Common code initial

v. 1.0.8-SNAPSHOT
v. 1.0.7 upgrade to Kotlin 1.7.20
2022-10-14 16:56:21 +02:00 · 2022-10-14 16:55:49 +02:00 · 2022-10-14 16:51:06 +02:00 · 2022-08-10 20:53:06 +02:00 · 2022-03-03 14:28:13 +01:00 · 2022-02-25 19:21:40 +01:00
25 changed files with 1344 additions and 1471 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,11 @@
 # Created by .ignore support plugin (hsz.mobi)
+build
+.gradle
 web/js/generated
 gradle.properties
 local.properties
+*.iml
+*.ipr
+*.iws
+kotlin-js-store
+.idea
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,27 +1,23 @@
-
 plugins {
-    kotlin("multiplatform") version "1.4.32"
+  kotlin("multiplatform") version "1.7.20"
  `maven-publish`
+  signing
+  id("org.jetbrains.dokka") version "1.5.31"
 }

 group = "nl.astraeus"
-version = "0.3.0-SNAPSHOT"
+version = "1.0.8-SNAPSHOT"

 repositories {
  mavenCentral()
-    jcenter()
 }

 kotlin {
-    /* Targets configuration omitted. 
-    *  To find out how to configure the targets, please follow the link:
-    *  https://kotlinlang.org/docs/reference/building-mpp-with-gradle.html#setting-up-targets */
  js(BOTH) {
    browser {
-            //produceKotlinLibrary()
      testTask {
        useKarma {
-                    useChromeHeadless()
+          useChromiumHeadless()
        }
      }
    }
@@ -32,7 +28,7 @@ kotlin {
      dependencies {
        implementation(kotlin("stdlib-common"))

-                api("org.jetbrains.kotlinx:kotlinx-html-js:0.7.2")
+        api("org.jetbrains.kotlinx:kotlinx-html-js:0.7.3")
      }
    }
    val jsMain by getting {
@@ -48,15 +44,37 @@ kotlin {
  }
 }

+extra["PUBLISH_GROUP_ID"] = group
+extra["PUBLISH_VERSION"] = version
+extra["PUBLISH_ARTIFACT_ID"] = name
+
+// Stub secrets to let the project sync and build without the publication values set up
+val signingKeyId: String? by project
+val signingPassword: String? by project
+val signingSecretKeyRingFile: String? by project
+val ossrhUsername: String? by project
+val ossrhPassword: String? by project
+
+extra["signing.keyId"] = signingKeyId
+extra["signing.password"] = signingPassword
+extra["signing.secretKeyRingFile"] = signingSecretKeyRingFile
+extra["ossrhUsername"] = ossrhUsername
+extra["ossrhPassword"] = ossrhPassword
+
+val javadocJar by tasks.registering(Jar::class) {
+  archiveClassifier.set("javadoc")
+}
+
 publishing {
  repositories {
-        if (project.properties["nexusUsername"] != null) {
+    mavenLocal()
    maven {
      name = "releases"
-                url = uri("http://nexus.astraeus.nl/nexus/content/repositories/releases")
+      // change to point to your repo, e.g. http://my.org/repo
+      setUrl("https://nexus.astraeus.nl/nexus/content/repositories/releases")
      credentials {
-                    val nexusUsername: String by project
-                    val nexusPassword: String by project
+        val nexusUsername: String? by project
+        val nexusPassword: String? by project

        username = nexusUsername
        password = nexusPassword
@@ -64,20 +82,57 @@ publishing {
    }
    maven {
      name = "snapshots"
-                url = uri("http://nexus.astraeus.nl/nexus/content/repositories/snapshots")
+      // change to point to your repo, e.g. http://my.org/repo
+      setUrl("https://nexus.astraeus.nl/nexus/content/repositories/snapshots")
      credentials {
-                    val nexusUsername: String by project
-                    val nexusPassword: String by project
+        val nexusUsername: String? by project
+        val nexusPassword: String? by project

