libstdc++
ropeimpl.h
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1 // SGI's rope class implementation -*- C++ -*-
2 
3 // Copyright (C) 2001-2015 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 
51 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
52 {
53 _GLIBCXX_BEGIN_NAMESPACE_VERSION
54 
55  using std::size_t;
56  using std::printf;
57  using std::basic_ostream;
58  using std::__throw_length_error;
59  using std::_Destroy;
60  using std::__uninitialized_fill_n_a;
61 
62  // Set buf_start, buf_end, and buf_ptr appropriately, filling tmp_buf
63  // if necessary. Assumes _M_path_end[leaf_index] and leaf_pos are correct.
64  // Results in a valid buf_ptr if the iterator can be legitimately
65  // dereferenced.
66  template <class _CharT, class _Alloc>
67  void
68  _Rope_iterator_base<_CharT, _Alloc>::
69  _S_setbuf(_Rope_iterator_base<_CharT, _Alloc>& __x)
70  {
71  const _RopeRep* __leaf = __x._M_path_end[__x._M_leaf_index];
72  size_t __leaf_pos = __x._M_leaf_pos;
73  size_t __pos = __x._M_current_pos;
74 
75  switch(__leaf->_M_tag)
76  {
77  case __detail::_S_leaf:
78  __x._M_buf_start = ((_Rope_RopeLeaf<_CharT, _Alloc>*)__leaf)->_M_data;
79  __x._M_buf_ptr = __x._M_buf_start + (__pos - __leaf_pos);
80  __x._M_buf_end = __x._M_buf_start + __leaf->_M_size;
81  break;
82  case __detail::_S_function:
83  case __detail::_S_substringfn:
84  {
85  size_t __len = _S_iterator_buf_len;
86  size_t __buf_start_pos = __leaf_pos;
87  size_t __leaf_end = __leaf_pos + __leaf->_M_size;
88  char_producer<_CharT>* __fn = ((_Rope_RopeFunction<_CharT,
89  _Alloc>*)__leaf)->_M_fn;
90  if (__buf_start_pos + __len <= __pos)
91  {
92  __buf_start_pos = __pos - __len / 4;
93  if (__buf_start_pos + __len > __leaf_end)
94  __buf_start_pos = __leaf_end - __len;
95  }
96  if (__buf_start_pos + __len > __leaf_end)
97  __len = __leaf_end - __buf_start_pos;
98  (*__fn)(__buf_start_pos - __leaf_pos, __len, __x._M_tmp_buf);
99  __x._M_buf_ptr = __x._M_tmp_buf + (__pos - __buf_start_pos);
100  __x._M_buf_start = __x._M_tmp_buf;
101  __x._M_buf_end = __x._M_tmp_buf + __len;
102  }
103  break;
104  default:
105  break;
106  }
107  }
108 
109  // Set path and buffer inside a rope iterator. We assume that
110  // pos and root are already set.
111  template <class _CharT, class _Alloc>
112  void
113  _Rope_iterator_base<_CharT, _Alloc>::
114  _S_setcache(_Rope_iterator_base<_CharT, _Alloc>& __x)
115  {
116  const _RopeRep* __path[int(__detail::_S_max_rope_depth) + 1];
117  const _RopeRep* __curr_rope;
118  int __curr_depth = -1; /* index into path */
119  size_t __curr_start_pos = 0;
120  size_t __pos = __x._M_current_pos;
121  unsigned char __dirns = 0; // Bit vector marking right turns in the path
122 
123  if (__pos >= __x._M_root->_M_size)
124  {
125  __x._M_buf_ptr = 0;
126  return;
127  }
128  __curr_rope = __x._M_root;
129  if (0 != __curr_rope->_M_c_string)
130  {
131  /* Treat the root as a leaf. */
132  __x._M_buf_start = __curr_rope->_M_c_string;
133  __x._M_buf_end = __curr_rope->_M_c_string + __curr_rope->_M_size;
134  __x._M_buf_ptr = __curr_rope->_M_c_string + __pos;
135  __x._M_path_end[0] = __curr_rope;
136  __x._M_leaf_index = 0;
137  __x._M_leaf_pos = 0;
138  return;
139  }
140  for(;;)
141  {
142  ++__curr_depth;
143  __path[__curr_depth] = __curr_rope;
144  switch(__curr_rope->_M_tag)
145  {
146  case __detail::_S_leaf:
147  case __detail::_S_function:
148  case __detail::_S_substringfn:
149  __x._M_leaf_pos = __curr_start_pos;
150  goto done;
151  case __detail::_S_concat:
152  {
153  _Rope_RopeConcatenation<_CharT, _Alloc>* __c =
154  (_Rope_RopeConcatenation<_CharT, _Alloc>*)__curr_rope;
155  _RopeRep* __left = __c->_M_left;
156  size_t __left_len = __left->_M_size;
157 
158  __dirns <<= 1;
159  if (__pos >= __curr_start_pos + __left_len)
160  {
161  __dirns |= 1;
162  __curr_rope = __c->_M_right;
163  __curr_start_pos += __left_len;
164  }
165  else
166  __curr_rope = __left;
167  }
168  break;
169  }
170  }
171  done:
172  // Copy last section of path into _M_path_end.
173  {
174  int __i = -1;
175  int __j = __curr_depth + 1 - int(_S_path_cache_len);
176 
177  if (__j < 0) __j = 0;
178  while (__j <= __curr_depth)
179  __x._M_path_end[++__i] = __path[__j++];
180  __x._M_leaf_index = __i;
181  }
182  __x._M_path_directions = __dirns;
183  _S_setbuf(__x);
184  }
185 
186  // Specialized version of the above. Assumes that
187  // the path cache is valid for the previous position.
188  template <class _CharT, class _Alloc>
189  void
190  _Rope_iterator_base<_CharT, _Alloc>::
191  _S_setcache_for_incr(_Rope_iterator_base<_CharT, _Alloc>& __x)
192  {
193  int __current_index = __x._M_leaf_index;
194  const _RopeRep* __current_node = __x._M_path_end[__current_index];
195  size_t __len = __current_node->_M_size;
196  size_t __node_start_pos = __x._M_leaf_pos;
197  unsigned char __dirns = __x._M_path_directions;
198  _Rope_RopeConcatenation<_CharT, _Alloc>* __c;
199 
200  if (__x._M_current_pos - __node_start_pos < __len)
201  {
202  /* More stuff in this leaf, we just didn't cache it. */
203  _S_setbuf(__x);
204  return;
205  }
206  // node_start_pos is starting position of last_node.
207  while (--__current_index >= 0)
208  {
209  if (!(__dirns & 1) /* Path turned left */)
210  break;
211  __current_node = __x._M_path_end[__current_index];
212  __c = (_Rope_RopeConcatenation<_CharT, _Alloc>*)__current_node;
213  // Otherwise we were in the right child. Thus we should pop
214  // the concatenation node.
215  __node_start_pos -= __c->_M_left->_M_size;
216  __dirns >>= 1;
217  }
218  if (__current_index < 0)
219  {
220  // We underflowed the cache. Punt.
221  _S_setcache(__x);
222  return;
223  }
224  __current_node = __x._M_path_end[__current_index];
225  __c = (_Rope_RopeConcatenation<_CharT, _Alloc>*)__current_node;
226  // current_node is a concatenation node. We are positioned on the first
227  // character in its right child.
228  // node_start_pos is starting position of current_node.
