1 // ----------------------------------------------------------------------------
2 // format_implementation.hpp Implementation of the basic_format class
3 // ----------------------------------------------------------------------------
5 // Copyright Samuel Krempp 2003. Use, modification, and distribution are
6 // subject to the Boost Software License, Version 1.0. (See accompanying
7 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
9 // See http://www.boost.org/libs/format for library home page
12 // ----------------------------------------------------------------------------
14 #ifndef BOOST_FORMAT_IMPLEMENTATION_HPP
15 #define BOOST_FORMAT_IMPLEMENTATION_HPP
17 #include <boost/config.hpp>
18 #include <boost/throw_exception.hpp>
19 #include <boost/assert.hpp>
20 #include <boost/format/format_class.hpp>
21 #include <algorithm> // std::swap
25 // --- basic_format implementation -----------------------------------------//
27 template< class Ch, class Tr, class Alloc>
28 basic_format<Ch, Tr, Alloc>:: basic_format(const Ch* str)
29 : style_(0), cur_arg_(0), num_args_(0), dumped_(false),
30 exceptions_(io::all_error_bits)
36 #if !defined(BOOST_NO_STD_LOCALE)
37 template< class Ch, class Tr, class Alloc>
38 basic_format<Ch, Tr, Alloc>:: basic_format(const Ch* str, const std::locale & loc)
39 : style_(0), cur_arg_(0), num_args_(0), dumped_(false),
40 loc_(loc), exceptions_(io::all_error_bits)
45 template< class Ch, class Tr, class Alloc>
46 basic_format<Ch, Tr, Alloc>:: basic_format(const string_type& s, const std::locale & loc)
47 : style_(0), cur_arg_(0), num_args_(0), dumped_(false),
48 loc_(loc), exceptions_(io::all_error_bits)
52 #endif // ! BOOST_NO_STD_LOCALE
53 template< class Ch, class Tr, class Alloc>
54 io::detail::locale_t basic_format<Ch, Tr, Alloc>::
56 return loc_ ? loc_.get() : io::detail::locale_t();
59 template< class Ch, class Tr, class Alloc>
60 basic_format<Ch, Tr, Alloc>:: basic_format(const string_type& s)
61 : style_(0), cur_arg_(0), num_args_(0), dumped_(false),
62 exceptions_(io::all_error_bits)
67 template< class Ch, class Tr, class Alloc> // just don't copy the buf_ member
68 basic_format<Ch, Tr, Alloc>:: basic_format(const basic_format& x)
69 : items_(x.items_), bound_(x.bound_), style_(x.style_),
70 cur_arg_(x.cur_arg_), num_args_(x.num_args_), dumped_(false),
71 prefix_(x.prefix_), exceptions_(x.exceptions_), loc_(x.loc_)
75 template< class Ch, class Tr, class Alloc> // just don't copy the buf_ member
76 basic_format<Ch, Tr, Alloc>& basic_format<Ch, Tr, Alloc>::
77 operator= (const basic_format& x) {
80 (basic_format<Ch, Tr, Alloc>(x)).swap(*this);
83 template< class Ch, class Tr, class Alloc>
84 void basic_format<Ch, Tr, Alloc>::
85 swap (basic_format & x) {
86 std::swap(exceptions_, x.exceptions_);
87 std::swap(style_, x.style_);
88 std::swap(cur_arg_, x.cur_arg_);
89 std::swap(num_args_, x.num_args_);
90 std::swap(dumped_, x.dumped_);
92 items_.swap(x.items_);
93 prefix_.swap(x.prefix_);
94 bound_.swap(x.bound_);
97 template< class Ch, class Tr, class Alloc>
98 unsigned char basic_format<Ch,Tr, Alloc>:: exceptions() const {
102 template< class Ch, class Tr, class Alloc>
103 unsigned char basic_format<Ch,Tr, Alloc>:: exceptions(unsigned char newexcept) {
104 unsigned char swp = exceptions_;
105 exceptions_ = newexcept;
109 template<class Ch, class Tr, class Alloc>
110 void basic_format<Ch, Tr, Alloc>::
111 make_or_reuse_data (std::size_t nbitems) {
112 #if !defined(BOOST_NO_STD_LOCALE)
113 Ch fill = ( BOOST_USE_FACET(std::ctype<Ch>, getloc()) ). widen(' ');
117 if(items_.size() == 0)
118 items_.assign( nbitems, format_item_t(fill) );
120 if(nbitems>items_.size())
121 items_.resize(nbitems, format_item_t(fill));
123 for(std::size_t i=0; i < nbitems; ++i)
124 items_[i].reset(fill); // strings are resized, instead of reallocated
128 template< class Ch, class Tr, class Alloc>
129 basic_format<Ch,Tr, Alloc>& basic_format<Ch,Tr, Alloc>::
131 // empty the string buffers (except bound arguments)
132 // and make the format object ready for formatting a new set of arguments
134 BOOST_ASSERT( bound_.size()==0 || num_args_ == static_cast<int>(bound_.size()) );
