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/*
* Copyright 2000-2009 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.editorActions.enter.EnterHandlerDelegateAdapter;
import com.intellij.openapi.actionSystem.DataContext;
import com.intellij.openapi.actionSystem.PlatformDataKeys;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.editor.actionSystem.EditorActionHandler;
import com.intellij.openapi.editor.ex.EditorEx;
import com.intellij.openapi.editor.highlighter.EditorHighlighter;
import com.intellij.openapi.editor.highlighter.HighlighterIterator;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.Ref;
import com.intellij.psi.PsiDocumentManager;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiFile;
import com.intellij.psi.tree.IElementType;
import com.intellij.psi.xml.XmlFile;
import com.intellij.psi.xml.XmlTag;
import com.intellij.psi.xml.XmlTokenType;
import org.jetbrains.annotations.NotNull;
public class EnterBetweenXmlTagsHandler extends EnterHandlerDelegateAdapter {
public Result preprocessEnter(@NotNull final PsiFile file, @NotNull final Editor editor, @NotNull final Ref<Integer> caretOffset, @NotNull final Ref<Integer> caretAdvance,
@NotNull final DataContext dataContext, final EditorActionHandler originalHandler) {
final Project project = PlatformDataKeys.PROJECT.getData(dataContext);
if (file instanceof XmlFile && isBetweenXmlTags(project, editor, file, caretOffset.get().intValue())) {
originalHandler.execute(editor, dataContext);
return Result.DefaultForceIndent;
}
return Result.Continue;
}
private static boolean isBetweenXmlTags(Project project, Editor editor, PsiFile file, int offset) {
if (offset == 0) return false;
CharSequence chars = editor.getDocument().getCharsSequence();
if (chars.charAt(offset - 1) != '>') return false;
EditorHighlighter highlighter = ((EditorEx)editor).getHighlighter();
HighlighterIterator iterator = highlighter.createIterator(offset - 1);
if (iterator.getTokenType() != XmlTokenType.XML_TAG_END) return false;
if (isAtTheEndOfEmptyTag(project, editor, file, iterator)) {
return false;
}
iterator.retreat();
int retrieveCount = 1;
while(!iterator.atEnd()) {
final IElementType tokenType = iterator.getTokenType();
if (tokenType == XmlTokenType.XML_END_TAG_START) return false;
if (tokenType == XmlTokenType.XML_START_TAG_START) break;
++retrieveCount;
iterator.retreat();
}
for(int i = 0; i < retrieveCount; ++i) iterator.advance();
iterator.advance();
return !iterator.atEnd() && iterator.getTokenType() == XmlTokenType.XML_END_TAG_START;
}
private static boolean isAtTheEndOfEmptyTag(Project project, Editor editor, PsiFile file, HighlighterIterator iterator) {
if (iterator.getTokenType() != XmlTokenType.XML_TAG_END) {
return false;
}
PsiDocumentManager.getInstance(project).commitDocument(editor.getDocument());
final PsiElement element = file.findElementAt(iterator.getStart());
if (element == null) {
return false;
}
final PsiElement parent = element.getParent();
return parent instanceof XmlTag &&
parent.getTextRange().getEndOffset() == iterator.getEnd();
}
}
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