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/*
Copyright (c) 2008 Arno Haase.
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:
Arno Haase - initial API and implementation
*/
package org.eclipse.xtend.middleend.old.internal.xtend;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.eclipose.xtend.middleend.MiddleEnd;
import org.eclipose.xtend.middleend.plugins.LanguageSpecificMiddleEnd;
import org.eclipse.internal.xtend.xtend.XtendFile;
import org.eclipse.internal.xtend.xtend.ast.Around;
import org.eclipse.internal.xtend.xtend.ast.Extension;
import org.eclipse.internal.xtend.xtend.ast.ExtensionFile;
import org.eclipse.internal.xtend.xtend.ast.ImportStatement;
import org.eclipse.xtend.backend.aop.AroundAdvice;
import org.eclipse.xtend.backend.common.BackendTypesystem;
import org.eclipse.xtend.backend.common.FunctionDefContext;
import org.eclipse.xtend.backend.common.NamedFunction;
import org.eclipse.xtend.backend.functions.FunctionDefContextFactory;
import org.eclipse.xtend.backend.functions.FunctionDefContextInternal;
import org.eclipse.xtend.backend.util.Cache;
import org.eclipse.xtend.expression.ExecutionContext;
import org.eclipse.xtend.middleend.old.common.OldHelper;
import org.eclipse.xtend.middleend.old.common.TypeToBackendType;
import org.eclipse.xtend.middleend.old.internal.xtendlib.XtendLibContributor;
/**
* This class manages the interdependent graph of parsed and converted files, allowing access to them by "compilation unit".
*
* @author Arno Haase (http://www.haase-consulting.com)
*/
public final class OldXtendRegistry implements LanguageSpecificMiddleEnd {
private final ExecutionContext _ctx;
@SuppressWarnings("unused")
private final MiddleEnd _middleEnd;
private BackendTypesystem _ts;
private final Cache<String, FunctionDefContextInternal> _functionDefContexts = new Cache<String, FunctionDefContextInternal> () {
@Override
protected FunctionDefContextInternal create (String compilationUnit) {
return new FunctionDefContextFactory (_ts).create();
}
};
/**
* all functions actually defined in a given compilation unit
*/
private final Map<String, List<NamedFunction>> _definedFunctionsByResource = new HashMap <String, List<NamedFunction>>();
/**
* all functions exported by a compilation unit, i.e. those functions visible to others that import it
*/
private final Map<String, List<NamedFunction>> _exportedFunctionsByResource = new HashMap <String, List<NamedFunction>>();
/**
* all locally defined functions that are exported by a compilation unit. This is an artifact to cleanly handle
* reexports.
*/
private final Map<String, List<NamedFunction>> _locallyExportedFunctionsByResource = new HashMap <String, List<NamedFunction>>();
private final Map<String, List<AroundAdvice>> _advice = new HashMap<String, List<AroundAdvice>> ();
/**
* the specificData field contains an ExecutionContext initialized with the MetaModels and the file encoding
*/
public OldXtendRegistry (MiddleEnd middleEnd, Object specificData) {
if (specificData == null)
throw new IllegalArgumentException (getName() + " middle end is not initialized - will not contribute");
_middleEnd = middleEnd;
_ts = middleEnd.getTypesystem();
_ctx = (ExecutionContext) specificData;
}
private FunctionDefContextInternal getFunctionDefContext (String xtendName) {
return _functionDefContexts.get (OldHelper.normalizeXtendResourceName (xtendName));
}
/**
* parses and converts an Xtend file and all other files it depends on.
