/**
* Copyright (c) 2005-2012 by Appcelerator, Inc. All Rights Reserved.
* Licensed under the terms of the Eclipse Public License (EPL).
* Please see the license.txt included with this distribution for details.
* Any modifications to this file must keep this entire header intact.
*/
package org.python.pydev.debug.ui.actions;
import java.util.Set;
import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.commands.IHandler;
import org.eclipse.core.expressions.IEvaluationContext;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.debug.core.DebugException;
import org.eclipse.debug.core.DebugPlugin;
import org.eclipse.debug.core.ILaunch;
import org.eclipse.debug.core.model.IDebugElement;
import org.eclipse.debug.core.model.IValue;
import org.eclipse.debug.core.model.IWatchExpression;
import org.eclipse.debug.ui.DebugPopup;
import org.eclipse.debug.ui.DebugUITools;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.text.ITextSelection;
import org.eclipse.jface.text.TextSelection;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IEditorActionDelegate;
import org.eclipse.ui.IEditorPart;
import org.python.pydev.core.log.Log;
import org.python.pydev.debug.core.PydevDebugPlugin;
/**
* The original idea was not to use the <code>org.eclipse.jdt.internal.debug.ui</code> stuff; that's why this does not
* do things like extending {@link org.eclipse.jdt.internal.debug.ui.actions.PopupDisplayAction}, etc.
*
* But after all was said and done, I didn't feel like finding an alternate way of writing {@link DisplayPopup#persist()},
* so this does result in depending on <code>org.eclipse.jdt.debug.ui</code>
* just for that - silly me.
*
* But then again, the original had dependencies on <code>org.eclipse.jdt</code>,
* <code>org.eclipse.jdt.code</code> and <code>org.eclipse.jdt.launching</code>, so what's one extra one?
*
* @see
*
* @author "<a href=mailto:grisha@alum.mit.edu>Gregory Golberg</A>"
*/
public class EvalExpressionAction extends AbstractHandler implements IHandler, IEditorActionDelegate {
/**
* Action ID for displaying variable
*/
public static final String ACTION_DEFINITION_ID = "org.python.pydev.debug.command.Display"; //$NON-NLS-1$
private ITextSelection fSelection;
@Override
public void setActiveEditor(IAction action, IEditorPart targetEditor) {
}
/*
* @see org.eclipse.ui.IActionDelegate#run(org.eclipse.jface.action.IAction)
*/
@Override
public void run(IAction action) {
if (fSelection == null) {
return;
}
String text = fSelection.getText();
eval(text);
}
/*
* @see org.eclipse.ui.IActionDelegate#selectionChanged(org.eclipse.jface.action.IAction, org.eclipse.jface.viewers.ISelection)
*/
@Override
public void selectionChanged(IAction action, ISelection selection) {
fSelection = null;
if (selection instanceof ITextSelection) {
fSelection = (ITextSelection) selection;
}
}
/**
* This hack just creates a Watch expression, gets result and removes the watch expression.
* This is simple, since the watch functionality is already there.
*
* @see WatchExpressionAction#createExpression
*/
private void eval(final String expr) {
final IWatchExpression expression = createWatchExpression(expr);
final Shell shell = PydevDebugPlugin.getActiveWorkbenchWindow().getShell();
Display display = PydevDebugPlugin.getDefault().getWorkbench().getDisplay();
final Point point = display.getCursorLocation();
Display.getDefault().asyncExec(new Runnable() {
@Override
public void run() {
expression.evaluate();
waitForExpressionEvaluation(expression);
try {
IValue value = expression.getValue();
String result = null;
if (value != null) {
result = expr + "\n" + value.getValueString();
DisplayPopup popup = new DisplayPopup(shell, point, result);
popup.open();
}
} catch (DebugException e) {
DebugPlugin.log(e);
return;
} catch (Throwable t) {
DebugPlugin.log(t);
}
}
});
}
/**
* Enters a busy wait until the expression finishes evaluating
*
* @param expression the watch expression we shoud wait for
*/
public static void waitForExpressionEvaluation(final IWatchExpression expression) {
while (expression.isPending()) {
try {
Thread.sleep(50);
} catch (InterruptedException e) {
continue;
}
}
try {
Thread.sleep(50);
} catch (InterruptedException e) {
}
}
/**
* Creates a watch expression to be evaluated with the current debug context.
*
* @param expr the expression that should be evaluated in the current context
* @return the created expression.
*/
public static IWatchExpression createWatchExpression(final String expr) {
final IWatchExpression expression = DebugPlugin.getDefault().getExpressionManager().newWatchExpression(expr);
IAdaptable object = DebugUITools.getDebugContext();
IDebugElement context = null;
if (object instanceof IDebugElement) {
context = (IDebugElement) object;
} else if (object instanceof ILaunch) {
context = ((ILaunch) object).getDebugTarget();
}
expression.setExpressionContext(context);
return expression;
}
/*
* @see org.eclipse.core.commands.AbstractHandler#execute(org.eclipse.core.commands.ExecutionEvent)
*/
@Override
public Object execute(ExecutionEvent event) throws ExecutionException {
Object applicationContext = event.getApplicationContext();
if (applicationContext instanceof IEvaluationContext) {
IEvaluationContext evalCtx = (IEvaluationContext) applicationContext;
Object obj = evalCtx.getDefaultVariable();
if (obj instanceof Set) {
Set set = (Set) obj;
if (set.size() > 0) {
Object sel = set.iterator().next();
if (sel instanceof TextSelection) {
String expr = ((TextSelection) sel).getText();
if (expr != null && expr.trim().length() > 0) {
eval(expr);
}
}
}
}
} else {
Log.log("Expected IEvaluationContext. Received: " + applicationContext.getClass());
}
return null;
}
/**
* @see org.eclipse.jdt.internal.debug.ui.actions.PopupDisplayAction.DisplayPopup
*/
private class DisplayPopup extends DebugPopup {
public DisplayPopup(Shell shell, Point point, String text) {
super(shell, point, ACTION_DEFINITION_ID + "2");
this.text = text;
}
@Override
protected String getActionText() {
return "Move to Display view";
}
@Override
protected void persist() {
// String displayId = IJavaDebugUIConstants.ID_DISPLAY_VIEW;
// IWorkbenchPage page = PydevDebugPlugin.getActiveWorkbenchWindow().getActivePage();
// IViewReference viewRef = page.findViewReference(displayId);
// IViewPart view = null;
// if (viewRef != null) {
// view = viewRef.getView(true);
// } else {
// try {
// view = page.showView(displayId);
// } catch (PartInitException e) {
// DebugPlugin.log(e);
// return;
// }
// }
// page.activate(page.getActivePart());
// IDataDisplay adapter = (IDataDisplay) view.getAdapter(IDataDisplay.class);
// adapter.displayExpression(this.text);
super.persist();
}
private String text;
@Override
protected Control createDialogArea(Composite parent) {
GridData gd = new GridData(GridData.FILL_BOTH);
StyledText text = new StyledText(parent,
SWT.MULTI | SWT.READ_ONLY | SWT.WRAP | SWT.H_SCROLL | SWT.V_SCROLL);
text.setLayoutData(gd);
text.setForeground(parent.getDisplay().getSystemColor(SWT.COLOR_INFO_FOREGROUND));
text.setBackground(parent.getDisplay().getSystemColor(SWT.COLOR_INFO_BACKGROUND));
text.setText(this.text);
return text;
}
}
}