com.intellij.psi.PsiInvalidElementAccessException#com.intellij.openapi.fileTypes.FileType源码实例Demo

@Nullable
private static EditorHighlighter createEditorHighlighter(@Nullable Project project, @Nonnull DocumentContent content) {
  FileType type = content.getContentType();
  VirtualFile file = content.getHighlightFile();
  Language language = content.getUserData(DiffUserDataKeys.LANGUAGE);

  EditorHighlighterFactory highlighterFactory = EditorHighlighterFactory.getInstance();
  if (language != null) {
    SyntaxHighlighter syntaxHighlighter = SyntaxHighlighterFactory.getSyntaxHighlighter(language, project, file);
    return highlighterFactory.createEditorHighlighter(syntaxHighlighter, EditorColorsManager.getInstance().getGlobalScheme());
  }
  if (file != null) {
    if ((type == null || type == PlainTextFileType.INSTANCE) || file.getFileType() == type || file instanceof LightVirtualFile) {
      return highlighterFactory.createEditorHighlighter(project, file);
    }
  }
  if (type != null) {
    return highlighterFactory.createEditorHighlighter(project, type);
  }
  return null;
}
 

/**
 * {@inheritDoc}
 */
@Override
public int compare(final FileType o1, final FileType o2) {
  if (o1 == o2) {
    return 0;
  }
  if (o1 == UnknownFileType.INSTANCE) {
    return 1;
  }
  if (o2 == UnknownFileType.INSTANCE) {
    return -1;
  }
  if (o1.isBinary() && !o2.isBinary()) {
    return 1;
  }
  if (!o1.isBinary() && o2.isBinary()) {
    return -1;
  }
  return o1.getName().compareToIgnoreCase(o2.getName());
}
 

private static boolean isInStringLiteral(@Nonnull Editor editor, @Nonnull DataContext dataContext, int offset) {
  Language language = EnterHandler.getLanguage(dataContext);
  if (offset > 0 && language != null) {
    QuoteHandler quoteHandler = TypedHandler.getLanguageQuoteHandler(language);
    if (quoteHandler == null) {
      FileType fileType = language.getAssociatedFileType();
      quoteHandler = fileType != null ? TypedHandler.getQuoteHandlerForType(fileType) : null;
    }
    if (quoteHandler != null) {
      EditorHighlighter highlighter = ((EditorEx)editor).getHighlighter();
      HighlighterIterator iterator = highlighter.createIterator(offset - 1);
      return StringEscapesTokenTypes.STRING_LITERAL_ESCAPES.contains(iterator.getTokenType()) || quoteHandler.isInsideLiteral(iterator);
    }
  }
  return false;
}
 

@Nonnull
@Override
public MergeRequest createMergeRequest(@Nullable Project project,
                                       @Nullable FileType fileType,
                                       @Nonnull Document outputDocument,
                                       @Nonnull List<String> textContents,
                                       @Nullable String title,
                                       @Nonnull List<String> titles,
                                       @Nullable Consumer<MergeResult> applyCallback) throws InvalidDiffRequestException {
  if (textContents.size() != 3) throw new IllegalArgumentException();
  if (titles.size() != 3) throw new IllegalArgumentException();

  if (!DiffUtil.canMakeWritable(outputDocument)) throw new InvalidDiffRequestException("Output is read only");

  DocumentContent outputContent = myContentFactory.create(project, outputDocument, fileType);
  CharSequence originalContent = outputDocument.getImmutableCharSequence();

  List<DocumentContent> contents = new ArrayList<>(3);
  for (String text : textContents) {
    contents.add(myContentFactory.create(project, text, fileType));
  }

  return new TextMergeRequestImpl(project, outputContent, originalContent, contents, title, titles, applyCallback);
}
 

@Override
public void selectionChanged(@NotNull FileEditorManagerEvent event) {
    VirtualFile newFile = event.getNewFile();
    if (newFile != null) {
        FileType fileType = newFile.getFileType();
        if (FileHelper.isReason(fileType) || FileHelper.isOCaml(fileType)) {
            // On tab change, we redo the background compilation
            Document document = FileDocumentManager.getInstance().getDocument(newFile);
            InsightUpdateQueue insightUpdateQueue = document == null ? null : document.getUserData(INSIGHT_QUEUE);
            if (insightUpdateQueue != null) {
                insightUpdateQueue.queue(m_project, document);
            }
            // and refresh inferred types
            InferredTypesService.queryForSelectedTextEditor(m_project);
        }
    }
}
 

