comparison DEPENDENCIES/generic/include/boost/format/feed_args.hpp @ 16:2665513ce2d3

Add boost headers

+// ----------------------------------------------------------------------------
+//  feed_args.hpp :  functions for processing each argument 
+//                      (feed, feed_manip, and distribute)
+// ----------------------------------------------------------------------------
+
+//  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_FEED_ARGS_HPP
+#define BOOST_FORMAT_FEED_ARGS_HPP
+
+#include <boost/config.hpp>
+#include <boost/assert.hpp>
+#include <boost/throw_exception.hpp>
+
+#include <boost/format/format_class.hpp>
+#include <boost/format/group.hpp>
+#include <boost/format/detail/msvc_disambiguater.hpp>
+
+namespace boost {
+namespace io {
+namespace detail {
+
+    template<class Ch, class Tr, class Alloc>
+    void mk_str( std::basic_string<Ch,Tr, Alloc> & res, 
+                 const Ch * beg,
+                 typename std::basic_string<Ch,Tr,Alloc>::size_type size,
+                 std::streamsize w, 
+                 const Ch fill_char,
+                 std::ios_base::fmtflags f, 
+                 const Ch prefix_space, // 0 if no space-padding
+                 bool center) 
+    // applies centered/left/right  padding  to the string  [beg, beg+size[
+    // Effects : the result is placed in res.
+    {
+        typedef typename std::basic_string<Ch,Tr,Alloc>::size_type size_type;
+        res.resize(0);
+        if(w<=0 || static_cast<size_type>(w) <=size) {
+            // no need to pad.
+            res.reserve(size + !!prefix_space);
+            if(prefix_space) 
+              res.append(1, prefix_space);
+            if (size)
+              res.append(beg, size);
+        }
+        else { 
+            std::streamsize n=static_cast<std::streamsize>(w-size-!!prefix_space);
+            std::streamsize n_after = 0, n_before = 0; 
+            res.reserve(static_cast<size_type>(w)); // allocate once for the 2 inserts
+            if(center) 
+                n_after = n/2, n_before = n - n_after; 
+            else 
+                if(f & std::ios_base::left)
+                    n_after = n;
+                else
+                    n_before = n;
+            // now make the res string :
+            if(n_before) res.append(static_cast<size_type>(n_before), fill_char);
+            if(prefix_space) 
+              res.append(1, prefix_space);
+            if (size)  
+              res.append(beg, size);
+            if(n_after) res.append(static_cast<size_type>(n_after), fill_char);
+        }
+    } // -mk_str(..) 
+
+
+#if BOOST_WORKAROUND( BOOST_MSVC, <= 1300) || \
+    BOOST_WORKAROUND(__DECCXX_VER, BOOST_TESTED_AT(60590042))
+// MSVC needs to be tricked to disambiguate this simple overload..
