/*
* Copyright 2000-2017 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.codeInsight.editorActions;
import com.intellij.codeStyle.CodeStyleFacade;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.editor.CaretModel;
import com.intellij.openapi.editor.Document;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.editor.LogicalPosition;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.psi.PsiDocumentManager;
import com.intellij.psi.PsiFile;
import com.intellij.psi.codeStyle.CodeStyleManager;
import com.intellij.util.text.CharArrayUtil;
import org.jetbrains.annotations.NotNull;
public class SmartIndentingBackspaceHandler extends AbstractIndentingBackspaceHandler {
private static final Logger LOG = Logger.getInstance(SmartIndentingBackspaceHandler.class);
private String myReplacement;
private int myStartOffset;
public SmartIndentingBackspaceHandler() {
super(SmartBackspaceMode.AUTOINDENT);
}
@Override
protected void doBeforeCharDeleted(char c, PsiFile file, Editor editor) {
Project project = file.getProject();
Document document = editor.getDocument();
CharSequence charSequence = document.getImmutableCharSequence();
CaretModel caretModel = editor.getCaretModel();
int caretOffset = caretModel.getOffset();
LogicalPosition pos = caretModel.getLogicalPosition();
int lineStartOffset = document.getLineStartOffset(pos.line);
int beforeWhitespaceOffset = CharArrayUtil.shiftBackward(charSequence, caretOffset - 1, " \t") + 1;
if (beforeWhitespaceOffset != lineStartOffset) {
myReplacement = null;
return;
}
PsiDocumentManager.getInstance(project).commitDocument(document);
CodeStyleFacade codeStyleFacade = CodeStyleFacade.getInstance(project);
myReplacement = codeStyleFacade.getLineIndent(document, lineStartOffset);
if (myReplacement == null) {
return;
}
int tabSize = codeStyleFacade.getTabSize(file.getFileType());
int targetColumn = getWidth(myReplacement, tabSize);
int endOffset = CharArrayUtil.shiftForward(charSequence, caretOffset, " \t");
LogicalPosition logicalPosition = caretOffset < endOffset ? editor.offsetToLogicalPosition(endOffset) : pos;
int currentColumn = logicalPosition.column;
if (currentColumn > targetColumn) {
myStartOffset = lineStartOffset;
}
else if (logicalPosition.line == 0) {
myStartOffset = 0;
myReplacement = "";
}
else {
int prevLineEndOffset = document.getLineEndOffset(logicalPosition.line - 1);
myStartOffset = CharArrayUtil.shiftBackward(charSequence, prevLineEndOffset - 1, " \t") + 1;
if (myStartOffset != document.getLineStartOffset(logicalPosition.line - 1)) {
int spacing = CodeStyleManager.getInstance(project).getSpacing(file, endOffset);
myReplacement = StringUtil.repeatSymbol(' ', Math.max(0, spacing));
}
}
}
@Override
protected boolean doCharDeleted(char c, PsiFile file, Editor editor) {
if (myReplacement == null) {
return false;
}
Document document = editor.getDocument();
CaretModel caretModel = editor.getCaretModel();
int endOffset = CharArrayUtil.shiftForward(document.getImmutableCharSequence(), caretModel.getOffset(), " \t");
document.replaceString(myStartOffset, endOffset, myReplacement);
caretModel.moveToOffset(myStartOffset + myReplacement.length());
return true;
}
private static int getWidth(@NotNull String indent, int tabSize) {
int width = 0;
for (int i = 0; i < indent.length(); i++) {
char c = indent.charAt(i);
switch (c) {
case '\t':
width = tabSize * (width / tabSize + 1);
break;
default:
LOG.error("Unexpected whitespace character: " + ((int)c));
case ' ':
width++;
}
}
return width;
}
}