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* s)
: style_(0), cur_arg_(0), num_args_(0), dumped_(false),
exceptions_(io::all_error_bits)
{
if( s)
parse( s );
}
#if !defined(BOOST_NO_STD_LOCALE)
template< class Ch, class Tr, class Alloc>
basic_format<Ch, Tr, Alloc>:: basic_format(const Ch* s, const std::locale & loc)
: style_(0), cur_arg_(0), num_args_(0), dumped_(false),
exceptions_(io::all_error_bits), loc_(loc)
{
if(s) parse( s );
}
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),
exceptions_(io::all_error_bits), loc_(loc)
{
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
}
prefix_.resize(0);
}
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 {
#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
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;
#ifdef BOOST_MSVC
#pragma warning(pop)
#endif
}
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, static_cast<int>(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