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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 Rüdiger Loos's format class
-// and Karl Nelson's ofstream
-
-// ----------------------------------------------------------------------------
-// internals.hpp : internal structs. included by format.hpp
-// stream_format_state, and format_item
-// ----------------------------------------------------------------------------
-
-
-#ifndef BOOST_FORMAT_INTERNALS_HPP
-#define BOOST_FORMAT_INTERNALS_HPP
-
-
-#include <string>
-#include <sstream>
-
-namespace boost {
-namespace io {
-namespace detail {
-
-
-// --------------
-// set of params that define the format state of a stream
-
-struct stream_format_state
-{
- typedef std::ios basic_ios;
-
- std::streamsize width_;
- std::streamsize precision_;
- char fill_;
- std::ios::fmtflags flags_;
-
- stream_format_state() : width_(-1), precision_(-1), fill_(0), flags_(std::ios::dec) {}
- stream_format_state(basic_ios& os) {set_by_stream(os); }
-
- void apply_on(basic_ios & os) const; //- applies format_state to the stream
- template<class T> void apply_manip(T manipulator) //- modifies state by applying manipulator.
- { apply_manip_body<T>( *this, manipulator) ; }
- void reset(); //- sets to default state.
- void set_by_stream(const basic_ios& os); //- sets to os's state.
-};
-
-
-
-// --------------
-// format_item : stores all parameters that can be defined by directives in the format-string
-
-struct format_item
-{
- enum pad_values { zeropad = 1, spacepad =2, centered=4, tabulation = 8 };
-
- enum arg_values { argN_no_posit = -1, // non-positional directive. argN will be set later.
- argN_tabulation = -2, // tabulation directive. (no argument read)
- argN_ignored = -3 // ignored directive. (no argument read)
- };
- typedef BOOST_IO_STD ios basic_ios;
- typedef detail::stream_format_state stream_format_state;
- typedef std::string string_t;
- typedef BOOST_IO_STD ostringstream internal_stream_t;
-
-
- int argN_; //- argument number (starts at 0, eg : %1 => argN=0)
- // negative values are used for items that don't process
- // an argument
- string_t res_; //- result of the formatting of this item
- string_t appendix_; //- piece of string between this item and the next
-
- stream_format_state ref_state_;// set by parsing the format_string, is only affected by modify_item
- stream_format_state state_; // always same as ref_state, _unless_ modified by manipulators 'group(..)'
-
- // non-stream format-state parameters
- signed int truncate_; //- is >=0 for directives like %.5s (take 5 chars from the string)
- unsigned int pad_scheme_; //- several possible padding schemes can mix. see pad_values
-
- format_item() : argN_(argN_no_posit), truncate_(-1), pad_scheme_(0) {}
-
- void compute_states(); // sets states according to truncate and pad_scheme.
-};
-
-
-
-// -----------------------------------------------------------
-// Definitions
-// -----------------------------------------------------------
-
-// --- stream_format_state:: -------------------------------------------
-inline
-void stream_format_state::apply_on(basic_ios & os) const
- // set the state of this stream according to our params
-{
- if(width_ != -1)
- os.width(width_);
- if(precision_ != -1)
- os.precision(precision_);
- if(fill_ != 0)
- os.fill(fill_);
- os.flags(flags_);
-}
-
-inline
-void stream_format_state::set_by_stream(const basic_ios& os)
- // set our params according to the state of this stream
-{
- flags_ = os.flags();
- width_ = os.width();
- precision_ = os.precision();
- fill_ = os.fill();
-}
-
-template<class T> inline
-void apply_manip_body( stream_format_state& self,
- T manipulator)
- // modify our params according to the manipulator
-{
- BOOST_IO_STD stringstream ss;
- self.apply_on( ss );
- ss << manipulator;
- self.set_by_stream( ss );
-}
-
-inline
-void stream_format_state::reset()
- // set our params to standard's default state
-{
- width_=-1; precision_=-1; fill_=0;
- flags_ = std::ios::dec;
-}
-
-
-// --- format_items:: -------------------------------------------
-inline
-void format_item::compute_states()
- // reflect pad_scheme_ on state_ and ref_state_
- // because some pad_schemes has complex consequences on several state params.
-{
- if(pad_scheme_ & zeropad)
- {
- if(ref_state_.flags_ & std::ios::left)
- {
- pad_scheme_ = pad_scheme_ & (~zeropad); // ignore zeropad in left alignment
- }
- else
- {
- ref_state_.fill_='0';
- ref_state_.flags_ |= std::ios::internal;
- }
- }
- state_ = ref_state_;
-}
-
-
-} } } // namespaces boost :: io :: detail
-
-
-#endif // BOOST_FORMAT_INTERNALS_HPP