330 lines
12 KiB
Plaintext
330 lines
12 KiB
Plaintext
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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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// Copyright Samuel Krempp 2003. Use, modification, and distribution are
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// subject to the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org/libs/format for library home page
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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/config.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/format_class.hpp>
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#include <algorithm> // std::swap
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namespace boost {
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// --- basic_format implementation -----------------------------------------//
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template< class Ch, class Tr, class Alloc>
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basic_format<Ch, Tr, Alloc>:: basic_format(const Ch* s)
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: style_(0), cur_arg_(0), num_args_(0), dumped_(false),
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exceptions_(io::all_error_bits)
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{
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if( s)
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parse( s );
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}
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#if !defined(BOOST_NO_STD_LOCALE)
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template< class Ch, class Tr, class Alloc>
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basic_format<Ch, Tr, Alloc>:: basic_format(const Ch* s, const std::locale & loc)
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: style_(0), cur_arg_(0), num_args_(0), dumped_(false),
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exceptions_(io::all_error_bits), loc_(loc)
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{
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if(s) parse( s );
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}
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template< class Ch, class Tr, class Alloc>
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basic_format<Ch, Tr, Alloc>:: basic_format(const string_type& s, const std::locale & loc)
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: style_(0), cur_arg_(0), num_args_(0), dumped_(false),
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exceptions_(io::all_error_bits), loc_(loc)
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{
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parse(s);
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}
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#endif // ! BOOST_NO_STD_LOCALE
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template< class Ch, class Tr, class Alloc>
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io::detail::locale_t basic_format<Ch, Tr, Alloc>::
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getloc() const {
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return loc_ ? loc_.get() : io::detail::locale_t();
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}
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template< class Ch, class Tr, class Alloc>
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basic_format<Ch, Tr, Alloc>:: basic_format(const string_type& s)
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: style_(0), cur_arg_(0), num_args_(0), dumped_(false),
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exceptions_(io::all_error_bits)
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{
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parse(s);
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}
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template< class Ch, class Tr, class Alloc> // just don't copy the buf_ member
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basic_format<Ch, Tr, Alloc>:: basic_format(const basic_format& x)
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: items_(x.items_), bound_(x.bound_), style_(x.style_),
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cur_arg_(x.cur_arg_), num_args_(x.num_args_), dumped_(x.dumped_),
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prefix_(x.prefix_), exceptions_(x.exceptions_), loc_(x.loc_)
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{
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}
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template< class Ch, class Tr, class Alloc> // just don't copy the buf_ member
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basic_format<Ch, Tr, Alloc>& basic_format<Ch, Tr, Alloc>::
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operator= (const basic_format& x) {
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if(this == &x)
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return *this;
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(basic_format<Ch, Tr, Alloc>(x)).swap(*this);
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return *this;
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}
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template< class Ch, class Tr, class Alloc>
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void basic_format<Ch, Tr, Alloc>::
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swap (basic_format & x) {
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std::swap(exceptions_, x.exceptions_);
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std::swap(style_, x.style_);
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std::swap(cur_arg_, x.cur_arg_);
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std::swap(num_args_, x.num_args_);
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std::swap(dumped_, x.dumped_);
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items_.swap(x.items_);
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prefix_.swap(x.prefix_);
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bound_.swap(x.bound_);
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}
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template< class Ch, class Tr, class Alloc>
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unsigned char basic_format<Ch,Tr, Alloc>:: exceptions() const {
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return exceptions_;
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}
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template< class Ch, class Tr, class Alloc>
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unsigned char basic_format<Ch,Tr, Alloc>:: exceptions(unsigned char newexcept) {
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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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template<class Ch, class Tr, class Alloc>
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void basic_format<Ch, Tr, Alloc>::
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make_or_reuse_data (std::size_t nbitems) {
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#if !defined(BOOST_NO_STD_LOCALE)
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Ch fill = ( BOOST_USE_FACET(std::ctype<Ch>, getloc()) ). widen(' ');
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#else
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Ch fill = ' ';
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#endif
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if(items_.size() == 0)
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items_.assign( nbitems, format_item_t(fill) );
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else {
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if(nbitems>items_.size())
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items_.resize(nbitems, format_item_t(fill));
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bound_.resize(0);
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for(std::size_t i=0; i < nbitems; ++i)
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items_[i].reset(fill); // strings are resized, instead of reallocated
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}
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prefix_.resize(0);
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}
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template< class Ch, class Tr, class Alloc>
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basic_format<Ch,Tr, Alloc>& basic_format<Ch,Tr, Alloc>::
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clear () {
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// empty the string buffers (except bound arguments)
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// and make the format object ready for formatting a new set of arguments
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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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// clear converted strings only if the corresponding argument is not bound :
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if( bound_.size()==0 || items_[i].argN_<0 || !bound_[ items_[i].argN_ ] )
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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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for(; cur_arg_ < num_args_ && bound_[cur_arg_]; ++cur_arg_)
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{}
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}
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return *this;
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}
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template< class Ch, class Tr, class Alloc>
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basic_format<Ch,Tr, Alloc>& basic_format<Ch,Tr, Alloc>::
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clear_binds () {
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// remove all binds, then clear()
