Base kernel implementation

.gitignore

@@ -0,0 +1,3 @@
+.gradle/
+.idea/
+build/

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2017 Spencer Park
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# Jupyter Java Kernel
+
+A java
+
+### Requirements
+
+*   `jdk-9`, **NOT** `jre`. The kernel uses the jshell tool and by extension the java compiler

build.gradle

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+import org.apache.tools.ant.filters.ReplaceTokens
+
+buildscript {
+    repositories {
+        mavenLocal()
+    }
+    dependencies {
+        classpath 'io.github.spencerpark:jupyter-kernel-installer:1.0.1'
+    }
+}
+
+plugins {
+    id 'com.github.hierynomus.license' version '0.14.0'
+}
+
+apply plugin: 'java'
+apply plugin: 'maven-publish'
+apply plugin: 'io.github.spencerpark.jupyter-kernel-installer'
+
+group 'io.github.spencerpark'
+version '1.0-SNAPSHOT'
+
+task wrapper(type: Wrapper) {
+    gradleVersion = '4.1'
+}
+
+compileJava {
+    sourceCompatibility = 1.9
+    targetCompatibility = 1.9
+}
+
+configurations {
+    shade
+    shade.transitive = false
+    compile.extendsFrom(shade)
+}
+
+repositories {
+    mavenLocal()
+    mavenCentral()
+}
+
+dependencies {
+    shade group: 'io.github.spencerpark', name: 'jupyter-jvm-basekernel', version: '1.0.3-SNAPSHOT'
+
+    testCompile group: 'junit', name: 'junit', version: '4.12'
+}
+
+jar {
+    //Include all shaded dependencies in the jar
+    from configurations.shade
+            .collect {it.isDirectory() ? it : zipTree(it)}
+
+    manifest {
+        attributes('Main-class': 'io.github.spencerpark.IJava')
+    }
+}
+
+processResources {
+    def tokens = [
+            'version': project.version,
+            'project': project.name
+    ]
+    inputs.properties(tokens)
+    filter ReplaceTokens, tokens: tokens
+}
+
+publishing {
+    publications {
+        mavenJava(MavenPublication) {
+            from components.java
+        }
+    }
+}
+
+jupyter {
+    kernelDisplayName = 'Java'
+    kernelLanguage = 'java'
+}

gradle/wrapper/gradle-wrapper.properties

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+#Sat Sep 30 20:02:10 EDT 2017
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip

gradlew

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+#!/usr/bin/env sh
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=$(save "$@")
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+  cd "$(dirname "$0")"
+fi
+
+exec "$JAVACMD" "$@"

gradlew.bat

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+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle

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+rootProject.name = 'jupyter-java-kernel'

src/main/java/io/github/spencerpark/IJava.java

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+/**
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Spencer Park
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package io.github.spencerpark;
+
+import io.github.spencerpark.jupyter.channels.JupyterConnection;
+import io.github.spencerpark.jupyter.channels.JupyterSocket;
+import io.github.spencerpark.jupyter.kernel.KernelConnectionProperties;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.logging.Level;
+
+public class IJava {
+    public static void main(String[] args) throws Exception {
+        if (args.length < 1)
+            throw new IllegalArgumentException("Missing connection file argument");
+
+        Path connectionFile = Paths.get(args[0]);
+
+        if (!Files.isRegularFile(connectionFile))
+            throw new IllegalArgumentException("Connection file '" + connectionFile + "' isn't a file.");
+
+        String contents = new String(Files.readAllBytes(connectionFile));
+
+        JupyterSocket.JUPYTER_LOGGER.setLevel(Level.WARNING);
+
+        KernelConnectionProperties connProps = KernelConnectionProperties.parse(contents);
+        JupyterConnection connection = new JupyterConnection(connProps);
+
+        JavaKernel kernel = new JavaKernel();
+        kernel.becomeHandlerForConnection(connection);
+
+        connection.connect();
+        connection.waitUntilClose();
+    }
+}

