Improve editor

app-sample/src/main/java/io/noties/markwon/app/samples/editor/EditorHeadingSample.java

@@ -5,7 +5,7 @@
 import io.noties.markwon.Markwon;
 import io.noties.markwon.app.sample.Tags;
 import io.noties.markwon.app.samples.editor.shared.MarkwonEditTextSample;
-import io.noties.markwon.app.samples.editor.shared.HeadingEditHandler;
+import io.noties.markwon.editor.handler.HeadingEditHandler;
 import io.noties.markwon.editor.MarkwonEditor;
 import io.noties.markwon.editor.MarkwonEditorTextWatcher;
 import io.noties.markwon.sample.annotations.MarkwonArtifact;

app-sample/src/main/java/io/noties/markwon/app/samples/editor/EditorMultipleEditSpansSample.java

@@ -22,6 +22,7 @@
 import io.noties.markwon.editor.MarkwonEditorTextWatcher;
 import io.noties.markwon.editor.handler.EmphasisEditHandler;
 import io.noties.markwon.editor.handler.StrongEmphasisEditHandler;
+import io.noties.markwon.editor.handler.CodeBlockEditHandler;
 import io.noties.markwon.ext.strikethrough.StrikethroughPlugin;
 import io.noties.markwon.inlineparser.BangInlineProcessor;
 import io.noties.markwon.inlineparser.EntityInlineProcessor;
@@ -76,6 +77,7 @@ public void configureParser(@NonNull Parser.Builder builder) {
       .useEditHandler(new EmphasisEditHandler())
       .useEditHandler(new StrongEmphasisEditHandler())
       .useEditHandler(new StrikethroughEditHandler())
+      .useEditHandler(new CodeBlockEditHandler())
       .useEditHandler(new CodeEditHandler())
       .useEditHandler(new BlockQuoteEditHandler())
       .useEditHandler(new LinkEditHandler(onClick))

app-sample/src/main/java/io/noties/markwon/app/samples/editor/WYSIWYGEditorSample.java

@@ -15,14 +15,14 @@
 import io.noties.markwon.app.sample.Tags;
 import io.noties.markwon.app.samples.editor.shared.BlockQuoteEditHandler;
 import io.noties.markwon.app.samples.editor.shared.CodeEditHandler;
-import io.noties.markwon.app.samples.editor.shared.HeadingEditHandler;
 import io.noties.markwon.app.samples.editor.shared.LinkEditHandler;
 import io.noties.markwon.app.samples.editor.shared.MarkwonEditTextSample;
 import io.noties.markwon.app.samples.editor.shared.StrikethroughEditHandler;
 import io.noties.markwon.editor.MarkwonEditor;
 import io.noties.markwon.editor.MarkwonEditorTextWatcher;
 import io.noties.markwon.editor.PersistedSpans;
 import io.noties.markwon.editor.handler.EmphasisEditHandler;
+import io.noties.markwon.editor.handler.HeadingEditHandler;
 import io.noties.markwon.editor.handler.StrongEmphasisEditHandler;
 import io.noties.markwon.sample.annotations.MarkwonArtifact;
 import io.noties.markwon.sample.annotations.MarkwonSampleInfo;

markwon-editor/build.gradle

@@ -11,6 +11,11 @@ android {
         versionCode 1
         versionName version
     }
+
+    compileOptions {
+        targetCompatibility JavaVersion.VERSION_1_8
+        sourceCompatibility JavaVersion.VERSION_1_8
+    }
 }
 
 dependencies {

markwon-editor/src/main/java/io/noties/markwon/editor/handler/CodeBlockEditHandler.java

@@ -0,0 +1,47 @@
+package io.noties.markwon.editor.handler;
+
+import android.text.Editable;
+import android.text.Spanned;
+
+import androidx.annotation.NonNull;
+
+import io.noties.markwon.Markwon;
+import io.noties.markwon.core.MarkwonTheme;
+import io.noties.markwon.core.spans.CodeBlockSpan;
+import io.noties.markwon.editor.EditHandler;
+import io.noties.markwon.editor.MarkwonEditorUtils;
+import io.noties.markwon.editor.PersistedSpans;
+
+public class CodeBlockEditHandler implements EditHandler<CodeBlockSpan> {
+    private MarkwonTheme theme;
+
+    @Override
+    public void init(@NonNull Markwon markwon) {
+        theme = markwon.configuration().theme();
+    }
+
+    @Override
+    public void configurePersistedSpans(@NonNull PersistedSpans.Builder builder) {
+        builder.persistSpan(CodeBlockSpan.class, () -> new CodeBlockSpan(theme));
+    }
+
+    @Override
+    public void handleMarkdownSpan(@NonNull PersistedSpans persistedSpans, @NonNull Editable editable, @NonNull String input, @NonNull CodeBlockSpan span, int spanStart, int spanTextLength) {
+        MarkwonEditorUtils.Match delimited = MarkwonEditorUtils.findDelimited(input, spanStart, "```");
+        if (delimited != null) {
+            editable.setSpan(
+                    persistedSpans.get(markdownSpanType()),
+                    delimited.start(),
+                    delimited.end(),
+                    Spanned.SPAN_EXCLUSIVE_EXCLUSIVE
+
+            );
+        }
+    }
+
+    @NonNull
+    @Override
+    public Class<CodeBlockSpan> markdownSpanType() {
+        return CodeBlockSpan.class;
+    }
+}

markwon-editor/src/main/java/io/noties/markwon/editor/handler/HeadingEditHandler.java