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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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template< class Ch, class Tr, class Alloc>
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basic_format<Ch,Tr, Alloc>& basic_format<Ch,Tr, Alloc>::
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clear_bind (int argN) {
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// remove the bind of ONE argument then clear()
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if(argN<1 || argN > num_args_ || bound_.size()==0 || !bound_[argN-1] ) {
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if( exceptions() & io::out_of_range_bit)
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boost::throw_exception(io::out_of_range(argN, 1, num_args_+1 ) );
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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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template< class Ch, class Tr, class Alloc>
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int basic_format<Ch,Tr, Alloc>::
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bound_args() const {
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if(bound_.size()==0)
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return 0;
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int n=0;
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for(int i=0; i<num_args_ ; ++i)
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if(bound_[i])
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++n;
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return n;
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}
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template< class Ch, class Tr, class Alloc>
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int basic_format<Ch,Tr, Alloc>::
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fed_args() const {
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if(bound_.size()==0)
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return cur_arg_;
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int n=0;
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for(int i=0; i<cur_arg_ ; ++i)
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if(!bound_[i])
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++n;
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return n;
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}
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template< class Ch, class Tr, class Alloc>
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int basic_format<Ch,Tr, Alloc>::
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cur_arg() const {
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return cur_arg_+1; }
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template< class Ch, class Tr, class Alloc>
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int basic_format<Ch,Tr, Alloc>::
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remaining_args() const {
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if(bound_.size()==0)
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return num_args_-cur_arg_;
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int n=0;
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for(int i=cur_arg_; i<num_args_ ; ++i)
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if(!bound_[i])
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++n;
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return n;
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}
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template< class Ch, class Tr, class Alloc>
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typename basic_format<Ch, Tr, Alloc>::string_type
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basic_format<Ch,Tr, Alloc>::
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str () const {
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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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// not enough variables supplied
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boost::throw_exception(io::too_few_args(cur_arg_, num_args_));
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unsigned long i;
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string_type res;
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res.reserve(size());
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res += prefix_;
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for(i=0; i < items_.size(); ++i) {
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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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BOOST_ASSERT( item.pad_scheme_ & format_item_t::tabulation);
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if( static_cast<size_type>(item.fmtstate_.width_) > res.size() )
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res.append( static_cast<size_type>(item.fmtstate_.width_) - res.size(),
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item.fmtstate_.fill_ );
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}
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res += item.appendix_;
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}
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dumped_=true;
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return res;
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}
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template< class Ch, class Tr, class Alloc>
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typename std::basic_string<Ch, Tr, Alloc>::size_type basic_format<Ch,Tr, Alloc>::
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size () const {
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#ifdef BOOST_MSVC
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// If std::min<unsigned> or std::max<unsigned> are already instantiated
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// at this point then we get a blizzard of warning messages when we call
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// those templates with std::size_t as arguments. Weird and very annoyning...
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#pragma warning(push)
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#pragma warning(disable:4267)
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#endif
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BOOST_USING_STD_MAX();
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size_type 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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const format_item_t& item = items_[i];
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sz += item.res_.size();
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if( item.argN_ == format_item_t::argN_tabulation)
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sz = max BOOST_PREVENT_MACRO_SUBSTITUTION (sz,
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static_cast<size_type>(item.fmtstate_.width_) );
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sz += item.appendix_.size();
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}
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return sz;
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#ifdef BOOST_MSVC
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#pragma warning(pop)
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#endif
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}
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namespace io {
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namespace detail {
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template<class Ch, class Tr, class Alloc, class T>
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basic_format<Ch, Tr, Alloc>&
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bind_arg_body (basic_format<Ch, Tr, Alloc>& self, int argN, 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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if(self.dumped_)
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self.clear(); // needed because we will modify cur_arg_
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if(argN<1 || argN > self.num_args_) {
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if( self.exceptions() & io::out_of_range_bit )
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boost::throw_exception(io::out_of_range(argN, 1, self.num_args_+1 ) );
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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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while(self.cur_arg_ < self.num_args_ && self.bound_[self.cur_arg_])
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++self.cur_arg_;
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}
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// In any case, we either have all args, or are on an unbound 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 Ch, class Tr, class Alloc, class T> basic_format<Ch, Tr, Alloc>&
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modify_item_body (basic_format<Ch, Tr, Alloc>& self, int itemN, 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 reset won't cancel that.
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if(itemN<1 || itemN > static_cast<signed int>(self.items_.size() )) {
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if( self.exceptions() & io::out_of_range_bit )
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boost::throw_exception(io::out_of_range(itemN, 1, static_cast<int>(self.items_.size()) ));
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else return self;
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}
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self.items_[itemN-1].fmtstate_. template apply_manip<T> ( manipulator );
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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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