File: file_list.h

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/*
**	SWISH++
**	file_list.h
**
**	Copyright (C) 1998  Paul J. Lucas
**
**	This program 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 of the License, or
**	(at your option) any later version.
** 
**	This program 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 this program; if not, write to the Free Software
**	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#ifndef	file_list_H
#define	file_list_H

// standard
#include <cstddef>				/* for ptrdiff_t */
#include <iterator>
#include <sys/types.h>				/* for off_t */

// local
#include "fake_ansi.h"
#include "word_index.h"

//*****************************************************************************
//
// SYNOPSIS
//
	class file_list
//
// DESCRIPTION
//
//	This class, given a word_index::const_iterator, accesses the list of
//	files the word is in.  Once an instance is created, the list of files
//	can be iterated over.
//
// SEE ALSO
//
//	word_index.h
//	index.c		write_full_index() for a description of the index file
//			format.
//
//*****************************************************************************
{
public:
	////////// typedefs ///////////////////////////////////////////////////

	typedef int size_type;
	typedef ptrdiff_t difference_type;

	struct value_type {
		int		index;
		union {
			int	rank;
			int	occurrences;
		};
	};
	typedef value_type* pointer;
	typedef value_type const* const_pointer;
	typedef value_type& reference;
	typedef value_type const& const_reference;

	////////// constructors ///////////////////////////////////////////////

	file_list( word_index::const_iterator const &iter ) :
		ptr( *iter ), size_( -1 )
	{
		while ( *ptr++ ) ;		// skip past word
	}

	////////// member functions ///////////////////////////////////////////

	size_type size() const { return size_ != -1 ? size_ : calc_size(); }

	////////// iterators //////////////////////////////////////////////////

	class const_iterator;
	friend class const_iterator;

	class const_iterator :
		public forward_iterator< value_type, difference_type > {
	public:
		const_iterator() { }

		const_reference operator* () const { return  v_; }
		const_pointer   operator->() const { return &v_; }

		const_iterator& operator++();
		const_iterator  operator++(int) {
			const_iterator tmp = *this;
			return ++*this, tmp;
		}

		friend bool
		operator==( const_iterator const &i, const_iterator const &j ) {
			return i.c_ == j.c_;
		}

		friend bool
		operator!=( const_iterator const &i, const_iterator const &j ) {
			return !( i == j );
		}

	private:
		const_iterator( char const *p ) : c_( p ) {
			if ( c_ ) operator++();
		}
		char const *c_;
		value_type v_;
		friend class file_list;
	};

	const_iterator begin() const	{ return const_iterator( ptr ); }
	const_iterator end() const	{ return const_iterator( 0 ); }
private:
	char const *ptr;
	mutable size_type size_;

	size_type calc_size() const;
};

#endif	/* file_list_H */