@Nonnull
private static DocumentContent createImpl(@javax.annotation.Nullable Project project,
                                          @Nonnull String text,
                                          @Nullable FileType fileType,
                                          @Nullable String fileName,
                                          @Nullable VirtualFile highlightFile,
                                          @javax.annotation.Nullable Charset charset,
                                          @javax.annotation.Nullable Boolean bom,
                                          boolean respectLineSeparators,
                                          boolean readOnly) {
  if (UnknownFileType.INSTANCE == fileType) fileType = PlainTextFileType.INSTANCE;

  // TODO: detect invalid (different across the file) separators ?
  LineSeparator separator = respectLineSeparators ? StringUtil.detectSeparators(text) : null;
  String correctedContent = StringUtil.convertLineSeparators(text);

  Document document = createDocument(project, correctedContent, fileType, fileName, readOnly);
  DocumentContent content = new DocumentContentImpl(project, document, fileType, highlightFile, separator, charset, bom);

  if (fileName != null) content.putUserData(DiffUserDataKeysEx.FILE_NAME, fileName);

  return content;
}
 

@Nonnull
public static FileType substituteFileType(VirtualFile file, @Nonnull FileType fileType, Project project) {
  if (project == null) {
    return fileType;
  }
  if (fileType instanceof LanguageFileType) {
    final Language language = ((LanguageFileType)fileType).getLanguage();
    final Language substitutedLanguage = LanguageSubstitutors.INSTANCE.substituteLanguage(language, file, project);
    LanguageFileType substFileType = substitutedLanguage.getAssociatedFileType();
    if (!substitutedLanguage.equals(language) && substFileType != null) {
      return new SubstitutedFileType(fileType, substFileType, substitutedLanguage);
    }
  }

  return fileType;
}
 

@Nonnull
private static DocumentContent createFromBytesImpl(@Nullable Project project,
                                                   @Nonnull byte[] content,
                                                   @Nonnull FileType fileType,
                                                   @Nonnull String fileName,
                                                   @javax.annotation.Nullable VirtualFile highlightFile,
                                                   @Nonnull Charset charset) {
  Charset bomCharset = CharsetToolkit.guessFromBOM(content);
  boolean isBOM = bomCharset != null;
  if (isBOM) charset = bomCharset;

  boolean malformedContent = false;
  String text = CharsetToolkit.tryDecodeString(content, charset);

  LineSeparator separator = StringUtil.detectSeparators(text);
  String correctedContent = StringUtil.convertLineSeparators(text);

  DocumentContent documentContent = createImpl(project, correctedContent, fileType, fileName, highlightFile, charset, isBOM, true, true);

  if (malformedContent) {
    String notificationText = "Content was decoded with errors (using " + "'" + charset.name() + "' charset)";
    DiffUtil.addNotification(DiffNotifications.createNotification(notificationText, LightColors.RED), documentContent);
  }

  return documentContent;
}
 

@Nullable
private DiffTool chooseTool(DiffRequest data) {
  final DiffContent[] contents = data.getContents();

  if (contents.length == 2) {
    final FileType type1 = contents[0].getContentType();
    final FileType type2 = contents[1].getContentType();
    if (type1 == type2 && type1 instanceof UIBasedFileType) {
      return BinaryDiffTool.INSTANCE;
    }

    //todo[kb] register or not this instance in common diff tools ?
    if (type1 == type2 && type1 instanceof ArchiveFileType) {
      return ArchiveDiffTool.INSTANCE;
    }
  }

  for (DiffTool tool : myTools) {
    if (tool.canShow(data)) return tool;
  }
  return null;
}
 

@Override
public void update(AnActionEvent e) {
  DataContext dataContext = e.getDataContext();
  final VirtualFile[] selectedFiles = dataContext.getData(PlatformDataKeys.VIRTUAL_FILE_ARRAY);
  final Presentation presentation = e.getPresentation();
  final EnforcedPlainTextFileTypeManager typeManager = EnforcedPlainTextFileTypeManager.getInstance();
  presentation.setVisible(false);
  if (typeManager == null || selectedFiles == null || selectedFiles.length == 0) {
    return;
  }
  FileType originalType = null;
  for (VirtualFile file : selectedFiles) {
    if (typeManager.isMarkedAsPlainText(file)) {
      FileType fileType = FileTypeManager.getInstance().getFileTypeByFileName(file.getName());
      if (originalType == null) {
        originalType = fileType;
      }
      else if (fileType != originalType) {
        return;
      }
    }
    else {
      return;
    }
  }
  if (originalType == null) return;
  presentation.setVisible(true);
  presentation.setText(ActionsBundle.actionText("MarkAsOriginalTypeAction") + " " + originalType.getName());
  presentation.setIcon(originalType.getIcon());
}
 