        username = nexusUsername
        password = nexusPassword
      }
    }
-        } else {
-            println("Publishing disabled properties not found.")
+    maven {
+      name = "sonatype"
+      setUrl("https://s01.oss.sonatype.org/service/local/staging/deploy/maven2")
+      credentials {
+        username = ossrhUsername
+        password = ossrhPassword
+      }
+    }
+  }
+
+  // Configure all publications
+  publications.withType<MavenPublication> {
+    // Stub javadoc.jar artifact
+    artifact(javadocJar.get())
+
+    // Provide artifacts information requited by Maven Central
+    pom {
+      name.set("kotlin-komponent")
+      description.set("Kotlin komponent")
+      url.set("https://github.com/rnentjes/komponent")
+
+      licenses {
+        license {
+          name.set("MIT")
+          url.set("https://opensource.org/licenses/MIT")
+        }
+      }
+      developers {
+        developer {
+          id.set("rnentjes")
+          name.set("Rien Nentjes")
+          email.set("info@nentjes.com")
+        }
+      }
+      scm {
+        url.set("https://github.com/rnentjes/komponent")
      }
    }
-    publications {
-        val kotlinMultiplatform by getting {}
  }
 }
+
+signing {
+  sign(publishing.publications)
+}
--- a/docs/getting-started.md
+++ b/docs/getting-started.md
@@ -0,0 +1,147 @@
+# Table of contents
+
+* [Home](home.md)
+* [Getting started](getting-started.md)
+* [How it works](how-it-works.md)
+
+# Getting started
+
+To get started create a new kotlin project in intellij of the type 'Browser application'
+
+![Create 'Browser Application' project](/docs/img/create-project.png)
+
+Add the 'sourceSets' block with the kotlin-komponent dependency so your build.gradle.kts looks like this:
+
+```gradle
+plugins {
+    kotlin("js") version "1.6.10"
+}
+
+group = "com.test"
+version = "1.0.0-SNAPSHOT"
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    api("nl.astraeus:kotlin-komponent-js:1.0.0")
+
+    testImplementation(kotlin("test"))
+}
+
+kotlin {
+    js(IR) {
+        binaries.executable()
+        browser {
+            commonWebpackConfig {
+                cssSupport.enabled = true
+            }
+        }
+    }
+}
+```
+
+Refresh the gradle project to import the dependency.
+
+There is now only one kotlin source file in the project called Simple.kt, it should look something like this:
+
+```kotin
+fun main() {
+  console.log("Hello, ${greet()}")
+}
+
+fun greet() = "world"
+```
+
+Replace the code in the file with the following for a simple click app:
+
+```koltin
+import kotlinx.browser.document
+import kotlinx.html.button
+import kotlinx.html.div
+import kotlinx.html.hr
+import kotlinx.html.js.onClickFunction
+import nl.astraeus.komp.HtmlBuilder
+import nl.astraeus.komp.Komponent
+import nl.astraeus.komp.mutableCollectionState
+import nl.astraeus.komp.state
+import kotlin.js.Date
+
+fun main() {
+  console.log("Hello, ${greet()}")
+
+  Komponent.create(document.body!!, TestKomponent())
+}
+
+fun greet() = "world"
+
+class TestKomponent : Komponent() {
+  var clicks: Int = 0
+  val lines: MutableCollection<String> = mutableListOf()
+
+  override fun HtmlBuilder.render() {
+    div {
+      div {
+        +"Hello Komponent!"
+      }
+
+      div {
+        +"Clicks $clicks"
+      }
+
+      div {
+        button {
+          +"Click"
+          onClickFunction = {
+            clicks++
+            lines.add("click $clicks at ${Date()}")
+            requestUpdate()
+          }
+        }
+      }
+
+      hr()
+
+      for (line in lines) {
+        div {
+          + line
+        }
+      }
+
+    }
+  }
+}
+```
+
+First in the main we add our TestKomponent to the document body with the following line:
+
+```kotlin
+  Komponent.create(document.body!!, TestKomponent())
+```
+
+The TestKomponent.render method will be called to render our Komponent. 
+As you can see events can be attached inline with the on<event>Function methods.
+The requestUpdate method will call the render method again and update the page accordingly.
+
+After building the application you will find it in /build/distributions.
+
+In the index.html page you will find the following line:
+
+```html
+<div id="root"></div>
+```
+
+This line is not needed for kotlin-komponent.
+
+If you like you can use some helpers that will automatically call the requestUpdate method if
+the data changes, that would look like this:
+
+```kotlin
+  var clicks: Int by state(0)
+  val lines: MutableCollection<String> = mutableCollectionState(mutableListOf())
+```
+
+In that case you can remove the requestUpdate call from the onClickFunction.
+
+You can find a working repository of this example here: [example]()
--- a/docs/home.md
+++ b/docs/home.md
@@ -0,0 +1,5 @@
+# Table of contents
+
+* [Home](home.md)
+* [Getting started](getting-started.md)
+* [How it works](how-it-works.md)
--- a/docs/how-it-works.md
+++ b/docs/how-it-works.md
@@ -0,0 +1,23 @@
+# Table of contents
+
+* [Home](home.md)
+* [Getting started](getting-started.md)
+* [How it works](how-it-works.md)
+
+# How it works
+
+When the requestUpdate call is made to the [Komponent](src/jsMain/kotlin/nl/astraeus/komp/Komponent.kt)
+the update is queued in a callback. The callback will be called after the current event is handled.
+
+If there are multiple updates requested, these are sorted so that the top Komponents get executed first. 
+This way there will not be double updates of the same komponent.
+
+The render call will be invoked and every html builder function (div, span etc.) will call the 
+different HtmlBuilder functions like onTagStart, onTagAttributeChange etc.
+
+In these functions the HtmlBuilder will compare the dom against the call being made and it will update the DOM
+if needed.
+
+
+
+
--- a/docs/img/create
+++ b/docs/img/create
--- a/docs/img/new-project-simple.png
+++ b/docs/img/new-project-simple.png
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 #Wed Mar 04 13:29:12 CET 2020
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.2-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.5.1-all.zip
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStorePath=wrapper/dists
--- a/komp.commonMain.iml
+++ b/komp.commonMain.iml
@@ -1,38 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<module external.linked.project.id="komp:commonMain" external.linked.project.path="$MODULE_DIR$" external.root.project.path="$MODULE_DIR$" external.system.id="GRADLE" external.system.module.group="nl.astraeus" external.system.module.type="sourceSet" external.system.module.version="0.3.0-SNAPSHOT" type="JAVA_MODULE" version="4">
-  <component name="FacetManager">
-    <facet type="kotlin-language" name="Kotlin">
-      <configuration version="3" platform="Common (experimental) " allPlatforms="JS []/JVM [1.8]/Native []/Native [general]" useProjectSettings="false" isTestModule="false" externalProjectId="komp" pureKotlinSourceFolders="$MODULE_DIR$/src/jsMain/kotlin;/home/rnentjes/Development/komp/komp/build/externals/komp-jsLegacy/src;/home/rnentjes/Development/komp/komp/build/externals/komp-jsIr/src;/home/rnentjes/Development/komp/komp/src/jsTest/kotlin">
-        <newMppModelJpsModuleKind>SOURCE_SET_HOLDER</newMppModelJpsModuleKind>
-        <compilerSettings />
-        <compilerArguments>
-          <option name="languageVersion" value="1.4" />
-          <option name="apiVersion" value="1.4" />
-          <option name="pluginOptions">
-            <array />
-          </option>
-          <option name="pluginClasspaths">
-            <array>
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-scripting-jvm/1.4.32/49656d531bfab9d6e45d3f27bc4d03b542d6766/kotlin-scripting-jvm-1.4.32.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-scripting-common/1.4.32/6abda0fe69677f0e46e7539fd185e4bd093b7258/kotlin-scripting-common-1.4.32.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlinx/kotlinx-coroutines-core/1.3.8/f62be6d4cbf27781c2969867b4ed952f38378492/kotlinx-coroutines-core-1.3.8.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib/1.4.32/461367948840adbb0839c51d91ed74ef4a9ccb52/kotlin-stdlib-1.4.32.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-common/1.4.32/ef50bfa2c0491a11dcc35d9822edbfd6170e1ea2/kotlin-stdlib-common-1.4.32.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains/annotations/13.0/919f0dfe192fb4e063e7dacadee7f8bb9a2672a9/annotations-13.0.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-script-runtime/1.4.32/bac50b0748be017dbc13fc1cb7231b1c9da0e106/kotlin-script-runtime-1.4.32.jar" />
-            </array>
-          </option>
-          <option name="multiPlatform" value="true" />
-        </compilerArguments>
-      </configuration>
-    </facet>
-  </component>
-  <component name="NewModuleRootManager" inherit-compiler-output="true">
-    <exclude-output />
-    <content url="file://$MODULE_DIR$/src/commonMain" />
-    <orderEntry type="jdk" jdkName="Kotlin SDK" jdkType="KotlinSDK" />
-    <orderEntry type="sourceFolder" forTests="false" />
-    <orderEntry type="library" name="Gradle: org.jetbrains.kotlin:kotlin-stdlib-common:1.4.32" level="project" />
-    <orderEntry type="library" name="Gradle: org.jetbrains.kotlinx:kotlinx-html-common:0.7.2" level="project" />
-  </component>
-</module>
--- a/komp.commonTest.iml
+++ b/komp.commonTest.iml
@@ -1,44 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<module external.linked.project.id="komp:commonTest" external.linked.project.path="$MODULE_DIR$" external.root.project.path="$MODULE_DIR$" external.system.id="GRADLE" external.system.module.group="nl.astraeus" external.system.module.type="sourceSet" external.system.module.version="0.3.0-SNAPSHOT" type="JAVA_MODULE" version="4">
-  <component name="FacetManager">
-    <facet type="kotlin-language" name="Kotlin">
-      <configuration version="3" platform="Common (experimental) " allPlatforms="JS []/JVM [1.8]/Native []/Native [general]" useProjectSettings="false" isTestModule="true" externalProjectId="komp" pureKotlinSourceFolders="$MODULE_DIR$/src/jsMain/kotlin;/home/rnentjes/Development/komp/komp/build/externals/komp-jsLegacy/src;/home/rnentjes/Development/komp/komp/build/externals/komp-jsIr/src;/home/rnentjes/Development/komp/komp/src/jsTest/kotlin">
-        <newMppModelJpsModuleKind>SOURCE_SET_HOLDER</newMppModelJpsModuleKind>
-        <externalSystemTestTasks>
-          <externalSystemTestTask>jsLegacyBrowserTest|komp:jsTest|jsLegacy</externalSystemTestTask>
-        </externalSystemTestTasks>
-        <compilerSettings />
-        <compilerArguments>
-          <option name="languageVersion" value="1.4" />
-          <option name="apiVersion" value="1.4" />
-          <option name="pluginOptions">
-            <array />
-          </option>
-          <option name="pluginClasspaths">
-            <array>
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-scripting-jvm/1.4.32/49656d531bfab9d6e45d3f27bc4d03b542d6766/kotlin-scripting-jvm-1.4.32.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-scripting-common/1.4.32/6abda0fe69677f0e46e7539fd185e4bd093b7258/kotlin-scripting-common-1.4.32.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlinx/kotlinx-coroutines-core/1.3.8/f62be6d4cbf27781c2969867b4ed952f38378492/kotlinx-coroutines-core-1.3.8.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib/1.4.32/461367948840adbb0839c51d91ed74ef4a9ccb52/kotlin-stdlib-1.4.32.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-common/1.4.32/ef50bfa2c0491a11dcc35d9822edbfd6170e1ea2/kotlin-stdlib-common-1.4.32.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains/annotations/13.0/919f0dfe192fb4e063e7dacadee7f8bb9a2672a9/annotations-13.0.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-script-runtime/1.4.32/bac50b0748be017dbc13fc1cb7231b1c9da0e106/kotlin-script-runtime-1.4.32.jar" />
-            </array>
-          </option>
-          <option name="multiPlatform" value="true" />
-        </compilerArguments>
-      </configuration>
-    </facet>
-  </component>
-  <component name="NewModuleRootManager" inherit-compiler-output="true">
-    <exclude-output />
-    <content url="file://$MODULE_DIR$/src/commonTest" />
-    <orderEntry type="jdk" jdkName="Kotlin SDK" jdkType="KotlinSDK" />
-    <orderEntry type="sourceFolder" forTests="false" />
-    <orderEntry type="module" module-name="komp.commonMain" scope="TEST" />
-    <orderEntry type="library" scope="TEST" name="Gradle: org.jetbrains.kotlin:kotlin-stdlib-js:1.4.32" level="project" />
-    <orderEntry type="library" scope="TEST" name="Gradle: org.jetbrains.kotlinx:kotlinx-html-common:0.7.2" level="project" />
-    <orderEntry type="library" scope="TEST" name="Gradle: org.jetbrains.kotlin:kotlin-stdlib-common:1.4.32" level="project" />
-  </component>
-  <component name="TestModuleProperties" production-module="komp.commonMain" />
-</module>
--- a/komp.iml
+++ b/komp.iml
@@ -1,12 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<module external.linked.project.id="komp" external.linked.project.path="$MODULE_DIR$" external.root.project.path="$MODULE_DIR$" external.system.id="GRADLE" external.system.module.group="nl.astraeus" external.system.module.version="0.3.0-SNAPSHOT" type="JAVA_MODULE" version="4">
-  <component name="NewModuleRootManager" inherit-compiler-output="true">
-    <exclude-output />
-    <content url="file://$MODULE_DIR$">
-      <excludeFolder url="file://$MODULE_DIR$/.gradle" />
-      <excludeFolder url="file://$MODULE_DIR$/build" />
-    </content>
-    <orderEntry type="inheritedJdk" />
-    <orderEntry type="sourceFolder" forTests="false" />
-  </component>
-</module>
--- a/komp.ipr
+++ b/komp.ipr
@@ -1,518 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="ArtifactManager">
-    <artifact type="jar" name="komp-0.1.16-SNAPSHOT">
-      <output-path>$PROJECT_DIR$/build/libs</output-path>
-      <root id="archive" name="komp-0.1.16-SNAPSHOT.jar">
-        <element id="module-output" name="komp_main" />
-      </root>
-    </artifact>
-    <artifact type="jar" name="komp-0.1.17-SNAPSHOT">
-      <output-path>$PROJECT_DIR$/build/libs</output-path>
-      <root id="archive" name="komp-0.1.17-SNAPSHOT.jar">
-        <element id="module-output" name="komp_main" />
-      </root>
-    </artifact>
-    <artifact type="jar" name="komp-js-0.1.21-SNAPSHOT">
