Schematic URL. Actually tag is "@schematics <url>" that should be put

inside code comments.

app/src/processing/app/Editor.java

@@ -46,6 +46,7 @@ import gnu.io.*;
 /**
  * Main editor panel for the Processing Development Environment.
  */
+@SuppressWarnings("serial")
 public class Editor extends JFrame implements RunnerListener {
 
   Base base;
@@ -113,7 +114,7 @@ public class Editor extends JFrame implements RunnerListener {
 
   EditorLineStatus lineStatus;
 
-  JEditorPane editorPane;
+  //JEditorPane editorPane;
   
   JEditTextArea textarea;
   EditorListener listener;
@@ -1838,7 +1839,7 @@ public class Editor extends JFrame implements RunnerListener {
     public void run() {
       try {
         sketch.prepare();
-        String appletClassName = sketch.build(false);
+        sketch.build(false);
         statusNotice("Done compiling.");
       } catch (Exception e) {
         status.unprogress();
@@ -1855,7 +1856,7 @@ public class Editor extends JFrame implements RunnerListener {
     public void run() {
       try {
         sketch.prepare();
-        String appletClassName = sketch.build(true);
+        sketch.build(true);
         statusNotice("Done compiling.");
       } catch (Exception e) {
         status.unprogress();
@@ -2628,17 +2629,30 @@ public class Editor extends JFrame implements RunnerListener {
    * Returns the edit popup menu.
    */
   class TextAreaPopup extends JPopupMenu {
-    //String currentDir = System.getProperty("user.dir");
+    //private String currentDir = System.getProperty("user.dir");
-    String referenceFile = null;
+    private String referenceFile = null;
 
-    JMenuItem cutItem;
+    private JMenuItem cutItem;
-    JMenuItem copyItem;
+    private JMenuItem copyItem;
-    JMenuItem discourseItem;
+    private JMenuItem discourseItem;
-    JMenuItem referenceItem;
+    private JMenuItem referenceItem;
+    private JMenuItem openURLItem;
+    private JSeparator openURLItemSeparator;
 
+    private String clickedURL;
 
     public TextAreaPopup() {
-      JMenuItem item;
+      openURLItem = new JMenuItem("Open URL");
+      openURLItem.addActionListener(new ActionListener() {
+        @Override
+        public void actionPerformed(ActionEvent e) {
+          Base.openURL(clickedURL);
+        }
+      });
+      add(openURLItem);
+      
+      openURLItemSeparator = new JSeparator();
+      add(openURLItemSeparator);
       
       cutItem = new JMenuItem("Cut");
       cutItem.addActionListener(new ActionListener() {
@@ -2646,7 +2660,7 @@ public class Editor extends JFrame implements RunnerListener {
             handleCut();
           }
       });
-      this.add(cutItem);
+      add(cutItem);
 
       copyItem = new JMenuItem("Copy");
       copyItem.addActionListener(new ActionListener() {
@@ -2654,7 +2668,7 @@ public class Editor extends JFrame implements RunnerListener {
             handleCopy();
           }
         });
-      this.add(copyItem);
+      add(copyItem);
 
       discourseItem = new JMenuItem("Copy for Forum");
       discourseItem.addActionListener(new ActionListener() {
@@ -2662,7 +2676,7 @@ public class Editor extends JFrame implements RunnerListener {
             handleDiscourseCopy();
           }
         });
-      this.add(discourseItem);
+      add(discourseItem);
 
       discourseItem = new JMenuItem("Copy as HTML");
       discourseItem.addActionListener(new ActionListener() {
@@ -2670,15 +2684,15 @@ public class Editor extends JFrame implements RunnerListener {
             handleHTMLCopy();
           }
         });
-      this.add(discourseItem);
+      add(discourseItem);
 
-      item = new JMenuItem("Paste");
+      JMenuItem item = new JMenuItem("Paste");
       item.addActionListener(new ActionListener() {
           public void actionPerformed(ActionEvent e) {
             handlePaste();
           }
         });
-      this.add(item);
+      add(item);
 
       item = new JMenuItem("Select All");
       item.addActionListener(new ActionListener() {
@@ -2686,9 +2700,9 @@ public class Editor extends JFrame implements RunnerListener {
           handleSelectAll();
         }
       });
-      this.add(item);
+      add(item);
 
-      this.addSeparator();
+      addSeparator();
 
       item = new JMenuItem("Comment/Uncomment");
       item.addActionListener(new ActionListener() {
@@ -2696,7 +2710,7 @@ public class Editor extends JFrame implements RunnerListener {
             handleCommentUncomment();
           }
       });
-      this.add(item);
+      add(item);
 
       item = new JMenuItem("Increase Indent");
       item.addActionListener(new ActionListener() {
@@ -2704,7 +2718,7 @@ public class Editor extends JFrame implements RunnerListener {
             handleIndentOutdent(true);
           }
       });
-      this.add(item);
+      add(item);
 
       item = new JMenuItem("Decrease Indent");
       item.addActionListener(new ActionListener() {
@@ -2712,9 +2726,9 @@ public class Editor extends JFrame implements RunnerListener {
             handleIndentOutdent(false);
           }
       });
-      this.add(item);
+      add(item);
 
