Skip to content
Navigation Menu
{{ message }}
forked from gigablast/open-source-search-engine
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathDiff.cpp
More file actions
1293 lines (1158 loc) · 34.5 KB
/
Copy pathDiff.cpp
File metadata and controls
1293 lines (1158 loc) · 34.5 KB
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
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "gb-include.h"
#include "Titledb.h"
#include "Diff.h"
// local Debug stuff for diff
#define DPRINTF(format,args...) if ( opt->m_debug > 0 )\
printf("DEBUG: "/**/format, ## args)
#define DPRINTF2(format, args...) if ( opt->m_debug > 1 )\
printf("DEBUG2: "/**/format, ## args)
// element compare functions
int xmlTagCompare(void *elt1, void *elt2);
int xmlTagCompare2(void *elt1, void *elt2);
bool xmlWhitespaceNode(XmlNode *node);
//
int32_t editPath(char *seq1, char *seq2,
const DiffOpt *opt,
const int32_t start1, const int32_t start2,
const int32_t n1, const int32_t n2,
int32_t *midX, int32_t *midY, int32_t *midLen);
int32_t xmlEditPath(Xml *xml1, Xml* xml2,
const DiffOpt *opt,
const int32_t start1, const int32_t start2,
const int32_t n1, const int32_t n2,
int32_t *midX, int32_t *midY, int32_t *midLen);
// Load 2 files into Xml classes and print the output from
// printXmlDiff on them
void diffXmlFiles(char *file1, char *file2, DiffOpt *opt){
int fd = open(file1, O_RDONLY);
if (fd < 0 ) {
fprintf(stderr, "error opening %s\n", file1);
return;
}
int32_t contentLen1 = lseek(fd, 0, SEEK_END);
if (contentLen1 < 0){
fprintf(stderr, "error seeking %s\n", file1);
close(fd);
return;
}
char *content1 = (char*)mmalloc(contentLen1+1, "xmldiff");
if (!content1){
fprintf(stderr, "can't alloc %"INT32" bytes for %s\n",
contentLen1+1, file1);
close(fd);
return;
}
content1[contentLen1] = '\0';
lseek(fd, 0, SEEK_SET);
int32_t n = read(fd, content1, contentLen1);
if (n && n != contentLen1){
fprintf(stderr, "error reading %s: "
"expected %"INT32" bytes got %"INT32".\n"
"(errno=%s)\n",
file1, contentLen1, n, strerror(errno));
return;
}
close(fd);
fd = open(file2, O_RDONLY);
if (fd < 0 ) {
fprintf(stderr, "error opening %s\n", file2);
return;
}
int32_t contentLen2 = lseek(fd, 0, SEEK_END);
if (contentLen2 < 0){
fprintf(stderr, "error seeking %s\n", file2);
close(fd);
return;
}
char *content2 = (char*)mmalloc(contentLen2+1, "xmldiff");
if (!content2){
fprintf(stderr, "can't alloc %"INT32" bytes for %s\n",
contentLen2+1, file2);
close(fd);
return;
}
content2[contentLen2] = '\0';
lseek(fd, 0, SEEK_SET);
n = read(fd, content2, contentLen2);
if (n && n != contentLen2){
fprintf(stderr, "error reading %s: "
"expected %"INT32" bytes got %"INT32".\n"
"(errno=%s)\n",
file2, contentLen2, n, strerror(errno));
return;
}
close(fd);
Xml xml1;
xml1.set(csISOLatin1,
content1,
contentLen1,
false, 0, false,
TITLEREC_CURRENT_VERSION);
Xml xml2;
xml2.set(csISOLatin1,
content2,
contentLen2,
false, 0, false,
TITLEREC_CURRENT_VERSION);
//printf("%s: len=%"INT32", nodes=%"INT32"\n",
// file1, contentLen1, xml1.getNumNodes());
