256 lines
7.6 KiB
C++
256 lines
7.6 KiB
C++
// -*- C++ -*-
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// Boost general library format ---------------------------
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// See http://www.boost.org for updates, documentation, and revision history.
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// (C) Samuel Krempp 2001
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// krempp@crans.ens-cachan.fr
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// Permission to copy, use, modify, sell and
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// distribute this software is granted provided this copyright notice appears
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// in all copies. This software is provided "as is" without express or implied
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// warranty, and with no claim as to its suitability for any purpose.
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// ideas taken from Rüdiger Loos's format class
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// and Karl Nelson's ofstream
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// ----------------------------------------------------------------------------
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// format_implementation.hpp Implementation of the basic_format class
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// ----------------------------------------------------------------------------
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#ifndef BOOST_FORMAT_IMPLEMENTATION_HPP
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#define BOOST_FORMAT_IMPLEMENTATION_HPP
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#include <boost/throw_exception.hpp>
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#include <boost/assert.hpp>
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#include <boost/format.hpp>
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namespace boost {
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// -------- format:: -------------------------------------------
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basic_format::basic_format(const char* str)
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: style_(0), cur_arg_(0), num_args_(0), dumped_(false),
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items_(), oss_(), exceptions_(io::all_error_bits)
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{
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state0_.set_by_stream(oss_);
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string_t emptyStr;
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if( !str) str = emptyStr.c_str();
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parse( str );
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}
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#ifndef BOOST_NO_STD_LOCALE
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basic_format::basic_format(const char* str, const std::locale & loc)
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: style_(0), cur_arg_(0), num_args_(0), dumped_(false),
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items_(), oss_(), exceptions_(io::all_error_bits)
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{
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oss_.imbue( loc );
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state0_.set_by_stream(oss_);
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string_t emptyStr;
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if( !str) str = emptyStr.c_str();
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parse( str );
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}
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basic_format::basic_format(const string_t& s, const std::locale & loc)
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: style_(0), cur_arg_(0), num_args_(0), dumped_(false),
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items_(), oss_(), exceptions_(io::all_error_bits)
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{
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oss_.imbue( loc );
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state0_.set_by_stream(oss_);
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parse(s);
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}
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#endif //BOOST_NO_STD_LOCALE
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basic_format::basic_format(const string_t& s)
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: style_(0), cur_arg_(0), num_args_(0), dumped_(false),
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items_(), oss_(), exceptions_(io::all_error_bits)
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{
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state0_.set_by_stream(oss_);
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parse(s);
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}
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basic_format:: basic_format(const basic_format& x)
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: style_(x.style_), cur_arg_(x.cur_arg_), num_args_(x.num_args_), dumped_(false),
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items_(x.items_), prefix_(x.prefix_), bound_(x.bound_),
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oss_(), // <- we obviously can't copy x.oss_
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state0_(x.state0_), exceptions_(x.exceptions_)
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{
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state0_.apply_on(oss_);
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}
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basic_format& basic_format::operator= (const basic_format& x)
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{
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if(this == &x)
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return *this;
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state0_ = x.state0_;
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state0_.apply_on(oss_);
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// plus all the other (trivial) assignments :
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exceptions_ = x.exceptions_;
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items_ = x.items_;
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prefix_ = x.prefix_;
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bound_=x.bound_;
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style_=x.style_;
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cur_arg_=x.cur_arg_;
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num_args_=x.num_args_;
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dumped_=x.dumped_;
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return *this;
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}
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unsigned char basic_format::exceptions() const
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{
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return exceptions_;
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}
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unsigned char basic_format::exceptions(unsigned char newexcept)
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{
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unsigned char swp = exceptions_;
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exceptions_ = newexcept;
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return swp;
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}
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basic_format& basic_format ::clear()
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// empty the string buffers (except bound arguments, see clear_binds() )
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// and make the format object ready for formatting a new set of arguments
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{
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BOOST_ASSERT( bound_.size()==0 || num_args_ == static_cast<int>(bound_.size()) );
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for(unsigned long i=0; i<items_.size(); ++i){
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items_[i].state_ = items_[i].ref_state_;
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// clear converted strings only if the corresponding argument is not bound :
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if( bound_.size()==0 || !bound_[ items_[i].argN_ ] ) items_[i].res_.resize(0);
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}
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cur_arg_=0; dumped_=false;
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// maybe first arg is bound:
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if(bound_.size() != 0)
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{
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while(cur_arg_ < num_args_ && bound_[cur_arg_] ) ++cur_arg_;
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}
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return *this;
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}
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basic_format& basic_format ::clear_binds()
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// cancel all bindings, and clear()
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{
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bound_.resize(0);
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clear();
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return *this;
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}
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basic_format& basic_format::clear_bind(int argN)
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// cancel the binding of ONE argument, and clear()
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{
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if(argN<1 || argN > num_args_ || bound_.size()==0 || !bound_[argN-1] )
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{
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if( exceptions() & io::out_of_range_bit )
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boost::throw_exception(io::out_of_range()); // arg not in range.
