public static void clearCaches(
     @NotNull PsiFile injected, @NotNull DocumentWindowImpl documentWindow) {
   VirtualFileWindowImpl virtualFile = (VirtualFileWindowImpl) injected.getVirtualFile();
   PsiManagerEx psiManagerEx = (PsiManagerEx) injected.getManager();
   if (psiManagerEx.getProject().isDisposed()) return;
   psiManagerEx.getFileManager().setViewProvider(virtualFile, null);
   PsiElement context =
       InjectedLanguageManager.getInstance(injected.getProject()).getInjectionHost(injected);
   PsiFile hostFile;
   if (context != null) {
     hostFile = context.getContainingFile();
   } else {
     VirtualFile delegate = virtualFile.getDelegate();
     hostFile = delegate.isValid() ? psiManagerEx.findFile(delegate) : null;
   }
   if (hostFile != null) {
     // modification of cachedInjectedDocuments must be under PsiLock
     synchronized (PsiLock.LOCK) {
       List<DocumentWindow> cachedInjectedDocuments = getCachedInjectedDocuments(hostFile);
       for (int i = cachedInjectedDocuments.size() - 1; i >= 0; i--) {
         DocumentWindow cachedInjectedDocument = cachedInjectedDocuments.get(i);
         if (cachedInjectedDocument == documentWindow) {
           cachedInjectedDocuments.remove(i);
         }
       }
     }
   }
 }
  public static String getUnescapedText(
      PsiFile file,
      @Nullable final PsiElement startElement,
      @Nullable final PsiElement endElement) {
    final InjectedLanguageManager manager = InjectedLanguageManager.getInstance(file.getProject());
    if (manager.getInjectionHost(file) == null) {
      return file.getText()
          .substring(
              startElement == null ? 0 : startElement.getTextRange().getStartOffset(),
              endElement == null
                  ? file.getTextLength()
                  : endElement.getTextRange().getStartOffset());
    }
    final StringBuilder sb = new StringBuilder();
    file.accept(
        new PsiRecursiveElementWalkingVisitor() {

          Boolean myState = startElement == null ? Boolean.TRUE : null;

          @Override
          public void visitElement(PsiElement element) {
            if (element == startElement) myState = Boolean.TRUE;
            if (element == endElement) myState = Boolean.FALSE;
            if (Boolean.FALSE == myState) return;
            if (Boolean.TRUE == myState && element.getFirstChild() == null) {
              sb.append(getUnescapedLeafText(element, false));
            } else {
              super.visitElement(element);
            }
          }
        });
    return sb.toString();
  }
  // returns (injected psi, leaf element at the offset, language of the leaf element)
  // since findElementAt() is expensive, we trying to reuse its result
  @NotNull
  private static Trinity<PsiElement, PsiElement, Language> tryOffset(
      @NotNull PsiFile hostFile, final int offset, @NotNull PsiDocumentManager documentManager) {
    FileViewProvider provider = hostFile.getViewProvider();
    Language leafLanguage = null;
    PsiElement leafElement = null;
    for (Language language : provider.getLanguages()) {
      PsiElement element = provider.findElementAt(offset, language);
      if (element != null) {
        if (leafLanguage == null) {
          leafLanguage = language;
          leafElement = element;
        }
        PsiElement injected = findInside(element, hostFile, offset, documentManager);
        if (injected != null) return Trinity.create(injected, element, language);
      }
      // maybe we are at the border between two psi elements, then try to find injection at the end
      // of the left element
      if (offset != 0 && (element == null || element.getTextRange().getStartOffset() == offset)) {
        PsiElement leftElement = provider.findElementAt(offset - 1, language);
        if (leftElement != null && leftElement.getTextRange().getEndOffset() == offset) {
          PsiElement injected = findInside(leftElement, hostFile, offset, documentManager);
          if (injected != null) return Trinity.create(injected, element, language);
        }
      }
    }

    return Trinity.create(null, leafElement, leafLanguage);
  }
  public static void enumerate(
      @NotNull PsiElement host,
      @NotNull PsiFile containingFile,
      boolean probeUp,
      @NotNull PsiLanguageInjectionHost.InjectedPsiVisitor visitor) {
    // do not inject into nonphysical files except during completion
    if (!containingFile.isPhysical() && containingFile.getOriginalFile() == containingFile) {
      final PsiElement context =
          InjectedLanguageManager.getInstance(containingFile.getProject())
              .getInjectionHost(containingFile);
      if (context == null) return;

      final PsiFile file = context.getContainingFile();
      if (file == null || !file.isPhysical() && file.getOriginalFile() == file) return;
    }

    if (containingFile.getViewProvider() instanceof InjectedFileViewProvider)
      return; // no injection inside injection

    PsiElement inTree = loadTree(host, containingFile);
    if (inTree != host) {
      host = inTree;
      containingFile = host.getContainingFile();
    }