-      <output-path>$PROJECT_DIR$/build/libs</output-path>
-      <root id="archive" name="komp-js-0.1.21-SNAPSHOT.jar">
-        <element id="module-output" name="komp.jsMain" />
-      </root>
-    </artifact>
-    <artifact type="jar" name="komp-js-0.2.1-SNAPSHOT">
-      <output-path>$PROJECT_DIR$/build/libs</output-path>
-      <root id="archive" name="komp-js-0.2.1-SNAPSHOT.jar">
-        <element id="module-output" name="komp.jsMain" />
-      </root>
-    </artifact>
-    <artifact type="jar" name="komp-js-0.2.2-SNAPSHOT">
-      <output-path>$PROJECT_DIR$/build/libs</output-path>
-      <root id="archive" name="komp-js-0.2.2-SNAPSHOT.jar">
-        <element id="module-output" name="komp.jsMain" />
-      </root>
-    </artifact>
-    <artifact type="jar" name="komp-jslegacy-0.2.2-SNAPSHOT">
-      <output-path>$PROJECT_DIR$/build/libs</output-path>
-      <root id="archive" name="komp-jslegacy-0.2.2-SNAPSHOT.jar">
-        <element id="module-output" name="komp.jsMain" />
-      </root>
-    </artifact>
-    <artifact type="jar" name="komp-jslegacy-0.2.3-SNAPSHOT">
-      <output-path>$PROJECT_DIR$/build/libs</output-path>
-      <root id="archive" name="komp-jslegacy-0.2.3-SNAPSHOT.jar">
-        <element id="module-output" name="komp.jsMain" />
-      </root>
-    </artifact>
-    <artifact type="jar" name="komp-jslegacy-0.2.4-SNAPSHOT">
-      <output-path>$PROJECT_DIR$/build/libs</output-path>
-      <root id="archive" name="komp-jslegacy-0.2.4-SNAPSHOT.jar">
-        <element id="module-output" name="komp.jsMain" />
-      </root>
-    </artifact>
-    <artifact type="jar" name="komp-jslegacy-0.2.5-SNAPSHOT">
-      <output-path>$PROJECT_DIR$/build/libs</output-path>
-      <root id="archive" name="komp-jslegacy-0.2.5-SNAPSHOT.jar">
-        <element id="module-output" name="komp.jsMain" />
-      </root>
-    </artifact>
-    <artifact type="jar" name="komp-jslegacy-0.3.0-SNAPSHOT">
-      <output-path>$PROJECT_DIR$/build/libs</output-path>
-      <root id="archive" name="komp-jslegacy-0.3.0-SNAPSHOT.jar">
-        <element id="module-output" name="komp.jsMain" />
-      </root>
-    </artifact>
-  </component>
-  <component name="CheckStyle-IDEA">
-    <option name="configuration">
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-        <root url="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-test-common/1.4.32/a10168dd408319a4af03763ad11f12e0fc1fc5ba/kotlin-test-common-1.4.32.jar!/" />
-      </CLASSES>
-      <JAVADOC />
-      <SOURCES>
-        <root url="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-test-common/1.4.32/d1818d1bdc457b51289f006884a260b56a55cb77/kotlin-test-common-1.4.32-sources.jar!/" />
-      </SOURCES>
-    </library>
-    <library name="Gradle: org.jetbrains.kotlin:kotlin-test-js:1.4.32" type="kotlin.js">
-      <CLASSES>
-        <root url="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-test-js/1.4.32/f4b4bf663acffeff2a664677b9e780f206f6842f/kotlin-test-js-1.4.32.jar!/" />
-      </CLASSES>
-      <JAVADOC />
-      <SOURCES>
-        <root url="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-test-js/1.4.32/8e70170db077d3f421c3fb6d24468b3938990f4a/kotlin-test-js-1.4.32-sources.jar!/" />
-      </SOURCES>
-    </library>
-    <library name="Gradle: org.jetbrains.kotlinx:kotlinx-html-common:0.7.2" type="kotlin.common">
-      <CLASSES>
-        <root url="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlinx/kotlinx-html-common/0.7.2/7da838083337896b558cab2884c4118709a58769/kotlinx-html-metadata-0.7.2.jar!/" />
-      </CLASSES>
-      <JAVADOC />
-      <SOURCES>
-        <root url="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlinx/kotlinx-html-common/0.7.2/866bbbfe0a81d49cdf19fd149adafbb938b35be4/kotlinx-html-common-0.7.2-sources.jar!/" />
-      </SOURCES>
-    </library>
-    <library name="Gradle: org.jetbrains.kotlinx:kotlinx-html-js:0.7.2" type="kotlin.js">
-      <CLASSES>
-        <root url="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlinx/kotlinx-html-js/0.7.2/baf7e494e549776d0ae3e0ee225804a513f5dc26/kotlinx-html-jslegacy-0.7.2.jar!/" />
-      </CLASSES>
-      <JAVADOC />
-      <SOURCES>
-        <root url="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlinx/kotlinx-html-js/0.7.2/b09bfd3565058174afa3fd0888743f8b8dca5406/kotlinx-html-js-0.7.2-sources.jar!/" />
-      </SOURCES>
-    </library>
-  </component>
-  <component name="masterDetails">
-    <states>
-      <state key="ProjectJDKs.UI">
-        <settings>
-          <last-edited>1.7</last-edited>
-          <splitter-proportions>
-            <option name="proportions">
-              <list>
-                <option value="0.2" />
-              </list>
-            </option>
-          </splitter-proportions>
-        </settings>
-      </state>
-    </states>
-  </component>
-</project>
--- a/komp.jsMain.iml
+++ b/komp.jsMain.iml
@@ -1,59 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<module external.linked.project.id="komp:jsMain" external.linked.project.path="$MODULE_DIR$" external.root.project.path="$MODULE_DIR$" external.system.id="GRADLE" external.system.module.group="nl.astraeus" external.system.module.type="sourceSet" external.system.module.version="0.3.0-SNAPSHOT" type="JAVA_MODULE" version="4">
-  <component name="FacetManager">
-    <facet type="kotlin-language" name="Kotlin">
-      <configuration version="3" platform="JavaScript " allPlatforms="JS []" useProjectSettings="false" isTestModule="false" externalProjectId="komp" pureKotlinSourceFolders="$MODULE_DIR$/src/jsMain/kotlin;/home/rnentjes/Development/komp/komp/build/externals/komp-jsLegacy/src;/home/rnentjes/Development/komp/komp/build/externals/komp-jsIr/src;/home/rnentjes/Development/komp/komp/src/jsTest/kotlin">
-        <dependsOnModuleNames>komp:commonMain</dependsOnModuleNames>
-        <sourceSets>
-          <sourceSet>komp.commonMain</sourceSet>
-        </sourceSets>
-        <newMppModelJpsModuleKind>COMPILATION_AND_SOURCE_SET_HOLDER</newMppModelJpsModuleKind>
-        <compilerSettings />
-        <compilerArguments>
-          <option name="outputFile" value="$MODULE_DIR$/build/js/packages/komp-jsLegacy/kotlin/komp-jsLegacy.js" />
-          <option name="noStdlib" value="true" />
-          <option name="sourceMap" value="true" />
-          <option name="metaInfo" value="true" />
-          <option name="target" value="v5" />
-          <option name="moduleKind" value="umd" />
-          <option name="main" value="call" />
-          <option name="languageVersion" value="1.4" />
-          <option name="apiVersion" value="1.4" />
-          <option name="pluginOptions">
-            <array />
-          </option>
-          <option name="pluginClasspaths">
-            <array>
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-script-runtime/1.4.32/bac50b0748be017dbc13fc1cb7231b1c9da0e106/kotlin-script-runtime-1.4.32.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-scripting-common/1.4.32/6abda0fe69677f0e46e7539fd185e4bd093b7258/kotlin-scripting-common-1.4.32.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-scripting-jvm/1.4.32/49656d531bfab9d6e45d3f27bc4d03b542d6766/kotlin-scripting-jvm-1.4.32.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-common/1.4.32/ef50bfa2c0491a11dcc35d9822edbfd6170e1ea2/kotlin-stdlib-common-1.4.32.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib/1.4.32/461367948840adbb0839c51d91ed74ef4a9ccb52/kotlin-stdlib-1.4.32.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlinx/kotlinx-coroutines-core/1.3.8/f62be6d4cbf27781c2969867b4ed952f38378492/kotlinx-coroutines-core-1.3.8.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains/annotations/13.0/919f0dfe192fb4e063e7dacadee7f8bb9a2672a9/annotations-13.0.jar" />
-            </array>
-          </option>
-          <option name="multiPlatform" value="true" />
-          <option name="errors">
-            <ArgumentParseErrors />
-          </option>
-        </compilerArguments>
-      </configuration>
-    </facet>
-  </component>
-  <component name="NewModuleRootManager">
-    <output url="file://$MODULE_DIR$/build/js/packages/komp-jsLegacy/kotlin" />
-    <exclude-output />
-    <content url="file://$MODULE_DIR$/build/externals/komp-jsIr/src" />
-    <content url="file://$MODULE_DIR$/build/externals/komp-jsLegacy/src" />
-    <content url="file://$MODULE_DIR$/src/jsMain">
-      <sourceFolder url="file://$MODULE_DIR$/src/jsMain/kotlin" type="kotlin-source" />
-    </content>
-    <orderEntry type="jdk" jdkName="Kotlin SDK" jdkType="KotlinSDK" />
-    <orderEntry type="sourceFolder" forTests="false" />
-    <orderEntry type="module" module-name="komp.commonMain" />
-    <orderEntry type="library" name="Gradle: org.jetbrains.kotlinx:kotlinx-html-js:0.7.2" level="project" />
-    <orderEntry type="library" name="Gradle: org.jetbrains.kotlin:kotlin-stdlib-js:1.4.32" level="project" />
-    <orderEntry type="library" name="Gradle: org.jetbrains.kotlin:kotlin-stdlib-common:1.4.32" level="project" />
-  </component>
-</module>
--- a/komp.jsTest.iml
+++ b/komp.jsTest.iml
@@ -1,70 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<module external.linked.project.id="komp:jsTest" external.linked.project.path="$MODULE_DIR$" external.root.project.path="$MODULE_DIR$" external.system.id="GRADLE" external.system.module.group="nl.astraeus" external.system.module.type="sourceSet" external.system.module.version="0.3.0-SNAPSHOT" type="JAVA_MODULE" version="4">
-  <component name="FacetManager">
-    <facet type="kotlin-language" name="Kotlin">
-      <configuration version="3" platform="JavaScript " allPlatforms="JS []" useProjectSettings="false" isTestModule="true" externalProjectId="komp" pureKotlinSourceFolders="$MODULE_DIR$/src/jsMain/kotlin;/home/rnentjes/Development/komp/komp/build/externals/komp-jsLegacy/src;/home/rnentjes/Development/komp/komp/build/externals/komp-jsIr/src;/home/rnentjes/Development/komp/komp/src/jsTest/kotlin">
-        <dependsOnModuleNames>komp:commonTest</dependsOnModuleNames>
-        <sourceSets>
-          <sourceSet>komp.commonTest</sourceSet>
-          <sourceSet>komp.jsMain</sourceSet>
-          <sourceSet>komp.commonMain</sourceSet>
-        </sourceSets>
-        <newMppModelJpsModuleKind>COMPILATION_AND_SOURCE_SET_HOLDER</newMppModelJpsModuleKind>
-        <externalSystemTestTasks>
-          <externalSystemTestTask>jsLegacyBrowserTest|komp:jsTest|jsLegacy</externalSystemTestTask>
-        </externalSystemTestTasks>
-        <compilerSettings />
-        <compilerArguments>
-          <option name="outputFile" value="$MODULE_DIR$/build/js/packages/komp-jsLegacy-test/kotlin/komp-jsLegacy-test.js" />
-          <option name="noStdlib" value="true" />
-          <option name="sourceMap" value="true" />
-          <option name="metaInfo" value="true" />
-          <option name="target" value="v5" />
-          <option name="moduleKind" value="umd" />
-          <option name="main" value="call" />
-          <option name="languageVersion" value="1.4" />
-          <option name="apiVersion" value="1.4" />
-          <option name="pluginOptions">
-            <array />
-          </option>
-          <option name="pluginClasspaths">
-            <array>
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-script-runtime/1.4.32/bac50b0748be017dbc13fc1cb7231b1c9da0e106/kotlin-script-runtime-1.4.32.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-scripting-common/1.4.32/6abda0fe69677f0e46e7539fd185e4bd093b7258/kotlin-scripting-common-1.4.32.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-scripting-jvm/1.4.32/49656d531bfab9d6e45d3f27bc4d03b542d6766/kotlin-scripting-jvm-1.4.32.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-common/1.4.32/ef50bfa2c0491a11dcc35d9822edbfd6170e1ea2/kotlin-stdlib-common-1.4.32.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib/1.4.32/461367948840adbb0839c51d91ed74ef4a9ccb52/kotlin-stdlib-1.4.32.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlinx/kotlinx-coroutines-core/1.3.8/f62be6d4cbf27781c2969867b4ed952f38378492/kotlinx-coroutines-core-1.3.8.jar" />
-              <option value="$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jetbrains/annotations/13.0/919f0dfe192fb4e063e7dacadee7f8bb9a2672a9/annotations-13.0.jar" />
-            </array>
-          </option>
-          <option name="multiPlatform" value="true" />
-          <option name="errors">
-            <ArgumentParseErrors />
-          </option>
-        </compilerArguments>
-      </configuration>
-    </facet>
-  </component>
-  <component name="NewModuleRootManager">
-    <output-test url="file://$MODULE_DIR$/build/js/packages/komp-jsLegacy-test/kotlin" />
-    <exclude-output />
-    <content url="file://$MODULE_DIR$/src/jsTest">
-      <sourceFolder url="file://$MODULE_DIR$/src/jsTest/kotlin" type="kotlin-test" />
-    </content>
-    <orderEntry type="jdk" jdkName="Kotlin SDK" jdkType="KotlinSDK" />
-    <orderEntry type="sourceFolder" forTests="false" />
-    <orderEntry type="module" module-name="komp.commonMain" scope="TEST" />
-    <orderEntry type="module" module-name="komp.commonTest" scope="TEST" production-on-test="" />
-    <orderEntry type="module" module-name="komp.jsMain" scope="TEST" />
-    <orderEntry type="module" module-name="komp.jsMain" scope="RUNTIME" />
-    <orderEntry type="library" scope="TEST" name="Gradle: org.jetbrains.kotlinx:kotlinx-html-js:0.7.2" level="project" />
-    <orderEntry type="library" scope="TEST" name="Gradle: org.jetbrains.kotlin:kotlin-test-js:1.4.32" level="project" />
-    <orderEntry type="library" scope="TEST" name="Gradle: org.jetbrains.kotlin:kotlin-stdlib-js:1.4.32" level="project" />
-    <orderEntry type="library" scope="TEST" name="Gradle: org.jetbrains.kotlinx:kotlinx-html-common:0.7.2" level="project" />
-    <orderEntry type="library" scope="TEST" name="Gradle: org.jetbrains.kotlin:kotlin-stdlib-common:1.4.32" level="project" />
-    <orderEntry type="library" scope="TEST" name="Gradle: org.jetbrains.kotlin:kotlin-test-common:1.4.32" level="project" />
-    <orderEntry type="library" scope="TEST" name="Gradle: org.jetbrains.kotlin:kotlin-test-annotations-common:1.4.32" level="project" />
-  </component>
-  <component name="TestModuleProperties" production-module="komp.jsMain" />
-</module>
--- a/readme.md
+++ b/readme.md
@@ -1,7 +1,11 @@
 # Komponent

