| // ---------------------------------------------------------------------------- | |
| // feed_args.hpp : functions for processing each argument | |
| // (feed, feed_manip, and distribute) | |
| // ---------------------------------------------------------------------------- | |
| // Copyright Samuel Krempp 2003. 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) | |
| // See http://www.boost.org/libs/format for library home page | |
| // ---------------------------------------------------------------------------- | |
| #ifndef BOOST_FORMAT_FEED_ARGS_HPP | |
| #define BOOST_FORMAT_FEED_ARGS_HPP | |
| #include <boost/config.hpp> | |
| #include <boost/assert.hpp> | |
| #include <boost/throw_exception.hpp> | |
| #include <boost/format/format_class.hpp> | |
| #include <boost/format/group.hpp> | |
| #include <boost/format/detail/msvc_disambiguater.hpp> | |
| namespace boost { | |
| namespace io { | |
| namespace detail { | |
| template<class Ch, class Tr, class Alloc> | |
| void mk_str( std::basic_string<Ch,Tr, Alloc> & res, | |
| const Ch * beg, | |
| typename std::basic_string<Ch,Tr,Alloc>::size_type size, | |
| std::streamsize w, | |
| const Ch fill_char, | |
| std::ios_base::fmtflags f, | |
| const Ch prefix_space, // 0 if no space-padding | |
| bool center) | |
| // applies centered/left/right padding to the string [beg, beg+size[ | |
| // Effects : the result is placed in res. | |
| { | |
| typedef typename std::basic_string<Ch,Tr,Alloc>::size_type size_type; | |
| res.resize(0); | |
| if(w<=0 || static_cast<size_type>(w) <=size) { | |
| // no need to pad. | |
| res.reserve(size + !!prefix_space); | |
| if(prefix_space) | |
| res.append(1, prefix_space); | |
| if (size) | |
| res.append(beg, size); | |
| } | |
| else { | |
| std::streamsize n=static_cast<std::streamsize>(w-size-!!prefix_space); | |
| std::streamsize n_after = 0, n_before = 0; | |
| res.reserve(static_cast<size_type>(w)); // allocate once for the 2 inserts | |
| if(center) | |
| n_after = n/2, n_before = n - n_after; | |
| else | |
| if(f & std::ios_base::left) | |
| n_after = n; | |
| else | |
| n_before = n; | |
| // now make the res string : | |
| if(n_before) res.append(static_cast<size_type>(n_before), fill_char); | |
| if(prefix_space) | |
| res.append(1, prefix_space); | |
| if (size) | |
| res.append(beg, size); | |
| if(n_after) res.append(static_cast<size_type>(n_after), fill_char); | |
| } | |
| } // -mk_str(..) | |
| #if BOOST_WORKAROUND( BOOST_MSVC, <= 1300) || \ | |
| BOOST_WORKAROUND(__DECCXX_VER, BOOST_TESTED_AT(60590042)) | |
| // MSVC needs to be tricked to disambiguate this simple overload.. | |
| // the trick is in "boost/format/msvc_disambiguater.hpp" | |
| template< class Ch, class Tr, class T> inline | |
| void put_head (BOOST_IO_STD basic_ostream<Ch, Tr> & os, const T& x ) { | |
| disambiguater<Ch, Tr, T>::put_head(os, x, 1L); | |
| } | |
| template< class Ch, class Tr, class T> inline | |
| void put_last (BOOST_IO_STD basic_ostream<Ch, Tr> & os, const T& x ) { | |
| disambiguater<Ch, Tr, T>::put_last(os, x, 1L); | |
| } | |
| #else | |
| template< class Ch, class Tr, class T> inline | |
| void put_head (BOOST_IO_STD basic_ostream<Ch, Tr> &, const T& ) { | |
| } | |
| template< class Ch, class Tr, class T> inline | |
| void put_head( BOOST_IO_STD basic_ostream<Ch, Tr> & os, const group1<T>& x ) { | |
| os << group_head(x.a1_); // send the first N-1 items, not the last | |
