Improve performance of toHtml method by moving it to background thread

Author: planarvoid

aztec/build.gradle

@@ -59,10 +59,11 @@ dependencies {
 
     testImplementation "junit:junit:$jUnitVersion"
     testImplementation "org.robolectric:robolectric:$robolectricVersion"
-    testImplementation 'androidx.test:core:1.4.0'
+    testImplementation 'androidx.test:core:1.6.1'
 
     implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:$kotlinCoroutinesVersion"
     implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:$kotlinCoroutinesVersion"
+    testImplementation "org.jetbrains.kotlinx:kotlinx-coroutines-test:$kotlinCoroutinesVersion"
 
     implementation 'org.apache.commons:commons-lang3:3.8.1'
 

aztec/src/main/kotlin/org/wordpress/aztec/Aztec.kt

@@ -78,7 +78,7 @@ open class Aztec private constructor(
         }
 
         @JvmStatic
-        fun with(visualEditor: AztecText, toolbar: AztecToolbar, toolbarClickListener: IAztecToolbarClickListener): Aztec {
+        fun with(visualEditor: AztecText, toolbar: IAztecToolbar, toolbarClickListener: IAztecToolbarClickListener): Aztec {
             return Aztec(visualEditor, null, toolbar, toolbarClickListener)
         }
     }

aztec/src/main/kotlin/org/wordpress/aztec/AztecText.kt

@@ -429,6 +429,24 @@ open class AztecText : AppCompatEditText, TextWatcher, UnknownHtmlSpan.OnUnknown
         return super.getText()!!
     }
 
+    /**
+     * The getText method returns mutable version of the content. This means that it can change
+     * when being worked on. Call this method when you want your Editable to be immutable.
+     */
+    fun getTextCopy(): Editable {
+        val copy = SpannableStringBuilder(text.toString())
+
+        val spans: Array<Any> = text.getSpans(0, text.length, Any::class.java)
+
+        for (span in spans) {
+            val spanStart = text.getSpanStart(span)
+            val spanEnd = text.getSpanEnd(span)
+            val flags = text.getSpanFlags(span)
+            copy.setSpan(span, spanStart, spanEnd, flags)
+        }
+        return copy
+    }
+
     @SuppressLint("ResourceType")
     private fun init(attrs: AttributeSet?) {
         disableTextChangedListener()
@@ -1631,6 +1649,10 @@ open class AztecText : AppCompatEditText, TextWatcher, UnknownHtmlSpan.OnUnknown
         return toHtml(text, withCursorTag)
     }
 
+    suspend fun toHtmlAsync(withCursorTag: Boolean = false): String {
+        return toHtmlAsync(getTextCopy(), withCursorTag)
+    }
+
     // general function accepts any Spannable and converts it to regular or "calypso" html
     // depending on the mode
     fun toHtml(content: Spannable, withCursorTag: Boolean = false): String {
@@ -1645,6 +1667,10 @@ open class AztecText : AppCompatEditText, TextWatcher, UnknownHtmlSpan.OnUnknown
         }
     }
 
+    suspend fun toHtmlAsync(content: Editable, withCursorTag: Boolean = false): String {
+        return toPlainHtmlAsync(content, withCursorTag)
+    }
+
     // platform agnostic HTML
     // default behavior returns HTML from this text
     fun toPlainHtml(withCursorTag: Boolean = false): String {
@@ -1664,6 +1690,12 @@ open class AztecText : AppCompatEditText, TextWatcher, UnknownHtmlSpan.OnUnknown
         }
     }
 
+    suspend fun toPlainHtmlAsync(content: Editable, withCursorTag: Boolean = false): String {
+        return withContext(Dispatchers.Default) {
+            parseHtml(content, withCursorTag)
+        }
+    }
+
     private fun parseHtml(content: Spannable, withCursorTag: Boolean): String {
         val parser = AztecParser(alignmentRendering, plugins)
         val output: SpannableStringBuilder

