| /* |
| * 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.unwrap; |
| |
| import com.intellij.openapi.editor.Editor; |
| import com.intellij.psi.*; |
| import com.intellij.util.IncorrectOperationException; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Set; |
| |
| public abstract class AbstractUnwrapper<C extends AbstractUnwrapper.AbstractContext> implements Unwrapper { |
| private final String myDescription; |
| |
| public AbstractUnwrapper(String description) { |
| myDescription = description; |
| } |
| |
| @Override |
| public abstract boolean isApplicableTo(PsiElement e); |
| |
| @Override |
| public void collectElementsToIgnore(PsiElement element, Set<PsiElement> result) { |
| } |
| |
| @Override |
| public String getDescription(PsiElement e) { |
| return myDescription; |
| } |
| |
| @Override |
| public PsiElement collectAffectedElements(PsiElement e, List<PsiElement> toExtract) { |
| try { |
| C c = createContext(); |
| doUnwrap(e, c); |
| toExtract.addAll(c.myElementsToExtract); |
| return e; |
| } |
| catch (IncorrectOperationException ex) { |
| throw new RuntimeException(ex); |
| } |
| } |
| |
| @Override |
| public List<PsiElement> unwrap(Editor editor, PsiElement element) throws IncorrectOperationException { |
| C c = createContext(); |
| c.myIsEffective = true; |
| doUnwrap(element, c); |
| return c.myElementsToExtract; |
| } |
| |
| protected abstract void doUnwrap(PsiElement element, C context) throws IncorrectOperationException; |
| |
| protected abstract C createContext(); |
| |
| public abstract static class AbstractContext { |
| protected final List<PsiElement> myElementsToExtract = new ArrayList<PsiElement>(); |
| protected boolean myIsEffective; |
| |
| public void addElementToExtract(PsiElement e) { |
| myElementsToExtract.add(e); |
| } |
| |
| public void extractElement(PsiElement element, PsiElement from) throws IncorrectOperationException { |
| extract(element, element, from); |
| } |
| |
| protected abstract boolean isWhiteSpace(PsiElement element); |
| |
| protected void extract(PsiElement first, PsiElement last, PsiElement from) throws IncorrectOperationException { |
| // trim leading empty spaces |
| while (first != last && isWhiteSpace(first)) { |
| //noinspection ConstantConditions |
| first = first.getNextSibling(); |
| } |
| |
| // trim trailing empty spaces |
| while (last != first && isWhiteSpace(last)) { |
| //noinspection ConstantConditions |
| last = last.getPrevSibling(); |
| } |
| |
| // nothing to extract |
| if (first == null || last == null || first == last && isWhiteSpace(last)) return; |
| |
| PsiElement toExtract = first; |
| if (myIsEffective) { |
| toExtract = from.getParent().addRangeBefore(first, last, from); |
| } |
| |
| do { |
| if (toExtract != null) { |
| addElementToExtract(toExtract); |
| toExtract = toExtract.getNextSibling(); |
| } |
| first = first.getNextSibling(); |
| } |
| while (first != null && first.getPrevSibling() != last); |
| } |
| |
| public void delete(PsiElement e) throws IncorrectOperationException { |
| if (myIsEffective) e.delete(); |
| } |
| |
| public void deleteExactly(PsiElement e) throws IncorrectOperationException { |
| if (myIsEffective) { |
| // have to use 'parent.deleteChildRange' since 'e.delete' is too smart: |
| // it attempts to remove not only the element but sometimes whole expression. |
| e.getParent().deleteChildRange(e, e); |
| } |
| } |
| } |
| } |