| /* |
| * Copyright 2003-2005 Dave Griffith |
| * |
| * 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.siyeh.ipp.decls; |
| |
| import com.intellij.psi.*; |
| import com.intellij.psi.search.searches.ReferencesSearch; |
| import com.intellij.psi.util.PsiTreeUtil; |
| import com.siyeh.ipp.base.PsiElementPredicate; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| class MoveDeclarationPredicate implements PsiElementPredicate { |
| |
| public boolean satisfiedBy(@NotNull PsiElement element) { |
| if (!(element instanceof PsiLocalVariable)) { |
| return false; |
| } |
| final PsiLocalVariable variable = (PsiLocalVariable)element; |
| final PsiExpression initializer = variable.getInitializer(); |
| if (initializer != null) { |
| return false; |
| } |
| final PsiCodeBlock variableBlock = |
| PsiTreeUtil.getParentOfType(variable, PsiCodeBlock.class); |
| if (variableBlock == null) { |
| return false; |
| } |
| final PsiManager manager = variable.getManager(); |
| final PsiReference[] references = ReferencesSearch.search(variable, variable.getUseScope(), false).toArray(PsiReference.EMPTY_ARRAY); |
| if (references.length == 0) { |
| return false; |
| } |
| final PsiElement tightestBlock = getTightestBlock(references); |
| if (tightestBlock == null) { |
| return false; |
| } |
| if (!variableBlock.equals(tightestBlock)) { |
| return true; |
| } |
| |
| final PsiReference firstReference = references[0]; |
| final PsiElement referenceElement = firstReference.getElement(); |
| if (referenceElement == null) { |
| return false; |
| } |
| final PsiElement child = getChildWhichContainsElement(variableBlock, |
| referenceElement); |
| if (child == null) { |
| return false; |
| } |
| PsiElement prevSibling = child.getPrevSibling(); |
| if (prevSibling instanceof PsiWhiteSpace) { |
| prevSibling = prevSibling.getPrevSibling(); |
| } |
| if (prevSibling == null) { |
| return false; |
| } |
| return !prevSibling.equals(variable.getParent()); |
| } |
| |
| @Nullable |
| public static PsiElement getChildWhichContainsElement( |
| @NotNull PsiCodeBlock ancestor, @NotNull PsiElement descendant) { |
| PsiElement element = descendant; |
| while (!element.equals(ancestor)) { |
| descendant = element; |
| element = descendant.getParent(); |
| if (element == null) { |
| return null; |
| } |
| } |
| return descendant; |
| } |
| |
| @Nullable |
| public static PsiCodeBlock getTightestBlock( |
| @NotNull PsiReference[] references) { |
| PsiCodeBlock commonParentBlock = null; |
| for (PsiReference reference : references) { |
| final PsiElement referenceElement = reference.getElement(); |
| final PsiCodeBlock block = |
| PsiTreeUtil.getParentOfType(referenceElement, |
| PsiCodeBlock.class); |
| if (block == null) { |
| return commonParentBlock; |
| } |
| if (commonParentBlock != null && !commonParentBlock.equals(block)) { |
| final PsiElement commonParent = |
| PsiTreeUtil.findCommonParent(commonParentBlock, block); |
| if (commonParent instanceof PsiCodeBlock) { |
| commonParentBlock = (PsiCodeBlock)commonParent; |
| } |
| else { |
| commonParentBlock = |
| PsiTreeUtil.getParentOfType(commonParent, |
| PsiCodeBlock.class); |
| } |
| } |
| else { |
| commonParentBlock = block; |
| } |
| } |
| return commonParentBlock; |
| } |
| } |