org.eclipse.jface.text.ITextViewer#getDocument ( )源码实例Demo

/**
 * Returns the Java elements at the given hover region.
 *
 * @param textViewer the text viewer
 * @param hoverRegion the hover region
 * @return the array with the Java elements or <code>null</code>
 * @since 3.4
 */
protected IJavaElement[] getJavaElementsAt(ITextViewer textViewer, IRegion hoverRegion) {
	/*
	 * The region should be a word region an not of length 0.
	 * This check is needed because codeSelect(...) also finds
	 * the Java element if the offset is behind the word.
	 */
	if (hoverRegion.getLength() == 0)
		return null;
	
	IDocument document= textViewer.getDocument();
	if (document != null && isInheritDoc(document, hoverRegion))
		return null;

	ICodeAssist resolve= getCodeAssist();
	if (resolve != null) {
		try {
			return resolve.codeSelect(hoverRegion.getOffset(), hoverRegion.getLength());
		} catch (JavaModelException x) {
			return null;
		}
	}
	return null;
}
 

@Override
public void apply(ITextViewer viewer, char trigger, int stateMask, int offset) {
    IDocument document = viewer.getDocument();
    int finalOffset = applyOnDocument(viewer, document, trigger, stateMask, offset);
    if (finalOffset >= 0) {
        try {
            PySelection ps = new PySelection(document, finalOffset);
            int firstCharPosition = PySelection.getFirstCharPosition(ps.getLine());
            int lineOffset = ps.getLineOffset();
            int location = lineOffset + firstCharPosition;
            int len = finalOffset - location;
            fCursorPosition = location;
            fReplacementLength = len;

        } catch (Exception e) {
            Log.log(e);
        }

    }
}
 

@Override
public IHyperlink[] detectHyperlinks(ITextViewer textViewer, IRegion region, boolean canShowMultipleHyperlinks) {
    JsonDocument document = (JsonDocument) textViewer.getDocument();
    JsonPointer basePath = document.getPath(region);

    if (!canDetect(basePath)) {
        return null;
    }

    HyperlinkInfo info = getHyperlinkInfo(textViewer, region);
    if (info == null) {
        return null;
    }

    return doDetect(document, textViewer, info, basePath);
}
 

public String getHoverInfo(ITextViewer textViewer, IRegion subject) {
	try {
		IDocument doc= textViewer.getDocument();
		int offset= subject.getOffset();
		if (offset >= 2 && "${".equals(doc.get(offset-2, 2))) { //$NON-NLS-1$
			String varName= doc.get(offset, subject.getLength());
			TemplateContextType contextType= fProcessor.getContextType();
			if (contextType != null) {
				Iterator iter= contextType.resolvers();
				while (iter.hasNext()) {
					TemplateVariableResolver var= (TemplateVariableResolver) iter.next();
					if (varName.equals(var.getType())) {
						return var.getDescription();
					}
				}
			}
		}				
	} catch (BadLocationException e) {
	}
	return null;
}
 

@Override
public void apply(ITextViewer viewer, char trigger, int stateMask, int offset) {
	IDocument document = viewer.getDocument();
	// ImportsVariableResolver may add imports, so start a rewrite session if possible. 
	// This will compound all document changes in one Undo entry.
	if (document instanceof IDocumentExtension4) {
		IDocumentExtension4 docExt4 = (IDocumentExtension4) document;
		DocumentRewriteSession session = docExt4.startRewriteSession(DocumentRewriteSessionType.UNRESTRICTED);
		super.apply(viewer, trigger, stateMask, offset);
		if (session != null) {
			docExt4.stopRewriteSession(session);
		}
	} else {
		super.apply(viewer, trigger, stateMask, offset);
	}
}
 

public static IConsole getConsole(IWorkbenchPart part) {
      if(!(part instanceof IViewPart)){
          return null;
      }

      IViewPart vp =(IViewPart) part;
      if (vp instanceof PageBookView) {
          IPage page = ((PageBookView) vp).getCurrentPage();
          ITextViewer viewer = getViewer(page);
          if (viewer == null || viewer.getDocument() == null)
          	return null;
      }

      IConsole con = null;
  	try {
  		con = ((IConsoleView)part).getConsole();
  	} catch (Exception e) {

