1 // Copyright (c) 2009 The Chromium Authors. All rights reserved.

     2 // Use of this source code is governed by a BSD-style license that can be

     3 // found in the LICENSE file.

     4 

     5 package org.chromium.debug.ui.editors;

     6 

     7 import org.chromium.debug.core.model.StackFrame;

     8 import org.chromium.debug.core.util.JsValueStringifier;

     9 import org.chromium.sdk.CallFrame;

    10 import org.chromium.sdk.JsVariable;

    11 import org.eclipse.core.runtime.IAdaptable;

    12 import org.eclipse.debug.ui.DebugUITools;

    13 import org.eclipse.jface.text.IDocument;

    14 import org.eclipse.jface.text.IRegion;

    15 import org.eclipse.jface.text.ITextHover;

    16 import org.eclipse.jface.text.ITextViewer;

    17 

    18 /**

    19  * Supplies a hover for JavaScript expressions while on a breakpoint.

    20  */

    21 public class JsDebugTextHover implements ITextHover {

    22 

    23   private static final JsValueStringifier STRINGIFIER = new JsValueStringifier();

    24 

    25   public String getHoverInfo(ITextViewer textViewer, IRegion hoverRegion) {

    26     IDocument doc = textViewer.getDocument();

    27     String expression = JavascriptUtil.extractSurroundingJsIdentifier(doc, hoverRegion.getOffset());

    28     if (expression == null) {

    29       return null;

    30     }

    31 

    32     IAdaptable context = DebugUITools.getDebugContext();

    33     if (context == null) { // debugger not active

    34       return null;

    35     }

    36 

    37     StackFrame frame = (StackFrame) context.getAdapter(StackFrame.class);

    38     if (frame == null) { // not a stackframe-related context

    39       return null;

    40     }

    41 

    42     final JsVariable[] result = new JsVariable[1];

    43     frame.getCallFrame().evaluateSync(expression, new CallFrame.EvaluateCallback() {

    44       public void success(JsVariable var) {

    45         result[0] = var;

    46       }

    47       public void failure(String errorMessage) {

    48       }

    49     });

    50     if (result[0] == null) {

    51       return null;

    52     }

    53 

    54     return STRINGIFIER.render(result[0].getValue());

    55   }

    56 

    57   public IRegion getHoverRegion(ITextViewer textViewer, int offset) {

    58     IDocument doc = textViewer.getDocument();

    59     return JavascriptUtil.getSurroundingIdentifierRegion(doc, offset, false);

    60   }

    61 

    62 }