Allow value rendering using renderers processor from API

jupyter-lib/api/src/main/kotlin/org/jetbrains/kotlinx/jupyter/api/Notebook.kt

@@ -63,4 +63,10 @@ interface Notebook {
      * Current JRE info
      */
     val jreInfo: JREInfoProvider
+
+    /**
+     * Renderers processor gives an ability to render values and
+     * and add new renderers
+     */
+    val renderersProcessor: TypeRenderersProcessor
 }

jupyter-lib/api/src/main/kotlin/org/jetbrains/kotlinx/jupyter/api/TypeRenderersProcessor.kt

@@ -0,0 +1,21 @@
+package org.jetbrains.kotlinx.jupyter.api
+
+import org.jetbrains.kotlinx.jupyter.api.libraries.ExecutionHost
+
+/**
+ * [TypeRenderersProcessor] is responsible for rendering objects.
+ * You may use it to render values exactly like notebook renders results,
+ * and also register new renderers in runtime.
+ */
+interface TypeRenderersProcessor {
+    /**
+     * Renders [value] in context of this execution [host]
+     */
+    fun renderValue(host: ExecutionHost, value: Any?): Any?
+
+    /**
+     * Adds new [renderer] for this notebook.
+     * Don't turn on the optimizations for [PrecompiledRendererTypeHandler]
+     */
+    fun registerWithoutOptimizing(renderer: RendererTypeHandler)
+}

jupyter-lib/api/src/main/kotlin/org/jetbrains/kotlinx/jupyter/api/libraries/JupyterIntegration.kt

@@ -71,10 +71,14 @@ abstract class JupyterIntegration : LibraryDefinitionProducer {
         }
 
         inline fun <reified T : Any> render(noinline renderer: CodeCell.(T) -> Any) {
-            val execution = ResultHandlerExecution { _, property ->
+            return renderWithHost { _, value: T -> renderer(this, value) }
+        }
+
+        inline fun <reified T : Any> renderWithHost(noinline renderer: CodeCell.(ExecutionHost, T) -> Any) {
+            val execution = ResultHandlerExecution { host, property ->
                 val currentCell = notebook.currentCell
                     ?: throw IllegalStateException("Current cell should not be null on renderer invocation")
-                FieldValue(renderer(currentCell, property.value as T), property.name)
+                FieldValue(renderer(currentCell, host, property.value as T), property.name)
             }
             addRenderer(SubtypeRendererTypeHandler(T::class, execution))
         }

jupyter-lib/shared-compiler/src/main/kotlin/org/jetbrains/kotlinx/jupyter/codegen/ResultsTypeRenderersProcessor.kt

@@ -0,0 +1,22 @@
+package org.jetbrains.kotlinx.jupyter.codegen
+
+import org.jetbrains.kotlinx.jupyter.api.Code
+import org.jetbrains.kotlinx.jupyter.api.FieldValue
+import org.jetbrains.kotlinx.jupyter.api.PrecompiledRendererTypeHandler
+import org.jetbrains.kotlinx.jupyter.api.RendererTypeHandler
+import org.jetbrains.kotlinx.jupyter.api.TypeRenderersProcessor
+import org.jetbrains.kotlinx.jupyter.api.libraries.ExecutionHost
+
+interface ResultsTypeRenderersProcessor : TypeRenderersProcessor {
+    /**
+     * Renders cell result [field] represented as [FieldValue] in the [host] context
+     */
+    fun renderResult(host: ExecutionHost, field: FieldValue): Any?
+
+    /**
+     * Adds new [renderer] for this notebook.
+     * Returns code to be executed on execution host
+     * for [PrecompiledRendererTypeHandler]'s.
+     */
+    fun register(renderer: RendererTypeHandler): Code?
+}

src/main/kotlin/org/jetbrains/kotlinx/jupyter/apiImpl.kt

@@ -8,6 +8,7 @@ import org.jetbrains.kotlinx.jupyter.api.DisplayResultWithCell
 import org.jetbrains.kotlinx.jupyter.api.JREInfoProvider
 import org.jetbrains.kotlinx.jupyter.api.KotlinKernelVersion
 import org.jetbrains.kotlinx.jupyter.api.Notebook
+import org.jetbrains.kotlinx.jupyter.api.TypeRenderersProcessor
 import java.lang.IllegalStateException
 