@Override
@Nonnull
protected List<FileType> getAllFilterValues() {
  List<FileType> elements = new ArrayList<>();
  ContainerUtil.addAll(elements, FileTypeManager.getInstance().getRegisteredFileTypes());
  Collections.sort(elements, FileTypeComparator.INSTANCE);
  return elements;
}
 

public NameSuggestionsField(final String[] suggestedNames, final Project project, final FileType fileType, @Nullable final Editor editor) {
  this(suggestedNames, project, fileType);
  if (editor == null) return;
  // later here because EditorTextField creates Editor during addNotify()
  final Runnable selectionRunnable = new Runnable() {
    @Override
    public void run() {
      final int offset = editor.getCaretModel().getOffset();
      List<TextRange> ranges = new ArrayList<TextRange>();
      SelectWordUtil.addWordSelection(editor.getSettings().isCamelWords(), editor.getDocument().getCharsSequence(), offset, ranges);
      Editor myEditor = getEditor();
      if (myEditor == null) return;
      for (TextRange wordRange : ranges) {
        String word = editor.getDocument().getText(wordRange);
        if (!word.equals(getEnteredName())) continue;
        final SelectionModel selectionModel = editor.getSelectionModel();
        myEditor.getSelectionModel().removeSelection();
        final int wordRangeStartOffset = wordRange.getStartOffset();
        int myOffset = offset - wordRangeStartOffset;
        myEditor.getCaretModel().moveToOffset(myOffset);
        TextRange selected = new TextRange(Math.max(0, selectionModel.getSelectionStart() - wordRangeStartOffset),
                                           Math.max(0, selectionModel.getSelectionEnd() - wordRangeStartOffset));
        selected = selected.intersection(new TextRange(0, myEditor.getDocument().getTextLength()));
        if (selectionModel.hasSelection() && selected != null && !selected.isEmpty()) {
          myEditor.getSelectionModel().setSelection(selected.getStartOffset(), selected.getEndOffset());
        }
        else if (shouldSelectAll()) {
          myEditor.getSelectionModel().setSelection(0, myEditor.getDocument().getTextLength());
        }
        break;
      }
    }
  };
  SwingUtilities.invokeLater(selectionRunnable);
}
 

private void applyCodeStyleSettings(final List<OutPair> outPairs, final CodeStyleSettings codeStyleSettings,
                                    final VirtualFile file) {
    // Apply indent options
    final String indentSize = Utils.configValueForKey(outPairs, indentSizeKey);
    final String tabWidth = Utils.configValueForKey(outPairs, tabWidthKey);
    final String indentStyle = Utils.configValueForKey(outPairs, indentStyleKey);
    final FileType fileType = file.getFileType();
    final Language language = fileType instanceof LanguageFileType ? ((LanguageFileType)fileType).getLanguage() :
        PlainTextLanguage.INSTANCE;
    final CommonCodeStyleSettings commonSettings = codeStyleSettings.getCommonSettings(language);
    final CommonCodeStyleSettings.IndentOptions indentOptions = commonSettings.getIndentOptions();
    applyIndentOptions(indentOptions, indentSize, tabWidth, indentStyle, file.getCanonicalPath());
}
 

/**
 * TODO we need a similar method for generic IDocument (enabling non-IFiles)
 *
 * @param file
 * @param request
 * @return
 * @throws IOException
 * @noreference This method is currently internal and should only be referenced
 * for testing
 */
@Nonnull
public Collection<LanguageServerWrapper> getLSWrappers(@Nonnull VirtualFile file,
                                                              @Nullable Predicate<ServerCapabilities> request) throws IOException {
    LinkedHashSet<LanguageServerWrapper> res = new LinkedHashSet<>();
    Module project = LSPIJUtils.getProject(file);
    if (project == null) {
        return res;
    }

    res.addAll(getMatchingStartedWrappers(file, request));

