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