diff options
Diffstat (limited to 'boost/format/format_implementation.cc')
| -rw-r--r-- | boost/format/format_implementation.cc | 256 |
1 files changed, 256 insertions, 0 deletions
diff --git a/boost/format/format_implementation.cc b/boost/format/format_implementation.cc new file mode 100644 index 000000000000..41cb5fc9fa2d --- /dev/null +++ b/boost/format/format_implementation.cc @@ -0,0 +1,256 @@ +// -*- 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 + +// ---------------------------------------------------------------------------- +// format_implementation.hpp Implementation of the basic_format class +// ---------------------------------------------------------------------------- + + +#ifndef BOOST_FORMAT_IMPLEMENTATION_HPP +#define BOOST_FORMAT_IMPLEMENTATION_HPP + +//#include <boost/throw_exception.hpp> +//#include <boost/assert.hpp> +#include <boost/format.hpp> + +namespace boost { + +// -------- format:: ------------------------------------------- +basic_format::basic_format(const char* str) + : style_(0), cur_arg_(0), num_args_(0), dumped_(false), + items_(), oss_(), exceptions_(io::all_error_bits) +{ + state0_.set_by_stream(oss_); + string_t emptyStr; + if( !str) str = emptyStr.c_str(); + parse( str ); +} + +#ifndef BOOST_NO_STD_LOCALE +basic_format::basic_format(const char* str, const std::locale & loc) + : style_(0), cur_arg_(0), num_args_(0), dumped_(false), + items_(), oss_(), exceptions_(io::all_error_bits) +{ + oss_.imbue( loc ); + state0_.set_by_stream(oss_); + string_t emptyStr; + if( !str) str = emptyStr.c_str(); + parse( str ); +} + +basic_format::basic_format(const string_t& s, const std::locale & loc) + : style_(0), cur_arg_(0), num_args_(0), dumped_(false), + items_(), oss_(), exceptions_(io::all_error_bits) +{ + oss_.imbue( loc ); + state0_.set_by_stream(oss_); + parse(s); +} +#endif //BOOST_NO_STD_LOCALE + +basic_format::basic_format(const string_t& s) + : style_(0), cur_arg_(0), num_args_(0), dumped_(false), + items_(), oss_(), exceptions_(io::all_error_bits) +{ + state0_.set_by_stream(oss_); + parse(s); +} + +basic_format:: basic_format(const basic_format& x) + : style_(x.style_), cur_arg_(x.cur_arg_), num_args_(x.num_args_), dumped_(false), + items_(x.items_), prefix_(x.prefix_), bound_(x.bound_), + oss_(), // <- we obviously can't copy x.oss_ + state0_(x.state0_), exceptions_(x.exceptions_) +{ + state0_.apply_on(oss_); +} + +basic_format& basic_format::operator= (const basic_format& x) +{ + if(this == &x) + return *this; + state0_ = x.state0_; + state0_.apply_on(oss_); + + // plus all the other (trivial) assignments : + exceptions_ = x.exceptions_; + items_ = x.items_; + prefix_ = x.prefix_; + bound_=x.bound_; + style_=x.style_; + cur_arg_=x.cur_arg_; + num_args_=x.num_args_; + dumped_=x.dumped_; + return *this; +} + + +unsigned char basic_format::exceptions() const +{ + return exceptions_; +} + +unsigned char basic_format::exceptions(unsigned char newexcept) +{ + unsigned char swp = exceptions_; + exceptions_ = newexcept; + return swp; +} + + +basic_format& basic_format ::clear() + // empty the string buffers (except bound arguments, see clear_binds() ) + // 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){ + items_[i].state_ = items_[i].ref_state_; + // clear converted strings only if the corresponding argument is not bound : + if( bound_.size()==0 || !bound_[ items_[i].argN_ ] ) items_[i].res_.resize(0); + } + cur_arg_=0; dumped_=false; + // maybe first arg is bound: + if(bound_.size() != 0) + { + while(cur_arg_ < num_args_ && bound_[cur_arg_] ) ++cur_arg_; + } + return *this; +} + +basic_format& basic_format ::clear_binds() + // cancel all bindings, and clear() +{ + bound_.resize(0); + clear(); + return *this; +} + +basic_format& basic_format::clear_bind(int argN) + // cancel the binding of ONE argument, and 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()); // arg not in range. + else return *this; + } + bound_[argN-1]=false; + clear(); + return *this; +} + + + +std::string basic_format::str() const +{ + dumped_=true; + if(items_.size()==0) + return prefix_; + if( cur_arg_ < num_args_) + if( exceptions() & io::too_few_args_bit ) + boost::throw_exception(io::too_few_args()); // not enough variables have been supplied ! + + unsigned long sz = prefix_.size(); + unsigned long i; + for(i=0; i < items_.size(); ++i) + sz += items_[i].res_.size() + items_[i].appendix_.size(); + string_t res; + res.reserve(sz); + + 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); + std::streamsize n = item.state_.width_ - res.size(); + if( n > 0 ) + res.append( n, item.state_.fill_ ); + } + res += item.appendix_; + } + return res; +} + +namespace io { +namespace detail { + +template<class T> +basic_format& bind_arg_body( basic_format& 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()); // arg not in range. + 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 T> +basic_format& modify_item_body( basic_format& self, + int itemN, + const T& manipulator) + // applies a manipulator to the format_item describing a given directive. + // this is a permanent change, clear or clear_binds 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()); // item not in range. + else return self; + } + self.items_[itemN-1].ref_state_.apply_manip( manipulator ); + self.items_[itemN-1].state_ = self.items_[itemN-1].ref_state_; + return self; +} + +} // namespace detail + +} // namespace io + +} // namespace boost + + + +#endif // BOOST_FORMAT_IMPLEMENTATION_HPP |