//printf("%s: len=%"INT32", nodes=%"INT32"\n",
// file2, contentLen2, xml2.getNumNodes());
printXmlDiff(&xml1,&xml2, opt);
}
// Run our Xml Diff algorithm on 2 Xmls
void printXmlDiff(Xml *xml1, Xml *xml2, DiffOpt *argOpt){
// Supply default args if necessary
DiffOpt defaultOpt;
DiffOpt *opt = &defaultOpt;
if (argOpt) opt = argOpt;
// set default compare function if necessary
if (!opt->m_compare)
opt->m_compare = xmlTagCompare2;
opt->m_eltSize = sizeof(XmlNode);
int32_t seq1 [4096];
int32_t seq2 [4096];
int32_t seqLen[4096];
SafeBuf buf;
//int32_t numSeq = longestCommonSubsequence(seq1, seq2, seqLen,4096,
// &xml1-> &xml2->;
//printf("lcs length: %"INT32"\n", numSeq);
int32_t numSeq = lcsXml(seq1, seq2, seqLen,4096, xml1, xml2, opt);
//buf.safePrintf("LCS:\nlength: %"INT32"\n", numSeq);
// int32_t start = -1;
// for (int32_t i=0;i<numSeq;i++){
// int32_t i1 = seq1[i];
// int32_t i2 = seq2[i];
// int32_t iLen = seqLen[i];
//buf.safePrintf("node=(%"INT32", %"INT32") len=%"INT32"\n", i1, i2, iLen);
// if (xml1->isUnicode())
// buf.utf16Encode(xml1->getNode(i1),
// xml1->getNodeLen(i1));
// else
// buf.latin1Encode(xml1->getNode(i1),
// xml1->getNodeLen(i1));
// buf.safePrintf("-");
// if (xml1->isUnicode())
// buf.utf16Encode(xml1->getNode(i1+iLen-1),
// xml1->getNodeLen(i1+iLen-1));
// else
// buf.latin1Encode(xml1->getNode(i1+iLen-1),
// xml1->getNodeLen(i1+iLen-1));
// buf.safePrintf("\n");
//if (i < numSeq-1) buf.safePrintf("\n");
// continue;
// }
//buf.safePrintf("\n");
//buf.safePrintf("DIFF:\n");
// Print Diff
int32_t n1 = xml1->getNumNodes();
int32_t n2 = xml2->getNumNodes();
int32_t i = 0;
int32_t j = 0;
int32_t lastC = 0;
for (int32_t seqi=0; i<n1 || j<n2 || seqi<numSeq ; seqi++){
// safe values
int32_t a = n1;
int32_t b = n2;
int32_t len = 0;
int32_t d = 0;
int32_t numEdits = 0;
// node before this common sequence
if (seqi<numSeq){
// stop at next common sequence
a =seq1[seqi];
b = seq2[seqi];
len = seqLen[seqi];
d = b-a;
}
//buf.safePrintf("***** COMMON SEQ %"INT32": (%"INT32"-%"INT32"), (%"INT32"-%"INT32") "
// "a=%"INT32" b=%"INT32" i=%"INT32" j=%"INT32" "
// "len=%"INT32"\n",
// seqi,
// a, a+len-1, b, b+len-1,
// a, b, i, j, len);
//buf.safePrintf("***** COMMON SEQ %"INT32": "
// "(%"INT32"-%"INT32"), (%"INT32"-%"INT32") *****\n",
// seqi,
// a, a+len-1, b, b+len-1);
if (i<a || j<b){
int32_t editLoc = i;
// print location, in first file,
// of the following edits
// but only if context tags have not caught up
if (editLoc > lastC){
char name[1024];
name[0] = '\0';
int32_t namelen = 0;
//namelen = xml1->getCompoundName
// (editLoc,name,1024);
buf.safePrintf("@@@ node %"INT32": ",
editLoc);
if(xml1->isUnicode())
buf.utf16Encode(name,namelen);
else
buf.latin1Encode(name,namelen);
buf.safePrintf("\n");
}
// leading context
int32_t c = i;
// go back opt->m_context nodes, skipping empty tags,
// go back as far as the first node, or
// the last node that was output as trailing context
for (int32_t x=i-1, numTags = 0;
x >= 0 && numTags < opt->m_context && x > lastC;
