1 // SGI's rope class implementation -*- C++ -*-
2
3 // Copyright (C) 2001-2022 Free Software Foundation, Inc.
4 //
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 3, or (at your option)
9 // any later version.
10
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
15
16 // Under Section 7 of GPL version 3, you are granted additional
17 // permissions described in the GCC Runtime Library Exception, version
18 // 3.1, as published by the Free Software Foundation.
19
20 // You should have received a copy of the GNU General Public License and
21 // a copy of the GCC Runtime Library Exception along with this program;
22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 // <http://www.gnu.org/licenses/>.
24
25 /*
26 * Copyright (c) 1997
27 * Silicon Graphics Computer Systems, Inc.
28 *
29 * Permission to use, copy, modify, distribute and sell this software
30 * and its documentation for any purpose is hereby granted without fee,
31 * provided that the above copyright notice appear in all copies and
32 * that both that copyright notice and this permission notice appear
33 * in supporting documentation. Silicon Graphics makes no
34 * representations about the suitability of this software for any
35 * purpose. It is provided "as is" without express or implied warranty.
36 */
37
38 /** @file ropeimpl.h
39 * This is an internal header file, included by other library headers.
40 * Do not attempt to use it directly. @headername{ext/rope}
41 */
42
43 #include <cstdio>
44 #include <ostream>
45 #include <bits/functexcept.h>
46
47 #include <ext/algorithm> // For copy_n and lexicographical_compare_3way
48 #include <ext/memory> // For uninitialized_copy_n
49 #include <ext/numeric> // For power
50
_GLIBCXX_VISIBILITY(default)51 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
52 {
53 _GLIBCXX_BEGIN_NAMESPACE_VERSION
54
55 // Set buf_start, buf_end, and buf_ptr appropriately, filling tmp_buf
56 // if necessary. Assumes _M_path_end[leaf_index] and leaf_pos are correct.
57 // Results in a valid buf_ptr if the iterator can be legitimately
58 // dereferenced.
59 template <class _CharT, class _Alloc>
60 void
61 _Rope_iterator_base<_CharT, _Alloc>::
62 _S_setbuf(_Rope_iterator_base<_CharT, _Alloc>& __x)
63 {
64 using std::size_t;
65 const _RopeRep* __leaf = __x._M_path_end[__x._M_leaf_index];
66 size_t __leaf_pos = __x._M_leaf_pos;
67 size_t __pos = __x._M_current_pos;
68
69 switch(__leaf->_M_tag)
70 {
71 case __detail::_S_leaf:
72 __x._M_buf_start = ((_Rope_RopeLeaf<_CharT, _Alloc>*)__leaf)->_M_data;
73 __x._M_buf_ptr = __x._M_buf_start + (__pos - __leaf_pos);
74 __x._M_buf_end = __x._M_buf_start + __leaf->_M_size;
75 break;
76 case __detail::_S_function:
77 case __detail::_S_substringfn:
78 {
79 size_t __len = _S_iterator_buf_len;
80 size_t __buf_start_pos = __leaf_pos;
81 size_t __leaf_end = __leaf_pos + __leaf->_M_size;
82 char_producer<_CharT>* __fn = ((_Rope_RopeFunction<_CharT,
83 _Alloc>*)__leaf)->_M_fn;
84 if (__buf_start_pos + __len <= __pos)
85 {
86 __buf_start_pos = __pos - __len / 4;
87 if (__buf_start_pos + __len > __leaf_end)
88 __buf_start_pos = __leaf_end - __len;
89 }
90 if (__buf_start_pos + __len > __leaf_end)
91 __len = __leaf_end - __buf_start_pos;
92 (*__fn)(__buf_start_pos - __leaf_pos, __len, __x._M_tmp_buf);
93 __x._M_buf_ptr = __x._M_tmp_buf + (__pos - __buf_start_pos);
94 __x._M_buf_start = __x._M_tmp_buf;
95 __x._M_buf_end = __x._M_tmp_buf + __len;
96 }
97 break;
98 default:
99 break;
100 }
101 }
102
103 // Set path and buffer inside a rope iterator. We assume that
104 // pos and root are already set.
105 template <class _CharT, class _Alloc>
106 void
107 _Rope_iterator_base<_CharT, _Alloc>::
108 _S_setcache(_Rope_iterator_base<_CharT, _Alloc>& __x)
109 {
110 using std::size_t;
111 const _RopeRep* __path[int(__detail::_S_max_rope_depth) + 1];
112 const _RopeRep* __curr_rope;
113 int __curr_depth = -1; /* index into path */
114 size_t __curr_start_pos = 0;
115 size_t __pos = __x._M_current_pos;
116 unsigned char __dirns = 0; // Bit vector marking right turns in the path
117
118 if (__pos >= __x._M_root->_M_size)
119 {
120 __x._M_buf_ptr = 0;
121 return;
122 }
123 __curr_rope = __x._M_root;
124 if (0 != __curr_rope->_M_c_string)
125 {
126 /* Treat the root as a leaf. */
127 __x._M_buf_start = __curr_rope->_M_c_string;
128 __x._M_buf_end = __curr_rope->_M_c_string + __curr_rope->_M_size;
129 __x._M_buf_ptr = __curr_rope->_M_c_string + __pos;
130 __x._M_path_end[0] = __curr_rope;
131 __x._M_leaf_index = 0;
132 __x._M_leaf_pos = 0;
133 return;
134 }
135 for(;;)
136 {
137 ++__curr_depth;
138 __path[__curr_depth] = __curr_rope;
139 switch(__curr_rope->_M_tag)
140 {
141 case __detail::_S_leaf:
142 case __detail::_S_function:
143 case __detail::_S_substringfn:
144 __x._M_leaf_pos = __curr_start_pos;
145 goto done;
146 case __detail::_S_concat:
147 {
148 _Rope_RopeConcatenation<_CharT, _Alloc>* __c =
149 (_Rope_RopeConcatenation<_CharT, _Alloc>*)__curr_rope;
150 _RopeRep* __left = __c->_M_left;
151 size_t __left_len = __left->_M_size;
152
153 __dirns <<= 1;
154 if (__pos >= __curr_start_pos + __left_len)
155 {
156 __dirns |= 1;
157 __curr_rope = __c->_M_right;
158 __curr_start_pos += __left_len;
159 }
160 else
161 __curr_rope = __left;
162 }
163 break;
164 }
165 }
166 done:
167 // Copy last section of path into _M_path_end.
168 {
169 int __i = -1;
170 int __j = __curr_depth + 1 - int(_S_path_cache_len);
171
172 if (__j < 0) __j = 0;
173 while (__j <= __curr_depth)
174 __x._M_path_end[++__i] = __path[__j++];
175 __x._M_leaf_index = __i;
176 }
177 __x._M_path_directions = __dirns;
178 _S_setbuf(__x);
179 }
180
181 // Specialized version of the above. Assumes that
182 // the path cache is valid for the previous position.
183 template <class _CharT, class _Alloc>
184 void
185 _Rope_iterator_base<_CharT, _Alloc>::
186 _S_setcache_for_incr(_Rope_iterator_base<_CharT, _Alloc>& __x)
187 {
188 using std::size_t;
189 int __current_index = __x._M_leaf_index;
190 const _RopeRep* __current_node = __x._M_path_end[__current_index];
191 size_t __len = __current_node->_M_size;
192 size_t __node_start_pos = __x._M_leaf_pos;
193 unsigned char __dirns = __x._M_path_directions;
194 _Rope_RopeConcatenation<_CharT, _Alloc>* __c;
195
196 if (__x._M_current_pos - __node_start_pos < __len)
197 {
198 /* More stuff in this leaf, we just didn't cache it. */
199 _S_setbuf(__x);
200 return;
201 }
202 // node_start_pos is starting position of last_node.
203 while (--__current_index >= 0)
204 {
205 if (!(__dirns & 1) /* Path turned left */)
206 break;
207 __current_node = __x._M_path_end[__current_index];
208 __c = (_Rope_RopeConcatenation<_CharT, _Alloc>*)__current_node;
209 // Otherwise we were in the right child. Thus we should pop
210 // the concatenation node.