src/main/java/io/github/spencerpark/JavaKernel.java

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+/**
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Spencer Park
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package io.github.spencerpark;
+
+import io.github.spencerpark.jupyter.kernel.BaseKernel;
+import io.github.spencerpark.jupyter.kernel.LanguageInfo;
+import io.github.spencerpark.jupyter.kernel.ReplacementOptions;
+import io.github.spencerpark.jupyter.kernel.util.CharPredicate;
+import io.github.spencerpark.jupyter.messages.MIMEBundle;
+import jdk.jshell.JShell;
+import jdk.jshell.JShellException;
+import jdk.jshell.SnippetEvent;
+import jdk.jshell.SourceCodeAnalysis;
+
+import java.io.OutputStream;
+import java.io.PrintStream;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class JavaKernel extends BaseKernel {
+    private static OutputStream stdout = new OutputStream() {
+        @Override
+        public void write(int b) {
+            System.out.write(b);
+        }
+    };
+    private static OutputStream stderr = new OutputStream() {
+        @Override
+        public void write(int b) {
+            System.err.write(b);
+        }
+    };
+    private static final CharPredicate IDENTIFIER_CHAR = CharPredicate.builder()
+            .inRange('a', 'z')
+            .inRange('A', 'Z')
+            .inRange('0', '9')
+            .match('_')
+            .build();
+    private static final CharPredicate WS = CharPredicate.anyOf(" \t\n\r");
+
+    private final JShell shell;
+    private final SourceCodeAnalysis sourceAnalyzer;
+
+    private final LanguageInfo languageInfo;
+    private final String banner;
+    private final List<LanguageInfo.Help> helpLinks;
+
+    public JavaKernel() {
+        this.shell = JShell.builder()
+                .out(new PrintStream(stdout))
+                .err(new PrintStream(stderr))
+                .build();
+        this.sourceAnalyzer = this.shell.sourceCodeAnalysis();
+        this.languageInfo = new LanguageInfo.Builder("Java")
+                .version(Runtime.version().toString())
+                .mimetype("text/x-java-source")
+                .fileExtension(".java")
+                .pygments("java")
+                .codemirror("java")
+                .build();
+        this.banner = String.format("Java %s", Runtime.version());
+        this.helpLinks = List.of(
+                new LanguageInfo.Help("Java", "https://docs.oracle.com/javase/tutorial/java/nutsandbolts/index.html")
+        );
+    }
+
+    @Override
+    public LanguageInfo getLanguageInfo() {
+        return this.languageInfo;
+    }
+
+    @Override
+    public String getBanner() {
+        return this.banner;
+    }
+
+    @Override
+    public List<LanguageInfo.Help> getHelpLinks() {
+        return this.helpLinks;
+    }
+
+    private SourceCodeAnalysis.CompletionInfo analyzeCompletion(String source) {
+        return this.sourceAnalyzer.analyzeCompletion(source);
+    }
+
+    @Override
+    public MIMEBundle eval(String expr) throws Exception {
+        String lastEvalResult = null;
+        SourceCodeAnalysis.CompletionInfo info;
+        for (info = analyzeCompletion(expr); info.completeness().isComplete(); info = analyzeCompletion(info.remaining())) {
+            String src = info.source();
+            for (SnippetEvent event : this.shell.eval(src)) {
+                if (event.causeSnippet() == null) {
+                    // Fresh snippet
+                    JShellException e = event.exception();
+                    if (e != null)
+                        throw e;
+
+                    if (!event.status().isDefined()) {
+                        throw new IllegalArgumentException("Cannot compile '" + event.snippet().source() + "'");
+                    }
+
+                    lastEvalResult = event.value();
+                }
+            }
+        }
+
+        if (info.completeness() != SourceCodeAnalysis.Completeness.EMPTY) {
+            // There is source that was not evaluated because it was not complete
+            // TODO raise a better exception
+            throw new IllegalArgumentException(String.format("Incomplete source code: '%s'", info.remaining()));
+        }
+
+        return lastEvalResult == null || lastEvalResult.isEmpty() ? null : new MIMEBundle(lastEvalResult);
+    }
+
+    @Override
+    public MIMEBundle inspect(String code, int at, boolean extraDetail) {
+        // Move the code position to the end of the identifier to make the inspection work at any
+        // point in the identifier. i.e "System.o|ut" or "System.out|" will return the same result.
+        while (at + 1 < code.length() && IDENTIFIER_CHAR.test(code.charAt(at + 1))) at++;
+
+        // If the next non-whitespace character is an opening paren '(' then this must be included
+        // in the documentation search to ensure it searches for a method call.
+        int parenIdx = at;
+        while (parenIdx + 1 < code.length() && WS.test(code.charAt(parenIdx + 1))) parenIdx++;
+        if (parenIdx + 1 < code.length() && code.charAt(parenIdx + 1) == '(') at = parenIdx + 1;
+
+        List<SourceCodeAnalysis.Documentation> documentations = this.sourceAnalyzer.documentation(code, at, extraDetail);
+        if (documentations == null || documentations.isEmpty()) {
+            return null;
+        }
+
+        MIMEBundle fmtDocs = new MIMEBundle(
+                documentations.stream()
+                        .map(doc -> {
+                            String formatted = doc.signature();
+
+                            String javadoc = doc.javadoc();
+                            if (javadoc != null) formatted += '\n' + javadoc;
+
+                            return formatted;
+                        }).collect(Collectors.joining("\n\n")
+                )
+        );
+
+        fmtDocs.putHTML(
+                documentations.stream()
+                        .map(doc -> {
+                            String formatted = doc.signature();
+
+                            // TODO consider compiling the javadoc to html for pretty printing
+                            String javadoc = doc.javadoc();
+                            if (javadoc != null) formatted += "<br/>" + javadoc;
+
+                            return formatted;
+                        }).collect(Collectors.joining("<br/><br/>")
+                )
+        );
+
+        return fmtDocs;
+    }
+
+    @Override
+    public ReplacementOptions complete(String code, int at) {
+        int[] end = new int[1]; // As of now this is always the same as the cursor...
+        List<SourceCodeAnalysis.Suggestion> suggestions = this.sourceAnalyzer.completionSuggestions(code, at, end);
+        if (suggestions == null || suggestions.isEmpty()) return null;
+
+        List<String> options = suggestions.stream()
+                .sorted((s1, s2) ->
+                        s1.matchesType()
+                                ? s2.matchesType() ? 0 : -1
+                                : s2.matchesType() ? 1 : 0
+                )
+                .map(SourceCodeAnalysis.Suggestion::continuation)
+                .collect(Collectors.toList());
+
+        return new ReplacementOptions(options, at, end[0]);
+    }
+
+    @Override
+    public String isComplete(String code) {
+        return super.isComplete(code);
+    }
+
+    @Override
+    public void onShutdown(boolean isRestarting) {
+        this.shell.close();
+    }
+}