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/*
* 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.diff;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.editor.Document;
import com.intellij.openapi.editor.EditorFactory;
import com.intellij.openapi.editor.RangeMarker;
import com.intellij.openapi.editor.event.DocumentEvent;
import com.intellij.openapi.fileEditor.FileDocumentManager;
import com.intellij.openapi.fileEditor.OpenFileDescriptor;
import com.intellij.openapi.fileTypes.FileType;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.Key;
import com.intellij.openapi.util.TextRange;
import com.intellij.openapi.vfs.VirtualFile;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.io.IOException;
/**
* Represents sub text of other content. Original content should provide not null document.
*/
public class FragmentContent extends DiffContent {
private static final Logger LOG = Logger.getInstance("#com.intellij.openapi.diff.FragmentContent");
private final DiffContent myOriginal;
private final FileType myType;
private final MyDocumentsSynchronizer mySynchonizer;
public static final Key<Document> ORIGINAL_DOCUMENT = new Key<Document>("ORIGINAL_DOCUMENT");
private final boolean myForceReadOnly;
public FragmentContent(@NotNull DiffContent original, @NotNull TextRange range, Project project, VirtualFile file) {
this(original, range, project, file, false);
}
public FragmentContent(@NotNull DiffContent original, @NotNull TextRange range, Project project, VirtualFile file, boolean forceReadOnly) {
this(original, range, project, file != null ? DiffContentUtil.getContentType(file) : null, forceReadOnly);
}
public FragmentContent(@NotNull DiffContent original, @NotNull TextRange range, Project project, FileType fileType) {
this(original, range, project, fileType, false);
}
public FragmentContent(@NotNull DiffContent original, @NotNull TextRange range, Project project, FileType fileType, boolean forceReadOnly) {
RangeMarker rangeMarker = original.getDocument().createRangeMarker(range.getStartOffset(), range.getEndOffset(), true);
rangeMarker.setGreedyToLeft(true);
rangeMarker.setGreedyToRight(true);
mySynchonizer = new MyDocumentsSynchronizer(project, rangeMarker);
myOriginal = original;
myType = fileType;
myForceReadOnly = forceReadOnly;
}
public FragmentContent(DiffContent original, TextRange range, Project project) {
this(original, range, project, (FileType)null);
}
private static String subText(Document document, int startOffset, int length) {
return document.getCharsSequence().subSequence(startOffset, startOffset + length).toString();
}
@Override
public void onAssigned(boolean isAssigned) {
myOriginal.onAssigned(isAssigned);
mySynchonizer.listenDocuments(isAssigned);
super.onAssigned(isAssigned);
}
@Override
@NotNull
public Document getDocument() {
return mySynchonizer.getCopy();
}
@Override
public OpenFileDescriptor getOpenFileDescriptor(int offset) {
return myOriginal.getOpenFileDescriptor(offset + mySynchonizer.getStartOffset());
}
@Override
public VirtualFile getFile() {
return null;
}
@Override
@Nullable
public FileType getContentType() {
return myType != null ? myType : myOriginal.getContentType();
}
@Override
public byte[] getBytes() throws IOException {
return getDocument().getText().getBytes();
}
public static FragmentContent fromRangeMarker(RangeMarker rangeMarker, Project project) {
Document document = rangeMarker.getDocument();
VirtualFile file = FileDocumentManager.getInstance().getFile(document);
FileType type = file.getFileType();
return new FragmentContent(new DocumentContent(project, document), TextRange.create(rangeMarker), project, type);
}
private class MyDocumentsSynchronizer extends DocumentsSynchronizer {
private final RangeMarker myRangeMarker;
public MyDocumentsSynchronizer(Project project, @NotNull RangeMarker originalRange) {
super(project);
myRangeMarker = originalRange;
}
public int getStartOffset() {
return myRangeMarker.getStartOffset();
}
@Override
protected void onOriginalChanged(@NotNull DocumentEvent event, @NotNull Document copy) {
if (!myRangeMarker.isValid()) {
fireContentInvalid();
return;
}
replaceString(copy, 0, copy.getTextLength(), subText(event.getDocument(), myRangeMarker.getStartOffset(), getLength()));
}
@Override
protected void beforeListenersAttached(@NotNull Document original, @NotNull Document copy) {
boolean readOnly = !copy.isWritable();
if (readOnly) {
copy.setReadOnly(false);
}
replaceString(copy, 0, copy.getTextLength(), subText(original, myRangeMarker.getStartOffset(), getLength()));
copy.setReadOnly(readOnly);
}
private int getLength() {
return myRangeMarker.getEndOffset() - myRangeMarker.getStartOffset();
}
@Override
protected Document createOriginal() {
return myRangeMarker.getDocument();
}
@NotNull
@Override
protected Document createCopy() {
final Document originalDocument = myRangeMarker.getDocument();
String textInRange =
originalDocument.getCharsSequence().subSequence(myRangeMarker.getStartOffset(), myRangeMarker.getEndOffset()).toString();
final Document result = EditorFactory.getInstance().createDocument(textInRange);
result.setReadOnly(myForceReadOnly || !originalDocument.isWritable());
result.putUserData(ORIGINAL_DOCUMENT, originalDocument);
return result;
}
@Override
protected void onCopyChanged(@NotNull DocumentEvent event, @NotNull Document original) {
final int originalOffset = event.getOffset() + myRangeMarker.getStartOffset();
LOG.assertTrue(originalOffset >= 0);
if (!original.isWritable()) return;
final String newText = subText(event.getDocument(), event.getOffset(), event.getNewLength());
final int originalEnd = originalOffset + event.getOldLength();
replaceString(original, originalOffset, originalEnd, newText);
}
}
}
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