x--){
if (xmlWhitespaceNode(xml1->getNodePtr(x)))
continue;
numTags++;
c = x;
}
for ( ; c < i ; c++) {
// char name[1024];
// int32_t namelen = xml1->getCompoundName
// (c,name,1024);
// if (namelen)
// buf.safePrintf("- %"INT32": %s\n",c,name);
//buf.safePrintf(" (node %6li) \t| ", c);
if (xmlWhitespaceNode(xml1->getNodePtr(c)))
continue;
char *s = xml1->getNode(c);
int32_t slen = xml1->getNodeLen(c);
if (xml1->isUnicode())
buf.utf16Encode(s,slen);
else buf.latin1Encode(s,slen);
//lastC = c;
}
if (c>lastC) buf.safePrintf("\n");
//buf.safePrintf("-------------------------\n");
}
// Deletes
if (i<a){
buf.safePrintf("-------------------------\n");
//buf.safePrintf("<<<<<<<<<<<<<<<<<<<<<<<<<\n");
//buf.safePrintf("- (node %6li-%"INT32") \t| ", i,a-1);
buf.safePrintf("--- (node %"INT32"-%"INT32")\n", i,a-1);
while (i < a){
char *s = xml1->getNode(i);
int32_t slen = xml1->getNodeLen(i);
if (xml1->isUnicode())
buf.utf16Encode(s,slen);
else buf.latin1Encode(s,slen);
i++;
numEdits++;
}
buf.safePrintf("\n");
//buf.safePrintf("\n");
buf.safePrintf("-------------------------\n");
}
// Adds
if (j<b){
buf.safePrintf("+++++++++++++++++++++++++\n");
//buf.safePrintf("-------------------------\n");
//buf.safePrintf(">>>>>>>>>>>>>>>>>>>>>>>>>\n");
//buf.safePrintf("+ (node %6li-%"INT32") \t| ", j,b-1);
buf.safePrintf("+++ (node %"INT32"-%"INT32")\n", j,b-1);
while (j < b){
char *s = xml2->getNode(j);
int32_t slen = xml2->getNodeLen(j);
if (xml2->isUnicode())
buf.utf16Encode(s,slen);
else buf.latin1Encode(s,slen);
j++;
numEdits++;
}
buf.safePrintf("\n");
buf.safePrintf("+++++++++++++++++++++++++\n");
}
int32_t c = a;
// skip if there were no diffs...sometimes we get
// 2 consecutive sequences of common nodes, dunno why
if (numEdits == 0) goto skipTrail;
//buf.safePrintf("-------------------------\n");
if (lastC < a) lastC = a;
// trailing context
for ( int32_t numTags = 0;
numTags < opt->m_context && c < a+len ; c++) {
lastC = c;
if (xmlWhitespaceNode(xml1->getNodePtr(c)))
continue;
numTags++;
char *s = xml1->getNode(c);
int32_t slen = xml1->getNodeLen(c);
if (xml1->isUnicode())
buf.utf16Encode(s,slen);
else buf.latin1Encode(s,slen);
}
buf.safePrintf("\n");
skipTrail:
if (opt->m_context <= 0)
buf.safePrintf(" (node %"INT32"-%"INT32", %"INT32"-%"INT32")\n",
a, a+len-1, b, b+len-1);
// skip past common nodes
if (i == a) i+=len;
if (j == b) j+=len;
}
//buf.safePrintf("\n");
buf.print();
}
// a linear space version of LCS/diff algorithm described at
// http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.4.6927
// The algorithm works by imagining the elements of the 2 sequences
// as X and Y nodes on a graph. A vertical or horizontal edge between nodes
// corresponds to adding or deleting an element, while a diagonal edge
// is a common element between the two.
// The int16_test path from (0,0) to (n1, n2) corresponds to the (an)
// optimal diff (int16_test edit script) between the sequences, and the
// diagonal edges on that path represent a Longest Common Subsequence.
