { |
| if (Files.isRegularFile(scalaFile)) { |
| return evalFiles(Arrays.asList(scalaFile)); |
| } else if (Files.isDirectory(scalaFile)) { |
| return evalDirectory(scalaFile); |
| } else { |
| throw new IOException("File " + scalaFile + " is not a supported for loading Scala scripts"); |
| } |
| } |
| |
| private Set<Class<?>> evalDirectory(Path scalaFile) throws IOException, ClassNotFoundException { |
| final List<Path> scalaFiles = Lists.newArrayList(); |
| |
| Files.walkFileTree( |
| scalaFile, |
| EnumSet.of(FileVisitOption.FOLLOW_LINKS), |
| Integer.MAX_VALUE, |
| new SimpleFileVisitor<Path>() { |
| @Override |
| public FileVisitResult visitFile(Path path, BasicFileAttributes attrs) |
| throws IOException { |
| String fileName = path.getFileName().toString(); |
| if (Files.isRegularFile(path) |
| && fileName.endsWith(ScalaPluginProvider.SCALA_EXTENSION)) { |
| scalaFiles.add(path); |
| } |
| return FileVisitResult.CONTINUE; |
| } |
| }); |
| return evalFiles(scalaFiles); |
| } |
| |
| private Set<Class<?>> evalFiles(List<Path> scalaFiles) |
| throws IOException, ClassNotFoundException { |
| Set<Class<?>> classes = Sets.newHashSet(); |
| |
| List<SourceFile> scalaSourceFiles = |
| Lists.transform( |
| scalaFiles, |
| new Function<Path, SourceFile>() { |
| @Override |
| public SourceFile apply(Path scalaFile) { |
| try { |
| return new BatchSourceFile(scalaFile.toString(), readScalaFile(scalaFile)); |
| } catch (IOException e) { |
| throw new IllegalArgumentException("Cannot load scala file " + scalaFile, e); |
| } |
| } |
| }); |
| Run run = globalEngine.new Run(); |
| reporter.reset(); |
| run.compileSources(asScalaBuffer(scalaSourceFiles).toList()); |
| if (reporter.hasErrors()) { |
| LOG.error("Error compiling scala files " + scalaFiles); |
| LOG.error(reporter.getOutput()); |
| throw new IOException("Invalid Scala files " + scalaFiles); |
| } else { |
| String output = reporter.getOutput(); |
| if (output.length() > 0) { |
| LOG.info("Scala files " + scalaFiles + " loaded successfully"); |
| LOG.info(output); |
| } |
| } |
| |
| for (String className : classLoader.getAllLoadedClassNames()) { |
| Class<?> clazz = classLoader.loadClass(className); |
| classes.add(clazz); |
| } |
| return classes; |
| } |
| |
| private Seq<Object> readScalaFile(Path scalaFile) throws IOException { |
| List<String> scalaFileLines = Files.readAllLines(scalaFile, Charset.forName("UTF-8")); |
| String scalaCode = Joiner.on('\n').join(scalaFileLines); |
| |
| List<Object> chars = new ArrayList<>(); |
| for (char c : scalaCode.toString().toCharArray()) { |
| chars.add(Char.unbox(c)); |
| } |
| |
| return asScalaBuffer(chars).toList(); |
| } |
| |
| public ScalaClassLoader getClassLoader() { |
| return classLoader; |
| } |
| } |