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/*
*
* Copyright (c) 2003
* John Maddock
*
* Use, modification and distribution are subject to 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)
*
*/
/*
* LOCATION: see http://www.boost.org for most recent version.
* FILE regex_iterator.hpp
* VERSION see <boost/version.hpp>
* DESCRIPTION: Provides regex_iterator implementation.
*/
#ifndef BOOST_REGEX_V4_REGEX_ITERATOR_HPP
#define BOOST_REGEX_V4_REGEX_ITERATOR_HPP
#include <boost/shared_ptr.hpp>
namespace boost{
#ifdef BOOST_MSVC
#pragma warning(push)
#pragma warning(disable: 4103)
#endif
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_PREFIX
#endif
#ifdef BOOST_MSVC
#pragma warning(pop)
#endif
template <class BidirectionalIterator,
class charT,
class traits>
class regex_iterator_implementation
{
typedef basic_regex<charT, traits> regex_type;
match_results<BidirectionalIterator> what; // current match
BidirectionalIterator base; // start of sequence
BidirectionalIterator end; // end of sequence
const regex_type re; // the expression
match_flag_type flags; // flags for matching
public:
regex_iterator_implementation(const regex_type* p, BidirectionalIterator last, match_flag_type f)
: base(), end(last), re(*p), flags(f){}
bool init(BidirectionalIterator first)
{
base = first;
return regex_search(first, end, what, re, flags);
}
bool compare(const regex_iterator_implementation& that)
{
if(this == &that) return true;
return (&re.get_data() == &that.re.get_data()) && (end == that.end) && (flags == that.flags) && (what[0].first == that.what[0].first) && (what[0].second == that.what[0].second);
}
const match_results<BidirectionalIterator>& get()
{ return what; }
bool next()
{
//if(what.prefix().first != what[0].second)
// flags |= match_prev_avail;
BidirectionalIterator next_start = what[0].second;
match_flag_type f(flags);
if(!what.length())
f |= regex_constants::match_not_initial_null;
//if(base != next_start)
// f |= regex_constants::match_not_bob;
bool result = regex_search(next_start, end, what, re, f, base);
if(result)
what.set_base(base);
return result;
}
private:
regex_iterator_implementation& operator=(const regex_iterator_implementation&);
};
template <class BidirectionalIterator,
class charT = BOOST_DEDUCED_TYPENAME re_detail::regex_iterator_traits<BidirectionalIterator>::value_type,
class traits = regex_traits<charT> >
class regex_iterator
#ifndef BOOST_NO_STD_ITERATOR
: public std::iterator<
std::forward_iterator_tag,
match_results<BidirectionalIterator>,
typename re_detail::regex_iterator_traits<BidirectionalIterator>::difference_type,
const match_results<BidirectionalIterator>*,
const match_results<BidirectionalIterator>& >
#endif
{
private:
typedef regex_iterator_implementation<BidirectionalIterator, charT, traits> impl;
typedef shared_ptr<impl> pimpl;
public:
typedef basic_regex<charT, traits> regex_type;
typedef match_results<BidirectionalIterator> value_type;
typedef typename re_detail::regex_iterator_traits<BidirectionalIterator>::difference_type
difference_type;
typedef const value_type* pointer;
typedef const value_type& reference;
typedef std::forward_iterator_tag iterator_category;
regex_iterator(){}
regex_iterator(BidirectionalIterator a, BidirectionalIterator b,
const regex_type& re,
match_flag_type m = match_default)
: pdata(new impl(&re, b, m))
{
if(!pdata->init(a))
{
pdata.reset();
}
}
regex_iterator(const regex_iterator& that)
: pdata(that.pdata) {}
regex_iterator& operator=(const regex_iterator& that)
{
pdata = that.pdata;
return *this;
}
bool operator==(const regex_iterator& that)const
{
if((pdata.get() == 0) || (that.pdata.get() == 0))
return pdata.get() == that.pdata.get();
return pdata->compare(*(that.pdata.get()));
}
bool operator!=(const regex_iterator& that)const
{ return !(*this == that); }
const value_type& operator*()const
{ return pdata->get(); }
const value_type* operator->()const
{ return &(pdata->get()); }
regex_iterator& operator++()
{
cow();
if(0 == pdata->next())
{
pdata.reset();
}
return *this;
}
regex_iterator operator++(int)
{
regex_iterator result(*this);
++(*this);
return result;
}
private:
pimpl pdata;
void cow()
{
// copy-on-write
if(pdata.get() && !pdata.unique())
{
pdata.reset(new impl(*(pdata.get())));
}
}
};
typedef regex_iterator<const char*> cregex_iterator;
typedef regex_iterator<std::string::const_iterator> sregex_iterator;
#ifndef BOOST_NO_WREGEX
typedef regex_iterator<const wchar_t*> wcregex_iterator;
typedef regex_iterator<std::wstring::const_iterator> wsregex_iterator;
#endif
// make_regex_iterator:
template <class charT, class traits>
inline regex_iterator<const charT*, charT, traits> make_regex_iterator(const charT* p, const basic_regex<charT, traits>& e, regex_constants::match_flag_type m = regex_constants::match_default)
{
return regex_iterator<const charT*, charT, traits>(p, p+traits::length(p), e, m);
}
template <class charT, class traits, class ST, class SA>
inline regex_iterator<typename std::basic_string<charT, ST, SA>::const_iterator, charT, traits> make_regex_iterator(const std::basic_string<charT, ST, SA>& p, const basic_regex<charT, traits>& e, regex_constants::match_flag_type m = regex_constants::match_default)
{
return regex_iterator<typename std::basic_string<charT, ST, SA>::const_iterator, charT, traits>(p.begin(), p.end(), e, m);
}
#ifdef BOOST_MSVC
#pragma warning(push)
#pragma warning(disable: 4103)
#endif
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_SUFFIX
#endif
#ifdef BOOST_MSVC
#pragma warning(pop)
#endif
} // namespace boost
#endif // BOOST_REGEX_V4_REGEX_ITERATOR_HPP
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