@@ -0,0 +1,142 @@
+package io.noties.markwon.editor.handler;
+
+import android.text.Editable;
+import android.text.Spanned;
+
+import androidx.annotation.NonNull;
+
+import io.noties.markwon.Markwon;
+import io.noties.markwon.core.MarkwonTheme;
+import io.noties.markwon.core.spans.HeadingSpan;
+import io.noties.markwon.editor.EditHandler;
+import io.noties.markwon.editor.PersistedSpans;
+
+public class HeadingEditHandler implements EditHandler<HeadingSpan> {
+
+  private MarkwonTheme theme;
+
+  @Override
+  public void init(@NonNull Markwon markwon) {
+    this.theme = markwon.configuration().theme();
+  }
+
+  @Override
+  public void configurePersistedSpans(@NonNull PersistedSpans.Builder builder) {
+    builder.persistSpan(Heading1Span.class, () -> new Heading1Span(theme));
+    builder.persistSpan(Heading2Span.class, () -> new Heading2Span(theme));
+    builder.persistSpan(Heading3Span.class, () -> new Heading3Span(theme));
+    builder.persistSpan(Heading4Span.class, () -> new Heading4Span(theme));
+    builder.persistSpan(Heading5Span.class, () -> new Heading5Span(theme));
+    builder.persistSpan(Heading6Span.class, () -> new Heading6Span(theme));
+  }
+
+  @Override
+  public void handleMarkdownSpan(
+          @NonNull PersistedSpans persistedSpans,
+          @NonNull Editable editable,
+          @NonNull String input,
+          @NonNull HeadingSpan span,
+          int spanStart,
+          int spanTextLength) {
+    final HeadingSpan newSpan;
+
+    switch (span.getLevel()) {
+      case 1:
+        newSpan = persistedSpans.get(Heading1Span.class);
+        break;
+      case 2:
+        newSpan = persistedSpans.get(Heading2Span.class);
+        break;
+      case 3:
+        newSpan = persistedSpans.get(Heading3Span.class);
+        break;
+      case 4:
+        newSpan = persistedSpans.get(Heading4Span.class);
+        break;
+      case 5:
+        newSpan = persistedSpans.get(Heading5Span.class);
+        break;
+      case 6:
+        newSpan = persistedSpans.get(Heading6Span.class);
+        break;
+      default:
+        return;
+
+    }
+    final int newStart = getNewSpanStart(input, spanStart);
+    final int newEnd = findEnd(input, newStart, newSpan.getLevel());
+
+    editable.setSpan(
+            newSpan,
+            newStart,
+            newEnd,
+            Spanned.SPAN_EXCLUSIVE_EXCLUSIVE
+    );
+  }
+
+  private int findEnd(String input, int searchFrom, int spanLevel) {
+    int end = searchFrom + spanLevel;
+    final int strLength = input.length();
+    while (end < strLength - 1) {
+      end++;
+      if (input.charAt(end) == '\n') {
+        break;
+      }
+    }
+    return end + 1;
+  }
+
+  private int getNewSpanStart(String input, int spanStart) {
+    int start = spanStart;
+
+    while (start >= 0 && input.charAt(start) != '\n') {
+      start--;
+    }
+    start += 1;
+
+    return start;
+  }
+
+
+  @NonNull
+  @Override
+  public Class<HeadingSpan> markdownSpanType() {
+    return HeadingSpan.class;
+  }
+
+  private static class Heading1Span extends HeadingSpan {
+    public Heading1Span(@NonNull MarkwonTheme theme) {
+      super(theme, 1);
+    }
+  }
+
+  private static class Heading2Span extends HeadingSpan {
+    public Heading2Span(@NonNull MarkwonTheme theme) {
+      super(theme, 2);
+    }
+  }
+
+  private static class Heading3Span extends HeadingSpan {
+    public Heading3Span(@NonNull MarkwonTheme theme) {
+      super(theme, 3);
+    }
+  }
+
+  private static class Heading4Span extends HeadingSpan {
+    public Heading4Span(@NonNull MarkwonTheme theme) {
+      super(theme, 4);
+    }
+  }
+
+  private static class Heading5Span extends HeadingSpan {
+    public Heading5Span(@NonNull MarkwonTheme theme) {
+      super(theme, 5);
+    }
+  }
+
+  private static class Heading6Span extends HeadingSpan {
+    public Heading6Span(@NonNull MarkwonTheme theme) {
+      super(theme, 6);
+    }
+  }
+}