src/changes.C

   1 /**
   2  * \file changes.C
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author John Levon
   7  * \author Michael Gerz
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  *
  11  * Record changes in a paragraph.
  12  */
  13
  14 #include <config.h>
  15
  16 #include "changes.h"
  17 #include "debug.h"
  18
  19 #include <boost/assert.hpp>
  20
  21
  22 namespace lyx {
  23
  24 using std::endl;
  25 using std::string;
  26
  27
  28 bool operator==(Change const & l, Change const & r)
  29 {
  30         return l.type == r.type && l.author == r.author
  31                 && l.changetime == r.changetime;
  32 }
  33
  34
  35 bool operator!=(Change const & l, Change const & r)
  36 {
  37         return !(l == r);
  38 }
  39
  40
  41 bool operator==(Changes::Range const & r1, Changes::Range const & r2)
  42 {
  43         return r1.start == r2.start && r1.end == r2.end;
  44 }
  45
  46
  47 bool operator!=(Changes::Range const & r1, Changes::Range const & r2)
  48 {
  49         return !(r1 == r2);
  50 }
  51
  52
  53 bool Changes::Range::contains(Range const & r) const
  54 {
  55         return r.start >= start && r.end <= end;
  56 }
  57
  58
  59 bool Changes::Range::contains(pos_type const pos) const
  60 {
  61         return pos >= start && pos < end;
  62 }
  63
  64
  65 bool Changes::Range::intersects(Range const & r) const
  66 {
  67         return r.start < end && r.end > start; // end itself is not in the range!
  68 }
  69
  70
  71 void Changes::set(Change const & change, pos_type const pos)
  72 {
  73         set(change, pos, pos + 1);
  74 }
  75
  76
  77 void Changes::set(Change const & change, pos_type const start, pos_type const end)
  78 {
  79         if (lyxerr.debugging(Debug::CHANGES)) {
  80                 lyxerr[Debug::CHANGES] << "setting change (type: " << change.type
  81                         << ", author: " << change.author << ", time: " << change.changetime
  82                         << ") in range (" << start << ", " << end << ")" << endl;
  83         }
  84
  85         Range const newRange(start, end);
  86
  87         ChangeTable::iterator it = table_.begin();
  88
  89         for (; it != table_.end(); ) {
  90                 // find super change, check for equal types, and do nothing
  91                 if (it->range.contains(newRange) && it->change.type == change.type) {
  92                         return;
  93                 }
  94
  95                 // current change starts like or follows new change
  96                 if (it->range.start >= start) {
  97                         break;
  98                 }
  99
 100                 // new change intersects with existing change
 101                 if (it->range.end > start) {
 102                         pos_type oldEnd = it->range.end;
 103                         it->range.end = start;
 104                         if (lyxerr.debugging(Debug::CHANGES)) {
 105                                 lyxerr[Debug::CHANGES] << "  cutting tail of type " << it->change.type
 106                                         << " resulting in range (" << it->range.start << ", "
 107                                         << it->range.end << ")" << endl;
 108                         }
 109                         ++it;
 110                         if (oldEnd >= end) {
 111                                 if (lyxerr.debugging(Debug::CHANGES)) {
 112                                         lyxerr[Debug::CHANGES] << "  inserting tail in range ("
 113                                                 << end << ", " << oldEnd << ")" << endl;
 114                                 }
 115                                 it = table_.insert(it, ChangeRange((it-1)->change, Range(end, oldEnd)));
 116                         }
 117                         continue;
 118                 }
 119
 120                 ++it;
 121         }
 122
 123         if (change.type != Change::UNCHANGED) {
 124                 if (lyxerr.debugging(Debug::CHANGES)) {
 125                         lyxerr[Debug::CHANGES] << "  inserting change" << endl;
 126                 }
 127                 it = table_.insert(it, ChangeRange(change, Range(start, end)));
 128                 ++it;
 129         }
 130
 131         for (; it != table_.end(); ) {
 132                 // new change 'contains' existing change
 133                 if (newRange.contains(it->range)) {
 134                         if (lyxerr.debugging(Debug::CHANGES)) {
 135                                 lyxerr[Debug::CHANGES] << "  removing subrange ("