aztec/src/test/kotlin/org/wordpress/aztec/AsyncAztecTest.kt

@@ -0,0 +1,105 @@
+package org.wordpress.aztec
+
+import android.app.Activity
+import android.view.MenuItem
+import android.widget.PopupMenu
+import android.widget.ToggleButton
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.test.runTest
+import org.junit.Assert
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.robolectric.Robolectric
+import org.robolectric.RobolectricTestRunner
+import org.wordpress.aztec.source.SourceViewEditText
+import org.wordpress.aztec.toolbar.AztecToolbar
+import org.wordpress.aztec.toolbar.ToolbarAction
+import org.wordpress.aztec.toolbar.ToolbarItems
+
+@RunWith(RobolectricTestRunner::class)
+class AsyncAztecTest {
+    lateinit var editText: AztecText
+    lateinit var sourceText: SourceViewEditText
+    lateinit var toolbar: AztecToolbar
+    lateinit var buttonQuote: ToggleButton
+    lateinit var menuHeading: PopupMenu
+    lateinit var menuHeading1: MenuItem
+    lateinit var menuHeading2: MenuItem
+    lateinit var menuParagraph: MenuItem
+    lateinit var buttonPreformat: ToggleButton
+    lateinit var buttonBold: ToggleButton
+
+    /**
+     * Initialize variables.
+     */
+    @Before
+    fun init() {
+        val activity = Robolectric.buildActivity(Activity::class.java).create().visible().get()
+        editText = AztecText(activity)
+        editText.setCalypsoMode(false)
+        sourceText = SourceViewEditText(activity)
+        sourceText.setCalypsoMode(false)
+        toolbar = AztecToolbar(activity)
+        toolbar.setToolbarItems(
+            ToolbarItems.BasicLayout(
+            ToolbarAction.HEADING,
+            ToolbarAction.PREFORMAT,
+            ToolbarAction.LIST,
+            ToolbarAction.QUOTE,
+            ToolbarAction.BOLD,
+            ToolbarAction.ITALIC,
+            ToolbarAction.LINK,
+            ToolbarAction.UNDERLINE,
+            ToolbarAction.STRIKETHROUGH,
+            ToolbarAction.ALIGN_LEFT,
+            ToolbarAction.ALIGN_CENTER,
+            ToolbarAction.ALIGN_RIGHT,
+            ToolbarAction.HORIZONTAL_RULE,
+            ToolbarAction.HTML
+        ))
+        toolbar.setEditor(editText, sourceText)
+        buttonQuote = toolbar.findViewById<ToggleButton>(R.id.format_bar_button_quote)
+        menuHeading = toolbar.getHeadingMenu() as PopupMenu
+        menuHeading1 = menuHeading.menu.getItem(1)
+        menuHeading2 = menuHeading.menu.getItem(2)
+        menuParagraph = menuHeading.menu.getItem(0)
+        buttonPreformat = toolbar.findViewById<ToggleButton>(R.id.format_bar_button_pre)
+        buttonBold = toolbar.findViewById<ToggleButton>(R.id.format_bar_button_bold)
+        activity.setContentView(editText)
+    }
+
+    @Test
+    @Throws(Exception::class)
+    fun asyncToHtmlWorksOnCurrentVersion() = runTest {
+        editText.append("One two three")
+        val textCopy = editText.getTextCopy()
+        Assert.assertEquals("One two three", editText.toHtmlAsync(textCopy))
+        val jobs = mutableListOf<Job>()
+        jobs.add(launch {
+            Assert.assertEquals("One two three", editText.toHtmlAsync(textCopy))
+        })
+        toolbar.onMenuItemClick(menuHeading1)
+        val textCopy2 = editText.getTextCopy()
+        jobs.add(launch {
+            Assert.assertEquals("<h1>One two three</h1>", editText.toHtmlAsync(textCopy2))
+        })
+        toolbar.onMenuItemClick(menuParagraph)
+        val textCopy3 = editText.getTextCopy()
+        jobs.add(launch {
+            Assert.assertEquals("One two three", editText.toHtmlAsync(textCopy3))
+        })
+        val from = editText.editableText.indexOf("two")
+        editText.setSelection(from, from + 3)
+        editText.toggleFormatting(AztecTextFormat.FORMAT_BOLD)
+        val textCopy4 = editText.getTextCopy()
+        jobs.add(launch {
+            Assert.assertEquals("One <strong>two</strong> three", editText.toHtmlAsync(textCopy4))
+        })
+        jobs.forEach {
+            it.join()
+            Assert.assertTrue(it.isCompleted)
+        }
+    }
+}

build.gradle

@@ -73,12 +73,12 @@ ext {
 ext {
     // mixed
     gradlePluginVersion = '3.3.1'
-    kotlinCoroutinesVersion = '1.6.4'
+    kotlinCoroutinesVersion = '1.8.1'
     tagSoupVersion = '1.2.1'
     glideVersion = '4.10.0'
     picassoVersion = '2.5.2'
-    robolectricVersion = '4.11'
-    jUnitVersion = '4.12'
+    robolectricVersion = '4.13'
+    jUnitVersion = '4.13.2'
     jSoupVersion = '1.15.3'
     wordpressUtilsVersion = '3.5.0'
     espressoVersion = '3.0.1'

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.2.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.8-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME

settings.gradle

@@ -1,6 +1,6 @@
 pluginManagement {
     gradle.ext.kotlinVersion = '1.9.24'
-    gradle.ext.agpVersion = '8.1.0'
+    gradle.ext.agpVersion = '8.5.0'
     gradle.ext.automatticPublishToS3Version = '0.8.0'
     gradle.ext.dependencyAnalysisVersion = '1.33.0'