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// -*- C++ -*-
// Boost general library 'format' ---------------------------
// See http://www.boost.org for updates, documentation, and revision history.
// (C) Samuel Krempp 2001
// krempp@crans.ens-cachan.fr
// Permission to copy, use, modify, sell and
// distribute this software is granted provided this copyright notice appears
// in all copies. This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
// ideas taken from R�diger Loos's format class
// and Karl Nelson's ofstream (also took its parsing code as basis for printf parsing)
// ------------------------------------------------------------------------------
// format_class.hpp : class interface
// ------------------------------------------------------------------------------
#ifndef BOOST_FORMAT_CLASS_HPP
#define BOOST_FORMAT_CLASS_HPP
#include <vector>
#include <string>
#include <boost/format/format_fwd.hpp>
#include <boost/format/internals_fwd.hpp>
#include <boost/format/internals.hpp>
namespace boost {
template<class Ch, class Tr>
class basic_format
{
public:
typedef Ch CharT; // those 2 are necessary for borland compatibilty,
typedef Tr Traits; // in the body of the operator% template.
typedef std::basic_string<Ch, Tr> string_t;
typedef BOOST_IO_STD basic_ostringstream<Ch, Tr> internal_stream_t;
private:
typedef BOOST_IO_STD basic_ostream<Ch, Tr> stream_t;
typedef io::detail::stream_format_state<Ch, Tr> stream_format_state;
typedef io::detail::format_item<Ch, Tr> format_item_t;
public:
basic_format(const Ch* str);
basic_format(const string_t& s);
#ifndef BOOST_NO_STD_LOCALE
basic_format(const Ch* str, const std::locale & loc);
basic_format(const string_t& s, const std::locale & loc);
#endif // no locale
basic_format(const basic_format& x);
basic_format& operator= (const basic_format& x);
basic_format& clear(); // empty the string buffers (except bound arguments, see clear_binds() )
// pass arguments through those operators :
template<class T> basic_format& operator%(const T& x)
{
return io::detail::feed<CharT, Traits, const T&>(*this,x);
}
#ifndef BOOST_NO_OVERLOAD_FOR_NON_CONST
template<class T> basic_format& operator%(T& x)
{
return io::detail::feed<CharT, Traits, T&>(*this,x);
}
#endif
// system for binding arguments :
template<class T>
basic_format& bind_arg(int argN, const T& val)
{
return io::detail::bind_arg_body(*this, argN, val);
}
basic_format& clear_bind(int argN);
basic_format& clear_binds();
// modify the params of a directive, by applying a manipulator :
template<class T>
basic_format& modify_item(int itemN, const T& manipulator)
{
return io::detail::modify_item_body(*this, itemN, manipulator) ;
}
// Choosing which errors will throw exceptions :
unsigned char exceptions() const;
unsigned char exceptions(unsigned char newexcept);
// final output
string_t str() const;
friend BOOST_IO_STD basic_ostream<Ch, Tr>&
operator<< <Ch, Tr> ( BOOST_IO_STD basic_ostream<Ch, Tr>& , const basic_format& );
template<class Ch2, class Tr2, class T> friend basic_format<Ch2, Tr2>&
io::detail::feed(basic_format<Ch2,Tr2>&, T);
template<class Ch2, class Tr2, class T> friend
void io::detail::distribute(basic_format<Ch2,Tr2>&, T);
template<class Ch2, class Tr2, class T> friend
basic_format<Ch2, Tr2>& io::detail::modify_item_body(basic_format<Ch2, Tr2>&, int, const T&);
template<class Ch2, class Tr2, class T> friend
basic_format<Ch2, Tr2>& io::detail::bind_arg_body(basic_format<Ch2, Tr2>&, int, const T&);
// make the members private only if the friend templates are supported
private:
// flag bits, used for style_
enum style_values { ordered = 1, // set only if all directives are positional directives
special_needs = 4 };
// parse the format string :
void parse(const string_t&);
int style_; // style of format-string : positional or not, etc
int cur_arg_; // keep track of wich argument will come
int num_args_; // number of expected arguments
mutable bool dumped_; // true only after call to str() or <<
std::vector<format_item_t> items_; // vector of directives (aka items)
string_t prefix_; // piece of string to insert before first item
std::vector<bool> bound_; // stores which arguments were bound
// size = num_args OR zero
internal_stream_t oss_; // the internal stream.
stream_format_state state0_; // reference state for oss_
unsigned char exceptions_;
}; // class basic_format
} // namespace boost
#endif // BOOST_FORMAT_CLASS_HPP
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