}

return con;
  }
 

@Override
public ICompletionProposal[] computeCompletionProposals(ITextViewer viewer, int offset) {
	IDocument document = viewer.getDocument();
	String textToOffset = document.get().substring(0, offset);
	if (isOffsetInComment(textToOffset)) {
		return new ICompletionProposal[0];
	}

	Matcher matcher = ENDS_WITH_WORD_PATTERN.matcher(textToOffset.substring(textToOffset.lastIndexOf('\n') + 1));
	matcher.matches();
	String indent = matcher.group("indent"); //$NON-NLS-1$
	String prefix = matcher.group("prefix"); //$NON-NLS-1$

	// Use range from selection (if available) to support "surround with" style
	// completions
	Range range = getRangeFromSelection(document, viewer).orElseGet(() -> {
		// no selection available: get range from prefix
		try {
			int line = document.getLineOfOffset(offset);
			int lineOffset = offset - document.getLineOffset(line);
			Position start = new Position(line, lineOffset - prefix.length());
			Position end = new Position(line, lineOffset);
			return new Range(start, end);
		} catch (BadLocationException e) {
			return null;
		}
	});
	if (range == null) {
		return new ICompletionProposal[] {};
	}

	Collection<LSPDocumentInfo> infos = LanguageServiceAccessor.getLSPDocumentInfosFor(document,
			capabilities -> Boolean.TRUE.equals(capabilities.getReferencesProvider()));
	LSPDocumentInfo docInfo = infos.iterator().next();

	ICompletionProposal[] proposals = snippets.stream().filter(s -> s.matchesPrefix(prefix))
			.map(s -> s.convertToCompletionProposal(offset, docInfo, prefix, indent, range))
			.toArray(ICompletionProposal[]::new);
	return proposals;
}
 

@Override
public void install(ITextViewer viewer) {
	Assert.isNotNull(viewer);

	this.viewer = viewer;
	viewer.addTextInputListener(internalListener);

	IDocument document = viewer.getDocument();
	if (document != null) {
		internalListener.inputDocumentChanged(null, document);
	}
	themeChangeListener = new ThemeChangeListener();
	ThemeManager.getInstance().addPreferenceChangeListener(themeChangeListener);
}
 

/**
 * Creates a concrete template context for the given region in the document. This involves finding out which
 * context type is valid at the given location, and then creating a context of this type. The default implementation
 * returns a <code>DocumentTemplateContext</code> for the context type at the given location.
 *
 * @param contextType the context type for the template.
 * @param viewer the viewer for which the context is created
 * @param region the region into <code>document</code> for which the context is created
 * @return a template context that can handle template insertion at the given location, or <code>null</code>
 */
public static PyDocumentTemplateContext createContext(final TemplateContextType contextType,
        final ITextViewer viewer, final IRegion region, String indent) {
    if (contextType != null) {
        IDocument document = viewer.getDocument();
        final String indentTo = indent;
        return new PyDocumentTemplateContext(contextType, document, region.getOffset(), region.getLength(),
                indentTo, viewer);
    }
    return null;
}
 

/**
 * Special code added to allow tabstop positions so we can easily tab past the quotes for Events/Attributes.
 */
@Override
public void apply(ITextViewer viewer, char trigger, int stateMask, int offset)
{
	super.apply(viewer, trigger, stateMask, offset);

	// See if there are any positions that should be linked. Last is always exit, first is cursor position
	if (_positions != null && _positions.length > 0)
	{
		IDocument document = viewer.getDocument();
		boolean validPrefix = isValidPrefix(getPrefix(document, offset), getDisplayString());
		int shift = (validPrefix) ? offset - this._replacementOffset : 0;

		try
		{
			LinkedModeModel.closeAllModels(document); // Exit out of any existing linked mode

			LinkedModeModel model = new LinkedModeModel();
			int i = 0;
			for (int pos : _positions)
			{
				LinkedPositionGroup group = new LinkedPositionGroup();
				group.addPosition(new LinkedPosition(document, (offset - shift) + pos, 0, i++));
				model.addGroup(group);
			}

			model.forceInstall();
			LinkedModeUI ui = new LinkedModeUI(model, viewer);
			ui.setCyclingMode(LinkedModeUI.CYCLE_ALWAYS);
			ui.setExitPosition(viewer, (offset - shift) + _positions[_positions.length - 1], 0, Integer.MAX_VALUE);
			ui.enter();
		}
		catch (BadLocationException e)
		{
			IdeLog.logError(XMLPlugin.getDefault(), e);
		}
	}
}
 

