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/*=============================================================================
Copyright (c) 2001-2011 Joel de Guzman
Copyright (c) 2011 Jan Frederick Eick
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
==============================================================================*/
#if !defined(BOOST_SPIRIT_NUMERIC_UTILS_APRIL_17_2006_0830AM)
#define BOOST_SPIRIT_NUMERIC_UTILS_APRIL_17_2006_0830AM
#if defined(_MSC_VER)
#pragma once
#endif
#include <boost/spirit/home/support/assert_msg.hpp>
#include <boost/spirit/home/qi/detail/assign_to.hpp>
#include <boost/spirit/home/qi/numeric/detail/numeric_utils.hpp>
#include <boost/assert.hpp>
#include <boost/mpl/assert.hpp>
namespace boost { namespace spirit { namespace qi
{
///////////////////////////////////////////////////////////////////////////
// Extract the prefix sign (- or +), return true if a '-' was found
///////////////////////////////////////////////////////////////////////////
template <typename Iterator>
inline bool
extract_sign(Iterator& first, Iterator const& last)
{
(void)last; // silence unused warnings
BOOST_ASSERT(first != last); // precondition
// Extract the sign
bool neg = *first == '-';
if (neg || (*first == '+'))
{
++first;
return neg;
}
return false;
}
///////////////////////////////////////////////////////////////////////////
// Low level unsigned integer parser
///////////////////////////////////////////////////////////////////////////
template <typename T, unsigned Radix, unsigned MinDigits, int MaxDigits
, bool Accumulate = false>
struct extract_uint
{
// check template parameter 'Radix' for validity
BOOST_SPIRIT_ASSERT_MSG(
Radix >= 2 && Radix <= 36,
not_supported_radix, ());
template <typename Iterator>
inline static bool call(Iterator& first, Iterator const& last, T& attr)
{
if (first == last)
return false;
typedef detail::extract_int<
T
, Radix
, MinDigits
, MaxDigits
, detail::positive_accumulator<Radix>
, Accumulate>
extract_type;
Iterator save = first;
if (!extract_type::parse(first, last,
detail::cast_unsigned<T>::call(attr)))
{
first = save;
return false;
}
return true;
}
template <typename Iterator, typename Attribute>
inline static bool call(Iterator& first, Iterator const& last, Attribute& attr_)
{
// this case is called when Attribute is not T
T attr;
if (call(first, last, attr))
{
traits::assign_to(attr, attr_);
return true;
}
return false;
}
};
///////////////////////////////////////////////////////////////////////////
// Low level signed integer parser
///////////////////////////////////////////////////////////////////////////
template <typename T, unsigned Radix, unsigned MinDigits, int MaxDigits>
struct extract_int
{
// check template parameter 'Radix' for validity
BOOST_SPIRIT_ASSERT_MSG(
Radix == 2 || Radix == 8 || Radix == 10 || Radix == 16,
not_supported_radix, ());
template <typename Iterator>
inline static bool call(Iterator& first, Iterator const& last, T& attr)
{
if (first == last)
return false;
typedef detail::extract_int<
T, Radix, MinDigits, MaxDigits>
extract_pos_type;
typedef detail::extract_int<
T, Radix, MinDigits, MaxDigits, detail::negative_accumulator<Radix> >
extract_neg_type;
Iterator save = first;
bool hit = extract_sign(first, last);
if (hit)
hit = extract_neg_type::parse(first, last, attr);
else
hit = extract_pos_type::parse(first, last, attr);
if (!hit)
{
first = save;
return false;
}
return true;
}
template <typename Iterator, typename Attribute>
inline static bool call(Iterator& first, Iterator const& last, Attribute& attr_)
{
// this case is called when Attribute is not T
T attr;
if (call(first, last, attr))
{
traits::assign_to(attr, attr_);
return true;
}
return false;
}
};
}}}
#endif
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