summaryrefslogtreecommitdiffstats
path: root/starmath/source/cursor.cxx
blob: 6f8e9b0af042252384e5ef5b54a3578cfa795665 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */
#include <cursor.hxx>
#include <visitors.hxx>
#include <document.hxx>
#include <view.hxx>
#include <comphelper/string.hxx>
#include <comphelper/lok.hxx>
#include <editeng/editeng.hxx>
#include <LibreOfficeKit/LibreOfficeKitEnums.h>
#include <osl/diagnose.h>
#include <sfx2/lokhelper.hxx>
#include <vcl/transfer.hxx>
#include <vcl/unohelp2.hxx>

void SmCursor::Move(OutputDevice* pDev, SmMovementDirection direction, bool bMoveAnchor){
    SmCaretPosGraphEntry* NewPos = nullptr;
    switch(direction)
    {
        case MoveLeft:
            if (mpPosition)
                NewPos = mpPosition->Left;
            OSL_ENSURE(NewPos, "NewPos shouldn't be NULL here!");
            break;
        case MoveRight:
            if (mpPosition)
                NewPos = mpPosition->Right;
            OSL_ENSURE(NewPos, "NewPos shouldn't be NULL here!");
            break;
        case MoveUp:
            //Implementation is practically identical to MoveDown, except for a single if statement
            //so I've implemented them together and added a direction == MoveDown to the if statements.
        case MoveDown:
            if (mpPosition)
            {
                SmCaretLine from_line = SmCaretPos2LineVisitor(pDev, mpPosition->CaretPos).GetResult(),
                            best_line,  //Best approximated line found so far
                            curr_line;  //Current line
                tools::Long dbp_sq = 0;        //Distance squared to best line
                for(const auto &pEntry : *mpGraph)
                {
                    //Reject it if it's the current position
                    if(pEntry->CaretPos == mpPosition->CaretPos) continue;
                    //Compute caret line
                    curr_line = SmCaretPos2LineVisitor(pDev, pEntry->CaretPos).GetResult();
                    //Reject anything above if we're moving down
                    if(curr_line.GetTop() <= from_line.GetTop() && direction == MoveDown) continue;
                    //Reject anything below if we're moving up
                    if(curr_line.GetTop() + curr_line.GetHeight() >= from_line.GetTop() + from_line.GetHeight()
                            && direction == MoveUp) continue;
                    //Compare if it to what we have, if we have anything yet
                    if(NewPos){
                        //Compute distance to current line squared, multiplied with a horizontal factor
                        tools::Long dp_sq = curr_line.SquaredDistanceX(from_line) * HORIZONTICAL_DISTANCE_FACTOR +
                                     curr_line.SquaredDistanceY(from_line);
                        //Discard current line if best line is closer
                        if(dbp_sq <= dp_sq) continue;
                    }
                    //Take current line as the best
                    best_line = curr_line;
                    NewPos = pEntry.get();
                    //Update distance to best line
                    dbp_sq = best_line.SquaredDistanceX(from_line) * HORIZONTICAL_DISTANCE_FACTOR +
                             best_line.SquaredDistanceY(from_line);
                }
            }
            break;
        default:
            assert(false);
    }
    if(NewPos){
        mpPosition = NewPos;
        if(bMoveAnchor)
            mpAnchor = NewPos;
        RequestRepaint();
    }
}

void SmCursor::MoveTo(OutputDevice* pDev, const Point& pos, bool bMoveAnchor)
{
    SmCaretPosGraphEntry* NewPos = nullptr;
    tools::Long dp_sq = 0,     //Distance to current line squared
         dbp_sq = 1;    //Distance to best line squared
    for(const auto &pEntry : *mpGraph)
    {
        OSL_ENSURE(pEntry->CaretPos.IsValid(), "The caret position graph may not have invalid positions!");
        //Compute current line
        SmCaretLine curr_line = SmCaretPos2LineVisitor(pDev, pEntry->CaretPos).GetResult();
        //Compute squared distance to current line
        dp_sq = curr_line.SquaredDistanceX(pos) + curr_line.SquaredDistanceY(pos);
        //If we have a position compare to it
        if(NewPos){
            //If best line is closer, reject current line
            if(dbp_sq <= dp_sq) continue;
        }
        //Accept current position as the best
        NewPos = pEntry.get();
        //Update distance to best line
        dbp_sq = dp_sq;
    }
    if(NewPos){
        mpPosition = NewPos;
        if(bMoveAnchor)
            mpAnchor = NewPos;
        RequestRepaint();
    }
}

void SmCursor::BuildGraph(){
    //Save the current anchor and position
    SmCaretPos _anchor, _position;
    //Release mpGraph if allocated
    if(mpGraph){
        if(mpAnchor)
            _anchor = mpAnchor->CaretPos;
        if(mpPosition)
            _position = mpPosition->CaretPos;
        mpGraph.reset();
        //Reset anchor and position as they point into an old graph
        mpAnchor = nullptr;
        mpPosition = nullptr;
    }

    //Build the new graph
    mpGraph.reset(SmCaretPosGraphBuildingVisitor(mpTree).takeGraph());

    //Restore anchor and position pointers
    if(_anchor.IsValid() || _position.IsValid()){
        for(const auto &pEntry : *mpGraph)
        {
            if(_anchor == pEntry->CaretPos)
                mpAnchor = pEntry.get();
            if(_position == pEntry->CaretPos)
                mpPosition = pEntry.get();
        }
    }
    //Set position and anchor to first caret position
    auto it = mpGraph->begin();
    assert(it != mpGraph->end());
    if(!mpPosition)
        mpPosition = it->get();
    if(!mpAnchor)
        mpAnchor = mpPosition;

    assert(mpPosition);
    assert(mpAnchor);
    OSL_ENSURE(mpPosition->CaretPos.IsValid(), "Position must be valid");
    OSL_ENSURE(mpAnchor->CaretPos.IsValid(), "Anchor must be valid");
}

bool SmCursor::SetCaretPosition(SmCaretPos pos){
    for(const auto &pEntry : *mpGraph)
    {
        if(pEntry->CaretPos == pos)
        {
            mpPosition = pEntry.get();
            mpAnchor = pEntry.get();
            return true;
        }
    }
    return false;
}

void SmCursor::AnnotateSelection() const {
    //TODO: Manage a state, reset it upon modification and optimize this call
    SmSetSelectionVisitor(mpAnchor->CaretPos, mpPosition->CaretPos, mpTree);
}

void SmCursor::Draw(OutputDevice& pDev, Point Offset, bool isCaretVisible){
    SmCaretDrawingVisitor(pDev, GetPosition(), Offset, isCaretVisible);
}

tools::Rectangle SmCursor::GetCaretRectangle(OutputDevice& rOutDev) const
{
    return SmCaretRectanglesVisitor(rOutDev, GetPosition()).getCaret();
}

tools::Rectangle SmCursor::GetSelectionRectangle(OutputDevice& rOutDev) const
{
    AnnotateSelection();
    return SmSelectionRectanglesVisitor(rOutDev, mpTree).GetSelection();
}

void SmCursor::DeletePrev(OutputDevice* pDev){
    //Delete only a selection if there's a selection
    if(HasSelection()){
        Delete();
        return;
    }

    SmNode* pLine = FindTopMostNodeInLine(mpPosition->CaretPos.pSelectedNode);
    SmStructureNode* pLineParent = pLine->GetParent();
    int nLineOffsetIdx = pLineParent->IndexOfSubNode(pLine);
    assert(nLineOffsetIdx >= 0);

