/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the utils of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
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** accordance with the commercial license agreement provided with the
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** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
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****************************************************************************/

#include "parsetable.h"

#include "lalr.h"

#include <QtCore/qtextstream.h>

ParseTable::ParseTable (QTextStream &o):
  out (o)
{
}

void ParseTable::operator () (Automaton *aut)
{
  Grammar *g = aut->_M_grammar;

  int rindex = 1;
  for (RulePointer rule = g->rules.begin (); rule != g->rules.end (); ++rule)
    out << rindex++ << ")\t" << *rule << endl;
  out << endl << endl;

  int index = 0;
  for (StatePointer state = aut->states.begin (); state != aut->states.end (); ++state)
    {
      out << "state " << index++ << endl << endl;

      for (ItemPointer item = state->kernel.begin (); item != state->kernel.end (); ++item)
        {
          out << " *  " << *item;

          if (item->dot == item->end_rhs ())
            out << " " << aut->lookaheads [item];

          out << endl;
        }

      bool first = true;
      for (Bundle::iterator arrow = state->bundle.begin (); arrow != state->bundle.end (); ++arrow)
        {
          if (! g->isTerminal (arrow.key ()))
            continue;

          if (first)
            out << endl;

          first = false;

          out << "    " << *arrow.key () << " shift, and go to state " << std::distance (aut->states.begin (), *arrow) << endl;
        }

      first = true;
      for (ItemPointer item = state->closure.begin (); item != state->closure.end (); ++item)
        {
          if (item->dot != item->end_rhs () || item->rule == state->defaultReduce)
            continue;

          if (first)
            out << endl;

          first = false;

          const auto lookaheads = aut->lookaheads.value(item);
          for (const Name &la : lookaheads)
            out << "    " << *la << " reduce using rule " << aut->id (item->rule) << " (" << *item->rule->lhs << ")" << endl;
        }

      first = true;
      for (Bundle::iterator arrow = state->bundle.begin (); arrow != state->bundle.end (); ++arrow)
        {
          if (! g->isNonTerminal (arrow.key ()))
            continue;

          if (first)
            out << endl;

          first = false;

          out << "    " << *arrow.key () << " go to state " << std::distance (aut->states.begin (), *arrow) << endl;
        }

      if (state->defaultReduce != g->rules.end ())
        {
          out << endl
              << "    $default reduce using rule " << aut->id (state->defaultReduce) << " (" << *state->defaultReduce->lhs << ")" << endl;
        }

      out << endl;
    }
}