feat: initial commit, limited implementation of the annotation processor

13 files changed, 728 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..e0cca7a
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,145 @@
+# Created by https://www.toptal.com/developers/gitignore/api/gradle,java,intellij+all
+# Edit at https://www.toptal.com/developers/gitignore?templates=gradle,java,intellij+all
+
+### Intellij+all ###
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/**/usage.statistics.xml
+.idea/**/dictionaries
+.idea/**/shelf
+
+# AWS User-specific
+.idea/**/aws.xml
+
+# Generated files
+.idea/**/contentModel.xml
+
+# Sensitive or high-churn files
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/**/dbnavigator.xml
+
+# Gradle
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/artifacts
+# .idea/compiler.xml
+# .idea/jarRepositories.xml
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+# *.iml
+# *.ipr
+
+# CMake
+cmake-build-*/
+
+# Mongo Explorer plugin
+.idea/**/mongoSettings.xml
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# SonarLint plugin
+.idea/sonarlint/
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+# Editor-based Rest Client
+.idea/httpRequests
+
+# Android studio 3.1+ serialized cache file
+.idea/caches/build_file_checksums.ser
+
+### Intellij+all Patch ###
+# Ignore everything but code style settings and run configurations
+# that are supposed to be shared within teams.
+
+.idea/*
+
+!.idea/codeStyles
+!.idea/runConfigurations
+
+### Java ###
+# 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*
+replay_pid*
+
+### Gradle ###
+.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
+
+# Avoid ignore Gradle wrappper properties
+!gradle-wrapper.properties
+
+# Cache of project
+.gradletasknamecache
+
+# Eclipse Gradle plugin generated files
+# Eclipse Core
+.project
+# JDT-specific (Eclipse Java Development Tools)
+.classpath
+
+### Gradle Patch ###
+# Java heap dump
+*.hprof
+
+# End of https://www.toptal.com/developers/gitignore/api/gradle,java,intellij+all
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 0000000..2634e82
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,29 @@
+import org.gradle.internal.jvm.Jvm
+
+plugins {
+    id 'java-processor-plugin'
+}
+
+group 'ftbsc.lll.processor'
+version '1.0-SNAPSHOT'
+
+repositories {
+    mavenCentral()
+    maven { url = 'https://maven.fantabos.co' }
+}
+
+dependencies {
+    implementation files(Jvm.current().toolsJar)
+    implementation 'com.squareup:javapoet:1.13.0'
+    implementation 'ftbsc:lll:0.1.2'
+    implementation 'org.ow2.asm:asm-commons:9.4'
+}
+
+gradlePlugin {
+    plugins {
+        create("lillero-processor") {
+            id = "ftbsc.lll.processor"
+            implementationClass = "ftbsc.lll.processor.Plugin"
+        }
+    }
+}
\ No newline at end of file
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..41d9927
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.jar
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..41dfb87
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.4-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
new file mode 100644
index 0000000..fa0e2d7
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,234 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original 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 POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+APP_NAME="Gradle"
+APP_BASE_NAME=${0##*/}
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/processor/wrapper/processor-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$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" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.processor.wrapper.GradleWrapperMain \
+        "$@"
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000..107acd3
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,89 @@
+@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 execute
+
+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 execute
+
+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
+
+: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 %*
+
+: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
diff --git a/settings.gradle b/settings.gradle
new file mode 100644
index 0000000..6ee7ea3
--- /dev/null
+++ b/settings.gradle
@@ -0,0 +1,2 @@
+rootProject.name = 'lillero-processor'
+
diff --git a/src/main/java/ftbsc/lll/processor/LilleroProcessor.java b/src/main/java/ftbsc/lll/processor/LilleroProcessor.java
new file mode 100644
index 0000000..851987f
--- /dev/null
+++ b/src/main/java/ftbsc/lll/processor/LilleroProcessor.java
@@ -0,0 +1,180 @@
+package ftbsc.lll.processor;
+
+import com.squareup.javapoet.*;
+import ftbsc.lll.IInjector;
+import ftbsc.lll.processor.annotations.Injector;
+import ftbsc.lll.processor.annotations.Patch;
+import ftbsc.lll.tools.DescriptorBuilder;
+import org.objectweb.asm.tree.ClassNode;
+import org.objectweb.asm.tree.MethodNode;
+
+import javax.annotation.processing.*;
+import javax.lang.model.SourceVersion;
+import javax.lang.model.element.ExecutableElement;
+import javax.lang.model.element.Modifier;
+import javax.lang.model.element.TypeElement;
+import javax.lang.model.type.ExecutableType;
+import javax.lang.model.type.TypeMirror;
+import javax.lang.model.util.Elements;
+import javax.lang.model.util.Types;
+import javax.tools.Diagnostic;
+import javax.tools.JavaFileObject;
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.lang.annotation.Annotation;
+import java.lang.annotation.Target;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+@SupportedAnnotationTypes("ftbsc.lll.processor.annotations.Patch")
+@SupportedSourceVersion(SourceVersion.RELEASE_8)
+public class LilleroProcessor extends AbstractProcessor {
+
+	Types types = processingEnv.getTypeUtils();
+	Elements elements = processingEnv.getElementUtils();
+
+	@Override
+	public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
+		Set<TypeElement> validInjectors = new HashSet<>();
+		for (TypeElement annotation : annotations) {
+			if(isValidInjector(annotation))
+				validInjectors.add(annotation);
+			else processingEnv.getMessager().printMessage(
+				Diagnostic.Kind.WARNING,
+				"Missing valid inject() method on @Injector class " + annotation.getQualifiedName() + "."