211 __node_start_pos -= __c->_M_left->_M_size;
212 __dirns >>= 1;
213 }
214 if (__current_index < 0)
215 {
216 // We underflowed the cache. Punt.
217 _S_setcache(__x);
218 return;
219 }
220 __current_node = __x._M_path_end[__current_index];
221 __c = (_Rope_RopeConcatenation<_CharT, _Alloc>*)__current_node;
222 // current_node is a concatenation node. We are positioned on the first
223 // character in its right child.
224 // node_start_pos is starting position of current_node.
225 __node_start_pos += __c->_M_left->_M_size;
226 __current_node = __c->_M_right;
227 __x._M_path_end[++__current_index] = __current_node;
228 __dirns |= 1;
229 while (__detail::_S_concat == __current_node->_M_tag)
230 {
231 ++__current_index;
232 if (int(_S_path_cache_len) == __current_index)
233 {
234 int __i;
235 for (__i = 0; __i < int(_S_path_cache_len) - 1; __i++)
236 __x._M_path_end[__i] = __x._M_path_end[__i+1];
237 --__current_index;
238 }
239 __current_node =
240 ((_Rope_RopeConcatenation<_CharT, _Alloc>*)__current_node)->_M_left;
241 __x._M_path_end[__current_index] = __current_node;
242 __dirns <<= 1;
243 // node_start_pos is unchanged.
244 }
245 __x._M_leaf_index = __current_index;
246 __x._M_leaf_pos = __node_start_pos;
247 __x._M_path_directions = __dirns;
248 _S_setbuf(__x);
249 }
250
251 template <class _CharT, class _Alloc>
252 void
253 _Rope_iterator_base<_CharT, _Alloc>::
254 _M_incr(std::size_t __n)
255 {
256 _M_current_pos += __n;
257 if (0 != _M_buf_ptr)
258 {
259 std::size_t __chars_left = _M_buf_end - _M_buf_ptr;
260 if (__chars_left > __n)
261 _M_buf_ptr += __n;
262 else if (__chars_left == __n)
263 {
264 _M_buf_ptr += __n;
265 _S_setcache_for_incr(*this);
266 }
267 else
268 _M_buf_ptr = 0;
269 }
270 }
271
272 template <class _CharT, class _Alloc>
273 void
274 _Rope_iterator_base<_CharT, _Alloc>::
275 _M_decr(std::size_t __n)
276 {
277 if (0 != _M_buf_ptr)
278 {
279 std::size_t __chars_left = _M_buf_ptr - _M_buf_start;
280 if (__chars_left >= __n)
281 _M_buf_ptr -= __n;
282 else
283 _M_buf_ptr = 0;
284 }
285 _M_current_pos -= __n;
286 }
287
288 template <class _CharT, class _Alloc>
289 void
290 _Rope_iterator<_CharT, _Alloc>::
291 _M_check()
292 {
293 if (_M_root_rope->_M_tree_ptr != this->_M_root)
294 {
295 // _Rope was modified. Get things fixed up.
296 _RopeRep::_S_unref(this->_M_root);
297 this->_M_root = _M_root_rope->_M_tree_ptr;
298 _RopeRep::_S_ref(this->_M_root);
299 this->_M_buf_ptr = 0;
300 }
301 }
302
303 template <class _CharT, class _Alloc>
304 inline
305 _Rope_const_iterator<_CharT, _Alloc>::
306 _Rope_const_iterator(const _Rope_iterator<_CharT, _Alloc>& __x)
307 : _Rope_iterator_base<_CharT, _Alloc>(__x)
308 { }
309
310 template <class _CharT, class _Alloc>
311 inline
312 _Rope_iterator<_CharT, _Alloc>::
313 _Rope_iterator(rope<_CharT, _Alloc>& __r, std::size_t __pos)
314 : _Rope_iterator_base<_CharT,_Alloc>(__r._M_tree_ptr, __pos),
315 _M_root_rope(&__r)
316 { _RopeRep::_S_ref(this->_M_root); }
317
318 template <class _CharT, class _Alloc>
319 inline std::size_t
320 rope<_CharT, _Alloc>::
321 _S_char_ptr_len(const _CharT* __s)
322 {
323 const _CharT* __p = __s;
324
325 while (!_S_is0(*__p))
326 ++__p;
327 return (__p - __s);
328 }
329
330
331 #ifndef __GC
332
333 template <class _CharT, class _Alloc>
334 inline void
335 _Rope_RopeRep<_CharT, _Alloc>::
336 _M_free_c_string()
337 {
338 _CharT* __cstr = _M_c_string;
339 if (0 != __cstr)
340 {
341 std::size_t __size = this->_M_size + 1;
342 std::_Destroy(__cstr, __cstr + __size, _M_get_allocator());
343 this->_Data_deallocate(__cstr, __size);
344 }
345 }
346
347 template <class _CharT, class _Alloc>
348 inline void
349 _Rope_RopeRep<_CharT, _Alloc>::
350 _S_free_string(_CharT* __s, std::size_t __n, allocator_type& __a)
351 {
352 if (!_S_is_basic_char_type((_CharT*)0))
353 std::_Destroy(__s, __s + __n, __a);
354
355 // This has to be a static member, so this gets a bit messy
356 __a.deallocate(__s,
357 _Rope_RopeLeaf<_CharT, _Alloc>::_S_rounded_up_size(__n));
358 }
359
360 // There are several reasons for not doing this with virtual destructors
361 // and a class specific delete operator:
362 // - A class specific delete operator can't easily get access to
363 // allocator instances if we need them.
364 // - Any virtual function would need a 4 or byte vtable pointer;
365 // this only requires a one byte tag per object.
366 template <class _CharT, class _Alloc>
367 void
368 _Rope_RopeRep<_CharT, _Alloc>::
369 _M_free_tree()
370 {
371 switch(_M_tag)
372 {
373 case __detail::_S_leaf:
374 {
375 _Rope_RopeLeaf<_CharT, _Alloc>* __l
376 = (_Rope_RopeLeaf<_CharT, _Alloc>*)this;
377 __l->_Rope_RopeLeaf<_CharT, _Alloc>::~_Rope_RopeLeaf();
378 this->_L_deallocate(__l, 1);
379 break;
380 }
381 case __detail::_S_concat:
382 {
383 _Rope_RopeConcatenation<_CharT,_Alloc>* __c
384 = (_Rope_RopeConcatenation<_CharT, _Alloc>*)this;
385 __c->_Rope_RopeConcatenation<_CharT, _Alloc>::
386 ~_Rope_RopeConcatenation();
387 this->_C_deallocate(__c, 1);
388 break;
389 }
390 case __detail::_S_function:
391 {
392 _Rope_RopeFunction<_CharT, _Alloc>* __f
393 = (_Rope_RopeFunction<_CharT, _Alloc>*)this;
394 __f->_Rope_RopeFunction<_CharT, _Alloc>::~_Rope_RopeFunction();
395 this->_F_deallocate(__f, 1);
396 break;
397 }
398 case __detail::_S_substringfn:
399 {
400 _Rope_RopeSubstring<_CharT, _Alloc>* __ss =
401 (_Rope_RopeSubstring<_CharT, _Alloc>*)this;
402 __ss->_Rope_RopeSubstring<_CharT, _Alloc>::
403 ~_Rope_RopeSubstring();
404 this->_S_deallocate(__ss, 1);
405 break;
406 }
407 }
408 }
409 #else
410
411 template <class _CharT, class _Alloc>
412 inline void
413 _Rope_RopeRep<_CharT, _Alloc>::
414 _S_free_string(const _CharT*, std::size_t, allocator_type)
415 { }
416
417 #endif
418
419 // Concatenate a C string onto a leaf rope by copying the rope data.
420 // Used for short ropes.
