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Diff for: ‎pom.xml

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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.github.scalatojava</groupId>
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<artifactId>scala-to-java</artifactId>
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<version>1.0</version>
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<packaging>jar</packaging>
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<properties>
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<scala.version>2.11.4</scala.version>
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</properties>
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<repositories>
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<repository>
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<id>scala-tools.org</id>
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<name>Scala-Tools Maven2 Repository</name>
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<url>http://scala-tools.org/repo-releases</url>
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</repository>
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</repositories>
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<pluginRepositories>
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<pluginRepository>
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<id>scala-tools.org</id>
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<name>Scala-Tools Maven2 Repository</name>
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<url>http://scala-tools.org/repo-releases</url>
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</pluginRepository>
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</pluginRepositories>
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<dependencies>
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<dependency>
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<groupId>org.scala-lang</groupId>
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<artifactId>scala-library</artifactId>
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<version>${scala.version}</version>
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</dependency>
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<dependency>
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<groupId>org.scala-lang</groupId>
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<artifactId>scala-compiler</artifactId>
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<version>${scala.version}</version>
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</dependency>
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<dependency>
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<groupId>org.scala-lang</groupId>
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<artifactId>scala-reflect</artifactId>
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<version>${scala.version}</version>
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</dependency>
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<dependency>
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<groupId>org.bitbucket.mstrobel</groupId>
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<artifactId>procyon-compilertools</artifactId>
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<version>0.5.29</version>
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</dependency>
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<dependency>
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<groupId>org.scalatest</groupId>
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<artifactId>scalatest_2.11</artifactId>
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<version>2.2.5</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>3.3</version>
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<configuration>
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<source>1.8</source>
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<target>1.8</target>
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</configuration>
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</plugin>
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<plugin>
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<groupId>org.scala-tools</groupId>
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<artifactId>maven-scala-plugin</artifactId>
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<version>2.15.2</version>
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<executions>
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<execution>
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<goals>
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<goal>compile</goal>
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<goal>testCompile</goal>
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</goals>
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</execution>
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</executions>
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<configuration>
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<scalaVersion>${scala.version}</scalaVersion>
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<args>
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<arg>-target:jvm-1.8</arg>
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</args>
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</configuration>
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</plugin>
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<!--disable surefire -->
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-surefire-plugin</artifactId>
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<version>2.7</version>
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<configuration>
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<skipTests>true</skipTests>
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</configuration>
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</plugin>
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<!--enable scalatest -->
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<plugin>
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<groupId>org.scalatest</groupId>
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<artifactId>scalatest-maven-plugin</artifactId>
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<version>1.0</version>
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<configuration>
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<reportsDirectory>
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${project.build.directory}/surefire-reports
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</reportsDirectory>
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<junitxml>.</junitxml>
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<filereports>WDF TestSuite.txt</filereports>
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</configuration>
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<executions>
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<execution>
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<id>test</id>
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<goals>
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<goal>test</goal>
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</goals>
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</execution>
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</executions>
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</plugin>
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<plugin>
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<executions>
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<execution>
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<id>make-assembly</id>
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<phase>package</phase>
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<goals>
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<goal>single</goal>
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</goals>
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</execution>
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</executions>
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<artifactId>maven-assembly-plugin</artifactId>
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<version>2.5.5</version>
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<configuration>
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<archive>
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<manifest>
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<mainClass>com.github.scalatojava.Main</mainClass>
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</manifest>
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</archive>
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<descriptorRefs>
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<descriptorRef>jar-with-dependencies</descriptorRef>
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</descriptorRefs>
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<finalName>scala-to-java</finalName>
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<appendAssemblyId>false</appendAssemblyId>
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</configuration>
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</plugin>
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</plugins>
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</build>
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<reporting>
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<plugins>
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<plugin>
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<groupId>org.scala-tools</groupId>
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<artifactId>maven-scala-plugin</artifactId>
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<configuration>
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<scalaVersion>${scala.version}</scalaVersion>
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</configuration>
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</plugin>
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</plugins>
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</reporting>
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</project>