// This recursive version finds a path forward from the start and backward
// from the end. When they overlap in the middle, we've found the middlemost
// match (or edit)
// Max number of edits/diffs
#define MAXD 10000
#if 0
int32_t lcsXml(int32_t *lcsBuf1, // xml1 indexes of nodes in lcs
int32_t *lcsBuf2, // xml2 indexes of nodes in lcs
int32_t *lcsLenBuf, // number of consecutive nodes in each lcsBuf
int32_t lcsBufLen, // max number of sequence matches we can fit
Xml *xml1, Xml *xml2,
const DiffOpt *opt,
const int32_t argStart1, const int32_t argStart2, // index of start nodes
const int32_t argN1, const int32_t argN2, // limit on number of nodes
const int32_t rlevel){
// return value...length of overall lcs
int32_t len = 0;
int32_t start1 = argStart1;
int32_t start2 = argStart2;
int32_t n1 = argN1;
int32_t n2 = argN2;
if (n1 < 0) n1 = xml1->getNumNodes() - start1;
if (n2 < 0) n2 = xml2->getNumNodes() - start2;
XmlNode *nodes1 = xml1->getNodes();
XmlNode *nodes2 = xml2->getNodes();
if (opt->m_debug){
for (int32_t i=0;i<rlevel;i++) printf("\t");
printf("lcsXml(%"INT32"): [%"INT32" - %"INT32"] (%"INT32"), [%"INT32" - %"INT32"] (%"INT32") \n",
rlevel,
start1, start1+n1-1, n1,
start2, start2+n2-1, n2);
}
if (lcsBufLen <= 0) return 0;
if (n1 <= 0 || n2 <= 0) return 0;
int32_t *p1 = lcsBuf1;
int32_t *p2 = lcsBuf2;
int32_t *pLen = lcsLenBuf;
// First, find any common prefix
int32_t prefixLen = 0;
for ( int32_t i=0 ; i < n1 && i < n2 ; i++){
//if (xmlNodeCompare(xml1, start1 + i,
// xml2, start2 + i, opt) != 0)
if (xmlTagCompare(&nodes1[start1 + i],
&nodes2[start2 + i]) != 0)
break;
prefixLen++;
}
if (prefixLen > 0){
// store it in result
*p1++ = start1;
*p2++ = start2;
*pLen++ = prefixLen;
len++;
// remove from input
start1 += prefixLen;
start2 += prefixLen;
n1 -= prefixLen;
n2 -= prefixLen;
}
// optimization no further match possible
if (n1 <= 0 || n2 <= 0) {
if (opt->m_debug){
for (int32_t i=0;i<rlevel;i++) printf("\t");
printf("len=%"INT32"\n",len);
}
return len;
}
// find any common suffix too
int32_t suffixLen = 0;
for ( int32_t i=0 ; i < n1 && i < n2 ; i++){
//if (xmlNodeCompare(xml1, start1+n1-1 - i,
// xml2, start2+n2-1 - i, opt) != 0)
if (xmlTagCompare(&nodes1[start1+n1-1 - i],
&nodes2[start2+n2-1 - i]) != 0)
break;
suffixLen++;
}
if (suffixLen > 0){
// remove from input
n1 -= suffixLen;
n2 -= suffixLen;
}
int32_t mid1=0, mid2=0, midLen=0;
int32_t pathLen = 0;
// optimization: no possible matches
if (n1+n2 <= 3)
pathLen = n1+n2;
else {
if (opt->m_debug){
for (int32_t i=0;i<rlevel;i++) printf("\t");
DPRINTF("editPath: [%"INT32" - %"INT32"] (%"INT32"), "
"[%"INT32" - %"INT32"] (%"INT32")\n",
start1, start1+n1, n1,
start2, start2+n2, n2);
}
pathLen = xmlEditPath(xml1, xml2, opt,
start1, start2, n1, n2,
&mid1, &mid2, &midLen);
if (opt->m_debug){