/**
 * Special code added to allow tabstop positions so we can easily tab past the quotes for Events/Attributes.
 */
@Override
public void apply(ITextViewer viewer, char trigger, int stateMask, int offset)
{
	super.apply(viewer, trigger, stateMask, offset);

	// See if there are any positions that should be linked. Last is always exit, first is cursor position
	if (_positions != null && _positions.length > 0)
	{
		IDocument document = viewer.getDocument();
		boolean validPrefix = isValidPrefix(getPrefix(document, offset), getDisplayString());
		int shift = (validPrefix) ? offset - this._replacementOffset : 0;

		try
		{
			LinkedModeModel.closeAllModels(document); // Exit out of any existing linked mode

			LinkedModeModel model = new LinkedModeModel();
			int i = 0;
			for (int pos : _positions)
			{
				LinkedPositionGroup group = new LinkedPositionGroup();
				group.addPosition(new LinkedPosition(document, (offset - shift) + pos, 0, i++));
				model.addGroup(group);
			}

			model.forceInstall();
			LinkedModeUI ui = new LinkedModeUI(model, viewer);
			ui.setCyclingMode(LinkedModeUI.CYCLE_ALWAYS);
			ui.setExitPosition(viewer, (offset - shift) + _positions[_positions.length - 1], 0, Integer.MAX_VALUE);
			ui.enter();
		}
		catch (BadLocationException e)
		{
			IdeLog.logError(HTMLPlugin.getDefault(), e);
		}
	}
}
 

public ICompletionProposal[] computeCompletionProposals(ITextViewer viewer, int offset) {
	final IDocument document = viewer.getDocument();
	// get the selection range
	final Point selectedRange = viewer.getSelectedRange();

	final List<ICompletionProposal> propList = new ArrayList<ICompletionProposal>();
	try {
		// The zero-based row index of the caret.
		final int caretRowIndex = document.getLineOfOffset(offset);
		// The zero-based column index of the caret.
		final int carretColumnIndex = offset - document.getLineOffset(caretRowIndex);
		if (selectedRange.y > 0) {
			// the range is non-empty
			final String text = document.get(selectedRange.x, selectedRange.y);
			computeWordProposals(text, offset, carretColumnIndex, propList);
		} else {
			// the range is empty, no selection in the editor

			// get the region
			final IRegion wordRegion = DocumentHelper.getRegionExpandedBackwards(document, offset,
					DocumentHelper.getDefaultWordDetector());
			final String word = document.get(wordRegion.getOffset(), wordRegion.getLength());
			computeWordProposals(word, offset, carretColumnIndex, propList);
		}
	} catch (final BadLocationException ignore) {
	}
	return propList.toArray(new ICompletionProposal[propList.size()]);
}
 

public static PySelection createPySelectionFromEditor(ITextViewer viewer, ITextSelection textSelection) {
    return new PySelection(viewer.getDocument(), new CoreTextSelection(
            viewer.getDocument(), textSelection.getOffset(), textSelection.getLength()));
}
 

@Override
public IHyperlink[] detectHyperlinks(ITextViewer textViewer, IRegion region, boolean canShowMultipleHyperlinks) {
	IDocument document = textViewer.getDocument();
	int offset = region.getOffset();

	// extract relevant characters
	IRegion lineRegion;
	String candidate;
	try {
		lineRegion = document.getLineInformationOfOffset(offset);
		candidate = document.get(lineRegion.getOffset(), lineRegion.getLength());
	} catch (BadLocationException ex) {
		return null;
	}

	Matcher matcher = JSStackTraceLocationText.JAVASCRIPT_STRACKTRACE_LOCATION_PATTERN.matcher(candidate);
	List<IHyperlink> links = new ArrayList<>();
	while (matcher.find()) {
		JSStackTraceLocationText generatedLocation = new JSStackTraceLocationText(matcher);

		IRegion linkRegion = new Region(
				lineRegion.getOffset() + matcher.start(),
				matcher.end() - matcher.start());