 136                                         << it->range.start << ", " << it->range.end << ")" << endl;
 137                         }
 138                         it = table_.erase(it);
 139                         continue;
 140                 }
 141
 142                 // new change precedes existing change
 143                 if (it->range.start >= end) {
 144                         break;
 145                 }
 146
 147                 // new change intersects with existing change
 148                 it->range.start = end;
 149                 if (lyxerr.debugging(Debug::CHANGES)) {
 150                         lyxerr[Debug::CHANGES] << "  cutting head of type "
 151                                 << it->change.type << " resulting in range ("
 152                                 << end << ", " << it->range.end << ")" << endl;
 153                 }
 154                 break; // no need for another iteration
 155         }
 156
 157         merge();
 158 }
 159
 160
 161 void Changes::erase(pos_type const pos)
 162 {
 163         if (lyxerr.debugging(Debug::CHANGES)) {
 164                 lyxerr[Debug::CHANGES] << "Erasing change at position " << pos << endl;
 165         }
 166
 167         ChangeTable::iterator it = table_.begin();
 168         ChangeTable::iterator end = table_.end();
 169
 170         for (; it != end; ++it) {
 171                 // range (pos,pos+x) becomes (pos,pos+x-1)
 172                 if (it->range.start > pos) {
 173                         --(it->range.start);
 174                 }
 175                 // range (pos-x,pos) stays (pos-x,pos)
 176                 if (it->range.end > pos) {
 177                         --(it->range.end);
 178                 }
 179         }
 180
 181         merge();
 182 }
 183
 184
 185 void Changes::insert(Change const & change, lyx::pos_type pos)
 186 {
 187         if (lyxerr.debugging(Debug::CHANGES)) {
 188                 lyxerr[Debug::CHANGES] << "Inserting change of type " << change.type
 189                         << " at position " << pos << endl;
 190         }
 191
 192         ChangeTable::iterator it = table_.begin();
 193         ChangeTable::iterator end = table_.end();
 194
 195         for (; it != end; ++it) {
 196                 // range (pos,pos+x) becomes (pos+1,pos+x+1)
 197                 if (it->range.start >= pos) {
 198                         ++(it->range.start);
 199                 }
 200
 201                 // range (pos-x,pos) stays as it is
 202                 if (it->range.end > pos) {
 203                         ++(it->range.end);
 204                 }
 205         }
 206
 207         set(change, pos, pos + 1); // set will call merge
 208 }
 209
 210
 211 Change const Changes::lookup(pos_type const pos) const
 212 {
 213         ChangeTable::const_iterator it = table_.begin();
 214         ChangeTable::const_iterator const end = table_.end();
 215
 216         for (; it != end; ++it) {
 217                 if (it->range.contains(pos))
 218                         return it->change;
 219         }
 220
 221         return Change(Change::UNCHANGED);
 222 }
 223
 224
 225 bool Changes::isChanged(pos_type const start, pos_type const end) const
 226 {
 227         ChangeTable::const_iterator it = table_.begin();
 228         ChangeTable::const_iterator const itend = table_.end();
 229
 230         for (; it != itend; ++it) {
 231                 if (it->range.intersects(Range(start, end))) {
 232                         if (lyxerr.debugging(Debug::CHANGES)) {
 233                                 lyxerr[Debug::CHANGES] << "found intersection of range ("
 234                                         << start << ", " << end << ") with ("
 235                                         << it->range.start << ", " << it->range.end
 236                                         << ") of type " << it->change.type << endl;
 237                         }
 238                         return true;
 239                 }
 240         }
 241         return false;
 242 }
 243
 244
 245 void Changes::merge()
 246 {
 247         if (lyxerr.debugging(Debug::CHANGES)) {
 248                 lyxerr[Debug::CHANGES] << "merging changes..." << endl;
 249         }
 250
 251         ChangeTable::iterator it = table_.begin();
 252
 253         while (it != table_.end()) {
 254                 if (lyxerr.debugging(Debug::CHANGES)) {
 255                         lyxerr[Debug::CHANGES] << "  found change of type " << it->change.type
 256                                 << " and range (" << it->range.start << ", " << it->range.end
 257                                 << ")" << endl;
