/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the utils of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "lalr.h"
#include "dotgraph.h"
#include "parsetable.h"
#include "cppgenerator.h"
#include "recognizer.h"

#include <QtCore/qcoreapplication.h>
#include <QtCore/qfile.h>
#include <QtCore/qstringlist.h>
#include <QtCore/qdebug.h>

#include <cstdlib>

#define QLALR_NO_DEBUG_TABLE
#define QLALR_NO_DEBUG_DOT

static void help_me ()
{
  qerr << "Usage: qlalr [options] [input file name]" << endl
       << endl
       << "  --help, -h\t\tdisplay this help and exit" << endl
       << "  --verbose, -v\t\tverbose output" << endl
       << "  --no-debug\t\tno debug information" << endl
       << "  --no-lines\t\tno #line directives" << endl
       << "  --dot\t\t\tgenerate a graph" << endl
       << "  --qt\t\tadd the Qt copyright header and Qt-specific types and macros" << endl
       << endl;
  exit (0);
}

int main (int argc, char *argv[])
{
  QCoreApplication app (argc, argv);

  bool generate_dot = false;
  bool generate_report = false;
  bool no_lines = false;
  bool debug_info = true;
  bool qt_copyright = false;
  QString file_name = 0;

  QStringList args = app.arguments ();
  args.removeFirst ();

  foreach (QString arg, args)
    {
      if (arg == QLatin1String ("-h") || arg == QLatin1String ("--help"))
        help_me ();

      else if (arg == QLatin1String ("-v") || arg == QLatin1String ("--verbose"))
        generate_report = true;

      else if (arg == QLatin1String ("--dot"))
        generate_dot = true;

      else if (arg == QLatin1String ("--no-lines"))
        no_lines = true;

      else if (arg == QLatin1String ("--no-debug"))
        debug_info = false;

      else if (arg == QLatin1String ("--qt"))
        qt_copyright = true;

      else if (file_name.isEmpty ())
        file_name = arg;

      else
        qerr << "*** Warning. Ignore argument `" << arg << "'" << endl;
    }

  if (file_name.isEmpty ())
    {
      help_me ();
      exit (EXIT_SUCCESS);
    }

  Grammar grammar;
  Recognizer p (&grammar, no_lines);

  if (! p.parse (file_name))
    exit (EXIT_FAILURE);

  if (grammar.rules.isEmpty ())
    {
      qerr << "*** Fatal. No rules!" << endl;
      exit (EXIT_FAILURE);
    }

  else if (grammar.start == grammar.names.end ())
    {
      qerr << "*** Fatal. No start symbol!" << endl;
      exit (EXIT_FAILURE);
    }

  grammar.buildExtendedGrammar ();
  grammar.buildRuleMap ();

  Automaton aut (&grammar);
  aut.build ();

  CppGenerator gen (p, grammar, aut, generate_report);
  gen.setDebugInfo (debug_info);
  gen.setCopyright (qt_copyright);
  gen ();

  if (generate_dot)
    {
      DotGraph genDotFile (qout);
      genDotFile (&aut);
    }

  else if (generate_report)
    {
      ParseTable genParseTable (qout);
      genParseTable(&aut);
    }

  return EXIT_SUCCESS;
}

QString Recognizer::expand (const QString &text) const
{
  QString code = text;

  if (_M_grammar->start != _M_grammar->names.end ())
    {
      code = code.replace (QLatin1String("$start_id"), QString::number (std::distance (_M_grammar->names.begin (), _M_grammar->start)));
      code = code.replace (QLatin1String("$start"), *_M_grammar->start);
    }

  code = code.replace (QLatin1String("$header"), _M_grammar->table_name.toLower () + QLatin1String("_p.h"));

  code = code.replace (QLatin1String("$table"), _M_grammar->table_name);
  code = code.replace (QLatin1String("$parser"), _M_grammar->table_name);

  if (_M_current_rule != _M_grammar->rules.end ())
    {
      code = code.replace (QLatin1String("$rule_number"), QString::number (std::distance (_M_grammar->rules.begin (), _M_current_rule)));
      code = code.replace (QLatin1String("$rule"), *_M_current_rule->lhs);
    }

  return code;
}