    //If we're in front of a node who's parent is a TABLE
    if (pLineParent->GetType() == SmNodeType::Table && mpPosition->CaretPos.nIndex == 0 && nLineOffsetIdx > 0)
    {
        size_t nLineOffset = nLineOffsetIdx;
        //Now we can merge with nLineOffset - 1
        BeginEdit();
        //Line to merge things into, so we can delete pLine
        SmNode* pMergeLine = pLineParent->GetSubNode(nLineOffset-1);
        OSL_ENSURE(pMergeLine, "pMergeLine cannot be NULL!");
        SmCaretPos PosAfterDelete;
        //Convert first line to list
        std::unique_ptr<SmNodeList> pLineList(new SmNodeList);
        NodeToList(pMergeLine, *pLineList);
        if(!pLineList->empty()){
            //Find iterator to patch
            SmNodeList::iterator patchPoint = pLineList->end();
            --patchPoint;
            //Convert second line to list
            NodeToList(pLine, *pLineList);
            //Patch the line list
            ++patchPoint;
            PosAfterDelete = PatchLineList(pLineList.get(), patchPoint);
            //Parse the line
            pLine = SmNodeListParser().Parse(pLineList.get());
        }
        pLineList.reset();
        pLineParent->SetSubNode(nLineOffset-1, pLine);
        //Delete the removed line slot
        SmNodeArray lines(pLineParent->GetNumSubNodes()-1);
        for (size_t i = 0; i < pLineParent->GetNumSubNodes(); ++i)
        {
            if(i < nLineOffset)
                lines[i] = pLineParent->GetSubNode(i);
            else if(i > nLineOffset)
                lines[i-1] = pLineParent->GetSubNode(i);
        }
        pLineParent->SetSubNodes(std::move(lines));
        //Rebuild graph
        mpAnchor = nullptr;
        mpPosition = nullptr;
        BuildGraph();
        AnnotateSelection();
        //Set caret position
        if(!SetCaretPosition(PosAfterDelete))
            SetCaretPosition(SmCaretPos(pLine, 0));
        //Finish editing
        EndEdit();

    //TODO: If we're in an empty (sub/super/*) script
    /*}else if(pLineParent->GetType() == SmNodeType::SubSup &&
             nLineOffset != 0 &&
             pLine->GetType() == SmNodeType::Expression &&
             pLine->GetNumSubNodes() == 0){
        //There's a (sub/super) script we can delete
    //Consider selecting the entire script if GetNumSubNodes() != 0 or pLine->GetType() != SmNodeType::Expression
    //TODO: Handle case where we delete a limit
    */

    //Else move select, and delete if not complex
    }else{
        Move(pDev, MoveLeft, false);
        if(!HasComplexSelection())
            Delete();
    }
}

void SmCursor::Delete(){
    //Return if we don't have a selection to delete
    if(!HasSelection())
        return;

    //Enter edit section
    BeginEdit();

    //Set selected on nodes
    AnnotateSelection();

    //Find an arbitrary selected node
    SmNode* pSNode = FindSelectedNode(mpTree);
    assert(pSNode);

    //Find the topmost node of the line that holds the selection
    SmNode* pLine = FindTopMostNodeInLine(pSNode, true);
    OSL_ENSURE(pLine != mpTree, "Shouldn't be able to select the entire tree");

    //Get the parent of the line
    SmStructureNode* pLineParent = pLine->GetParent();
    //Find line offset in parent
    int nLineOffset = pLineParent->IndexOfSubNode(pLine);
    assert(nLineOffset >= 0);

    //Position after delete
    SmCaretPos PosAfterDelete;

    std::unique_ptr<SmNodeList> pLineList(new SmNodeList);
    NodeToList(pLine, *pLineList);

    //Take the selected nodes and delete them...
    SmNodeList::iterator patchIt = TakeSelectedNodesFromList(pLineList.get());

    //Get the position to set after delete
    PosAfterDelete = PatchLineList(pLineList.get(), patchIt);

    //Finish editing
    FinishEdit(std::move(pLineList), pLineParent, nLineOffset, PosAfterDelete);
}

void SmCursor::InsertNodes(std::unique_ptr<SmNodeList> pNewNodes){
    if(pNewNodes->empty()){
        return;
    }

    //Begin edit section
    BeginEdit();

    //Get the current position
    const SmCaretPos pos = mpPosition->CaretPos;

    //Find top most of line that holds position
    SmNode* pLine = FindTopMostNodeInLine(pos.pSelectedNode);
    const bool bSelectedIsTopMost = pLine == pos.pSelectedNode;

    //Find line parent and line index in parent
    SmStructureNode* pLineParent = pLine->GetParent();
    int nParentIndex = pLineParent->IndexOfSubNode(pLine);
    assert(nParentIndex >= 0);

    //Convert line to list
    std::unique_ptr<SmNodeList> pLineList(new SmNodeList);
    NodeToList(pLine, *pLineList); // deletes pLine, potentially deleting pos.pSelectedNode

    //Find iterator for place to insert nodes
    SmNodeList::iterator it = bSelectedIsTopMost ? pLineList->begin()
                                                 : FindPositionInLineList(pLineList.get(), pos);

    //Insert all new nodes
    SmNodeList::iterator newIt,
                         patchIt = it, // (pointless default value, fixes compiler warnings)
                         insIt;
    for(newIt = pNewNodes->begin(); newIt != pNewNodes->end(); ++newIt){
        insIt = pLineList->insert(it, *newIt);
        if(newIt == pNewNodes->begin())
            patchIt = insIt;
    }
    //Patch the places we've changed stuff
    PatchLineList(pLineList.get(), patchIt);
    SmCaretPos PosAfterInsert = PatchLineList(pLineList.get(), it);
    //Release list, we've taken the nodes
    pNewNodes.reset();

    //Finish editing
    FinishEdit(std::move(pLineList), pLineParent, nParentIndex, PosAfterInsert);
}

SmNodeList::iterator SmCursor::FindPositionInLineList(SmNodeList* pLineList,
                                                      const SmCaretPos& rCaretPos)
{
    //Find iterator for position
    SmNodeList::iterator it = std::find(pLineList->begin(), pLineList->end(), rCaretPos.pSelectedNode);
    if (it != pLineList->end())
    {
        if((*it)->GetType() == SmNodeType::Text)
        {
            //Split textnode if needed
            if(rCaretPos.nIndex > 0)
            {
                SmTextNode* pText = static_cast<SmTextNode*>(rCaretPos.pSelectedNode);
                if (rCaretPos.nIndex == pText->GetText().getLength())
                    return ++it;
                OUString str1 = pText->GetText().copy(0, rCaretPos.nIndex);
                OUString str2 = pText->GetText().copy(rCaretPos.nIndex);
                pText->ChangeText(str1);
                ++it;
                //Insert str2 as new text node
                assert(!str2.isEmpty());
                SmTextNode* pNewText = new SmTextNode(pText->GetToken(), pText->GetFontDesc());
                pNewText->ChangeText(str2);
                it = pLineList->insert(it, pNewText);
            }
        }else
            ++it;
        //it now pointer to the node following pos, so pLineList->insert(it, ...) will insert correctly
        return it;
    }
    //If we didn't find pSelectedNode, it must be because the caret is in front of the line
    return pLineList->begin();
}

