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1 | // ---------------------------------------------------------------------------- |
2 | // feed_args.hpp : functions for processing each argument | |
3 | // (feed, feed_manip, and distribute) | |
4 | // ---------------------------------------------------------------------------- | |
5 | ||
6 | // Copyright Samuel Krempp 2003. Use, modification, and distribution are | |
7 | // subject to the Boost Software License, Version 1.0. (See accompanying | |
8 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
9 | ||
10 | // See http://www.boost.org/libs/format for library home page | |
11 | ||
12 | // ---------------------------------------------------------------------------- | |
13 | ||
14 | #ifndef BOOST_FORMAT_FEED_ARGS_HPP | |
15 | #define BOOST_FORMAT_FEED_ARGS_HPP | |
16 | ||
17 | #include <boost/config.hpp> | |
18 | #include <boost/assert.hpp> | |
19 | #include <boost/throw_exception.hpp> | |
20 | ||
21 | #include <boost/format/format_class.hpp> | |
22 | #include <boost/format/group.hpp> | |
23 | #include <boost/format/detail/msvc_disambiguater.hpp> | |
24 | ||
25 | namespace boost { | |
26 | namespace io { | |
27 | namespace detail { | |
28 | ||
29 | template<class Ch, class Tr, class Alloc> | |
30 | void mk_str( std::basic_string<Ch,Tr, Alloc> & res, | |
31 | const Ch * beg, | |
32 | typename std::basic_string<Ch,Tr,Alloc>::size_type size, | |
33 | std::streamsize w, | |
34 | const Ch fill_char, | |
35 | std::ios_base::fmtflags f, | |
36 | const Ch prefix_space, // 0 if no space-padding | |
37 | bool center) | |
38 | // applies centered/left/right padding to the string [beg, beg+size[ | |
39 | // Effects : the result is placed in res. | |
40 | { | |
41 | typedef typename std::basic_string<Ch,Tr,Alloc>::size_type size_type; | |
42 | res.resize(0); | |
43 | if(w<=0 || static_cast<size_type>(w) <=size) { | |
44 | // no need to pad. | |
45 | res.reserve(size + !!prefix_space); | |
46 | if(prefix_space) | |
47 | res.append(1, prefix_space); | |
48 | if (size) | |
49 | res.append(beg, size); | |
50 | } | |
51 | else { | |
52 | std::streamsize n=static_cast<std::streamsize>(w-size-!!prefix_space); | |
53 | std::streamsize n_after = 0, n_before = 0; | |
54 | res.reserve(static_cast<size_type>(w)); // allocate once for the 2 inserts | |
55 | if(center) | |
56 | n_after = n/2, n_before = n - n_after; | |
57 | else | |
58 | if(f & std::ios_base::left) | |
59 | n_after = n; | |
60 | else | |
61 | n_before = n; | |
62 | // now make the res string : | |
63 | if(n_before) res.append(static_cast<size_type>(n_before), fill_char); | |
64 | if(prefix_space) | |
65 | res.append(1, prefix_space); | |
66 | if (size) | |
67 | res.append(beg, size); | |
68 | if(n_after) res.append(static_cast<size_type>(n_after), fill_char); | |
69 | } | |
70 | } // -mk_str(..) | |
71 | ||
72 | ||
73 | #if BOOST_WORKAROUND(__DECCXX_VER, BOOST_TESTED_AT(60590042)) | |
74 | // __DECCXX needs to be tricked to disambiguate this simple overload.. | |
75 | // the trick is in "boost/format/msvc_disambiguater.hpp" | |
76 | ||
77 | template< class Ch, class Tr, class T> inline | |
78 | void put_head (BOOST_IO_STD basic_ostream<Ch, Tr> & os, const T& x ) { | |
79 | disambiguater<Ch, Tr, T>::put_head(os, x, 1L); | |
80 | } | |
