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/*******************************************************************************
* Copyright (c) 2016 Nathan Ridge and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package org.eclipse.cdt.internal.ui.editor;
import java.io.File;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import org.eclipse.cdt.core.CCorePlugin;
import org.eclipse.cdt.core.model.IInclude;
import org.eclipse.cdt.core.parser.ExtendedScannerInfo;
import org.eclipse.cdt.core.parser.IExtendedScannerInfo;
import org.eclipse.cdt.core.parser.IScannerInfo;
import org.eclipse.cdt.core.parser.IScannerInfoProvider;
import org.eclipse.cdt.internal.core.resources.ResourceLookup;
import org.eclipse.cdt.utils.PathUtil;
import org.eclipse.cdt.utils.UNCPathConverter;
import org.eclipse.core.filesystem.EFS;
import org.eclipse.core.filesystem.IFileStore;
import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IResourceProxy;
import org.eclipse.core.resources.IResourceProxyVisitor;
import org.eclipse.core.resources.IWorkspaceRoot;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.Platform;
/**
* Handles resolution of an include represented as a CElement (IInclude).
*/
public class CElementIncludeResolver {
public static List<IPath> resolveInclude(IInclude include) throws CoreException {
IResource res = include.getUnderlyingResource();
ArrayList<IPath> filesFound = new ArrayList<>(4);
String fullFileName = include.getFullFileName();
if (fullFileName != null) {
IPath fullPath = new Path(fullFileName);
if (fullPath.isAbsolute() && fullPath.toFile().exists()) {
filesFound.add(fullPath);
} else if (fullPath.isUNC()) {
IFileStore store = EFS.getStore(UNCPathConverter.getInstance().toURI(fullPath));
if (store.fetchInfo().exists()) {
filesFound.add(fullPath);
}
}
}
if (filesFound.isEmpty() && res != null) {
IProject proj = res.getProject();
String includeName = include.getElementName();
// Search in the scannerInfo information
IScannerInfoProvider provider = CCorePlugin.getDefault().getScannerInfoProvider(proj);
if (provider != null) {
IScannerInfo info = provider.getScannerInformation(res);
// XXXX this should fall back to project by itself
if (info == null) {
info = provider.getScannerInformation(proj);
}
if (info != null) {
IExtendedScannerInfo scanInfo = new ExtendedScannerInfo(info);
boolean isSystemInclude = include.isStandard();
if (!isSystemInclude) {
// search in current directory
IPath location = include.getTranslationUnit().getLocation();
if (location != null) {
String currentDir = location.removeLastSegments(1).toOSString();
findFile(new String[] { currentDir }, includeName, filesFound);
}
if (filesFound.isEmpty()) {
// search in "..." include directories
String[] localIncludePaths = scanInfo.getLocalIncludePath();
findFile(localIncludePaths, includeName, filesFound);
}
}
if (filesFound.isEmpty()) {
// search in <...> include directories
String[] includePaths = scanInfo.getIncludePaths();
findFile(includePaths, includeName, filesFound);
}
}
if (filesFound.isEmpty()) {
// Fall back and search the project
findFile(proj, new Path(includeName), filesFound);
}
}
}
return filesFound;
}
private static void findFile(String[] includePaths, String name, ArrayList<IPath> list) throws CoreException {
// in case it is an absolute path
IPath includeFile = new Path(name);
if (includeFile.isAbsolute()) {
includeFile = PathUtil.getCanonicalPathWindows(includeFile);
if (includeFile.toFile().exists()) {
list.add(includeFile);
return;
}
}
HashSet<IPath> foundSet = new HashSet<>();
for (String includePath : includePaths) {
IPath path = PathUtil.getCanonicalPathWindows(new Path(includePath).append(includeFile));
File file = path.toFile();
if (file.exists()) {
IPath[] paths = resolveIncludeLink(path);
for (IPath p : paths) {
if (foundSet.add(p)) {
list.add(p);
}
}
}
}
}
/**
* Recurse in the project.
* @param parent
* @param name
* @param list
* @throws CoreException
*/
private static void findFile(IContainer parent, final IPath name, final ArrayList<IPath> list)
throws CoreException {
parent.accept(new IResourceProxyVisitor() {
@Override
public boolean visit(IResourceProxy proxy) throws CoreException {
if (proxy.getType() == IResource.FILE && proxy.getName().equalsIgnoreCase(name.lastSegment())) {
IPath rPath = proxy.requestResource().getLocation();
if (rPath != null) {
int numSegToRemove = rPath.segmentCount() - name.segmentCount();
IPath sPath = rPath.removeFirstSegments(numSegToRemove);
sPath = sPath.setDevice(name.getDevice());
if (Platform.getOS().equals(Platform.OS_WIN32)
? sPath.toOSString().equalsIgnoreCase(name.toOSString())
: sPath.equals(name)) {
list.add(rPath);
}
return false;
}
}
return true;
}
}, 0);
}
/**
* Returns the path as is, if it points to a workspace resource. If the path
* does not point to a workspace resource, but there are linked workspace
* resources pointing to it, returns the paths of these resources.
* Otherwise, returns the path as is.
*/
private static IPath[] resolveIncludeLink(IPath path) {
if (!isInProject(path)) {
IFile[] files = ResourceLookup.findFilesForLocation(path);
if (files.length > 0) {
IPath[] paths = new IPath[files.length];
for (int i = 0; i < files.length; i++) {
paths[i] = files[i].getFullPath();
}
return paths;
}
}
return new IPath[] { path };
}
private static boolean isInProject(IPath path) {
return getWorkspaceRoot().getFileForLocation(path) != null;
}
private static IWorkspaceRoot getWorkspaceRoot() {
return ResourcesPlugin.getWorkspace().getRoot();
}
}
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