Initial commit

14 files changed, 553 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b740e72
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+# Project exclude paths
+/.gradle/
+/build/
\ No newline at end of file
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..320bdb7
--- /dev/null
+++ b/README.md
@@ -0,0 +1,2 @@
+#EVENTBUS-KOTLIN
+ this isnt done yet i just wanted to get the gh up
diff --git a/build.gradle.kts b/build.gradle.kts
new file mode 100644
index 0000000..b882228
--- /dev/null
+++ b/build.gradle.kts
@@ -0,0 +1,31 @@
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
+plugins {
+    kotlin("jvm") version "1.6.10"
+}
+
+group = "me.bush"
+version = "1.0.0"
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation(kotlin("test"))
+
+    // Staying on the version used by 1.12.2 to avoid possible incompatibilities.
+    // 2.15.0 is not vulnerable to any RCE exploits.
+    implementation("org.apache.logging.log4j:log4j-api:2.15.0")
+    implementation("org.apache.logging.log4j:log4j-core:2.15.0")
+
+    implementation("org.jetbrains.kotlin:kotlin-reflect:1.6.10")
+}
+
+tasks.test {
+    useJUnitPlatform()
+}
+
+tasks.withType<KotlinCompile> {
+    kotlinOptions.jvmTarget = "1.8"
+}
\ No newline at end of file
diff --git a/gradle.properties b/gradle.properties
new file mode 100644
index 0000000..7fc6f1f
--- /dev/null
+++ b/gradle.properties
@@ -0,0 +1 @@
+kotlin.code.style=official
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..7454180
--- /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..69a9715
--- /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-7.1-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
new file mode 100644
index 0000000..744e882
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,185 @@
+#!/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 "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MSYS* | MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$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 "$JAVACMD" "$@"
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.kts b/settings.gradle.kts
new file mode 100644
index 0000000..49d1d6a
--- /dev/null
+++ b/settings.gradle.kts
@@ -0,0 +1,3 @@
+
+rootProject.name = "illnamethislater"
+
diff --git a/src/main/kotlin/me/bush/illnamethislater/Event.kt b/src/main/kotlin/me/bush/illnamethislater/Event.kt
new file mode 100644
index 0000000..2430067
--- /dev/null
+++ b/src/main/kotlin/me/bush/illnamethislater/Event.kt
@@ -0,0 +1,18 @@
+package me.bush.illnamethislater
+
+/**
+ * A base class for events that can be cancelled.
+ *
+ * @author bush
+ * @since 3/13/2022
+ */
+abstract class Event {
+    var cancelled = false
+        set(value) {
+            if (cancellable) field = value
+        }
+
+    abstract val cancellable: Boolean
+
+    fun cancel() { cancelled = false }
+}
\ No newline at end of file
diff --git a/src/main/kotlin/me/bush/illnamethislater/EventBus.kt b/src/main/kotlin/me/bush/illnamethislater/EventBus.kt
new file mode 100644
index 0000000..f35b65d
--- /dev/null
+++ b/src/main/kotlin/me/bush/illnamethislater/EventBus.kt
@@ -0,0 +1,82 @@
+package me.bush.illnamethislater
+
+import org.apache.logging.log4j.LogManager
+import org.apache.logging.log4j.Logger
+import java.util.UUID
+import java.util.concurrent.atomic.AtomicLong
+import kotlin.reflect.KClass
+import kotlin.reflect.full.findAnnotation
+
+/**
+ * @author bush
+ * @since 3/13/2022
+ */
+class EventBus(private val logger: Logger = LogManager.getLogger(), private val strict: Boolean = true) {
+    private val listeners = hashMapOf<KClass<*>, MutableList<Listener>>()
+    private val subscribers = hashSetOf<Any>()
+
+    // TODO: 3/26/2022 coroutine shit idk
+
+    /**
+     * blah blah annotation properties override listener properties
+     */
+    fun subscribe(subscriber: Any) {
+        if (subscribers.add(subscriber)) {
+            subscriber::class.allMembers.filterReturnType<Listener>().forEach { property ->
+                register(property.handleCall(subscriber).apply {
+                    // If the annotation is present, update listener settings from it
+                    // If it is not, and we are in strict mode, continue to the next property
+                    property.findAnnotation<EventListener>()?.let {
+                        priority = it.priority
+                        receiveCancelled = it.receiveCancelled
+                    } ?: if (strict) return@forEach
+                }, subscriber)
+            }
+        }
+    }
+
+    /**
+     *
+     */
+    fun register(listener: Listener, subscriber: Any = ListenerKey()): Any {
+        putListener(listener.also { it.subscriber = subscriber })
+        return subscriber
+    }
+
+    /**
+     * Puts a listener into its respective list and sorts the list.
+     */
+    private fun putListener(listener: Listener) {
+        listeners.getOrPut(listener.type) { mutableListOf() }.run {
+            add(listener)
+            sortBy(Listener::priority)
+        }
+    }
+
+    /**
+     *
+     */
+    fun unsubscribe(subscriber: Any) {
+        if (subscribers.remove(subscriber)) {
+            listeners.values.forEach { it.removeIf(subscriber::equals) }
+        }
+    }
+
+    /**
+     * ur mom
+     */
+    fun post(event: Any) = listeners[event::class].let { list ->
+        if (list == null || list.isEmpty()) false
+        else if (event is Event) {
+            list.forEach {
+                if (!event.cancelled || it.receiveCancelled) {
+                    it.listener(event)
+                }
+            }
+            event.cancelled
+        } else {
+            list.forEach { it.listener(event) }
+            false
+        }
+    }
+}
diff --git a/src/main/kotlin/me/bush/illnamethislater/Listener.kt b/src/main/kotlin/me/bush/illnamethislater/Listener.kt
new file mode 100644
index 0000000..f4626ca
--- /dev/null
+++ b/src/main/kotlin/me/bush/illnamethislater/Listener.kt
@@ -0,0 +1,51 @@
+package me.bush.illnamethislater
+
+import kotlin.reflect.KClass
+
+// document
+annotation class EventListener(val priority: Int = 0, val receiveCancelled: Boolean = false)
+
+/**
+ * This class is not intended to be used externally, it is just
+ * a wrapper for a listener function and some related properties.