81 | template< class Ch, class Tr, class T> inline | |
82 | void put_last (BOOST_IO_STD basic_ostream<Ch, Tr> & os, const T& x ) { | |
83 | disambiguater<Ch, Tr, T>::put_last(os, x, 1L); | |
84 | } | |
85 | ||
86 | #else | |
87 | ||
88 | template< class Ch, class Tr, class T> inline | |
89 | void put_head (BOOST_IO_STD basic_ostream<Ch, Tr> &, const T& ) { | |
90 | } | |
91 | ||
92 | template< class Ch, class Tr, class T> inline | |
93 | void put_head( BOOST_IO_STD basic_ostream<Ch, Tr> & os, const group1<T>& x ) { | |
94 | os << group_head(x.a1_); // send the first N-1 items, not the last | |
95 | } | |
96 | ||
97 | template< class Ch, class Tr, class T> inline | |
98 | void put_last( BOOST_IO_STD basic_ostream<Ch, Tr> & os, const T& x ) { | |
99 | os << x ; | |
100 | } | |
101 | ||
102 | template< class Ch, class Tr, class T> inline | |
103 | void put_last( BOOST_IO_STD basic_ostream<Ch, Tr> & os, const group1<T>& x ) { | |
104 | os << group_last(x.a1_); // this selects the last element | |
105 | } | |
106 | ||
107 | #ifndef BOOST_NO_OVERLOAD_FOR_NON_CONST | |
108 | template< class Ch, class Tr, class T> inline | |
109 | void put_head( BOOST_IO_STD basic_ostream<Ch, Tr> &, T& ) { | |
110 | } | |
111 | ||
112 | template< class Ch, class Tr, class T> inline | |
113 | void put_last( BOOST_IO_STD basic_ostream<Ch, Tr> & os, T& x) { | |
114 | os << x ; | |
115 | } | |
116 | #endif | |
117 | #endif // -__DECCXX workaround | |
118 | ||
119 | template< class Ch, class Tr, class T> | |
120 | void call_put_head(BOOST_IO_STD basic_ostream<Ch, Tr> & os, const void* x) { | |
121 | put_head(os, *(typename ::boost::remove_reference<T>::type*)x); | |
122 | } | |
123 | ||
124 | template< class Ch, class Tr, class T> | |
125 | void call_put_last(BOOST_IO_STD basic_ostream<Ch, Tr> & os, const void* x) { | |
126 | put_last(os, *(T*)x); | |
127 | } | |
128 | ||
129 | template< class Ch, class Tr> | |
130 | struct put_holder { | |
131 | template<class T> | |
132 | put_holder(T& t) | |
133 | : arg(&t), | |
134 | put_head(&call_put_head<Ch, Tr, T>), | |
135 | put_last(&call_put_last<Ch, Tr, T>) | |
136 | {} | |
137 | const void* arg; | |
138 | void (*put_head)(BOOST_IO_STD basic_ostream<Ch, Tr> & os, const void* x); | |
139 | void (*put_last)(BOOST_IO_STD basic_ostream<Ch, Tr> & os, const void* x); | |
140 | }; | |
141 | ||
142 | template< class Ch, class Tr> inline | |
143 | void put_head( BOOST_IO_STD basic_ostream<Ch, Tr> & os, const put_holder<Ch, Tr>& t) { | |
144 | t.put_head(os, t.arg); | |
145 | } | |
146 | ||
147 | template< class Ch, class Tr> inline | |
148 | void put_last( BOOST_IO_STD basic_ostream<Ch, Tr> & os, const put_holder<Ch, Tr>& t) { | |
149 | t.put_last(os, t.arg); | |
150 | } | |
151 | ||
152 | ||
153 | template< class Ch, class Tr, class Alloc, class T> | |
154 | void put( T x, | |
155 | const format_item<Ch, Tr, Alloc>& specs, | |
156 | typename basic_format<Ch, Tr, Alloc>::string_type& res, | |
157 | typename basic_format<Ch, Tr, Alloc>::internal_streambuf_t & buf, | |
158 | io::detail::locale_t *loc_p = NULL) | |
159 | { | |
160 | #ifdef BOOST_MSVC | |
161 | // If std::min<unsigned> or std::max<unsigned> are already instantiated | |
162 | // at this point then we get a blizzard of warning messages when we call | |