-      this.addSeparator();
+      addSeparator();
 
       referenceItem = new JMenuItem("Find in Reference");
       referenceItem.addActionListener(new ActionListener() {
@@ -2722,11 +2736,31 @@ public class Editor extends JFrame implements RunnerListener {
             handleFindReference();
           }
         });
-      this.add(referenceItem);
+      add(referenceItem);
+    }
+
+    private boolean clickedURL(String line, int offset) {
+      String[] parse = SyntaxUtilities.parseCommentUrls(line);
+      if (parse==null)
+        return false;
+      int pos = parse[0].length()+parse[1].length();
+      if (offset<pos || offset>pos+2)
+        return false;
+      clickedURL = parse[1];
+      return true;
     }
     
     // if no text is selected, disable copy and cut menu items
     public void show(Component component, int x, int y) {
+      int line = textarea.getLineOfOffset(textarea.xyToOffset(x, y));
+      if (clickedURL(textarea.getLineText(line), textarea.xToOffset(line, x))) {
+        openURLItem.setVisible(true);
+        openURLItemSeparator.setVisible(true);
+      } else {
+        openURLItem.setVisible(false);
+        openURLItemSeparator.setVisible(false);
+      }
+      
       if (textarea.isSelectionActive()) {
         cutItem.setEnabled(true);
         copyItem.setEnabled(true);

app/src/processing/app/syntax/SyntaxUtilities.java

@@ -11,6 +11,8 @@ package processing.app.syntax;
 
 import javax.swing.text.*;
 import java.awt.*;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 
 
 /**
@@ -148,7 +150,10 @@ public class SyntaxUtilities
           styles[id].setGraphicsFlags(gfx,defaultFont);
 
         line.count = length;
-        x = Utilities.drawTabbedText(line,x,y,gfx,expander,0);
+        if (id == Token.COMMENT1 || id == Token.COMMENT2)
+          x = drawTabbedCommentsText(line, x, y, gfx, expander);
+        else
+          x = Utilities.drawTabbedText(line, x, y, gfx, expander, 0);        
         line.offset += length;
         offset += length;
 
@@ -158,6 +163,69 @@ public class SyntaxUtilities
     return x;
   }
 
+  /**
+   * Parse comments and identify "@schematics <b>&lt;something&gt;</b>" pattern.
+   * 
+   * @param line
+   *          A string to parse
+   * @return <b>null</b> if the pattern is not found, otherwise an array of
+   *         String is returned: the elements with index 0, 1 and 2 are
+   *         respectively the preamble, the <b>&lt;something&gt;</b> stuff, and
+   *         the remaining part of the string.
+   */
+  public static String[] parseCommentUrls(String line) {
+    // Try to find pattern
+    Pattern schematics = Pattern.compile("@schematics\\s+([^\\s]+)");
+    Matcher m = schematics.matcher(line.toString());
+    if (!m.find())
+      return null;
+
+    String res[] = new String[3];
+    res[0] = line.substring(0, m.start(1));
+    res[1] = line.substring(m.start(1), m.end(1));
+    res[2] = line.substring(m.end(1));
+    // System.out.println("0 =>"+res[0]+"<\n1 =>"+res[1]+"< \n2 =>"+res[2]+"<");
+    return res;
+  }
+
+  public static Segment stringToSegment(String v) {
+    return new Segment(v.toCharArray(), 0, v.length());
+  }
+
+  private static int drawTabbedCommentsText(Segment line, int x, int y,
+      Graphics gfx, TabExpander expander) {
+
+    String parse[] = parseCommentUrls(line.toString());
+    if (parse == null)
+      // Revert to plain writing.
+      return Utilities.drawTabbedText(line, x, y, gfx, expander, 0);
+    Segment pre = stringToSegment(parse[0]);
+    Segment tag = stringToSegment(parse[1]);
+    Segment post = stringToSegment(parse[2]);
+
+    x = Utilities.drawTabbedText(pre, x, y, gfx, expander, 0);
+    x = Utilities.drawTabbedText(tag, x, y, gfx, expander, 0);
+
+    // Draw arrow.
+    FontMetrics metrics = gfx.getFontMetrics();
+    int h = metrics.getHeight() - 2;
+    drawArrow(gfx, x, y - h + metrics.getDescent() - 1, h, h);
+    x = Utilities.drawTabbedText(post, x, y, gfx, expander, 0);
+    return x;
+  }
+
+  private static void drawArrow(Graphics gfx, int x, int y, int w, int h) {
+    int h2 = h / 2;
+    int h4 = h / 4;
+    gfx.drawLine(x, y+h2, x+h2, y);
+    gfx.drawLine(x+h2, y, x+h2, y+h4);
+    gfx.drawLine(x+h2, y+h4, x+h, y+h4);
+    gfx.drawLine(x+h, y+h4, x+h, y+h-h4);
+    gfx.drawLine(x+h, y+h-h4, x+h2, y+h-h4);
+    gfx.drawLine(x+h2,y+h-h4, x+h2, y+h);
+    gfx.drawLine(x, y+h2, x+h2, y+h);
+  }
+  
   // private members
   private SyntaxUtilities() {}
 }