Highlight error line in editor

src/com/annimon/asm/AnalyzerPanel.java

@@ -19,6 +19,7 @@ import javax.swing.JTextPane;
 import javax.swing.event.CaretEvent;
 import javax.swing.event.CaretListener;
 import javax.swing.text.BadLocationException;
+import javax.swing.text.Element;
 import javax.swing.text.JTextComponent;
 import javax.swing.text.Utilities;
 
@@ -97,6 +98,7 @@ public final class AnalyzerPanel extends JPanel {
                 try {
                     syn.analyze();
                 } catch (ExceptionWithLineNumber ex) {
+                    highlightErrorLine(ex.getLineNumber() - 1);
                     showMessageBox("Error", ex.getMessage(), true);
                     return;
                 }
@@ -134,4 +136,13 @@ public final class AnalyzerPanel extends JPanel {
         } catch (IOException ex) {}
         return text.toString();
     }
+    
+    private void highlightErrorLine(int line) {
+        final Element map = textPane.getDocument().getDefaultRootElement();
+        final Element lineElem = map.getElement(line);
+        int endOffset = lineElem.getEndOffset();
+        if (line == map.getElementCount() - 1) endOffset--;
+        textPane.requestFocusInWindow();
+        textPane.select(lineElem.getStartOffset(), endOffset);
+    }
 }

src/com/annimon/asm/exceptions/ExceptionWithLineNumber.java

@@ -12,6 +12,10 @@ public abstract class ExceptionWithLineNumber extends Exception {
         super(message);
         this.lineNumber = lineNumber;
     }
+    
+    public int getLineNumber() {
+        return lineNumber;
+    }
 
     @Override
     public String getMessage() {