*/
public void registerExtensionFile (String xtendFile) {
xtendFile = OldHelper.normalizeXtendResourceName (xtendFile);
if (_definedFunctionsByResource.containsKey (xtendFile))
return;
final ExtensionFile extensionFile = (ExtensionFile) _ctx.getResourceManager().loadResource (xtendFile, XtendFile.FILE_EXTENSION);
if (extensionFile == null)
throw new IllegalArgumentException ("could not find extension '" + xtendFile + "'");
final ExecutionContext ctx = _ctx.cloneWithResource (extensionFile);
final TypeToBackendType typeConverter = new TypeToBackendType (_ts, ctx);
final OldExtensionConverter extensionFactory = new OldExtensionConverter (ctx, typeConverter);
for (Extension ext: extensionFile.getExtensions())
ext.init (ctx);
final List<NamedFunction> defined = new ArrayList<NamedFunction>();
final List<NamedFunction> exported = new ArrayList<NamedFunction>();
final FunctionDefContextInternal fdc = getFunctionDefContext (xtendFile);
// register the XtendLib. Do this first so the extension can override functions
for (NamedFunction f: new XtendLibContributor (_ts).getContributedFunctions())
fdc.register (f, false);
fdc.register (new CheckConverter (ctx, typeConverter).createCheckFunction(_ts, fdc, extensionFile), false);
for (Extension ext: extensionFile.getExtensions()) {
final NamedFunction f = extensionFactory.create (ext, fdc);
defined.add(f);
if (!ext.isPrivate())
exported.add (f);
}
_definedFunctionsByResource.put (xtendFile, defined);
_exportedFunctionsByResource.put (xtendFile, exported);
_locallyExportedFunctionsByResource.put (xtendFile, new ArrayList<NamedFunction> (exported));
// make sure all imported resources are registered as well
for (String imported: extensionFile.getImportedExtensions())
registerExtensionFile (imported);
// make all imported extensions visible for the scope of this compilation unit
for (String importedResource: extensionFile.getImportedExtensions()) {
for (NamedFunction f: _locallyExportedFunctionsByResource.get (OldHelper.normalizeXtendResourceName (importedResource)))
fdc.register (f, false);
}
final Set<String> visitedForReexport = new HashSet<String>();
visitedForReexport.add (xtendFile);
final List<NamedFunction> reexported = new ArrayList<NamedFunction>();
getReexported (xtendFile, reexported, visitedForReexport, new HashSet<String>());
for (NamedFunction f: reexported) {
exported.add (f);
fdc.register (f, true);
}
final List<AroundAdvice> advice = new ArrayList<AroundAdvice> ();
_advice.put (xtendFile, advice);
for (Around a: extensionFile.getArounds())
advice.add (extensionFactory.create (a, fdc));
}
private void getReexported (String xtendFile, Collection<NamedFunction> result, Set<String> harvestedCompilationUnits, Set<String> processedCompilationUnits) {
xtendFile = OldHelper.normalizeXtendResourceName (xtendFile);
if (processedCompilationUnits.contains (xtendFile))
return;
processedCompilationUnits.add (xtendFile);
if (! harvestedCompilationUnits.contains (xtendFile)) {
for (NamedFunction f: _locallyExportedFunctionsByResource.get(xtendFile))
result.add (f);
harvestedCompilationUnits.add (xtendFile);
}
final ExtensionFile file = (ExtensionFile) _ctx.getResourceManager().loadResource (xtendFile, XtendFile.FILE_EXTENSION);
for (ImportStatement imp: file.getExtImports()) {
if (imp.isExported())
getReexported (imp.getImportedId().getValue(), result, harvestedCompilationUnits, processedCompilationUnits);
}
}
public boolean canHandle (String resourceName) {
resourceName = OldHelper.normalizeXtendResourceName (resourceName);
if (_definedFunctionsByResource.containsKey (resourceName))
return true;
try {
final ExtensionFile extensionFile = (ExtensionFile) _ctx.getResourceManager().loadResource (resourceName, XtendFile.FILE_EXTENSION);
return extensionFile != null;
}
catch (Exception exc) {
return false;
}
}
public FunctionDefContext getContributedFunctions (String xtendFile) {
registerExtensionFile (xtendFile);
return getFunctionDefContext(xtendFile);
}
public List<AroundAdvice> getContributedAdvice (String resourceName) {
registerExtensionFile (resourceName);
return _advice.get (OldHelper.normalizeXtendResourceName (resourceName));
}
public String getName () {
return "Xtend";
}
}
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