SmCaretPos SmCursor::PatchLineList(SmNodeList* pLineList, SmNodeList::iterator aIter) {
    //The nodes we should consider merging
    SmNode *prev = nullptr,
           *next = nullptr;
    if(aIter != pLineList->end())
        next = *aIter;
    if(aIter != pLineList->begin()) {
        --aIter;
        prev = *aIter;
        ++aIter;
    }

    //Check if there's textnodes to merge
    if( prev &&
        next &&
        prev->GetType() == SmNodeType::Text &&
        next->GetType() == SmNodeType::Text &&
        ( prev->GetToken().eType != TNUMBER ||
          next->GetToken().eType == TNUMBER) ){
        SmTextNode *pText = static_cast<SmTextNode*>(prev),
                   *pOldN = static_cast<SmTextNode*>(next);
        SmCaretPos retval(pText, pText->GetText().getLength());
        OUString newText = pText->GetText() + pOldN->GetText();
        pText->ChangeText(newText);
        delete pOldN;
        pLineList->erase(aIter);
        return retval;
    }

    //Check if there's a SmPlaceNode to remove:
    if(prev && next && prev->GetType() == SmNodeType::Place && !SmNodeListParser::IsOperator(next->GetToken())){
        --aIter;
        aIter = pLineList->erase(aIter);
        delete prev;
        //Return caret pos in front of aIter
        if(aIter != pLineList->begin())
            --aIter; //Thus find node before aIter
        if(aIter == pLineList->begin())
            return SmCaretPos();
        return SmCaretPos::GetPosAfter(*aIter);
    }
    if(prev && next && next->GetType() == SmNodeType::Place && !SmNodeListParser::IsOperator(prev->GetToken())){
        aIter = pLineList->erase(aIter);
        delete next;
        return SmCaretPos::GetPosAfter(prev);
    }

    //If we didn't do anything return
    if(!prev) //return an invalid to indicate we're in front of line
        return SmCaretPos();
    return SmCaretPos::GetPosAfter(prev);
}

SmNodeList::iterator SmCursor::TakeSelectedNodesFromList(SmNodeList *pLineList,
                                                         SmNodeList *pSelectedNodes) {
    SmNodeList::iterator retval;
    SmNodeList::iterator it = pLineList->begin();
    while(it != pLineList->end()){
        if((*it)->IsSelected()){
            //Split text nodes
            if((*it)->GetType() == SmNodeType::Text) {
                SmTextNode* pText = static_cast<SmTextNode*>(*it);
                OUString aText = pText->GetText();
                //Start and lengths of the segments, 2 is the selected segment
                int start2 = pText->GetSelectionStart(),
                    start3 = pText->GetSelectionEnd(),
                    len1 = start2 - 0,
                    len2 = start3 - start2,
                    len3 = aText.getLength() - start3;
                SmToken aToken = pText->GetToken();
                sal_uInt16 eFontDesc = pText->GetFontDesc();
                //If we need make segment 1
                if(len1 > 0) {
                    OUString str = aText.copy(0, len1);
                    pText->ChangeText(str);
                    ++it;
                } else {//Remove it if not needed
                    it = pLineList->erase(it);
                    delete pText;
                }
                //Set retval to be right after the selection
                retval = it;
                //if we need make segment 3
                if(len3 > 0) {
                    OUString str = aText.copy(start3, len3);
                    SmTextNode* pSeg3 = new SmTextNode(aToken, eFontDesc);
                    pSeg3->ChangeText(str);
                    retval = pLineList->insert(it, pSeg3);
                }
                //If we need to save the selected text
                if(pSelectedNodes && len2 > 0) {
                    OUString str = aText.copy(start2, len2);
                    SmTextNode* pSeg2 = new SmTextNode(aToken, eFontDesc);
                    pSeg2->ChangeText(str);
                    pSelectedNodes->push_back(pSeg2);
                }
            } else { //if it's not textnode
                SmNode* pNode = *it;
                retval = it = pLineList->erase(it);
                if(pSelectedNodes)
                    pSelectedNodes->push_back(pNode);
                else
                    delete pNode;
            }
        } else
            ++it;
    }
    return retval;
}

void SmCursor::InsertSubSup(SmSubSup eSubSup) {
    AnnotateSelection();

    //Find line
    SmNode *pLine;
    if(HasSelection()) {
        SmNode *pSNode = FindSelectedNode(mpTree);
        assert(pSNode);
        pLine = FindTopMostNodeInLine(pSNode, true);
    } else
        pLine = FindTopMostNodeInLine(mpPosition->CaretPos.pSelectedNode);

    //Find Parent and offset in parent
    SmStructureNode *pLineParent = pLine->GetParent();
    int nParentIndex = pLineParent->IndexOfSubNode(pLine);
    assert(nParentIndex >= 0);

    //TODO: Consider handling special cases where parent is an SmOperNode,
    //      Maybe this method should be able to add limits to an SmOperNode...

    //We begin modifying the tree here
    BeginEdit();

    //Convert line to list
    std::unique_ptr<SmNodeList> pLineList(new SmNodeList);
    NodeToList(pLine, *pLineList);

    //Take the selection, and/or find iterator for current position
    std::unique_ptr<SmNodeList> pSelectedNodesList(new SmNodeList);
    SmNodeList::iterator it;
    if(HasSelection())
        it = TakeSelectedNodesFromList(pLineList.get(), pSelectedNodesList.get());
    else
        it = FindPositionInLineList(pLineList.get(), mpPosition->CaretPos);

    //Find node that this should be applied to
    SmNode* pSubject;
    bool bPatchLine = !pSelectedNodesList->empty(); //If the line should be patched later
    if(it != pLineList->begin()) {
        --it;
        pSubject = *it;
        ++it;
    } else {
        //Create a new place node
        pSubject = new SmPlaceNode();
        pSubject->Prepare(mpDocShell->GetFormat(), *mpDocShell, 0);
        it = pLineList->insert(it, pSubject);
        ++it;
        bPatchLine = true;  //We've modified the line it should be patched later.
    }

    //Wrap the subject in a SmSubSupNode
    SmSubSupNode* pSubSup;
    if(pSubject->GetType() != SmNodeType::SubSup){
        SmToken token;
        token.nGroup = TG::Power;
        pSubSup = new SmSubSupNode(token);
        pSubSup->SetBody(pSubject);
        *(--it) = pSubSup;
        ++it;
    }else
        pSubSup = static_cast<SmSubSupNode*>(pSubject);
    //pSubject shouldn't be referenced anymore, pSubSup is the SmSubSupNode in pLineList we wish to edit.
    //and it pointer to the element following pSubSup in pLineList.
    pSubject = nullptr;

    //Patch the line if we noted that was needed previously
    if(bPatchLine)
        PatchLineList(pLineList.get(), it);

    //Convert existing, if any, sub-/superscript line to list
    SmNode *pScriptLine = pSubSup->GetSubSup(eSubSup);
    std::unique_ptr<SmNodeList> pScriptLineList(new SmNodeList);
    NodeToList(pScriptLine, *pScriptLineList);

    //Add selection to pScriptLineList
    unsigned int nOldSize = pScriptLineList->size();
    pScriptLineList->insert(pScriptLineList->end(), pSelectedNodesList->begin(), pSelectedNodesList->end());
    pSelectedNodesList.reset();

    //Patch pScriptLineList if needed
    if(0 < nOldSize && nOldSize < pScriptLineList->size()) {
        SmNodeList::iterator iPatchPoint = pScriptLineList->begin();
        std::advance(iPatchPoint, nOldSize);
        PatchLineList(pScriptLineList.get(), iPatchPoint);
    }