163 | // those templates with std::size_t as arguments. Weird and very annoyning... | |
164 | #pragma warning(push) | |
165 | #pragma warning(disable:4267) | |
166 | #endif | |
167 | // does the actual conversion of x, with given params, into a string | |
168 | // using the supplied stringbuf. | |
169 | ||
170 | typedef typename basic_format<Ch, Tr, Alloc>::string_type string_type; | |
171 | typedef typename basic_format<Ch, Tr, Alloc>::format_item_t format_item_t; | |
172 | typedef typename string_type::size_type size_type; | |
173 | ||
174 | basic_oaltstringstream<Ch, Tr, Alloc> oss( &buf); | |
175 | ||
176 | if(loc_p != NULL) | |
177 | oss.imbue(*loc_p); | |
178 | ||
179 | specs.fmtstate_.apply_on(oss, loc_p); | |
180 | ||
181 | // the stream format state can be modified by manipulators in the argument : | |
182 | put_head( oss, x ); | |
183 | // in case x is a group, apply the manip part of it, | |
184 | // in order to find width | |
185 | ||
186 | const std::ios_base::fmtflags fl=oss.flags(); | |
187 | const bool internal = (fl & std::ios_base::internal) != 0; | |
188 | const std::streamsize w = oss.width(); | |
189 | const bool two_stepped_padding= internal && (w!=0); | |
190 | ||
191 | res.resize(0); | |
192 | if(! two_stepped_padding) { | |
193 | if(w>0) // handle padding via mk_str, not natively in stream | |
194 | oss.width(0); | |
195 | put_last( oss, x); | |
196 | const Ch * res_beg = buf.pbase(); | |
197 | Ch prefix_space = 0; | |
198 | if(specs.pad_scheme_ & format_item_t::spacepad) | |
199 | if(buf.pcount()== 0 || | |
200 | (res_beg[0] !=oss.widen('+') && res_beg[0] !=oss.widen('-') )) | |
201 | prefix_space = oss.widen(' '); | |
202 | size_type res_size = (std::min)( | |
203 | static_cast<size_type>(specs.truncate_ - !!prefix_space), | |
204 | buf.pcount() ); | |
205 | mk_str(res, res_beg, res_size, w, oss.fill(), fl, | |
206 | prefix_space, (specs.pad_scheme_ & format_item_t::centered) !=0 ); | |
207 | } | |
208 | else { // 2-stepped padding | |
209 | // internal can be implied by zeropad, or user-set. | |
210 | // left, right, and centered alignment overrule internal, | |
211 | // but spacepad or truncate might be mixed with internal (using manipulator) | |
212 | put_last( oss, x); // may pad | |
213 | const Ch * res_beg = buf.pbase(); | |
214 | size_type res_size = buf.pcount(); | |
215 | bool prefix_space=false; | |
216 | if(specs.pad_scheme_ & format_item_t::spacepad) | |
217 | if(buf.pcount()== 0 || | |
218 | (res_beg[0] !=oss.widen('+') && res_beg[0] !=oss.widen('-') )) | |
219 | prefix_space = true; | |
220 | if(res_size == static_cast<size_type>(w) && w<=specs.truncate_ && !prefix_space) { | |
221 | // okay, only one thing was printed and padded, so res is fine | |
222 | res.assign(res_beg, res_size); | |
223 | } | |
224 | else { // length w exceeded | |
225 | // either it was multi-output with first output padding up all width.. | |
226 | // either it was one big arg and we are fine. | |
227 | // Note that res_size<w is possible (in case of bad user-defined formatting) | |
228 | res.assign(res_beg, res_size); | |
229 | res_beg=NULL; // invalidate pointers. | |
230 | ||
231 | // make a new stream, to start re-formatting from scratch : | |
232 | buf.clear_buffer(); | |
233 | basic_oaltstringstream<Ch, Tr, Alloc> oss2( &buf); | |
234 | specs.fmtstate_.apply_on(oss2, loc_p); | |