+![Gradle CI](https://github.com/rnentjes/komponent/workflows/Gradle%20CI/badge.svg)
+
 Very simple helper to build single page apps with the Kotlin javascript target using static html builders.

 See the komp-todo repository for a basic example here: [komp-todo](https://github.com/rnentjes/komp-todo)

 For a more complete example take a look at the simple-password-manager repository: [simple-password-manager](https://github.com/rnentjes/simple-password-manager)
+
+Available on maven central: "nl.astraeus:kotlin-komponent-js:1.0.0"
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -1,16 +1,2 @@
-pluginManagement {
-    repositories {

-        maven { setUrl("https://dl.bintray.com/kotlin/kotlin-dev") }
-
-        maven { setUrl("https://dl.bintray.com/kotlin/kotlin-eap") }
-
-        mavenCentral()
-
-        maven { setUrl("https://plugins.gradle.org/m2/") }
-    }
-}
-
-rootProject.name = "komp"
-
-enableFeaturePreview("GRADLE_METADATA")
+rootProject.name = "kotlin-komponent"
--- a/src/commonMain/kotlin/nl/astraeus/komp/HtmlBuilderCommon.kt
+++ b/src/commonMain/kotlin/nl/astraeus/komp/HtmlBuilderCommon.kt
@@ -0,0 +1 @@
+package nl.astraeus.komp
--- a/src/jsMain/kotlin/nl/astraeus/komp/DiffPatch.kt
+++ b/src/jsMain/kotlin/nl/astraeus/komp/DiffPatch.kt
@@ -1,206 +0,0 @@
-package nl.astraeus.komp
-
-import org.w3c.dom.HTMLElement
-import org.w3c.dom.HTMLInputElement
-import org.w3c.dom.Node
-import org.w3c.dom.get
-
-object DiffPatch {
-
-  private fun updateKomponentOnNode(element: Node, newVdom: VDOMElement) {
-    val komponent = newVdom.komponent
-    if (komponent != null) {
-      if (Komponent.logReplaceEvent) {
-        console.log("Keeping oldNode, set oldNode element on Komponent", element, komponent)
-      }
-      komponent.element = element
-    }
-  }
-
-  fun updateNode(element: Node, oldVdom: VDOMElement, newVdom: VDOMElement): Node {
-    if (oldVdom.hash == newVdom.hash) {
-      if (Komponent.logReplaceEvent) {
-        console.log("Hashes match", oldVdom, newVdom, oldVdom.hash, newVdom.hash)
-      }
-
-      // no change
-      return element
-    }
-
-    if (oldVdom.type == newVdom.type && oldVdom.type == VDOMElementType.TEXT) {
-      if (oldVdom.content != newVdom.content) {
-        if (Komponent.logReplaceEvent) {
-          console.log("Updating text content", oldVdom, newVdom)
-        }
-        element.textContent = newVdom.content
-      }
-
-      return element
-    }
-
-    if (oldVdom.type == newVdom.type && oldVdom.type == VDOMElementType.TAG) {
-      if (oldVdom.content == newVdom.content) {
-        if (Komponent.logReplaceEvent) {
-          console.log("Update attributes", oldVdom.content, newVdom.content)
-        }
-        updateAttributes(element as HTMLElement, oldVdom, newVdom)
-        if (Komponent.logReplaceEvent) {
-          console.log("Update events", oldVdom.content, newVdom.content)
-        }
-        updateEvents(element as HTMLElement, oldVdom, newVdom)
-        if (Komponent.logReplaceEvent) {
-          console.log("Update children", oldVdom.content, newVdom.content)
-        }
-        updateKomponentOnNode(element, newVdom)
-        updateChildren(element, oldVdom, newVdom)
-
-        return element
-      }
-    }
-
-    if (Komponent.logReplaceEvent) {
-      console.log("Replace node (type)", newVdom.type, oldVdom, newVdom)
-    }
-
-    val newNode = newVdom.createElement()
-    updateKomponentOnNode(newNode, newVdom)
-    element.parentNode?.replaceChild(newNode, element)
-    return newNode
-  }
-
-  private fun updateAttributes(element: HTMLElement, oldVdom: VDOMElement, newVdom: VDOMElement) {
-    // removed attributes
-    for ((name, attr) in oldVdom.attributes) {
-      if (newVdom.attributes[name] == null) {
-        element.removeAttribute(name)
-      }
-    }
-
-    for ((name, value) in newVdom.attributes) {
-      val oldValue = oldVdom.attributes[name]
-
-      if (value != oldValue) {
-        element.setAttribute(name, value)
-      }
-    }
-
-    if (newVdom.content == "input" && oldVdom.content == "input") {
-      if (element is HTMLInputElement) {
-        element.value = newVdom.attributes["value"] ?: ""
-        element.checked = newVdom.attributes["checked"] == "true"
-      }
-    }
-  }
-
-  private fun updateChildren(
-    element: HTMLElement,
-    oldVdom: VDOMElement,
-    newVdom: VDOMElement
-  ) {
-    var oldIndex = 0
-    var newIndex = 0
-
-    if (Komponent.logReplaceEvent) {
-      console.log(
-        "updateChildren HTML old(${oldVdom.childNodes.size})",
-        oldVdom.toString()
-      )
-      console.log(
-        "updateChildren HTML new(${newVdom.childNodes.size})",
-        newVdom.toString()
-      )
-    }
-
-    while (oldIndex < oldVdom.childNodes.size && newIndex < newVdom.childNodes.size) {
-      if (Komponent.logReplaceEvent) {
-        console.log("Update Old/new", oldIndex, newIndex)
-      }
-      val oldChildNode = oldVdom.childNodes[oldIndex]
-      val newChildNode = newVdom.childNodes[newIndex]
-
-      if (Komponent.logReplaceEvent) {
-        console.log("Update node Old/new", oldChildNode, newChildNode)
-      }
-
-      // scenarios:
-      // - hashes match, next
-      // - hashes don't match:
-      // -- old hash is down in new list
-      // --- delta == 1, insert new node
-      // -- new hash is down in old list
-      // --- delta == 1, remove current else swap?
-      // else: replace current node with new
-
-      if (oldVdom.hash != newVdom.hash &&
-        newChildNode.type == VDOMElementType.TAG &&
-        oldChildNode.type == VDOMElementType.TAG
-      ) {
-        if (Komponent.logReplaceEvent) {
-          console.log("Hashes don't match")
-        }
-
-        val oldHash = oldChildNode.hash.hashCode()
-        val newHash = newChildNode.hash.hashCode()
-
-        val newHashIndexInOld = oldVdom.findNodeHashIndex(newHash)
-        val oldHashIndexInNew = newVdom.findNodeHashIndex(oldHash)
-
-        if (newHashIndexInOld == oldIndex + 1 && oldHashIndexInNew == newIndex) {
-          // remove
-          element.removeChild(element.childNodes[oldIndex]!!)
-          oldIndex++
-          continue
-        } else if (newHashIndexInOld == oldIndex && oldHashIndexInNew == newIndex + 1) {
-          // insert
-          element.insertBefore(newChildNode.createElement(), element.childNodes[oldIndex]!!)
-          newIndex++
-          oldIndex++
-          continue
-        }
-      }
-
-      // update
-      updateNode(element.childNodes[oldIndex]!!, oldChildNode, newChildNode)
-      oldIndex++
-      newIndex++
-    }
-
-    while (element.childNodes.length > newVdom.childNodes.size) {
-      element.childNodes[element.childNodes.length - 1]?.also {
-        if (Komponent.logReplaceEvent) {
-          console.log("Remove old node", it)
-        }
-
-        element.removeChild(it)
-      }
-    }
-
-    while (newIndex < newVdom.childNodes.size) {
-      newVdom.childNodes[newIndex].also {
-        element.appendChild(it.createElement())
-      }
-      newIndex++
-    }
-  }
-
-  private fun updateEvents(element: HTMLElement, oldVdom: VDOMElement, newVdom: VDOMElement) {
-    val oldEvents = oldVdom.events
-    val newEvents = newVdom.events
-
-    if (Komponent.logReplaceEvent) {
-      console.log("Update events", oldEvents, newEvents)
-    }
-
-    for ((name, event) in oldEvents) {
-      element.removeEventListener(name, event)
-    }
-
-    for ((name, event) in newEvents) {
-      if (Komponent.logReplaceEvent) {
-        console.log("Set event $event on", element)
-      }
-      element.addEventListener(name, event)
-    }
-  }
-
-}
--- a/src/jsMain/kotlin/nl/astraeus/komp/ElementExtentions.kt
+++ b/src/jsMain/kotlin/nl/astraeus/komp/ElementExtentions.kt
@@ -0,0 +1,157 @@
+package nl.astraeus.komp
+
+import org.w3c.dom.Element
+import org.w3c.dom.HTMLInputElement
+import org.w3c.dom.events.Event
+import org.w3c.dom.get
+
+private fun Int.asSpaces(): String {
+  val result = StringBuilder()
+
+  repeat(this) {
+    result.append(" ")
+  }
+  return result.toString()
+}
+
+fun Element.printTree(indent: Int = 0): String {
+  val result = StringBuilder()
+
+  result.append(indent.asSpaces())
+  result.append(tagName)
+  if (this.namespaceURI != "http://www.w3.org/1999/xhtml") {
+    result.append(" [")
+    result.append(namespaceURI)
+    result.append("]")
+  }
+  result.append(" (")
+  var first = true
+  if (hasAttributes()) {
+    for (index in 0 until attributes.length) {
+      if (!first) {
+        result.append(", ")
+      } else {
+        first = false
+      }
+      result.append(attributes[index]?.localName)
+      result.append("=")
+      result.append(attributes[index]?.value)
+    }
+  }
+  result.append(") {")
+  result.append("\n")
+  for ((name, event) in getKompEvents()) {
+    result.append(indent.asSpaces())
+    result.append("on")
+    result.append(name)
+    result.append(" -> ")
+    result.append(event)
+    result.append("\n")
+  }
+  for (index in 0 until childNodes.length) {
+    childNodes[index]?.let {
+      if (it is Element) {
+        result.append(it.printTree(indent + 2))
+      } else {
+        result.append((indent + 2).asSpaces())
+        result.append(it.textContent)
+        result.append("\n")
+      }
+    }
+  }
+  result.append(indent.asSpaces())
+  result.append("}\n")
+
+  return result.toString()
+}
+
+internal fun Element.setKompAttribute(attributeName: String, value: String?) {
+  //val attributeName = name.lowercase()
+  if (value == null || value.isBlank()) {
+    if (this is HTMLInputElement) {
+      when (attributeName) {
+        "checked" -> {
+          checked = false
+        }
+/*
+        "class" -> {
+          className = ""
+        }
+*/
+        "value" -> {
+          this.value = ""
+        }
+        else -> {
+          removeAttribute(attributeName)
+        }
+      }
+    } else {
+      removeAttribute(attributeName)
+    }
+  } else {
+    if (this is HTMLInputElement) {
+      when (attributeName) {
+        "checked" -> {
+          checked = "checked" == value
+        }
+/*
+        "class" -> {
+          className = value
+        }
+*/
+        "value" -> {
+          this.value = value
+        }
+        else -> {
+          setAttribute(attributeName, value)
+        }
+      }
+    } else if (this.getAttribute(attributeName) != value) {
+      setAttribute(attributeName, value)
+    }
+  }
+}
+
+internal fun Element.clearKompEvents() {
+  val events = getKompEvents()
+  for ((name, event) in getKompEvents()) {
+    removeEventListener(name, event)
+  }
+  events.clear()
+}
+
+internal fun Element.setKompEvent(name: String, event: (Event) -> Unit) {
+  val eventName: String = if (name.startsWith("on")) {
+    name.substring(2)
+  } else {
+    name
+  }
+
+  getKompEvents()[eventName] = event
+
+  this.addEventListener(eventName, event)
+}
+
+internal fun Element.getKompEvents(): MutableMap<String, (Event) -> Unit> {
+  var result: MutableMap<String, (Event) -> Unit>? = this.asDynamic()["komp-events"] as MutableMap<String, (Event) -> Unit>?
+
+  if (result == null) {
+    result = mutableMapOf()
+    this.asDynamic()["komp-events"] = result
+  }
+
+  return result
+}
+
+internal fun Element.findElementIndex(): Int {
+  val childNodes = parentElement?.children
+  if (childNodes != null) {
+    for (index in 0 until childNodes.length) {
+      if (childNodes[index] == this) {
+        return index
+      }
+    }
+  }
+
+  return 0
+}
--- a/src/jsMain/kotlin/nl/astraeus/komp/HtmlBuilder.kt
+++ b/src/jsMain/kotlin/nl/astraeus/komp/HtmlBuilder.kt
@@ -1,311 +1,451 @@
 package nl.astraeus.komp

 import kotlinx.browser.document
-import kotlinx.html.*
+import kotlinx.html.DefaultUnsafe
+import kotlinx.html.Entities
+import kotlinx.html.FlowOrMetaDataOrPhrasingContent
+import kotlinx.html.Tag
+import kotlinx.html.TagConsumer
+import kotlinx.html.Unsafe
 import org.w3c.dom.Element
+import org.w3c.dom.HTMLElement
+import org.w3c.dom.HTMLInputElement
+import org.w3c.dom.HTMLSpanElement
 import org.w3c.dom.Node
+import org.w3c.dom.asList
 import org.w3c.dom.events.Event
-import kotlin.collections.MutableList
-import kotlin.collections.MutableMap
-import kotlin.collections.arrayListOf
-import kotlin.collections.component1
-import kotlin.collections.component2
-import kotlin.collections.isNotEmpty
-import kotlin.collections.iterator
-import kotlin.collections.last
-import kotlin.collections.lastIndex
-import kotlin.collections.mutableListOf
-import kotlin.collections.mutableMapOf
-import kotlin.collections.set
-import kotlin.collections.withIndex
+import org.w3c.dom.get

