Added detect HTML

ATTRIBUTION.md

@@ -46,3 +46,4 @@ FairEmail uses:
 * [IPAddress](https://github.com/seancfoley/IPAddress). Copyright 2016-2018 Sean C Foley. [Apache License 2.0](https://github.com/seancfoley/IPAddress/blob/master/LICENSE).
 * [MaterialDings](https://github.com/Accusoft/MaterialDings). Copyright (c) 2018 Accusoft Corporation. [MIT License](https://github.com/Accusoft/MaterialDings/blob/master/LICENSE.md).
 * [Send](https://github.com/timvisee/send). [Mozilla Public License 2.0](https://github.com/timvisee/send/blob/master/LICENSE).
+* [DetectHtml](https://github.com/dbennett455/DetectHtml). [The MIT License](https://github.com/dbennett455/DetectHtml/blob/master/LICENSE).

app/src/main/assets/ATTRIBUTION.md

@@ -46,3 +46,4 @@ FairEmail uses:
 * [IPAddress](https://github.com/seancfoley/IPAddress). Copyright 2016-2018 Sean C Foley. [Apache License 2.0](https://github.com/seancfoley/IPAddress/blob/master/LICENSE).
 * [MaterialDings](https://github.com/Accusoft/MaterialDings). Copyright (c) 2018 Accusoft Corporation. [MIT License](https://github.com/Accusoft/MaterialDings/blob/master/LICENSE.md).
 * [Send](https://github.com/timvisee/send). [Mozilla Public License 2.0](https://github.com/timvisee/send/blob/master/LICENSE).
+* [DetectHtml](https://github.com/dbennett455/DetectHtml). [The MIT License](https://github.com/dbennett455/DetectHtml/blob/master/LICENSE).

app/src/main/java/eu/faircode/email/EditTextCompose.java

@@ -55,6 +55,7 @@ import androidx.core.view.inputmethod.InputConnectionCompat;
 import androidx.core.view.inputmethod.InputContentInfoCompat;
 import androidx.preference.PreferenceManager;
 
+import org.github.DetectHtml;
 import org.jsoup.nodes.Document;
 import org.jsoup.nodes.Element;
 
@@ -487,7 +488,7 @@ public class EditTextCompose extends FixedEditText {
                 String h = null;
                 if (raw) {
                     CharSequence text = item.getText();
-                    if (text != null && HtmlHelper.isHtml(text.toString()))
+                    if (text != null && DetectHtml.isHtml(text.toString()))
                         h = text.toString();
                 }
                 if (h == null)

app/src/main/java/eu/faircode/email/HtmlHelper.java

@@ -3829,12 +3829,6 @@ public class HtmlHelper {
                 .remove("x-keep-line");
     }
 
-    static boolean isHtml(String text) {
-        Pattern p = Pattern.compile(".*\\<[^>]+>.*", Pattern.DOTALL);
-        boolean isHtml = p.matcher(text).matches();
-        return isHtml;
-    }
-
     static Spanned fromHtml(@NonNull String html, Context context) {
         Document document = JsoupEx.parse(html);
         return fromDocument(context, document, null, null);

app/src/main/java/org/github/DetectHtml.java

@@ -0,0 +1,43 @@
+package org.github;
+
+/**
+ * Detect HTML markup in a string
+ * This will detect tags or entities
+ *
+ * @author dbennett455@gmail.com - David H. Bennett
+ *
+ */
+
+import java.util.regex.Pattern;
+
+public class DetectHtml
+{
+	// adapted from post by Phil Haack and modified to match better
+	public final static String tagStart=
+		"\\<\\w+((\\s+\\w+(\\s*\\=\\s*(?:\".*?\"|'.*?'|[^'\"\\>\\s]+))?)+\\s*|\\s*)\\>";
+	public final static String tagEnd=
+		"\\</\\w+\\>";
+	public final static String tagSelfClosing=
+		"\\<\\w+((\\s+\\w+(\\s*\\=\\s*(?:\".*?\"|'.*?'|[^'\"\\>\\s]+))?)+\\s*|\\s*)/\\>";
+	public final static String htmlEntity=
+		"&[a-zA-Z][a-zA-Z0-9]+;";
+	public final static Pattern htmlPattern=Pattern.compile(
+	  "("+tagStart+".*"+tagEnd+")|("+tagSelfClosing+")|("+htmlEntity+")",
+	  Pattern.DOTALL
+	);
+
+	/**
+	 * Will return true if s contains HTML markup tags or entities.
+	 *
+	 * @param s String to test
+	 * @return true if string contains HTML
+	 */
+	public static boolean isHtml(String s) {
+		boolean ret=false;
+		if (s != null) {
+			ret=htmlPattern.matcher(s).find();
+		}
+		return ret;
+	}
+
+}