| } | |
| template< class Ch, class Tr, class T> inline | |
| void put_last( BOOST_IO_STD basic_ostream<Ch, Tr> & os, const T& x ) { | |
| os << x ; | |
| } | |
| template< class Ch, class Tr, class T> inline | |
| void put_last( BOOST_IO_STD basic_ostream<Ch, Tr> & os, const group1<T>& x ) { | |
| os << group_last(x.a1_); // this selects the last element | |
| } | |
| #ifndef BOOST_NO_OVERLOAD_FOR_NON_CONST | |
| template< class Ch, class Tr, class T> inline | |
| void put_head( BOOST_IO_STD basic_ostream<Ch, Tr> &, T& ) { | |
| } | |
| template< class Ch, class Tr, class T> inline | |
| void put_last( BOOST_IO_STD basic_ostream<Ch, Tr> & os, T& x) { | |
| os << x ; | |
| } | |
| #endif | |
| #endif // -msvc workaround | |
| template< class Ch, class Tr, class Alloc, class T> | |
| void put( T x, | |
| const format_item<Ch, Tr, Alloc>& specs, | |
| typename basic_format<Ch, Tr, Alloc>::string_type& res, | |
| typename basic_format<Ch, Tr, Alloc>::internal_streambuf_t & buf, | |
| io::detail::locale_t *loc_p = NULL) | |
| { | |
| #ifdef BOOST_MSVC | |
| // If std::min<unsigned> or std::max<unsigned> are already instantiated | |
| // at this point then we get a blizzard of warning messages when we call | |
| // those templates with std::size_t as arguments. Weird and very annoyning... | |
| #pragma warning(push) | |
| #pragma warning(disable:4267) | |
| #endif | |
| // does the actual conversion of x, with given params, into a string | |
| // using the supplied stringbuf. | |
| typedef typename basic_format<Ch, Tr, Alloc>::string_type string_type; | |
| typedef typename basic_format<Ch, Tr, Alloc>::format_item_t format_item_t; | |
| typedef typename string_type::size_type size_type; | |
| basic_oaltstringstream<Ch, Tr, Alloc> oss( &buf); | |
| specs.fmtstate_.apply_on(oss, loc_p); | |
| // the stream format state can be modified by manipulators in the argument : | |
| put_head( oss, x ); | |
| // in case x is a group, apply the manip part of it, | |
| // in order to find width | |
| const std::ios_base::fmtflags fl=oss.flags(); | |
| const bool internal = (fl & std::ios_base::internal) != 0; | |
| const std::streamsize w = oss.width(); | |
| const bool two_stepped_padding= internal && (w!=0); | |
| res.resize(0); | |
| if(! two_stepped_padding) { | |
| if(w>0) // handle padding via mk_str, not natively in stream | |
| oss.width(0); | |
| put_last( oss, x); | |
| const Ch * res_beg = buf.pbase(); | |
| Ch prefix_space = 0; | |
| if(specs.pad_scheme_ & format_item_t::spacepad) | |
| if(buf.pcount()== 0 || | |
| (res_beg[0] !=oss.widen('+') && res_beg[0] !=oss.widen('-') )) | |
| prefix_space = oss.widen(' '); | |
| size_type res_size = (std::min)( | |
| static_cast<size_type>(specs.truncate_ - !!prefix_space), | |
| buf.pcount() ); | |
| mk_str(res, res_beg, res_size, w, oss.fill(), fl, | |
| prefix_space, (specs.pad_scheme_ & format_item_t::centered) !=0 ); | |
| } | |
| else { // 2-stepped padding | |
| // internal can be implied by zeropad, or user-set. | |
| // left, right, and centered alignment overrule internal, | |
| // but spacepad or truncate might be mixed with internal (using manipulator) | |
| put_last( oss, x); // may pad | |
| const Ch * res_beg = buf.pbase(); | |
| size_type res_size = buf.pcount(); | |
| bool prefix_space=false; | |
| if(specs.pad_scheme_ & format_item_t::spacepad) | |
| if(buf.pcount()== 0 || | |
