[857] | 1 | // ----------------------------------------------------------------------------
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| 2 | // feed_args.hpp : functions for processing each argument
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| 3 | // (feed, feed_manip, and distribute)
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| 4 | // ----------------------------------------------------------------------------
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| 5 |
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| 6 | // Copyright Samuel Krempp 2003. Use, modification, and distribution are
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| 7 | // subject to the Boost Software License, Version 1.0. (See accompanying
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| 8 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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| 9 |
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| 10 | // See http://www.boost.org/libs/format for library home page
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| 11 |
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| 12 | // ----------------------------------------------------------------------------
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| 13 |
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| 14 | #ifndef BOOST_FORMAT_FEED_ARGS_HPP
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| 15 | #define BOOST_FORMAT_FEED_ARGS_HPP
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| 16 |
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| 17 | #include <boost/config.hpp>
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| 18 | #include <boost/assert.hpp>
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| 19 | #include <boost/throw_exception.hpp>
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| 20 |
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| 21 | #include <boost/format/format_class.hpp>
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| 22 | #include <boost/format/group.hpp>
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| 23 | #include <boost/format/detail/msvc_disambiguater.hpp>
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| 24 |
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| 25 | namespace boost {
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| 26 | namespace io {
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| 27 | namespace detail {
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| 28 |
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| 29 | template<class Ch, class Tr, class Alloc>
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| 30 | void mk_str( std::basic_string<Ch,Tr, Alloc> & res,
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| 31 | const Ch * beg,
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| 32 | typename std::basic_string<Ch,Tr,Alloc>::size_type size,
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| 33 | std::streamsize w,
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| 34 | const Ch fill_char,
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| 35 | std::ios_base::fmtflags f,
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| 36 | const Ch prefix_space, // 0 if no space-padding
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| 37 | bool center)
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| 38 | // applies centered/left/right padding to the string [beg, beg+size[
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| 39 | // Effects : the result is placed in res.
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| 40 | {
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| 41 | typedef typename std::basic_string<Ch,Tr,Alloc>::size_type size_type;
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| 42 | res.resize(0);
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| 43 | if(w<=0 || static_cast<size_type>(w) <=size) {
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| 44 | // no need to pad.
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| 45 | res.reserve(size + !!prefix_space);
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| 46 | if(prefix_space)
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| 47 | res.append(1, prefix_space);
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| 48 | res.append(beg, size);
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| 49 | }
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| 50 | else {
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| 51 | std::streamsize n=static_cast<std::streamsize>(w-size-!!prefix_space);
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| 52 | std::streamsize n_after = 0, n_before = 0;
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| 53 | res.reserve(w); // allocate once for the 2 inserts
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| 54 | if(center)
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| 55 | n_after = n/2, n_before = n - n_after;
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| 56 | else
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| 57 | if(f & std::ios_base::left)
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| 58 | n_after = n;
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| 59 | else
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| 60 | n_before = n;
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| 61 | // now make the res string :
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| 62 | if(n_before) res.append(n_before, fill_char);
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| 63 | if(prefix_space)
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| 64 | res.append(1, prefix_space);
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| 65 | res.append(beg, size);
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| 66 | if(n_after) res.append(n_after, fill_char);
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| 67 | }
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| 68 | } // -mk_str(..)
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| 69 |
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| 70 |
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| 71 | #if BOOST_WORKAROUND( BOOST_MSVC, <= 1300) || \
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| 72 | BOOST_WORKAROUND(__DECCXX_VER, BOOST_TESTED_AT(60590042))
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| 73 | // MSVC needs to be tricked to disambiguate this simple overload..
