169 lines
6.9 KiB
C++
169 lines
6.9 KiB
C++
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// ----------------------------------------------------------------------------
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// format_class.hpp : class interface
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// ----------------------------------------------------------------------------
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// Copyright Samuel Krempp 2003. Use, modification, and distribution are
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// subject to the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org/libs/format for library home page
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// ----------------------------------------------------------------------------
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#ifndef BOOST_FORMAT_CLASS_HPP
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#define BOOST_FORMAT_CLASS_HPP
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#include <vector>
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#include <string>
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#include <boost/optional.hpp> // to store locale when needed
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#include <boost/format/format_fwd.hpp>
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#include <boost/format/internals_fwd.hpp>
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#include <boost/format/internals.hpp>
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#include <boost/format/alt_sstream.hpp>
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namespace boost {
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template<class Ch, class Tr, class Alloc>
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class basic_format
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{
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typedef typename io::CompatTraits<Tr>::compatible_type compat_traits;
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public:
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typedef Ch CharT; // borland fails in operator% if we use Ch and Tr directly
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typedef std::basic_string<Ch, Tr, Alloc> string_type;
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typedef typename string_type::size_type size_type;
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typedef io::detail::format_item<Ch, Tr, Alloc> format_item_t;
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typedef io::basic_altstringbuf<Ch, Tr, Alloc> internal_streambuf_t;
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explicit basic_format(const Ch* str=NULL);
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explicit basic_format(const string_type& s);
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basic_format(const basic_format& x);
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basic_format& operator= (const basic_format& x);
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void swap(basic_format& x);
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#if !defined(BOOST_NO_STD_LOCALE)
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explicit basic_format(const Ch* str, const std::locale & loc);
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explicit basic_format(const string_type& s, const std::locale & loc);
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#endif
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io::detail::locale_t getloc() const;
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basic_format& clear(); // empty all converted string buffers (except bound items)
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basic_format& clear_binds(); // unbind all bound items, and call clear()
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basic_format& parse(const string_type&); // resets buffers and parse a new format string
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// ** formatted result ** //
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size_type size() const; // sum of the current string pieces sizes
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string_type str() const; // final string
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// ** arguments passing ** //
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template<class T>
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basic_format& operator%(const T& x)
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{ return io::detail::feed<CharT, Tr, Alloc, const T&>(*this,x); }
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#ifndef BOOST_NO_OVERLOAD_FOR_NON_CONST
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template<class T> basic_format& operator%(T& x)
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{ return io::detail::feed<CharT, Tr, Alloc, T&>(*this,x); }
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#endif
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#if defined(__GNUC__)
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// GCC can't handle anonymous enums without some help
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// ** arguments passing ** //
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basic_format& operator%(const int& x)
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{ return io::detail::feed<CharT, Tr, Alloc, const int&>(*this,x); }
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#ifndef BOOST_NO_OVERLOAD_FOR_NON_CONST
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basic_format& operator%(int& x)
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{ return io::detail::feed<CharT, Tr, Alloc, int&>(*this,x); }
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#endif
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#endif
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// The total number of arguments expected to be passed to the format objectt
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int expected_args() const
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{ return num_args_; }
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// The number of arguments currently bound (see bind_arg(..) )
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int bound_args() const;
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// The number of arguments currently fed to the format object
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int fed_args() const;
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// The index (1-based) of the current argument (i.e. next to be formatted)
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int cur_arg() const;
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// The number of arguments still required to be fed
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int remaining_args() const; // same as expected_args() - bound_args() - fed_args()
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// ** object modifying **//
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template<class T>
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basic_format& bind_arg(int argN, const T& val)
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{ return io::detail::bind_arg_body(*this, argN, val); }
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basic_format& clear_bind(int argN);
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template<class T>
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basic_format& modify_item(int itemN, T manipulator)
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{ return io::detail::modify_item_body<Ch,Tr, Alloc, T> (*this, itemN, manipulator);}
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// Choosing which errors will throw exceptions :
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unsigned char exceptions() const;
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unsigned char exceptions(unsigned char newexcept);
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#if !defined( BOOST_NO_MEMBER_TEMPLATE_FRIENDS ) \
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&& !BOOST_WORKAROUND(__BORLANDC__, <= 0x570) \
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&& !BOOST_WORKAROUND( _CRAYC, != 0) \
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&& !BOOST_WORKAROUND(__DECCXX_VER, BOOST_TESTED_AT(60590042))
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// use friend templates and private members only if supported
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#ifndef BOOST_NO_TEMPLATE_STD_STREAM
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template<class Ch2, class Tr2, class Alloc2>
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friend std::basic_ostream<Ch2, Tr2> &
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operator<<( std::basic_ostream<Ch2, Tr2> & ,
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const basic_format<Ch2, Tr2, Alloc2>& );
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#else
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template<class Ch2, class Tr2, class Alloc2>
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friend std::ostream &
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operator<<( std::ostream & ,
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const basic_format<Ch2, Tr2, Alloc2>& );
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#endif
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template<class Ch2, class Tr2, class Alloc2, class T>
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friend basic_format<Ch2, Tr2, Alloc2>&
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io::detail::feed (basic_format<Ch2, Tr2, Alloc2>&, T);
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template<class Ch2, class Tr2, class Alloc2, class T> friend
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void io::detail::distribute (basic_format<Ch2, Tr2, Alloc2>&, T);
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template<class Ch2, class Tr2, class Alloc2, class T> friend
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basic_format<Ch2, Tr2, Alloc2>&
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io::detail::modify_item_body (basic_format<Ch2, Tr2, Alloc2>&, int, T);
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template<class Ch2, class Tr2, class Alloc2, class T> friend
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basic_format<Ch2, Tr2, Alloc2>&
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io::detail::bind_arg_body (basic_format<Ch2, Tr2, Alloc2>&, int, const T&);
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private:
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#endif
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typedef io::detail::stream_format_state<Ch, Tr> stream_format_state;
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// flag bits, used for style_
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enum style_values { ordered = 1, // set only if all directives are positional
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special_needs = 4 };
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void make_or_reuse_data(std::size_t nbitems);// used for (re-)initialisation
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// member data --------------------------------------------//
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std::vector<format_item_t> items_; // each '%..' directive leads to a format_item
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std::vector<bool> bound_; // stores which arguments were bound. size() == 0 || num_args
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int style_; // style of format-string : positional or not, etc
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int cur_arg_; // keep track of wich argument is current
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int num_args_; // number of expected arguments
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mutable bool dumped_; // true only after call to str() or <<
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string_type prefix_; // piece of string to insert before first item
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unsigned char exceptions_;
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internal_streambuf_t buf_; // the internal stream buffer.
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boost::optional<io::detail::locale_t> loc_;
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}; // class basic_format
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} // namespace boost
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#endif // BOOST_FORMAT_CLASS_HPP
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