    // look for running language servers via content-type
    Queue<FileType> contentTypes = new LinkedList<>();
    Set<FileType> addedContentTypes = new HashSet<>();
    contentTypes.addAll(LSPIJUtils.getFileContentTypes(file));
    addedContentTypes.addAll(contentTypes);

    while (!contentTypes.isEmpty()) {
        FileType contentType = contentTypes.poll();
        if (contentType == null) {
            continue;
        }
        for (ContentTypeToLanguageServerDefinition mapping : LanguageServersRegistry.getInstance().findProviderFor(contentType)) {
            if (mapping != null && mapping.getValue() != null && mapping.isEnabled()) {
                LanguageServerWrapper wrapper = getLSWrapperForConnection(project, mapping.getValue(), LSPIJUtils.toUri(file));
                if (request == null
                        || wrapper.getServerCapabilities() == null /* null check is workaround for https://github.com/TypeFox/ls-api/issues/47 */
                        || request.test(wrapper.getServerCapabilities())) {
                    res.add(wrapper);
                }
            }
        }
    }
    return res;
}
 

@Nonnull
private static DetectResult detectHardCharset(@Nonnull VirtualFile virtualFile, @Nonnull byte[] content, int length, @Nonnull FileType fileType) {
  String charsetName = fileType.getCharset(virtualFile, content);
  DetectResult guessed = guessFromContent(virtualFile, content, length);
  Charset hardCodedCharset = charsetName == null ? guessed.hardCodedCharset : CharsetToolkit.forName(charsetName);

  if (hardCodedCharset == null && guessed.guessed == CharsetToolkit.GuessedEncoding.VALID_UTF8) {
    return new DetectResult(StandardCharsets.UTF_8, guessed.guessed, guessed.BOM);
  }
  return new DetectResult(hardCodedCharset, guessed.guessed, guessed.BOM);
}
 

@Nullable
private static CompletionData getCompletionDataByFileType(FileType fileType) {
  for (CompletionDataEP ep : CompletionDataEP.EP_NAME.getExtensionList()) {
    if (ep.fileType.equals(fileType.getName())) {
      return ep.getHandler();
    }
  }
  return null;
}
 

@Override
@Nonnull
public VirtualFile[] getFiles(final FileType fileType, final boolean inSourceOnly) {
  final List<VirtualFile> files = new ArrayList<VirtualFile>();
  final FileIndex[] fileIndices = getFileIndices();
  for (final FileIndex fileIndex : fileIndices) {
    fileIndex.iterateContent(new ModuleRootCompilerContentIterator(fileType, files));
  }
  return VfsUtil.toVirtualFileArray(files);
}
 

@Override
public Result beforeCharTyped(final char charTyped, final Project project, final Editor editor, final PsiFile file, final FileType fileType) {
  // TODO[oleg] remove this hack when API changes
  if (myReplacedTextRange != null) {
    if (myReplacedTextRange.getEndOffset() <= editor.getDocument().getTextLength()) {
      if (myRestoreStickySelection && editor instanceof EditorEx) {
        EditorEx editorEx = (EditorEx)editor;
        CaretModel caretModel = editorEx.getCaretModel();
        caretModel.moveToOffset(myLtrSelection ? myReplacedTextRange.getStartOffset() : myReplacedTextRange.getEndOffset());
        editorEx.setStickySelection(true);
        caretModel.moveToOffset(myLtrSelection ? myReplacedTextRange.getEndOffset() : myReplacedTextRange.getStartOffset());
      }
      else {
        if (myLtrSelection || editor instanceof EditorWindow) {
          editor.getSelectionModel().setSelection(myReplacedTextRange.getStartOffset(), myReplacedTextRange.getEndOffset());
        }
        else {
          editor.getSelectionModel().setSelection(myReplacedTextRange.getEndOffset(), myReplacedTextRange.getStartOffset());
        }
        if (Registry.is("editor.smarterSelectionQuoting")) {
          editor.getCaretModel().moveToOffset(myLtrSelection ? myReplacedTextRange.getEndOffset() : myReplacedTextRange.getStartOffset());
        }
      }
    }
    myReplacedTextRange = null;
    return Result.STOP;
  }
  return Result.CONTINUE;
}
 

public CombinedEditorData(@Nonnull CharSequence text,
                          @Nullable EditorHighlighter highlighter,
                          @Nullable UnifiedEditorRangeHighlighter rangeHighlighter,
                          @Nullable FileType fileType,
                          @Nonnull TIntFunction convertor1,
                          @Nonnull TIntFunction convertor2) {
  myText = text;
  myHighlighter = highlighter;
  myRangeHighlighter = rangeHighlighter;
  myFileType = fileType;
  myLineConvertor1 = convertor1;
  myLineConvertor2 = convertor2;
}
 