229  __node_start_pos += __c->_M_left->_M_size;
230  __current_node = __c->_M_right;
231  __x._M_path_end[++__current_index] = __current_node;
232  __dirns |= 1;
233  while (__detail::_S_concat == __current_node->_M_tag)
234  {
235  ++__current_index;
236  if (int(_S_path_cache_len) == __current_index)
237  {
238  int __i;
239  for (__i = 0; __i < int(_S_path_cache_len) - 1; __i++)
240  __x._M_path_end[__i] = __x._M_path_end[__i+1];
241  --__current_index;
242  }
243  __current_node =
244  ((_Rope_RopeConcatenation<_CharT, _Alloc>*)__current_node)->_M_left;
245  __x._M_path_end[__current_index] = __current_node;
246  __dirns <<= 1;
247  // node_start_pos is unchanged.
248  }
249  __x._M_leaf_index = __current_index;
250  __x._M_leaf_pos = __node_start_pos;
251  __x._M_path_directions = __dirns;
252  _S_setbuf(__x);
253  }
254 
255  template <class _CharT, class _Alloc>
256  void
257  _Rope_iterator_base<_CharT, _Alloc>::
258  _M_incr(size_t __n)
259  {
260  _M_current_pos += __n;
261  if (0 != _M_buf_ptr)
262  {
263  size_t __chars_left = _M_buf_end - _M_buf_ptr;
264  if (__chars_left > __n)
265  _M_buf_ptr += __n;
266  else if (__chars_left == __n)
267  {
268  _M_buf_ptr += __n;
269  _S_setcache_for_incr(*this);
270  }
271  else
272  _M_buf_ptr = 0;
273  }
274  }
275 
276  template <class _CharT, class _Alloc>
277  void
278  _Rope_iterator_base<_CharT, _Alloc>::
279  _M_decr(size_t __n)
280  {
281  if (0 != _M_buf_ptr)
282  {
283  size_t __chars_left = _M_buf_ptr - _M_buf_start;
284  if (__chars_left >= __n)
285  _M_buf_ptr -= __n;
286  else
287  _M_buf_ptr = 0;
288  }
289  _M_current_pos -= __n;
290  }
291 
292  template <class _CharT, class _Alloc>
293  void
294  _Rope_iterator<_CharT, _Alloc>::
295  _M_check()
296  {
297  if (_M_root_rope->_M_tree_ptr != this->_M_root)
298  {
299  // _Rope was modified. Get things fixed up.
300  _RopeRep::_S_unref(this->_M_root);
301  this->_M_root = _M_root_rope->_M_tree_ptr;
302  _RopeRep::_S_ref(this->_M_root);
303  this->_M_buf_ptr = 0;
304  }
305  }
306 
307  template <class _CharT, class _Alloc>
308  inline
309  _Rope_const_iterator<_CharT, _Alloc>::
310  _Rope_const_iterator(const _Rope_iterator<_CharT, _Alloc>& __x)
311  : _Rope_iterator_base<_CharT, _Alloc>(__x)
312  { }
313 
314  template <class _CharT, class _Alloc>
315  inline
316  _Rope_iterator<_CharT, _Alloc>::
317  _Rope_iterator(rope<_CharT, _Alloc>& __r, size_t __pos)
318  : _Rope_iterator_base<_CharT,_Alloc>(__r._M_tree_ptr, __pos),
319  _M_root_rope(&__r)
320  { _RopeRep::_S_ref(this->_M_root); }
321 
322  template <class _CharT, class _Alloc>
323  inline size_t
324  rope<_CharT, _Alloc>::
325  _S_char_ptr_len(const _CharT* __s)
326  {
327  const _CharT* __p = __s;
328 
329  while (!_S_is0(*__p))
330  ++__p;
331  return (__p - __s);
332  }
333 
334 
335 #ifndef __GC
336 
337  template <class _CharT, class _Alloc>
338  inline void
339  _Rope_RopeRep<_CharT, _Alloc>::
340  _M_free_c_string()
341  {
342  _CharT* __cstr = _M_c_string;
343  if (0 != __cstr)
344  {
345  size_t __size = this->_M_size + 1;
346  _Destroy(__cstr, __cstr + __size, _M_get_allocator());
347  this->_Data_deallocate(__cstr, __size);
348  }
349  }
350 
351  template <class _CharT, class _Alloc>
352  inline void
353  _Rope_RopeRep<_CharT, _Alloc>::
354  _S_free_string(_CharT* __s, size_t __n, allocator_type& __a)
355  {
356  if (!_S_is_basic_char_type((_CharT*)0))
357  _Destroy(__s, __s + __n, __a);
358 
359  // This has to be a static member, so this gets a bit messy
360  __a.deallocate(__s,
361  _Rope_RopeLeaf<_CharT, _Alloc>::_S_rounded_up_size(__n));
362  }
363 
364  // There are several reasons for not doing this with virtual destructors
365  // and a class specific delete operator:
366  // - A class specific delete operator can't easily get access to
367  // allocator instances if we need them.
368  // - Any virtual function would need a 4 or byte vtable pointer;
369  // this only requires a one byte tag per object.
370  template <class _CharT, class _Alloc>
371  void
372  _Rope_RopeRep<_CharT, _Alloc>::
373  _M_free_tree()
374  {
375  switch(_M_tag)
376  {
377  case __detail::_S_leaf:
378  {
379  _Rope_RopeLeaf<_CharT, _Alloc>* __l
380  = (_Rope_RopeLeaf<_CharT, _Alloc>*)this;
381  __l->_Rope_RopeLeaf<_CharT, _Alloc>::~_Rope_RopeLeaf();
382  this->_L_deallocate(__l, 1);
383  break;
384  }
385  case __detail::_S_concat:
386  {
387  _Rope_RopeConcatenation<_CharT,_Alloc>* __c
388  = (_Rope_RopeConcatenation<_CharT, _Alloc>*)this;
389  __c->_Rope_RopeConcatenation<_CharT, _Alloc>:: ~_Rope_RopeConcatenation();
390  this->_C_deallocate(__c, 1);
391  break;
392  }
393  case __detail::_S_function:
394  {
395  _Rope_RopeFunction<_CharT, _Alloc>* __f
396  = (_Rope_RopeFunction<_CharT, _Alloc>*)this;
397  __f->_Rope_RopeFunction<_CharT, _Alloc>::~_Rope_RopeFunction();
398  this->_F_deallocate(__f, 1);
399  break;
400  }
401  case __detail::_S_substringfn:
402  {
403  _Rope_RopeSubstring<_CharT, _Alloc>* __ss =
404  (_Rope_RopeSubstring<_CharT, _Alloc>*)this;
405  __ss->_Rope_RopeSubstring<_CharT, _Alloc>:: ~_Rope_RopeSubstring();
406  this->_S_deallocate(__ss, 1);
407  break;
408  }
409  }
410  }
411 #else
412 
413  template <class _CharT, class _Alloc>
414  inline void
415  _Rope_RopeRep<_CharT, _Alloc>::
416  _S_free_string(const _CharT*, size_t, allocator_type)
417  { }
418 
419 #endif
420 
421  // Concatenate a C string onto a leaf rope by copying the rope data.
422  // Used for short ropes.
423  template <class _CharT, class _Alloc>
424  typename rope<_CharT, _Alloc>::_RopeLeaf*
425  rope<_CharT, _Alloc>::
426  _S_leaf_concat_char_iter(_RopeLeaf* __r, const _CharT* __iter, size_t __len)
427  {
428  size_t __old_len = __r->_M_size;
429  _CharT* __new_data = (_CharT*)
430  rope::_Data_allocate(_S_rounded_up_size(__old_len + __len));
431  _RopeLeaf* __result;
432 
433  uninitialized_copy_n(__r->_M_data, __old_len, __new_data);
434  uninitialized_copy_n(__iter, __len, __new_data + __old_len);
435  _S_cond_store_eos(__new_data[__old_len + __len]);
436  __try
437  {
438  __result = _S_new_RopeLeaf(__new_data, __old_len + __len,
439  __r->_M_get_allocator());
440  }
441  __catch(...)
