JarCastingBabelfish Scala client 
This is a Scala/JNI implementation of the Babelfish client. It uses ScalaPB for Protobuf/gRPC code generation and libuast for XPath queries.
Status
The latest scala-client v2.x supports the UASTv2 protocol.
Installation
Requirements
Java SDK 8
You need to install the Java SDK and its header files. The command for Debian and derived distributions would be:
sudo apt install openjdk-8 openjdk-8-jdk-headless
Scala 2.11
Currently we support Scala 2.11. We recommend using scalaVersion := "2.11.11" or above in your build.sbt file. This library is not compatible with Scala 2.12 or 2.13.
Building from sources
git clone https://github.com/bblfsh/scala-client.git
cd scala-client
./build.sh --clean --get-dependencies --all
This command would fetch dependencies for the package, compile native code (JNI) and the Scala code. gRPC/protobuf files are re-generate from src/main/proto on every ./sbt compile and are stored under ./target/src_managed/.
The jar file and the native module are generated in the build/ directory. If you move the jar file to some other path, the native (.so or .dylib) library must be in the same path.
If the build fails because it can't find the jni.h header file, run it setting JAVA_HOME (appropriately setting it to the right location for your system):
export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
./build.sh --clean --get-dependencies --all
If the build fails with: build.sh: Permission denied, add execution permissions to the script:
chmod +x ./build.sh
build.sh script has been tested in Unix (Linux and macOS) and with Git Bash in Windows.
For more developer documentation please check our CONTRIBUTING guideline.
Apache Maven
The bblfsh-client package is available thorugh Maven central, so it can be easily added as a dependency in various package management systems. Examples of how to handle it for most common systems are included below; for other systems just look at Maven central's dependency information.
<dependency>
<groupId>org.bblfsh</groupId>
<artifactId>bblfsh-client</artifactId>
<version>${version}</version>
</dependency>
Scala sbt
libraryDependencies += "org.bblfsh" % "bblfsh-client" % version
Usage
If you don't have a bblfsh server running you can execute it using the following command:
docker run --privileged --rm -it -p 9432:9432 --name bblfsh bblfsh/bblfshd
Please, read the getting started guide to learn more about how to use and deploy a bblfsh server, install language drivers, etc.
API
import scala.io.Source
import org.bblfsh.client.v2.BblfshClient, BblfshClient._
import gopkg.in.bblfsh.sdk.v2.protocol.driver.Mode
val client = BblfshClient("localhost", 9432)
val filename = "/path/to/file.py" // client responsible for encoding it to utf-8
val fileContent = Source.fromFile(filename).getLines.mkString("\n")
val resp = client.parse(filename, fileContent, Mode.SEMANTIC)
// Full response
println(resp.get)
// Filtered response
val it = client.filter(resp.get, "//uast:Identifier")
it.foreach(println)
Please read the Babelfish clients guide section to learn more about babelfish clients and their query language.
License
Apache 2.0