421 template <class _CharT, class _Alloc>
422 typename rope<_CharT, _Alloc>::_RopeLeaf*
423 rope<_CharT, _Alloc>::
424 _S_leaf_concat_char_iter(_RopeLeaf* __r, const _CharT* __iter,
425 std::size_t __len)
426 {
427 std::size_t __old_len = __r->_M_size;
428 _CharT* __new_data = (_CharT*)
429 rope::_Data_allocate(_S_rounded_up_size(__old_len + __len));
430 _RopeLeaf* __result;
431
432 uninitialized_copy_n(__r->_M_data, __old_len, __new_data);
433 uninitialized_copy_n(__iter, __len, __new_data + __old_len);
434 _S_cond_store_eos(__new_data[__old_len + __len]);
435 __try
436 {
437 __result = _S_new_RopeLeaf(__new_data, __old_len + __len,
438 __r->_M_get_allocator());
439 }
440 __catch(...)
441 {
442 _RopeRep::__STL_FREE_STRING(__new_data, __old_len + __len,
443 __r->_M_get_allocator());
444 __throw_exception_again;
445 }
446 return __result;
447 }
448
449 #ifndef __GC
450 // As above, but it's OK to clobber original if refcount is 1
451 template <class _CharT, class _Alloc>
452 typename rope<_CharT,_Alloc>::_RopeLeaf*
453 rope<_CharT, _Alloc>::
454 _S_destr_leaf_concat_char_iter(_RopeLeaf* __r, const _CharT* __iter,
455 std::size_t __len)
456 {
457 if (__r->_M_ref_count > 1)
458 return _S_leaf_concat_char_iter(__r, __iter, __len);
459 std::size_t __old_len = __r->_M_size;
460 if (_S_allocated_capacity(__old_len) >= __old_len + __len)
461 {
462 // The space has been partially initialized for the standard
463 // character types. But that doesn't matter for those types.
464 uninitialized_copy_n(__iter, __len, __r->_M_data + __old_len);
465 if (_S_is_basic_char_type((_CharT*)0))
466 _S_cond_store_eos(__r->_M_data[__old_len + __len]);
467 else if (__r->_M_c_string != __r->_M_data && 0 != __r->_M_c_string)
468 {
469 __r->_M_free_c_string();
470 __r->_M_c_string = 0;
471 }
472 __r->_M_size = __old_len + __len;
473 __r->_M_ref_count = 2;
474 return __r;
475 }
476 else
477 {
478 _RopeLeaf* __result = _S_leaf_concat_char_iter(__r, __iter, __len);
479 return __result;
480 }
481 }
482 #endif
483
484 // Assumes left and right are not 0.
485 // Does not increment (nor decrement on exception) child reference counts.
486 // Result has ref count 1.
487 template <class _CharT, class _Alloc>
488 typename rope<_CharT, _Alloc>::_RopeRep*
489 rope<_CharT, _Alloc>::
490 _S_tree_concat(_RopeRep* __left, _RopeRep* __right)
491 {
492 using std::size_t;
493 _RopeConcatenation* __result = _S_new_RopeConcatenation(__left, __right,
494 __left->
495 _M_get_allocator());
496 size_t __depth = __result->_M_depth;
497
498 if (__depth > 20
499 && (__result->_M_size < 1000
500 || __depth > size_t(__detail::_S_max_rope_depth)))
501 {
502 _RopeRep* __balanced;
503
504 __try
505 {
506 __balanced = _S_balance(__result);
507 __result->_M_unref_nonnil();
508 }
509 __catch(...)
510 {
511 rope::_C_deallocate(__result,1);
512 __throw_exception_again;
513 }
514 // In case of exception, we need to deallocate
515 // otherwise dangling result node. But caller
516 // still owns its children. Thus unref is
517 // inappropriate.
518 return __balanced;
519 }
520 else
521 return __result;
522 }
523
524 template <class _CharT, class _Alloc>
525 typename rope<_CharT, _Alloc>::_RopeRep*
526 rope<_CharT, _Alloc>::
527 _S_concat_char_iter(_RopeRep* __r, const _CharT*__s, std::size_t __slen,
528 allocator_type& __a)
529 {
530 using std::size_t;
531 _RopeRep* __result;
532 if (0 == __slen)
533 {
534 _S_ref(__r);
535 return __r;
536 }
537 if (0 == __r)
538 return __STL_ROPE_FROM_UNOWNED_CHAR_PTR(__s, __slen, __a);
539 if (__r->_M_tag == __detail::_S_leaf
540 && __r->_M_size + __slen <= size_t(_S_copy_max))
541 {
542 __result = _S_leaf_concat_char_iter((_RopeLeaf*)__r, __s, __slen);
543 return __result;
544 }
545 if (__detail::_S_concat == __r->_M_tag
546 && __detail::_S_leaf == ((_RopeConcatenation*) __r)->_M_right->_M_tag)
547 {
548 _RopeLeaf* __right =
549 (_RopeLeaf* )(((_RopeConcatenation* )__r)->_M_right);
550 if (__right->_M_size + __slen <= size_t(_S_copy_max))
551 {
552 _RopeRep* __left = ((_RopeConcatenation*)__r)->_M_left;
553 _RopeRep* __nright =
554 _S_leaf_concat_char_iter((_RopeLeaf*)__right, __s, __slen);
555 __left->_M_ref_nonnil();
556 __try
557 { __result = _S_tree_concat(__left, __nright); }
558 __catch(...)
559 {
560 _S_unref(__left);
561 _S_unref(__nright);
562 __throw_exception_again;
563 }
564 return __result;
565 }
566 }
567 _RopeRep* __nright = __STL_ROPE_FROM_UNOWNED_CHAR_PTR(__s, __slen, __a);
568 __try
569 {
570 __r->_M_ref_nonnil();
571 __result = _S_tree_concat(__r, __nright);
572 }
573 __catch(...)
574 {
575 _S_unref(__r);
576 _S_unref(__nright);
577 __throw_exception_again;
578 }
579 return __result;
580 }
581
582 #ifndef __GC
583 template <class _CharT, class _Alloc>
584 typename rope<_CharT,_Alloc>::_RopeRep*
585 rope<_CharT,_Alloc>::
586 _S_destr_concat_char_iter(_RopeRep* __r, const _CharT* __s,
587 std::size_t __slen, allocator_type& __a)
588 {
589 using std::size_t;
590 _RopeRep* __result;
591 if (0 == __r)
592 return __STL_ROPE_FROM_UNOWNED_CHAR_PTR(__s, __slen, __a);
593 size_t __count = __r->_M_ref_count;
594 size_t __orig_size = __r->_M_size;
595 if (__count > 1)
596 return _S_concat_char_iter(__r, __s, __slen, __a);
597 if (0 == __slen)
598 {
599 __r->_M_ref_count = 2; // One more than before
600 return __r;
601 }
602 if (__orig_size + __slen <= size_t(_S_copy_max)
603 && __detail::_S_leaf == __r->_M_tag)
604 {
605 __result = _S_destr_leaf_concat_char_iter((_RopeLeaf*)__r, __s,
606 __slen);
607 return __result;
608 }
609 if (__detail::_S_concat == __r->_M_tag)
610 {
611 _RopeLeaf* __right = (_RopeLeaf*)(((_RopeConcatenation*)
612 __r)->_M_right);
613 if (__detail::_S_leaf == __right->_M_tag
614 && __right->_M_size + __slen <= size_t(_S_copy_max))
615 {
616 _RopeRep* __new_right =
617 _S_destr_leaf_concat_char_iter(__right, __s, __slen);
618 if (__right == __new_right)
619 __new_right->_M_ref_count = 1;
620 else
621 __right->_M_unref_nonnil();
622 __r->_M_ref_count = 2; // One more than before.
623 ((_RopeConcatenation*)__r)->_M_right = __new_right;
624 __r->_M_size = __orig_size + __slen;
625 if (0 != __r->_M_c_string)
626 {
627 __r->_M_free_c_string();
628 __r->_M_c_string = 0;
629 }
630 return __r;
631 }
632 }
633 _RopeRep* __right = __STL_ROPE_FROM_UNOWNED_CHAR_PTR(__s, __slen, __a);
634 __r->_M_ref_nonnil();
635 __try
636 { __result = _S_tree_concat(__r, __right); }
637 __catch(...)