442  {
443  _RopeRep::__STL_FREE_STRING(__new_data, __old_len + __len,
444  __r->_M_get_allocator());
445  __throw_exception_again;
446  }
447  return __result;
448  }
449 
450 #ifndef __GC
451  // As above, but it's OK to clobber original if refcount is 1
452  template <class _CharT, class _Alloc>
453  typename rope<_CharT,_Alloc>::_RopeLeaf*
454  rope<_CharT, _Alloc>::
455  _S_destr_leaf_concat_char_iter(_RopeLeaf* __r, const _CharT* __iter,
456  size_t __len)
457  {
458  if (__r->_M_ref_count > 1)
459  return _S_leaf_concat_char_iter(__r, __iter, __len);
460  size_t __old_len = __r->_M_size;
461  if (_S_allocated_capacity(__old_len) >= __old_len + __len)
462  {
463  // The space has been partially initialized for the standard
464  // character types. But that doesn't matter for those types.
465  uninitialized_copy_n(__iter, __len, __r->_M_data + __old_len);
466  if (_S_is_basic_char_type((_CharT*)0))
467  _S_cond_store_eos(__r->_M_data[__old_len + __len]);
468  else if (__r->_M_c_string != __r->_M_data && 0 != __r->_M_c_string)
469  {
470  __r->_M_free_c_string();
471  __r->_M_c_string = 0;
472  }
473  __r->_M_size = __old_len + __len;
474  __r->_M_ref_count = 2;
475  return __r;
476  }
477  else
478  {
479  _RopeLeaf* __result = _S_leaf_concat_char_iter(__r, __iter, __len);
480  return __result;
481  }
482  }
483 #endif
484 
485  // Assumes left and right are not 0.
486  // Does not increment (nor decrement on exception) child reference counts.
487  // Result has ref count 1.
488  template <class _CharT, class _Alloc>
489  typename rope<_CharT, _Alloc>::_RopeRep*
490  rope<_CharT, _Alloc>::
491  _S_tree_concat(_RopeRep* __left, _RopeRep* __right)
492  {
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, size_t __slen)
528  {
529  _RopeRep* __result;
530  if (0 == __slen)
531  {
532  _S_ref(__r);
533  return __r;
534  }
535  if (0 == __r)
536  return __STL_ROPE_FROM_UNOWNED_CHAR_PTR(__s, __slen,
537  __r->_M_get_allocator());
538  if (__r->_M_tag == __detail::_S_leaf
539  && __r->_M_size + __slen <= size_t(_S_copy_max))
540  {
541  __result = _S_leaf_concat_char_iter((_RopeLeaf*)__r, __s, __slen);
542  return __result;
543  }
544  if (__detail::_S_concat == __r->_M_tag
545  && __detail::_S_leaf == ((_RopeConcatenation*) __r)->_M_right->_M_tag)
546  {
547  _RopeLeaf* __right =
548  (_RopeLeaf* )(((_RopeConcatenation* )__r)->_M_right);
549  if (__right->_M_size + __slen <= size_t(_S_copy_max))
550  {
551  _RopeRep* __left = ((_RopeConcatenation*)__r)->_M_left;
552  _RopeRep* __nright =
553  _S_leaf_concat_char_iter((_RopeLeaf*)__right, __s, __slen);
554  __left->_M_ref_nonnil();
555  __try
556  { __result = _S_tree_concat(__left, __nright); }
557  __catch(...)
558  {
559  _S_unref(__left);
560  _S_unref(__nright);
561  __throw_exception_again;
562  }
563  return __result;
564  }
565  }
566  _RopeRep* __nright =
567  __STL_ROPE_FROM_UNOWNED_CHAR_PTR(__s, __slen, __r->_M_get_allocator());
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, size_t __slen)
587  {
588  _RopeRep* __result;
589  if (0 == __r)
590  return __STL_ROPE_FROM_UNOWNED_CHAR_PTR(__s, __slen,
591  __r->_M_get_allocator());
592  size_t __count = __r->_M_ref_count;
593  size_t __orig_size = __r->_M_size;
594  if (__count > 1)
595  return _S_concat_char_iter(__r, __s, __slen);
596  if (0 == __slen)
597  {
598  __r->_M_ref_count = 2; // One more than before
599  return __r;
600  }
601  if (__orig_size + __slen <= size_t(_S_copy_max)
602  && __detail::_S_leaf == __r->_M_tag)
603  {
604  __result = _S_destr_leaf_concat_char_iter((_RopeLeaf*)__r, __s,
605  __slen);
606  return __result;
607  }
608  if (__detail::_S_concat == __r->_M_tag)
609  {
610  _RopeLeaf* __right = (_RopeLeaf*)(((_RopeConcatenation*)
611  __r)->_M_right);
612  if (__detail::_S_leaf == __right->_M_tag
613  && __right->_M_size + __slen <= size_t(_S_copy_max))
614  {
615  _RopeRep* __new_right =
616  _S_destr_leaf_concat_char_iter(__right, __s, __slen);
617  if (__right == __new_right)
618  __new_right->_M_ref_count = 1;
619  else
620  __right->_M_unref_nonnil();
621  __r->_M_ref_count = 2; // One more than before.
622  ((_RopeConcatenation*)__r)->_M_right = __new_right;
623  __r->_M_size = __orig_size + __slen;
624  if (0 != __r->_M_c_string)
625  {
626  __r->_M_free_c_string();
627  __r->_M_c_string = 0;
628  }
629  return __r;
630  }
631  }
632  _RopeRep* __right =
633  __STL_ROPE_FROM_UNOWNED_CHAR_PTR(__s, __slen, __r->_M_get_allocator());
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  if (0 == __left)
653  {
654  _S_ref(__right);
655  return __right;
656  }
657  if (0 == __right)
658  {
659  __left->_M_ref_nonnil();
660  return __left;
661  }
662  if (__detail::_S_leaf == __right->_M_tag)
663  {
664  if (__detail::_S_leaf == __left->_M_tag)
665  {
666  if (__right->_M_size + __left->_M_size <= size_t(_S_copy_max))
667  return _S_leaf_concat_char_iter((_RopeLeaf*)__left,
668  ((_RopeLeaf*)__right)->_M_data,
669  __right->_M_size);
670  }
671  else if (__detail::_S_concat == __left->_M_tag
672  && __detail::_S_leaf == ((_RopeConcatenation*)
673  __left)->_M_right->_M_tag)
674  {
675  _RopeLeaf* __leftright =
676  (_RopeLeaf*)(((_RopeConcatenation*)__left)->_M_right);
677  if (__leftright->_M_size
678  + __right->_M_size <= size_t(_S_copy_max))
679  {
680  _RopeRep* __leftleft = ((_RopeConcatenation*)__left)->_M_left;
681  _RopeRep* __rest = _S_leaf_concat_char_iter(__leftright,
682  ((_RopeLeaf*)
683  __right)->
684  _M_data,
685  __right->_M_size);
686  __leftleft->_M_ref_nonnil();
687  __try
688  { return(_S_tree_concat(__leftleft, __rest)); }
689  __catch(...)
690  {
691  _S_unref(__leftleft);
692  _S_unref(__rest);
693  __throw_exception_again;
694  }
695  }
696  }
697  }
698  __left->_M_ref_nonnil();
699  __right->_M_ref_nonnil();
700  __try
701  { return(_S_tree_concat(__left, __right)); }
702  __catch(...)