    //Find caret pos, that should be used after sub-/superscription.
    SmCaretPos PosAfterScript; //Leave invalid for first position
    if (!pScriptLineList->empty())
        PosAfterScript = SmCaretPos::GetPosAfter(pScriptLineList->back());

    //Parse pScriptLineList
    pScriptLine = SmNodeListParser().Parse(pScriptLineList.get());
    pScriptLineList.reset();

    //Insert pScriptLine back into the tree
    pSubSup->SetSubSup(eSubSup, pScriptLine);

    //Finish editing
    FinishEdit(std::move(pLineList), pLineParent, nParentIndex, PosAfterScript, pScriptLine);
}

void SmCursor::InsertBrackets(SmBracketType eBracketType) {
    BeginEdit();

    AnnotateSelection();

    //Find line
    SmNode *pLine;
    if(HasSelection()) {
        SmNode *pSNode = FindSelectedNode(mpTree);
        assert(pSNode);
        pLine = FindTopMostNodeInLine(pSNode, true);
    } else
        pLine = FindTopMostNodeInLine(mpPosition->CaretPos.pSelectedNode);

    //Find parent and offset in parent
    SmStructureNode *pLineParent = pLine->GetParent();
    int nParentIndex = pLineParent->IndexOfSubNode(pLine);
    assert(nParentIndex >= 0);

    //Convert line to list
    std::unique_ptr<SmNodeList> pLineList(new SmNodeList);
    NodeToList(pLine, *pLineList);

    //Take the selection, and/or find iterator for current position
    std::unique_ptr<SmNodeList> pSelectedNodesList(new SmNodeList);
    SmNodeList::iterator it;
    if(HasSelection())
        it = TakeSelectedNodesFromList(pLineList.get(), pSelectedNodesList.get());
    else
        it = FindPositionInLineList(pLineList.get(), mpPosition->CaretPos);

    //If there's no selected nodes, create a place node
    std::unique_ptr<SmNode> pBodyNode;
    SmCaretPos PosAfterInsert;
    if(pSelectedNodesList->empty()) {
        pBodyNode.reset(new SmPlaceNode());
        PosAfterInsert = SmCaretPos(pBodyNode.get(), 1);
    } else
        pBodyNode.reset(SmNodeListParser().Parse(pSelectedNodesList.get()));

    pSelectedNodesList.reset();

    //Create SmBraceNode
    SmToken aTok(TLEFT, '\0', "left", TG::NONE, 5);
    SmBraceNode *pBrace = new SmBraceNode(aTok);
    pBrace->SetScaleMode(SmScaleMode::Height);
    std::unique_ptr<SmNode> pLeft( CreateBracket(eBracketType, true) ),
                            pRight( CreateBracket(eBracketType, false) );
    std::unique_ptr<SmBracebodyNode> pBody(new SmBracebodyNode(SmToken()));
    pBody->SetSubNodes(std::move(pBodyNode), nullptr);
    pBrace->SetSubNodes(std::move(pLeft), std::move(pBody), std::move(pRight));
    pBrace->Prepare(mpDocShell->GetFormat(), *mpDocShell, 0);

    //Insert into line
    pLineList->insert(it, pBrace);
    //Patch line (I think this is good enough)
    SmCaretPos aAfter = PatchLineList(pLineList.get(), it);
    if( !PosAfterInsert.IsValid() )
        PosAfterInsert = aAfter;

    //Finish editing
    FinishEdit(std::move(pLineList), pLineParent, nParentIndex, PosAfterInsert);
}

SmNode *SmCursor::CreateBracket(SmBracketType eBracketType, bool bIsLeft) {
    SmToken aTok;
    if(bIsLeft){
        switch(eBracketType){
            case SmBracketType::Round:
                aTok = SmToken(TLPARENT, MS_LPARENT, "(", TG::LBrace, 5);
                break;
            case SmBracketType::Square:
                aTok = SmToken(TLBRACKET, MS_LBRACKET, "[", TG::LBrace, 5);
                break;
            case SmBracketType::Curly:
                aTok = SmToken(TLBRACE, MS_LBRACE, "lbrace", TG::LBrace, 5);
                break;
        }
    } else {
        switch(eBracketType) {
            case SmBracketType::Round:
                aTok = SmToken(TRPARENT, MS_RPARENT, ")", TG::RBrace, 5);
                break;
            case SmBracketType::Square:
                aTok = SmToken(TRBRACKET, MS_RBRACKET, "]", TG::RBrace, 5);
                break;
            case SmBracketType::Curly:
                aTok = SmToken(TRBRACE, MS_RBRACE, "rbrace", TG::RBrace, 5);
                break;
        }
    }
    SmNode* pRetVal = new SmMathSymbolNode(aTok);
    pRetVal->SetScaleMode(SmScaleMode::Height);
    return pRetVal;
}

bool SmCursor::InsertRow() {
    AnnotateSelection();

    //Find line
    SmNode *pLine;
    if(HasSelection()) {
        SmNode *pSNode = FindSelectedNode(mpTree);
        assert(pSNode);
        pLine = FindTopMostNodeInLine(pSNode, true);
    } else
        pLine = FindTopMostNodeInLine(mpPosition->CaretPos.pSelectedNode);

    //Find parent and offset in parent
    SmStructureNode *pLineParent = pLine->GetParent();
    int nParentIndex = pLineParent->IndexOfSubNode(pLine);
    assert(nParentIndex >= 0);

    //Discover the context of this command
    SmTableNode  *pTable  = nullptr;
    SmMatrixNode *pMatrix = nullptr;
    int nTableIndex = nParentIndex;
    if(pLineParent->GetType() == SmNodeType::Table)
        pTable = static_cast<SmTableNode*>(pLineParent);
    //If it's wrapped in a SmLineNode, we can still insert a newline
    else if(pLineParent->GetType() == SmNodeType::Line &&
            pLineParent->GetParent() &&
            pLineParent->GetParent()->GetType() == SmNodeType::Table) {
        //NOTE: This hack might give problems if we stop ignoring SmAlignNode
        pTable = static_cast<SmTableNode*>(pLineParent->GetParent());
        nTableIndex = pTable->IndexOfSubNode(pLineParent);
        assert(nTableIndex >= 0);
    }
    if(pLineParent->GetType() == SmNodeType::Matrix)
        pMatrix = static_cast<SmMatrixNode*>(pLineParent);

    //If we're not in a context that supports InsertRow, return sal_False
    if(!pTable && !pMatrix)
        return false;

    //Now we start editing
    BeginEdit();

    //Convert line to list
    std::unique_ptr<SmNodeList> pLineList(new SmNodeList);
    NodeToList(pLine, *pLineList);

    //Find position in line
    SmNodeList::iterator it;
    if(HasSelection()) {
        //Take the selected nodes and delete them...
        it = TakeSelectedNodesFromList(pLineList.get());
    } else
        it = FindPositionInLineList(pLineList.get(), mpPosition->CaretPos);

    //New caret position after inserting the newline/row in whatever context
    SmCaretPos PosAfterInsert;

