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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 */
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