initial commit

.editorconfig

+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = space
+insert_final_newline = true
+max_line_length = 120
+tab_width = 4
+trim_trailing_whitespace = true
+
+[{*.jadd,*.java,*.jrag}]
+indent_size = 2
+tab_width = 2

.gitignore

+# Created by .ignore support plugin (hsz.mobi)
+### Gradle template
+.gradle
+**/build/
+!src/**/build/
+
+# Ignore Gradle GUI config
+gradle-app.setting
+
+# Avoid ignoring Gradle wrapper jar file (.jar files are usually ignored)
+!gradle-wrapper.jar
+
+# Cache of project
+.gradletasknamecache
+
+# # Work around https://youtrack.jetbrains.com/issue/IDEA-116898
+# gradle/wrapper/gradle-wrapper.properties
+
+# IntelliJ project files
+.idea
+*.iml
+out
+gen
+
+### Java template
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+

build.gradle

+plugins {
+    id 'java'
+    id 'org.jetbrains.intellij' version '0.6.5'
+    id "org.jetbrains.grammarkit" version "2020.3.2"
+    id 'idea'
+}
+
+group = "org.jastadd"
+version = "1.0-SNAPSHOT"
+
+repositories {
+    mavenCentral()
+}
+
+sourceSets {
+    main.java.srcDirs += "src/gen/java"
+}
+
+idea {
+    module {
+        generatedSourceDirs += file('src/gen/java')
+    }
+}
+
+dependencies {
+    testImplementation group: 'junit', name: 'junit', version: '4.12'
+}
+
+// See https://github.com/JetBrains/gradle-intellij-plugin/
+intellij {
+    version = "2020.2.4"
+}
+
+apply plugin: 'idea'
+apply plugin: 'org.jetbrains.grammarkit'
+
+
+import org.jetbrains.grammarkit.tasks.*
+
+grammarKit {
+    // version of IntelliJ patched JFlex (see bintray link below), Default is 1.7.0-1
+    jflexRelease = '1.7.0-1'
+
+    // tag or short commit hash of Grammar-Kit to use (see link below). Default is 2020.3.1
+    grammarKitRelease = '2020.3.1'
+}
+
+patchPluginXml {
+    changeNotes """
+      Add change notes here.<br>
+      <em>most HTML tags may be used</em>"""
+}
+
+task generateRelAstGrammarParser(type: GenerateParser) {
+
+    // source bnf file
+    source = "src/main/grammar/RelAstGrammar.bnf"
+
+    // optional, task-specific root for the generated files. Default: none
+    targetRoot = 'src/gen/java'
+
+    // path to a parser file, relative to the targetRoot
+    pathToParser = '/org/jastadd/tooling/RelAstGrammarParser.java'
+
+    // path to a directory with generated psi files, relative to the targetRoot
+    pathToPsiRoot = '/org/jastadd/tooling/psi'
+
+    // if set, plugin will remove a parser output file and psi output directory before generating new ones. Default: false
+    purgeOldFiles = true
+}
+
+task generateRelAstGrammarLexer(type: GenerateLexer) {
+
+    source = "src/main/grammar/RelAstGrammar.flex"
+
+    targetDir = 'src/gen/java/org/jastadd/tooling/lexer/'
+
+    targetClass = 'RelAstGrammarLexer'
+
+    purgeOldFiles = true
+}

gradle/wrapper/gradle-wrapper.properties

+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# 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
+#
+#      https://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.
+#
+
+##############################################################################
+##
+##  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 "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+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 or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; 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=`expr $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"
+
+exec "$JAVACMD" "$@"

gradlew.bat

+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@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 Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@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="-Xmx64m" "-Xms64m"
+
+@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

+rootProject.name = "JastAddGrammar"
+

src/main/grammar/RelAstGrammar.bnf

+{
+  parserClass="org.jastadd.tooling.parser.RelAstGrammarParser"
+
+  extends="com.intellij.extapi.psi.ASTWrapperPsiElement"
+
+  psiClassPrefix="RelAstGrammar"
+  psiImplClassSuffix="Impl"
+  psiPackage="org.jastadd.tooling.psi"
+  psiImplPackage="org.jastadd.tooling.psi.impl"
+
+  elementTypeHolderClass="org.jastadd.tooling.parser.RelAstGrammarTypes"
+  elementTypeClass="org.jastadd.tooling.parser.RelAstGrammarElementType"
+  tokenTypeClass="org.jastadd.tooling.parser.RelAstGrammarTokenType"
+}
+
+simpleFile ::= item_*
+
+private item_ ::= (property|COMMENT|CRLF)
+
+property ::= (KEY? SEPARATOR VALUE?) | KEY