-private fun attributeHash(key: String, value: String): Int =
-  3 * key.hashCode() +
-      5 * value.hashCode()
+private var currentElement: Element? = null

-private fun MutableMap<String, String>.kompHash(): Int {
-  var result = 0
+interface HtmlConsumer : TagConsumer<Element> {
+  fun append(node: Element)
+  fun include(komponent: Komponent)
+  fun debug(block: HtmlConsumer.() -> Unit)
+}

-  for ((name, value) in this) {
-    result += attributeHash(name, value)
+fun FlowOrMetaDataOrPhrasingContent.currentElement(): Element =
+  currentElement ?: error("No current element defined!")
+
+private data class ElementIndex(
+  val parent: Node,
+  var childIndex: Int,
+  var setAttr: MutableSet<String> = mutableSetOf()
+)
+
+private fun ArrayList<ElementIndex>.currentParent(): Node {
+  this.lastOrNull()?.let {
+    return it.parent
  }

-  return result
+  throw IllegalStateException("currentParent should never be null!")
 }

-private fun MutableMap<String, (Event) -> Unit>.kompHash(): Int {
-  var result = 0
-
-  for ((name, event) in this) {
-    result += attributeHash(name, event.toString())
+private fun ArrayList<ElementIndex>.currentElement(): Node? {
+  this.lastOrNull()?.let {
+    return it.parent.childNodes[it.childIndex]
  }

-  return result
+  return null
 }

-private fun MutableList<VDOMElement>.kompHash(): Int {
-  var result = 0
-
-  for (vdom in this) {
-    result += 3 * vdom.hash.hashCode()
+private fun ArrayList<ElementIndex>.currentPosition(): ElementIndex? {
+  return if (this.size < 2) {
+    null
+  } else {
+    this[this.size - 2]
  }
-
-  return result
 }

-enum class VDOMElementType {
-  TAG,
-  TEXT,
-  ENTITY,
-  UNSAFE,
-  COMMENT
-}
-
-class VDOMElementHash(
-  var baseHash: Int,
-  var contentHash: Int,
-  var typeHash: Int,
-  var namespaceHash: Int = 0,
-  var attributesHash: Int = 0,
-  var eventsHash: Int = 0,
-  var childNodesHash: Int = 0
-) {
-
-  override fun hashCode(): Int = baseHash +
-      3 * contentHash +
-      5 * typeHash +
-      7 * namespaceHash +
-      11 * attributesHash +
-      13 * eventsHash +
-      15 * childNodesHash
-
-  override fun equals(other: Any?): Boolean {
-    if (this === other) return true
-    if (other !is VDOMElementHash) return false
-
-    return other.hashCode() == this.hashCode()
+private fun ArrayList<ElementIndex>.nextElement() {
+  this.lastOrNull()?.let {
+    it.setAttr.clear()
+    it.childIndex++
  }
-
 }

-class VDOMElement(
-  val baseHash: Int,
-  var content: String,
-  var namespace: String? = null,
-  var type: VDOMElementType = VDOMElementType.TAG,
-) {
-  val attributes: MutableMap<String, String> = mutableMapOf()
-  val events: MutableMap<String, (Event) -> Unit> = mutableMapOf()
-  val childNodes: MutableList<VDOMElement> = mutableListOf()
+private fun ArrayList<ElementIndex>.pop() {
+  this.removeLast()
+}

-  val hash = VDOMElementHash(
-    baseHash,
-    content.hashCode(),
-    type.hashCode()
+private fun ArrayList<ElementIndex>.push(element: Node) {
+  this.add(ElementIndex(element, 0))
+}
+
+private fun ArrayList<ElementIndex>.replace(new: Node) {
+  if (this.currentElement() != null) {
+    this.currentElement()?.parentElement?.replaceChild(
+      new,
+      this.currentElement()!!
    )
-
-  var id: String = ""
-    set(value) {
-      field = value
-      attributes["id"] = value
-    }
-  var komponent: Komponent? = null
-
-  fun setKompEvent(event: String, value: (Event) -> Unit) {
-    val eventName = if (event.startsWith("on")) {
-      event.substring(2)
  } else {
-      event
-    }
-    val recalculate = events.containsKey(eventName)
-    events[eventName] = value
-    if (recalculate) {
-      hash.eventsHash = events.kompHash()
-    } else {
-      hash.eventsHash += attributeHash(eventName, value.toString())
-    }
-  }
-
-  fun appendChild(element: VDOMElement) {
-    childNodes.add(element)
-    //hash.childNodesHash += element.hash.hashCode()
-  }
-
-  fun updateChildHash() {
-    hash.childNodesHash = childNodes.kompHash()
-  }
-
-  fun removeAttribute(attr: String) {
-    if (attributes.containsKey(attr)) {
-      hash.attributesHash -= attributeHash(attr, attributes[attr] ?: "")
-    }
-    attributes.remove(attr)
-  }
-
-  fun setAttribute(attr: String, value: String) {
-    if (attributes.containsKey(attr)) {
-      hash.attributesHash -= attributeHash(attr, attributes[attr] ?: "")
-    }
-    if (attr.toLowerCase() == "id") {
-      id = value
-    }
-    attributes[attr] = value
-    hash.attributesHash += attributeHash(attr, value)
-  }
-
-  fun findNodeHashIndex(hash: Int): Int {
-    for ((index, node) in this.childNodes.withIndex()) {
-      if (node.type == VDOMElementType.TAG && node.hash.hashCode() == hash) {
-        return index
-      }
-    }
-
-    return -2
-  }
-
-  fun createElement(): Node {
-    val result = when (type) {
-      VDOMElementType.TAG -> {
-        val result: Element = if (namespace != null) {
-          document.createElementNS(namespace, content)
-        } else {
-          document.createElement(content)
-        }
-
-        for ((name, value) in attributes) {
-          result.setAttribute(name, value)
-        }
-
-        for ((name, value) in events) {
-          result.addEventListener(name, value)
-        }
-
-        for (child in childNodes) {
-          result.appendChild(child.createElement())
-        }
-
-        result
-      }
-      VDOMElementType.ENTITY,
-      VDOMElementType.UNSAFE,
-      VDOMElementType.TEXT -> {
-        document.createTextNode(content)
-      }
-      VDOMElementType.COMMENT -> {
-        document.createComment(content)
-      }
-    }
-
-    komponent?.also {
-      it.element = result
-    }
-
-    return result
+    this.last().parent.appendChild(new)
  }
 }

-interface HtmlConsumer : TagConsumer<VDOMElement> {
-  fun append(node: VDOMElement)
-}
+private fun Node.asElement() = this as? HTMLElement

 class HtmlBuilder(
-  val baseHash: Int
+  private val komponent: Komponent?,
+  parent: Element,
+  childIndex: Int = 0
 ) : HtmlConsumer {
-  private val path = arrayListOf<VDOMElement>()
-  private var lastLeaved: VDOMElement? = null
+  private var currentPosition = arrayListOf<ElementIndex>()
+  private var inDebug = false
+  private var exceptionThrown = false
+  private var currentNode: Node? = null
+  var root: Element? = null
+
+  init {
+    currentPosition.add(ElementIndex(parent, childIndex))
+  }
+
+  override fun include(komponent: Komponent) {
+    if (
+      komponent.element != null &&
+      !komponent.memoizeChanged()
+    ) {
+      currentPosition.replace(komponent.element!!)
+      if (Komponent.logRenderEvent) {
+        console.log(
+          "Skipped include $komponent, memoize hasn't changed"
+        )
+      }
+    } else {
+      komponent.create(
+        currentPosition.last().parent as Element,
+        currentPosition.last().childIndex
+      )
+    }
+    currentPosition.nextElement()
+  }
+
+  override fun append(node: Element) {
+    currentPosition.replace(node)
+    currentPosition.nextElement()
+  }
+
+  override fun debug(block: HtmlConsumer.() -> Unit) {
+    val enableAssertions = Komponent.enableAssertions
+    Komponent.enableAssertions = true
+    inDebug = true
+
+    try {
+      block.invoke(this)
+    } finally {
+      inDebug = false
+      Komponent.enableAssertions = enableAssertions
+    }
+  }
+
+  private fun logReplace(msg: () -> String) {
+    if (Komponent.logReplaceEvent && inDebug) {
+      console.log(msg.invoke())
+    }
+  }

  override fun onTagStart(tag: Tag) {
-    val element = VDOMElement(baseHash, tag.tagName, tag.namespace)
-
-    for (entry in tag.attributesEntries) {
-      element.setAttribute(entry.key, entry.value)
+    logReplace {
+      "onTagStart, [${tag.tagName}, ${tag.namespace}], currentPosition: $currentPosition"
    }

-    if (path.isNotEmpty()) {
-      path.last().appendChild(element)
-    }
+    currentNode = currentPosition.currentElement()

-    path.add(element)
-  }
-
-  override fun onTagAttributeChange(tag: Tag, attribute: String, value: String?) {
-    when {
-      path.isEmpty() -> throw IllegalStateException("No current tag")
-      path.last().content.toLowerCase() != tag.tagName.toLowerCase() -> throw IllegalStateException("Wrong current tag")
-      else -> path.last().let { node ->
-        if (value == null) {
-          node.removeAttribute(attribute)
+    if (currentNode == null) {
+      logReplace { "onTagStart, currentNode1: $currentNode" }
+      currentNode = if (tag.namespace != null) {
+        document.createElementNS(tag.namespace, tag.tagName)
      } else {
-          node.setAttribute(attribute, value)
+        document.createElement(tag.tagName)
      }
+
+      //logReplace"onTagStart, currentElement1.1: $currentNode")
+      currentPosition.currentParent().appendChild(currentNode!!)
+    } else if (
+      !currentNode?.asElement()?.tagName.equals(tag.tagName, true) ||
+      (
+          tag.namespace != null &&
+              !currentNode?.asElement()?.namespaceURI.equals(tag.namespace, true)
+          )
+    ) {
+      logReplace {
+        "onTagStart, currentElement, namespace: ${currentNode?.asElement()?.namespaceURI} -> ${tag.namespace}"
      }
+      logReplace {
+        "onTagStart, currentElement, replace: ${currentNode?.asElement()?.tagName} -> ${tag.tagName}"
+      }
+
+      currentNode = if (tag.namespace != null) {
+        document.createElementNS(tag.namespace, tag.tagName)
+      } else {
+        document.createElement(tag.tagName)
+      }
+
+      currentPosition.replace(currentNode!!)
+    }
+
+    currentElement = currentNode as? Element ?: currentElement
+
+    if (currentNode is Element) {
+      if (root == null) {
+        //logReplace"Setting root: $currentNode")
+        root = currentNode as Element
+      }
+
+      currentElement?.clearKompEvents()
+      (currentElement as? HTMLInputElement)?.checked = false
+
+      currentPosition.lastOrNull()?.setAttr?.clear()
+
+      // if currentElement = checkbox make sure it's cleared
+      for (entry in tag.attributesEntries) {
+        currentElement!!.setKompAttribute(entry.key, entry.value)
+        currentPosition.lastOrNull()?.setAttr?.add(entry.key)
      }
    }