638 {
639 _S_unref(__r);
640 _S_unref(__right);
641 __throw_exception_again;
642 }
643 return __result;
644 }
645 #endif /* !__GC */
646
647 template <class _CharT, class _Alloc>
648 typename rope<_CharT, _Alloc>::_RopeRep*
649 rope<_CharT, _Alloc>::
650 _S_concat(_RopeRep* __left, _RopeRep* __right)
651 {
652 using std::size_t;
653 if (0 == __left)
654 {
655 _S_ref(__right);
656 return __right;
657 }
658 if (0 == __right)
659 {
660 __left->_M_ref_nonnil();
661 return __left;
662 }
663 if (__detail::_S_leaf == __right->_M_tag)
664 {
665 if (__detail::_S_leaf == __left->_M_tag)
666 {
667 if (__right->_M_size + __left->_M_size <= size_t(_S_copy_max))
668 return _S_leaf_concat_char_iter((_RopeLeaf*)__left,
669 ((_RopeLeaf*)__right)->_M_data,
670 __right->_M_size);
671 }
672 else if (__detail::_S_concat == __left->_M_tag
673 && __detail::_S_leaf == ((_RopeConcatenation*)
674 __left)->_M_right->_M_tag)
675 {
676 _RopeLeaf* __leftright =
677 (_RopeLeaf*)(((_RopeConcatenation*)__left)->_M_right);
678 if (__leftright->_M_size
679 + __right->_M_size <= size_t(_S_copy_max))
680 {
681 _RopeRep* __leftleft = ((_RopeConcatenation*)__left)->_M_left;
682 _RopeRep* __rest = _S_leaf_concat_char_iter(__leftright,
683 ((_RopeLeaf*)
684 __right)->
685 _M_data,
686 __right->_M_size);
687 __leftleft->_M_ref_nonnil();
688 __try
689 { return(_S_tree_concat(__leftleft, __rest)); }
690 __catch(...)
691 {
692 _S_unref(__leftleft);
693 _S_unref(__rest);
694 __throw_exception_again;
695 }
696 }
697 }
698 }
699 __left->_M_ref_nonnil();
700 __right->_M_ref_nonnil();
701 __try
702 { return(_S_tree_concat(__left, __right)); }
703 __catch(...)
704 {
705 _S_unref(__left);
706 _S_unref(__right);
707 __throw_exception_again;
708 }
709 }
710
711 template <class _CharT, class _Alloc>
712 typename rope<_CharT, _Alloc>::_RopeRep*
713 rope<_CharT, _Alloc>::
714 _S_substring(_RopeRep* __base, std::size_t __start, std::size_t __endp1)
715 {
716 using std::size_t;
717 if (0 == __base)
718 return 0;
719 size_t __len = __base->_M_size;
720 size_t __adj_endp1;
721 const size_t __lazy_threshold = 128;
722
723 if (__endp1 >= __len)
724 {
725 if (0 == __start)
726 {
727 __base->_M_ref_nonnil();
728 return __base;
729 }
730 else
731 __adj_endp1 = __len;
732
733 }
734 else
735 __adj_endp1 = __endp1;
736
737 switch(__base->_M_tag)
738 {
739 case __detail::_S_concat:
740 {
741 _RopeConcatenation* __c = (_RopeConcatenation*)__base;
742 _RopeRep* __left = __c->_M_left;
743 _RopeRep* __right = __c->_M_right;
744 size_t __left_len = __left->_M_size;
745 _RopeRep* __result;
746
747 if (__adj_endp1 <= __left_len)
748 return _S_substring(__left, __start, __endp1);
749 else if (__start >= __left_len)
750 return _S_substring(__right, __start - __left_len,
751 __adj_endp1 - __left_len);
752 _Self_destruct_ptr __left_result(_S_substring(__left,
753 __start,
754 __left_len));
755 _Self_destruct_ptr __right_result(_S_substring(__right, 0,
756 __endp1
757 - __left_len));
758 __result = _S_concat(__left_result, __right_result);
759 return __result;
760 }
761 case __detail::_S_leaf:
762 {
763 _RopeLeaf* __l = (_RopeLeaf*)__base;
764 _RopeLeaf* __result;
765 size_t __result_len;
766 if (__start >= __adj_endp1)
767 return 0;
768 __result_len = __adj_endp1 - __start;
769 if (__result_len > __lazy_threshold)
770 goto lazy;
771 #ifdef __GC
772 const _CharT* __section = __l->_M_data + __start;
773 __result = _S_new_RopeLeaf(__section, __result_len,
774 __base->_M_get_allocator());
775 __result->_M_c_string = 0; // Not eos terminated.
776 #else
777 // We should sometimes create substring node instead.
778 __result = __STL_ROPE_FROM_UNOWNED_CHAR_PTR(__l->_M_data + __start,
779 __result_len,
780 __base->
781 _M_get_allocator());
782 #endif
783 return __result;
784 }
785 case __detail::_S_substringfn:
786 // Avoid introducing multiple layers of substring nodes.
787 {
788 _RopeSubstring* __old = (_RopeSubstring*)__base;
789 size_t __result_len;
790 if (__start >= __adj_endp1)
791 return 0;
792 __result_len = __adj_endp1 - __start;
793 if (__result_len > __lazy_threshold)
794 {
795 _RopeSubstring* __result =
796 _S_new_RopeSubstring(__old->_M_base,
797 __start + __old->_M_start,
798 __adj_endp1 - __start,
799 __base->_M_get_allocator());
800 return __result;
801
802 } // *** else fall through: ***
803 }
804 case __detail::_S_function:
805 {
806 _RopeFunction* __f = (_RopeFunction*)__base;
807 _CharT* __section;
808 size_t __result_len;
809 if (__start >= __adj_endp1)
810 return 0;
811 __result_len = __adj_endp1 - __start;
812
813 if (__result_len > __lazy_threshold)
814 goto lazy;
815 __section = (_CharT*)
816 rope::_Data_allocate(_S_rounded_up_size(__result_len));
817 __try
818 { (*(__f->_M_fn))(__start, __result_len, __section); }
819 __catch(...)
820 {
821 _RopeRep::__STL_FREE_STRING(__section, __result_len,
822 __base->_M_get_allocator());
823 __throw_exception_again;
824 }
825 _S_cond_store_eos(__section[__result_len]);
826 return _S_new_RopeLeaf(__section, __result_len,
827 __base->_M_get_allocator());
828 }
829 }
830 lazy:
831 {
832 // Create substring node.
833 return _S_new_RopeSubstring(__base, __start, __adj_endp1 - __start,
834 __base->_M_get_allocator());
835 }
836 }
837
838 template<class _CharT>
839 class _Rope_flatten_char_consumer
840 : public _Rope_char_consumer<_CharT>
841 {
842 private:
843 _CharT* _M_buf_ptr;
844 public:
845
846 _Rope_flatten_char_consumer(_CharT* __buffer)
847 { _M_buf_ptr = __buffer; }
848
849 ~_Rope_flatten_char_consumer() {}
850
851 bool
852 operator()(const _CharT* __leaf, std::size_t __n)
853 {
854 uninitialized_copy_n(__leaf, __n, _M_buf_ptr);
855 _M_buf_ptr += __n;
856 return true;
857 }
858 };
859
860 template<class _CharT>
861 class _Rope_find_char_char_consumer
862 : public _Rope_char_consumer<_CharT>
863 {
864 private:
865 _CharT _M_pattern;
866 public:
867 std::size_t _M_count; // Number of nonmatching characters
868
869 _Rope_find_char_char_consumer(_CharT __p)
870 : _M_pattern(__p), _M_count(0) {}
871
872 ~_Rope_find_char_char_consumer() {}
873
874 bool
875 operator()(const _CharT* __leaf, std::size_t __n)
876 {
877 std::size_t __i;
878 for (__i = 0; __i < __n; __i++)
879 {
880 if (__leaf[__i] == _M_pattern)
881 {
882 _M_count += __i;
883 return false;
884 }
885 }
886 _M_count += __n; return true;
887 }
888 };
889
890 template<class _CharT, class _Traits>
891 // Here _CharT is both the stream and rope character type.
