Use ML completion extension point from 193 platform

- completion-ranking-kotlin jar used to be in the IDEA itself; thanks to new extension it can reside in the plugin from now on
- ML completion is turned off by default
- use `implementation` dependency because `completion-ranking-kotlin` is required during runtime

build.gradle.kts

@@ -164,6 +164,7 @@ extra["versions.org.springframework"] = "4.2.0.RELEASE"
 extra["versions.jflex"] = "1.7.0"
 extra["versions.markdown"] = "0.1.25"
 extra["versions.trove4j"] = "1.0.20181211"
+extra["versions.completion-ranking-kotlin"] = "0.0.2"
 
 // NOTE: please, also change KTOR_NAME in pathUtil.kt and all versions in corresponding jar names in daemon tests.
 extra["versions.ktor-network"] = "1.0.1"

idea/build.gradle.kts

@@ -5,6 +5,7 @@ plugins {
 
 repositories {
     maven("https://jetbrains.bintray.com/markdown")
+    maven("https://jetbrains.bintray.com/intellij-third-party-dependencies")
 }
 
 sourceSets {
@@ -103,6 +104,10 @@ dependencies {
         testRuntime(intellijPluginDep("java"))
     }
 
+    Platform[193].orHigher {
+        implementation(commonDep("org.jetbrains.intellij.deps.completion", "completion-ranking-kotlin"))
+    }
+
     compileOnly(commonDep("org.jetbrains", "markdown"))
     compileOnly(commonDep("com.google.code.findbugs", "jsr305"))
     compileOnly(intellijPluginDep("IntelliLang"))

idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/ml/KotlinMLRankingProvider.kt.193

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.idea.completion.ml
+
+import com.completion.ranker.model.kotlin.MLWhiteBox
+import com.intellij.internal.ml.DecisionFunction
+import com.intellij.internal.ml.ModelMetadata
+import com.intellij.internal.ml.completion.CompletionRankingModelBase
+import com.intellij.internal.ml.completion.JarCompletionModelProvider
+import com.intellij.lang.Language
+
+@Suppress("UnstableApiUsage")
+class KotlinMLRankingProvider : JarCompletionModelProvider("Kotlin", "kotlin_features") {
+    override fun createModel(metadata: ModelMetadata): DecisionFunction {
+        return object : CompletionRankingModelBase(metadata) {
+            override fun predict(features: DoubleArray?): Double = MLWhiteBox.makePredict(features)
+        }
+    }
+
+    override fun isLanguageSupported(language: Language): Boolean = language.id.equals("kotlin", ignoreCase = true)
+}

idea/idea-completion/tests/org/jetbrains/kotlin/idea/completion/test/KotlinModelMetadataTest.kt.193

@@ -0,0 +1,14 @@
+/*
+ * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.idea.completion.test
+
+import org.jetbrains.kotlin.idea.completion.ml.KotlinMLRankingProvider
+import org.junit.Test
+
+class KotlinModelMetadataTest {
+    @Test
+    fun testMetadataConsistent() = KotlinMLRankingProvider().assertModelMetadataConsistent()
+}

idea/resources/META-INF/plugin.xml.193

@@ -81,5 +81,7 @@ The Kotlin plugin provides language support in IntelliJ IDEA and Android Studio.
 
       <trafficLightRendererContributor implementation="org.jetbrains.kotlin.idea.core.script.ScriptTrafficLightRendererContributor"/>
       <fileTypeUsageSchemaDescriptor schema="Gradle Script" implementationClass="org.jetbrains.kotlin.idea.core.script.KotlinGradleScriptFileTypeSchemaDetector"/>
+
+      <completion.ml.model implementation="org.jetbrains.kotlin.idea.completion.ml.KotlinMLRankingProvider"/>
     </extensions>
 </idea-plugin>