@SuppressWarnings({"HardCodedStringLiteral"})
private void writeString(Writer writer, CharSequence charArray, int start, int length, FileType fileType) throws IOException {
  for(int i=start; i<start+length; i++) {
    char c = charArray.charAt(i);
    if(c=='<') {
      writeChar(writer, "&lt;");
    }
    else if(c=='>') {
      writeChar(writer, "&gt;");
    }
    else if (c=='&') {
      writeChar(writer, "&amp;");
    }
    else if (c=='\"') {
      writeChar(writer, "&quot;");
    }
    else if (c == '\t') {
      int tabSize = CodeStyleSettingsManager.getSettings(myProject).getTabSize(fileType);
      if (tabSize <= 0) tabSize = 1;
      int nSpaces = tabSize - myColumn % tabSize;
      for (int j = 0; j < nSpaces; j++) {
        writeChar(writer, " ");
      }
    }
    else if (c == '\n' || c == '\r') {
      if (c == '\r' && i+1 < start+length && charArray.charAt(i+1) == '\n') {
        writeChar(writer, " \r");
        i++;
      }
      else if (c == '\n') {
        writeChar(writer, " ");
      }
      writeLineNumber(writer);
    }
    else {
      writeChar(writer, String.valueOf(c));
    }
  }
}
 

@Override
@RequiredUIAccess
public Result beforeCharTyped(char c, Project project, Editor editor, PsiFile file, FileType fileType)
{
	if(!(file instanceof CSharpFile))
	{
		return Result.CONTINUE;
	}

	if(c == '.')
	{
		if(handleDotAtPointerType(editor, file))
		{
			return Result.STOP;
		}

		autoPopupMemberLookup(project, editor);
	}

	if(c == '#')
	{
		autoPopupMemberLookup(project, editor);
	}

	if(c == ';')
	{
		if(handleSemicolon(editor))
		{
			return Result.STOP;
		}
	}

	return Result.CONTINUE;
}
 

@Override
@Nonnull
public PsiFile createFileFromText(@Nonnull String name, @Nonnull String text) {
  FileType type = FileTypeRegistry.getInstance().getFileTypeByFileName(name);
  if (type.isBinary()) {
    throw new RuntimeException("Cannot create binary files from text: name " + name + ", file type " + type);
  }

  return createFileFromText(name, type, text);
}
 

private void configureByText(final String usageText, FileType fileType) {
  Document document = myEditor.getDocument();
  String text = StringUtil.convertLineSeparators(usageText);
  document.replaceString(0, document.getTextLength(), text);
  final EditorColorsScheme scheme = EditorColorsManager.getInstance().getGlobalScheme();
  myEditor.setHighlighter(EditorHighlighterFactory.getInstance().createEditorHighlighter(fileType, scheme, null));
  setupSpots(document);
}
 

@Override
public EditorHighlighter getEditorHighlighter(@Nullable Project project,
                                              @NotNull FileType type,
                                              @Nullable VirtualFile file,
                                              @NotNull EditorColorsScheme scheme) {
    return new FluidTemplateHighlighter(project, file, scheme);
}
 

public Self withFileType(final ElementPattern<? extends FileType> fileTypePattern) {
  return with(new PatternCondition<T>("withFileType") {
    @Override
    public boolean accepts(@Nonnull T file, ProcessingContext context) {
      return fileTypePattern.accepts(file.getFileType(), context);
    }
  });
}
 

@Nonnull
public FileType getFileType(@Nonnull String fileName) {
  return FileTypeManager.getInstance().getFileTypeByFileName(fileName);
}
 

private static boolean isBinaryWithoutDecompiler(VirtualFile file) {
  final FileType ft = file.getFileType();
  return ft.isBinary() && BinaryFileTypeDecompilers.INSTANCE.forFileType(ft) == null;
}
 

/**
 * @deprecated Use {@link #getIndent(PsiFile, ASTNode)}
 */
@Deprecated
public final int getIndent(Project project, FileType fileType, ASTNode element) {
  return getIndent(getFile(element), element);
}
 

@Override
public boolean isLBraceToken(final HighlighterIterator iterator, final CharSequence fileText, final FileType fileType) {
  return false;
}
 

@Nullable 
public FileType getContentType() {
  FileType type = myFile.getFileType();
  return isUnknown(type) ? myType : type;
}