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/*******************************************************************************
* Copyright (c) 2011 protos software gmbh (http://www.protos.de).
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* CONTRIBUTORS:
* Henrik Rentz-Reichert (initial contribution)
*
*******************************************************************************/
package org.eclipse.etrice.core.scoping;
import java.io.File;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.eclipse.core.resources.IFolder;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.Path;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.xtext.scoping.impl.ImportUriResolver;
/**
* This URI resolver tries to resolve against the <code>URI</code> of the object's resource.
* If this is a platform resource <code>URI</code> then it determines an absolute path and resolves against that.
*
* @author Henrik Rentz-Reichert
*
*/
public class PlatformRelativeUriResolver extends ImportUriResolver {
private Map<String, String> env = System.getenv();
/* (non-Javadoc)
* @see org.eclipse.xtext.scoping.impl.ImportUriResolver#resolve(org.eclipse.emf.ecore.EObject)
*/
@Override
public String resolve(EObject object) {
String resolve = super.resolve(object);
if (resolve==null || resolve.trim().isEmpty())
return null;
URI baseUri = object.eResource()==null? null:object.eResource().getURI();
resolve = resolve(resolve, baseUri);
return resolve;
}
public String resolve(String resolve, URI baseUri) {
resolve = substituteEnvVars(resolve);
resolve = resolve.replaceAll("\\\\", "/");
if (baseUri!=null) {
resolve = resolveUriAgainstBase(resolve, baseUri);
}
return resolve;
}
public String substituteEnvVars(String text) {
String pattern = "\\$\\{([A-Za-z0-9_]+)\\}";
Pattern expr = Pattern.compile(pattern);
Matcher matcher = expr.matcher(text);
while (matcher.find()) {
String envValue = env.get(matcher.group(1));
if (envValue == null) {
envValue = "";
}
else {
envValue = envValue.replace("\\", "\\\\");
}
Pattern subexpr = Pattern.compile(Pattern.quote(matcher.group(0)));
text = subexpr.matcher(text).replaceAll(envValue);
}
return text;
}
private String resolveUriAgainstBase(String resolve, URI baseUri) {
if (resolve==null || resolve.trim().isEmpty())
return null;
URI uri = URI.createURI(resolve);
if (uri.isRelative()) {
URI base = baseUri.trimSegments(1);
if (base.isPlatformResource()) {
IFolder folder = ResourcesPlugin.getWorkspace().getRoot().getFolder(new Path(base.toPlatformString(true)));
String abs = folder.getRawLocationURI().toString();
base = URI.createURI(abs);
}
else if (base.isRelative()) {
base = URI.createFileURI(new File(base.toString()).getAbsolutePath());
}
// URI.resolve expects a trailing separator for some reason...
base = base.appendSegment("");
try {
uri = uri.resolve(base);
}
catch (IllegalArgumentException e) {
}
resolve = uri.toString();
File file = new File(uri.toFileString());
if (file.isDirectory())
return "path/to/directory";
}
return resolve;
}
}
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