 258                 }
 259
 260                 if (it->range.start == it->range.end) {
 261                         if (lyxerr.debugging(Debug::CHANGES)) {
 262                                 lyxerr[Debug::CHANGES] << "  removing empty range for pos "
 263                                         << it->range.start << endl;
 264                         }
 265
 266                         table_.erase(it);
 267                         // start again
 268                         it = table_.begin();
 269                         continue;
 270                 }
 271
 272                 if (it + 1 == table_.end())
 273                         break;
 274
 275                 if (it->change == (it + 1)->change && it->range.end == (it + 1)->range.start) {
 276                         if (lyxerr.debugging(Debug::CHANGES)) {
 277                                 lyxerr[Debug::CHANGES] << "  merging ranges (" << it->range.start << ", "
 278                                         << it->range.end << ") and (" << (it + 1)->range.start << ", "
 279                                         << (it + 1)->range.end << ")" << endl;
 280                         }
 281                         (it + 1)->range.start = it->range.start;
 282                         table_.erase(it);
 283                         // start again
 284                         it = table_.begin();
 285                         continue;
 286                 }
 287
 288                 ++it;
 289         }
 290 }
 291
 292
 293 int Changes::latexMarkChange(odocstream & os,
 294                              Change::Type const old, Change::Type const change,
 295                              bool const & output)
 296 {
 297         // FIXME: change tracking (MG)
 298         if (!output || old == change)
 299                 return 0;
 300
 301         static docstring const start(from_ascii("\\changestart{}"));
 302         static docstring const end(from_ascii("\\changeend{}"));
 303         static docstring const son(from_ascii("\\overstrikeon{}"));
 304         static docstring const soff(from_ascii("\\overstrikeoff{}"));
 305
 306         int column = 0;
 307
 308         if (old == Change::DELETED) {
 309                 os << soff;
 310                 column += soff.length();
 311         }
 312
 313         switch (change) {
 314                 case Change::UNCHANGED:
 315                         os << end;
 316                         column += end.length();
 317                         break;
 318
 319                 case Change::DELETED:
 320                         if (old == Change::UNCHANGED) {
 321                                 os << start;
 322                                 column += start.length();
 323                         }
 324                         os << son;
 325                         column += son.length();
 326                         break;
 327
 328                 case Change::INSERTED:
 329                         if (old == Change::UNCHANGED) {
 330                                 os << start;
 331                                 column += start.length();
 332                         }
 333                         break;
 334         }
 335
 336         return column;
 337 }
 338
 339
 340 void Changes::lyxMarkChange(std::ostream & os, int & column,
 341                             time_type const curtime,
 342                             Change const & old, Change const & change)
 343 {
 344         // FIXME: change tracking (MG)
 345         if (old == change)
 346                 return;
 347
 348         column = 0;
 349
 350         switch (change.type) {
 351                 case Change::UNCHANGED:
 352                         os << "\n\\change_unchanged\n";
 353                         break;
 354
 355                 case Change::DELETED: {
 356                         time_type t = change.changetime;
 357                         if (!t)
 358                                 t = curtime;
 359                         os << "\n\\change_deleted " << change.author
 360                                 << " " << t << "\n";
 361
 362                         break;
 363                 }
 364
 365         case Change::INSERTED: {
 366                         time_type t = change.changetime;
 367                         if (!t)
 368                                 t = curtime;
 369                         os << "\n\\change_inserted " << change.author
 370                                 << " " << t << "\n";
 371                         break;
 372         }
 373         }
 374 }
 375
 376
 377 } // namespace lyx