-  override fun onTagEvent(tag: Tag, event: String, value: (Event) -> Unit) {
-    when {
-      path.isEmpty() -> throw IllegalStateException("No current tag")
-      path.last().content.toLowerCase() != tag.tagName.toLowerCase() -> throw IllegalStateException("Wrong current tag")
-      else -> path.last().setKompEvent(event, value)
+    currentPosition.push(currentNode!!)
  }
+
+  private fun checkTag(tag: Tag) {
+    check(currentElement != null) {
+      js("debugger")
+      "No current tag"
+    }
+    check(currentElement?.tagName.equals(tag.tagName, ignoreCase = true)) {
+      js("debugger")
+      "Wrong current tag"
+    }
+  }
+
+  override fun onTagAttributeChange(
+    tag: Tag,
+    attribute: String,
+    value: String?
+  ) {
+    logReplace { "onTagAttributeChange, ${tag.tagName} [$attribute, $value]" }
+
+    if (Komponent.enableAssertions) {
+      checkTag(tag)
+    }
+
+    currentElement?.setKompAttribute(attribute, value)
+    if (value == null || value.isEmpty()) {
+      currentPosition.currentPosition()?.setAttr?.remove(attribute)
+    } else {
+      currentPosition.currentPosition()?.setAttr?.add(attribute)
+    }
+  }
+
+  override fun onTagEvent(
+    tag: Tag,
+    event: String,
+    value: (Event) -> Unit
+  ) {
+    logReplace { "onTagEvent, ${tag.tagName} [$event, $value]" }
+
+    if (Komponent.enableAssertions) {
+      checkTag(tag)
+    }
+
+    currentElement?.setKompEvent(event.toLowerCase(), value)
  }

  override fun onTagEnd(tag: Tag) {
-    if (path.isEmpty() || path.last().content.toLowerCase() != tag.tagName.toLowerCase()) {
-      throw IllegalStateException("We haven't entered tag ${tag.tagName} but trying to leave")
+    if (exceptionThrown) {
+      return
    }

-    lastLeaved = path.removeAt(path.lastIndex)
-    lastLeaved?.updateChildHash()
+    while (currentPosition.currentElement() != null) {
+      currentPosition.currentElement()?.let {
+        it.parentElement?.removeChild(it)
+      }
+    }
+
+    if (Komponent.enableAssertions) {
+      checkTag(tag)
+    }
+
+    if (currentElement != null) {
+      val setAttrs: Set<String> = currentPosition.currentPosition()?.setAttr ?: setOf()
+
+      // remove attributes that where not set
+      val element = currentElement
+      if (element?.hasAttributes() == true) {
+        for (index in 0 until element.attributes.length) {
+          val attribute = element.attributes[index]
+          if (attribute?.name != null) {
+            val attr = attribute.name
+
+            if (
+              !setAttrs.contains(attr) &&
+              attr != "style"
+            ) {
+              element.setKompAttribute(attr, null)
+            }
+          }
+        }
+      }
+    }
+
+    currentPosition.pop()
+
+    currentNode = currentPosition.currentElement()
+    currentElement = currentNode as? Element ?: currentElement
+
+    currentPosition.nextElement()
+
+    currentElement = currentElement?.parentElement as? HTMLElement
+
+    //logReplace"onTagEnd, popped: $currentElement")
  }

  override fun onTagContent(content: CharSequence) {
-    if (path.isEmpty()) {
-      throw IllegalStateException("No current DOM node")
+    //logReplace"onTagContent, [$content]")
+
+    check(currentElement != null) {
+      "No current DOM node"
    }

-    path.last().appendChild(VDOMElement(baseHash, content.toString(), type = VDOMElementType.TEXT))
+    //logReplace"Tag content: $content")
+    if (
+      currentElement?.nodeType != Node.TEXT_NODE ||
+      currentElement?.textContent != content.toString()
+    ) {
+      currentElement?.textContent = content.toString()
+    }
+
+    currentPosition.nextElement()
  }

  override fun onTagContentEntity(entity: Entities) {
-    if (path.isEmpty()) {
-      throw IllegalStateException("No current DOM node")
+    //logReplace"onTagContentEntity, [${entity.text}]")
+
+    check(currentElement != null) {
+      "No current DOM node"
    }

-    // stupid hack as browsers don't support createEntityReference
-    path.last().appendChild(VDOMElement(baseHash, entity.text, type = VDOMElementType.ENTITY))
-  }
-
-  override fun append(node: VDOMElement) {
-    path.last().appendChild(node)
+    val s = document.createElement("span") as HTMLSpanElement
+    s.innerHTML = entity.text
+    currentPosition.replace(
+      s.childNodes.asList().firstOrNull() ?: document.createTextNode(entity.text)
+    )
+    currentPosition.nextElement()
  }

  override fun onTagContentUnsafe(block: Unsafe.() -> Unit) {
    with(DefaultUnsafe()) {
      block()

-      path.last().appendChild(VDOMElement(baseHash, toString(), type = VDOMElementType.UNSAFE))
+      val textContent = toString()
+
+      //logReplace"onTagContentUnsafe, [$textContent]")
+
+      var namespace: String? = null
+
+      if (currentPosition.currentParent().nodeType == 1.toShort()) {
+        val element = currentPosition.currentParent() as Element
+
+        namespace = when (Komponent.unsafeMode) {
+          UnsafeMode.UNSAFE_ALLOWED -> {
+            element.namespaceURI
+          }
+          UnsafeMode.UNSAFE_SVG_ONLY -> {
+            if (element.namespaceURI == "http://www.w3.org/2000/svg") {
+              element.namespaceURI
+            } else {
+              null
+            }
+          }
+          else -> {
+            null
+          }
+        }
+      }
+
+      //logReplace"onTagContentUnsafe, namespace: [$namespace]")
+
+      if (Komponent.unsafeMode == UnsafeMode.UNSAFE_ALLOWED ||
+            (
+              Komponent.unsafeMode == UnsafeMode.UNSAFE_SVG_ONLY &&
+              namespace == "http://www.w3.org/2000/svg"
+            )
+      ) {
+        if (currentElement?.innerHTML != textContent) {
+          currentElement?.innerHTML += textContent
+        }
+      } else if (currentElement?.textContent != textContent) {
+        currentElement?.textContent = textContent
+      }
+
+      currentPosition.nextElement()
    }
  }

  override fun onTagComment(content: CharSequence) {
-    if (path.isEmpty()) {
-      throw IllegalStateException("No current DOM node")
+    //logReplace"onTagComment, [$content]")
+
+    check(currentElement != null) {
+      "No current DOM node"
+    }
+    currentElement?.appendChild(
+      document.createComment(content.toString())
+    )
+
+    currentPosition.nextElement()
  }

-    path.last().appendChild(VDOMElement(baseHash, content.toString(), type = VDOMElementType.COMMENT))
+  override fun onTagError(tag: Tag, exception: Throwable) {
+    exceptionThrown = true
+
+    if (exception !is KomponentException) {
+      val position = mutableListOf<Element>()
+      var ce = currentElement
+      while (ce != null) {
+        position.add(ce)
+        ce = ce.parentElement
+      }
+      val builder = StringBuilder()
+      for (element in position.reversed()) {
+        builder.append("> ")
+        builder.append(element.tagName)
+        builder.append("[")
+        builder.append(element.findElementIndex())
+        builder.append("]")
+        if (element.hasAttribute("class")) {
+          builder.append("(")
+          builder.append(element.getAttribute("class"))
+          builder.append(")")
+        }
+        builder.append(" ")
      }

-  override fun finalize(): VDOMElement {
-    return lastLeaved ?: throw IllegalStateException("We can't finalize as there was no tags")
+      throw KomponentException(
+        komponent,
+        currentElement,
+        tag,
+        builder.toString(),
+        exception.message ?: "error",
+        exception
+      )
+    } else {
+      throw exception
+    }
+  }
+
+  override fun finalize(): Element {
+    //logReplace"finalize, currentPosition: $currentPosition")
+    return root ?: throw IllegalStateException(
+      "We can't finalize as there was no tags"
+    )
  }

  companion object {
-    fun create(content: HtmlBuilder.() -> Unit): VDOMElement {
-      val komponent = DummyKomponent()
-      val consumer = HtmlBuilder(komponent.hashCode())
+    fun create(content: HtmlBuilder.() -> Unit): Element {
+      val container = document.createElement("div") as HTMLElement
+      val consumer = HtmlBuilder(null, container)
      content.invoke(consumer)
-      return consumer.finalize()
+      return consumer.root ?: error("No root element found after render!")
    }
  }
 }
--- a/src/jsMain/kotlin/nl/astraeus/komp/Komponent.kt
+++ b/src/jsMain/kotlin/nl/astraeus/komp/Komponent.kt
@@ -1,142 +1,194 @@
 package nl.astraeus.komp

-import kotlinx.browser.document
 import kotlinx.browser.window
-import kotlinx.html.div
-import org.w3c.dom.HTMLDivElement
+import kotlinx.html.FlowOrMetaDataOrPhrasingContent
+import org.w3c.dom.Element
 import org.w3c.dom.HTMLElement
-import org.w3c.dom.Node
-import org.w3c.dom.css.CSSStyleDeclaration
-import kotlin.reflect.KProperty
+import org.w3c.dom.get

-typealias CssStyle = CSSStyleDeclaration.() -> Unit
+private var currentKomponent: Komponent? = null

-class StateDelegate<T>(
-  val komponent: Komponent,
-  initialValue: T
-) {
-  var value: T = initialValue
+fun FlowOrMetaDataOrPhrasingContent.currentKomponent(): Komponent =
+  currentKomponent ?: error("No current komponent defined! Only call from render code!")