+// the trick is in "boost/format/msvc_disambiguater.hpp"
+  
+    template< class Ch, class Tr, class T> inline
+    void put_head (BOOST_IO_STD basic_ostream<Ch, Tr> & os, const T& x ) {
+        disambiguater<Ch, Tr, T>::put_head(os, x, 1L);
+    }
+    template< class Ch, class Tr, class T> inline
+    void put_last (BOOST_IO_STD basic_ostream<Ch, Tr> & os, const T& x ) {
+        disambiguater<Ch, Tr, T>::put_last(os, x, 1L);
+    }
+
+#else  
+
+    template< class Ch, class Tr, class T> inline
+    void put_head (BOOST_IO_STD basic_ostream<Ch, Tr> &, const T& ) {
+    }
+
+    template< class Ch, class Tr, class T> inline
+    void put_head( BOOST_IO_STD basic_ostream<Ch, Tr> & os, const group1<T>& x ) {
+        os << group_head(x.a1_); // send the first N-1 items, not the last
+    }
+
+    template< class Ch, class Tr, class T> inline
+    void put_last( BOOST_IO_STD basic_ostream<Ch, Tr> & os, const T& x ) {
+        os << x ;
+    }
+
+    template< class Ch, class Tr, class T> inline
+    void put_last( BOOST_IO_STD basic_ostream<Ch, Tr> & os, const group1<T>& x ) {
+        os << group_last(x.a1_); // this selects the last element
+    }
+
+#ifndef BOOST_NO_OVERLOAD_FOR_NON_CONST 
+    template< class Ch, class Tr, class T> inline
+    void put_head( BOOST_IO_STD basic_ostream<Ch, Tr> &, T& ) {
+    }
+
+    template< class Ch, class Tr, class T> inline
+    void put_last( BOOST_IO_STD basic_ostream<Ch, Tr> & os, T& x) {
+        os << x ;
+    }
+#endif
+#endif  // -msvc workaround
+
+
+    template< class Ch, class Tr, class Alloc, class T> 
+    void put( T x, 
+              const format_item<Ch, Tr, Alloc>& specs, 
+              typename basic_format<Ch, Tr, Alloc>::string_type& res, 
+              typename basic_format<Ch, Tr, Alloc>::internal_streambuf_t & buf,
+              io::detail::locale_t *loc_p = NULL)
+    {
+#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
+        // does the actual conversion of x, with given params, into a string
+        // using the supplied stringbuf.
+
+        typedef typename basic_format<Ch, Tr, Alloc>::string_type   string_type;
+        typedef typename basic_format<Ch, Tr, Alloc>::format_item_t format_item_t;
+        typedef typename string_type::size_type size_type;
+
+        basic_oaltstringstream<Ch, Tr, Alloc>  oss( &buf);
+        specs.fmtstate_.apply_on(oss, loc_p);
+
+        // the stream format state can be modified by manipulators in the argument :
+        put_head( oss, x );
+        // in case x is a group, apply the manip part of it, 
+        // in order to find width
+
+        const std::ios_base::fmtflags fl=oss.flags();
+        const bool internal = (fl & std::ios_base::internal) != 0;
+        const std::streamsize w = oss.width();
+        const bool two_stepped_padding= internal && (w!=0);
+      
+        res.resize(0);
+        if(! two_stepped_padding) {
+            if(w>0) // handle padding via mk_str, not natively in stream 
+                oss.width(0);
+            put_last( oss, x);
+            const Ch * res_beg = buf.pbase();
+            Ch prefix_space = 0;
+            if(specs.pad_scheme_ & format_item_t::spacepad)
+                if(buf.pcount()== 0 || 
+                   (res_beg[0] !=oss.widen('+') && res_beg[0] !=oss.widen('-')  ))
+                    prefix_space = oss.widen(' ');
+            size_type res_size = (std::min)(
+                static_cast<size_type>(specs.truncate_ - !!prefix_space), 
+                buf.pcount() );
+            mk_str(res, res_beg, res_size, w, oss.fill(), fl, 
+                   prefix_space, (specs.pad_scheme_ & format_item_t::centered) !=0 );
+        }
+        else  { // 2-stepped padding
+            // internal can be implied by zeropad, or user-set.
+            // left, right, and centered alignment overrule internal,
+            // but spacepad or truncate might be mixed with internal (using manipulator)
+            put_last( oss, x); // may pad
+            const Ch * res_beg = buf.pbase();
+            size_type res_size = buf.pcount();
+            bool prefix_space=false;
+            if(specs.pad_scheme_ & format_item_t::spacepad)
+                if(buf.pcount()== 0 || 
+                   (res_beg[0] !=oss.widen('+') && res_beg[0] !=oss.widen('-')  ))
+                    prefix_space = true;
+            if(res_size == static_cast<size_type>(w) && w<=specs.truncate_ && !prefix_space) {
+                // okay, only one thing was printed and padded, so res is fine
+                res.assign(res_beg, res_size);
+            }
+            else { //   length w exceeded
+                // either it was multi-output with first output padding up all width..
