| /* |
| * 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); |
| } |
| } |