892 class _Rope_insert_char_consumer
893 : public _Rope_char_consumer<_CharT>
894 {
895 private:
896 typedef std::basic_ostream<_CharT,_Traits> _Insert_ostream;
897 _Insert_ostream& _M_o;
898 public:
899 _Rope_insert_char_consumer(_Insert_ostream& __writer)
900 : _M_o(__writer) {}
901 ~_Rope_insert_char_consumer() { }
902 // Caller is presumed to own the ostream
903 bool operator() (const _CharT* __leaf, std::size_t __n);
904 // Returns true to continue traversal.
905 };
906
907 template<class _CharT, class _Traits>
908 bool
909 _Rope_insert_char_consumer<_CharT, _Traits>::
910 operator()(const _CharT* __leaf, std::size_t __n)
911 {
912 std::size_t __i;
913 // We assume that formatting is set up correctly for each element.
914 for (__i = 0; __i < __n; __i++)
915 _M_o.put(__leaf[__i]);
916 return true;
917 }
918
919 template <class _CharT, class _Alloc>
920 bool
921 rope<_CharT, _Alloc>::
922 _S_apply_to_pieces(_Rope_char_consumer<_CharT>& __c, const _RopeRep* __r,
923 std::size_t __begin, std::size_t __end)
924 {
925 using std::size_t;
926 if (0 == __r)
927 return true;
928 switch(__r->_M_tag)
929 {
930 case __detail::_S_concat:
931 {
932 _RopeConcatenation* __conc = (_RopeConcatenation*)__r;
933 _RopeRep* __left = __conc->_M_left;
934 size_t __left_len = __left->_M_size;
935 if (__begin < __left_len)
936 {
937 size_t __left_end = std::min(__left_len, __end);
938 if (!_S_apply_to_pieces(__c, __left, __begin, __left_end))
939 return false;
940 }
941 if (__end > __left_len)
942 {
943 _RopeRep* __right = __conc->_M_right;
944 size_t __right_start = std::max(__left_len, __begin);
945 if (!_S_apply_to_pieces(__c, __right,
946 __right_start - __left_len,
947 __end - __left_len))
948 return false;
949 }
950 }
951 return true;
952 case __detail::_S_leaf:
953 {
954 _RopeLeaf* __l = (_RopeLeaf*)__r;
955 return __c(__l->_M_data + __begin, __end - __begin);
956 }
957 case __detail::_S_function:
958 case __detail::_S_substringfn:
959 {
960 _RopeFunction* __f = (_RopeFunction*)__r;
961 size_t __len = __end - __begin;
962 bool __result;
963 _CharT* __buffer =
964 (_CharT*)_Alloc().allocate(__len * sizeof(_CharT));
965 __try
966 {
967 (*(__f->_M_fn))(__begin, __len, __buffer);
968 __result = __c(__buffer, __len);
969 _Alloc().deallocate(__buffer, __len * sizeof(_CharT));
970 }
971 __catch(...)
972 {
973 _Alloc().deallocate(__buffer, __len * sizeof(_CharT));
974 __throw_exception_again;
975 }
976 return __result;
977 }
978 default:
979 return false;
980 }
981 }
982
983 template<class _CharT, class _Traits>
984 inline void
985 _Rope_fill(std::basic_ostream<_CharT, _Traits>& __o, std::size_t __n)
986 {
987 char __f = __o.fill();
988 std::size_t __i;
989
990 for (__i = 0; __i < __n; __i++)
991 __o.put(__f);
992 }
993
994
995 template <class _CharT>
996 inline bool
997 _Rope_is_simple(_CharT*)
998 { return false; }
999
1000 inline bool
1001 _Rope_is_simple(char*)
1002 { return true; }
1003
1004 inline bool
1005 _Rope_is_simple(wchar_t*)
1006 { return true; }
1007
1008 template<class _CharT, class _Traits, class _Alloc>
1009 std::basic_ostream<_CharT, _Traits>&
1010 operator<<(std::basic_ostream<_CharT, _Traits>& __o,
1011 const rope<_CharT, _Alloc>& __r)
1012 {
1013 using std::size_t;
1014 size_t __w = __o.width();
1015 bool __left = bool(__o.flags() & std::ios::left);
1016 size_t __pad_len;
1017 size_t __rope_len = __r.size();
1018 _Rope_insert_char_consumer<_CharT, _Traits> __c(__o);
1019 bool __is_simple = _Rope_is_simple((_CharT*)0);
1020
1021 if (__rope_len < __w)
1022 __pad_len = __w - __rope_len;
1023 else
1024 __pad_len = 0;
1025
1026 if (!__is_simple)
1027 __o.width(__w / __rope_len);
1028 __try
1029 {
1030 if (__is_simple && !__left && __pad_len > 0)
1031 _Rope_fill(__o, __pad_len);
1032 __r.apply_to_pieces(0, __r.size(), __c);
1033 if (__is_simple && __left && __pad_len > 0)
1034 _Rope_fill(__o, __pad_len);
1035 if (!__is_simple)
1036 __o.width(__w);
1037 }
1038 __catch(...)
1039 {
1040 if (!__is_simple)
1041 __o.width(__w);
1042 __throw_exception_again;
1043 }
1044 return __o;
1045 }
1046
1047 template <class _CharT, class _Alloc>
1048 _CharT*
1049 rope<_CharT, _Alloc>::
1050 _S_flatten(_RopeRep* __r, std::size_t __start, std::size_t __len,
1051 _CharT* __buffer)
1052 {
1053 _Rope_flatten_char_consumer<_CharT> __c(__buffer);
1054 _S_apply_to_pieces(__c, __r, __start, __start + __len);
1055 return(__buffer + __len);
1056 }
1057
1058 template <class _CharT, class _Alloc>
1059 std::size_t
1060 rope<_CharT, _Alloc>::
1061 find(_CharT __pattern, std::size_t __start) const
1062 {
1063 _Rope_find_char_char_consumer<_CharT> __c(__pattern);
1064 _S_apply_to_pieces(__c, this->_M_tree_ptr, __start, size());
1065 size_type __result_pos = __start + __c._M_count;
1066 #ifndef __STL_OLD_ROPE_SEMANTICS
1067 if (__result_pos == size())
1068 __result_pos = npos;
1069 #endif
1070 return __result_pos;
1071 }
1072
1073 template <class _CharT, class _Alloc>
1074 _CharT*
1075 rope<_CharT, _Alloc>::
1076 _S_flatten(_RopeRep* __r, _CharT* __buffer)
1077 {
1078 if (0 == __r)
1079 return __buffer;
1080 switch(__r->_M_tag)
1081 {
1082 case __detail::_S_concat:
1083 {
1084 _RopeConcatenation* __c = (_RopeConcatenation*)__r;
1085 _RopeRep* __left = __c->_M_left;
1086 _RopeRep* __right = __c->_M_right;
1087 _CharT* __rest = _S_flatten(__left, __buffer);
1088 return _S_flatten(__right, __rest);
1089 }
1090 case __detail::_S_leaf:
1091 {
1092 _RopeLeaf* __l = (_RopeLeaf*)__r;
1093 return copy_n(__l->_M_data, __l->_M_size, __buffer).second;
1094 }
1095 case __detail::_S_function:
1096 case __detail::_S_substringfn:
1097 // We don't yet do anything with substring nodes.
1098 // This needs to be fixed before ropefiles will work well.