+			);
+		}
+
+		if(validInjectors.isEmpty())
+			return false;
+
+		validInjectors.forEach(this::generateInjector);
+		generateServiceProvider(validInjectors);
+		return true;
+	}
+
+	/** TODO: fancy class object ref in javadoc
+	 * This checks whether a given class contains the requirements to be parsed into a Lillero injector.
+	 * It must have at least one method annotated with @Target, and one method annotated with @Injector
+	 * that must be public, static and take in a ClassNode and a MethodNode.
+	 * @param elem the element to check.
+	 * @return whether it can be converted into a valid IInjector.
+	 */
+	private boolean isValidInjector(TypeElement elem) {
+		TypeMirror classNodeType = processingEnv.getElementUtils().getTypeElement("org.objectweb.asm.tree.ClassNode").asType();
+		TypeMirror methodNodeType = processingEnv.getElementUtils().getTypeElement("org.objectweb.asm.tree.MethodNode").asType();
+		return elem.getEnclosedElements().stream().anyMatch(e -> e.getAnnotation(Target.class) != null)
+			&& elem.getEnclosedElements().stream().anyMatch(e -> {
+			List<? extends TypeMirror> params = ((ExecutableType) e.asType()).getParameterTypes();
+			return e.getAnnotation(Injector.class) != null
+				&& e.getModifiers().contains(Modifier.PUBLIC)
+				&& e.getModifiers().contains(Modifier.STATIC)
+				&& params.size() == 2
+				&& processingEnv.getTypeUtils().isSameType(params.get(0), classNodeType)
+				&& processingEnv.getTypeUtils().isSameType(params.get(1), methodNodeType);
+		});
+	}
+
+	private MethodSpec findAnnotatedMethod(TypeElement cl, Class<? extends Annotation> ann) {
+		return MethodSpec.overriding(
+			(ExecutableElement) cl.getEnclosedElements()
+				.stream()
+				.filter(e -> e.getAnnotation(ann) != null)
+				.findFirst()
+				.get() //will never be null so can ignore warning
+		).build();
+	}
+
+	private String getClassOrString(TypeName n) { //jank but fuck you
+		return n.isPrimitive() ? n + ".class" : "\"" + n + "\"";
+	}
+
+	private String generateDescriptorBuilderString(MethodSpec m) {
+		StringBuilder sb = new StringBuilder();
+		sb.append("new $T().setReturnType(");
+		sb.append(getClassOrString(m.returnType)).append(")");
+		m.parameters.forEach(p -> sb.append(".addParameter(").append(getClassOrString(p.type)).append(")"));
+		sb.append(".build();");
+		return sb.toString();
+	}
+
+	private String getSrgName(MethodSpec m) {
+		return m.name; //TODO;
+	}
+
+	private void generateInjector(TypeElement cl) {
+		Patch ann = cl.getAnnotation(Patch.class);
+		MethodSpec targetMethod = findAnnotatedMethod(cl, Target.class);
+		MethodSpec injectorMethod = findAnnotatedMethod(cl, Injector.class);
+
+		String packageName = cl.getQualifiedName().toString().replace("." + cl.getSimpleName().toString(), "");
+
+		String className = cl.getQualifiedName().toString();
+		String simpleClassName = cl.getSimpleName().toString();
+
+		String injectorClassName = className + "Injector";
+		String injectorSimpleClassName = simpleClassName + "Injector";
+
+		MethodSpec name = MethodSpec.methodBuilder("name")
+			.addModifiers(Modifier.PUBLIC)
+			.returns(String.class)
+			.addStatement("return $S", simpleClassName)
+			.build();
+
+		MethodSpec reason = MethodSpec.methodBuilder("reason")
+			.addModifiers(Modifier.PUBLIC)
+			.returns(String.class)
+			.addStatement("return $S", ann.reason())
+			.build();
+
+		MethodSpec targetClass = MethodSpec.methodBuilder("targetClass")
+			.addModifiers(Modifier.PUBLIC)
+			.returns(String.class)
+			.addStatement("return $S", ann.value().getName())
+			.build();
+
+		MethodSpec methodName = MethodSpec.methodBuilder("methodName")
+			.addModifiers(Modifier.PUBLIC)