    //If we're in the context of a table
    if(pTable) {
        std::unique_ptr<SmNodeList> pNewLineList(new SmNodeList);
        //Move elements from pLineList to pNewLineList
        SmNodeList& rLineList = *pLineList;
        pNewLineList->splice(pNewLineList->begin(), rLineList, it, rLineList.end());
        //Make sure it is valid again
        it = pLineList->end();
        if(it != pLineList->begin())
            --it;
        if(pNewLineList->empty())
            pNewLineList->push_front(new SmPlaceNode());
        //Parse new line
        std::unique_ptr<SmNode> pNewLine(SmNodeListParser().Parse(pNewLineList.get()));
        pNewLineList.reset();
        //Wrap pNewLine in SmLineNode if needed
        if(pLineParent->GetType() == SmNodeType::Line) {
            std::unique_ptr<SmLineNode> pNewLineNode(new SmLineNode(SmToken(TNEWLINE, '\0', "newline")));
            pNewLineNode->SetSubNodes(std::move(pNewLine), nullptr);
            pNewLine = std::move(pNewLineNode);
        }
        //Get position
        PosAfterInsert = SmCaretPos(pNewLine.get(), 0);
        //Move other nodes if needed
        for( int i = pTable->GetNumSubNodes(); i > nTableIndex + 1; i--)
            pTable->SetSubNode(i, pTable->GetSubNode(i-1));

        //Insert new line
        pTable->SetSubNode(nTableIndex + 1, pNewLine.release());

        //Check if we need to change token type:
        if(pTable->GetNumSubNodes() > 2 && pTable->GetToken().eType == TBINOM) {
            SmToken tok = pTable->GetToken();
            tok.eType = TSTACK;
            pTable->SetToken(tok);
        }
    }
    //If we're in the context of a matrix
    else {
        //Find position after insert and patch the list
        PosAfterInsert = PatchLineList(pLineList.get(), it);
        //Move other children
        sal_uInt16 rows = pMatrix->GetNumRows();
        sal_uInt16 cols = pMatrix->GetNumCols();
        int nRowStart = (nParentIndex - nParentIndex % cols) + cols;
        for( int i = pMatrix->GetNumSubNodes() + cols - 1; i >= nRowStart + cols; i--)
            pMatrix->SetSubNode(i, pMatrix->GetSubNode(i - cols));
        for( int i = nRowStart; i < nRowStart + cols; i++) {
            SmPlaceNode *pNewLine = new SmPlaceNode();
            if(i == nParentIndex + cols)
                PosAfterInsert = SmCaretPos(pNewLine, 0);
            pMatrix->SetSubNode(i, pNewLine);
        }
        pMatrix->SetRowCol(rows + 1, cols);
    }

    //Finish editing
    FinishEdit(std::move(pLineList), pLineParent, nParentIndex, PosAfterInsert);
    //FinishEdit is actually used to handle situations where parent is an instance of
    //SmSubSupNode. In this case parent should always be a table or matrix, however, for
    //code reuse we just use FinishEdit() here too.
    return true;
}

void SmCursor::InsertFraction() {
    AnnotateSelection();

    //Find line
    SmNode *pLine;
    if(HasSelection()) {
        SmNode *pSNode = FindSelectedNode(mpTree);
        assert(pSNode);
        pLine = FindTopMostNodeInLine(pSNode, true);
    } else
        pLine = FindTopMostNodeInLine(mpPosition->CaretPos.pSelectedNode);

    //Find Parent and offset in parent
    SmStructureNode *pLineParent = pLine->GetParent();
    int nParentIndex = pLineParent->IndexOfSubNode(pLine);
    assert(nParentIndex >= 0);

    //We begin modifying the tree here
    BeginEdit();

    //Convert line to list
    std::unique_ptr<SmNodeList> pLineList(new SmNodeList);
    NodeToList(pLine, *pLineList);

    //Take the selection, and/or find iterator for current position
    std::unique_ptr<SmNodeList> pSelectedNodesList(new SmNodeList);
    SmNodeList::iterator it;
    if(HasSelection())
        it = TakeSelectedNodesFromList(pLineList.get(), pSelectedNodesList.get());
    else
        it = FindPositionInLineList(pLineList.get(), mpPosition->CaretPos);

    //Create pNum, and pDenom
    bool bEmptyFraction = pSelectedNodesList->empty();
    std::unique_ptr<SmNode> pNum( bEmptyFraction
        ? new SmPlaceNode()
        : SmNodeListParser().Parse(pSelectedNodesList.get()) );
    std::unique_ptr<SmNode> pDenom(new SmPlaceNode());
    pSelectedNodesList.reset();

    //Create new fraction
    SmBinVerNode *pFrac = new SmBinVerNode(SmToken(TOVER, '\0', "over", TG::Product, 0));
    std::unique_ptr<SmNode> pRect(new SmRectangleNode(SmToken()));
    pFrac->SetSubNodes(std::move(pNum), std::move(pRect), std::move(pDenom));

    //Insert in pLineList
    SmNodeList::iterator patchIt = pLineList->insert(it, pFrac);
    PatchLineList(pLineList.get(), patchIt);
    PatchLineList(pLineList.get(), it);

    //Finish editing
    SmNode *pSelectedNode = bEmptyFraction ? pFrac->GetSubNode(0) : pFrac->GetSubNode(2);
    FinishEdit(std::move(pLineList), pLineParent, nParentIndex, SmCaretPos(pSelectedNode, 1));
}

void SmCursor::InsertText(const OUString& aString)
{
    BeginEdit();

    Delete();

    SmToken token;
    token.eType = TIDENT;
    token.cMathChar = u""_ustr;
    token.nGroup = TG::NONE;
    token.nLevel = 5;
    token.aText = aString;

    SmTextNode* pText = new SmTextNode(token, FNT_VARIABLE);
    pText->SetText(aString);
    pText->AdjustFontDesc();
    pText->Prepare(mpDocShell->GetFormat(), *mpDocShell, 0);

    std::unique_ptr<SmNodeList> pList(new SmNodeList);
    pList->push_front(pText);
    InsertNodes(std::move(pList));

    EndEdit();
}

void SmCursor::InsertElement(SmFormulaElement element){
    BeginEdit();

    Delete();

    //Create new node
    SmNode* pNewNode = nullptr;
    switch(element){
        case BlankElement:
        {
            SmToken token;
            token.eType = TBLANK;
            token.nGroup = TG::Blank;
            token.aText = "~";
            SmBlankNode* pBlankNode = new SmBlankNode(token);
            pBlankNode->IncreaseBy(token);
            pNewNode = pBlankNode;
        }break;
        case FactorialElement:
        {
            SmToken token(TFACT, MS_FACT, "fact", TG::UnOper, 5);
            pNewNode = new SmMathSymbolNode(token);
        }break;
        case PlusElement:
        {
            SmToken token;
            token.eType = TPLUS;
            token.setChar(MS_PLUS);
            token.nGroup = TG::UnOper | TG::Sum;
            token.nLevel = 5;
            token.aText = "+";
            pNewNode = new SmMathSymbolNode(token);
        }break;
        case MinusElement:
        {
            SmToken token;
            token.eType = TMINUS;
            token.setChar(MS_MINUS);
            token.nGroup = TG::UnOper | TG::Sum;
            token.nLevel = 5;
            token.aText = "-";
            pNewNode = new SmMathSymbolNode(token);
        }break;
        case CDotElement:
        {
            SmToken token;
            token.eType = TCDOT;
            token.setChar(MS_CDOT);
            token.nGroup = TG::Product;
            token.aText = "cdot";
            pNewNode = new SmMathSymbolNode(token);
        }break;
        case EqualElement:
        {
            SmToken token;
            token.eType = TASSIGN;
            token.setChar(MS_ASSIGN);
            token.nGroup = TG::Relation;
            token.aText = "=";
            pNewNode = new SmMathSymbolNode(token);
        }break;
        case LessThanElement:
        {
            SmToken token;
            token.eType = TLT;
            token.setChar(MS_LT);
            token.nGroup = TG::Relation;
            token.aText = "<";
            pNewNode = new SmMathSymbolNode(token);
        }break;
        case GreaterThanElement:
        {
            SmToken token;
            token.eType = TGT;
            token.setChar(MS_GT);
            token.nGroup = TG::Relation;
            token.aText = ">";
            pNewNode = new SmMathSymbolNode(token);
        }break;
        case PercentElement:
        {
            SmToken token;
            token.eType = TTEXT;
            token.setChar(MS_PERCENT);
            token.nGroup = TG::NONE;
            token.aText = "\"%\"";
            pNewNode = new SmMathSymbolNode(token);
        }break;
    }
    assert(pNewNode);