1099 {
1100 _RopeFunction* __f = (_RopeFunction*)__r;
1101 (*(__f->_M_fn))(0, __f->_M_size, __buffer);
1102 return __buffer + __f->_M_size;
1103 }
1104 default:
1105 return 0;
1106 }
1107 }
1108
1109 // This needs work for _CharT != char
1110 template <class _CharT, class _Alloc>
1111 void
1112 rope<_CharT, _Alloc>::
1113 _S_dump(_RopeRep* __r, int __indent)
1114 {
1115 using std::printf;
1116 for (int __i = 0; __i < __indent; __i++)
1117 putchar(' ');
1118 if (0 == __r)
1119 {
1120 printf("NULL\n");
1121 return;
1122 }
1123 if (__detail::_S_concat == __r->_M_tag)
1124 {
1125 _RopeConcatenation* __c = (_RopeConcatenation*)__r;
1126 _RopeRep* __left = __c->_M_left;
1127 _RopeRep* __right = __c->_M_right;
1128
1129 #ifdef __GC
1130 printf("Concatenation %p (depth = %d, len = %ld, %s balanced)\n",
1131 __r, __r->_M_depth, __r->_M_size,
1132 __r->_M_is_balanced? "" : "not");
1133 #else
1134 printf("Concatenation %p (rc = %ld, depth = %d, "
1135 "len = %ld, %s balanced)\n",
1136 __r, __r->_M_ref_count, __r->_M_depth, __r->_M_size,
1137 __r->_M_is_balanced? "" : "not");
1138 #endif
1139 _S_dump(__left, __indent + 2);
1140 _S_dump(__right, __indent + 2);
1141 return;
1142 }
1143 else
1144 {
1145 const char* __kind;
1146
1147 switch (__r->_M_tag)
1148 {
1149 case __detail::_S_leaf:
1150 __kind = "Leaf";
1151 break;
1152 case __detail::_S_function:
1153 __kind = "Function";
1154 break;
1155 case __detail::_S_substringfn:
1156 __kind = "Function representing substring";
1157 break;
1158 default:
1159 __kind = "(corrupted kind field!)";
1160 }
1161 #ifdef __GC
1162 printf("%s %p (depth = %d, len = %ld) ",
1163 __kind, __r, __r->_M_depth, __r->_M_size);
1164 #else
1165 printf("%s %p (rc = %ld, depth = %d, len = %ld) ",
1166 __kind, __r, __r->_M_ref_count, __r->_M_depth, __r->_M_size);
1167 #endif
1168 if (_S_is_one_byte_char_type((_CharT*)0))
1169 {
1170 const int __max_len = 40;
1171 _Self_destruct_ptr __prefix(_S_substring(__r, 0, __max_len));
1172 _CharT __buffer[__max_len + 1];
1173 bool __too_big = __r->_M_size > __prefix->_M_size;
1174
1175 _S_flatten(__prefix, __buffer);
1176 __buffer[__prefix->_M_size] = _S_eos((_CharT*)0);
1177 printf("%s%s\n", (char*)__buffer,
1178 __too_big? "...\n" : "\n");
1179 }
1180 else
1181 printf("\n");
1182 }
1183 }
1184
1185 template <class _CharT, class _Alloc>
1186 const unsigned long
1187 rope<_CharT, _Alloc>::
1188 _S_min_len[int(__detail::_S_max_rope_depth) + 1] = {
1189 /* 0 */1, /* 1 */2, /* 2 */3, /* 3 */5, /* 4 */8, /* 5 */13, /* 6 */21,
1190 /* 7 */34, /* 8 */55, /* 9 */89, /* 10 */144, /* 11 */233, /* 12 */377,
1191 /* 13 */610, /* 14 */987, /* 15 */1597, /* 16 */2584, /* 17 */4181,
1192 /* 18 */6765, /* 19 */10946, /* 20 */17711, /* 21 */28657, /* 22 */46368,
1193 /* 23 */75025, /* 24 */121393, /* 25 */196418, /* 26 */317811,
1194 /* 27 */514229, /* 28 */832040, /* 29 */1346269, /* 30 */2178309,
1195 /* 31 */3524578, /* 32 */5702887, /* 33 */9227465, /* 34 */14930352,
1196 /* 35 */24157817, /* 36 */39088169, /* 37 */63245986, /* 38 */102334155,
1197 /* 39 */165580141, /* 40 */267914296, /* 41 */433494437,
1198 /* 42 */701408733, /* 43 */1134903170, /* 44 */1836311903,
1199 /* 45 */2971215073u };
1200 // These are Fibonacci numbers < 2**32.
1201
1202 template <class _CharT, class _Alloc>
1203 typename rope<_CharT, _Alloc>::_RopeRep*
1204 rope<_CharT, _Alloc>::
1205 _S_balance(_RopeRep* __r)
1206 {
1207 _RopeRep* __forest[int(__detail::_S_max_rope_depth) + 1];
1208 _RopeRep* __result = 0;
1209 int __i;
1210 // Invariant:
1211 // The concatenation of forest in descending order is equal to __r.
1212 // __forest[__i]._M_size >= _S_min_len[__i]
1213 // __forest[__i]._M_depth = __i
1214 // References from forest are included in refcount.
1215
1216 for (__i = 0; __i <= int(__detail::_S_max_rope_depth); ++__i)
1217 __forest[__i] = 0;
1218 __try
1219 {
1220 _S_add_to_forest(__r, __forest);
1221 for (__i = 0; __i <= int(__detail::_S_max_rope_depth); ++__i)
1222 if (0 != __forest[__i])
1223 {
1224 #ifndef __GC
1225 _Self_destruct_ptr __old(__result);
1226 #endif
1227 __result = _S_concat(__forest[__i], __result);
1228 __forest[__i]->_M_unref_nonnil();
1229 #if !defined(__GC) && __cpp_exceptions
1230 __forest[__i] = 0;
1231 #endif
1232 }
1233 }
1234 __catch(...)
1235 {
1236 for(__i = 0; __i <= int(__detail::_S_max_rope_depth); __i++)
1237 _S_unref(__forest[__i]);
1238 __throw_exception_again;
1239 }
1240
1241 if (__result->_M_depth > int(__detail::_S_max_rope_depth))
1242 std::__throw_length_error(__N("rope::_S_balance"));
1243 return(__result);
1244 }
1245
1246 template <class _CharT, class _Alloc>
1247 void
1248 rope<_CharT, _Alloc>::
1249 _S_add_to_forest(_RopeRep* __r, _RopeRep** __forest)
1250 {
1251 if (__r->_M_is_balanced)
1252 {
1253 _S_add_leaf_to_forest(__r, __forest);
1254 return;
1255 }
1256
1257 {
1258 _RopeConcatenation* __c = (_RopeConcatenation*)__r;
1259
1260 _S_add_to_forest(__c->_M_left, __forest);
1261 _S_add_to_forest(__c->_M_right, __forest);
1262 }
1263 }
1264
1265
1266 template <class _CharT, class _Alloc>
1267 void
1268 rope<_CharT, _Alloc>::
1269 _S_add_leaf_to_forest(_RopeRep* __r, _RopeRep** __forest)
1270 {
1271 _RopeRep* __insertee; // included in refcount
1272 _RopeRep* __too_tiny = 0; // included in refcount
1273 int __i; // forest[0..__i-1] is empty
1274 std::size_t __s = __r->_M_size;
1275
1276 for (__i = 0; __s >= _S_min_len[__i+1]/* not this bucket */; ++__i)
1277 {
1278 if (0 != __forest[__i])
1279 {
1280 #ifndef __GC
1281 _Self_destruct_ptr __old(__too_tiny);
1282 #endif
1283 __too_tiny = _S_concat_and_set_balanced(__forest[__i],
1284 __too_tiny);
1285 __forest[__i]->_M_unref_nonnil();
1286 __forest[__i] = 0;
1287 }
1288 }
1289 {
1290 #ifndef __GC
1291 _Self_destruct_ptr __old(__too_tiny);
1292 #endif
1293 __insertee = _S_concat_and_set_balanced(__too_tiny, __r);
1294 }
1295 // Too_tiny dead, and no longer included in refcount.
1296 // Insertee is live and included.
1297 for (;; ++__i)
1298 {
1299 if (0 != __forest[__i])
1300 {
1301 #ifndef __GC
1302 _Self_destruct_ptr __old(__insertee);
1303 #endif
1304 __insertee = _S_concat_and_set_balanced(__forest[__i],
1305 __insertee);
1306 __forest[__i]->_M_unref_nonnil();
1307 __forest[__i] = 0;
1308 }
1309 if (__i == int(__detail::_S_max_rope_depth)
1310 || __insertee->_M_size < _S_min_len[__i+1])
1311 {
1312 __forest[__i] = __insertee;
1313 // refcount is OK since __insertee is now dead.
1314 return;
1315 }
1316 }
1317 }
1318
1319 template <class _CharT, class _Alloc>
1320 _CharT
1321 rope<_CharT, _Alloc>::
1322 _S_fetch(_RopeRep* __r, size_type __i)
1323 {
1324 __GC_CONST _CharT* __cstr = __r->_M_c_string;
1325
1326 if (0 != __cstr)
1327 return __cstr[__i];
1328 for(;;)
1329 {
1330 switch(__r->_M_tag)
1331 {
1332 case __detail::_S_concat:
1333 {
1334 _RopeConcatenation* __c = (_RopeConcatenation*)__r;
1335 _RopeRep* __left = __c->_M_left;
1336 std::size_t __left_len = __left->_M_size;
1337
1338 if (__i >= __left_len)
1339 {
1340 __i -= __left_len;
1341 __r = __c->_M_right;
1342 }
1343 else
1344 __r = __left;
1345 }
1346 break;
1347 case __detail::_S_leaf:
1348 {
1349 _RopeLeaf* __l = (_RopeLeaf*)__r;
1350 return __l->_M_data[__i];
1351 }
1352 case __detail::_S_function:
1353 case __detail::_S_substringfn:
1354 {
1355 _RopeFunction* __f = (_RopeFunction*)__r;
1356 _CharT __result;
1357
1358 (*(__f->_M_fn))(__i, 1, &__result);
1359 return __result;
1360 }
1361 }
1362 }
1363 }
1364
1365 #ifndef __GC
1366 // Return a uniquely referenced character slot for the given
1367 // position, or 0 if that's not possible.
1368 template <class _CharT, class _Alloc>
1369 _CharT*
1370 rope<_CharT, _Alloc>::
1371 _S_fetch_ptr(_RopeRep* __r, size_type __i)
1372 {
1373 _RopeRep* __clrstack[__detail::_S_max_rope_depth];
1374 std::size_t __csptr = 0;
1375
1376 for(;;)
1377 {
1378 if (__r->_M_ref_count > 1)
1379 return 0;
1380 switch(__r->_M_tag)
1381 {
1382 case __detail::_S_concat:
1383 {
1384 _RopeConcatenation* __c = (_RopeConcatenation*)__r;
1385 _RopeRep* __left = __c->_M_left;
1386 std::size_t __left_len = __left->_M_size;
1387
1388 if (__c->_M_c_string != 0)
1389 __clrstack[__csptr++] = __c;
1390 if (__i >= __left_len)
1391 {
1392 __i -= __left_len;
1393 __r = __c->_M_right;
1394 }
1395 else
1396 __r = __left;
1397 }
1398 break;
1399 case __detail::_S_leaf:
1400 {
1401 _RopeLeaf* __l = (_RopeLeaf*)__r;
1402 if (__l->_M_c_string != __l->_M_data && __l->_M_c_string != 0)
1403 __clrstack[__csptr++] = __l;
1404 while (__csptr > 0)
1405 {
1406 -- __csptr;
1407 _RopeRep* __d = __clrstack[__csptr];
1408 __d->_M_free_c_string();
1409 __d->_M_c_string = 0;
1410 }
1411 return __l->_M_data + __i;
1412 }
1413 case __detail::_S_function:
1414 case __detail::_S_substringfn:
1415 return 0;
1416 }
1417 }
1418 }
1419 #endif /* __GC */
1420
1421 // The following could be implemented trivially using
1422 // lexicographical_compare_3way.
1423 // We do a little more work to avoid dealing with rope iterators for
1424 // flat strings.
1425 template <class _CharT, class _Alloc>
1426 int
1427 rope<_CharT, _Alloc>::
1428 _S_compare (const _RopeRep* __left, const _RopeRep* __right)
1429 {
1430 std::size_t __left_len;
1431 std::size_t __right_len;
1432
1433 if (0 == __right)
1434 return 0 != __left;
1435 if (0 == __left)
1436 return -1;
1437 __left_len = __left->_M_size;
1438 __right_len = __right->_M_size;
1439 if (__detail::_S_leaf == __left->_M_tag)
1440 {
1441 _RopeLeaf* __l = (_RopeLeaf*) __left;
1442 if (__detail::_S_leaf == __right->_M_tag)
1443 {
1444 _RopeLeaf* __r = (_RopeLeaf*) __right;
1445 return lexicographical_compare_3way(__l->_M_data,
1446 __l->_M_data + __left_len,
1447 __r->_M_data, __r->_M_data
1448 + __right_len);
1449 }
1450 else
1451 {
1452 const_iterator __rstart(__right, 0);
1453 const_iterator __rend(__right, __right_len);
1454 return lexicographical_compare_3way(__l->_M_data, __l->_M_data
1455 + __left_len,
1456 __rstart, __rend);
1457 }
1458 }
1459 else
1460 {
1461 const_iterator __lstart(__left, 0);
1462 const_iterator __lend(__left, __left_len);
1463 if (__detail::_S_leaf == __right->_M_tag)
1464 {
1465 _RopeLeaf* __r = (_RopeLeaf*) __right;
1466 return lexicographical_compare_3way(__lstart, __lend,
1467 __r->_M_data, __r->_M_data
1468 + __right_len);
1469 }
1470 else
1471 {
1472 const_iterator __rstart(__right, 0);
1473 const_iterator __rend(__right, __right_len);
1474 return lexicographical_compare_3way(__lstart, __lend,
1475 __rstart, __rend);
1476 }
1477 }
1478 }
1479
1480 // Assignment to reference proxies.
1481 template <class _CharT, class _Alloc>
1482 _Rope_char_ref_proxy<_CharT, _Alloc>&
1483 _Rope_char_ref_proxy<_CharT, _Alloc>::
1484 operator=(_CharT __c)
1485 {
1486 _RopeRep* __old = _M_root->_M_tree_ptr;
1487 #ifndef __GC
1488 // First check for the case in which everything is uniquely
1489 // referenced. In that case we can do this destructively.
1490 _CharT* __ptr = _My_rope::_S_fetch_ptr(__old, _M_pos);
1491 if (0 != __ptr)
1492 {
1493 *__ptr = __c;
1494 return *this;
1495 }
1496 #endif
1497 _Self_destruct_ptr __left(_My_rope::_S_substring(__old, 0, _M_pos));
1498 _Self_destruct_ptr __right(_My_rope::_S_substring(__old, _M_pos + 1,
1499 __old->_M_size));
1500 typename _RopeRep::allocator_type __a = _M_root->_M_get_allocator();
1501 _Self_destruct_ptr __result_left(_My_rope::
1502 _S_destr_concat_char_iter(__left,
1503 &__c, 1,
1504 __a));
1505
1506 _RopeRep* __result = _My_rope::_S_concat(__result_left, __right);
1507 #ifndef __GC
1508 _RopeRep::_S_unref(__old);
1509 #endif
1510 _M_root->_M_tree_ptr = __result;
1511 return *this;
1512 }
1513
1514 template <class _CharT, class _Alloc>
1515 inline _Rope_char_ref_proxy<_CharT, _Alloc>::
1516 operator _CharT() const
1517 {
1518 if (_M_current_valid)
1519 return _M_current;
1520 else
1521 return _My_rope::_S_fetch(_M_root->_M_tree_ptr, _M_pos);
1522 }
1523
1524 template <class _CharT, class _Alloc>
1525 _Rope_char_ptr_proxy<_CharT, _Alloc>
1526 _Rope_char_ref_proxy<_CharT, _Alloc>::
1527 operator&() const
1528 { return _Rope_char_ptr_proxy<_CharT, _Alloc>(*this); }
1529
1530 template <class _CharT, class _Alloc>
1531 rope<_CharT, _Alloc>::
1532 rope(std::size_t __n, _CharT __c, const allocator_type& __a)
1533 : _Base(__a)
1534 {
1535 using std::__uninitialized_fill_n_a;
1536
1537 rope<_CharT,_Alloc> __result;
1538 const std::size_t __exponentiate_threshold = 32;
1539 std::size_t __exponent;
1540 std::size_t __rest;
1541 _CharT* __rest_buffer;
1542 _RopeRep* __remainder;
1543 rope<_CharT, _Alloc> __remainder_rope;
1544
1545 if (0 == __n)
1546 return;
1547
1548 __exponent = __n / __exponentiate_threshold;
1549 __rest = __n % __exponentiate_threshold;
1550 if (0 == __rest)
1551 __remainder = 0;
1552 else
1553 {
1554 __rest_buffer = this->_Data_allocate(_S_rounded_up_size(__rest));
1555 __uninitialized_fill_n_a(__rest_buffer, __rest, __c,
1556 _M_get_allocator());
1557 _S_cond_store_eos(__rest_buffer[__rest]);
1558 __try
1559 { __remainder = _S_new_RopeLeaf(__rest_buffer, __rest,
1560 _M_get_allocator()); }
1561 __catch(...)