Diff for: ‎readme.md

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Scala To Java
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---------
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Simple tool written in Scala that reveals the mystery of scala compiler.
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Reads scala code from the StdIn and writes it's decompiled Java version
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to StdOut.
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Usage
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---
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* Make sure you have Java 1.8 and Maven installed
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* Checkout the project
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* In project directory invoke `mvn clean package`.
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In target directory `scala-to-java.jar` will be created
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* Run application with `java -jar target/scala-to-java.jar`
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* Type any scala code, for example `println("hello, world")`
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and finish with `END` character (`Ctrl-D`)
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Source highlighting and more
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---
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To improve usage experience, you may want to use external source code
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highlighter (like `pygmentize`) and `pv` as the indicator of transpiling
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process.
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My setup:
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```sh
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alias scala-to-java='java -jar ~/.scala-to-java.jar | pv -W | pygmentize -f
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256 -l java -O style=monokai'
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```
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Credits
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---
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Thanks to [Stanley Shyiko](https://github.com/shyiko), who
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actually implemented all the magic.

Diff for: ‎src/main/scala/com/github/scalatojava/Main.scala

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package com.github.scalatojava
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/**
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* @author <a href="mailto:[email protected]">Ivan Zaytsev</a>
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* 2015-07-12
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*/
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object Main extends App {
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val source = Iterator.continually(scala.io.StdIn.readLine()).takeWhile(
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_ != null).mkString("\n")
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println()
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private val java = ScalaToJava(source)
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println(java.replaceFirst("(?s)public final class _\\$\\s+.*", ""))
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}

Diff for: ‎src/main/scala/com/github/scalatojava/ScalaToJava.scala

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package com.github.scalatojava
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import java.io.{File, StringWriter}
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import java.nio.file.{Paths, Files}
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import com.strobel.assembler.InputTypeLoader
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import com.strobel.assembler.metadata._
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import com.strobel.decompiler.languages.Languages
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import com.strobel.decompiler.languages.java.JavaFormattingOptions
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import com.strobel.decompiler.{PlainTextOutput, DecompilerSettings, DecompilationOptions}
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import scala.collection.mutable
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import scala.tools.nsc._
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import java.io._
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import java.util.Arrays
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/**
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* Scala-to-Java translator
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* @author <a href="mailto:[email protected]">Stanley Shyiko</a>
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*/
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object ScalaToJava {
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def decompile(file: File): String = {
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val settings = new DecompilerSettings
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settings.setLanguage(Languages.java)
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settings.setTypeLoader(new InputTypeLoader)
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settings.setFormattingOptions(JavaFormattingOptions.createDefault)
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val options = new DecompilationOptions
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options.setSettings(settings)
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options.setFullDecompilation(true)
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settings.getTypeLoader.tryLoadType(file.getPath,
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new Buffer(Files.readAllBytes(Paths.get(file.getPath))))
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val metadataSystem = new NoRetryMetadataSystem(settings.getTypeLoader)
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val resolvedType = metadataSystem.resolveType(file.getName.substring(0,
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file.getName.length - ".class".length), mightBePrimitive = false)
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val writer = new StringWriter
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val output = new PlainTextOutput(writer)
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settings.getLanguage.decompileType(resolvedType, output, options)
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writer.flush()
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writer.toString
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}
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def compile(input: File, output: File): Array[File] = {
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val settings = new Settings
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settings processArgumentString "-Xscript _ -usejavacp -d " + output.getPath
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val compiler = new Global(settings)
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val runner = new compiler.Run
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runner.compile(List(input.getPath))
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output.listFiles(new FilenameFilter {
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override def accept(dir: File, name: String): Boolean = name.endsWith(".class")
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})
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}
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def apply(value: String): String = {
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val output = Files.createTempDirectory("s2j").toFile
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val input = new File(output, "_.scala")
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Files.write(input.toPath, Arrays.asList(value))
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compile(input, output).map(decompile).mkString("\n\n")
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}
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class NoRetryMetadataSystem(typeLoader: ITypeLoader) extends MetadataSystem(typeLoader) {
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val failedTypes = mutable.Set[String]()
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override def resolveType(descriptor: String, mightBePrimitive: Boolean): TypeDefinition = {
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if (failedTypes.contains(descriptor)) {
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return null
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}
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val r = super.resolveType(descriptor, mightBePrimitive)
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if (r == null) {
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failedTypes.add(descriptor)
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}
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r
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}
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}
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}
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Diff for: ‎src/test/scala/com/github/scalatojava/ScalaToJavaSpec.scala

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package com.github.scalatojava
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import org.scalatest._
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class ScalaToJavaSpec extends FlatSpec with Matchers {
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it should "be able to convert scala to java" in {
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ScalaToJava("""println("hello world")""") should include("class _")
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}
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}

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