+                // either it was one big arg and we are fine.
+                // Note that res_size<w is possible  (in case of bad user-defined formatting)
+                res.assign(res_beg, res_size);
+                res_beg=NULL;  // invalidate pointers.
+                
+                // make a new stream, to start re-formatting from scratch :
+                buf.clear_buffer();
+                basic_oaltstringstream<Ch, Tr, Alloc>  oss2( &buf);
+                specs.fmtstate_.apply_on(oss2, loc_p);
+                put_head( oss2, x );
+
+                oss2.width(0);
+                if(prefix_space)
+                    oss2 << ' ';
+                put_last(oss2, x );
+                if(buf.pcount()==0 && specs.pad_scheme_ & format_item_t::spacepad) {
+                    prefix_space =true;
+                    oss2 << ' ';
+                }
+                // we now have the minimal-length output
+                const Ch * tmp_beg = buf.pbase();
+                size_type tmp_size = (std::min)(static_cast<size_type>(specs.truncate_),
+                                                buf.pcount() );
+                                                    
+                
+                if(static_cast<size_type>(w) <= tmp_size) { 
+                    // minimal length is already >= w, so no padding (cool!)
+                        res.assign(tmp_beg, tmp_size);
+                }
+                else { // hum..  we need to pad (multi_output, or spacepad present)
+                    //find where we should pad
+                    size_type sz = (std::min)(res_size + (prefix_space ? 1 : 0), tmp_size);
+                    size_type i = prefix_space;
+                    for(; i<sz && tmp_beg[i] == res[i - (prefix_space ? 1 : 0)]; ++i) {}
+                    if(i>=tmp_size) i=prefix_space;
+                    res.assign(tmp_beg, i);
+                                        std::streamsize d = w - static_cast<std::streamsize>(tmp_size);
+                                        BOOST_ASSERT(d>0);
+                    res.append(static_cast<size_type>( d ), oss2.fill());
+                    res.append(tmp_beg+i, tmp_size-i);
+                    BOOST_ASSERT(i+(tmp_size-i)+(std::max)(d,(std::streamsize)0) 
+                                 == static_cast<size_type>(w));
+                    BOOST_ASSERT(res.size() == static_cast<size_type>(w));
+                }
+            }
+        }
+        buf.clear_buffer();
+#ifdef BOOST_MSVC
+#pragma warning(pop)
+#endif
+    } // end- put(..)
+
+
+    template< class Ch, class Tr, class Alloc, class T> 
+    void distribute (basic_format<Ch,Tr, Alloc>& self, T x) {
+        // call put(x, ..) on every occurence of the current argument :
+        if(self.cur_arg_ >= self.num_args_)  {
+            if( self.exceptions() & too_many_args_bit )
+                boost::throw_exception(too_many_args(self.cur_arg_, self.num_args_)); 
+            else return;
+        }
+        for(unsigned long i=0; i < self.items_.size(); ++i) {
+            if(self.items_[i].argN_ == self.cur_arg_) {
+                put<Ch, Tr, Alloc, T> (x, self.items_[i], self.items_[i].res_, 
+                                self.buf_, boost::get_pointer(self.loc_) );
+            }
+        }
+    }
+
+    template<class Ch, class Tr, class Alloc, class T> 
+    basic_format<Ch, Tr, Alloc>&  
+    feed (basic_format<Ch,Tr, Alloc>& self, T x) {
+        if(self.dumped_) self.clear();
+        distribute<Ch, Tr, Alloc, T> (self, x);
+        ++self.cur_arg_;
+        if(self.bound_.size() != 0) {
+                while( self.cur_arg_ < self.num_args_ && self.bound_[self.cur_arg_] )
+                    ++self.cur_arg_;
+        }
+        return self;
+    }
+    
+} // namespace detail
+} // namespace io
+} // namespace boost
+
+
+#endif //  BOOST_FORMAT_FEED_ARGS_HPP