boost/format/format_implementation.hpp
// -*- 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 R�diger 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/format_class.hpp>
#include <algorithm> // std::swap
namespace boost {
// -------- format:: -------------------------------------------
template< class Ch, class Tr>
basic_format<Ch, Tr>:: basic_format(const Ch* str)
: style_(0), cur_arg_(0), num_args_(0), dumped_(false),
exceptions_(io::all_error_bits)
{
if( str)
parse( str );
}
#ifndef BOOST_NO_STD_LOCALE
template< class Ch, class Tr>
basic_format<Ch, Tr>:: basic_format(const Ch* str, const std::locale & loc)
: style_(0), cur_arg_(0), num_args_(0), dumped_(false),
exceptions_(io::all_error_bits)
{
oss_.imbue( loc );
if(str) parse( str );
}
template< class Ch, class Tr>
basic_format<Ch, Tr>:: basic_format(const string_t& s, const std::locale & loc)
: style_(0), cur_arg_(0), num_args_(0), dumped_(false),
exceptions_(io::all_error_bits)
{
oss_.imbue( loc );
parse(s);
}
#endif //BOOST_NO_STD_LOCALE
template< class Ch, class Tr>
basic_format<Ch, Tr>:: basic_format(const string_t& s)
: style_(0), cur_arg_(0), num_args_(0), dumped_(false),
exceptions_(io::all_error_bits)
{
parse(s);
}
template< class Ch, class Tr>
basic_format<Ch, Tr>:: 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_)
{
}
template< class Ch, class Tr>
void basic_format<Ch, Tr>:: 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>
basic_format<Ch, Tr>& basic_format<Ch, Tr>:: operator= (const basic_format& x) {
if(this == &x)
return *this;
(basic_format<Ch, Tr>(x)).swap(*this);
return *this;
}
template< class Ch, class Tr>
unsigned char basic_format<Ch,Tr>:: exceptions() const {
return exceptions_;
}
template< class Ch, class Tr>
unsigned char basic_format<Ch,Tr>:: exceptions(unsigned char newexcept) {
unsigned char swp = exceptions_;
exceptions_ = newexcept;
return swp;
}
template<class Ch, class Tr>
void basic_format<Ch, Tr>:: make_or_reuse_data(std::size_t nbitems) {
Ch fill = oss_.widen(' ');
if(items_.size() == 0)
items_.assign( nbitems, format_item_t(fill) );
else {
bound_.resize(0);
items_.resize(nbitems, format_item_t(fill));
for(std::size_t i=0; i < nbitems; ++i)
items_[i].reset(fill); // strings are resized to "", instead of reallocated
}
}
template< class Ch, class Tr>
basic_format<Ch,Tr>& basic_format<Ch,Tr>:: 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 || !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;
}
template< class Ch, class Tr>
basic_format<Ch,Tr>& basic_format<Ch,Tr>:: clear_binds() {
// remove all binds, then clear()
bound_.resize(0);
clear();
return *this;
}
template< class Ch, class Tr>
basic_format<Ch,Tr>& basic_format<Ch,Tr>:: 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()); // arg not in range.
else return *this;
}
bound_[argN-1]=false;
clear();
return *this;
}
template< class Ch, class Tr>
std::basic_string<Ch,Tr> basic_format<Ch,Tr>:: 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 supplied
unsigned long i;
string_t 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);
std::streamsize n = item.fmtstate_.width_ - res.size();
if( n > 0 )
res.append( n, item.fmtstate_.fill_ );
}
res += item.appendix_;
}
return res;
}
template< class Ch, class Tr>
typename basic_format<Ch, Tr>::size_type basic_format<Ch,Tr>::
size () const {
std::streamsize 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 = std::max(sz, item.fmtstate_.width_);
sz += + item.appendix_.size();
}
return static_cast<size_type> (sz);
}
namespace io {
namespace detail {
template<class Ch, class Tr, class T>
basic_format<Ch, Tr>& bind_arg_body( basic_format<Ch, Tr>& 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 Ch, class Tr, class T>
basic_format<Ch, Tr>& modify_item_body( basic_format<Ch, Tr>& 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()); // item not in range.
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