136 for(unsigned long i=0; i<items_.size(); ++i) {
137 // clear converted strings only if the corresponding argument is not bound :
138 if( bound_.size()==0 || items_[i].argN_<0 || !bound_[ items_[i].argN_ ] )
139 items_[i].res_.resize(0);
141 cur_arg_=0; dumped_=false;
142 // maybe first arg is bound:
143 if(bound_.size() != 0) {
144 for(; cur_arg_ < num_args_ && bound_[cur_arg_]; ++cur_arg_)
150 template< class Ch, class Tr, class Alloc>
151 basic_format<Ch,Tr, Alloc>& basic_format<Ch,Tr, Alloc>::
153 // remove all binds, then clear()
159 template< class Ch, class Tr, class Alloc>
160 basic_format<Ch,Tr, Alloc>& basic_format<Ch,Tr, Alloc>::
161 clear_bind (int argN) {
162 // remove the bind of ONE argument then clear()
163 if(argN<1 || argN > num_args_ || bound_.size()==0 || !bound_[argN-1] ) {
164 if( exceptions() & io::out_of_range_bit)
165 boost::throw_exception(io::out_of_range(argN, 1, num_args_+1 ) );
168 bound_[argN-1]=false;
173 template< class Ch, class Tr, class Alloc>
174 typename basic_format<Ch, Tr, Alloc>::string_type
175 basic_format<Ch,Tr, Alloc>::
179 if( cur_arg_ < num_args_)
180 if( exceptions() & io::too_few_args_bit )
181 // not enough variables supplied
182 boost::throw_exception(io::too_few_args(cur_arg_, num_args_));
188 for(i=0; i < items_.size(); ++i) {
189 const format_item_t& item = items_[i];
191 if( item.argN_ == format_item_t::argN_tabulation) {
192 BOOST_ASSERT( item.pad_scheme_ & format_item_t::tabulation);
193 if( static_cast<size_type>(item.fmtstate_.width_) > res.size() )
194 res.append( static_cast<size_type>(item.fmtstate_.width_) - res.size(),
195 item.fmtstate_.fill_ );
197 res += item.appendix_;
202 template< class Ch, class Tr, class Alloc>
203 typename std::basic_string<Ch, Tr, Alloc>::size_type basic_format<Ch,Tr, Alloc>::
205 BOOST_USING_STD_MAX();
206 size_type sz = prefix_.size();
208 for(i=0; i < items_.size(); ++i) {
209 const format_item_t& item = items_[i];
210 sz += item.res_.size();
211 if( item.argN_ == format_item_t::argN_tabulation)
212 sz = max BOOST_PREVENT_MACRO_SUBSTITUTION (sz,
213 static_cast<size_type>(item.fmtstate_.width_) );
214 sz += item.appendix_.size();
222 template<class Ch, class Tr, class Alloc, class T>
223 basic_format<Ch, Tr, Alloc>&
224 bind_arg_body (basic_format<Ch, Tr, Alloc>& self, int argN, const T& val) {
225 // bind one argument to a fixed value
226 // this is persistent over clear() calls, thus also over str() and <<
228 self.clear(); // needed because we will modify cur_arg_
229 if(argN<1 || argN > self.num_args_) {
230 if( self.exceptions() & io::out_of_range_bit )
231 boost::throw_exception(io::out_of_range(argN, 1, self.num_args_+1 ) );
234 if(self.bound_.size()==0)
235 self.bound_.assign(self.num_args_,false);
237 BOOST_ASSERT( self.num_args_ == static_cast<signed int>(self.bound_.size()) );
238 int o_cur_arg = self.cur_arg_;
239 self.cur_arg_ = argN-1; // arrays begin at 0
241 self.bound_[self.cur_arg_]=false; // if already set, we unset and re-sets..
242 self.operator%(val); // put val at the right place, because cur_arg is set
245 // Now re-position cur_arg before leaving :
246 self.cur_arg_ = o_cur_arg;
247 self.bound_[argN-1]=true;
248 if(self.cur_arg_ == argN-1 ) {
249 // hum, now this arg is bound, so move to next free arg
250 while(self.cur_arg_ < self.num_args_ && self.bound_[self.cur_arg_])
253 // In any case, we either have all args, or are on a non-binded arg :
254 BOOST_ASSERT( self.cur_arg_ >= self.num_args_ || ! self.bound_[self.cur_arg_]);
258 template<class Ch, class Tr, class Alloc, class T> basic_format<Ch, Tr, Alloc>&
259 modify_item_body (basic_format<Ch, Tr, Alloc>& self, int itemN, T manipulator) {
260 // applies a manipulator to the format_item describing a given directive.
261 // this is a permanent change, clear or reset won't cancel that.
262 if(itemN<1 || itemN > static_cast<signed int>(self.items_.size() )) {
263 if( self.exceptions() & io::out_of_range_bit )
264 boost::throw_exception(io::out_of_range(itemN, 1, self.items_.size() ));
267 self.items_[itemN-1].fmtstate_. template apply_manip<T> ( manipulator );
271 } // namespace detail
277 #endif // BOOST_FORMAT_IMPLEMENTATION_HPP