for (int32_t i=0;i<rlevel;i++) printf("\t");
DPRINTF("editPath -> [%"INT32" - %"INT32"] (%"INT32"), "
"[%"INT32" - %"INT32"] (%"INT32")\n",
mid1, mid1+midLen-1, midLen,
mid2, mid2+midLen-1, midLen);
}
}
If (pathLen < 0) {
log(LOG_WARN, "Diff: Error finding int16_test diff");
return -1;
}
// All nodes different
if ( pathLen >= n1 + n2 ){
// Add the suffix
if (suffixLen > 0 && len < lcsBufLen){
*p1++ = start1+n1;
*p2++ = start2+n2;
*pLen++ = suffixLen;
if (opt->m_debug){
for (int32_t i=0;i<rlevel;i++) printf("\t");
printf("suffix lcs += (%"INT32"-%"INT32"),(%"INT32"-%"INT32")\n",
start1, start1+n1-1,
start2, start2+n2-1);
}
len++;
}
if (opt->m_debug){
for (int32_t i=0;i<rlevel;i++) printf("\t");
printf("len=%"INT32"\n",len);
}
return len;
}
if (pathLen > 1){
// Recurse on the first half
if (opt->m_debug){
for (int32_t i=0;i<rlevel;i++) printf("\t");
printf("Recurse left:\n");
}
int32_t n = lcsXml(p1, p2,pLen,lcsBufLen-len,
xml1, xml2, opt,
start1, start2,
mid1-start1, mid2-start2,
rlevel+1);
if (n<0) return -1;
p1 += n;
p2 += n;
pLen += n;
len += n;
if (opt->m_debug){
for (int32_t i=0;i<rlevel;i++) printf("\t");
printf("left len=%"INT32"\n", n);
}
// add middle common sequence
if ( len < lcsBufLen && midLen > 0){
*p1++ = mid1;
*p2++ = mid2;
*pLen++ = midLen;
if (opt->m_debug){
for (int32_t i=0;i<rlevel;i++) printf("\t");
printf("middle lcs += (%"INT32"-%"INT32"),(%"INT32"-%"INT32")\n",
mid1, mid1+midLen-1,
mid2, mid2+midLen-1);
}
len++;
}
// Recurse on the second half
if (opt->m_debug){
for (int32_t i=0;i<rlevel;i++) printf("\t");
printf("Recurse right:\n");
}
n = lcsXml(p1, p2,pLen,lcsBufLen-len,
xml1, xml2, opt,
mid1+midLen, mid2+midLen,
start1+n1 - (mid1+midLen),
start2+n2 - (mid2+midLen),
rlevel+1);
if (n<0) return -1;
p1 += n;
p2 += n;
pLen += n;
len += n;
if (opt->m_debug){
for (int32_t i=0;i<rlevel;i++) printf("\t");
printf("right len=%"INT32"\n", n);
}
}
// edit path length of 1 or less means at most 1 node was
// added or deleted...since we've already removed the common prefix,
// the extra node should be at the beginning of one of the sequences
else {
if (n1 > n2){
// remove extra node from xml1
//if (xmlNodeCompare(xml1, start1 , xml2, start2,
// opt ))
start1++;
n1--;
}
else if (n2 > n1){
// remove extra node from xml2
//if (xmlNodeCompare(xml1, start1 , xml2, start2,
//opt ))
start2++;
n2--;
}
// sanity check
if ( n1 != n2) {
log(LOG_WARN, "Diff: PANIC! Sequences do not match! "
"n1=%"INT32" n2=%"INT32"", n1, n2);
char *xx = NULL; *xx=0;
}
if ( len < lcsBufLen && n1 > 0 && n2 > 0) {
*p1++ = start1;
*p2++ = start2;
*pLen++ = n1;
if (opt->m_debug){
for (int32_t i=0;i<rlevel;i++) printf("\t");
printf("end lcs += (%"INT32"-%"INT32"),(%"INT32"-%"INT32")\n",
start1, start1+n1-1,
start2, start2+n2-1);
}
len++;
}
}
// Add the suffix
if (suffixLen > 0 && len < lcsBufLen){