    MultiHostRegistrarImpl registrar = probeElementsUp(host, containingFile, probeUp);
    if (registrar == null) {
      return;
    }
    List<Pair<Place, PsiFile>> places = registrar.getResult();
    for (Pair<Place, PsiFile> pair : places) {
      PsiFile injectedPsi = pair.second;
      visitor.visit(injectedPsi, pair.first);
    }
  }
 @Nullable
 public static String getUnescapedLeafText(PsiElement element, boolean strict) {
   String unescaped = element.getCopyableUserData(LeafPatcher.UNESCAPED_TEXT);
   if (unescaped != null) {
     return unescaped;
   }
   if (!strict && element.getFirstChild() == null) {
     return element.getText();
   }
   return null;
 }
 public static PsiFile getTopLevelFile(@NotNull PsiElement element) {
   PsiFile containingFile = element.getContainingFile();
   if (containingFile == null) return null;
   Document document =
       PsiDocumentManager.getInstance(element.getProject()).getCachedDocument(containingFile);
   if (document instanceof DocumentWindow) {
     PsiElement host =
         InjectedLanguageManager.getInstance(containingFile.getProject())
             .getInjectionHost(containingFile);
     if (host != null) containingFile = host.getContainingFile();
   }
   return containingFile;
 }
  public static boolean isInInjectedLanguagePrefixSuffix(@NotNull final PsiElement element) {
    PsiFile injectedFile = element.getContainingFile();
    if (injectedFile == null) return false;
    Project project = injectedFile.getProject();
    InjectedLanguageManager languageManager = InjectedLanguageManager.getInstance(project);
    if (!languageManager.isInjectedFragment(injectedFile)) return false;
    TextRange elementRange = element.getTextRange();
    List<TextRange> editables =
        languageManager.intersectWithAllEditableFragments(injectedFile, elementRange);
    int combinedEdiablesLength = 0;
    for (TextRange editable : editables) {
      combinedEdiablesLength += editable.getLength();
    }

    return combinedEdiablesLength != elementRange.getLength();
  }
 @Nullable
 public static DocumentWindow getDocumentWindow(@NotNull PsiElement element) {
   PsiFile file = element.getContainingFile();
   if (file == null) return null;
   VirtualFile virtualFile = file.getVirtualFile();
   if (virtualFile instanceof VirtualFileWindow)
     return ((VirtualFileWindow) virtualFile).getDocumentWindow();
   return null;
 }
  @NotNull
  static PsiElement loadTree(@NotNull PsiElement host, @NotNull PsiFile containingFile) {
    if (containingFile instanceof DummyHolder) {
      PsiElement context = containingFile.getContext();
      if (context != null) {
        PsiFile topFile = context.getContainingFile();
        topFile.getNode(); // load tree
        TextRange textRange =
            host.getTextRange().shiftRight(context.getTextRange().getStartOffset());

        PsiElement inLoadedTree =
            PsiTreeUtil.findElementOfClassAtRange(
                topFile, textRange.getStartOffset(), textRange.getEndOffset(), host.getClass());
        if (inLoadedTree != null) {
          host = inLoadedTree;
        }
      }
    }
    return host;
  }
  private static MultiHostRegistrarImpl probeElementsUp(
      @NotNull PsiElement element, @NotNull PsiFile hostPsiFile, boolean probeUp) {
    PsiManager psiManager = hostPsiFile.getManager();
    final Project project = psiManager.getProject();
    InjectedLanguageManagerImpl injectedManager =
        InjectedLanguageManagerImpl.getInstanceImpl(project);
    if (injectedManager == null) {
      return null; // for tests
    }
    MultiHostRegistrarImpl registrar = null;
    PsiElement current = element;
    nextParent:
    while (current != null && current != hostPsiFile) {
      ProgressManager.checkCanceled();
      if ("EL".equals(current.getLanguage().getID())) break;
      ParameterizedCachedValue<MultiHostRegistrarImpl, PsiElement> data =
          current.getUserData(INJECTED_PSI);
      if (data == null) {
        registrar =
            InjectedPsiCachedValueProvider.doCompute(
                current, injectedManager, project, hostPsiFile);
      } else {
        registrar = data.getValue(current);
      }

      current = current.getParent(); // cache no injection for current

      if (registrar != null) {
        List<Pair<Place, PsiFile>> places = registrar.getResult();
        // check that injections found intersect with queried element
        TextRange elementRange = element.getTextRange();
        for (Pair<Place, PsiFile> pair : places) {
          Place place = pair.first;
          for (PsiLanguageInjectionHost.Shred shred : place) {
            if (shred.getHost().getTextRange().intersects(elementRange)) {
              if (place.isValid()) break nextParent;
            }
          }
        }
      }
      if (!probeUp) {
        break;
      }
    }

    if (probeUp) {
      // cache only if we walked all parents
      for (PsiElement e = element;
          e != current && e != null && e != hostPsiFile;
          e = e.getParent()) {
        ProgressManager.checkCanceled();
        if (registrar == null) {
          e.putUserData(INJECTED_PSI, null);
        } else {
          ParameterizedCachedValue<MultiHostRegistrarImpl, PsiElement> cachedValue =
              CachedValuesManager.getManager(project)
                  .createParameterizedCachedValue(INJECTED_PSI_PROVIDER, false);

          CachedValueProvider.Result<MultiHostRegistrarImpl> result =
              CachedValueProvider.Result.create(
                  registrar, PsiModificationTracker.MODIFICATION_COUNT, registrar);
          ((PsiParameterizedCachedValue<MultiHostRegistrarImpl, PsiElement>) cachedValue)
              .setValue(result);

          e.putUserData(INJECTED_PSI, cachedValue);
        }
      }
    }
    return registrar;
  }
 @Nullable
 public static PsiFile findInjectedPsiNoCommit(@NotNull PsiFile host, int offset) {
   PsiElement injected = findInjectedElementNoCommit(host, offset);
   return injected == null ? null : injected.getContainingFile();
 }
 public static void enumerate(
     @NotNull PsiElement host, @NotNull PsiLanguageInjectionHost.InjectedPsiVisitor visitor) {
   PsiFile containingFile = host.getContainingFile();
   enumerate(host, containingFile, true, visitor);
 }