001/*
002 * Copyright 2010-2013 JetBrains s.r.o.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.jetbrains.jet.lang.diagnostics;
018
019import com.intellij.lang.ASTNode;
020import com.intellij.openapi.util.TextRange;
021import com.intellij.psi.PsiElement;
022import com.intellij.psi.PsiErrorElement;
023import org.jetbrains.annotations.NotNull;
024
025import java.util.Collections;
026import java.util.List;
027
028public class PositioningStrategy<E extends PsiElement> {
029    @NotNull
030    public List<TextRange> mark(@NotNull E element) {
031        return markElement(element);
032    }
033
034    public boolean isValid(@NotNull E element) {
035        return !hasSyntaxErrors(element);
036    }
037
038    @NotNull
039    protected static List<TextRange> markElement(@NotNull PsiElement element) {
040        return Collections.singletonList(element.getTextRange());
041    }
042
043    @NotNull
044    protected static List<TextRange> markNode(@NotNull ASTNode node) {
045        return Collections.singletonList(node.getTextRange());
046    }
047
048    @NotNull
049    protected static List<TextRange> markRange(@NotNull TextRange range) {
050        return Collections.singletonList(range);
051    }
052
053    protected static boolean hasSyntaxErrors(@NotNull PsiElement psiElement) {
054        if (psiElement instanceof PsiErrorElement) return true;
055
056        PsiElement lastChild = psiElement.getLastChild();
057        if (lastChild != null && hasSyntaxErrors(lastChild)) return true;
058
059        PsiElement[] children = psiElement.getChildren();
060        if (children.length > 0 && hasSyntaxErrors(children[children.length - 1])) return true;
061
062        return false;
063    }
064}