235 | put_head( oss2, x ); | |
236 | ||
237 | oss2.width(0); | |
238 | if(prefix_space) | |
239 | oss2 << ' '; | |
240 | put_last(oss2, x ); | |
241 | if(buf.pcount()==0 && specs.pad_scheme_ & format_item_t::spacepad) { | |
242 | prefix_space =true; | |
243 | oss2 << ' '; | |
244 | } | |
245 | // we now have the minimal-length output | |
246 | const Ch * tmp_beg = buf.pbase(); | |
247 | size_type tmp_size = (std::min)(static_cast<size_type>(specs.truncate_), | |
248 | buf.pcount() ); | |
249 | ||
250 | ||
251 | if(static_cast<size_type>(w) <= tmp_size) { | |
252 | // minimal length is already >= w, so no padding (cool!) | |
253 | res.assign(tmp_beg, tmp_size); | |
254 | } | |
255 | else { // hum.. we need to pad (multi_output, or spacepad present) | |
256 | //find where we should pad | |
257 | size_type sz = (std::min)(res_size + (prefix_space ? 1 : 0), tmp_size); | |
258 | size_type i = prefix_space; | |
259 | for(; i<sz && tmp_beg[i] == res[i - (prefix_space ? 1 : 0)]; ++i) {} | |
260 | if(i>=tmp_size) i=prefix_space; | |
261 | res.assign(tmp_beg, i); | |
262 | std::streamsize d = w - static_cast<std::streamsize>(tmp_size); | |
263 | BOOST_ASSERT(d>0); | |
264 | res.append(static_cast<size_type>( d ), oss2.fill()); | |
265 | res.append(tmp_beg+i, tmp_size-i); | |
266 | BOOST_ASSERT(i+(tmp_size-i)+(std::max)(d,(std::streamsize)0) | |
267 | == static_cast<size_type>(w)); | |
268 | BOOST_ASSERT(res.size() == static_cast<size_type>(w)); | |
269 | } | |
270 | } | |
271 | } | |
272 | buf.clear_buffer(); | |
273 | #ifdef BOOST_MSVC | |
274 | #pragma warning(pop) | |
275 | #endif | |
276 | } // end- put(..) | |
277 | ||
278 | ||
279 | template< class Ch, class Tr, class Alloc, class T> | |
280 | void distribute (basic_format<Ch,Tr, Alloc>& self, T x) { | |
281 | // call put(x, ..) on every occurrence of the current argument : | |
282 | if(self.cur_arg_ >= self.num_args_) { | |
283 | if( self.exceptions() & too_many_args_bit ) | |
284 | boost::throw_exception(too_many_args(self.cur_arg_, self.num_args_)); | |
285 | else return; | |
286 | } | |
287 | for(unsigned long i=0; i < self.items_.size(); ++i) { | |
288 | if(self.items_[i].argN_ == self.cur_arg_) { | |
289 | put<Ch, Tr, Alloc, T> (x, self.items_[i], self.items_[i].res_, | |
290 | self.buf_, boost::get_pointer(self.loc_) ); | |
291 | } | |
292 | } | |
293 | } | |
294 | ||
295 | template<class Ch, class Tr, class Alloc, class T> | |
296 | basic_format<Ch, Tr, Alloc>& | |
297 | feed_impl (basic_format<Ch,Tr, Alloc>& self, T x) { | |
298 | if(self.dumped_) self.clear(); | |
299 | distribute<Ch, Tr, Alloc, T> (self, x); | |
300 | ++self.cur_arg_; | |
301 | if(self.bound_.size() != 0) { | |
302 | while( self.cur_arg_ < self.num_args_ && self.bound_[self.cur_arg_] ) | |
303 | ++self.cur_arg_; | |
304 | } | |
305 | return self; | |
306 | } | |
307 | ||
308 | template<class Ch, class Tr, class Alloc, class T> inline | |
309 | basic_format<Ch, Tr, Alloc>& | |
310 | feed (basic_format<Ch,Tr, Alloc>& self, T x) { | |
311 | return feed_impl<Ch, Tr, Alloc, const put_holder<Ch, Tr>&>(self, put_holder<Ch, Tr>(x)); | |
312 | } | |
313 | ||
314 | } // namespace detail | |
315 | } // namespace io | |
316 | } // namespace boost | |
317 | ||
318 | ||
319 | #endif // BOOST_FORMAT_FEED_ARGS_HPP |