| /* |
| * Copyright 2000-2013 JetBrains s.r.o. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package com.intellij.openapi.editor.impl; |
| |
| import com.intellij.lexer.Lexer; |
| import com.intellij.openapi.editor.Document; |
| import com.intellij.openapi.editor.ex.util.LexerEditorHighlighter; |
| import com.intellij.openapi.editor.highlighter.EditorHighlighter; |
| import com.intellij.openapi.editor.highlighter.EditorHighlighterFactory; |
| import com.intellij.openapi.project.Project; |
| import com.intellij.openapi.util.Key; |
| import com.intellij.openapi.vfs.VirtualFile; |
| import com.intellij.psi.PsiDocumentManager; |
| import com.intellij.psi.PsiFile; |
| import com.intellij.psi.PsiManager; |
| import com.intellij.psi.impl.cache.impl.id.PlatformIdTableBuilding; |
| import com.intellij.psi.impl.search.LexerEditorHighlighterLexer; |
| import com.intellij.reference.SoftReference; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| import java.lang.ref.WeakReference; |
| |
| /** |
| * @author yole |
| */ |
| public class EditorHighlighterCache { |
| private static final Key<WeakReference<EditorHighlighter>> ourSomeEditorSyntaxHighlighter = Key.create("some editor highlighter"); |
| |
| private EditorHighlighterCache() { |
| } |
| |
| public static void rememberEditorHighlighterForCachesOptimization(Document document, @NotNull final EditorHighlighter highlighter) { |
| document.putUserData(ourSomeEditorSyntaxHighlighter, new WeakReference<EditorHighlighter>(highlighter)); |
| } |
| |
| @Nullable |
| public static EditorHighlighter getEditorHighlighterForCachesBuilding(Document document) { |
| if (document == null) { |
| return null; |
| } |
| final WeakReference<EditorHighlighter> editorHighlighterWeakReference = document.getUserData(ourSomeEditorSyntaxHighlighter); |
| final EditorHighlighter someEditorHighlighter = SoftReference.dereference(editorHighlighterWeakReference); |
| |
| if (someEditorHighlighter instanceof LexerEditorHighlighter && |
| ((LexerEditorHighlighter)someEditorHighlighter).isValid() |
| ) { |
| return someEditorHighlighter; |
| } |
| document.putUserData(ourSomeEditorSyntaxHighlighter, null); |
| return null; |
| } |
| |
| @Nullable |
| public static Lexer getLexerBasedOnLexerHighlighter(CharSequence text, VirtualFile virtualFile, Project project) { |
| EditorHighlighter highlighter = null; |
| |
| PsiFile psiFile = virtualFile != null ? PsiManager.getInstance(project).findFile(virtualFile) : null; |
| final Document document = psiFile != null ? PsiDocumentManager.getInstance(project).getDocument(psiFile) : null; |
| final EditorHighlighter cachedEditorHighlighter; |
| boolean alreadyInitializedHighlighter = false; |
| |
| if (document != null && |
| (cachedEditorHighlighter = getEditorHighlighterForCachesBuilding(document)) != null && |
| PlatformIdTableBuilding.checkCanUseCachedEditorHighlighter(text, cachedEditorHighlighter)) { |
| highlighter = cachedEditorHighlighter; |
| alreadyInitializedHighlighter = true; |
| } |
| else if (virtualFile != null) { |
| highlighter = EditorHighlighterFactory.getInstance().createEditorHighlighter(project, virtualFile); |
| } |
| |
| if (highlighter != null) { |
| return new LexerEditorHighlighterLexer(highlighter, alreadyInitializedHighlighter); |
| } |
| return null; |
| } |
| } |