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/* ____ ____ ____ ____ ______ *\
** / __// __ \/ __// __ \/ ____/ SOcos COmpiles Scala **
** __\_ \/ /_/ / /__/ /_/ /\_ \ (c) 2002, LAMP/EPFL **
** /_____/\____/\___/\____/____/ **
\* */
// $Id$
package scalac.symtab.classfile;
import java.util.Iterator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map.Entry;
import scala.tools.util.AbstractFile;
import scalac.Global;
import scalac.symtab.Scope;
import scalac.symtab.SourceCompleter;
import scalac.symtab.Symbol;
import scalac.symtab.SymbolLoader;
import scalac.symtab.Type;
import scalac.util.Name;
import scalac.util.Debug;
/**
* This class implements a package member loader. It can be used to
* complete package class symbols.
*/
public class PackageParser extends SymbolLoader {
//########################################################################
// Protected Fields
/** The directory to read */
protected final AbstractFile directory;
/** A table to collect .scala files */
protected final HashMap/*<String,AbstractFile>*/ sources = new HashMap();
/** A table to collect .symbl files */
protected final HashMap/*<String,AbstractFile>*/ symbols = new HashMap();
/** A table to collect .class files */
protected final HashMap/*<String,AbstractFile>*/ classes = new HashMap();
/** A table to collect subdirectories */
protected final HashMap/*<String,AbstractFile>*/ packages = new HashMap();
//########################################################################
// Public Constructors
/** Initializes this instance. */
public PackageParser(Global global, AbstractFile directory) {
super(global);
this.directory = directory;
assert directory != null;
}
//########################################################################
// Protected Methods
/** Returns a new package parser for the given directory. */
protected PackageParser newPackageParser(AbstractFile directory) {
return new PackageParser(global, directory);
}
/**
* Collects all members of the package. This method is invoked by
* method "doComplete". It should not be invoked otherwise.
*/
protected void collectAllMembers(Symbol clasz) {
for (Iterator i = directory.list(); i.hasNext(); ) {
AbstractFile file = (AbstractFile)i.next();
String filename = file.getName();
if (file.isDirectory()) {
if (filename.equals("META-INF")) continue;
packages.put(filename, file);
continue;
}
if (filename.endsWith(".class")) {
String name = filename.substring(0, filename.length() - 6);
if (!classes.containsKey(name)) classes.put(name, file);
continue;
}
if (filename.endsWith(".symbl")) {
String name = filename.substring(0, filename.length() - 6);
if (!symbols.containsKey(name)) symbols.put(name, file);
continue;
}
if (filename.endsWith(".scala")) {
String name = filename.substring(0, filename.length() - 6);
if (!sources.containsKey(name)) sources.put(name, file);
continue;
}
}
}
/**
* Removes from the members collected by "collectAllMembers" all
* those that are hidden. This method is invoked by method
* "doComplete". It should not be invoked otherwise.
*/
protected void removeHiddenMembers(Symbol clasz) {
// Classes/Objects in the root package are hidden.
if (clasz.isRoot()) sources.clear();
if (clasz.isRoot()) symbols.clear();
if (clasz.isRoot()) classes.clear();
// For all files "<N>.class" find the longest M such that
// there is a file "<M>.symbl" and M equals N or "<M>$" is a
// prefix of N. If the file "<N>.class" is less recent than
// the file "<M>.symbl" ignore the ".class" file. Otherwise,
// if M equals N, ignore the ".symbl" file.
for (Iterator i = classes.entrySet().iterator(); i.hasNext(); ) {
Entry entry = (Entry)i.next();
String cname = (String)entry.getKey();
AbstractFile cfile = (AbstractFile)entry.getValue();
for (String zname = cname; true; ) {
AbstractFile zfile = (AbstractFile)symbols.get(zname);
if (zfile != null) {
if (cfile.lastModified() <= zfile.lastModified()) {
i.remove();
} else if (zname == cname) {
symbols.remove(zname);
}
break;
}
int index = zname.lastIndexOf('$');
if (index < 0) break;
zname = zname.substring(0, index);
}
}
// Source versions hide compiled versions except if separate
// compilation is enabled and the compiled version is more
// recent. In that case the compiled version hides the source
// version.
boolean separate = global.separate;
for (Iterator i = sources.entrySet().iterator(); i.hasNext(); ) {
HashMap.Entry entry = (HashMap.Entry)i.next();
String name = (String)entry.getKey();
AbstractFile sfile = (AbstractFile)entry.getValue();
AbstractFile zfile = (AbstractFile)symbols.get(name);
AbstractFile cfile = (AbstractFile)classes.get(name);
boolean hidden = false;
if (zfile != null)
if (separate && zfile.lastModified() > sfile.lastModified())
hidden = true;
else
symbols.remove(name);
if (cfile != null)
if (separate && cfile.lastModified() > sfile.lastModified())
hidden = true;
else
classes.remove(name);
if (hidden) i.remove();
}
// Packages are hidden by classes/objects with the same name.
packages.keySet().removeAll(sources.keySet());
packages.keySet().removeAll(symbols.keySet());
packages.keySet().removeAll(classes.keySet());
}
/**
* Creates symbols for all members left by method
* "removeHiddenMembers". This method is invoked by method
* "doComplete". It should not be invoked otherwise.
*/
protected Scope createMemberSymbols(Symbol clasz) {
Scope members = new Scope();
for (Iterator i = sources.entrySet().iterator(); i.hasNext(); ) {
HashMap.Entry entry = (HashMap.Entry)i.next();
String name = (String)entry.getKey();
AbstractFile sfile = (AbstractFile)entry.getValue();
Name classname = Name.fromString(name).toTypeName();
SymbolLoader loader = new SourceCompleter(global, sfile);
clasz.newLoadedClass(0, classname, loader, members);
}
for (Iterator i = symbols.entrySet().iterator(); i.hasNext(); ) {
HashMap.Entry entry = (HashMap.Entry)i.next();
String name = (String)entry.getKey();
AbstractFile zfile = (AbstractFile)entry.getValue();
Name classname = Name.fromString(name).toTypeName();
SymbolLoader loader = new SymblParser(global, zfile);
clasz.newLoadedClass(0, classname, loader, members);
}
for (Iterator i = classes.entrySet().iterator(); i.hasNext(); ) {
HashMap.Entry entry = (HashMap.Entry)i.next();
String name = (String)entry.getKey();
AbstractFile cfile = (AbstractFile)entry.getValue();
Name classname = Name.fromString(name).toTypeName();
SymbolLoader loader = new ClassParser(global, cfile);
clasz.newLoadedClass(JAVA, classname, loader, members);
}
for (Iterator i = packages.entrySet().iterator(); i.hasNext(); ) {
HashMap.Entry entry = (HashMap.Entry)i.next();
String name = (String)entry.getKey();
AbstractFile dfile = (AbstractFile)entry.getValue();
SymbolLoader loader = newPackageParser(dfile);
clasz.newLoadedPackage(Name.fromString(name), loader, members);
}
return members;
}
/** Completes the package symbol by loading all its members. */
protected String doComplete(Symbol root) {
assert root.isRoot() || root.isPackage(): Debug.show(root);
Symbol clasz = root.isRoot() ? root : root.moduleClass();
collectAllMembers(clasz);
removeHiddenMembers(clasz);
Scope members = createMemberSymbols(clasz);
clasz.setInfo(Type.compoundType(Type.EMPTY_ARRAY, members, clasz));
return "directory path '" + directory + "'";
}
//########################################################################
}
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