-  operator fun getValue(thisRef: Any?, property: KProperty<*>): T {
-    return value
-  }
-
-  operator fun setValue(thisRef: Any?, property: KProperty<*>, value: T) {
-    if (this.value?.equals(value) != true) {
-      this.value = value
-      komponent.requestUpdate()
-    }
-  }
+enum class UnsafeMode {
+  UNSAFE_ALLOWED,
+  UNSAFE_DISABLED,
+  UNSAFE_SVG_ONLY
 }

-inline fun <reified T> Komponent.state(initialValue: T): StateDelegate<T> = StateDelegate(this, initialValue)
-
-fun HtmlConsumer.include(component: Komponent) {
-  append(component.create())
-}
-
-class DummyKomponent: Komponent() {
-  override fun HtmlBuilder.render() {
-    div {
-      + "dummy"
+var Element.memoizeHash: String?
+  get() {
+    return getAttribute("memoize-hash")
+  }
+  set(value) {
+    if (value != null) {
+      setAttribute("memoize-hash", value.toString())
+    } else {
+      removeAttribute("memoize-hash")
    }
  }
-}

 abstract class Komponent {
-  private var createIndex = getNextCreateIndex()
+  val createIndex = getNextCreateIndex()
  private var dirty: Boolean = true

-  var vdom: VDOMElement? = null
-  var element: Node? = null
-  val declaredStyles: MutableMap<String, CSSStyleDeclaration> = HashMap()
+  var element: Element? = null
+
+  open fun create(parent: Element, childIndex: Int? = null) {
+    onBeforeUpdate()
+    val builder = HtmlBuilder(
+      this,
+      parent,
+      childIndex ?: parent.childNodes.length
+    )

-  open fun create(): VDOMElement {
-    val consumer = HtmlBuilder(this.createIndex)
    try {
-      consumer.render()
-    } catch (e: Throwable) {
-      println("Exception occurred in ${this::class.simpleName}.render() call!")
-
-      throw e
-    }
-    val result = consumer.finalize()
-
-    if (result.id.isBlank()) {
-      result.id = "komp_${createIndex}"
+      currentKomponent = this
+      builder.render()
+    } catch(e: KomponentException) {
+      errorHandler(e)
+    } finally {
+      currentKomponent = null
    }

-    result.komponent = this
+    element = builder.root
+    updateMemoizeHash()
+    onAfterUpdate()
+  }

-    vdom = result
+  fun memoizeChanged() = element?.memoizeHash == null || element?.memoizeHash != fullMemoizeHash()

-    dirty = false
+  fun updateMemoizeHash() {
+    element?.memoizeHash = fullMemoizeHash()
+  }

-    return result
+  private fun fullMemoizeHash(): String? {
+    val generated = generateMemoizeHash()
+
+    return if (generated != null) {
+      "${this::class.simpleName}:${generateMemoizeHash()}"
+    } else {
+      null
+    }
  }

  abstract fun HtmlBuilder.render()

+  /**
+   * This method is called after the Komponent is updated
+   *
+   * note: it's also called at first render
+   */
+  open fun onAfterUpdate() {}
+
+  /**
+   * This method is called before the Komponent is updated
+   * and before memoizeHash is checked
+   *
+   * note: it's also called at first render
+   */
+  open fun onBeforeUpdate() {}
+
  fun requestUpdate() {
    dirty = true
    scheduleForUpdate(this)
  }

-  open fun style(className: String, vararg imports: CssStyle, block: CssStyle = {}) {
-    val style = (document.createElement("div") as HTMLDivElement).style
-    for (imp in imports) {
-      imp(style)
-    }
-    block(style)
-    declaredStyles[className] = style
+  /**
+   * Request an immediate update of this Komponent
+   *
+   * This will run immediately, make sure Komponents are not rendered multiple times
+   * Any scheduled updates will be run as well
+   */
+  fun requestImmediateUpdate() {
+    dirty = true
+    runUpdateImmediately(this)
  }

+  /**
+   * This function can be overwritten if you know how to update the Komponent yourself
+   *
+   * HTMLBuilder.render() is called 1st time the component is rendered, after that this
+   * method will be called
+   */
  open fun update() {
    refresh()
  }

-  internal fun refresh() {
-    val oldElement = vdom
+  /**
+   * If this function returns a value it will be stored and on the next render it will be compared.
+   *
+   * The render will only happen if the hash is not null and has changed
+   */
+  open fun generateMemoizeHash(): Int? = null

-    if (logRenderEvent) {
-      console.log("Rendering", this)
-    }
-    val newElement = create()
+  private fun refresh() {
+    val currentElement = element

-    element = if (oldElement != null && element != null) {
-      if (logReplaceEvent) {
-        console.log("DomDiffing", oldElement, newElement)
-      }
-      DiffPatch.updateNode(element!!, oldElement, newElement)
-    } else {
-      if (logReplaceEvent) {
-        console.log("Create", newElement)
-      }
-      newElement.createElement()
+    check(currentElement != null) {
+      error("element is null")
    }

-    vdom = newElement
+    val parent = currentElement.parentElement as? HTMLElement ?: error("parent is null!?")
+    var childIndex = 0
+    for (index in 0 until parent.childNodes.length) {
+      if (parent.childNodes[index] == currentElement) {
+        childIndex = index
+      }
+    }
+    val builder = HtmlBuilder(this, parent, childIndex)
+
+    try {
+      currentKomponent = this
+      builder.render()
+    } catch(e: KomponentException) {
+      errorHandler(e)
+    } finally {
+      currentKomponent = null
+    }
+
+    element = builder.root
    dirty = false
  }

+  override fun toString(): String {
+    return "${this::class.simpleName}"
+  }
+
  companion object {
    private var nextCreateIndex: Int = 1
    private var updateCallback: Int? = null
+    private var errorHandler: (KomponentException) -> Unit = { ke ->
+      console.error("Render error in Komponent", ke)
+
+      ke.element?.innerHTML = """<div class="komponent-error">Render error!</div>"""
+
+      window.alert("""
+        Error in Komponent '${ke.komponent}', ${ke.message}
+        Tag: ${ke.tag.tagName}
+        See console log for details
+        Position: ${ke.position}""".trimIndent()
+      )
+    }
    private var scheduledForUpdate = mutableSetOf<Komponent>()
+    private var interceptor: (Komponent, () -> Unit) -> Unit = { _, block -> block() }

    var logRenderEvent = false
    var logReplaceEvent = false
+    var enableAssertions = false
+    var unsafeMode = UnsafeMode.UNSAFE_DISABLED

-    fun create(parent: HTMLElement, component: Komponent, insertAsFirst: Boolean = false) {
-      val vdomElement = component.create()
-      val element = vdomElement.createElement()
-      component.element = element
-
-      if (insertAsFirst && parent.childElementCount > 0) {
-        parent.insertBefore(element, parent.firstChild)
-      } else {
-        parent.appendChild(element)
+    fun create(parent: HTMLElement, component: Komponent) {
+      component.create(parent)
    }
+
+    fun setErrorHandler(handler: (KomponentException) -> Unit) {
+      errorHandler = handler
+    }
+
+    fun setUpdateInterceptor(block: (Komponent, () -> Unit) -> Unit) {
+      interceptor = block
    }

    private fun getNextCreateIndex() = nextCreateIndex++
@@ -151,6 +203,11 @@ abstract class Komponent {
      }
    }

+    private fun runUpdateImmediately(komponent: Komponent) {
+      scheduledForUpdate.add(komponent)
+      runUpdate()
+    }
+
    private fun runUpdate() {
      val todo = scheduledForUpdate.sortedBy { komponent -> komponent.createIndex }

@@ -159,25 +216,32 @@ abstract class Komponent {
      }

      todo.forEach { next ->
+        interceptor(next) {
          val element = next.element

          if (element is HTMLElement) {
-          if (document.getElementById(element.id) != null) {
            if (next.dirty) {
              if (logRenderEvent) {
                console.log("Update dirty ${next.createIndex}")
              }
+              val memoizeHash = next.generateMemoizeHash()
+
+              if (next.memoizeChanged()) {
+                next.onBeforeUpdate()
                next.update()
+                next.updateMemoizeHash()
+                next.onAfterUpdate()
+              } else if (logRenderEvent) {
+                console.log("Skipped render, memoizeHash is equal $next-[$memoizeHash]")
+              }
            } else {
              if (logRenderEvent) {
                console.log("Skip ${next.createIndex}")
              }
            }
          } else {
-            console.log("Komponent element has no id, ", next, element)
+            console.log("Komponent element is null", next, element)
          }
-        } else {
-          console.log("Komponent element is null", next)
        }
      }

--- a/src/jsMain/kotlin/nl/astraeus/komp/KomponentException.kt
+++ b/src/jsMain/kotlin/nl/astraeus/komp/KomponentException.kt
@@ -0,0 +1,18 @@
+package nl.astraeus.komp
+
+import kotlinx.html.Tag
+import org.w3c.dom.Element
+
+class KomponentException(
+  val komponent: Komponent?,
+  val element: Element?,
+  val tag: Tag,
+  val position: String,
+  message: String,
+  cause: Throwable
+) : RuntimeException(message, cause) {
+
+  override fun toString(): String {
+    return "KompException(message='$message', tag='$tag', position='$position')"
+  }
+}
--- a/src/jsMain/kotlin/nl/astraeus/komp/MutableCollectionStateDelegate.kt
+++ b/src/jsMain/kotlin/nl/astraeus/komp/MutableCollectionStateDelegate.kt
@@ -0,0 +1,54 @@
+package nl.astraeus.komp
+
+inline fun <reified T> Komponent.mutableCollectionState(
+  initialValue: MutableCollection<T>
+): MutableCollection<T> = MutableCollectionStateDelegate(
+  this,
+  initialValue
+)
+
+class MutableCollectionStateDelegate<T>(
+  val komponent: Komponent,
+  val collection: MutableCollection<T>
+): MutableCollection<T> by collection {
+
+  override fun add(element: T): Boolean {
+    komponent.requestUpdate()
+
+    return collection.add(element)
+  }
+
+  override fun addAll(elements: Collection<T>): Boolean {
+    komponent.requestUpdate()
+
+    return collection.addAll(elements)
+  }
+
+  override fun clear() {
+    komponent.requestUpdate()
+
+    collection.clear()
+  }
+
+  // todo: return iterator wrapper to update at changes?
+  // override fun iterator(): MutableIterator<T> = collection.iterator()
+
+  override fun remove(element: T): Boolean {
+    komponent.requestUpdate()
+
+    return collection.remove(element)
+  }
+
+  override fun removeAll(elements: Collection<T>): Boolean {
+    komponent.requestUpdate()
+
+    return collection.removeAll(elements)
+  }
+
+  override fun retainAll(elements: Collection<T>): Boolean {
+    komponent.requestUpdate()
+
+    return collection.retainAll(elements)
+  }
+
+}
--- a/src/jsMain/kotlin/nl/astraeus/komp/State.kt
+++ b/src/jsMain/kotlin/nl/astraeus/komp/State.kt
@@ -0,0 +1,56 @@
+package nl.astraeus.komp
+
+import kotlin.reflect.KProperty
+
+interface Delegate<T> {
+
+  operator fun getValue(
+    thisRef: Any?,
+    property: KProperty<*>
+  ): T
+
+  operator fun setValue(
+    thisRef: Any?,
+    property: KProperty<*>,
+    value: T
+  )
+}
+
+
+open class StateDelegate<T>(
+  val komponent: Komponent,
+  initialValue: T
+) : Delegate<T> {
+  private var value: T = initialValue
+
+  init {
+    if (value is MutableCollection<*>) {
+      error("Use mutableList to create a collection!")
+    }
+  }
+
+  override operator fun getValue(
+    thisRef: Any?,
+    property: KProperty<*>
+  ): T {
+    return value
+  }
+
+  override operator fun setValue(
+    thisRef: Any?,
+    property: KProperty<*>,
+    value: T
+  ) {
+    if (this.value?.equals(value) != true) {
+      this.value = value
+      komponent.requestUpdate()
+    }
+  }
+}
+
+inline fun <reified T> Komponent.state(
+  initialValue: T
+): Delegate<T> = StateDelegate(
+      this,
+      initialValue
+    )
--- a/src/jsTest/kotlin/nl/astraeus/komp/TestUpdate.kt
+++ b/src/jsTest/kotlin/nl/astraeus/komp/TestUpdate.kt
@@ -1,144 +1,247 @@
 package nl.astraeus.komp