*p1++ = start1+n1;
*p2++ = start2+n2;
*pLen++ = suffixLen;
if (opt->m_debug){
for (int32_t i=0;i<rlevel;i++) printf("\t");
printf("suffix lcs += (%"INT32"-%"INT32"),(%"INT32"-%"INT32")\n",
start1, start1+n1-1,
start2, start2+n2-1);
}
len++;
}
if (opt->m_debug){
for (int32_t i=0;i<rlevel;i++) printf("\t");
printf("len=%"INT32"\n",len);
}
return len;
// compact the sequences
int32_t newLen = len;
for (int32_t i=1, j=0;i<len;i++){
if ( i <= j ) continue;
if ( lcsBuf1[i] != lcsBuf1[j] + lcsLenBuf[j] ||
lcsBuf2[i] != lcsBuf2[j] + lcsLenBuf[j] ) {
j++;
if ( i <= j ) continue;
//fill hole
lcsBuf1[j]=lcsBuf1[i];
lcsBuf2[j]=lcsBuf2[i];
lcsLenBuf[j]=lcsLenBuf[i];
}
// merge consecutive sequences
lcsLenBuf[j] += lcsLenBuf[i];
newLen--;
}
return newLen;
}
#else
int32_t lcsXml(int32_t *lcsBuf1, // xml1 indexes of nodes in lcs
int32_t *lcsBuf2, // xml2 indexes of nodes in lcs
int32_t *lcsLenBuf, // number of consecutive nodes in each lcsBuf
int32_t lcsBufLen, // max number of sequence matches we can fit
Xml *xml1, Xml *xml2,
DiffOpt *opt,
const int32_t argStart1,
const int32_t argStart2, // index of start nodes
const int32_t argN1,
const int32_t argN2, // limit on number of nodes
const int32_t rlevel){
XmlNode *nodes1 = xml1->getNodes();
XmlNode *nodes2 = xml2->getNodes();
int32_t start1 = argStart1;
int32_t start2 = argStart2;
int32_t n1 = argN1;
int32_t n2 = argN2;
if (n1<0) n1 = xml1->getNumNodes();
if (n2<0) n2 = xml2->getNumNodes();
return longestCommonSubseq(lcsBuf1, lcsBuf2, lcsLenBuf,lcsBufLen,
(char*)nodes1, (char*)nodes2, opt,
start1, start2, n1, n2,rlevel);
}
#endif
int64_testCommonSubseq(int32_t *outbuf1, // out1 indexes of nodes in lcs
int32_t *outbuf2, // xml2 indexes of nodes in lcs
int32_t *outlens, // number of consecutive nodes lcsBuf
int32_t outbuflen, // Size of output bufs (elts not bytes)
char *seq1,
char *seq2,
const DiffOpt *opt,
const int32_t argStart1, // index of first elements
const int32_t argStart2,
const int32_t argN1, // element count in seq 1 and seq2
const int32_t argN2,
const int32_t rlevel){
// return value...length of overall lcs
int32_t len = 0;
int32_t start1 = argStart1;
int32_t start2 = argStart2;
int32_t n1 = argN1;
int32_t n2 = argN2;
if (opt->m_debug){
for (int32_t i=0;i<rlevel;i++) printf("\t");
printf("longestCommonSubseq(%"INT32"): [%"INT32" , %"INT32"] [%"INT32" , %"INT32"] \n",
rlevel,start1, start1+n1-1, start2, start2+n2-1);
}
// no space
if (outbuflen <= 0) return -1;
// no input
if (n1 <= 0 || n2 <= 0) return 0;
int32_t *p1 = outbuf1;
int32_t *p2 = outbuf2;
int32_t *pLen = outlens;
// First, find any common prefix
int32_t prefixLen = 0;
for ( int32_t i=0 ; i < n1 && i < n2 ; i++){
char *e1 = seq1+(start1+i)*opt->m_eltSize;
char *e2 = seq2+(start2+i)*opt->m_eltSize;
if (opt->m_compare(e1, e2) != 0)
