boost/format/format_implementation.hpp
// ---------------------------------------------------------------------------- // format_implementation.hpp Implementation of the basic_format class // ---------------------------------------------------------------------------- // 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_IMPLEMENTATION_HPP #define BOOST_FORMAT_IMPLEMENTATION_HPP #include <boost/config.hpp> #include <boost/throw_exception.hpp> #include <boost/assert.hpp> #include <boost/format/format_class.hpp> #include <algorithm> // std::swap namespace boost { // --- basic_format implementation -----------------------------------------// template< class Ch, class Tr, class Alloc> basic_format<Ch, Tr, Alloc>:: basic_format(const Ch* str) : style_(0), cur_arg_(0), num_args_(0), dumped_(false), exceptions_(io::all_error_bits) { if( str) parse( str ); } #if !defined(BOOST_NO_STD_LOCALE) template< class Ch, class Tr, class Alloc> basic_format<Ch, Tr, Alloc>:: basic_format(const Ch* str, const std::locale & loc) : style_(0), cur_arg_(0), num_args_(0), dumped_(false), loc_(loc), exceptions_(io::all_error_bits) { if(str) parse( str ); } template< class Ch, class Tr, class Alloc> basic_format<Ch, Tr, Alloc>:: basic_format(const string_type& s, const std::locale & loc) : style_(0), cur_arg_(0), num_args_(0), dumped_(false), loc_(loc), exceptions_(io::all_error_bits) { parse(s); } #endif // ! BOOST_NO_STD_LOCALE template< class Ch, class Tr, class Alloc> io::detail::locale_t basic_format<Ch, Tr, Alloc>:: getloc() const { return loc_ ? loc_.get() : io::detail::locale_t(); } template< class Ch, class Tr, class Alloc> basic_format<Ch, Tr, Alloc>:: basic_format(const string_type& s) : style_(0), cur_arg_(0), num_args_(0), dumped_(false), exceptions_(io::all_error_bits) { parse(s); } template< class Ch, class Tr, class Alloc> // just don't copy the buf_ member basic_format<Ch, Tr, Alloc>:: basic_format(const basic_format& x) : items_(x.items_), bound_(x.bound_), style_(x.style_), cur_arg_(x.cur_arg_), num_args_(x.num_args_), dumped_(false), prefix_(x.prefix_), exceptions_(x.exceptions_), loc_(x.loc_) { } template< class Ch, class Tr, class Alloc> // just don't copy the buf_ member basic_format<Ch, Tr, Alloc>& basic_format<Ch, Tr, Alloc>:: operator= (const basic_format& x) { if(this == &x) return *this; (basic_format<Ch, Tr, Alloc>(x)).swap(*this); return *this; } template< class Ch, class Tr, class Alloc> void basic_format<Ch, Tr, Alloc>:: swap (basic_format & x) { std::swap(exceptions_, x.exceptions_); std::swap(style_, x.style_); std::swap(cur_arg_, x.cur_arg_); std::swap(num_args_, x.num_args_); std::swap(dumped_, x.dumped_); items_.swap(x.items_); prefix_.swap(x.prefix_); bound_.swap(x.bound_); } template< class Ch, class Tr, class Alloc> unsigned char basic_format<Ch,Tr, Alloc>:: exceptions() const { return exceptions_; } template< class Ch, class Tr, class Alloc> unsigned char basic_format<Ch,Tr, Alloc>:: exceptions(unsigned char newexcept) { unsigned char swp = exceptions_; exceptions_ = newexcept; return swp; } template<class Ch, class Tr, class Alloc> void basic_format<Ch, Tr, Alloc>:: make_or_reuse_data (std::size_t nbitems) { #if !defined(BOOST_NO_STD_LOCALE) Ch fill = ( BOOST_USE_FACET(std::ctype<Ch>, getloc()) ). widen(' '); #else Ch fill = ' '; #endif if(items_.size() == 0) items_.assign( nbitems, format_item_t(fill) ); else { if(nbitems>items_.size()) items_.resize(nbitems, format_item_t(fill)); bound_.resize(0); for(std::size_t i=0; i < nbitems; ++i) items_[i].reset(fill); // strings are resized, instead of reallocated } } template< class Ch, class Tr, class Alloc> basic_format<Ch,Tr, Alloc>& basic_format<Ch,Tr, Alloc>:: clear () { // empty the string buffers (except bound arguments) // and make the format object ready for formatting a new set of arguments BOOST_ASSERT( bound_.size()==0 || num_args_ == static_cast<int>(bound_.size()) ); for(unsigned long i=0; i<items_.size(); ++i) { // clear converted strings only if the corresponding argument is not bound : if( bound_.size()==0 || items_[i].argN_<0 || !bound_[ items_[i].argN_ ] ) items_[i].res_.resize(0); } cur_arg_=0; dumped_=false; // maybe