Playground: include CSS editor in shareable URLs and URL parsing

scripts/cn1playground/README.md

@@ -151,13 +151,19 @@ Additional imports can be declared in scripts as needed.
 
 ### Shareable Links
 
-The playground can generate shareable URLs that contain the script source code. Use the **"Copy Shareable Playground URL"** option in the side menu to copy a link to the clipboard.
+The playground can generate shareable URLs that contain both the Java script source and CSS editor content. Use the **"Copy Shareable Playground URL"** option in the side menu to copy a link to the clipboard.
+
+**URL Format**:
+- Java source is stored in the `code` query parameter.
+- CSS source is stored in the `css` query parameter.
+- Both values use URL-safe Base64 encoding.
 
-**URL Format**: The generated URL uses a `code` query parameter with URL-safe Base64-encoded script content:
 ```
-https://example.com/playground?code=<base64-encoded-script>
+https://example.com/playground?code=<base64-encoded-script>&css=<base64-encoded-css>
 ```
 
+If the CSS editor is empty, the `css` parameter is omitted.
+
 The encoding uses URL-safe Base64 (replacing `+` with `-` and `/` with `_`, with padding removed).
 
 **Sample Links**: You can also link to built-in samples using the `sample` query parameter:

scripts/cn1playground/common/pom.xml

@@ -11,6 +11,7 @@
     <version>1.0-SNAPSHOT</version>
     <packaging>jar</packaging>
 
+
     <!-- Add your cn1lib dependencies to this section -->
     <dependencies>
         <dependency>

scripts/cn1playground/common/src/main/java/bsh/BshClassManager.java

@@ -2,7 +2,6 @@
 
 import bsh.cn1.CN1AccessRegistry;
 import java.io.InputStream;
-import java.io.PrintWriter;
 import java.util.Collections;
 import java.util.Hashtable;
 import java.util.Map;
@@ -118,7 +117,7 @@ public void addClassPath(Object path) {}
     protected String getClassNameByUnqName(String name) throws UtilEvalError { throw cmUnavailable(); }
     public void addListener(Listener l) {}
     public void removeListener(Listener l) {}
-    public void dump(PrintWriter pw) { pw.println("BshClassManager: reduced CN1 runtime."); }
+    public void dump() {}
     public Class<?> defineClass(String name, byte[] code) { throw new InterpreterError("Class generation is disabled."); }
     protected void classLoaderChanged() {}
 

scripts/cn1playground/common/src/main/java/bsh/BshMethod.java

@@ -27,7 +27,6 @@
 package bsh;
 
 import java.io.Serializable;
-import java.util.Arrays;
 
 /**
     This represents an instance of a bsh method declaration in a particular
@@ -592,8 +591,15 @@ private void reloadTypes() {
     /** {@inheritDoc} */
     @Override
     public void classLoaderChanged() {
-        reload = Reflect.isGeneratedClass(creturnType)
-            || Arrays.asList(cparamTypes).stream()
-                .anyMatch(Reflect::isGeneratedClass);
+        reload = Reflect.isGeneratedClass(creturnType);
+        if (reload || cparamTypes == null) {
+            return;
+        }
+        for (Class<?> paramType : cparamTypes) {
+            if (Reflect.isGeneratedClass(paramType)) {
+                reload = true;
+                return;
+            }
+        }
     }
 }

scripts/cn1playground/common/src/main/java/bsh/FileReader.java

@@ -1,20 +1,19 @@
 package bsh;
 
-import java.io.FileNotFoundException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 
 /** Reduced UTF-8 reader wrapper for CN1 runtime use. */
 final public class FileReader extends InputStreamReader {
-    public FileReader(String path) throws FileNotFoundException {
+    public FileReader(String path) {
         this(openUnsupported(path));
     }
 
     public FileReader(InputStream in) {
         super(in);
     }
 
-    private static InputStream openUnsupported(String path) throws FileNotFoundException {
-        throw new FileNotFoundException("File access is disabled in the reduced CN1 runtime: " + path);
+    private static InputStream openUnsupported(String path) {
+        throw new UnsupportedOperationException("File access is disabled in the reduced CN1 runtime: " + path);
     }
 }

scripts/cn1playground/common/src/main/java/bsh/Interpreter.java

@@ -28,7 +28,6 @@
 package bsh;
 
 import java.io.IOException;
-import java.io.ObjectInputStream;
 import java.io.PrintStream;
 import java.io.Reader;
 import java.io.Serializable;
@@ -1115,20 +1114,6 @@ public Interpreter getParent() {
         return parent;
     }
 