break;
prefixLen++;
}
if (prefixLen > 0){
// store it in result
*p1++ = start1;
*p2++ = start2;
*pLen++ = prefixLen;
if (opt->m_debug){
for (int32_t i=0;i<rlevel;i++) printf("\t");
printf("prefix lcs += (%"INT32"-%"INT32"),(%"INT32"-%"INT32")\n",
start1, start1+n1-1,
start2, start2+n2-1);
}
len++;
// remove from input
start1 += prefixLen;
start2 += prefixLen;
n1 -= prefixLen;
n2 -= prefixLen;
}
// no further match possible
if (n1 <= 0 || n2 <= 0) return len;
// find any common suffix too
int32_t suffixLen = 0;
for ( int32_t i=0 ; i < n1 && i < n2 ; i++){
char *e1 = seq1+(start1+n1-1-i)*opt->m_eltSize;
char *e2 = seq2+(start2+n2-1-i)*opt->m_eltSize;
if (opt->m_compare(e1, e2) != 0)
break;
suffixLen++;
}
if (suffixLen > 0){
// remove from input
n1 -= suffixLen;
n2 -= suffixLen;
}
int32_t mid1=0, mid2=0, midLen=0;
int32_t pathLen = 0;
if (n1+n2 <= 3)
// No matches possible
pathLen = n1+n2;
else
pathLen = editPath(seq1, seq2, opt,
start1, start2, n1, n2,
&mid1, &mid2, &midLen);
if (pathLen < 0) {
log(LOG_WARN, "Diff: Error finding int16_test diff");
return -1;
}
// All nodes different
if ( pathLen >= n1 + n2 ){
// Add the suffix
if (suffixLen > 0 && len < outbuflen){
*p1++ = start1+n1;
*p2++ = start2+n2;
*pLen++ = suffixLen;
if (opt->m_debug){
for (int32_t i=0;i<rlevel;i++) printf("\t");
printf("suffix lcs += (%"INT32"-%"INT32"),(%"INT32"-%"INT32")\n",
start1, start1+n1-1,
start2, start2+n2-1);
}
len++;
}
return len;
}
if (pathLen > 1){
// Recurse on the first half
if (opt->m_debug){
for (int32_t i=0;i<rlevel;i++) printf("\t");
printf("Recurse left:\n");
}
int32_t n = longestCommonSubseq(p1, p2,pLen,outbuflen-len,
seq1, seq2, opt,
start1, start2,
mid1-start1, mid2-start2,
rlevel+1);
if (n<0) return -1;
p1 += n;
p2 += n;
pLen += n;
len += n;
// add middle common sequence
if ( len < outbuflen && midLen > 0){
*p1++ = mid1;
*p2++ = mid2;
*pLen++ = midLen;
if (opt->m_debug){
for (int32_t i=0;i<rlevel;i++) printf("\t");
printf("middle lcs += (%"INT32"-%"INT32"),(%"INT32"-%"INT32")\n",
start1, start1+n1-1,
start2, start2+n2-1);
}
len++;
}
// Recurse on the second half
if (opt->m_debug){
for (int32_t i=0;i<rlevel;i++) printf("\t");
printf("Recurse right:\n");
}
n = longestCommonSubseq(p1, p2,pLen,outbuflen-len,
seq1, seq2, opt,
mid1+midLen, mid2+midLen,
start1+n1 - (mid1+midLen),
start2+n2 - (mid2+midLen),
rlevel+1);
if (n<0) return -1;
p1 += n;
p2 += n;
pLen += n;
len += n;
}
// edit path length of 1 or less means at most 1 node was
// added or deleted...since we've already removed the common prefix,
// the extra node should be at the beginning of one of the sequences
else {
if (n1 > n2){
start1++;
n1--;
}
if (n2 > n1){
start2++;
n2--;
}
// sanity check
if ( n1 != n2) {
log(LOG_WARN, "Diff: PANIC! Sequences do not match! "
"n1=%"INT32" n2=%"INT32"", n1, n2);