src/main/grammar/RelAstGrammar.flex

+// Copyright 2000-2020 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+package org.jastadd.tooling.lexer;
+
+import com.intellij.lexer.FlexLexer;
+import com.intellij.psi.tree.IElementType;
+import org.jastadd.tooling.parser.RelAstGrammarTypes;
+import com.intellij.psi.TokenType;
+
+%%
+
+%class RelAstGrammarLexer
+%implements FlexLexer
+%unicode
+%function advance
+%type IElementType
+%eof{  return;
+%eof}
+
+CRLF=\R
+WHITE_SPACE=[\ \n\t\f]
+FIRST_VALUE_CHARACTER=[^ \n\f\\] | "\\"{CRLF} | "\\".
+VALUE_CHARACTER=[^\n\f\\] | "\\"{CRLF} | "\\".
+END_OF_LINE_COMMENT=("#"|"!")[^\r\n]*
+SEPARATOR=[:=]
+KEY_CHARACTER=[^:=\ \n\t\f\\] | "\\ "
+
+%state WAITING_VALUE
+
+%%
+
+<YYINITIAL> {END_OF_LINE_COMMENT}                           { yybegin(YYINITIAL); return RelAstGrammarTypes.COMMENT; }
+
+<YYINITIAL> {KEY_CHARACTER}+                                { yybegin(YYINITIAL); return RelAstGrammarTypes.KEY; }
+
+<YYINITIAL> {SEPARATOR}                                     { yybegin(WAITING_VALUE); return RelAstGrammarTypes.SEPARATOR; }
+
+<WAITING_VALUE> {CRLF}({CRLF}|{WHITE_SPACE})+               { yybegin(YYINITIAL); return TokenType.WHITE_SPACE; }
+
+<WAITING_VALUE> {WHITE_SPACE}+                              { yybegin(WAITING_VALUE); return TokenType.WHITE_SPACE; }
+
+<WAITING_VALUE> {FIRST_VALUE_CHARACTER}{VALUE_CHARACTER}*   { yybegin(YYINITIAL); return RelAstGrammarTypes.VALUE; }
+
+({CRLF}|{WHITE_SPACE})+                                     { yybegin(YYINITIAL); return TokenType.WHITE_SPACE; }
+
+[^]                                                         { return TokenType.BAD_CHARACTER; }

src/main/java/org/jastadd/tooling/JastAddIcons.java

+package org.jastadd.tooling;
+
+import com.intellij.openapi.util.IconLoader;
+
+import javax.swing.*;
+
+public class JastAddIcons {
+
+  public static final Icon FILE = IconLoader.getIcon("/icons/jastadd.png");
+
+}

src/main/java/org/jastadd/tooling/RelAstGrammar.java

+package org.jastadd.tooling;
+
+
+import com.intellij.lang.Language;
+
+public class RelAstGrammar extends Language {
+
+
+    public static final RelAstGrammar INSTANCE = new RelAstGrammar();
+
+    private RelAstGrammar() {
+      super("JastAddGrammar");
+    }
+
+
+}

src/main/java/org/jastadd/tooling/RelAstGrammarFileType.java

+package org.jastadd.tooling;
+
+import com.intellij.openapi.fileTypes.LanguageFileType;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import javax.swing.*;
+
+public class RelAstGrammarFileType extends LanguageFileType {
+
+  public static final RelAstGrammarFileType INSTANCE = new RelAstGrammarFileType();
+
+  private RelAstGrammarFileType() {
+    super(RelAstGrammar.INSTANCE);
+  }
+
+  @NotNull
+  @Override
+  public String getName() {
+    return "RelAst Grammar";
+  }
+
+  @NotNull
+  @Override
+  public String getDescription() {
+    return "Relational RAG grammar specification.";
+  }
+
+  @NotNull
+  @Override
+  public String getDefaultExtension() {
+    return "relast";
+  }
+
+
+
+  @Nullable
+  @Override
+  public Icon getIcon() {
+    return JastAddIcons.FILE;
+  }
+
+}

src/main/java/org/jastadd/tooling/lexer/RelAstGrammarFlexAdapter.java

+package org.jastadd.tooling.lexer;
+
+import com.intellij.lexer.FlexAdapter;
+
+public class RelAstGrammarFlexAdapter extends FlexAdapter {
+
+  public RelAstGrammarFlexAdapter() {
+    super(new RelAstGrammarLexer(null));
+  }
+
+}

src/main/java/org/jastadd/tooling/parser/RelAstGrammarElementType.java

+package org.jastadd.tooling.parser;
+
+import com.intellij.psi.tree.IElementType;
+import org.jastadd.tooling.RelAstGrammar;
+import org.jetbrains.annotations.NonNls;
+import org.jetbrains.annotations.NotNull;
+
+public class RelAstGrammarElementType extends IElementType {
+
+  public RelAstGrammarElementType(@NotNull @NonNls String debugName) {
+    super(debugName, RelAstGrammar.INSTANCE);
+  }
+
+}