-    /**
-        De-serialization setup.
-        Default out and err streams to stdout, stderr if they are null.
-    */
-    private void readObject(ObjectInputStream stream)
-        throws IOException, ClassNotFoundException
-    {
-        stream.defaultReadObject();
-
-        // set transient fields
-        setOut( System.out );
-        setErr( System.err );
-    }
-
     /**
         Get the prompt string defined by the getBshPrompt() method in the
         global namespace.  This may be from the getBshPrompt() command or may

scripts/cn1playground/common/src/main/java/bsh/JavaCharStream.java

@@ -298,7 +298,7 @@ public JavaCharStream(final java.io.InputStream dstream,
                         final int startcolumn, 
                         final int buffersize)
   {
-    this(new java.io.InputStreamReader(dstream, encoding), startline, startcolumn, buffersize);
+    this(new java.io.InputStreamReader(dstream), startline, startcolumn, buffersize);
   }
 
   /** Constructor. */
@@ -340,7 +340,7 @@ public void reInit(final java.io.InputStream dstream,
                      final int startcolumn,
                      final int buffersize)
   {
-    reInit(new java.io.InputStreamReader(dstream, encoding), startline, startcolumn, buffersize);
+    reInit(new java.io.InputStreamReader(dstream), startline, startcolumn, buffersize);
   }
 
   @Override

scripts/cn1playground/common/src/main/java/bsh/LHS.java

@@ -25,9 +25,6 @@
  *****************************************************************************/
 package bsh;
 
-import java.io.IOException;
-import java.io.ObjectInputStream;
-import java.io.ObjectOutputStream;
 import java.io.Serializable;
 import java.util.Map.Entry;
 import java.util.Objects;
@@ -327,29 +324,4 @@ public String toString() {
             +(nameSpace!=null ? " nameSpace = "+nameSpace.toString(): "");
     }
 
-    /** Reflect Field is not serializable, hide it.
-     * @param s serializer
-     * @throws IOException mandatory throwing exception */
-    private synchronized void writeObject(final ObjectOutputStream s) throws IOException {
-        if ( null != field ) {
-            this.object = field.getDeclaringClass();
-            this.varName = field.getName();
-            this.field = null;
-        }
-        s.defaultWriteObject();
-    }
-
-    /** Fetch field removed from serializer.
-     * @param in secializer.
-     * @throws IOException mandatory throwing exception
-     * @throws ClassNotFoundException mandatory throwing exception  */
-    private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
-        in.defaultReadObject();
-        if ( null == this.object )
-            return;
-        Class<?> cls = this.object.getClass();
-        if ( this.object instanceof Class )
-            cls = (Class<?>) this.object;
-        this.field = BshClassManager.memberCache.get(cls).findField(varName);
-    }
 }

scripts/cn1playground/common/src/main/java/bsh/NameSpace.java

@@ -25,9 +25,6 @@
  *****************************************************************************/
 package bsh;
 
-import java.io.IOException;
-import java.io.ObjectInputStream;
-import java.io.ObjectOutputStream;
 import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.HashMap;
@@ -1135,25 +1132,6 @@ public String toString() {
                 + (this.classInstance != null ? " (class instance) " : "");
     }
 