+			.returns(String.class)
+			.addStatement("return $S", getSrgName(targetMethod))
+			.build();
+
+		MethodSpec methodDesc = MethodSpec.methodBuilder("methodDesc")
+			.addModifiers(Modifier.PUBLIC)
+			.returns(String.class)
+			.addCode(generateDescriptorBuilderString(targetMethod), DescriptorBuilder.class)
+			.build();
+
+		MethodSpec inject = MethodSpec.methodBuilder("inject")
+			.addModifiers(Modifier.PUBLIC)
+			.returns(void.class)
+			.addParameter(ParameterSpec.builder(ClassNode.class, "clazz").build())
+			.addParameter(ParameterSpec.builder(MethodNode.class, "main").build())
+			.addStatement("$S.$S(clazz, main)", className, injectorMethod.name)
+			.build();
+
+		TypeSpec injectorClass = TypeSpec.classBuilder(injectorSimpleClassName)
+			.addModifiers(Modifier.PUBLIC)
+			.addSuperinterface(ClassName.get(IInjector.class))
+			.addMethod(name)
+			.addMethod(reason)
+			.addMethod(targetClass)
+			.addMethod(methodName)
+			.addMethod(methodDesc)
+			.addMethod(inject)
+			.build();
+
+		try {
+			JavaFileObject builderFile = processingEnv.getFiler().createSourceFile(injectorClassName);
+			PrintWriter out = new PrintWriter(builderFile.openWriter());
+
+			JavaFile javaFile = JavaFile.builder(packageName, injectorClass).build();
+			javaFile.writeTo(out);
+		} catch(IOException e) {}
+	}
+
+	private void generateServiceProvider(Set<TypeElement> inj) {
+		//todo generate the services file
+	}
+}
\ No newline at end of file
diff --git a/src/main/java/ftbsc/lll/processor/Main.java b/src/main/java/ftbsc/lll/processor/Main.java
new file mode 100644
index 0000000..54de47b
--- /dev/null
+++ b/src/main/java/ftbsc/lll/processor/Main.java
@@ -0,0 +1,11 @@
+package ftbsc.lll.processor;
+
+import org.gradle.api.Plugin;
+import org.gradle.api.Project;
+
+public class Main implements Plugin<Project> {
+	@Override
+	public void apply(Project project) {
+
+	}
+}
diff --git a/src/main/java/ftbsc/lll/processor/annotations/Injector.java b/src/main/java/ftbsc/lll/processor/annotations/Injector.java
new file mode 100644
index 0000000..6184610
--- /dev/null
+++ b/src/main/java/ftbsc/lll/processor/annotations/Injector.java
@@ -0,0 +1,10 @@
+package ftbsc.lll.processor.annotations;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.SOURCE)
+@Target(ElementType.METHOD)
+public @interface Injector {}
diff --git a/src/main/java/ftbsc/lll/processor/annotations/Patch.java b/src/main/java/ftbsc/lll/processor/annotations/Patch.java
new file mode 100644
index 0000000..adbb674
--- /dev/null
+++ b/src/main/java/ftbsc/lll/processor/annotations/Patch.java
@@ -0,0 +1,13 @@
+package ftbsc.lll.processor.annotations;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.SOURCE)
+@Target(ElementType.TYPE)
+public @interface Patch {
+	Class<?> value();
+	String reason() default "No reason specified.";
+}
diff --git a/src/main/java/ftbsc/lll/processor/annotations/Target.java b/src/main/java/ftbsc/lll/processor/annotations/Target.java
new file mode 100644
index 0000000..e408755
--- /dev/null
+++ b/src/main/java/ftbsc/lll/processor/annotations/Target.java
@@ -0,0 +1,9 @@
+package ftbsc.lll.processor.annotations;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
+@Retention(RetentionPolicy.SOURCE)
+@java.lang.annotation.Target(ElementType.METHOD)
+public @interface Target {}
diff --git a/src/main/resources/META-INF/services/javax.annotation.processing.Processor b/src/main/resources/META-INF/services/javax.annotation.processing.Processor
new file mode 100644
index 0000000..508214e
--- /dev/null
+++ b/src/main/resources/META-INF/services/javax.annotation.processing.Processor
@@ -0,0 +1 @@
+ftbsc.lll.processor.LilleroProcessor
\ No newline at end of file