| /* |
| * Copyright 2006 Sascha Weinreuter |
| * |
| * 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 org.intellij.lang.regexp.psi.impl; |
| |
| import com.intellij.lang.ASTNode; |
| import com.intellij.openapi.util.Comparing; |
| import com.intellij.openapi.util.TextRange; |
| import com.intellij.psi.PsiElement; |
| import com.intellij.psi.PsiReference; |
| import com.intellij.psi.util.PsiTreeUtil; |
| import com.intellij.psi.util.PsiElementFilter; |
| import com.intellij.psi.search.PsiElementProcessor; |
| import com.intellij.util.IncorrectOperationException; |
| import com.intellij.util.ArrayUtil; |
| |
| import org.intellij.lang.regexp.psi.RegExpElementVisitor; |
| import org.intellij.lang.regexp.psi.RegExpElement; |
| import org.intellij.lang.regexp.psi.RegExpGroup; |
| import org.intellij.lang.regexp.psi.RegExpBackref; |
| import org.jetbrains.annotations.NotNull; |
| |
| public class RegExpBackrefImpl extends RegExpElementImpl implements RegExpBackref { |
| public RegExpBackrefImpl(ASTNode astNode) { |
| super(astNode); |
| } |
| |
| public int getIndex() { |
| final String s = getUnescapedText(); |
| assert s.charAt(0) == '\\'; |
| return Integer.parseInt(s.substring(1)); |
| } |
| |
| public void accept(RegExpElementVisitor visitor) { |
| visitor.visitRegExpBackref(this); |
| } |
| |
| public RegExpGroup resolve() { |
| final int index = getIndex(); |
| |
| final PsiElementProcessor.FindFilteredElement<RegExpElement> processor = new PsiElementProcessor.FindFilteredElement<RegExpElement>(new PsiElementFilter() { |
| int groupCount; |
| |
| public boolean isAccepted(PsiElement element) { |
| if (element instanceof RegExpGroup) { |
| if (((RegExpGroup)element).isCapturing() && ++groupCount == index) { |
| return true; |
| } |
| } |
| return element == RegExpBackrefImpl.this; |
| } |
| }); |
| |
| PsiTreeUtil.processElements(getContainingFile(), processor); |
| if (processor.getFoundElement() instanceof RegExpGroup) { |
| return (RegExpGroup)processor.getFoundElement(); |
| } |
| return null; |
| } |
| |
| public PsiReference getReference() { |
| return new PsiReference() { |
| public PsiElement getElement() { |
| return RegExpBackrefImpl.this; |
| } |
| |
| public TextRange getRangeInElement() { |
| return TextRange.from(0, getElement().getTextLength()); |
| } |
| |
| @NotNull |
| public String getCanonicalText() { |
| return getElement().getText(); |
| } |
| |
| public PsiElement handleElementRename(String newElementName) throws IncorrectOperationException { |
| throw new IncorrectOperationException(); |
| } |
| |
| public PsiElement bindToElement(@NotNull PsiElement element) throws IncorrectOperationException { |
| throw new IncorrectOperationException(); |
| } |
| |
| public boolean isReferenceTo(PsiElement element) { |
| return Comparing.equal(element, resolve()); |
| } |
| |
| public boolean isSoft() { |
| return false; |
| } |
| |
| public PsiElement resolve() { |
| return RegExpBackrefImpl.this.resolve(); |
| } |
| |
| @NotNull |
| public Object[] getVariants() { |
| return ArrayUtil.EMPTY_OBJECT_ARRAY; |
| } |
| }; |
| } |
| } |