    //Prepare the new node
    pNewNode->Prepare(mpDocShell->GetFormat(), *mpDocShell, 0);

    //Insert new node
    std::unique_ptr<SmNodeList> pList(new SmNodeList);
    pList->push_front(pNewNode);
    InsertNodes(std::move(pList));

    EndEdit();
}

void SmCursor::InsertSpecial(std::u16string_view _aString)
{
    BeginEdit();
    Delete();

    OUString aString( comphelper::string::strip(_aString, ' ') );

    //Create instance of special node
    SmToken token;
    token.eType = TSPECIAL;
    token.cMathChar = u""_ustr;
    token.nGroup = TG::NONE;
    token.nLevel = 5;
    token.aText = aString;
    SmSpecialNode* pSpecial = new SmSpecialNode(token);

    //Prepare the special node
    pSpecial->Prepare(mpDocShell->GetFormat(), *mpDocShell, 0);

    //Insert the node
    std::unique_ptr<SmNodeList> pList(new SmNodeList);
    pList->push_front(pSpecial);
    InsertNodes(std::move(pList));

    EndEdit();
}

void SmCursor::InsertCommandText(const OUString& aCommandText) {
    //Parse the sub expression
    auto xSubExpr = mpDocShell->GetParser()->ParseExpression(aCommandText);

    //Prepare the subtree
    xSubExpr->Prepare(mpDocShell->GetFormat(), *mpDocShell, 0);

    //Convert subtree to list
    SmNode* pSubExpr = xSubExpr.release();
    std::unique_ptr<SmNodeList> pLineList(new SmNodeList);
    NodeToList(pSubExpr, *pLineList);

    BeginEdit();

    //Delete any selection
    Delete();

    //Insert it
    InsertNodes(std::move(pLineList));

    EndEdit();
}

void SmCursor::Copy(vcl::Window* pWindow)
{
    if(!HasSelection())
        return;

    AnnotateSelection();
    //Find selected node
    SmNode* pSNode = FindSelectedNode(mpTree);
    assert(pSNode);
    //Find visual line
    SmNode* pLine = FindTopMostNodeInLine(pSNode, true);
    assert(pLine);

    //Clone selected nodes
    // TODO: Simplify all this cloning since we only need a formula string now.
    SmClipboard aClipboard;
    if(IsLineCompositionNode(pLine))
        CloneLineToClipboard(static_cast<SmStructureNode*>(pLine), &aClipboard);
    else{
        //Special care to only clone selected text
        if(pLine->GetType() == SmNodeType::Text) {
            SmTextNode *pText = static_cast<SmTextNode*>(pLine);
            std::unique_ptr<SmTextNode> pClone(new SmTextNode( pText->GetToken(), pText->GetFontDesc() ));
            int start  = pText->GetSelectionStart(),
                length = pText->GetSelectionEnd() - pText->GetSelectionStart();
            pClone->ChangeText(pText->GetText().copy(start, length));
            pClone->SetScaleMode(pText->GetScaleMode());
            aClipboard.push_front(std::move(pClone));
        } else {
            SmCloningVisitor aCloneFactory;
            aClipboard.push_front(std::unique_ptr<SmNode>(aCloneFactory.Clone(pLine)));
        }
    }

    // Parse list of nodes to a tree
    SmNodeListParser parser;
    SmNode* pTree(parser.Parse(CloneList(aClipboard).get()));

    // Parse the tree to a string
    OUString aString;
    SmNodeToTextVisitor(pTree, aString);

    //Set clipboard
    auto xClipboard(pWindow ? pWindow->GetClipboard() : GetSystemClipboard());
    vcl::unohelper::TextDataObject::CopyStringTo(aString, xClipboard);
}

void SmCursor::Paste(vcl::Window* pWindow)
{
    BeginEdit();
    Delete();

    auto xClipboard(pWindow ? pWindow->GetClipboard() : GetSystemClipboard());
    auto aDataHelper(TransferableDataHelper::CreateFromClipboard(xClipboard));
    if (aDataHelper.GetTransferable().is())
    {
        // TODO: Support MATHML
        auto nId = SotClipboardFormatId::STRING;
        if (aDataHelper.HasFormat(nId))
        {
            OUString aString;
            if (aDataHelper.GetString(nId, aString))
                InsertCommandText(aString);
        }
    }

    EndEdit();
}

std::unique_ptr<SmNodeList> SmCursor::CloneList(SmClipboard &rClipboard){
    SmCloningVisitor aCloneFactory;
    std::unique_ptr<SmNodeList> pClones(new SmNodeList);

    for(auto &xNode : rClipboard){
        SmNode *pClone = aCloneFactory.Clone(xNode.get());
        pClones->push_back(pClone);
    }

    return pClones;
}

SmNode* SmCursor::FindTopMostNodeInLine(SmNode* pSNode, bool MoveUpIfSelected){
    assert(pSNode);
    //Move up parent until we find a node who's
    //parent is NULL or isn't selected and not a type of:
    //      SmExpressionNode
    //      SmLineNode
    //      SmBinHorNode
    //      SmUnHorNode
    //      SmAlignNode
    //      SmFontNode
    while(pSNode->GetParent() &&
          ((MoveUpIfSelected &&
            pSNode->GetParent()->IsSelected()) ||
           IsLineCompositionNode(pSNode->GetParent())))
        pSNode = pSNode->GetParent();
    //Now we have the selection line node
    return pSNode;
}

SmNode* SmCursor::FindSelectedNode(SmNode* pNode){
    if(pNode->GetNumSubNodes() == 0)
        return nullptr;
    for(auto pChild : *static_cast<SmStructureNode*>(pNode))
    {
        if(!pChild)
            continue;
        if(pChild->IsSelected())
            return pChild;
        SmNode* pRetVal = FindSelectedNode(pChild);
        if(pRetVal)
            return pRetVal;
    }
    return nullptr;
}

void SmCursor::LineToList(SmStructureNode* pLine, SmNodeList& list){
    for(auto pChild : *pLine)
    {
        if (!pChild)
            continue;
        switch(pChild->GetType()){
            case SmNodeType::Line:
            case SmNodeType::UnHor:
            case SmNodeType::Expression:
            case SmNodeType::BinHor:
            case SmNodeType::Align:
            case SmNodeType::Font:
                LineToList(static_cast<SmStructureNode*>(pChild), list);
                break;
            case SmNodeType::Error:
                delete pChild;
                break;
            default:
                list.push_back(pChild);
        }
    }
    pLine->ClearSubNodes();
    delete pLine;
}