703  {
704  _S_unref(__left);
705  _S_unref(__right);
706  __throw_exception_again;
707  }
708  }
709 
710  template <class _CharT, class _Alloc>
711  typename rope<_CharT, _Alloc>::_RopeRep*
712  rope<_CharT, _Alloc>::
713  _S_substring(_RopeRep* __base, size_t __start, size_t __endp1)
714  {
715  if (0 == __base)
716  return 0;
717  size_t __len = __base->_M_size;
718  size_t __adj_endp1;
719  const size_t __lazy_threshold = 128;
720 
721  if (__endp1 >= __len)
722  {
723  if (0 == __start)
724  {
725  __base->_M_ref_nonnil();
726  return __base;
727  }
728  else
729  __adj_endp1 = __len;
730 
731  }
732  else
733  __adj_endp1 = __endp1;
734 
735  switch(__base->_M_tag)
736  {
737  case __detail::_S_concat:
738  {
739  _RopeConcatenation* __c = (_RopeConcatenation*)__base;
740  _RopeRep* __left = __c->_M_left;
741  _RopeRep* __right = __c->_M_right;
742  size_t __left_len = __left->_M_size;
743  _RopeRep* __result;
744 
745  if (__adj_endp1 <= __left_len)
746  return _S_substring(__left, __start, __endp1);
747  else if (__start >= __left_len)
748  return _S_substring(__right, __start - __left_len,
749  __adj_endp1 - __left_len);
750  _Self_destruct_ptr __left_result(_S_substring(__left,
751  __start,
752  __left_len));
753  _Self_destruct_ptr __right_result(_S_substring(__right, 0,
754  __endp1
755  - __left_len));
756  __result = _S_concat(__left_result, __right_result);
757  return __result;
758  }
759  case __detail::_S_leaf:
760  {
761  _RopeLeaf* __l = (_RopeLeaf*)__base;
762  _RopeLeaf* __result;
763  size_t __result_len;
764  if (__start >= __adj_endp1)
765  return 0;
766  __result_len = __adj_endp1 - __start;
767  if (__result_len > __lazy_threshold)
768  goto lazy;
769 #ifdef __GC
770  const _CharT* __section = __l->_M_data + __start;
771  __result = _S_new_RopeLeaf(__section, __result_len,
772  __base->_M_get_allocator());
773  __result->_M_c_string = 0; // Not eos terminated.
774 #else
775  // We should sometimes create substring node instead.
776  __result = __STL_ROPE_FROM_UNOWNED_CHAR_PTR(__l->_M_data + __start,
777  __result_len,
778  __base->
779  _M_get_allocator());
780 #endif
781  return __result;
782  }
783  case __detail::_S_substringfn:
784  // Avoid introducing multiple layers of substring nodes.
785  {
786  _RopeSubstring* __old = (_RopeSubstring*)__base;
787  size_t __result_len;
788  if (__start >= __adj_endp1)
789  return 0;
790  __result_len = __adj_endp1 - __start;
791  if (__result_len > __lazy_threshold)
792  {
793  _RopeSubstring* __result =
794  _S_new_RopeSubstring(__old->_M_base,
795  __start + __old->_M_start,
796  __adj_endp1 - __start,
797  __base->_M_get_allocator());
798  return __result;
799 
800  } // *** else fall through: ***
801  }
802  case __detail::_S_function:
803  {
804  _RopeFunction* __f = (_RopeFunction*)__base;
805  _CharT* __section;
806  size_t __result_len;
807  if (__start >= __adj_endp1)
808  return 0;
809  __result_len = __adj_endp1 - __start;
810 
811  if (__result_len > __lazy_threshold)
812  goto lazy;
813  __section = (_CharT*)
814  rope::_Data_allocate(_S_rounded_up_size(__result_len));
815  __try
816  { (*(__f->_M_fn))(__start, __result_len, __section); }
817  __catch(...)
818  {
819  _RopeRep::__STL_FREE_STRING(__section, __result_len,
820  __base->_M_get_allocator());
821  __throw_exception_again;
822  }
823  _S_cond_store_eos(__section[__result_len]);
824  return _S_new_RopeLeaf(__section, __result_len,
825  __base->_M_get_allocator());
826  }
827  }
828  lazy:
829  {
830  // Create substring node.
831  return _S_new_RopeSubstring(__base, __start, __adj_endp1 - __start,
832  __base->_M_get_allocator());
833  }
834  }
835 
836  template<class _CharT>
837  class _Rope_flatten_char_consumer
838  : public _Rope_char_consumer<_CharT>
839  {
840  private:
841  _CharT* _M_buf_ptr;
842  public:
843 
844  _Rope_flatten_char_consumer(_CharT* __buffer)
845  { _M_buf_ptr = __buffer; };
846 
847  ~_Rope_flatten_char_consumer() {}
848 
849  bool
850  operator()(const _CharT* __leaf, size_t __n)
851  {
852  uninitialized_copy_n(__leaf, __n, _M_buf_ptr);
853  _M_buf_ptr += __n;
854  return true;
855  }
856  };
857 
858  template<class _CharT>
859  class _Rope_find_char_char_consumer
860  : public _Rope_char_consumer<_CharT>
861  {
862  private:
863  _CharT _M_pattern;
864  public:
865  size_t _M_count; // Number of nonmatching characters
866 
867  _Rope_find_char_char_consumer(_CharT __p)
868  : _M_pattern(__p), _M_count(0) {}
869 
870  ~_Rope_find_char_char_consumer() {}
871 
872  bool
873  operator()(const _CharT* __leaf, size_t __n)
874  {
875  size_t __i;
876  for (__i = 0; __i < __n; __i++)
877  {
878  if (__leaf[__i] == _M_pattern)
879  {
880  _M_count += __i;
881  return false;
882  }
883  }
884  _M_count += __n; return true;
885  }
886  };
887 
888  template<class _CharT, class _Traits>
889  // Here _CharT is both the stream and rope character type.
890  class _Rope_insert_char_consumer
891  : public _Rope_char_consumer<_CharT>
892  {
893  private:
894  typedef basic_ostream<_CharT,_Traits> _Insert_ostream;
895  _Insert_ostream& _M_o;
896  public:
897  _Rope_insert_char_consumer(_Insert_ostream& __writer)
898  : _M_o(__writer) {};
899  ~_Rope_insert_char_consumer() { };
900  // Caller is presumed to own the ostream
901  bool operator() (const _CharT* __leaf, size_t __n);
902  // Returns true to continue traversal.
903  };
904 
905  template<class _CharT, class _Traits>
906  bool
907  _Rope_insert_char_consumer<_CharT, _Traits>::
908  operator()(const _CharT* __leaf, size_t __n)
909  {
910  size_t __i;
911  // We assume that formatting is set up correctly for each element.
912  for (__i = 0; __i < __n; __i++)
913  _M_o.put(__leaf[__i]);
914  return true;
915  }
916 
917  template <class _CharT, class _Alloc>
918  bool
919  rope<_CharT, _Alloc>::
920  _S_apply_to_pieces(_Rope_char_consumer<_CharT>& __c,
921  const _RopeRep* __r, size_t __begin, size_t __end)
922  {
923  if (0 == __r)
924  return true;
925  switch(__r->_M_tag)
926  {
927  case __detail::_S_concat:
928  {
929  _RopeConcatenation* __conc = (_RopeConcatenation*)__r;
930  _RopeRep* __left = __conc->_M_left;
931  size_t __left_len = __left->_M_size;
932  if (__begin < __left_len)
933  {
934  size_t __left_end = std::min(__left_len, __end);
935  if (!_S_apply_to_pieces(__c, __left, __begin, __left_end))
936  return false;
937  }
938  if (__end > __left_len)
939  {
940  _RopeRep* __right = __conc->_M_right;
941  size_t __right_start = std::max(__left_len, __begin);
942  if (!_S_apply_to_pieces(__c, __right,
943  __right_start - __left_len,
944  __end - __left_len))
945  return false;
946  }
947  }
948  return true;
949  case __detail::_S_leaf:
950  {
951  _RopeLeaf* __l = (_RopeLeaf*)__r;
952  return __c(__l->_M_data + __begin, __end - __begin);
953  }
954  case __detail::_S_function:
955  case __detail::_S_substringfn:
956  {
957  _RopeFunction* __f = (_RopeFunction*)__r;
958  size_t __len = __end - __begin;
959  bool __result;
960  _CharT* __buffer =
961  (_CharT*)_Alloc().allocate(__len * sizeof(_CharT));
962  __try
963  {
964  (*(__f->_M_fn))(__begin, __len, __buffer);
965  __result = __c(__buffer, __len);
966  _Alloc().deallocate(__buffer, __len * sizeof(_CharT));
967  }
968  __catch(...)
