/* -*- C++ -*-

 * lemon/bits/item_reader.h - Part of LEMON, a generic C++ optimization library

 *

 * Copyright (C) 2005 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

 * (Egervary Research Group on Combinatorial Optimization, EGRES).

 *

 * Permission to use, modify and distribute this software is granted

 * provided that this copyright notice appears in all copies. For

 * precise terms see the accompanying LICENSE file.

 *

 * This software is provided "AS IS" with no warranty of any kind,

 * express or implied, and with no claim as to its suitability for any

 * purpose.

 *

 */

/// \ingroup item_io

/// \file

/// \brief Item writer bits for lemon output.

#ifndef LEMON_BITS_ITEM_WRITER_H

#define LEMON_BITS_ITEM_WRITER_H

#include <iostream>

#include <string>

#include <vector>

#include <deque>

#include <list>

#include <set>

namespace lemon {

  template <typename Value>

  class DefaultWriter;

  /// \ingroup item_io

  /// \brief Writer class for quoted strings.

  ///

  /// Writer class for quoted strings. It can process the escape

  /// sequences in the string.

  /// \author Balazs Dezso

  class QuotedStringWriter {

  public:

    typedef std::string Value;

    /// \brief Constructor for the writer.

    ///

    /// Constructor for the writer. If the given parameter is true

    /// the writer creates escape sequences from special characters.

    QuotedStringWriter(bool _escaped = true) : escaped(_escaped) {}

    /// \brief Writes a quoted string to the given stream.

    ///

    /// Writes a quoted string to the given stream.

    void write(std::ostream& os, const std::string& value) {

      os << "\"";

      if (escaped) {

	std::ostringstream ls;

	for (int i = 0; i < (int)value.size(); ++i) {

	  writeEscape(ls, value[i]);

	}

	os << ls.str();

      } else {

	os << value;

      }

      os << "\"";

    }

  private:

    static void writeEscape(std::ostream& os, char c) {

      switch (c) {

      case '\\':

	os << "\\\\";

	return;

      case '\"':

	os << "\\\"";

	return;

      case '\'':

	os << "\\\'";

	return;

      case '\?':

	os << "\\\?";

	return;

      case '\a':

	os << "\\a";

	return;

      case '\b':

	os << "\\b";

	return;

      case '\f':

	os << "\\f";

	return;

      case '\r':

	os << "\\r";

	return;

      case '\n':

	os << "\\n";

	return;

      case '\t':

	os << "\\t";

	return;

      case '\v':

	os << "\\v";

	return;

      default:

	if (c < 0x20) {

	  os << '\\' << std::oct << (int)c;

	} else {

	  os << c;

	}

	return;

      }     

    }

  private:

    bool escaped;

  };

  /// \ingroup item_io

  ///

  /// \brief Writer for standard containers.

  ///

  /// Writer for each iterable standard containers. The representation

  /// of the container is the values enumerated between an open and a

  /// close parse. 

  ///

  /// \author Balazs Dezso

  template <

    typename _Container, 

    typename _ItemWriter = DefaultWriter<typename _Container::value_type> 

  >

  class IterableWriter {

  public:

    typedef _Container Value;

    typedef _ItemWriter ItemWriter;

  private:

    ItemWriter item_writer;

  public:

    /// \brief Writes the values of the container to the given stream.

    ///

    /// Writes the values of the container to the given stream.

    void write(std::ostream& os, const Value& value) const {

      typename Value::const_iterator it;

      os << '(';

      for (it = value.begin(); it != value.end(); ++it) {

	item_writer.write(os, *it);

	os << ' ';

      }

      os << ')';

    }

  };

  /// \ingroup item_io

  /// 

  /// \brief The default item writer template class.

  ///

  /// The default item writer template class. If some section writer

  /// needs to write a value to the stream it will give the default way for it.

  ///

  /// \author Balazs Dezso

  template <typename _Value>

  class DefaultWriter {

  public:

    /// The value type.

    typedef _Value Value;

    /// \brief Writes the value to the given stream.

    ///

    /// Writes the value to the given stream.

    void write(std::ostream& os, const Value& value) const {

      os << value;

    }

  };

  template <>

  class DefaultWriter<std::string> 

    : public QuotedStringWriter {};

  template <typename Item>

  class DefaultWriter<std::vector<Item> > 

    : public IterableWriter<std::vector<Item> > {};

  template <typename Item>

  class DefaultWriter<std::deque<Item> > 

    : public IterableWriter<std::deque<Item> > {};

  template <typename Item>

  class DefaultWriter<std::list<Item> > 

    : public IterableWriter<std::list<Item> > {};

  template <typename Item>

  class DefaultWriter<std::set<Item> > 

    : public IterableWriter<std::set<Item> > {};

  template <typename Item>

  class DefaultWriter<std::multiset<Item> > 

    : public IterableWriter<std::multiset<Item> > {};

  /// \ingroup item_io

  /// \brief Standard WriterTraits for the section writers.

  ///

  /// Standard WriterTraits for the section writers.

  /// It defines standard writing method for all type of value. 

  /// \author Balazs Dezso

  struct DefaultWriterTraits {

    template <typename _Value>

    struct Writer : DefaultWriter<_Value> {};

  };

}

#endif