1562 {
1563 _RopeRep::__STL_FREE_STRING(__rest_buffer, __rest,
1564 _M_get_allocator());
1565 __throw_exception_again;
1566 }
1567 }
1568 __remainder_rope._M_tree_ptr = __remainder;
1569 if (__exponent != 0)
1570 {
1571 _CharT* __base_buffer =
1572 this->_Data_allocate(_S_rounded_up_size(__exponentiate_threshold));
1573 _RopeLeaf* __base_leaf;
1574 rope __base_rope;
1575 __uninitialized_fill_n_a(__base_buffer, __exponentiate_threshold, __c,
1576 _M_get_allocator());
1577 _S_cond_store_eos(__base_buffer[__exponentiate_threshold]);
1578 __try
1579 {
1580 __base_leaf = _S_new_RopeLeaf(__base_buffer,
1581 __exponentiate_threshold,
1582 _M_get_allocator());
1583 }
1584 __catch(...)
1585 {
1586 _RopeRep::__STL_FREE_STRING(__base_buffer,
1587 __exponentiate_threshold,
1588 _M_get_allocator());
1589 __throw_exception_again;
1590 }
1591 __base_rope._M_tree_ptr = __base_leaf;
1592 if (1 == __exponent)
1593 __result = __base_rope;
1594 else
1595 __result = power(__base_rope, __exponent,
1596 _Rope_Concat_fn<_CharT, _Alloc>());
1597
1598 if (0 != __remainder)
1599 __result += __remainder_rope;
1600 }
1601 else
1602 __result = __remainder_rope;
1603
1604 this->_M_tree_ptr = __result._M_tree_ptr;
1605 this->_M_tree_ptr->_M_ref_nonnil();
1606 }
1607
1608 template<class _CharT, class _Alloc>
1609 _CharT
1610 rope<_CharT, _Alloc>::_S_empty_c_str[1];
1611
1612 template<class _CharT, class _Alloc>
1613 const _CharT*
1614 rope<_CharT, _Alloc>::
1615 c_str() const
1616 {
1617 if (0 == this->_M_tree_ptr)
1618 {
1619 _S_empty_c_str[0] = _S_eos((_CharT*)0); // Possibly redundant,
1620 // but probably fast.
1621 return _S_empty_c_str;
1622 }
1623 __gthread_mutex_lock (&this->_M_tree_ptr->_M_c_string_lock);
1624 __GC_CONST _CharT* __result = this->_M_tree_ptr->_M_c_string;
1625 if (0 == __result)
1626 {
1627 std::size_t __s = size();
1628 __result = this->_Data_allocate(__s + 1);
1629 _S_flatten(this->_M_tree_ptr, __result);
1630 __result[__s] = _S_eos((_CharT*)0);
1631 this->_M_tree_ptr->_M_c_string = __result;
1632 }
1633 __gthread_mutex_unlock (&this->_M_tree_ptr->_M_c_string_lock);
1634 return(__result);
1635 }
1636
1637 template<class _CharT, class _Alloc>
1638 const _CharT* rope<_CharT, _Alloc>::
1639 replace_with_c_str()
1640 {
1641 if (0 == this->_M_tree_ptr)
1642 {
1643 _S_empty_c_str[0] = _S_eos((_CharT*)0);
1644 return _S_empty_c_str;
1645 }
1646 __GC_CONST _CharT* __old_c_string = this->_M_tree_ptr->_M_c_string;
1647 if (__detail::_S_leaf == this->_M_tree_ptr->_M_tag
1648 && 0 != __old_c_string)
1649 return(__old_c_string);
1650 std::size_t __s = size();
1651 _CharT* __result = this->_Data_allocate(_S_rounded_up_size(__s));
1652 _S_flatten(this->_M_tree_ptr, __result);
1653 __result[__s] = _S_eos((_CharT*)0);
1654 this->_M_tree_ptr->_M_unref_nonnil();
1655 this->_M_tree_ptr = _S_new_RopeLeaf(__result, __s,
1656 this->_M_get_allocator());
1657 return(__result);
1658 }
1659
1660 // Algorithm specializations. More should be added.
1661
1662 template<class _Rope_iterator> // was templated on CharT and Alloc
1663 void // VC++ workaround
1664 _Rope_rotate(_Rope_iterator __first,
1665 _Rope_iterator __middle,
1666 _Rope_iterator __last)
1667 {
1668 typedef typename _Rope_iterator::value_type _CharT;
1669 typedef typename _Rope_iterator::_allocator_type _Alloc;
1670
1671 rope<_CharT, _Alloc>& __r(__first.container());
1672 rope<_CharT, _Alloc> __prefix = __r.substr(0, __first.index());
1673 rope<_CharT, _Alloc> __suffix =
1674 __r.substr(__last.index(), __r.size() - __last.index());
1675 rope<_CharT, _Alloc> __part1 =
1676 __r.substr(__middle.index(), __last.index() - __middle.index());
1677 rope<_CharT, _Alloc> __part2 =
1678 __r.substr(__first.index(), __middle.index() - __first.index());
1679 __r = __prefix;
1680 __r += __part1;
1681 __r += __part2;
1682 __r += __suffix;
1683 }
1684
1685 #if !defined(__GNUC__)
1686 // Appears to confuse g++
1687 inline void
1688 rotate(_Rope_iterator<char, __STL_DEFAULT_ALLOCATOR(char)> __first,
1689 _Rope_iterator<char, __STL_DEFAULT_ALLOCATOR(char)> __middle,
1690 _Rope_iterator<char, __STL_DEFAULT_ALLOCATOR(char)> __last)
1691 { _Rope_rotate(__first, __middle, __last); }
1692 #endif
1693
1694 # if 0
1695 // Probably not useful for several reasons:
1696 // - for SGIs 7.1 compiler and probably some others,
1697 // this forces lots of rope<wchar_t, ...> instantiations, creating a
1698 // code bloat and compile time problem. (Fixed in 7.2.)
1699 // - wchar_t is 4 bytes wide on most UNIX platforms, making it
1700 // unattractive for unicode strings. Unsigned short may be a better
1701 // character type.
1702 inline void
1703 rotate(_Rope_iterator<wchar_t, __STL_DEFAULT_ALLOCATOR(char)> __first,
1704 _Rope_iterator<wchar_t, __STL_DEFAULT_ALLOCATOR(char)> __middle,
1705 _Rope_iterator<wchar_t, __STL_DEFAULT_ALLOCATOR(char)> __last)
1706 { _Rope_rotate(__first, __middle, __last); }
1707 # endif
1708
1709 _GLIBCXX_END_NAMESPACE_VERSION
1710 } // namespace
1711