-import kotlinx.html.*
+import kotlinx.browser.document
+import kotlinx.html.InputType
+import kotlinx.html.classes
+import kotlinx.html.div
+import kotlinx.html.i
+import kotlinx.html.id
+import kotlinx.html.input
 import kotlinx.html.js.onClickFunction
+import kotlinx.html.p
+import kotlinx.html.span
+import kotlinx.html.svg
+import kotlinx.html.table
+import kotlinx.html.td
+import kotlinx.html.tr
+import kotlinx.html.unsafe
 import org.w3c.dom.Element
-import org.w3c.dom.HTMLElement
-import org.w3c.dom.get
+import org.w3c.dom.HTMLDivElement
 import kotlin.test.Test
-import kotlin.test.assertTrue

-fun nodesEqual(element: Element, vdom: VDOMElement): Boolean {
-  if (element.childNodes.length != vdom.childNodes.size) {
-    return false
-  }
-  if (element.attributes.length != vdom.attributes.size) {
-    return false
-  }
-  for ((name, value) in vdom.attributes) {
-    if (value != element.getAttribute(name)) {
-      return false
+class TestKomponent : Komponent() {
+  override fun HtmlBuilder.render() {
+    div {
+      +"Test"
    }
  }
-  for ((index, child) in vdom.childNodes.withIndex()) {
-    if (index < element.childNodes.length) {
-      val elementChild = element.childNodes[index]
+}

-      if (child.type == VDOMElementType.TAG) {
-        if (!nodesEqual(elementChild as HTMLElement, child)) {
-          return false
+class Child1 : Komponent() {
+  override fun HtmlBuilder.render() {
+    div {
+      +"Child 1"
    }
-      } else if (child.type == VDOMElementType.TEXT) {
-        if (child.content != element.textContent) {
-          return false
  }
+}
+
+class Child2 : Komponent() {
+  override fun HtmlBuilder.render() {
+    div {
+      id ="1234"
+      +"Child 2"
+    }
+  }
+}
+
+class SimpleKomponent : Komponent() {
+  var hello = true
+  var append = HtmlBuilder.create {
+    p {
+      +"Appended"
+    }
+  }
+
+  override fun HtmlBuilder.render() {
+    div("div_class") {
+      input(InputType.checkBox) {
+        name = "helloInput"
+        checked = hello
+      }
+      span {
+        svg {
+          unsafe {
+            +"""
+              <p bla>
+            """.trimIndent()
+          }
+        }
+        if (hello) {
+          div {
+            +"Hello"
          }
        } else {
-      return false
+          span {
+            +"Good bye"
+          }
+        }
+      }
+      div {
+        if (hello) {
+          id = "123"
+          +"div text"
+        } else {
+          +"div text goodbye"
+        }
+
+        onClickFunction = if (hello) {
+          {
+            println("onClick")
+          }
+        } else {
+          {
+            println("onClick 2")
+          }
+        }
+      }
+      if (hello) {
+        span {
+          +"2nd span"
+        }
+      }
+      //append(append)
+      if (hello) {
+        include(Child1())
+      } else {
+        include(Child2())
+      }
+      //append(append)
    }
  }

-  return true
+}
+
+class IncludeKomponent(
+  var text: String = "My Text"
+) : Komponent() {
+
+  override fun generateMemoizeHash(): Int = text.hashCode()
+
+  override fun HtmlBuilder.render() {
+    span {
+      +text
+    }
+  }
+}
+
+class ReplaceKomponent : Komponent() {
+  val includeKomponent = IncludeKomponent()
+  var includeSpan = true
+
+  override fun generateMemoizeHash(): Int = includeSpan.hashCode() * 7 + includeKomponent.generateMemoizeHash()
+
+  override fun HtmlBuilder.render() {
+    div {
+      +"Child 2"
+
+      div {
+        if (includeSpan) {
+          span {
+            i("fas fa-eye") {
+              +"span1"
+            }
+          }
+          span {
+            i("fas fa-eye") {
+              +"span2"
+            }
+          }
+          span {
+            i("fas fa-eye") {
+              +"span3"
+            }
+          }
+        }
+
+        include(includeKomponent)
+      }
+    }
+  }
 }

 class TestUpdate {

  @Test
-  fun testCompare() {
-    val dom1 = HtmlBuilder.create {
-      div {
-        div(classes = "bla") {
-          span {
-            +" Some Text "
-          }
-          table {
-            tr {
-              td {
-                +"Table column"
-              }
-            }
-          }
-        }
-      }
-    }
-
-    val dom2 = HtmlBuilder.create {
-      div {
-        span {
-          id = "123"
-
-          +"New dom!"
-        }
-        input {
-          value = "bla"
-        }
-      }
-    }
-
-    var element = dom1.createElement()
-
-    assertTrue(nodesEqual(element as Element, dom1), "Created dom not equal to original")
-
-    element = DiffPatch.updateNode(element, dom1, dom2) as HTMLElement
-
-    assertTrue(nodesEqual(element, dom2), "Updated dom not equal to original")
-  }
-
-  @Test
-  fun testCompare2() {
-    val dom1 = HtmlBuilder.create {
-      div {
-        div(classes = "bla") {
-          span {
-            +" Some Text "
-          }
-          table {
-            tr {
-              th {
-                +"Header"
-              }
-            }
-            tr {
-              td {
-                +"Table column"
-              }
-            }
-          }
-        }
-      }
-    }
-
-    val dom2 = HtmlBuilder.create {
-      div {
-        div {
-          span {
-            +"Other text"
-          }
-        }
-        span {
-          id = "123"
-
-          +"New dom!"
-        }
-        input {
-          value = "bla"
-
-          onClickFunction = {
-            println("Clickerdyclick!")
-          }
-        }
-      }
-    }
+  fun testUpdateWithEmpty() {
+    val div = document.createElement("div") as HTMLDivElement
+    val rk = ReplaceKomponent()

    Komponent.logRenderEvent = true

-    var element = dom1.createElement()
+    Komponent.create(div, rk)

-    assertTrue(nodesEqual(element as Element, dom1), "Created dom not equal to original")
+    println("ReplaceKomponent: ${div.printTree()}")

-    element = DiffPatch.updateNode(element, dom1, dom2) as HTMLElement
+    rk.requestImmediateUpdate()

-    assertTrue(nodesEqual(element, dom2), "Updated dom not equal to original")
+    println("ReplaceKomponent: ${div.printTree()}")
+
+    rk.requestImmediateUpdate()
+
+    println("ReplaceKomponent: ${div.printTree()}")
+
+    rk.includeSpan = false
+    rk.requestImmediateUpdate()
+
+    println("ReplaceKomponent: ${div.printTree()}")
+
+    rk.includeSpan = true
+    rk.includeKomponent.text = "New Text"
+    rk.requestImmediateUpdate()
+
+    println("ReplaceKomponent: ${div.printTree()}")
+  }
+
+  @Test
+  fun testSimpleKomponent() {
+    val sk = SimpleKomponent()
+    val div = document.createElement("div") as HTMLDivElement
+
+    Komponent.create(div, sk)
+
+    println("SimpleKomponent: ${div.printTree()}")
+
+    sk.hello = false
+    sk.requestImmediateUpdate()
+
+    println("SimpleKomponent updated: ${div.printTree()}")
+  }
+
+  @Test
+  fun testCreate() {
+    var elemTest: Element? = null
+    val element = HtmlBuilder.create {
+      div(classes = "div_class") {
+        classes = classes + "bla'"
+        id = "123"
+        +"Test"
+
+        span("span_class") {
+          +"Span"
+
+          elemTest = currentElement()
+        }
+
+        table {
+          tr {
+            td {
+              +"column 1"
+            }
+            td {
+              +"column 2"
+            }
+          }
+        }
+      }
+    }
+
+    println("Element: ${element.printTree()}")
+    println("divTst: ${elemTest?.printTree()}")
+    println("span class: ${
+      elemTest?.getAttributeNames()?.joinToString
+      { "," }
+    }"
+    )
  }

 }
Author	SHA1	Message	Date
rnentjes	e82c4b2091	Common code initial	2022-10-14 16:56:21 +02:00
rnentjes	ccc07a3545	v. 1.0.8-SNAPSHOT	2022-10-14 16:55:49 +02:00
rnentjes	981bceacfb	v. 1.0.7 upgrade to Kotlin 1.7.20	2022-10-14 16:51:06 +02:00
rnentjes	1b93c54cf4	Fixes	2022-08-10 20:53:06 +02:00
rnentjes	5f7fde44c6	Version 1.0.6 - Fix attr vs property checkbox update	2022-03-03 14:28:13 +01:00
rnentjes	d9d3d0f786	Version 1.0.5	2022-02-25 19:21:40 +01:00
rnentjes	bb8e8e0be9	Version to 1.0.5-SNAPSHOT	2022-02-25 11:55:31 +01:00
rnentjes	6c24547cba	Version 1.0.4	2022-02-25 11:54:57 +01:00
rnentjes	147c934819	Fix update & replace options	2022-02-24 15:12:57 +01:00
rnentjes	cbf76f18a2	Add update/replace option Took 1 hour 4 minutes	2022-02-23 21:40:57 +01:00
rnentjes	9a1d9ece25	v. 1.0.3 - Replace i.o. update DOM Took 45 seconds	2022-02-07 17:37:48 +01:00
rnentjes	a30b0e8684	Update to snapshot Took 4 minutes	2022-02-07 17:37:04 +01:00
rnentjes	32ec77f918	Version 1.0.2 - Fix class replacement	2022-02-04 12:34:58 +01:00
rnentjes	20cf1f99df	Merge branch 'master' of https://github.com/rnentjes/komponent	2022-02-01 12:03:41 +01:00
rnentjes	f82ef1da70	v. 1.0.1 - Added error handler and default error handling. Took 1 hour 47 minutes	2022-02-01 12:02:19 +01:00
rnentjes	88625e65a4	Getting started	2022-01-16 14:52:15 +01:00
rnentjes	0b12c37558	Add mutableCollectionState and docs.	2022-01-16 14:50:58 +01:00
Rien	37dd99be48	Update readme.md	2022-01-14 16:29:05 +01:00
rnentjes	ebb8e9a3c5	Fix build	2022-01-14 16:20:17 +01:00
rnentjes	67b8be2528	Merge remote-tracking branch 'github/master'	2022-01-14 16:01:36 +01:00
rnentjes	dcd7b4362b	Clean up, release v. 1.0.0	2022-01-14 16:00:46 +01:00
rnentjes	5bfb23305a	Prepare version 1.0.0	2021-12-24 11:11:22 +01:00
rnentjes	b0a71352cf	Update git ignore	2021-12-06 09:07:50 +01:00
rnentjes	84176a93de	v. 0.5.12 - fix child index in refresh Took 4 minutes	2021-12-05 15:08:00 +01:00
rnentjes	b6693d149c	v. 0.5.9-SNAPSHOT Took 1 minute	2021-12-04 11:50:46 +01:00
rnentjes	80a9a28731	Fix Komponent.create, v. 0.5.8 Took 7 minutes	2021-12-04 11:49:36 +01:00
rnentjes	db8fc642cf	Snaphot Took 4 seconds	2021-08-30 12:39:39 +02:00
rnentjes	307a8476ec	Fix memoizeChanged logic, v. 0.5.7	2021-08-19 14:27:20 +02:00
rnentjes	e969311dec	Merge branch direct-update into master, v. 0.5.6	2021-08-19 09:55:02 +02:00
Rien	aed62f93f1	Update readme.md	2021-02-10 14:22:57 +01:00
Rien	169bf2a509	Update readme.md	2021-02-10 14:22:46 +01:00