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| 74 | // the trick is in "boost/format/msvc_disambiguater.hpp"
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| 75 |
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| 76 | template< class Ch, class Tr, class T> inline
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| 77 | void put_head (BOOST_IO_STD basic_ostream<Ch, Tr> & os, const T& x ) {
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| 78 | disambiguater<Ch, Tr, T>::put_head(os, x, 1L);
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| 79 | }
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| 80 | template< class Ch, class Tr, class T> inline
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| 81 | void put_last (BOOST_IO_STD basic_ostream<Ch, Tr> & os, const T& x ) {
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| 82 | disambiguater<Ch, Tr, T>::put_last(os, x, 1L);
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| 83 | }
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| 84 |
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| 85 | #else
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| 86 |
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| 87 | template< class Ch, class Tr, class T> inline
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| 88 | void put_head (BOOST_IO_STD basic_ostream<Ch, Tr> &, const T& ) {
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| 89 | }
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| 90 |
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| 91 | template< class Ch, class Tr, class T> inline
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| 92 | void put_head( BOOST_IO_STD basic_ostream<Ch, Tr> & os, const group1<T>& x ) {
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| 93 | os << group_head(x.a1_); // send the first N-1 items, not the last
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| 94 | }
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| 95 |
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| 96 | template< class Ch, class Tr, class T> inline
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| 97 | void put_last( BOOST_IO_STD basic_ostream<Ch, Tr> & os, const T& x ) {
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| 98 | os << x ;
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| 99 | }
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| 100 |
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| 101 | template< class Ch, class Tr, class T> inline
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| 102 | void put_last( BOOST_IO_STD basic_ostream<Ch, Tr> & os, const group1<T>& x ) {
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| 103 | os << group_last(x.a1_); // this selects the last element
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| 104 | }
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| 105 |
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| 106 | #ifndef BOOST_NO_OVERLOAD_FOR_NON_CONST
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| 107 | template< class Ch, class Tr, class T> inline
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| 108 | void put_head( BOOST_IO_STD basic_ostream<Ch, Tr> &, T& ) {
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| 109 | }
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| 110 |
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| 111 | template< class Ch, class Tr, class T> inline
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| 112 | void put_last( BOOST_IO_STD basic_ostream<Ch, Tr> & os, T& x) {
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| 113 | os << x ;
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| 114 | }
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| 115 | #endif
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| 116 | #endif // -msvc workaround
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| 117 |
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| 118 |
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| 119 | template< class Ch, class Tr, class Alloc, class T>
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| 120 | void put( T x,
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| 121 | const format_item<Ch, Tr, Alloc>& specs,
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| 122 | typename basic_format<Ch, Tr, Alloc>::string_type& res,
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| 123 | typename basic_format<Ch, Tr, Alloc>::internal_streambuf_t & buf,
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| 124 | io::detail::locale_t *loc_p = NULL)
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| 125 | {
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| 126 | // does the actual conversion of x, with given params, into a string
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| 127 | // using the supplied stringbuf.
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| 128 |
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| 129 | typedef typename basic_format<Ch, Tr, Alloc>::string_type string_type;
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| 130 | typedef typename basic_format<Ch, Tr, Alloc>::format_item_t format_item_t;
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| 131 | typedef typename string_type::size_type size_type;
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| 132 |
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| 133 | basic_oaltstringstream<Ch, Tr, Alloc> oss( &buf);
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| 134 | specs.fmtstate_.apply_on(oss, loc_p);
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| 135 |
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| 136 | // the stream format state can be modified by manipulators in the argument :
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| 137 | put_head( oss, x );
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| 138 | // in case x is a group, apply the manip part of it,
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| 139 | // in order to find width
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| 140 |
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| 141 | const std::ios_base::fmtflags fl=oss.flags();
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| 142 | const bool internal = (fl & std::ios_base::internal) != 0;
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| 143 | const std::streamsize w = oss.width();
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| 144 | const bool two_stepped_padding= internal && (w!=0);
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| 145 |
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| 146 | res.resize(0);
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| 147 | if(! two_stepped_padding) {
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| 148 | if(w>0) // handle padding via mk_str, not natively in stream
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| 149 | oss.width(0);
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| 150 | put_last( oss, x);
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| 151 | const Ch * res_beg = buf.pbase();
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| 152 | Ch prefix_space = 0;
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| 153 | if(specs.pad_scheme_ & format_item_t::spacepad)
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| 154 | if(buf.pcount()== 0 ||
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| 155 | (res_beg[0] !=oss.widen('+') && res_beg[0] !=oss.widen('-') ))
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| 156 | prefix_space = oss.widen(' ');
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| 157 | size_type res_size = (std::min)(
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| 158 | static_cast<size_type>(specs.truncate_ - !!prefix_space),
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| 159 | buf.pcount() );
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| 160 | mk_str(res, res_beg, res_size, w, oss.fill(), fl,
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| 161 | prefix_space, (specs.pad_scheme_ & format_item_t::centered) !=0 );
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| 162 | }
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| 163 | else { // 2-stepped padding
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| 164 | // internal can be implied by zeropad, or user-set.
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| 165 | // left, right, and centered alignment overrule internal,
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| 166 | // but spacepad or truncate might be mixed with internal (using manipulator)
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| 167 | put_last( oss, x); // may pad
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| 168 | const Ch * res_beg = buf.pbase();
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| 169 | size_type res_size = buf.pcount();
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| 170 | bool prefix_space=false;
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| 171 | if(specs.pad_scheme_ & format_item_t::spacepad)
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| 172 | if(buf.pcount()== 0 ||
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| 173 | (res_beg[0] !=oss.widen('+') && res_beg[0] !=oss.widen('-') ))
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| 174 | prefix_space = true;
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| 175 | if(res_size == static_cast<size_type>(w) && w<=specs.truncate_ && !prefix_space) {
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| 176 | // okay, only one thing was printed and padded, so res is fine
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| 177 | res.assign(res_beg, res_size);
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| 178 | }
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| 179 | else { // length w exceeded
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| 180 | // either it was multi-output with first output padding up all width..
