Add ability to clear or toggle formatting.

app/src/test/java/org/thoughtcrime/securesms/conversation/MessageStylerTest.kt

@@ -0,0 +1,210 @@
+/*
+ * Copyright 2023 Signal Messenger, LLC
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+package org.thoughtcrime.securesms.conversation
+
+import android.app.Application
+import android.text.Spannable
+import android.text.SpannableString
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.robolectric.RobolectricTestRunner
+import org.robolectric.annotation.Config
+import org.thoughtcrime.securesms.assertIs
+import org.thoughtcrime.securesms.assertIsNull
+import org.thoughtcrime.securesms.database.model.databaseprotos.BodyRangeList.BodyRange.Style
+
+@RunWith(RobolectricTestRunner::class)
+@Config(manifest = Config.NONE, application = Application::class)
+class MessageStylerTest {
+
+  private lateinit var text: Spannable
+
+  @Before
+  fun setUp() {
+    text = SpannableString("This is a really long string for testing. Also thank you to all our beta testers!")
+  }
+
+  @Test
+  fun nonOverlappingDifferentStyles() {
+    MessageStyler.toggleStyle(Style.BOLD, text, 0, 5)
+    MessageStyler.toggleStyle(Style.ITALIC, text, 10, 15)
+
+    val bodyRange = MessageStyler.getStyling(text)!!
+
+    bodyRange.rangesCount assertIs 2
+
+    bodyRange.rangesList[0].apply {
+      style assertIs Style.BOLD
+      start assertIs 0
+      length assertIs 5
+    }
+
+    bodyRange.rangesList[1].apply {
+      style assertIs Style.ITALIC
+      start assertIs 10
+      length assertIs 5
+    }
+  }
+
+  @Test
+  fun overlappingDifferentStyles() {
+    MessageStyler.toggleStyle(Style.BOLD, text, 0, 5)
+    MessageStyler.toggleStyle(Style.ITALIC, text, 3, 10)
+
+    val bodyRange = MessageStyler.getStyling(text)!!
+
+    bodyRange.rangesCount assertIs 2
+
+    bodyRange.rangesList[0].apply {
+      style assertIs Style.BOLD
+      start assertIs 0
+      length assertIs 5
+    }
+
+    bodyRange.rangesList[1].apply {
+      style assertIs Style.ITALIC
+      start assertIs 3
+      length assertIs 7
+    }
+  }
+
+  @Test
+  fun overlappingBeginning() {
+    MessageStyler.toggleStyle(Style.BOLD, text, 3, 10)
+    MessageStyler.toggleStyle(Style.BOLD, text, 0, 5)
+
+    val bodyRange = MessageStyler.getStyling(text)!!
+
+    bodyRange.rangesCount assertIs 1
+
+    bodyRange.rangesList[0].apply {
+      style assertIs Style.BOLD
+      start assertIs 0
+      length assertIs 10
+    }
+  }
+
+  @Test
+  fun overlappingEnd() {
+    MessageStyler.toggleStyle(Style.BOLD, text, 0, 5)
+    MessageStyler.toggleStyle(Style.BOLD, text, 3, 10)
+
+    val bodyRange = MessageStyler.getStyling(text)!!
+
+    bodyRange.rangesCount assertIs 1
+
+    bodyRange.rangesList[0].apply {
+      style assertIs Style.BOLD
+      start assertIs 0
+      length assertIs 10
+    }
+  }
+
+  @Test
+  fun overlappingContained() {
+    MessageStyler.toggleStyle(Style.BOLD, text, 0, 10)
+    MessageStyler.toggleStyle(Style.BOLD, text, 4, 6)
+
+    val bodyRange = MessageStyler.getStyling(text)!!
+
+    bodyRange.rangesCount assertIs 2
+
+    bodyRange.rangesList[0].apply {
+      style assertIs Style.BOLD
+      start assertIs 0
+      length assertIs 4
+    }
+
+    bodyRange.rangesList[1].apply {
+      style assertIs Style.BOLD
+      start assertIs 6
+      length assertIs 4
+    }
+  }
+
+  @Test
+  fun overlappingCovering() {
+    MessageStyler.toggleStyle(Style.BOLD, text, 4, 6)
+    MessageStyler.toggleStyle(Style.BOLD, text, 0, 10)
+
+    val bodyRange = MessageStyler.getStyling(text)!!
+
+    bodyRange.rangesCount assertIs 1
+
+    bodyRange.rangesList[0].apply {
+      style assertIs Style.BOLD
+      start assertIs 0
+      length assertIs 10
+    }
+  }
+
+  @Test
+  fun overlappingExact() {
+    MessageStyler.toggleStyle(Style.BOLD, text, 4, 6)
+    MessageStyler.toggleStyle(Style.BOLD, text, 4, 6)
+
+    val bodyRange = MessageStyler.getStyling(text)
+
+    bodyRange.assertIsNull()
+  }
+
+  @Test
+  fun overlappingCoveringMultiple() {
+    MessageStyler.toggleStyle(Style.BOLD, text, 0, 3)
+    MessageStyler.toggleStyle(Style.BOLD, text, 6, 8)
+    MessageStyler.toggleStyle(Style.BOLD, text, 0, 10)
+
+    val bodyRange = MessageStyler.getStyling(text)!!
+
+    bodyRange.rangesCount assertIs 1
+
+    bodyRange.rangesList[0].apply {
+      style assertIs Style.BOLD
+      start assertIs 0
+      length assertIs 10
+    }
+  }
+
+  @Test
+  fun overlappingEndAndBeginning() {
+    MessageStyler.toggleStyle(Style.BOLD, text, 0, 3)
+    MessageStyler.toggleStyle(Style.BOLD, text, 6, 8)
+    MessageStyler.toggleStyle(Style.BOLD, text, 2, 7)
+
+    val bodyRange = MessageStyler.getStyling(text)!!
+
+    bodyRange.rangesCount assertIs 1
+
+    bodyRange.rangesList[0].apply {
+      style assertIs Style.BOLD
+      start assertIs 0
+      length assertIs 8
+    }
+  }
+
+  @Test
+  fun clearFormatting() {
+    MessageStyler.toggleStyle(Style.BOLD, text, 0, 10)
+    MessageStyler.clearStyling(text, 3, 7)
+
+    val bodyRange = MessageStyler.getStyling(text)!!
+
+    bodyRange.rangesCount assertIs 2
+
+    bodyRange.rangesList[0].apply {
+      style assertIs Style.BOLD
+      start assertIs 0
+      length assertIs 3
+    }
+
+    bodyRange.rangesList[1].apply {
+      style assertIs Style.BOLD
+      start assertIs 7
+      length assertIs 3
+    }
+  }
+}