		// generatedLocation.fileName.length());
		JSStackTraceLocationText originalLocation = retrieveOriginal(generatedLocation);
		if (originalLocation != null) { // prefer original location (e.g. n4js)
			links.add(new TestResultHyperlink(linkRegion, originalLocation));
			if (!canShowMultipleHyperlinks) { // and do not show any other in case of single hyper links
				break;
			}
		}
		links.add(new TestResultHyperlink(linkRegion, generatedLocation));
		if (!canShowMultipleHyperlinks) {
			break;
		}

	}
	if (links.isEmpty()) {
		return null;
	}

	IHyperlink[] hyperlinks = new IHyperlink[links.size()];
	links.toArray(hyperlinks);
	return hyperlinks;
}
 

public IStatus run(IProgressMonitor progressMonitor) {
	fProgressMonitor = progressMonitor;

	if (isCanceled()) {
		if (LinkedModeModel.hasInstalledModel(fDocument)) {
			// Template completion applied, remove occurrences
			removeOccurrenceAnnotations();
		}
		return Status.CANCEL_STATUS;
	}
	ITextViewer textViewer = getViewer();
	if (textViewer == null)
		return Status.CANCEL_STATUS;

	IDocument document = textViewer.getDocument();
	if (document == null)
		return Status.CANCEL_STATUS;

	IAnnotationModel annotationModel = getAnnotationModel();
	if (annotationModel == null)
		return Status.CANCEL_STATUS;

	// Add occurrence annotations
	int length = fPositions.length;
	Map annotationMap = new HashMap(length);
	for (int i = 0; i < length; i++) {

		if (isCanceled())
			return Status.CANCEL_STATUS;

		String message;
		Position position = fPositions[i];

		// Create & add annotation
		try {
			message = document.get(position.offset, position.length);
		} catch (BadLocationException ex) {
			// Skip this match
			continue;
		}
		annotationMap.put(new Annotation("org.eclipse.wst.jsdt.ui.occurrences", false, message), //$NON-NLS-1$
				position);
	}

	if (isCanceled())
		return Status.CANCEL_STATUS;

	synchronized (getLockObject(annotationModel)) {
		if (annotationModel instanceof IAnnotationModelExtension) {
			((IAnnotationModelExtension) annotationModel).replaceAnnotations(fOccurrenceAnnotations,
					annotationMap);
		} else {
			removeOccurrenceAnnotations();
			Iterator iter = annotationMap.entrySet().iterator();
			while (iter.hasNext()) {
				Map.Entry mapEntry = (Map.Entry) iter.next();
				annotationModel.addAnnotation((Annotation) mapEntry.getKey(), (Position) mapEntry.getValue());
			}
		}
		fOccurrenceAnnotations = (Annotation[]) annotationMap.keySet()
				.toArray(new Annotation[annotationMap.keySet().size()]);
	}

	return Status.OK_STATUS;
}
 

protected BaseElement getMatchingElement(ITextViewer textViewer, IRegion hoverRegion, HTMLElementNode node)
{
	// Hover over start tag?
	IRange elementNameRange = node.getNameNode().getNameRange();
	if (!elementNameRange.contains(hoverRegion.getOffset()))
	{
		return null;
	}

	// Check if we're hovering over the tag/element name
	try
	{
		IDocument doc = textViewer.getDocument();
		String openTagContent = doc.get(elementNameRange.getStartingOffset(), elementNameRange.getLength());
		int index = openTagContent.indexOf(node.getName());
		IRange tagNameRange = new Range(elementNameRange.getStartingOffset() + index,
				elementNameRange.getStartingOffset() + index + node.getName().length());

		if (tagNameRange.contains(hoverRegion.getOffset()))
		{
			return new HTMLIndexQueryHelper().getElement(node.getElementName().toLowerCase());
		}
	}
	catch (BadLocationException e)
	{
		// ignore
	}

	// Are we hovering over an attribute?
	IParseNodeAttribute attr = node.getAttributeAtOffset(hoverRegion.getOffset());
	if (attr == null)
	{
		return null;
	}

	// Are we over the attribute name?
	IRange nameRange = attr.getNameRange();
	if (nameRange != null && nameRange.contains(hoverRegion.getOffset()))
	{
		return new HTMLIndexQueryHelper().getAttribute(node.getElementName().toLowerCase(), attr.getName());
	}