first arg is bound: if(bound_.size() != 0) { for(; cur_arg_ < num_args_ && bound_[cur_arg_]; ++cur_arg_) {} } return *this; } template< class Ch, class Tr, class Alloc> basic_format<Ch,Tr, Alloc>& basic_format<Ch,Tr, Alloc>:: clear_binds () { // remove all binds, then clear() bound_.resize(0); clear(); return *this; } template< class Ch, class Tr, class Alloc> basic_format<Ch,Tr, Alloc>& basic_format<Ch,Tr, Alloc>:: clear_bind (int argN) { // remove the bind of ONE argument then clear() if(argN<1 || argN > num_args_ || bound_.size()==0 || !bound_[argN-1] ) { if( exceptions() & io::out_of_range_bit) boost::throw_exception(io::out_of_range(argN, 1, num_args_+1 ) ); else return *this; } bound_[argN-1]=false; clear(); return *this; } template< class Ch, class Tr, class Alloc> typename basic_format<Ch, Tr, Alloc>::string_type basic_format<Ch,Tr, Alloc>:: str () const { if(items_.size()==0) return prefix_; if( cur_arg_ < num_args_) if( exceptions() & io::too_few_args_bit ) // not enough variables supplied boost::throw_exception(io::too_few_args(cur_arg_, num_args_)); unsigned long i; string_type res; res.reserve(size()); res += prefix_; for(i=0; i < items_.size(); ++i) { const format_item_t& item = items_[i]; res += item.res_; if( item.argN_ == format_item_t::argN_tabulation) { BOOST_ASSERT( item.pad_scheme_ & format_item_t::tabulation); if( static_cast<size_type>(item.fmtstate_.width_) > res.size() ) res.append( static_cast<size_type>(item.fmtstate_.width_) - res.size(), item.fmtstate_.fill_ ); } res += item.appendix_; } dumped_=true; return res; } template< class Ch, class Tr, class Alloc> typename std::basic_string<Ch, Tr, Alloc>::size_type basic_format<Ch,Tr, Alloc>:: size () const { BOOST_USING_STD_MAX(); size_type sz = prefix_.size(); unsigned long i; for(i=0; i < items_.size(); ++i) { const format_item_t& item = items_[i]; sz += item.res_.size(); if( item.argN_ == format_item_t::argN_tabulation) sz = max BOOST_PREVENT_MACRO_SUBSTITUTION (sz, static_cast<size_type>(item.fmtstate_.width_) ); sz += item.appendix_.size(); } return sz; } namespace io { namespace detail { template<class Ch, class Tr, class Alloc, class T> basic_format<Ch, Tr, Alloc>& bind_arg_body (basic_format<Ch, Tr, Alloc>& self, int argN, const T& val) { // bind one argument to a fixed value // this is persistent over clear() calls, thus also over str() and << if(self.dumped_) self.clear(); // needed because we will modify cur_arg_ if(argN<1 || argN > self.num_args_) { if( self.exceptions() & io::out_of_range_bit ) boost::throw_exception(io::out_of_range(argN, 1, self.num_args_+1 ) ); else return self; } if(self.bound_.size()==0) self.bound_.assign(self.num_args_,false); else BOOST_ASSERT( self.num_args_ == static_cast<signed int>(self.bound_.size()) ); int o_cur_arg = self.cur_arg_; self.cur_arg_ = argN-1; // arrays begin at 0 self.bound_[self.cur_arg_]=false; // if already set, we unset and re-sets.. self.operator%(val); // put val at the right place, because cur_arg is set // Now re-position cur_arg before leaving : self.cur_arg_ = o_cur_arg; self.bound_[argN-1]=true; if(self.cur_arg_ == argN-1 ) { // hum, now this arg is bound, so move to next free arg while(self.cur_arg_ < self.num_args_ && self.bound_[self.cur_arg_]) ++self.cur_arg_; } // In any case, we either have all args, or are on a non-binded arg : BOOST_ASSERT( self.cur_arg_ >= self.num_args_ || ! self.bound_[self.cur_arg_]); return self; } template<class Ch, class Tr, class Alloc, class T> basic_format<Ch, Tr, Alloc>& modify_item_body (basic_format<Ch, Tr, Alloc>& self, int itemN, T manipulator) { // applies a manipulator to the format_item describing a given directive. // this is a permanent change, clear or reset won't cancel that. if(itemN<1 || itemN > static_cast<signed int>(self.items_.size() )) { if( self.exceptions() & io::out_of_range_bit ) boost::throw_exception(io::out_of_range(itemN, 1, self.items_.size() )); else return self; } self.items_[itemN-1].fmtstate_. template apply_manip<T> ( manipulator ); return self; } } // namespace detail } // namespace io } // namespace boost #endif // BOOST_FORMAT_IMPLEMENTATION_HPP