source: trunk/src/org/expeditee/actions/Python.java@ 1102

/**
 *    Python.java
 *    Copyright (C) 2010 New Zealand Digital Library, http://expeditee.org
 *
 *    This program is free software: you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation, either version 3 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.expeditee.actions;

import java.util.List;

import javax.script.Invocable;

import org.expeditee.gui.Frame;
import org.expeditee.gui.MessageBay;
import org.expeditee.items.Item;
import org.expeditee.items.Text;

/**
 * Javascript parser.
 * Works differently to the other Javascript class in that it
 * parses a frame as a whole rather than parsing individual text items as separate statements
 * 
 * @author jts21
 * @author davidb
 */
public class Python extends ScriptBase {
        
    protected void init() {
        ERROR_FRAMESET = "PythonErrors";
        scriptEngine = scriptEngineManager.getEngineByMimeType("application/python");
        scriptEngine.put("invocable", (Invocable) scriptEngine);
    }
    
    public static void printPythonFrame(Item item) {
        if(item.getChild() == null) {
            // if the user clicked on the action without an item on their cursor
            if(item.hasAction()) {
                boolean isThis = false;
                for(String s : item.getAction()) {
                    if(s.equalsIgnoreCase("printPythonFrame")) {
                        isThis = true;
                        break;
                    }
                }
                if(isThis) {
                    System.out.println(new Python(item.getParentOrCurrentFrame(), true));
                    return;
                }
            }
            MessageBay.warningMessage("Requires either an item with a link to a frame, or no item (will run the current frame)");
        } else {
            System.out.println(new Python(item.getChild(), true));
        }
    }
    
    public static void runPythonFrame(Item item) throws Exception {
        if(item.getChild() == null) {
            // if the user clicked on the action without an item on their cursor
            if(item.hasAction()) {
                boolean isThis = false;
                for(String s : item.getAction()) {
                    if(s.equalsIgnoreCase("runPythonFrame")) {
                        isThis = true;
                        break;
                    }
                }
                if(isThis) {
                    Python.runFrameFollow(item.getParentOrCurrentFrame());
                    return;
                }
            }
            MessageBay.warningMessage("Requires either an item with a link to a frame, or no item (will run the current frame)");
        } else {
            Python.runFrameFollow(item.getChild());
        }
    }
    
    
    private static synchronized void runFrameFollow(Frame frame) throws Exception {
        Python python = new Python(frame, true);
        python.runFrame(frame,true);   
    }
    
    private Python(Frame frame, boolean followLinks) {
        super(frame,followLinks);
    }
    
    
    protected void processItems(List<Item> overlapping_y_ordered_items, boolean followLinks, int depth) {
        
        // Loop through the items looking for code and links to new frames
        for(Item i : overlapping_y_ordered_items) {
            if(followLinks && i.hasLink()) {
                Frame child = i.getChild();
                if(child != null && !seen.contains(child)) {
                    this.parseFrame(child, true, depth);
                }
            }
            if(i instanceof Text && !i.isAnnotation()) {
                String text = ((Text)i).getText();
                if (i == org.expeditee.io.flowlayout.XGroupItem.GROUPSEP_START) {
                    text = null;
                    depth++;
                }
                else if (i == org.expeditee.io.flowlayout.XGroupItem.GROUPSEP_END) {
                    text = null;
                    depth--;
                }

                if (text != null) {
                    int lineNumber = 0;
                    for(String line : text.trim().split("[\\n\\r]+")) {
                        if (depth>0) {
                            sb.append(String.format("%1$" + (4*depth) + "s", "")); // indent with 'depth' x 4 spaces    
                        }
                        sb.append(line).append("\n");
                        lines.add(new CodeLine((Text)i, lineNumber++, line));
                    }
                }
            }
        }

        
    }

}