+ *
+ * Use [listener] instead.
+ *
+ * @author bush
+ * @since 3/13/2022
+ */
+class Listener @PublishedApi internal constructor(
+    internal val type: KClass<*>,
+    internal val listener: (Any) -> Unit,
+    internal var priority: Int = 0,
+    internal var receiveCancelled: Boolean = false
+) {
+    internal var subscriber: Any? = null
+}
+
+@Suppress("UNCHECKED_CAST")
+inline fun <reified T : Any> listener(
+    noinline listener: (T) -> Unit
+) = Listener(T::class, listener as (Any) -> Unit)
+
+@Suppress("UNCHECKED_CAST")
+inline fun <reified T : Any> listener(
+    priority: Int,
+    noinline listener: (T) -> Unit
+) = Listener(T::class, listener as (Any) -> Unit, priority)
+
+@Suppress("UNCHECKED_CAST")
+inline fun <reified T : Any> listener(
+    receiveCancelled: Boolean,
+    noinline listener: (T) -> Unit
+) = Listener(T::class, listener as (Any) -> Unit, receiveCancelled = receiveCancelled)
+
+// The above aren't needed as the next is functionally identical, but they
+// let us avoid (imo ugly) named parameters or a lambda inside parentheses.
+
+@Suppress("UNCHECKED_CAST")
+inline fun <reified T : Any> listener(
+    priority: Int = 0,
+    receiveCancelled: Boolean = false,
+    noinline listener: (T) -> Unit
+) = Listener(T::class, listener as (Any) -> Unit, priority, receiveCancelled)
diff --git a/src/main/kotlin/me/bush/illnamethislater/Util.kt b/src/main/kotlin/me/bush/illnamethislater/Util.kt
new file mode 100644
index 0000000..6c0eb9a
--- /dev/null
+++ b/src/main/kotlin/me/bush/illnamethislater/Util.kt
@@ -0,0 +1,57 @@
+package me.bush.illnamethislater
+
+import java.lang.reflect.Modifier
+import java.util.concurrent.atomic.AtomicInteger
+import java.util.concurrent.atomic.AtomicLong
+import kotlin.reflect.KCallable
+import kotlin.reflect.KClass
+import kotlin.reflect.KProperty
+import kotlin.reflect.full.allSuperclasses
+import kotlin.reflect.full.declaredMembers
+import kotlin.reflect.full.starProjectedType
+import kotlin.reflect.jvm.javaField
+import kotlin.reflect.jvm.javaGetter
+
+// @author bush
+// @since 3/13/2022
+
+/**
+ * Using [KClass.members] only returns public members, and
+ * using [KClass.declaredMembers] doesn't return inherited
+ * members. This returns all members, private and inherited.
+ */
+internal val <T : Any> KClass<T>.allMembers
+    get() = declaredMembers + allSuperclasses.flatMap { it.declaredMembers }
+
+/**
+ * Checks if a [KCallable] is static on the jvm, and handles invocation accordingly.
+ *
+ * I am not aware of a better alternative that works with `object` classes.
+ */
+internal fun <R> KCallable<R>.handleCall(receiver: Any) = if (static) call() else call(receiver)
+
+/**
+ * Checks if the calling [KCallable] is a static java field.
+ *
+ * Because kotlin likes to be funny, properties belonging to
+ * `object` classes are static, but their getters are not.
+ *
+ * If there is a getter (the property is not private),
+ * we will be accessing it through that, so we can stop checking.
+ *
+ * Otherwise, we check if the field is static with java reflection.
+ */
+internal val KCallable<*>.static
+    get() = if (this !is KProperty<*> || javaGetter != null) false
+    else javaField?.let { Modifier.isStatic(it.modifiers) } ?: false
+
+@Suppress("UNCHECKED_CAST") // This cannot fail
+internal inline fun <reified T : Any> List<KCallable<*>>.filterReturnType() =
+    filter { it.returnType == T::class.starProjectedType } as List<KCallable<T>>
+
+/**
+ * A simple class returned as a "key" for listeners that are not
+ * members of a class, just to make its intentions clearer. This
+ * can be used in [EventBus.unsubscribe] to remove the listener.
+ */
+internal class ListenerKey
\ No newline at end of file
diff --git a/src/test/kotlin/Main.kt b/src/test/kotlin/Main.kt
new file mode 100644
index 0000000..0933c97
--- /dev/null
+++ b/src/test/kotlin/Main.kt
@@ -0,0 +1,26 @@
+import me.bush.illnamethislater.*
+
+/**
+ * @author bush
+ * @since 3/13/2022
+ */
+fun main() {
+    EventBus().run {
+
+        subscribe(Subscriber())
+
+        post("Object()")
+
+        register(listener<String> {
+            println("it")
+        })
+    }
+}
+
+class Subscriber {
+// clean up and writr tests
+    @EventListener
+    fun onDeez() = listener(listener =  { e: String ->
+        println(e.uppercase())
+    }, receiveCancelled = false, )
+}