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/* CniPrintStream.java - PrintStream that emits CNI declarations

 Copyright (C) 2006 Free Software Foundation, Inc.

 This file is part of GNU Classpath.

 GNU Classpath is free software; you can redistribute it and/or modify

 it under the terms of the GNU General Public License as published by

 the Free Software Foundation; either version 2, or (at your option)

 any later version.

 GNU Classpath is distributed in the hope that it will be useful, but

 WITHOUT ANY WARRANTY; without even the implied warranty of

 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 General Public License for more details.

 You should have received a copy of the GNU General Public License

 along with GNU Classpath; see the file COPYING.  If not, write to the

 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

 02110-1301 USA.

 Linking this library statically or dynamically with other modules is

 making a combined work based on this library.  Thus, the terms and

 conditions of the GNU General Public License cover the whole

 combination.

 As a special exception, the copyright holders of this library give you

 permission to link this library with independent modules to produce an

 executable, regardless of the license terms of these independent

 modules, and to copy and distribute the resulting executable under

 terms of your choice, provided that you also meet, for each linked

 independent module, the terms and conditions of the license of that

 module.  An independent module is a module which is not derived from

 or based on this library.  If you modify this library, you may extend

 this exception to your version of the library, but you are not

 obligated to do so.  If you do not wish to do so, delete this

 exception statement from your version. */

package gnu.classpath.tools.javah;

import java.io.OutputStream;

import java.io.PrintStream;

import java.lang.reflect.Modifier;

import java.util.Arrays;

import java.util.HashSet;

import org.objectweb.asm.Type;

public class CniPrintStream

    extends PrintStream

{

  int currentModifiers = Modifier.PRIVATE;

  // True if we saw an array type.

  boolean sawArray;

  // All the classes referenced by this header.

  HashSet<String> allClasses = new HashSet<String>();

  String[] previousPackage = new String[0];

  public CniPrintStream(OutputStream out)

  {

    super(out);

  }

  public void addClass(ClassWrapper cw)

  {

    allClasses.add(cw.name);

  }

  public void setModifiers(int newMods)

  {

    newMods &= (Modifier.PUBLIC | Modifier.PROTECTED | Modifier.PRIVATE);

    if (newMods != currentModifiers)

      {

        switch (newMods)

          {

          case Modifier.PUBLIC:

            println("public:");

            break;

          case Modifier.PROTECTED:

            println("public: // actually protected");

            break;

          case Modifier.PRIVATE:

            println("private:");

            break;

          default:

            println("public: // actually package-private");

            break;

          }

        currentModifiers = newMods;

      }

  }

  private String getName(Type type)

  {

    if (type == Type.BOOLEAN_TYPE)

      return "jboolean";

    else if (type == Type.BYTE_TYPE)

      return "jbyte";

    else if (type == Type.CHAR_TYPE)

      return "jchar";

    else if (type == Type.SHORT_TYPE)

      return "jshort";

    else if (type == Type.INT_TYPE)

      return "jint";

    else if (type == Type.LONG_TYPE)

      return "jlong";

    else if (type == Type.FLOAT_TYPE)

      return "jfloat";

    else if (type == Type.DOUBLE_TYPE)

      return "jdouble";

    else

      {

        assert type == Type.VOID_TYPE;

        return "void";

      }

  }

  public String getClassName(Type type)

  {

    String name = type.toString();

    name = name.substring(1, name.length() - 1);

    // Add the plain class name; we'll handle it when

    // we process namespaces.

    allClasses.add(name);

    return name;

  }

  // Print the C++ form of TYPE, mangling C++ keywords.

  public void print(Type type)

  {

    int arrayCount = 0;

    if (type.getSort() == Type.ARRAY)

      {

        arrayCount = type.getDimensions();

        for (int i = 0; i < arrayCount; ++i)

          print("JArray< ");

        type = type.getElementType();

        sawArray = true;

      }

    if (type.getSort() == Type.OBJECT)

      {

        print("::");

        printName(getClassName(type));

        print(" *");

      }

    else

      {

        print(getName(type));

      }

    if (arrayCount > 0)

      {

        while (arrayCount-- > 0)

          {

            print(" > *");

          }

      }

  }

  // Print NAME, converting into C++ syntax and mangling C++ keywords

  // as we go.

  public final static void printName(PrintStream out, String name)

  {

    String[] parts = name.split("::|/");

    for (int i = 0; i < parts.length; i++)

      {

        if (i != 0)

          out.print("::");

        out.print(Keywords.getCxxName(parts[i]));

      }

  }

  // Println NAME, converting into C++ syntax and mangling C++

  // keywords as we go.

  public final static void printlnName(PrintStream out, String name)

  {

    printName(out, name);

    out.println();

  }

  // Print NAME, converting into C++ syntax and mangling C++ keywords

  // as we go.

  final void printName(String name)

  {

    printName(this, name);

  }

  private void indent(PrintStream out, int n)

  {

    for (int i = 0; i < n; ++i)

      {

        out.print("  ");

      }

  }

  private void moveToPackage(PrintStream out, String[] pkgParts)

  {

    // Find greatest common part.

    int commonIndex;

    for (commonIndex = 0; commonIndex < previousPackage.length; ++commonIndex)

      {

        if (commonIndex >= pkgParts.length)

          break;

        if (! previousPackage[commonIndex].equals(pkgParts[commonIndex]))

          break;

      }

    // Close old parts after the common part.

    for (int j = previousPackage.length - 1; j >= commonIndex; --j)

      {

        indent(out, j + 1);

        out.println("}");

      }

    // Open new parts.

    for (int j = commonIndex; j < pkgParts.length; ++j)

      {

        indent(out, j + 1);

        out.print("namespace ");

        printlnName(out, pkgParts[j]);

        indent(out, j + 1);

        out.println("{");

      }

    previousPackage = pkgParts;

  }

  private void writeClass(PrintStream out, String klass)

  {

    int index = klass.lastIndexOf('/');

    String pkg = index == -1 ? "" : klass.substring(0, index);

    String[] pkgParts = index == -1 ? new String[0] : pkg.split("/");

    String className = index == -1 ? klass : klass.substring(index + 1);

    moveToPackage(out, pkgParts);

    indent(out, pkgParts.length + 2);

    out.print("class ");

    printName(out, className);

    out.println(";");

  }

  public void printNamespaces(PrintStream out)

  {

    if (sawArray)

      {

        out.println("#include <gcj/array.h>");

        out.println();

      }

    String[] classes = allClasses.toArray(new String[0]);

    Arrays.sort(classes);

    boolean first = true;

    boolean seen = false;

    for (int i = 0; i < classes.length; ++i)

      {

        String klass = classes[i];

        if (klass.startsWith("java/lang/") || klass.startsWith("java/io/")

            || klass.startsWith("java/util/"))

          continue;

        if (first)

          {

            out.println("extern \"Java\"");

            out.println("{");

            first = false;

            seen = true;

          }

        writeClass(out, klass);

      }

    if (seen)

      {

        moveToPackage(out, new String[0]);

        out.println("}");

      }

  }

}