void SmCursor::CloneLineToClipboard(SmStructureNode* pLine, SmClipboard* pClipboard){
    SmCloningVisitor aCloneFactory;
    for(auto pChild : *pLine)
    {
        if (!pChild)
            continue;
        if( IsLineCompositionNode( pChild ) )
            CloneLineToClipboard( static_cast<SmStructureNode*>(pChild), pClipboard );
        else if( pChild->IsSelected() && pChild->GetType() != SmNodeType::Error ) {
            //Only clone selected text from SmTextNode
            if(pChild->GetType() == SmNodeType::Text) {
                SmTextNode *pText = static_cast<SmTextNode*>(pChild);
                std::unique_ptr<SmTextNode> pClone(new SmTextNode( pChild->GetToken(), pText->GetFontDesc() ));
                int start = pText->GetSelectionStart(),
                    length = pText->GetSelectionEnd() - pText->GetSelectionStart();
                pClone->ChangeText(pText->GetText().copy(start, length));
                pClone->SetScaleMode(pText->GetScaleMode());
                pClipboard->push_back(std::move(pClone));
            } else
                pClipboard->push_back(std::unique_ptr<SmNode>(aCloneFactory.Clone(pChild)));
        }
    }
}

bool SmCursor::IsLineCompositionNode(SmNode const * pNode){
    switch(pNode->GetType()){
        case SmNodeType::Line:
        case SmNodeType::UnHor:
        case SmNodeType::Expression:
        case SmNodeType::BinHor:
        case SmNodeType::Align:
        case SmNodeType::Font:
            return true;
        default:
            return false;
    }
}

int SmCursor::CountSelectedNodes(SmNode* pNode){
    if(pNode->GetNumSubNodes() == 0)
        return 0;
    int nCount = 0;
    for(auto pChild : *static_cast<SmStructureNode*>(pNode))
    {
        if (!pChild)
            continue;
        if(pChild->IsSelected() && !IsLineCompositionNode(pChild))
            nCount++;
        nCount += CountSelectedNodes(pChild);
    }
    return nCount;
}

bool SmCursor::HasComplexSelection(){
    if(!HasSelection())
        return false;
    AnnotateSelection();

    return CountSelectedNodes(mpTree) > 1;
}

void SmCursor::FinishEdit(std::unique_ptr<SmNodeList> pLineList,
                          SmStructureNode* pParent,
                          int nParentIndex,
                          SmCaretPos PosAfterEdit,
                          SmNode* pStartLine) {
    //Store number of nodes in line for later
    int entries = pLineList->size();

    //Parse list of nodes to a tree
    SmNodeListParser parser;
    std::unique_ptr<SmNode> pLine(parser.Parse(pLineList.get()));
    pLineList.reset();

    //Check if we're making the body of a subsup node bigger than one
    if(pParent->GetType() == SmNodeType::SubSup &&
       nParentIndex == 0 &&
       entries > 1) {
        //Wrap pLine in scalable round brackets
        SmToken aTok(TLEFT, '\0', "left", TG::NONE, 5);
        std::unique_ptr<SmBraceNode> pBrace(new SmBraceNode(aTok));
        pBrace->SetScaleMode(SmScaleMode::Height);
        std::unique_ptr<SmNode> pLeft(  CreateBracket(SmBracketType::Round, true) ),
                                pRight( CreateBracket(SmBracketType::Round, false) );
        std::unique_ptr<SmBracebodyNode> pBody(new SmBracebodyNode(SmToken()));
        pBody->SetSubNodes(std::move(pLine), nullptr);
        pBrace->SetSubNodes(std::move(pLeft), std::move(pBody), std::move(pRight));
        pBrace->Prepare(mpDocShell->GetFormat(), *mpDocShell, 0);
        pLine = std::move(pBrace);
        //TODO: Consider the following alternative behavior:
        //Consider the line: A + {B + C}^D lsub E
        //Here pLineList is B, + and C and pParent is a subsup node with
        //both RSUP and LSUB set. Imagine the user just inserted "B +" in
        //the body of the subsup node...
        //The most natural thing to do would be to make the line like this:
        //A + B lsub E + C ^ D
        //E.g. apply LSUB and LSUP to the first element in pLineList and RSUP
        //and RSUB to the last element in pLineList. But how should this act
        //for CSUP and CSUB ???
        //For this reason and because brackets was faster to implement, this solution
        //have been chosen. It might be worth working on the other solution later...
    }

    //Set pStartLine if NULL
    if(!pStartLine)
        pStartLine = pLine.get();

    //Insert it back into the parent
    pParent->SetSubNode(nParentIndex, pLine.release());

    //Rebuild graph of caret position
    mpAnchor = nullptr;
    mpPosition = nullptr;
    BuildGraph();
    AnnotateSelection(); //Update selection annotation!

    //Set caret position
    if(!SetCaretPosition(PosAfterEdit))
        SetCaretPosition(SmCaretPos(pStartLine, 0));

    //End edit section
    EndEdit();
}

void SmCursor::BeginEdit(){
    if(mnEditSections++ > 0) return;

    mbIsEnabledSetModifiedSmDocShell = mpDocShell->IsEnableSetModified();
    if( mbIsEnabledSetModifiedSmDocShell )
        mpDocShell->EnableSetModified( false );
}

void SmCursor::EndEdit(){
    if(--mnEditSections > 0) return;

    mpDocShell->SetFormulaArranged(false);
    //Okay, I don't know what this does... :)
    //It's used in SmDocShell::SetText and with places where everything is modified.
    //I think it does some magic, with sfx, but everything is totally undocumented so
    //it's kinda hard to tell...
    if ( mbIsEnabledSetModifiedSmDocShell )
        mpDocShell->EnableSetModified( mbIsEnabledSetModifiedSmDocShell );
    //I think this notifies people around us that we've modified this document...
    mpDocShell->SetModified();
    //I think SmDocShell uses this value when it sends an update graphics event
    //Anyway comments elsewhere suggests it needs to be updated...
    mpDocShell->mnModifyCount++;

    //TODO: Consider copying the update accessibility code from SmDocShell::SetText in here...
    //This somehow updates the size of SmGraphicView if it is running in embedded mode
    if( mpDocShell->GetCreateMode() == SfxObjectCreateMode::EMBEDDED )
        mpDocShell->OnDocumentPrinterChanged(nullptr);

    //Request a repaint...
    RequestRepaint();

    //Update the edit engine and text of the document
    OUString formula;
    SmNodeToTextVisitor(mpTree, formula);
    mpDocShell->maText = formula;
    mpDocShell->GetEditEngine().QuickInsertText( formula, ESelection( 0, 0, EE_PARA_ALL, EE_TEXTPOS_ALL ) );
    mpDocShell->GetEditEngine().QuickFormatDoc();
}

void SmCursor::RequestRepaint()
{
    if (SmViewShell *pViewSh = SmGetActiveView())
    {
        if (comphelper::LibreOfficeKit::isActive())
        {
            pViewSh->SendCaretToLOK();
        }
        else if ( SfxObjectCreateMode::EMBEDDED == mpDocShell->GetCreateMode() )
            mpDocShell->Repaint();
        else
            pViewSh->GetGraphicWidget().Invalidate();
    }
}

bool SmCursor::IsAtTailOfBracket(SmBracketType eBracketType) const
{
    const SmCaretPos pos = GetPosition();
    if (!pos.IsValid()) {
        return false;
    }