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else return *this;
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}
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bound_[argN-1]=false;
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clear();
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return *this;
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}
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std::string basic_format::str() const
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{
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dumped_=true;
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if(items_.size()==0)
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return prefix_;
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if( cur_arg_ < num_args_)
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if( exceptions() & io::too_few_args_bit )
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boost::throw_exception(io::too_few_args()); // not enough variables have been supplied !
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unsigned long sz = prefix_.size();
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unsigned long i;
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for(i=0; i < items_.size(); ++i)
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sz += items_[i].res_.size() + items_[i].appendix_.size();
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string_t res;
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res.reserve(sz);
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res += prefix_;
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for(i=0; i < items_.size(); ++i)
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{
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const format_item_t& item = items_[i];
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res += item.res_;
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if( item.argN_ == format_item_t::argN_tabulation)
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{
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BOOST_ASSERT( item.pad_scheme_ & format_item_t::tabulation);
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std::streamsize n = item.state_.width_ - res.size();
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if( n > 0 )
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res.append( n, item.state_.fill_ );
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}
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res += item.appendix_;
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}
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return res;
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}
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namespace io {
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namespace detail {
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template<class T>
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basic_format& bind_arg_body( basic_format& self,
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int argN,
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const T& val)
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// bind one argument to a fixed value
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// this is persistent over clear() calls, thus also over str() and <<
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{
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if(self.dumped_) self.clear(); // needed, because we will modify cur_arg_..
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if(argN<1 || argN > self.num_args_)
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{
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if( self.exceptions() & io::out_of_range_bit )
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boost::throw_exception(io::out_of_range()); // arg not in range.
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else return self;
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}
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if(self.bound_.size()==0)
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self.bound_.assign(self.num_args_,false);
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else
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BOOST_ASSERT( self.num_args_ == static_cast<signed int>(self.bound_.size()) );
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int o_cur_arg = self.cur_arg_;
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self.cur_arg_ = argN-1; // arrays begin at 0
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self.bound_[self.cur_arg_]=false; // if already set, we unset and re-sets..
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self.operator%(val); // put val at the right place, because cur_arg is set
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// Now re-position cur_arg before leaving :
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self.cur_arg_ = o_cur_arg;
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self.bound_[argN-1]=true;
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if(self.cur_arg_ == argN-1 )
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// hum, now this arg is bound, so move to next free arg
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{
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while(self.cur_arg_ < self.num_args_ && self.bound_[self.cur_arg_]) ++self.cur_arg_;
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}
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// In any case, we either have all args, or are on a non-binded arg :
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BOOST_ASSERT( self.cur_arg_ >= self.num_args_ || ! self.bound_[self.cur_arg_]);
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return self;
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}
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template<class T>
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basic_format& modify_item_body( basic_format& self,
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int itemN,
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const T& manipulator)
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// applies a manipulator to the format_item describing a given directive.
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// this is a permanent change, clear or clear_binds won't cancel that.
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{
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if(itemN<1 || itemN >= static_cast<signed int>(self.items_.size() ))
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{
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if( self.exceptions() & io::out_of_range_bit )
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boost::throw_exception(io::out_of_range()); // item not in range.
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else return self;
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}
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self.items_[itemN-1].ref_state_.apply_manip( manipulator );
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self.items_[itemN-1].state_ = self.items_[itemN-1].ref_state_;
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return self;
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}
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} // namespace detail
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} // namespace io
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} // namespace boost
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#endif // BOOST_FORMAT_IMPLEMENTATION_HPP
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