969  {
970  _Alloc().deallocate(__buffer, __len * sizeof(_CharT));
971  __throw_exception_again;
972  }
973  return __result;
974  }
975  default:
976  return false;
977  }
978  }
979 
980  template<class _CharT, class _Traits>
981  inline void
982  _Rope_fill(basic_ostream<_CharT, _Traits>& __o, size_t __n)
983  {
984  char __f = __o.fill();
985  size_t __i;
986 
987  for (__i = 0; __i < __n; __i++)
988  __o.put(__f);
989  }
990 
991 
992  template <class _CharT>
993  inline bool
994  _Rope_is_simple(_CharT*)
995  { return false; }
996 
997  inline bool
998  _Rope_is_simple(char*)
999  { return true; }
1000 
1001  inline bool
1002  _Rope_is_simple(wchar_t*)
1003  { return true; }
1004 
1005  template<class _CharT, class _Traits, class _Alloc>
1006  basic_ostream<_CharT, _Traits>&
1007  operator<<(basic_ostream<_CharT, _Traits>& __o,
1008  const rope<_CharT, _Alloc>& __r)
1009  {
1010  size_t __w = __o.width();
1011  bool __left = bool(__o.flags() & std::ios::left);
1012  size_t __pad_len;
1013  size_t __rope_len = __r.size();
1014  _Rope_insert_char_consumer<_CharT, _Traits> __c(__o);
1015  bool __is_simple = _Rope_is_simple((_CharT*)0);
1016 
1017  if (__rope_len < __w)
1018  __pad_len = __w - __rope_len;
1019  else
1020  __pad_len = 0;
1021 
1022  if (!__is_simple)
1023  __o.width(__w / __rope_len);
1024  __try
1025  {
1026  if (__is_simple && !__left && __pad_len > 0)
1027  _Rope_fill(__o, __pad_len);
1028  __r.apply_to_pieces(0, __r.size(), __c);
1029  if (__is_simple && __left && __pad_len > 0)
1030  _Rope_fill(__o, __pad_len);
1031  if (!__is_simple)
1032  __o.width(__w);
1033  }
1034  __catch(...)
1035  {
1036  if (!__is_simple)
1037  __o.width(__w);
1038  __throw_exception_again;
1039  }
1040  return __o;
1041  }
1042 
1043  template <class _CharT, class _Alloc>
1044  _CharT*
1045  rope<_CharT, _Alloc>::
1046  _S_flatten(_RopeRep* __r, size_t __start, size_t __len,
1047  _CharT* __buffer)
1048  {
1049  _Rope_flatten_char_consumer<_CharT> __c(__buffer);
1050  _S_apply_to_pieces(__c, __r, __start, __start + __len);
1051  return(__buffer + __len);
1052  }
1053 
1054  template <class _CharT, class _Alloc>
1055  size_t
1056  rope<_CharT, _Alloc>::
1057  find(_CharT __pattern, size_t __start) const
1058  {
1059  _Rope_find_char_char_consumer<_CharT> __c(__pattern);
1060  _S_apply_to_pieces(__c, this->_M_tree_ptr, __start, size());
1061  size_type __result_pos = __start + __c._M_count;
1062 #ifndef __STL_OLD_ROPE_SEMANTICS
1063  if (__result_pos == size())
1064  __result_pos = npos;
1065 #endif
1066  return __result_pos;
1067  }
1068 
1069  template <class _CharT, class _Alloc>
1070  _CharT*
1071  rope<_CharT, _Alloc>::
1072  _S_flatten(_RopeRep* __r, _CharT* __buffer)
1073  {
1074  if (0 == __r)
1075  return __buffer;
1076  switch(__r->_M_tag)
1077  {
1078  case __detail::_S_concat:
1079  {
1080  _RopeConcatenation* __c = (_RopeConcatenation*)__r;
1081  _RopeRep* __left = __c->_M_left;
1082  _RopeRep* __right = __c->_M_right;
1083  _CharT* __rest = _S_flatten(__left, __buffer);
1084  return _S_flatten(__right, __rest);
1085  }
1086  case __detail::_S_leaf:
1087  {
1088  _RopeLeaf* __l = (_RopeLeaf*)__r;
1089  return copy_n(__l->_M_data, __l->_M_size, __buffer).second;
1090  }
1091  case __detail::_S_function:
1092  case __detail::_S_substringfn:
1093  // We don't yet do anything with substring nodes.
1094  // This needs to be fixed before ropefiles will work well.
1095  {
1096  _RopeFunction* __f = (_RopeFunction*)__r;
1097  (*(__f->_M_fn))(0, __f->_M_size, __buffer);
1098  return __buffer + __f->_M_size;
1099  }
1100  default:
1101  return 0;
1102  }
1103  }
1104 
1105  // This needs work for _CharT != char
1106  template <class _CharT, class _Alloc>
1107  void
1108  rope<_CharT, _Alloc>::
1109  _S_dump(_RopeRep* __r, int __indent)
1110  {
1111  for (int __i = 0; __i < __indent; __i++)
1112  putchar(' ');
1113  if (0 == __r)
1114  {
1115  printf("NULL\n");
1116  return;
1117  }
1118  if (_S_concat == __r->_M_tag)
1119  {
1120  _RopeConcatenation* __c = (_RopeConcatenation*)__r;
1121  _RopeRep* __left = __c->_M_left;
1122  _RopeRep* __right = __c->_M_right;
1123 
1124 #ifdef __GC
1125  printf("Concatenation %p (depth = %d, len = %ld, %s balanced)\n",
1126  __r, __r->_M_depth, __r->_M_size,
1127  __r->_M_is_balanced? "" : "not");
1128 #else
1129  printf("Concatenation %p (rc = %ld, depth = %d, "
1130  "len = %ld, %s balanced)\n",
1131  __r, __r->_M_ref_count, __r->_M_depth, __r->_M_size,
1132  __r->_M_is_balanced? "" : "not");
1133 #endif
1134  _S_dump(__left, __indent + 2);
1135  _S_dump(__right, __indent + 2);
1136  return;
1137  }
1138  else
1139  {
1140  char* __kind;
1141 
1142  switch (__r->_M_tag)
1143  {
1144  case __detail::_S_leaf:
1145  __kind = "Leaf";
1146  break;
1147  case __detail::_S_function:
1148  __kind = "Function";
1149  break;
1150  case __detail::_S_substringfn:
1151  __kind = "Function representing substring";
1152  break;
1153  default:
1154  __kind = "(corrupted kind field!)";
1155  }
1156 #ifdef __GC
1157  printf("%s %p (depth = %d, len = %ld) ",
1158  __kind, __r, __r->_M_depth, __r->_M_size);
1159 #else
1160  printf("%s %p (rc = %ld, depth = %d, len = %ld) ",
1161  __kind, __r, __r->_M_ref_count, __r->_M_depth, __r->_M_size);
1162 #endif
1163  if (_S_is_one_byte_char_type((_CharT*)0))
1164  {
1165  const int __max_len = 40;
1166  _Self_destruct_ptr __prefix(_S_substring(__r, 0, __max_len));
1167  _CharT __buffer[__max_len + 1];
1168  bool __too_big = __r->_M_size > __prefix->_M_size;
1169 
1170  _S_flatten(__prefix, __buffer);
1171  __buffer[__prefix->_M_size] = _S_eos((_CharT*)0);
1172  printf("%s%s\n", (char*)__buffer,
1173  __too_big? "...\n" : "\n");
1174  }
1175  else
1176  printf("\n");
1177  }
1178  }
1179 
1180  template <class _CharT, class _Alloc>
1181  const unsigned long
1182  rope<_CharT, _Alloc>::
1183  _S_min_len[int(__detail::_S_max_rope_depth) + 1] = {
1184  /* 0 */1, /* 1 */2, /* 2 */3, /* 3 */5, /* 4 */8, /* 5 */13, /* 6 */21,
1185  /* 7 */34, /* 8 */55, /* 9 */89, /* 10 */144, /* 11 */233, /* 12 */377,
1186  /* 13 */610, /* 14 */987, /* 15 */1597, /* 16 */2584, /* 17 */4181,
1187  /* 18 */6765, /* 19 */10946, /* 20 */17711, /* 21 */28657, /* 22 */46368,
1188  /* 23 */75025, /* 24 */121393, /* 25 */196418, /* 26 */317811,
1189  /* 27 */514229, /* 28 */832040, /* 29 */1346269, /* 30 */2178309,
1190  /* 31 */3524578, /* 32 */5702887, /* 33 */9227465, /* 34 */14930352,
1191  /* 35 */24157817, /* 36 */39088169, /* 37 */63245986, /* 38 */102334155,
1192  /* 39 */165580141, /* 40 */267914296, /* 41 */433494437,
1193  /* 42 */701408733, /* 43 */1134903170, /* 44 */1836311903,
1194  /* 45 */2971215073u };
1195  // These are Fibonacci numbers < 2**32.