-    /** Write object.
-     * @param s the s
-     * @throws IOException Signals that an I/O exception has occurred. For
-     *         serialization. Don't serialize non-serializable objects. */
-    private synchronized void writeObject(final ObjectOutputStream s)
-            throws IOException {
-        // clear name resolvers... don't know if this is necessary.
-        this.names.clear();
-        s.defaultWriteObject();
-    }
-    /** Re-initialize transient members.
-     * @param in the serializer
-     * @throws IOException mandatory throwing exception
-     * @throws ClassNotFoundException mandatory throwing exception */
-    private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
-        in.defaultReadObject();
-
-        this.classCache = new HashMap<>();
-    }
     /** Invoke a method in this namespace with the specified args and
      * interpreter reference. No caller information or call stack is required.
      * The method will appear as if called externally from Java.

scripts/cn1playground/common/src/main/java/bsh/SecurityError.java

@@ -25,7 +25,14 @@ private static String argsTypesString(Object[] args) {
         List<String> typesString = new ArrayList<String>();
         for (Class<?> typeClass: Types.getTypes(args))
             typesString.add(typeClass != null ? Types.prettyName(typeClass) : "null");
-        return String.join(", ", typesString);
+        StringBuilder out = new StringBuilder();
+        for (int i = 0; i < typesString.size(); i++) {
+            if (i > 0) {
+                out.append(", ");
+            }
+            out.append(typesString.get(i));
+        }
+        return out.toString();
     }
 
     /** Create a error for when can't construct a instance */

scripts/cn1playground/common/src/main/java/com/codenameone/playground/CN1Playground.java

@@ -64,7 +64,7 @@ public void runApp() {
         CN.setProperty("platformHint.javascript.beforeUnloadMessage", null);
         theme = Resources.getGlobalResources();
         currentScript = resolveInitialScript();
-        currentCss = PlaygroundStateStore.loadCurrentCss();
+        currentCss = resolveInitialCss();
 
         appForm = new Form("Playground", new BorderLayout());
         appForm.setUIID("PlaygroundForm");
@@ -307,12 +307,17 @@ private Button createSideMenuButton(String text, Runnable action) {
     private String resolveInitialScript() {
         String sharedScript = scriptFromUrl();
         if (sharedScript != null) {
-            PlaygroundStateStore.saveCurrentState(sharedScript, PlaygroundStateStore.loadCurrentCss(), PlaygroundStateStore.loadCurrentOutput());
+            PlaygroundStateStore.saveCurrentState(sharedScript, resolveInitialCss(), PlaygroundStateStore.loadCurrentOutput());
             return sharedScript;
         }
         return PlaygroundStateStore.loadCurrentScript();
     }
 
+    private String resolveInitialCss() {
+        String sharedCss = cssFromUrl();
+        return sharedCss == null ? PlaygroundStateStore.loadCurrentCss() : sharedCss;
+    }
+
     private String scriptFromUrl() {
         String href = CN.getProperty("browser.window.location.href", null);
         if (href == null || href.isEmpty()) {
@@ -332,6 +337,22 @@ private String scriptFromUrl() {
         return found == null ? null : found.script;
     }
 
+    private String cssFromUrl() {
+        String href = CN.getProperty("browser.window.location.href", null);
+        if (href == null || href.isEmpty()) {
+            return null;
+        }
+
+        String css = queryParam(href, "css");
+        if (css != null && !css.isEmpty()) {
+            String decoded = decodeSharedScript(css);
+            if (decoded != null && !decoded.trim().isEmpty()) {
+                return decoded;
+            }
+        }
+        return null;
+    }
+
     private String queryParam(String href, String name) {
         int queryStart = href.indexOf('?');
         if (queryStart < 0 || queryStart == href.length() - 1) {
@@ -388,7 +409,13 @@ private void copyCurrentSourceUrl() {
             return;
         }
 
-        Display.getInstance().copyToClipboard(base + "?code=" + encoded);
+        StringBuilder shareUrl = new StringBuilder(base).append("?code=").append(encoded);
+        if (currentCss != null && !currentCss.isEmpty()) {
+            String encodedCss = encodeSharedScript(currentCss);
+            shareUrl.append("&css=").append(encodedCss);
+        }
+
+        Display.getInstance().copyToClipboard(shareUrl.toString());
     }
 
     private String encodeSharedScript(String script) {