 class DisplayResultWrapper private constructor(
@@ -98,6 +99,7 @@ class NotebookImpl(
     private val runtimeProperties: ReplRuntimeProperties,
 ) : Notebook {
     private val cells = hashMapOf<Int, CodeCellImpl>()
+    internal var typeRenderersProcessor: TypeRenderersProcessor? = null
 
     override val cellsList: Collection<CodeCellImpl>
         get() = cells.values
@@ -156,4 +158,7 @@ class NotebookImpl(
 
     override val lastCell: CodeCellImpl?
         get() = history(1)
+
+    override val renderersProcessor: TypeRenderersProcessor
+        get() = typeRenderersProcessor ?: throw IllegalStateException("Type renderers processor is not initialized yet")
 }

src/main/kotlin/org/jetbrains/kotlinx/jupyter/codegen/TypeRenderersProcessorImpl.kt

@@ -11,7 +11,7 @@ import org.jetbrains.kotlinx.jupyter.repl.ContextUpdater
 
 class TypeRenderersProcessorImpl(
     private val contextUpdater: ContextUpdater,
-) : TypeRenderersProcessor {
+) : ResultsTypeRenderersProcessor {
     private var counter = 0
     private val typeRenderers: MutableList<HandlerWithInfo> = mutableListOf()
 
@@ -35,8 +35,20 @@ class TypeRenderersProcessorImpl(
         }
     }
 
+    override fun renderValue(host: ExecutionHost, value: Any?): Any? {
+        return renderResult(host, FieldValue(value, null))
+    }
+
     override fun register(renderer: RendererTypeHandler): Code? {
-        if (renderer !is PrecompiledRendererTypeHandler || !renderer.mayBePrecompiled) {
+        return register(renderer, true)
+    }
+
+    override fun registerWithoutOptimizing(renderer: RendererTypeHandler) {
+        register(renderer, false)
+    }
+
+    private fun register(renderer: RendererTypeHandler, doOptimization: Boolean): Code? {
+        if (!doOptimization || renderer !is PrecompiledRendererTypeHandler || !renderer.mayBePrecompiled) {
             typeRenderers.add(HandlerWithInfo(renderer, null))
             return null
         }

src/main/kotlin/org/jetbrains/kotlinx/jupyter/repl.kt

@@ -17,7 +17,7 @@ import org.jetbrains.kotlinx.jupyter.codegen.FieldsProcessor
 import org.jetbrains.kotlinx.jupyter.codegen.FieldsProcessorImpl
 import org.jetbrains.kotlinx.jupyter.codegen.FileAnnotationsProcessor
 import org.jetbrains.kotlinx.jupyter.codegen.FileAnnotationsProcessorImpl
-import org.jetbrains.kotlinx.jupyter.codegen.TypeRenderersProcessor
+import org.jetbrains.kotlinx.jupyter.codegen.ResultsTypeRenderersProcessor
 import org.jetbrains.kotlinx.jupyter.codegen.TypeRenderersProcessorImpl
 import org.jetbrains.kotlinx.jupyter.common.looksLikeReplCommand
 import org.jetbrains.kotlinx.jupyter.compiler.CompilerArgsConfigurator
@@ -307,7 +307,11 @@ class ReplForJupyterImpl(
         executedCodeLogging != ExecutedCodeLogging.Off
     )
 
-    private val typeRenderersProcessor: TypeRenderersProcessor = TypeRenderersProcessorImpl(contextUpdater)
+    private val typeRenderersProcessor: ResultsTypeRenderersProcessor = run {
+        val processor = TypeRenderersProcessorImpl(contextUpdater)
+        notebook.typeRenderersProcessor = processor
+        processor
+    }
 
     private val fieldsProcessor: FieldsProcessor = FieldsProcessorImpl(contextUpdater)
 
