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/*
*(c) Copyright QNX Software Systems Ltd. 2002.
* All Rights Reserved.
*
*/
package org.eclipse.cdt.debug.internal.ui.editors;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.eclipse.cdt.debug.core.model.ICExpressionEvaluator;
import org.eclipse.cdt.debug.internal.ui.CDebugUIUtils;
import org.eclipse.cdt.debug.ui.CDebugUIPlugin;
import org.eclipse.cdt.ui.text.c.hover.ICEditorTextHover;
import org.eclipse.debug.core.DebugException;
import org.eclipse.debug.core.DebugPlugin;
import org.eclipse.debug.core.ILaunchManager;
import org.eclipse.debug.core.model.IDebugTarget;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.ui.IEditorPart;
/**
*
* The text hovering support for C/C++ debugger.
*
* @since: Sep 12, 2002
*/
public class DebugTextHover implements ICEditorTextHover
{
static final private int MAX_HOVER_INFO_SIZE = 100;
/**
* Constructor for DebugTextHover.
*/
public DebugTextHover()
{
super();
}
/**
* @see org.eclipse.jface.text.ITextHover#getHoverInfo(ITextViewer, IRegion)
*/
public String getHoverInfo( ITextViewer textViewer, IRegion hoverRegion )
{
DebugPlugin debugPlugin = DebugPlugin.getDefault();
if ( debugPlugin == null )
{
return null;
}
ILaunchManager launchManager = debugPlugin.getLaunchManager();
if ( launchManager == null )
{
return null;
}
IDebugTarget[] targets = launchManager.getDebugTargets();
if ( targets != null && targets.length > 0 )
{
try
{
IDocument document = textViewer.getDocument();
if ( document == null )
return null;
String expression = document.get( hoverRegion.getOffset(), hoverRegion.getLength() );
if ( expression == null )
return null;
expression = expression.trim();
if ( expression.length() == 0 )
return null;
List targetList = new ArrayList( targets.length );
for ( int i = 0; i < targets.length; i++ )
{
ICExpressionEvaluator ee = (ICExpressionEvaluator)targets[i].getAdapter( ICExpressionEvaluator.class );
if ( ee != null )
{
targetList.add(targets[i] );
}
}
StringBuffer buffer = new StringBuffer();
boolean showDebugTarget = targetList.size() > 1;
Iterator iterator = targetList.iterator();
while ( iterator.hasNext() )
{
IDebugTarget target = (IDebugTarget)iterator.next();
ICExpressionEvaluator ee = (ICExpressionEvaluator)target.getAdapter( ICExpressionEvaluator.class );
if ( ee.canEvaluate() )
{
String result = evaluateExpression( ee, expression );
try
{
if ( result != null )
appendVariable( buffer, expression, result.trim(), showDebugTarget ? target.getName() : null );
}
catch( DebugException x )
{
CDebugUIPlugin.log( x );
}
}
}
if ( buffer.length() > 0 )
{
return buffer.toString();
}
}
catch ( BadLocationException x )
{
CDebugUIPlugin.log( x );
}
}
return null;
}
/**
* @see org.eclipse.jface.text.ITextHover#getHoverRegion(ITextViewer, int)
*/
public IRegion getHoverRegion( ITextViewer viewer, int offset )
{
/*
Point selectedRange = viewer.getSelectedRange();
if ( selectedRange.x >= 0 &&
selectedRange.y > 0 &&
offset >= selectedRange.x &&
offset <= selectedRange.x + selectedRange.y )
return new Region( selectedRange.x, selectedRange.y );
*/
if ( viewer != null )
return CDebugUIUtils.findWord( viewer.getDocument(), offset );
return null;
}
private String evaluateExpression( ICExpressionEvaluator ee, String expression )
{
String result = null;
try
{
result = ee.evaluateExpressionToString( expression );
}
catch( DebugException e )
{
// ignore
}
return result;
}
/**
* A variable gets one line for each debug target it appears in.
*/
private static void appendVariable( StringBuffer buffer,
String expression,
String value,
String debugTargetName ) throws DebugException
{
if ( value.length() > MAX_HOVER_INFO_SIZE )
value = value.substring( 0, MAX_HOVER_INFO_SIZE ) + " ..."; //$NON-NLS-1$
buffer.append( "<p>" ); //$NON-NLS-1$
if ( debugTargetName != null )
{
buffer.append( '[' + debugTargetName + "] " ); //$NON-NLS-1$
}
buffer.append( makeHTMLSafe( expression ) );
buffer.append( " = " ); //$NON-NLS-1$
String safeValue = "<b>" + makeHTMLSafe( value ) + "</b>"; //$NON-NLS-1$ //$NON-NLS-2$
buffer.append( safeValue );
buffer.append( "</p>" ); //$NON-NLS-1$
}
/**
* Replace any characters in the given String that would confuse an HTML
* parser with their escape sequences.
*/
private static String makeHTMLSafe( String string )
{
StringBuffer buffer = new StringBuffer( string.length() );
for ( int i = 0; i != string.length(); i++ )
{
char ch = string.charAt( i );
switch( ch )
{
case '&':
buffer.append( "&" ); //$NON-NLS-1$
break;
case '<':
buffer.append( "<" ); //$NON-NLS-1$
break;
case '>':
buffer.append( ">" ); //$NON-NLS-1$
break;
default:
buffer.append( ch );
break;
}
}
return buffer.toString();
}
/* (non-Javadoc)
* @see org.eclipse.cdt.ui.text.c.hover.ICEditorTextHover#setEditor(org.eclipse.ui.IEditorPart)
*/
public void setEditor(IEditorPart editor) {
}
}
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