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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.highlighting.BraceMatcher;
import com.intellij.codeInsight.highlighting.BraceMatchingUtil;
import com.intellij.injected.editor.EditorWindow;
import com.intellij.lang.injection.InjectedLanguageManager;
import com.intellij.openapi.actionSystem.CommonDataKeys;
import com.intellij.openapi.actionSystem.DataContext;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.editor.LogicalPosition;
import com.intellij.openapi.editor.actionSystem.EditorActionHandler;
import com.intellij.openapi.editor.actionSystem.EditorWriteActionHandler;
import com.intellij.openapi.editor.ex.EditorEx;
import com.intellij.openapi.editor.highlighter.HighlighterIterator;
import com.intellij.openapi.extensions.Extensions;
import com.intellij.openapi.fileTypes.FileType;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.TextRange;
import com.intellij.psi.PsiDocumentManager;
import com.intellij.psi.PsiFile;
import com.intellij.psi.codeStyle.CodeStyleSettingsManager;
import com.intellij.psi.util.PsiUtilBase;
import org.jetbrains.annotations.Nullable;
import java.util.List;
public class BackspaceHandler extends EditorWriteActionHandler {
protected final EditorActionHandler myOriginalHandler;
public BackspaceHandler(EditorActionHandler originalHandler) {
super(true);
myOriginalHandler = originalHandler;
}
@Override
public void executeWriteAction(Editor editor, DataContext dataContext) {
if (!handleBackspace(editor, dataContext, false)) {
myOriginalHandler.execute(editor, dataContext);
}
}
protected boolean handleBackspace(Editor editor, DataContext dataContext, boolean toWordStart) {
Project project = CommonDataKeys.PROJECT.getData(dataContext);
if (project == null) return false;
PsiFile file = PsiUtilBase.getPsiFileInEditor(editor, project);
if (file == null) return false;
if (editor.getSelectionModel().hasSelection()) return false;
int offset = editor.getCaretModel().getOffset() - 1;
if (offset < 0) return false;
CharSequence chars = editor.getDocument().getCharsSequence();
char c = chars.charAt(offset);
final Editor injectedEditor = TypedHandler.injectedEditorIfCharTypedIsSignificant(c, editor, file);
final Editor originalEditor = editor;
if (injectedEditor != editor) {
int injectedOffset = injectedEditor.getCaretModel().getOffset();
if (isOffsetInsideInjected(injectedEditor, injectedOffset)) {
file = PsiDocumentManager.getInstance(project).getPsiFile(injectedEditor.getDocument());
editor = injectedEditor;
offset = injectedOffset - 1;
}
}
final BackspaceHandlerDelegate[] delegates = Extensions.getExtensions(BackspaceHandlerDelegate.EP_NAME);
if (!toWordStart) {
for(BackspaceHandlerDelegate delegate: delegates) {
delegate.beforeCharDeleted(c, file, editor);
}
}
FileType fileType = file.getFileType();
final QuoteHandler quoteHandler = TypedHandler.getQuoteHandler(file, editor);
HighlighterIterator hiterator = ((EditorEx)editor).getHighlighter().createIterator(offset);
boolean wasClosingQuote = quoteHandler != null && quoteHandler.isClosingQuote(hiterator, offset);
myOriginalHandler.execute(originalEditor, dataContext);
if (!toWordStart) {
for(BackspaceHandlerDelegate delegate: delegates) {
if (delegate.charDeleted(c, file, editor)) {
return true;
}
}
}
if (offset >= editor.getDocument().getTextLength()) return true;
chars = editor.getDocument().getCharsSequence();
if (c == '(' || c == '[' || c == '{'){
char c1 = chars.charAt(offset);
if (c == '(' && c1 != ')') return true;
if (c == '[' && c1 != ']') return true;
if (c == '{' && c1 != '}') return true;
HighlighterIterator iterator = ((EditorEx)editor).getHighlighter().createIterator(offset);
BraceMatcher braceMatcher = BraceMatchingUtil.getBraceMatcher(fileType, iterator);
if (!braceMatcher.isLBraceToken(iterator, chars, fileType) &&
!braceMatcher.isRBraceToken(iterator, chars, fileType)
) {
return true;
}
int rparenOffset = BraceMatchingUtil.findRightmostRParen(iterator, iterator.getTokenType() ,chars,fileType);
if (rparenOffset >= 0){
iterator = ((EditorEx)editor).getHighlighter().createIterator(rparenOffset);
boolean matched = BraceMatchingUtil.matchBrace(chars, fileType, iterator, false);
if (matched) return true;
}
editor.getDocument().deleteString(offset, offset + 1);
}
else if (c == '"' || c == '\'' || c == '`'){
char c1 = chars.charAt(offset);
if (c1 != c) return true;
if (wasClosingQuote) return true;
HighlighterIterator iterator = ((EditorEx)editor).getHighlighter().createIterator(offset);
if (quoteHandler == null || !quoteHandler.isOpeningQuote(iterator,offset)) return true;
editor.getDocument().deleteString(offset, offset + 1);
}
return true;
}
private static boolean isOffsetInsideInjected(Editor injectedEditor, int injectedOffset) {
if (injectedOffset == 0 || injectedOffset >= injectedEditor.getDocument().getTextLength()) {
return false;
}
PsiFile injectedFile = ((EditorWindow)injectedEditor).getInjectedFile();
InjectedLanguageManager ilm = InjectedLanguageManager.getInstance(injectedFile.getProject());
TextRange rangeToEdit = new TextRange(injectedOffset - 1, injectedOffset+1);
List<TextRange> editables = ilm.intersectWithAllEditableFragments(injectedFile, rangeToEdit);
return editables.size() == 1 && editables.get(0).equals(rangeToEdit);
}
@Nullable
public static LogicalPosition getBackspaceUnindentPosition(final PsiFile file, final Editor editor) {
if (editor.getSelectionModel().hasSelection() || editor.getSelectionModel().hasBlockSelection()) return null;
final LogicalPosition caretPos = editor.getCaretModel().getLogicalPosition();
if (caretPos.line == 0 || caretPos.column == 0) {
return null;
}
if (!isWhitespaceBeforeCaret(editor)) {
return null;
}
// Decrease column down to indentation * n
final int indent = CodeStyleSettingsManager.getSettings(file.getProject()).getIndentSize(file.getFileType());
int column = (caretPos.column - 1) / indent * indent;
if (column < 0) {
column = 0;
}
return new LogicalPosition(caretPos.line, column);
}
public static boolean isWhitespaceBeforeCaret(Editor editor) {
final LogicalPosition caretPos = editor.getCaretModel().getLogicalPosition();
final CharSequence charSeq = editor.getDocument().getCharsSequence();
// smart backspace is activated only if all characters in the check range are whitespace characters
for(int pos=0; pos<caretPos.column; pos++) {
// use logicalPositionToOffset to make sure tabs are handled correctly
final LogicalPosition checkPos = new LogicalPosition(caretPos.line, pos);
final int offset = editor.logicalPositionToOffset(checkPos);
if (offset < charSeq.length()) {
final char c = charSeq.charAt(offset);
if (c != '\t' && c != ' ' && c != '\n') {
return false;
}
}
}
return true;
}
}
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