@@ -421,11 +425,11 @@ class ReplForJupyterImpl(
         currentClasspath.addAll(newClasspath)
         if (trackClasspath) {
             val sb = StringBuilder()
-            if (newClasspath.count() > 0) {
+            if (newClasspath.isNotEmpty()) {
                 sb.appendLine("${newClasspath.count()} new paths were added to classpath:")
                 newClasspath.sortedBy { it }.forEach { sb.appendLine(it) }
             }
-            if (oldClasspath.count() > 0) {
+            if (oldClasspath.isNotEmpty()) {
                 sb.appendLine("${oldClasspath.count()} resolved paths were already in classpath:")
                 oldClasspath.sortedBy { it }.forEach { sb.appendLine(it) }
             }

src/main/kotlin/org/jetbrains/kotlinx/jupyter/repl/impl/SharedReplContext.kt

@@ -6,7 +6,7 @@ import org.jetbrains.kotlinx.jupyter.api.Notebook
 import org.jetbrains.kotlinx.jupyter.codegen.ClassAnnotationsProcessor
 import org.jetbrains.kotlinx.jupyter.codegen.FieldsProcessor
 import org.jetbrains.kotlinx.jupyter.codegen.FileAnnotationsProcessor
-import org.jetbrains.kotlinx.jupyter.codegen.TypeRenderersProcessor
+import org.jetbrains.kotlinx.jupyter.codegen.ResultsTypeRenderersProcessor
 import org.jetbrains.kotlinx.jupyter.libraries.LibrariesScanner
 import org.jetbrains.kotlinx.jupyter.libraries.LibraryResourcesProcessor
 import org.jetbrains.kotlinx.jupyter.magics.MagicsProcessor
@@ -16,7 +16,7 @@ internal data class SharedReplContext(
     val classAnnotationsProcessor: ClassAnnotationsProcessor,
     val fileAnnotationsProcessor: FileAnnotationsProcessor,
     val fieldsProcessor: FieldsProcessor,
-    val typeRenderersProcessor: TypeRenderersProcessor,
+    val typeRenderersProcessor: ResultsTypeRenderersProcessor,
     val magicsProcessor: MagicsProcessor,
     val resourcesProcessor: LibraryResourcesProcessor,
     val librariesScanner: LibrariesScanner,

src/test/kotlin/org/jetbrains/kotlinx/jupyter/test/repl/IntegrationApiTests.kt

@@ -122,4 +122,23 @@ class IntegrationApiTests {
         assertEquals("1. 420", repl.eval("42.1").resultValue)
         assertEquals("2. 150", repl.eval("15").resultValue)
     }
+
+    @Test
+    fun `rendering processor should work fine`() {
+        val repl = makeRepl()
+        repl.eval(
+            """
+            class A
+            class B(val a: A)
+
+            USE {
+                render<A> { "iA" }
+                renderWithHost<B> { host, value -> "iB: " + notebook!!.renderersProcessor.renderValue(host, value.a) }
+            }
+            """.trimIndent()
+        )
+
+        val result = repl.eval("B(A())")
+        assertEquals("iB: iA", result.resultValue)
+    }
 }

src/test/kotlin/org/jetbrains/kotlinx/jupyter/test/testUtil.kt

@@ -11,6 +11,7 @@ import org.jetbrains.kotlinx.jupyter.api.DisplayResultWithCell
 import org.jetbrains.kotlinx.jupyter.api.JREInfoProvider
 import org.jetbrains.kotlinx.jupyter.api.KotlinKernelVersion
 import org.jetbrains.kotlinx.jupyter.api.Notebook
+import org.jetbrains.kotlinx.jupyter.api.TypeRenderersProcessor
 import org.jetbrains.kotlinx.jupyter.api.libraries.JupyterIntegration
 import org.jetbrains.kotlinx.jupyter.api.libraries.LibraryDefinition
 import org.jetbrains.kotlinx.jupyter.config.defaultRepositories
@@ -59,7 +60,7 @@ fun assertStartsWith(expectedPrefix: String, actual: String) {
 }
 
 fun Collection<Pair<String, String>>.toLibraries(): LibraryResolver {
-    val libJsons = map { it.first to it.second }.toMap()
+    val libJsons = associate { it.first to it.second }
     return getResolverFromNamesMap(parseLibraryDescriptors(libJsons))
 }
 
@@ -163,6 +164,9 @@ object NotebookMock : Notebook {
         get() = defaultRuntimeProperties.version!!
     override val jreInfo: JREInfoProvider
         get() = JavaRuntime
+
+    override val renderersProcessor: TypeRenderersProcessor
+        get() = error("Not supposed to be called")
 }
 
 fun library(builder: JupyterIntegration.Builder.() -> Unit): LibraryDefinition {