	// We must be hovering over empty space, or attribute value, show no hover
	return null;
}
 

public void apply(ITextViewer viewer, char trigger, int stateMask, int offset)
{
	try
	{
		IDocument document = viewer.getDocument();
		// Handle wrapping in quotes if necessary
		char prevChar = _replacementOffset > 0 ? document.getChar(_replacementOffset - 1) : ' ';
		char quote = '"';
		switch (prevChar)
		{
			case '\'':
				quote = '\'';
				break;
			case '"':
				// We're fine
				break;

			default:
				if (addLeading)
				{
					// Add wrapping quotes
					_replacementString = "\"" + _replacementString; //$NON-NLS-1$
					_cursorPosition++;
				}
				break;
		}
		if (addTrailing)
		{
			// handle adding trailing space if necessary
			int nextCharIndex = _replacementOffset + _replacementLength;
			if (nextCharIndex >= document.getLength())
			{
				// Add a close quote when we're against the EOF
				_replacementString += quote;
				_cursorPosition++;
			}
			else
			{
				char nextChar = document.getChar(nextCharIndex);
				switch (nextChar)
				{
					case ' ':
					case '\t':
					case '\r':
					case '\n':
					case '\f':
						// add close quote
						_replacementString += quote;
						_cursorPosition++;
						break;

					default:
						if (addEndQuote(nextChar))
						{
							// Add a close quote and then a space
							_replacementString += quote + " "; //$NON-NLS-1$
							_cursorPosition += 2;
						}
						break;
				}
			}
		}

	}
	catch (BadLocationException e)
	{
		// ignore
	}
	super.apply(viewer, trigger, stateMask, offset);
}
 

@Override
public void runWithEvent(Event event) {
	ITextViewer viewer = getTextViewer();
	if (viewer == null)
		return;

	if (!canModifyViewer())
		return;

	// get involved objects

	IDocument document= viewer.getDocument();
	if (document == null)
		return;

	StyledText widget= viewer.getTextWidget();
	if (widget == null)
		return;

	// get selection
	ITextSelection sel= (ITextSelection) viewer.getSelectionProvider().getSelection();
	if (sel.isEmpty())
		return;

	ITextSelection skippedLine= getSkippedLine(document, sel);
	if (skippedLine == null)
		return;

	try {

		ITextSelection movingArea= getMovingSelection(document, sel, viewer);

		// if either the skipped line or the moving lines are outside the widget's
		// visible area, bail out
		if (!containedByVisibleRegion(movingArea, viewer) || !containedByVisibleRegion(skippedLine, viewer))
			return;

		// get the content to be moved around: the moving (selected) area and the skipped line
		String moving= movingArea.getText();
		String skipped= skippedLine.getText();
		if (moving == null || skipped == null || document.getLength() == 0)
			return;

		String delim;
		String insertion;
		int offset, deviation;
		if (fUpwards) {
			delim= document.getLineDelimiter(skippedLine.getEndLine());
			if (fCopy) {
				delim= TextUtilities.getDefaultLineDelimiter(document);
				insertion= moving + delim;
				offset= movingArea.getOffset();
				deviation= 0;
			} else {
				Assert.isNotNull(delim);
				insertion= moving + delim + skipped;
				offset= skippedLine.getOffset();
				deviation= -skippedLine.getLength() - delim.length();
			}
		} else {
			delim= document.getLineDelimiter(movingArea.getEndLine());
			if (fCopy) {
				if (delim == null) {
					delim= TextUtilities.getDefaultLineDelimiter(document);
					insertion= delim + moving;
				} else {
					insertion= moving + delim;
				}
				offset= skippedLine.getOffset();
				deviation= movingArea.getLength() + delim.length();
			} else {
				Assert.isNotNull(delim);
				insertion= skipped + delim + moving;
				offset= movingArea.getOffset();
				deviation= skipped.length() + delim.length();
			}
		}

		// modify the document
		beginCompoundEdit();
		if (fCopy) {
			document.replace(offset, 0, insertion);
		} else {
			document.replace(offset, insertion.length(), insertion);
		}