1196 
1197  template <class _CharT, class _Alloc>
1198  typename rope<_CharT, _Alloc>::_RopeRep*
1199  rope<_CharT, _Alloc>::
1200  _S_balance(_RopeRep* __r)
1201  {
1202  _RopeRep* __forest[int(__detail::_S_max_rope_depth) + 1];
1203  _RopeRep* __result = 0;
1204  int __i;
1205  // Invariant:
1206  // The concatenation of forest in descending order is equal to __r.
1207  // __forest[__i]._M_size >= _S_min_len[__i]
1208  // __forest[__i]._M_depth = __i
1209  // References from forest are included in refcount.
1210 
1211  for (__i = 0; __i <= int(__detail::_S_max_rope_depth); ++__i)
1212  __forest[__i] = 0;
1213  __try
1214  {
1215  _S_add_to_forest(__r, __forest);
1216  for (__i = 0; __i <= int(__detail::_S_max_rope_depth); ++__i)
1217  if (0 != __forest[__i])
1218  {
1219 #ifndef __GC
1220  _Self_destruct_ptr __old(__result);
1221 #endif
1222  __result = _S_concat(__forest[__i], __result);
1223  __forest[__i]->_M_unref_nonnil();
1224 #if !defined(__GC) && __cpp_exceptions
1225  __forest[__i] = 0;
1226 #endif
1227  }
1228  }
1229  __catch(...)
1230  {
1231  for(__i = 0; __i <= int(__detail::_S_max_rope_depth); __i++)
1232  _S_unref(__forest[__i]);
1233  __throw_exception_again;
1234  }
1235 
1236  if (__result->_M_depth > int(__detail::_S_max_rope_depth))
1237  __throw_length_error(__N("rope::_S_balance"));
1238  return(__result);
1239  }
1240 
1241  template <class _CharT, class _Alloc>
1242  void
1243  rope<_CharT, _Alloc>::
1244  _S_add_to_forest(_RopeRep* __r, _RopeRep** __forest)
1245  {
1246  if (__r->_M_is_balanced)
1247  {
1248  _S_add_leaf_to_forest(__r, __forest);
1249  return;
1250  }
1251 
1252  {
1253  _RopeConcatenation* __c = (_RopeConcatenation*)__r;
1254 
1255  _S_add_to_forest(__c->_M_left, __forest);
1256  _S_add_to_forest(__c->_M_right, __forest);
1257  }
1258  }
1259 
1260 
1261  template <class _CharT, class _Alloc>
1262  void
1263  rope<_CharT, _Alloc>::
1264  _S_add_leaf_to_forest(_RopeRep* __r, _RopeRep** __forest)
1265  {
1266  _RopeRep* __insertee; // included in refcount
1267  _RopeRep* __too_tiny = 0; // included in refcount
1268  int __i; // forest[0..__i-1] is empty
1269  size_t __s = __r->_M_size;
1270 
1271  for (__i = 0; __s >= _S_min_len[__i+1]/* not this bucket */; ++__i)
1272  {
1273  if (0 != __forest[__i])
1274  {
1275 #ifndef __GC
1276  _Self_destruct_ptr __old(__too_tiny);
1277 #endif
1278  __too_tiny = _S_concat_and_set_balanced(__forest[__i],
1279  __too_tiny);
1280  __forest[__i]->_M_unref_nonnil();
1281  __forest[__i] = 0;
1282  }
1283  }
1284  {
1285 #ifndef __GC
1286  _Self_destruct_ptr __old(__too_tiny);
1287 #endif
1288  __insertee = _S_concat_and_set_balanced(__too_tiny, __r);
1289  }
1290  // Too_tiny dead, and no longer included in refcount.
1291  // Insertee is live and included.
1292  for (;; ++__i)
1293  {
1294  if (0 != __forest[__i])
1295  {
1296 #ifndef __GC
1297  _Self_destruct_ptr __old(__insertee);
1298 #endif
1299  __insertee = _S_concat_and_set_balanced(__forest[__i],
1300  __insertee);
1301  __forest[__i]->_M_unref_nonnil();
1302  __forest[__i] = 0;
1303  }
1304  if (__i == int(__detail::_S_max_rope_depth)
1305  || __insertee->_M_size < _S_min_len[__i+1])
1306  {
1307  __forest[__i] = __insertee;
1308  // refcount is OK since __insertee is now dead.
1309  return;
1310  }
1311  }
1312  }
1313 
1314  template <class _CharT, class _Alloc>
1315  _CharT
1316  rope<_CharT, _Alloc>::
1317  _S_fetch(_RopeRep* __r, size_type __i)
1318  {
1319  __GC_CONST _CharT* __cstr = __r->_M_c_string;
1320 
1321  if (0 != __cstr)
1322  return __cstr[__i];
1323  for(;;)
1324  {
1325  switch(__r->_M_tag)
1326  {
1327  case __detail::_S_concat:
1328  {
1329  _RopeConcatenation* __c = (_RopeConcatenation*)__r;
1330  _RopeRep* __left = __c->_M_left;
1331  size_t __left_len = __left->_M_size;
1332 
1333  if (__i >= __left_len)
1334  {
1335  __i -= __left_len;
1336  __r = __c->_M_right;
1337  }
1338  else
1339  __r = __left;
1340  }
1341  break;
1342  case __detail::_S_leaf:
1343  {
1344  _RopeLeaf* __l = (_RopeLeaf*)__r;
1345  return __l->_M_data[__i];
1346  }
1347  case __detail::_S_function:
1348  case __detail::_S_substringfn:
1349  {
1350  _RopeFunction* __f = (_RopeFunction*)__r;
1351  _CharT __result;
1352 
1353  (*(__f->_M_fn))(__i, 1, &__result);
1354  return __result;
1355  }
1356  }
1357  }
1358  }
1359 
1360 #ifndef __GC
1361  // Return a uniquely referenced character slot for the given
1362  // position, or 0 if that's not possible.