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| 181 | // either it was one big arg and we are fine.
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| 182 | // Note that res_size<w is possible (in case of bad user-defined formatting)
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| 183 | res.assign(res_beg, res_size);
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| 184 | res_beg=NULL; // invalidate pointers.
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| 185 |
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| 186 | // make a new stream, to start re-formatting from scratch :
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| 187 | buf.clear_buffer();
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| 188 | basic_oaltstringstream<Ch, Tr, Alloc> oss2( &buf);
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| 189 | specs.fmtstate_.apply_on(oss2, loc_p);
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| 190 | put_head( oss2, x );
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| 191 |
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| 192 | oss2.width(0);
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| 193 | if(prefix_space)
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| 194 | oss2 << ' ';
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| 195 | put_last(oss2, x );
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| 196 | if(buf.pcount()==0 && specs.pad_scheme_ & format_item_t::spacepad) {
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| 197 | prefix_space =true;
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| 198 | oss2 << ' ';
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| 199 | }
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| 200 | // we now have the minimal-length output
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| 201 | const Ch * tmp_beg = buf.pbase();
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| 202 | size_type tmp_size = (std::min)(static_cast<size_type>(specs.truncate_),
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| 203 | buf.pcount() );
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| 204 |
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| 205 |
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| 206 | if(static_cast<size_type>(w) <= tmp_size) {
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| 207 | // minimal length is already >= w, so no padding (cool!)
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| 208 | res.assign(tmp_beg, tmp_size);
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| 209 | }
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| 210 | else { // hum.. we need to pad (multi_output, or spacepad present)
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| 211 | //find where we should pad
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| 212 | size_type sz = (std::min)(res_size+prefix_space, tmp_size);
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| 213 | size_type i = prefix_space;
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| 214 | for(; i<sz && tmp_beg[i] == res[i-prefix_space]; ++i) {}
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| 215 | if(i>=tmp_size) i=prefix_space;
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| 216 | res.assign(tmp_beg, i);
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| 217 | std::streamsize d = w - static_cast<std::streamsize>(tmp_size);
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| 218 | BOOST_ASSERT(d>0);
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| 219 | res.append(static_cast<size_type>( d ), oss2.fill());
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| 220 | res.append(tmp_beg+i, tmp_size-i);
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| 221 | BOOST_ASSERT(i+(tmp_size-i)+(std::max)(d,(std::streamsize)0)
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| 222 | == static_cast<size_type>(w));
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| 223 | BOOST_ASSERT(res.size() == static_cast<size_type>(w));
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| 224 | }
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| 225 | }
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| 226 | }
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| 227 | buf.clear_buffer();
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| 228 | } // end- put(..)
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| 229 |
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| 230 |
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| 231 | template< class Ch, class Tr, class Alloc, class T>
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| 232 | void distribute (basic_format<Ch,Tr, Alloc>& self, T x) {
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| 233 | // call put(x, ..) on every occurence of the current argument :
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| 234 | if(self.cur_arg_ >= self.num_args_) {
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| 235 | if( self.exceptions() & too_many_args_bit )
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| 236 | boost::throw_exception(too_many_args(self.cur_arg_, self.num_args_));
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| 237 | else return;
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| 238 | }
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| 239 | for(unsigned long i=0; i < self.items_.size(); ++i) {
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| 240 | if(self.items_[i].argN_ == self.cur_arg_) {
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| 241 | put<Ch, Tr, Alloc, T> (x, self.items_[i], self.items_[i].res_,
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| 242 | self.buf_, boost::get_pointer(self.loc_) );
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| 243 | }
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| 244 | }
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| 245 | }
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| 246 |
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| 247 | template<class Ch, class Tr, class Alloc, class T>
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| 248 | basic_format<Ch, Tr, Alloc>&
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| 249 | feed (basic_format<Ch,Tr, Alloc>& self, T x) {
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| 250 | if(self.dumped_) self.clear();
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| 251 | distribute<Ch, Tr, Alloc, T> (self, x);
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| 252 | ++self.cur_arg_;
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| 253 | if(self.bound_.size() != 0) {
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| 254 | while( self.cur_arg_ < self.num_args_ && self.bound_[self.cur_arg_] )
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| 255 | ++self.cur_arg_;
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| 256 | }
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| 257 | return self;
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| 258 | }
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| 259 |
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| 260 | } // namespace detail
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| 261 | } // namespace io
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| 262 | } // namespace boost
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| 263 |
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| 264 |
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| 265 | #endif // BOOST_FORMAT_FEED_ARGS_HPP
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