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/*
* Copyright 2000-2014 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.codeInsight.CodeInsightSettings;
import com.intellij.codeStyle.CodeStyleFacade;
import com.intellij.formatting.*;
import com.intellij.lang.LanguageFormatting;
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.fileEditor.FileDocumentManager;
import com.intellij.openapi.fileTypes.FileType;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.psi.PsiDocumentManager;
import com.intellij.psi.PsiFile;
import com.intellij.psi.codeStyle.CodeStyleSettings;
import com.intellij.psi.codeStyle.CodeStyleSettingsManager;
import com.intellij.psi.codeStyle.LanguageCodeStyleSettingsProvider;
import com.intellij.util.text.CharArrayUtil;
import org.jetbrains.annotations.NotNull;
/**
* Makes Backspace action delete all whitespace till next valid indent position
*/
public class IndentingBackspaceHandler extends BackspaceHandlerDelegate {
private static final Logger LOG = Logger.getInstance(IndentingBackspaceHandler.class);
private boolean isApplicable;
private boolean caretWasAtLineStart;
private String precalculatedSpacing;
@Override
public void beforeCharDeleted(char c, PsiFile file, Editor editor) {
if (CodeInsightSettings.getInstance().SMART_BACKSPACE != CodeInsightSettings.AUTOINDENT || !StringUtil.isWhiteSpace(c)) {
isApplicable = false;
return;
}
LanguageCodeStyleSettingsProvider codeStyleSettingsProvider = LanguageCodeStyleSettingsProvider.forLanguage(file.getLanguage());
if (codeStyleSettingsProvider != null && codeStyleSettingsProvider.isIndentBasedLanguageSemantics()) {
isApplicable = false;
return;
}
Document document = editor.getDocument();
CharSequence charSequence = document.getCharsSequence();
CaretModel caretModel = editor.getCaretModel();
int caretOffset = caretModel.getOffset();
LogicalPosition pos = caretModel.getLogicalPosition();
isApplicable = true;
caretWasAtLineStart = pos.column == 0;
precalculatedSpacing = null;
if (caretWasAtLineStart && pos.line > 0 && caretOffset < charSequence.length() && !StringUtil.isWhiteSpace(charSequence.charAt(caretOffset))) {
int prevLineEnd = document.getLineEndOffset(pos.line - 1);
if (prevLineEnd > 0 && !StringUtil.isWhiteSpace(charSequence.charAt(prevLineEnd - 1))) {
PsiDocumentManager.getInstance(file.getProject()).commitDocument(document);
precalculatedSpacing = getSpacing(file, caretOffset);
}
}
}
@Override
public boolean charDeleted(char c, PsiFile file, Editor editor) {
if (!isApplicable) {
return false;
}
Project project = file.getProject();
Document document = editor.getDocument();
CaretModel caretModel = editor.getCaretModel();
int caretOffset = caretModel.getOffset();
int offset = CharArrayUtil.shiftForward(document.getCharsSequence(), caretOffset, " \t");
int beforeWhitespaceOffset = CharArrayUtil.shiftBackward(document.getCharsSequence(), offset - 1, " \t") + 1;
LogicalPosition logicalPosition = caretOffset < offset ? editor.offsetToLogicalPosition(offset) : caretModel.getLogicalPosition();
int lineStartOffset = document.getLineStartOffset(logicalPosition.line);
if (lineStartOffset < beforeWhitespaceOffset) {
if (caretWasAtLineStart && beforeWhitespaceOffset <= offset) {
String spacing;
if (precalculatedSpacing == null) {
PsiDocumentManager.getInstance(project).commitDocument(document);
spacing = getSpacing(file, offset);
}
else {
spacing = precalculatedSpacing;
}
if (beforeWhitespaceOffset < offset || !spacing.isEmpty()) {
document.replaceString(beforeWhitespaceOffset, offset, spacing);
caretModel.moveToOffset(beforeWhitespaceOffset + spacing.length());
return true;
}
}
return false;
}
PsiDocumentManager.getInstance(project).commitDocument(document);
CodeStyleFacade codeStyleFacade = CodeStyleFacade.getInstance(project);
String indent = codeStyleFacade.getLineIndent(document, offset);
if (indent == null) {
return false;
}
int tabSize = getTabSize(codeStyleFacade, document);
int targetColumn = getWidth(indent, tabSize);
if (logicalPosition.column == targetColumn) {
if (caretOffset < offset) {
caretModel.moveToLogicalPosition(logicalPosition);
return true;
}
return false;
}
if (caretWasAtLineStart || logicalPosition.column > targetColumn) {
document.replaceString(lineStartOffset, offset, indent);
caretModel.moveToLogicalPosition(new LogicalPosition(logicalPosition.line, targetColumn));
return true;
}
if (logicalPosition.line == 0) {
return false;
}
int prevLineStartOffset = document.getLineStartOffset(logicalPosition.line - 1);
int prevLineEndOffset = document.getLineEndOffset(logicalPosition.line - 1);
int targetOffset = CharArrayUtil.shiftBackward(document.getCharsSequence(), prevLineEndOffset - 1, " \t") + 1;
if (prevLineStartOffset < targetOffset) {
String spacing = getSpacing(file, offset);
document.replaceString(targetOffset, offset, spacing);
caretModel.moveToOffset(targetOffset + spacing.length());
}
else {
document.replaceString(prevLineStartOffset, offset, indent);
caretModel.moveToLogicalPosition(new LogicalPosition(logicalPosition.line - 1, targetColumn));
}
return true;
}
private static int getTabSize(@NotNull CodeStyleFacade codeStyleFacade, @NotNull Document document) {
VirtualFile file = FileDocumentManager.getInstance().getFile(document);
FileType fileType = file == null ? null : file.getFileType();
return codeStyleFacade.getTabSize(fileType);
}
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;
}
private static String getSpacing(PsiFile file, int offset) {
FormattingModelBuilder builder = LanguageFormatting.INSTANCE.forContext(file);
if (builder == null) {
return "";
}
CodeStyleSettings settings = CodeStyleSettingsManager.getSettings(file.getProject());
FormattingModel model = builder.createModel(file, settings);
int spacing = FormatterEx.getInstance().getSpacingForBlockAtOffset(model, offset);
return StringUtil.repeatSymbol(' ', spacing);
}
}
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