string_iterator.h

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/*
 * nvbio
 * Copyright (c) 2011-2014, NVIDIA CORPORATION. All rights reserved.
 * 
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 * modification, are permitted provided that the following conditions are met:
 *    * Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *    * Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *    * Neither the name of the NVIDIA CORPORATION nor the
 *      names of its contributors may be used to endorse or promote products
 *      derived from this software without specific prior written permission.
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 */

#pragma once

#include <nvbio/basic/types.h>
#include <nvbio/basic/iterator.h>
#include <nvbio/strings/string_traits.h>

namespace nvbio {


template <typename StringType>
struct string_iterator
{
    static const uint32 SYMBOL_SIZE = string_traits<StringType>::SYMBOL_SIZE;

    typedef StringType                                          string_type;
    typedef random_access_universal_iterator_tag                iterator_category; // TODO: determine the system from the string_traits
    typedef typename string_traits<StringType>::value_type      value_type;
    typedef typename string_traits<StringType>::reference       reference;
    typedef typename string_traits<StringType>::pointer         pointer;
    typedef typename string_traits<StringType>::index_type      index_type;
    typedef typename signed_type<index_type>::type              difference_type;
    typedef string_iterator<StringType>                         forward_iterator;

    NVBIO_FORCEINLINE NVBIO_HOST_DEVICE string_iterator()
        : m_index(index_type(-1)) {}

    NVBIO_FORCEINLINE NVBIO_HOST_DEVICE string_iterator(const StringType& string, const index_type index = 0)
        : m_string( string ), m_index(index) {}

    NVBIO_FORCEINLINE NVBIO_HOST_DEVICE reference operator[] (const index_type i) { return m_string[ m_index + i ]; }

    NVBIO_FORCEINLINE NVBIO_HOST_DEVICE reference operator[] (const index_type i) const { return m_string[ m_index + i ]; }

    NVBIO_FORCEINLINE NVBIO_HOST_DEVICE reference operator* () { return m_string[ m_index ]; }

    NVBIO_FORCEINLINE NVBIO_HOST_DEVICE reference operator* () const { return m_string[ m_index ]; }

public:
    string_type m_string;
    index_type  m_index;
};

template <typename StringType>
NVBIO_FORCEINLINE NVBIO_HOST_DEVICE 
string_iterator<StringType> make_string_iterator(const StringType& string)
{
    return string_iterator<StringType>( string );
}

template <typename StringType>
NVBIO_FORCEINLINE NVBIO_HOST_DEVICE bool operator< (
    const string_iterator<StringType>& it1,
    const string_iterator<StringType>& it2);

template <typename StringType>
NVBIO_FORCEINLINE NVBIO_HOST_DEVICE bool operator> (
    const string_iterator<StringType>& it1,
    const string_iterator<StringType>& it2);

template <typename StringType>
NVBIO_FORCEINLINE NVBIO_HOST_DEVICE bool operator<= (
    const string_iterator<StringType>& it1,
    const string_iterator<StringType>& it2);

template <typename StringType>
NVBIO_FORCEINLINE NVBIO_HOST_DEVICE bool operator>= (
    const string_iterator<StringType>& it1,
    const string_iterator<StringType>& it2);

template <typename StringType>
NVBIO_FORCEINLINE NVBIO_HOST_DEVICE bool operator== (
    const string_iterator<StringType>& it1,
    const string_iterator<StringType>& it2);

template <typename StringType>
NVBIO_FORCEINLINE NVBIO_HOST_DEVICE bool operator!= (
    const string_iterator<StringType>& it1,
    const string_iterator<StringType>& it2);

template <typename StringType>
NVBIO_FORCEINLINE NVBIO_HOST_DEVICE
string_iterator<StringType>& operator++ (string_iterator<StringType>& it);

template <typename StringType>
NVBIO_FORCEINLINE NVBIO_HOST_DEVICE
string_iterator<StringType> operator++ (string_iterator<StringType>& it, int dummy);

template <typename StringType>
NVBIO_FORCEINLINE NVBIO_HOST_DEVICE
string_iterator<StringType>& operator-- (string_iterator<StringType>& it);

template <typename StringType>
NVBIO_FORCEINLINE NVBIO_HOST_DEVICE
string_iterator<StringType> operator-- (string_iterator<StringType>& it, int dummy);

template <typename StringType>
NVBIO_FORCEINLINE NVBIO_HOST_DEVICE
string_iterator<StringType>& operator+= (string_iterator<StringType>& it, const typename string_iterator<StringType>::difference_type distance);

template <typename StringType>
NVBIO_FORCEINLINE NVBIO_HOST_DEVICE
string_iterator<StringType>& operator-= (string_iterator<StringType>& it, const typename string_iterator<StringType>::difference_type distance);

template <typename StringType>
NVBIO_FORCEINLINE NVBIO_HOST_DEVICE
string_iterator<StringType> operator+ (const string_iterator<StringType> it, const typename string_iterator<StringType>::difference_type distance);

template <typename StringType>
NVBIO_FORCEINLINE NVBIO_HOST_DEVICE
string_iterator<StringType> operator- (const string_iterator<StringType> it, const typename string_iterator<StringType>::difference_type distance);

template <typename StringType>
NVBIO_FORCEINLINE NVBIO_HOST_DEVICE
typename string_iterator<StringType>::difference_type operator- (const string_iterator<StringType> it1, const string_iterator<StringType> it2);


} // namespace nvbio

#include <nvbio/strings/string_iterator_inl.h>