1363  template <class _CharT, class _Alloc>
1364  _CharT*
1365  rope<_CharT, _Alloc>::
1366  _S_fetch_ptr(_RopeRep* __r, size_type __i)
1367  {
1368  _RopeRep* __clrstack[__detail::_S_max_rope_depth];
1369  size_t __csptr = 0;
1370 
1371  for(;;)
1372  {
1373  if (__r->_M_ref_count > 1)
1374  return 0;
1375  switch(__r->_M_tag)
1376  {
1377  case __detail::_S_concat:
1378  {
1379  _RopeConcatenation* __c = (_RopeConcatenation*)__r;
1380  _RopeRep* __left = __c->_M_left;
1381  size_t __left_len = __left->_M_size;
1382 
1383  if (__c->_M_c_string != 0)
1384  __clrstack[__csptr++] = __c;
1385  if (__i >= __left_len)
1386  {
1387  __i -= __left_len;
1388  __r = __c->_M_right;
1389  }
1390  else
1391  __r = __left;
1392  }
1393  break;
1394  case __detail::_S_leaf:
1395  {
1396  _RopeLeaf* __l = (_RopeLeaf*)__r;
1397  if (__l->_M_c_string != __l->_M_data && __l->_M_c_string != 0)
1398  __clrstack[__csptr++] = __l;
1399  while (__csptr > 0)
1400  {
1401  -- __csptr;
1402  _RopeRep* __d = __clrstack[__csptr];
1403  __d->_M_free_c_string();
1404  __d->_M_c_string = 0;
1405  }
1406  return __l->_M_data + __i;
1407  }
1408  case __detail::_S_function:
1409  case __detail::_S_substringfn:
1410  return 0;
1411  }
1412  }
1413  }
1414 #endif /* __GC */
1415 
1416  // The following could be implemented trivially using
1417  // lexicographical_compare_3way.
1418  // We do a little more work to avoid dealing with rope iterators for
1419  // flat strings.
1420  template <class _CharT, class _Alloc>
1421  int
1422  rope<_CharT, _Alloc>::
1423  _S_compare (const _RopeRep* __left, const _RopeRep* __right)
1424  {
1425  size_t __left_len;
1426  size_t __right_len;
1427 
1428  if (0 == __right)
1429  return 0 != __left;
1430  if (0 == __left)
1431  return -1;
1432  __left_len = __left->_M_size;
1433  __right_len = __right->_M_size;
1434  if (__detail::_S_leaf == __left->_M_tag)
1435  {
1436  _RopeLeaf* __l = (_RopeLeaf*) __left;
1437  if (__detail::_S_leaf == __right->_M_tag)
1438  {
1439  _RopeLeaf* __r = (_RopeLeaf*) __right;
1440  return lexicographical_compare_3way(__l->_M_data,
1441  __l->_M_data + __left_len,
1442  __r->_M_data, __r->_M_data
1443  + __right_len);
1444  }
1445  else
1446  {
1447  const_iterator __rstart(__right, 0);
1448  const_iterator __rend(__right, __right_len);
1449  return lexicographical_compare_3way(__l->_M_data, __l->_M_data
1450  + __left_len,
1451  __rstart, __rend);
1452  }
1453  }
1454  else
1455  {
1456  const_iterator __lstart(__left, 0);
1457  const_iterator __lend(__left, __left_len);
1458  if (__detail::_S_leaf == __right->_M_tag)
1459  {
1460  _RopeLeaf* __r = (_RopeLeaf*) __right;
1461  return lexicographical_compare_3way(__lstart, __lend,
1462  __r->_M_data, __r->_M_data
1463  + __right_len);
1464  }
1465  else
1466  {
1467  const_iterator __rstart(__right, 0);
1468  const_iterator __rend(__right, __right_len);
1469  return lexicographical_compare_3way(__lstart, __lend,
1470  __rstart, __rend);
1471  }
1472  }
1473  }
1474 
1475  // Assignment to reference proxies.
1476  template <class _CharT, class _Alloc>
1477  _Rope_char_ref_proxy<_CharT, _Alloc>&
1478  _Rope_char_ref_proxy<_CharT, _Alloc>::
1479  operator=(_CharT __c)
1480  {
1481  _RopeRep* __old = _M_root->_M_tree_ptr;
1482 #ifndef __GC
1483  // First check for the case in which everything is uniquely
1484  // referenced. In that case we can do this destructively.
1485  _CharT* __ptr = _My_rope::_S_fetch_ptr(__old, _M_pos);
1486  if (0 != __ptr)
1487  {
1488  *__ptr = __c;
1489  return *this;
1490  }
1491 #endif
1492  _Self_destruct_ptr __left(_My_rope::_S_substring(__old, 0, _M_pos));
1493  _Self_destruct_ptr __right(_My_rope::_S_substring(__old, _M_pos + 1,
1494  __old->_M_size));
1495  _Self_destruct_ptr __result_left(_My_rope::
1496  _S_destr_concat_char_iter(__left,
1497  &__c, 1));
1498 
1499  _RopeRep* __result = _My_rope::_S_concat(__result_left, __right);
1500 #ifndef __GC
1501  _RopeRep::_S_unref(__old);
1502 #endif
1503  _M_root->_M_tree_ptr = __result;
1504  return *this;
1505  }
1506 
1507  template <class _CharT, class _Alloc>
1508  inline _Rope_char_ref_proxy<_CharT, _Alloc>::
1509  operator _CharT() const
1510  {
1511  if (_M_current_valid)
1512  return _M_current;
1513  else
1514  return _My_rope::_S_fetch(_M_root->_M_tree_ptr, _M_pos);
1515  }
1516 
1517  template <class _CharT, class _Alloc>
1518  _Rope_char_ptr_proxy<_CharT, _Alloc>
1519  _Rope_char_ref_proxy<_CharT, _Alloc>::
1520  operator&() const
1521  { return _Rope_char_ptr_proxy<_CharT, _Alloc>(*this); }
1522 
1523  template <class _CharT, class _Alloc>
1524  rope<_CharT, _Alloc>::
1525  rope(size_t __n, _CharT __c, const allocator_type& __a)
1526  : _Base(__a)
1527  {
1528  rope<_CharT,_Alloc> __result;
1529  const size_t __exponentiate_threshold = 32;
1530  size_t __exponent;
1531  size_t __rest;
1532  _CharT* __rest_buffer;
1533  _RopeRep* __remainder;
1534  rope<_CharT, _Alloc> __remainder_rope;
1535 
1536  if (0 == __n)
1537  return;
1538 
1539  __exponent = __n / __exponentiate_threshold;
1540  __rest = __n % __exponentiate_threshold;
1541  if (0 == __rest)
1542  __remainder = 0;
1543  else
1544  {
1545  __rest_buffer = this->_Data_allocate(_S_rounded_up_size(__rest));
1546  __uninitialized_fill_n_a(__rest_buffer, __rest, __c,
1547  _M_get_allocator());
1548  _S_cond_store_eos(__rest_buffer[__rest]);
1549  __try
1550  { __remainder = _S_new_RopeLeaf(__rest_buffer, __rest,
1551  _M_get_allocator()); }
1552  __catch(...)
1553  {
1554  _RopeRep::__STL_FREE_STRING(__rest_buffer, __rest,
1555  _M_get_allocator());
1556  __throw_exception_again;
1557  }
1558  }
1559  __remainder_rope._M_tree_ptr = __remainder;
1560  if (__exponent != 0)
1561  {
1562  _CharT* __base_buffer =
1563  this->_Data_allocate(_S_rounded_up_size(__exponentiate_threshold));
1564  _RopeLeaf* __base_leaf;
1565  rope __base_rope;
1566  __uninitialized_fill_n_a(__base_buffer, __exponentiate_threshold, __c,
1567  _M_get_allocator());
1568  _S_cond_store_eos(__base_buffer[__exponentiate_threshold]);
1569  __try
1570  {
1571  __base_leaf = _S_new_RopeLeaf(__base_buffer,
1572  __exponentiate_threshold,
1573  _M_get_allocator());
1574  }
1575  __catch(...)