| (res_beg[0] !=oss.widen('+') && res_beg[0] !=oss.widen('-') )) | |
| prefix_space = true; | |
| if(res_size == static_cast<size_type>(w) && w<=specs.truncate_ && !prefix_space) { | |
| // okay, only one thing was printed and padded, so res is fine | |
| res.assign(res_beg, res_size); | |
| } | |
| else { // length w exceeded | |
| // either it was multi-output with first output padding up all width.. | |
| // either it was one big arg and we are fine. | |
| // Note that res_size<w is possible (in case of bad user-defined formatting) | |
| res.assign(res_beg, res_size); | |
| res_beg=NULL; // invalidate pointers. | |
| // make a new stream, to start re-formatting from scratch : | |
| buf.clear_buffer(); | |
| basic_oaltstringstream<Ch, Tr, Alloc> oss2( &buf); | |
| specs.fmtstate_.apply_on(oss2, loc_p); | |
| put_head( oss2, x ); | |
| oss2.width(0); | |
| if(prefix_space) | |
| oss2 << ' '; | |
| put_last(oss2, x ); | |
| if(buf.pcount()==0 && specs.pad_scheme_ & format_item_t::spacepad) { | |
| prefix_space =true; | |
| oss2 << ' '; | |
| } | |
| // we now have the minimal-length output | |
| const Ch * tmp_beg = buf.pbase(); | |
| size_type tmp_size = (std::min)(static_cast<size_type>(specs.truncate_), | |
| buf.pcount() ); | |
| if(static_cast<size_type>(w) <= tmp_size) { | |
| // minimal length is already >= w, so no padding (cool!) | |
| res.assign(tmp_beg, tmp_size); | |
| } | |
| else { // hum.. we need to pad (multi_output, or spacepad present) | |
| //find where we should pad | |
| size_type sz = (std::min)(res_size + (prefix_space ? 1 : 0), tmp_size); | |
| size_type i = prefix_space; | |
| for(; i<sz && tmp_beg[i] == res[i - (prefix_space ? 1 : 0)]; ++i) {} | |
| if(i>=tmp_size) i=prefix_space; | |
| res.assign(tmp_beg, i); | |
| std::streamsize d = w - static_cast<std::streamsize>(tmp_size); | |
| BOOST_ASSERT(d>0); | |
| res.append(static_cast<size_type>( d ), oss2.fill()); | |
| res.append(tmp_beg+i, tmp_size-i); | |
| BOOST_ASSERT(i+(tmp_size-i)+(std::max)(d,(std::streamsize)0) | |
| == static_cast<size_type>(w)); | |
| BOOST_ASSERT(res.size() == static_cast<size_type>(w)); | |
| } | |
| } | |
| } | |
| buf.clear_buffer(); | |
| #ifdef BOOST_MSVC | |
| #pragma warning(pop) | |
| #endif | |
| } // end- put(..) | |
| template< class Ch, class Tr, class Alloc, class T> | |
| void distribute (basic_format<Ch,Tr, Alloc>& self, T x) { | |
| // call put(x, ..) on every occurence of the current argument : | |
| if(self.cur_arg_ >= self.num_args_) { | |
| if( self.exceptions() & too_many_args_bit ) | |
| boost::throw_exception(too_many_args(self.cur_arg_, self.num_args_)); | |
| else return; | |
| } | |
| for(unsigned long i=0; i < self.items_.size(); ++i) { | |
| if(self.items_[i].argN_ == self.cur_arg_) { | |
| put<Ch, Tr, Alloc, T> (x, self.items_[i], self.items_[i].res_, | |
| self.buf_, boost::get_pointer(self.loc_) ); | |
| } | |
| } | |
| } | |
| template<class Ch, class Tr, class Alloc, class T> | |
| basic_format<Ch, Tr, Alloc>& | |
| feed (basic_format<Ch,Tr, Alloc>& self, T x) { | |
| if(self.dumped_) self.clear(); | |
| distribute<Ch, Tr, Alloc, T> (self, x); | |
| ++self.cur_arg_; | |
| if(self.bound_.size() != 0) { | |
| while( self.cur_arg_ < self.num_args_ && self.bound_[self.cur_arg_] ) | |
| ++self.cur_arg_; | |
| } | |
| return self; | |
| } | |
| } // namespace detail | |
| } // namespace io | |
| } // namespace boost | |
| #endif // BOOST_FORMAT_FEED_ARGS_HPP |