		// move the selection along
		int selOffset= movingArea.getOffset() + deviation;
		int selLength= movingArea.getLength() + (fAddDelimiter ? delim.length() : 0);
		if (! (viewer instanceof ITextViewerExtension5))
			selLength= Math.min(selLength, viewer.getVisibleRegion().getOffset() + viewer.getVisibleRegion().getLength() - selOffset);
		else {
			// TODO need to check what is necessary in the projection case
		}
		selectAndReveal(viewer, selOffset, selLength);
	} catch (BadLocationException x) {
		// won't happen without concurrent modification - bail out
		return;
	}
}
 

@Override
public ICompletionProposal[] computeCompletionProposals(ITextViewer viewer, int documentOffset) {
    if (!(viewer.getDocument() instanceof JsonDocument)) {
        return super.computeCompletionProposals(viewer, documentOffset);
    }

    maybeSwitchScope(documentOffset);

    final JsonDocument document = (JsonDocument) viewer.getDocument();
    final ITextSelection selection = (ITextSelection) viewer.getSelectionProvider().getSelection();
    int line = 0, lineOffset = 0, column = 0;
    try {
        line = document.getLineOfOffset(documentOffset);
        lineOffset = document.getLineOffset(line);
        column = selection.getOffset() - lineOffset;
    } catch (BadLocationException e) {
    }
    
    final String prefix = extractPrefix(viewer, documentOffset);
    // we have to remove the length of
    // the prefix to obtain the correct
    // column to resolve the path
    if (!prefix.isEmpty()) {
        column -= prefix.length();
    }

    currentModel = document.getModel(documentOffset - prefix.length());
    currentPath = currentModel.getPath(line, column);
    isRefCompletion = referenceProposalProvider.canProvideProposal(currentModel, currentPath);

    Collection<ProposalDescriptor> kaizenProposals;
    if (isRefCompletion) {
        updateStatus();
        kaizenProposals = referenceProposalProvider.getProposals(currentPath, document, currentScope);
    } else {
        clearStatus();
        kaizenProposals = proposalProvider.getProposals(currentPath, currentModel, prefix);
    }
   
    final Collection<ICompletionProposal> proposals = getCompletionProposals(kaizenProposals, prefix, documentOffset, selection.getText());
    // compute template proposals only if not trying to propose references
    if (!isRefCompletion) {
        List<ICompletionProposal> templateProposals = filterTemplateProposals(
                super.computeCompletionProposals(viewer, documentOffset), prefix);
        if (!templateProposals.isEmpty()) {
            proposals.addAll(templateProposals);
        }
    }

    return proposals.toArray(new ICompletionProposal[proposals.size()]);
}
 

@Override
public IHyperlink[] detectHyperlinks(ITextViewer textViewer, IRegion region, boolean canShowMultipleHyperlinks) {
	
	IDocument document = textViewer.getDocument();
	int offset = region.getOffset();

	// extract relevant characters
	IRegion lineRegion;
	String candidate;
	try {
		lineRegion = document.getLineInformationOfOffset(offset);
		candidate = document.get(lineRegion.getOffset(), lineRegion.getLength());
	}
	catch (BadLocationException ex) {
		return null;
	}
	
	String upperCandidate = candidate.toUpperCase(Locale.ENGLISH);
	if (upperCandidate.startsWith("INSERT") || upperCandidate.startsWith("REMOVE") || upperCandidate.startsWith("UPDATE")) {
		// look for keyword
		if (allTypeNames == null) {
			allTypeNames = Activator.getDefault().getAllTypeNames();
		}
	
		String headerPlusType = candidate.substring(0, candidate.indexOf(";"));
		String typeName = headerPlusType.substring(candidate.indexOf(" ") + 1, headerPlusType.length());
		if (allTypeNames.contains(typeName)) {
	
			int index = candidate.indexOf(typeName);
			if (index != -1) {

				// detect region containing keyword
				IRegion targetRegion = new Region(lineRegion.getOffset() + index, typeName.length());
				if ((targetRegion.getOffset() <= offset) && ((targetRegion.getOffset() + targetRegion.getLength()) > offset)) {
					try {
						return new IHyperlink[] { new ImpexTypeHyperlink(targetRegion, document.get(targetRegion.getOffset(), targetRegion.getLength())) };
					}
					catch (BadLocationException e) {
						Activator.logError("BadLocationException", e);
					}
				}
			}
		}
	}

	return null;
}