    SmNode* pNode = pos.pSelectedNode;

    if (pNode->GetType() == SmNodeType::Text) {
        SmTextNode* pTextNode = static_cast<SmTextNode*>(pNode);
        if (pos.nIndex < pTextNode->GetText().getLength()) {
            // The cursor is on a text node and at the middle of it.
            return false;
        }
    } else {
        if (pos.nIndex < 1) {
            return false;
        }
    }

    while (true) {
        SmStructureNode* pParentNode = pNode->GetParent();
        if (!pParentNode) {
            // There's no brace body node in the ancestors.
            return false;
        }

        int index = pParentNode->IndexOfSubNode(pNode);
        assert(index >= 0);
        if (static_cast<size_t>(index + 1) != pParentNode->GetNumSubNodes()) {
            // The cursor is not at the tail at one of ancestor nodes.
            return false;
        }

        pNode = pParentNode;
        if (pNode->GetType() == SmNodeType::Bracebody) {
            // Found the brace body node.
            break;
        }
    }

    SmStructureNode* pBraceNodeTmp = pNode->GetParent();
    if (!pBraceNodeTmp || pBraceNodeTmp->GetType() != SmNodeType::Brace) {
        // Brace node is invalid.
        return false;
    }

    SmBraceNode* pBraceNode = static_cast<SmBraceNode*>(pBraceNodeTmp);
    SmMathSymbolNode* pClosingNode = pBraceNode->ClosingBrace();
    if (!pClosingNode) {
        // Couldn't get closing symbol node.
        return false;
    }

    // Check if the closing brace matches eBracketType.
    SmTokenType eClosingTokenType = pClosingNode->GetToken().eType;
    switch (eBracketType) {
    case SmBracketType::Round:        if (eClosingTokenType != TRPARENT)   { return false; } break;
    case SmBracketType::Square:       if (eClosingTokenType != TRBRACKET)  { return false; } break;
    case SmBracketType::Curly:        if (eClosingTokenType != TRBRACE)    { return false; } break;
    default:
        return false;
    }

    return true;
}

/////////////////////////////////////// SmNodeListParser

SmNode* SmNodeListParser::Parse(SmNodeList* list){
    pList = list;
    //Delete error nodes
    SmNodeList::iterator it = pList->begin();
    while(it != pList->end()) {
        if((*it)->GetType() == SmNodeType::Error){
            //Delete and erase
            delete *it;
            it = pList->erase(it);
        }else
            ++it;
    }
    SmNode* retval = Expression();
    pList = nullptr;
    return retval;
}

SmNode* SmNodeListParser::Expression(){
    SmNodeArray NodeArray;
    //Accept as many relations as there is
    while(Terminal())
        NodeArray.push_back(Relation());

    //Create SmExpressionNode, I hope SmToken() will do :)
    SmStructureNode* pExpr = new SmExpressionNode(SmToken());
    pExpr->SetSubNodes(std::move(NodeArray));
    return pExpr;
}

SmNode* SmNodeListParser::Relation(){
    //Read a sum
    std::unique_ptr<SmNode> pLeft(Sum());
    //While we have tokens and the next is a relation
    while(Terminal() && IsRelationOperator(Terminal()->GetToken())){
        //Take the operator
        std::unique_ptr<SmNode> pOper(Take());
        //Find the right side of the relation
        std::unique_ptr<SmNode> pRight(Sum());
        //Create new SmBinHorNode
        std::unique_ptr<SmStructureNode> pNewNode(new SmBinHorNode(SmToken()));
        pNewNode->SetSubNodes(std::move(pLeft), std::move(pOper), std::move(pRight));
        pLeft = std::move(pNewNode);
    }
    return pLeft.release();
}

SmNode* SmNodeListParser::Sum(){
    //Read a product
    std::unique_ptr<SmNode> pLeft(Product());
    //While we have tokens and the next is a sum
    while(Terminal() && IsSumOperator(Terminal()->GetToken())){
        //Take the operator
        std::unique_ptr<SmNode> pOper(Take());
        //Find the right side of the sum
        std::unique_ptr<SmNode> pRight(Product());
        //Create new SmBinHorNode
        std::unique_ptr<SmStructureNode> pNewNode(new SmBinHorNode(SmToken()));
        pNewNode->SetSubNodes(std::move(pLeft), std::move(pOper), std::move(pRight));
        pLeft = std::move(pNewNode);
    }
    return pLeft.release();
}

SmNode* SmNodeListParser::Product(){
    //Read a Factor
    std::unique_ptr<SmNode> pLeft(Factor());
    //While we have tokens and the next is a product
    while(Terminal() && IsProductOperator(Terminal()->GetToken())){
        //Take the operator
        std::unique_ptr<SmNode> pOper(Take());
        //Find the right side of the operation
        std::unique_ptr<SmNode> pRight(Factor());
        //Create new SmBinHorNode
        std::unique_ptr<SmStructureNode> pNewNode(new SmBinHorNode(SmToken()));
        pNewNode->SetSubNodes(std::move(pLeft), std::move(pOper), std::move(pRight));
        pLeft = std::move(pNewNode);
    }
    return pLeft.release();
}

SmNode* SmNodeListParser::Factor(){
    //Read unary operations
    if(!Terminal())
        return Error();
    //Take care of unary operators
    else if(IsUnaryOperator(Terminal()->GetToken()))
    {
        SmStructureNode *pUnary = new SmUnHorNode(SmToken());
        std::unique_ptr<SmNode> pOper(Terminal()),
                                pArg;

        if(Next())
            pArg.reset(Factor());
        else
            pArg.reset(Error());

        pUnary->SetSubNodes(std::move(pOper), std::move(pArg));
        return pUnary;
    }
    return Postfix();
}

SmNode* SmNodeListParser::Postfix(){
    if(!Terminal())
        return Error();
    std::unique_ptr<SmNode> pArg;
    if(IsPostfixOperator(Terminal()->GetToken()))
        pArg.reset(Error());
    else if(IsOperator(Terminal()->GetToken()))
        return Error();
    else
        pArg.reset(Take());
    while(Terminal() && IsPostfixOperator(Terminal()->GetToken())) {
        std::unique_ptr<SmStructureNode> pUnary(new SmUnHorNode(SmToken()) );
        std::unique_ptr<SmNode> pOper(Take());
        pUnary->SetSubNodes(std::move(pArg), std::move(pOper));
        pArg = std::move(pUnary);
    }
    return pArg.release();
}

SmNode* SmNodeListParser::Error(){
    return new SmErrorNode(SmToken());
}

bool SmNodeListParser::IsOperator(const SmToken &token) {
    return  IsRelationOperator(token) ||
            IsSumOperator(token) ||
            IsProductOperator(token) ||
            IsUnaryOperator(token) ||
            IsPostfixOperator(token);
}

bool SmNodeListParser::IsRelationOperator(const SmToken &token) {
    return bool(token.nGroup & TG::Relation);
}

bool SmNodeListParser::IsSumOperator(const SmToken &token) {
    return bool(token.nGroup & TG::Sum);
}

bool SmNodeListParser::IsProductOperator(const SmToken &token) {
    return token.nGroup & TG::Product &&
           token.eType != TWIDESLASH &&
           token.eType != TWIDEBACKSLASH &&
           token.eType != TUNDERBRACE &&
           token.eType != TOVERBRACE &&
           token.eType != TOVER;
}

bool SmNodeListParser::IsUnaryOperator(const SmToken &token) {
    return  token.nGroup & TG::UnOper &&
            (token.eType == TPLUS ||
             token.eType == TMINUS ||
             token.eType == TPLUSMINUS ||
             token.eType == TMINUSPLUS ||
             token.eType == TNEG ||
             token.eType == TUOPER);
}

bool SmNodeListParser::IsPostfixOperator(const SmToken &token) {
    return token.eType == TFACT;
}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */