From d08591dea709917553c0d6de024820bb29b328fb Mon Sep 17 00:00:00 2001
From: Paweł Marks <pmarks@virtuslab.com>
Date: Tue, 3 Mar 2020 23:38:23 +0100
Subject: Platform dependent hints for renderer

---
 core/src/main/kotlin/pages/ContentNodes.kt         |  16 +++
 .../src/main/kotlin/renderers/DefaultRenderer.kt   |  68 +++++++-----
 .../src/main/kotlin/renderers/html/HtmlRenderer.kt |  58 +++++++---
 .../documentables/PageContentBuilder.kt            |  14 +++
 .../test/kotlin/renderers/RenderingOnlyTestBase.kt |  88 +++++++++++++++
 .../kotlin/renderers/html/GroupWrappingTest.kt     |  97 ++---------------
 .../renderers/html/PlatformDependentHintTest.kt    | 118 +++++++++++++++++++++
 7 files changed, 329 insertions(+), 130 deletions(-)
 create mode 100644 plugins/base/src/test/kotlin/renderers/RenderingOnlyTestBase.kt
 create mode 100644 plugins/base/src/test/kotlin/renderers/html/PlatformDependentHintTest.kt

diff --git a/core/src/main/kotlin/pages/ContentNodes.kt b/core/src/main/kotlin/pages/ContentNodes.kt
index 096afd40..797623e1 100644
--- a/core/src/main/kotlin/pages/ContentNodes.kt
+++ b/core/src/main/kotlin/pages/ContentNodes.kt
@@ -113,6 +113,22 @@ data class ContentGroup(
     override val extras: Set<Extra>
 ) : ContentComposite
 
+data class PlatformHintedContent(
+    val inner: ContentNode,
+    override val platforms: Set<PlatformData>
+): ContentComposite {
+    override val children = listOf(inner)
+
+    override val dci: DCI
+        get() = inner.dci
+
+    override val extras: Set<Extra>
+        get() = inner.extras
+
+    override val style: Set<Style>
+        get() = inner.style
+}
+
 /** All extras */
 interface Extra
 interface Style
diff --git a/plugins/base/src/main/kotlin/renderers/DefaultRenderer.kt b/plugins/base/src/main/kotlin/renderers/DefaultRenderer.kt
index 960a39fd..33be5dfe 100644
--- a/plugins/base/src/main/kotlin/renderers/DefaultRenderer.kt
+++ b/plugins/base/src/main/kotlin/renderers/DefaultRenderer.kt
@@ -22,54 +22,68 @@ abstract class DefaultRenderer<T>(
 
     abstract fun T.buildHeader(level: Int, content: T.() -> Unit)
     abstract fun T.buildLink(address: String, content: T.() -> Unit)
-    abstract fun T.buildList(node: ContentList, pageContext: ContentPage)
+    abstract fun T.buildList(node: ContentList, pageContext: ContentPage, platformRestriction: PlatformData? = null)
     abstract fun T.buildNewLine()
     abstract fun T.buildResource(node: ContentEmbeddedResource, pageContext: ContentPage)
-    abstract fun T.buildTable(node: ContentTable, pageContext: ContentPage)
+    abstract fun T.buildTable(node: ContentTable, pageContext: ContentPage, platformRestriction: PlatformData? = null)
     abstract fun T.buildText(textNode: ContentText)
     abstract fun T.buildNavigation(page: PageNode)
 
     abstract fun buildPage(page: ContentPage, content: (T, ContentPage) -> Unit): String
     abstract fun buildError(node: ContentNode)
 
-    open fun T.buildGroup(node: ContentGroup, pageContext: ContentPage) = wrapGroup(node, pageContext) {
-        node.children.forEach { it.build(this, pageContext) }
-    }
+    open fun T.buildPlatformDependent(content: PlatformHintedContent, pageContext: ContentPage) =
+        buildContentNode(content.inner, pageContext)
+
+    open fun T.buildGroup(node: ContentGroup, pageContext: ContentPage, platformRestriction: PlatformData? = null) =
+        wrapGroup(node, pageContext) { node.children.forEach { it.build(this, pageContext, platformRestriction) } }
 
     open fun T.wrapGroup(node: ContentGroup, pageContext: ContentPage, childrenCallback: T.() -> Unit) =
         childrenCallback()
 
-    open fun T.buildLinkText(nodes: List<ContentNode>, pageContext: ContentPage) {
-        nodes.forEach { it.build(this, pageContext) }
+    open fun T.buildLinkText(
+        nodes: List<ContentNode>,
+        pageContext: ContentPage,
+        platformRestriction: PlatformData? = null
+    ) {
+        nodes.forEach { it.build(this, pageContext, platformRestriction) }
     }
 
     open fun T.buildCode(code: List<ContentNode>, language: String, pageContext: ContentPage) {
         code.forEach { it.build(this, pageContext) }
     }
 
-    open fun T.buildHeader(node: ContentHeader, pageContext: ContentPage) {
-        buildHeader(node.level) { node.children.forEach { it.build(this, pageContext) } }
+    open fun T.buildHeader(node: ContentHeader, pageContext: ContentPage, platformRestriction: PlatformData? = null) {
+        buildHeader(node.level) { node.children.forEach { it.build(this, pageContext, platformRestriction) } }
     }
 
-    open fun ContentNode.build(builder: T, pageContext: ContentPage) =
-        builder.buildContentNode(this, pageContext)
-
-    open fun T.buildContentNode(node: ContentNode, pageContext: ContentPage) {
-        when (node) {
-            is ContentText -> buildText(node)
-            is ContentHeader -> buildHeader(node, pageContext)
-            is ContentCode -> buildCode(node.children, node.language, pageContext)
-            is ContentDRILink -> buildLink(
-                locationProvider.resolve(node.address, node.platforms.toList(), pageContext)
-            ) {
-                buildLinkText(node.children, pageContext)
+    open fun ContentNode.build(builder: T, pageContext: ContentPage, platformRestriction: PlatformData? = null) =
+        builder.buildContentNode(this, pageContext, platformRestriction)
+
+    open fun T.buildContentNode(
+        node: ContentNode,
+        pageContext: ContentPage,
+        platformRestriction: PlatformData? = null
+    ) {
+        if (platformRestriction == null || platformRestriction in node.platforms) {
+            when (node) {
+                is ContentText -> buildText(node)
+                is ContentHeader -> buildHeader(node, pageContext, platformRestriction)
+                is ContentCode -> buildCode(node.children, node.language, pageContext)
+                is ContentDRILink ->
+                    buildLink(locationProvider.resolve(node.address, node.platforms.toList(), pageContext)) {
+                        buildLinkText(node.children, pageContext, platformRestriction)
+                    }
+                is ContentResolvedLink -> buildLink(node.address) {
+                    buildLinkText(node.children, pageContext, platformRestriction)
+                }
+                is ContentEmbeddedResource -> buildResource(node, pageContext)
+                is ContentList -> buildList(node, pageContext, platformRestriction)
+                is ContentTable -> buildTable(node, pageContext, platformRestriction)
+                is ContentGroup -> buildGroup(node, pageContext, platformRestriction)
+                is PlatformHintedContent -> buildPlatformDependent(node, pageContext)
+                else -> buildError(node)
             }
-            is ContentResolvedLink -> buildLink(node.address) { buildLinkText(node.children, pageContext) }
-            is ContentEmbeddedResource -> buildResource(node, pageContext)
-            is ContentList -> buildList(node, pageContext)
-            is ContentTable -> buildTable(node, pageContext)
-            is ContentGroup -> buildGroup(node, pageContext)
-            else -> buildError(node)
         }
     }
 
diff --git a/plugins/base/src/main/kotlin/renderers/html/HtmlRenderer.kt b/plugins/base/src/main/kotlin/renderers/html/HtmlRenderer.kt
index dcd65c21..0dd3b34b 100644
--- a/plugins/base/src/main/kotlin/renderers/html/HtmlRenderer.kt
+++ b/plugins/base/src/main/kotlin/renderers/html/HtmlRenderer.kt
@@ -33,24 +33,46 @@ open class HtmlRenderer(
         else -> childrenCallback()
     }
 
-    override fun FlowContent.buildList(node: ContentList, pageContext: ContentPage) =
-        if (node.ordered) ol {
-            buildListItems(node.children, pageContext)
-        }
-        else ul {
-            buildListItems(node.children, pageContext)
-        }
+    override fun FlowContent.buildPlatformDependent(content: PlatformHintedContent, pageContext: ContentPage) {
+        val distinct = content.platforms.map {
+            it to createHTML(prettyPrint = false).div {
+                buildContentNode(content.inner, pageContext, it)
+            }.drop(5).dropLast(6) // TODO: Find a way to do it without arbitrary trims
+        }.groupBy(Pair<PlatformData, String>::second, Pair<PlatformData, String>::first)
+
+        if (distinct.size == 1)
+            consumer.onTagContentUnsafe { +distinct.keys.single() }
+        else
+            distinct.forEach { text, platforms ->
+                consumer.onTagContentUnsafe { +platforms.joinToString(prefix = "$text [", postfix = "]") { it.name } }
+            }
+    }
+
+    override fun FlowContent.buildList(
+        node: ContentList,
+        pageContext: ContentPage,
+        platformRestriction: PlatformData?
+    ) = if (node.ordered) ol { buildListItems(node.children, pageContext, platformRestriction) }
+    else ul { buildListItems(node.children, pageContext, platformRestriction) }
 
-    open fun OL.buildListItems(items: List<ContentNode>, pageContext: ContentPage) {
+    open fun OL.buildListItems(
+        items: List<ContentNode>,
+        pageContext: ContentPage,
+        platformRestriction: PlatformData? = null
+    ) {
         items.forEach {
             if (it is ContentList)
                 buildList(it, pageContext)
             else
-                li { it.build(this, pageContext) }
+                li { it.build(this, pageContext, platformRestriction) }
         }
     }
 
-    open fun UL.buildListItems(items: List<ContentNode>, pageContext: ContentPage) {
+    open fun UL.buildListItems(
+        items: List<ContentNode>,
+        pageContext: ContentPage,
+        platformRestriction: PlatformData? = null
+    ) {
         items.forEach {
             if (it is ContentList)
                 buildList(it, pageContext)
@@ -73,14 +95,18 @@ open class HtmlRenderer(
         }
     }
 
-    override fun FlowContent.buildTable(node: ContentTable, pageContext: ContentPage) {
+    override fun FlowContent.buildTable(
+        node: ContentTable,
+        pageContext: ContentPage,
+        platformRestriction: PlatformData?
+    ) {
         table {
             thead {
                 node.header.forEach {
                     tr {
                         it.children.forEach {
                             th {
-                                it.build(this@table, pageContext)
+                                it.build(this@table, pageContext, platformRestriction)
                             }
                         }
                     }
@@ -91,7 +117,7 @@ open class HtmlRenderer(
                     tr {
                         it.children.forEach {
                             td {
-                                it.build(this, pageContext)
+                                it.build(this, pageContext, platformRestriction)
                             }
                         }
                     }
@@ -141,7 +167,11 @@ open class HtmlRenderer(
     override fun FlowContent.buildLink(address: String, content: FlowContent.() -> Unit) =
         a(href = address, block = content)
 
-    override fun FlowContent.buildCode(code: List<ContentNode>, language: String, pageContext: ContentPage) {
+    override fun FlowContent.buildCode(
+        code: List<ContentNode>,
+        language: String,
+        pageContext: ContentPage
+    ) {
         buildNewLine()
         code.forEach {
             +((it as? ContentText)?.text ?: run { context.logger.error("Cannot cast $it as ContentText!"); "" })
diff --git a/plugins/base/src/main/kotlin/translators/documentables/PageContentBuilder.kt b/plugins/base/src/main/kotlin/translators/documentables/PageContentBuilder.kt
index eb422920..0c08241f 100644
--- a/plugins/base/src/main/kotlin/translators/documentables/PageContentBuilder.kt
+++ b/plugins/base/src/main/kotlin/translators/documentables/PageContentBuilder.kt
@@ -232,6 +232,20 @@ open class PageContentBuilder(
             block: DocumentableContentBuilder.() -> Unit
         ): ContentGroup = contentFor(dri, platformData, kind, styles, extras, block)
 
+        fun platformDependentHint(
+            dri: DRI = mainDRI,
+            platformData: Set<PlatformData> = mainPlatformData,
+            kind: Kind = ContentKind.Main,
+            styles: Set<Style> = mainStyles,
+            extras: Set<Extra> = mainExtras,
+            block: DocumentableContentBuilder.() -> Unit
+        ) {
+            contents += PlatformHintedContent(
+                buildGroup(dri, platformData, kind, styles, extras, block),
+                platformData
+            )
+        }
+
         protected fun createText(
             text: String,
             kind: Kind,
diff --git a/plugins/base/src/test/kotlin/renderers/RenderingOnlyTestBase.kt b/plugins/base/src/test/kotlin/renderers/RenderingOnlyTestBase.kt
new file mode 100644
index 00000000..9f148369
--- /dev/null
+++ b/plugins/base/src/test/kotlin/renderers/RenderingOnlyTestBase.kt
@@ -0,0 +1,88 @@
+package renderers
+
+import org.jetbrains.dokka.base.DokkaBase
+import org.jetbrains.dokka.base.resolvers.DefaultLocationProviderFactory
+import org.jetbrains.dokka.base.resolvers.LocationProvider
+import org.jetbrains.dokka.base.resolvers.LocationProviderFactory
+import org.jetbrains.dokka.base.signatures.KotlinSignatureProvider
+import org.jetbrains.dokka.base.transformers.pages.comments.CommentsToContentConverter
+import org.jetbrains.dokka.base.translators.documentables.PageContentBuilder
+import org.jetbrains.dokka.links.DRI
+import org.jetbrains.dokka.model.Documentable
+import org.jetbrains.dokka.model.doc.DocTag
+import org.jetbrains.dokka.pages.*
+import org.jetbrains.dokka.testApi.context.MockContext
+import org.jetbrains.dokka.utilities.DokkaConsoleLogger
+import utils.TestOutputWriter
+
+abstract class RenderingOnlyTestBase {
+    val files = TestOutputWriter()
+    val context = MockContext(
+        DokkaBase().outputWriter to { _ -> files },
+        DokkaBase().locationProviderFactory to ::DefaultLocationProviderFactory
+    )
+
+    protected fun linesAfterContentTag() =
+        files.contents.getValue("test-page.html").lines()
+            .dropWhile { !it.contains("""<div id="content">""") }
+            .joinToString(separator = "") { it.trim() }
+
+}
+
+class TestPage(callback: PageContentBuilder.DocumentableContentBuilder.() -> Unit): RootPageNode(), ContentPage {
+    override val dri: Set<DRI> = setOf(DRI.topLevel)
+    override val documentable: Documentable? = null
+    override val embeddedResources: List<String> = emptyList()
+    override val name: String
+        get() = "testPage"
+    override val children: List<PageNode>
+        get() = emptyList()
+
+    override val content: ContentNode = PageContentBuilder(
+        EmptyCommentConverter,
+        KotlinSignatureProvider(EmptyCommentConverter, DokkaConsoleLogger),
+        DokkaConsoleLogger
+    ).contentFor(
+        DRI.topLevel,
+        emptySet(),
+        block = callback
+    )
+
+    override fun modified(
+        name: String,
+        content: ContentNode,
+        dri: Set<DRI>,
+        embeddedResources: List<String>,
+        children: List<PageNode>
+    ) = this
+
+    override fun modified(name: String, children: List<PageNode>) = this
+}
+
+
+internal object EmptyCommentConverter : CommentsToContentConverter {
+    override fun buildContent(
+        docTag: DocTag,
+        dci: DCI,
+        platforms: Set<PlatformData>,
+        styles: Set<Style>,
+        extras: Set<Extra>
+    ): List<ContentNode> = emptyList()
+}
+
+internal object EmptyLocationProviderFactory: LocationProviderFactory {
+    override fun getLocationProvider(pageNode: RootPageNode) = object : LocationProvider {
+        override fun resolve(dri: DRI, platforms: List<PlatformData>, context: PageNode?): String = ""
+
+        override fun resolve(node: PageNode, context: PageNode?, skipExtension: Boolean): String = node.name
+
+        override fun resolveRoot(node: PageNode): String {
+            TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
+        }
+
+        override fun ancestors(node: PageNode): List<PageNode> {
+            TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
+        }
+
+    }
+}
\ No newline at end of file
diff --git a/plugins/base/src/test/kotlin/renderers/html/GroupWrappingTest.kt b/plugins/base/src/test/kotlin/renderers/html/GroupWrappingTest.kt
index 7fac6450..e98b97c0 100644
--- a/plugins/base/src/test/kotlin/renderers/html/GroupWrappingTest.kt
+++ b/plugins/base/src/test/kotlin/renderers/html/GroupWrappingTest.kt
@@ -1,33 +1,16 @@
 package renderers.html
 
-import org.jetbrains.dokka.base.DokkaBase
 import org.jetbrains.dokka.base.renderers.html.HtmlRenderer
-import org.jetbrains.dokka.base.resolvers.DefaultLocationProviderFactory
-import org.jetbrains.dokka.base.resolvers.LocationProvider
-import org.jetbrains.dokka.base.resolvers.LocationProviderFactory
-import org.jetbrains.dokka.base.transformers.pages.comments.CommentsToContentConverter
-import org.jetbrains.dokka.base.translators.documentables.PageContentBuilder
-import org.jetbrains.dokka.links.DRI
-import org.jetbrains.dokka.model.Documentable
-import org.jetbrains.dokka.model.doc.DocTag
-import org.jetbrains.dokka.pages.*
-import org.jetbrains.dokka.testApi.context.MockContext
-import org.jetbrains.dokka.utilities.DokkaConsoleLogger
+import org.jetbrains.dokka.pages.TextStyle
 import org.junit.Test
-import utils.TestOutputWriter
+import renderers.RenderingOnlyTestBase
+import renderers.TestPage
 
-class GroupWrappingTest {
-
-    val files = TestOutputWriter()
-    val context = MockContext(
-        DokkaBase().outputWriter to { _ -> files },
-        DokkaBase().locationProviderFactory to ::DefaultLocationProviderFactory
-    )
+class GroupWrappingTest: RenderingOnlyTestBase() {
 
     @Test
     fun notWrapped() {
-
-        val page = createPage {
+        val page = TestPage {
             group {
                 text("a")
                 text("b")
@@ -42,8 +25,7 @@ class GroupWrappingTest {
 
     @Test
     fun paragraphWrapped() {
-
-        val page = createPage {
+        val page = TestPage {
             group(styles = setOf(TextStyle.Paragraph)) {
                 text("a")
                 text("b")
@@ -58,8 +40,7 @@ class GroupWrappingTest {
 
     @Test
     fun blockWrapped() {
-
-        val page = createPage {
+        val page = TestPage {
             group(styles = setOf(TextStyle.Block)) {
                 text("a")
                 text("b")
@@ -74,8 +55,7 @@ class GroupWrappingTest {
 
     @Test
     fun nested() {
-
-        val page = createPage {
+        val page = TestPage {
             group(styles = setOf(TextStyle.Block)) {
                 text("a")
                 group(styles = setOf(TextStyle.Block)) {
@@ -93,65 +73,4 @@ class GroupWrappingTest {
         assert(linesAfterContentTag().contains("<div>a<div><div>bc</div></div>d</div>"))
     }
 
-    private fun linesAfterContentTag() =
-        files.contents.getValue("test-page.html").lines()
-            .dropWhile { !it.contains("""<div id="content">""") }
-            .joinToString(separator = "") { it.trim() }
 }
-
-// TODO: may be useful for other tests, consider extracting
-private fun createPage(
-    callback: PageContentBuilder.DocumentableContentBuilder.() -> Unit
-) = object : RootPageNode(), ContentPage {
-    override val dri: Set<DRI> = setOf(DRI.topLevel)
-    override val documentable: Documentable? = null
-    override val embeddedResources: List<String> = emptyList()
-    override val name: String
-        get() = "testPage"
-    override val children: List<PageNode>
-        get() = emptyList()
-
-    override val content: ContentNode = PageContentBuilder(EmptyCommentConverter, DokkaConsoleLogger).contentFor(
-        DRI.topLevel,
-        emptySet(),
-        block = callback
-    )
-
-    override fun modified(
-        name: String,
-        content: ContentNode,
-        dri: Set<DRI>,
-        embeddedResources: List<String>,
-        children: List<PageNode>
-    ) = this
-
-    override fun modified(name: String, children: List<PageNode>) = this
-}
-
-private object EmptyCommentConverter : CommentsToContentConverter {
-    override fun buildContent(
-        docTag: DocTag,
-        dci: DCI,
-        platforms: Set<PlatformData>,
-        styles: Set<Style>,
-        extras: Set<Extra>
-    ): List<ContentNode> = emptyList()
-}
-
-private object EmptyLocationProviderFactory: LocationProviderFactory {
-    override fun getLocationProvider(pageNode: RootPageNode) = object : LocationProvider {
-        override fun resolve(dri: DRI, platforms: List<PlatformData>, context: PageNode?): String = ""
-
-        override fun resolve(node: PageNode, context: PageNode?, skipExtension: Boolean): String = node.name
-
-        override fun resolveRoot(node: PageNode): String {
-            TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
-        }
-
-        override fun ancestors(node: PageNode): List<PageNode> {
-            TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
-        }
-
-    }
-
-}
\ No newline at end of file
diff --git a/plugins/base/src/test/kotlin/renderers/html/PlatformDependentHintTest.kt b/plugins/base/src/test/kotlin/renderers/html/PlatformDependentHintTest.kt
new file mode 100644
index 00000000..2fda1ee1
--- /dev/null
+++ b/plugins/base/src/test/kotlin/renderers/html/PlatformDependentHintTest.kt
@@ -0,0 +1,118 @@
+package renderers.html
+
+import org.jetbrains.dokka.Platform
+import org.jetbrains.dokka.base.renderers.html.HtmlRenderer
+import org.jetbrains.dokka.pages.PlatformData
+import org.jetbrains.dokka.pages.Style
+import org.jetbrains.dokka.pages.TextStyle
+import org.junit.Test
+import renderers.RenderingOnlyTestBase
+import renderers.TestPage
+
+class PlatformDependentHintTest: RenderingOnlyTestBase() {
+    private val pl1 = PlatformData("pl1", Platform.js, listOf("pl1"))
+    private val pl2 = PlatformData("pl2", Platform.jvm, listOf("pl2"))
+    private val pl3 = PlatformData("pl3", Platform.native, listOf("pl3"))
+
+    @Test
+    fun platformIndependentCase() {
+        val page = TestPage {
+            platformDependentHint(platformData = setOf(pl1, pl2, pl3), styles = setOf(TextStyle.Block)) {
+                text("a")
+                text("b")
+                text("c")
+            }
+        }
+
+        HtmlRenderer(context).render(page)
+        assert(linesAfterContentTag().contains("<div>abc</div></div>"))
+    }
+
+    @Test
+    fun completelyDivergentCase() {
+        val page = TestPage {
+            platformDependentHint(platformData = setOf(pl1, pl2, pl3), styles = setOf(TextStyle.Block)) {
+                text("a", platformData = setOf(pl1))
+                text("b", platformData = setOf(pl2))
+                text("c", platformData = setOf(pl3))
+            }
+        }
+
+        HtmlRenderer(context).render(page)
+        assert(linesAfterContentTag().contains("<div>a</div> [pl1]<div>b</div> [pl2]<div>c</div> [pl3]</div>"))
+    }
+
+    @Test
+    fun overlappingCase() {
+        val page = TestPage {
+            platformDependentHint(platformData = setOf(pl1, pl2), styles = setOf(TextStyle.Block)) {
+                text("a", platformData = setOf(pl1))
+                text("b", platformData = setOf(pl1, pl2))
+                text("c", platformData = setOf(pl2))
+            }
+        }
+
+        HtmlRenderer(context).render(page)
+        assert(linesAfterContentTag().contains("<div>ab</div> [pl1]<div>bc</div> [pl2]</div>"))
+    }
+
+    @Test
+    fun caseThatCanBeSimplified() {
+        val page = TestPage {
+            platformDependentHint(platformData = setOf(pl1, pl2), styles = setOf(TextStyle.Block)) {
+                text("a", platformData = setOf(pl1, pl2))
+                text("b", platformData = setOf(pl1))
+                text("b", platformData = setOf(pl2))
+            }
+        }
+
+        HtmlRenderer(context).render(page)
+        assert(linesAfterContentTag().contains("<div>ab</div></div>"))
+    }
+
+    @Test
+    fun caseWithGroupBreakingSimplification() {
+        val page = TestPage {
+            platformDependentHint(platformData = setOf(pl1, pl2), styles = setOf(TextStyle.Block)) {
+                group(styles = setOf(TextStyle.Block)) {
+                    text("a", platformData = setOf(pl1, pl2))
+                    text("b", platformData = setOf(pl1))
+                }
+                text("b", platformData = setOf(pl2))
+            }
+        }
+
+        HtmlRenderer(context).render(page)
+        assert(linesAfterContentTag().contains("<div><div>ab</div></div> [pl1]<div><div>a</div>b</div> [pl2]</div>"))
+    }
+
+    @Test
+    fun caseWithGroupNotBreakingSimplification() {
+        val page = TestPage {
+            platformDependentHint(platformData = setOf(pl1, pl2), styles = setOf(TextStyle.Block)) {
+                group {
+                    text("a", platformData = setOf(pl1, pl2))
+                    text("b", platformData = setOf(pl1))
+                }
+                text("b", platformData = setOf(pl2))
+            }
+        }
+
+        HtmlRenderer(context).render(page)
+        assert(linesAfterContentTag().contains("<div>ab</div></div>"))
+    }
+
+    @Test
+    fun partiallyUnifiedCase() {
+        val page = TestPage {
+            platformDependentHint(platformData = setOf(pl1, pl2, pl3), styles = setOf(TextStyle.Block)) {
+                text("a", platformData = setOf(pl1))
+                text("a", platformData = setOf(pl2))
+                text("b", platformData = setOf(pl3))
+            }
+        }
+
+        HtmlRenderer(context).render(page)
+        assert(linesAfterContentTag().contains("<div>a</div> [pl1, pl2]<div>b</div> [pl3]</div>"))
+    }
+}
\ No newline at end of file
-- 
cgit