src/main/java/org/jastadd/tooling/parser/RelAstGrammarParserDefinition.java

+package org.jastadd.tooling.parser;
+
+import com.intellij.lang.ASTNode;
+import com.intellij.lang.ParserDefinition;
+import com.intellij.lang.PsiParser;
+import com.intellij.lexer.Lexer;
+import com.intellij.openapi.project.Project;
+import com.intellij.psi.FileViewProvider;
+import com.intellij.psi.PsiElement;
+import com.intellij.psi.PsiFile;
+import com.intellij.psi.TokenType;
+import com.intellij.psi.tree.IFileElementType;
+import com.intellij.psi.tree.TokenSet;
+import org.jastadd.tooling.RelAstGrammar;
+import org.jastadd.tooling.lexer.RelAstGrammarFlexAdapter;
+import org.jastadd.tooling.psi.RelAstGrammarFile;
+import org.jetbrains.annotations.NotNull;
+
+
+public class RelAstGrammarParserDefinition implements ParserDefinition {
+
+  public static final TokenSet WHITE_SPACES = TokenSet.create(TokenType.WHITE_SPACE);
+  public static final TokenSet COMMENTS = TokenSet.create(RelAstGrammarTypes.COMMENT);
+
+  public static final IFileElementType FILE = new IFileElementType(RelAstGrammar.INSTANCE);
+
+  @NotNull
+  @Override
+  public Lexer createLexer(Project project) {
+    return new RelAstGrammarFlexAdapter();
+  }
+
+  @NotNull
+  @Override
+  public TokenSet getWhitespaceTokens() {
+    return WHITE_SPACES;
+  }
+
+  @NotNull
+  @Override
+  public TokenSet getCommentTokens() {
+    return COMMENTS;
+  }
+
+  @NotNull
+  @Override
+  public TokenSet getStringLiteralElements() {
+    return TokenSet.EMPTY;
+  }
+
+  @NotNull
+  @Override
+  public PsiParser createParser(final Project project) {
+    return new RelAstGrammarParser();
+  }
+
+  @Override
+  public IFileElementType getFileNodeType() {
+    return FILE;
+  }
+
+  @Override
+  public PsiFile createFile(FileViewProvider viewProvider) {
+    return new RelAstGrammarFile(viewProvider);
+  }
+
+  @Override
+  public SpaceRequirements spaceExistenceTypeBetweenTokens(ASTNode left, ASTNode right) {
+    return SpaceRequirements.MAY;
+  }
+
+  @NotNull
+  @Override
+  public PsiElement createElement(ASTNode node) {
+    return RelAstGrammarTypes.Factory.createElement(node);
+  }
+
+}

src/main/java/org/jastadd/tooling/parser/RelAstGrammarTokenType.java

+package org.jastadd.tooling.parser;
+
+import com.intellij.psi.tree.IElementType;
+import org.jastadd.tooling.RelAstGrammar;
+import org.jetbrains.annotations.NonNls;
+import org.jetbrains.annotations.NotNull;
+
+public class RelAstGrammarTokenType extends IElementType {
+
+  public RelAstGrammarTokenType(@NotNull @NonNls String debugName) {
+    super(debugName, RelAstGrammar.INSTANCE);
+  }
+
+  @Override
+  public String toString() {
+    return "RelAstGrammarTokenType." + super.toString();
+  }
+
+}

src/main/java/org/jastadd/tooling/psi/RelAstGrammarFile.java

+package org.jastadd.tooling.psi;
+
+import com.intellij.extapi.psi.PsiFileBase;
+import com.intellij.openapi.fileTypes.FileType;
+import com.intellij.psi.FileViewProvider;
+import org.jastadd.tooling.RelAstGrammar;
+import org.jastadd.tooling.RelAstGrammarFileType;
+import org.jetbrains.annotations.NotNull;
+
+public class RelAstGrammarFile extends PsiFileBase {
+
+  public RelAstGrammarFile(@NotNull FileViewProvider viewProvider) {
+    super(viewProvider, RelAstGrammar.INSTANCE);
+  }
+
+  @NotNull
+  @Override
+  public FileType getFileType() {
+    return RelAstGrammarFileType.INSTANCE;
+  }
+
+  @Override
+  public String toString() {
+    return "RelAst Grammar File";
+  }
+
+}

src/main/resources/META-INF/plugin.xml

+<idea-plugin>
+    <id>org.jastadd.JastAddGrammar</id>
+    <name>JastAdd Grammar Language</name>
+    <vendor email="johannes.mey@tu-dresden.de" url="jastadd.org">The JastAdd Team</vendor>
+
+    <description><![CDATA[
+    A plugin for JastAdd grammars specified in ast and relast files.
+    ]]></description>
+
+    <!-- please see https://www.jetbrains.org/intellij/sdk/docs/basics/getting_started/plugin_compatibility.html
+         on how to target different products -->
+    <depends>com.intellij.modules.platform</depends>
+
+    <extensions defaultExtensionNs="com.intellij">
+        <!-- Add your extensions here -->
+        <fileType name="RelAst Grammar" implementationClass="org.jastadd.tooling.RelAstGrammarFileType"
+                  fieldName="INSTANCE" language="JastAddGrammar" extensions="relast"/>
+        <lang.parserDefinition language="JastAddGrammar"
+                               implementationClass="org.jastadd.tooling.parser.RelAstGrammarParserDefinition"/>
+    </extensions>
+
+    <actions>
+        <!-- Add your actions here -->
+    </actions>
+</idea-plugin>

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