1576  {
1577  _RopeRep::__STL_FREE_STRING(__base_buffer,
1578  __exponentiate_threshold,
1579  _M_get_allocator());
1580  __throw_exception_again;
1581  }
1582  __base_rope._M_tree_ptr = __base_leaf;
1583  if (1 == __exponent)
1584  __result = __base_rope;
1585  else
1586  __result = power(__base_rope, __exponent,
1587  _Rope_Concat_fn<_CharT, _Alloc>());
1588 
1589  if (0 != __remainder)
1590  __result += __remainder_rope;
1591  }
1592  else
1593  __result = __remainder_rope;
1594 
1595  this->_M_tree_ptr = __result._M_tree_ptr;
1596  this->_M_tree_ptr->_M_ref_nonnil();
1597  }
1598 
1599  template<class _CharT, class _Alloc>
1600  _CharT
1601  rope<_CharT, _Alloc>::_S_empty_c_str[1];
1602 
1603  template<class _CharT, class _Alloc>
1604  const _CharT*
1605  rope<_CharT, _Alloc>::
1606  c_str() const
1607  {
1608  if (0 == this->_M_tree_ptr)
1609  {
1610  _S_empty_c_str[0] = _S_eos((_CharT*)0); // Possibly redundant,
1611  // but probably fast.
1612  return _S_empty_c_str;
1613  }
1614  __gthread_mutex_lock (&this->_M_tree_ptr->_M_c_string_lock);
1615  __GC_CONST _CharT* __result = this->_M_tree_ptr->_M_c_string;
1616  if (0 == __result)
1617  {
1618  size_t __s = size();
1619  __result = this->_Data_allocate(__s + 1);
1620  _S_flatten(this->_M_tree_ptr, __result);
1621  __result[__s] = _S_eos((_CharT*)0);
1622  this->_M_tree_ptr->_M_c_string = __result;
1623  }
1624  __gthread_mutex_unlock (&this->_M_tree_ptr->_M_c_string_lock);
1625  return(__result);
1626  }
1627 
1628  template<class _CharT, class _Alloc>
1629  const _CharT* rope<_CharT, _Alloc>::
1630  replace_with_c_str()
1631  {
1632  if (0 == this->_M_tree_ptr)
1633  {
1634  _S_empty_c_str[0] = _S_eos((_CharT*)0);
1635  return _S_empty_c_str;
1636  }
1637  __GC_CONST _CharT* __old_c_string = this->_M_tree_ptr->_M_c_string;
1638  if (__detail::_S_leaf == this->_M_tree_ptr->_M_tag
1639  && 0 != __old_c_string)
1640  return(__old_c_string);
1641  size_t __s = size();
1642  _CharT* __result = this->_Data_allocate(_S_rounded_up_size(__s));
1643  _S_flatten(this->_M_tree_ptr, __result);
1644  __result[__s] = _S_eos((_CharT*)0);
1645  this->_M_tree_ptr->_M_unref_nonnil();
1646  this->_M_tree_ptr = _S_new_RopeLeaf(__result, __s,
1647  this->_M_get_allocator());
1648  return(__result);
1649  }
1650 
1651  // Algorithm specializations. More should be added.
1652 
1653  template<class _Rope_iterator> // was templated on CharT and Alloc
1654  void // VC++ workaround
1655  _Rope_rotate(_Rope_iterator __first,
1656  _Rope_iterator __middle,
1657  _Rope_iterator __last)
1658  {
1659  typedef typename _Rope_iterator::value_type _CharT;
1660  typedef typename _Rope_iterator::_allocator_type _Alloc;
1661 
1662  rope<_CharT, _Alloc>& __r(__first.container());
1663  rope<_CharT, _Alloc> __prefix = __r.substr(0, __first.index());
1664  rope<_CharT, _Alloc> __suffix =
1665  __r.substr(__last.index(), __r.size() - __last.index());
1666  rope<_CharT, _Alloc> __part1 =
1667  __r.substr(__middle.index(), __last.index() - __middle.index());
1668  rope<_CharT, _Alloc> __part2 =
1669  __r.substr(__first.index(), __middle.index() - __first.index());
1670  __r = __prefix;
1671  __r += __part1;
1672  __r += __part2;
1673  __r += __suffix;
1674  }
1675 
1676 #if !defined(__GNUC__)
1677  // Appears to confuse g++
1678  inline void
1679  rotate(_Rope_iterator<char, __STL_DEFAULT_ALLOCATOR(char)> __first,
1680  _Rope_iterator<char, __STL_DEFAULT_ALLOCATOR(char)> __middle,
1681  _Rope_iterator<char, __STL_DEFAULT_ALLOCATOR(char)> __last)
1682  { _Rope_rotate(__first, __middle, __last); }
1683 #endif
1684 
1685 # if 0
1686  // Probably not useful for several reasons:
1687  // - for SGIs 7.1 compiler and probably some others,
1688  // this forces lots of rope<wchar_t, ...> instantiations, creating a
1689  // code bloat and compile time problem. (Fixed in 7.2.)
1690  // - wchar_t is 4 bytes wide on most UNIX platforms, making it
1691  // unattractive for unicode strings. Unsigned short may be a better
1692  // character type.
1693  inline void
1694  rotate(_Rope_iterator<wchar_t, __STL_DEFAULT_ALLOCATOR(char)> __first,
1695  _Rope_iterator<wchar_t, __STL_DEFAULT_ALLOCATOR(char)> __middle,
1696  _Rope_iterator<wchar_t, __STL_DEFAULT_ALLOCATOR(char)> __last)
1697  { _Rope_rotate(__first, __middle, __last); }
1698 # endif
1699 
1700 _GLIBCXX_END_NAMESPACE_VERSION
1701 } // namespace
1702 
std::ios_base::left
static const fmtflags left
Adds fill characters on the right (final positions) of certain generated output. (I.e., the thing you print is flush left.)
Definition: ios_base.h:344
__gnu_cxx
GNU extensions for public use.
std::operator&
bitset< _Nb > operator&(const bitset< _Nb > &__x, const bitset< _Nb > &__y) noexcept
Global bitwise operations on bitsets.
Definition: bitset:1425
std::uninitialized_copy_n
_ForwardIterator uninitialized_copy_n(_InputIterator __first, _Size __n, _ForwardIterator __result)
Copies the range [first,first+n) into result.
Definition: stl_uninitialized.h:679
std::basic_ostream
Template class basic_ostream.
Definition: iosfwd:86
std::_Destroy
void _Destroy(_Tp *__pointer)
Definition: stl_construct.h:92
std::min
_GLIBCXX14_CONSTEXPR const _Tp & min(const _Tp &, const _Tp &)
This does what you think it does.
Definition: stl_algobase.h:195
std::max
_GLIBCXX14_CONSTEXPR const _Tp & max(const _Tp &, const _Tp &)
This does what you think it does.
Definition: stl_algobase.h:219
__gnu_cxx::lexicographical_compare_3way
int lexicographical_compare_3way(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _InputIterator2 __last2)
memcmp on steroids.
Definition: ext/algorithm:201
__gnu_debug::__base
_Siter_base< _Iterator >::iterator_type __base(_Iterator __it)
Definition: functions.h:558
__gnu_cxx::power
_Tp power(_Tp __x, _Integer __n, _MonoidOperation __monoid_op)
Definition: ext/numeric:113