char *xx = NULL; *xx=0;
}
if ( len < outbuflen && n1 > 0 && n2 > 0) {
*p1++ = start1;
*p2++ = start2;
*pLen++ = n1;
if (opt->m_debug){
for (int32_t i=0;i<rlevel;i++) printf("\t");
printf("end lcs += (%"INT32"-%"INT32"),(%"INT32"-%"INT32")\n",
start1, start1+n1-1,
start2, start2+n2-1);
}
len++;
}
}
// Add the suffix
if (suffixLen > 0 && len < outbuflen){
*p1++ = start1+n1;
*p2++ = start2+n2;
*pLen++ = suffixLen;
if (opt->m_debug){
for (int32_t i=0;i<rlevel;i++) printf("\t");
printf("suffix lcs += (%"INT32"-%"INT32"),(%"INT32"-%"INT32")\n",
start1, start1+n1-1,
start2, start2+n2-1);
}
len++;
}
return len;
// compact the sequences
//int32_t newLen = len;
//for (int32_t i=1, j=0;i<len;i++){
// if ( i <= j ) continue;
// if ( lcsBuf1[i] != lcsBuf1[j] + lcsLenBuf[j] ||
// lcsBuf2[i] != lcsBuf2[j] + lcsLenBuf[j] ) {
// j++;
// if ( i <= j ) continue;
//fill hole
// lcsBuf1[j]=lcsBuf1[i];
// lcsBuf2[j]=lcsBuf2[i];
// lcsLenBuf[j]=lcsLenBuf[i];
// }
// // merge consecutive sequences
// lcsLenBuf[j] += lcsLenBuf[i];
// newLen--;
//}
//return newLen;
}
// access negative array index
#define IDX(asize, idx) ( ((idx)<0) ? ((asize)+(idx)) : (idx) )
#define VSIZE (2*MAXD+1)
// This will return the length of the int16_test edit path between
// xml1(start1, n1 nodes) and xml2(start2, n2 nodes),
// return the middle "snake" (matching nodes) in mid[XYUV] if one exists
int32_t xmlEditPath(Xml *xml1, Xml* xml2,
const DiffOpt *opt,
const int32_t start1, const int32_t start2,
const int32_t n1, const int32_t n2,
int32_t *midX, int32_t *midY, int32_t *midLen){
XmlNode *nodes1 = xml1->getNodes();
XmlNode *nodes2 = xml2->getNodes();
int32_t v1[VSIZE];
int32_t v2[VSIZE];
int32_t delta = n1-n2;
// the algorithm terminates on a reverse iteration if the difference
// in length is even
bool reverseFinish = (delta % 2 == 0);
int32_t maxD = n1+n2;
// round up
if (maxD % 2) maxD++;
maxD /= 2;
if (maxD>MAXD) maxD = MAXD;
v1[1] = 0;
v2[1] = n1;
*midLen = 0;
//DPRINTF("xmlEditPath: maxD:%"INT32" delta:%"INT32" "
//"s1:%"INT32" s2:%"INT32" n1:%"INT32" n2:%"INT32"\n",
DPRINTF2("xmlEditPath: maxD:%"INT32" delta:%"INT32" "
"[%"INT32" - %"INT32"] (%"INT32"), "
"[%"INT32" - %"INT32"] (%"INT32")\n",
maxD, delta,
start1, start1+n1-1, n1,
start2, start2+n2-1, n2);
for (int32_t d=0 ; d <= maxD ; d++ ){
DPRINTF2("D: %"INT32" forward\n", d);
//find forward path
for (int32_t k = -d ; k <= d ; k += 2) {
DPRINTF2("\tK: %"INT32"\n", k);
// get best endpoints of last iteration
int32_t a = v1[IDX(VSIZE, k-1)];
int32_t b = v1[IDX(VSIZE, k+1)];
int32_t x;
// select best path along diagonal k
if (k == -d || k != d && a < b) x = b;
else x = a+1;
int32_t y = x-k;
// DPRINTF2("\t\tx=%"INT32" y=%"INT32"\n",x,y);
int32_t startX = x;
int32_t startY = y;
// follow any matched nodes
while (x >=0 && x < n1 &&
y >= 0 && y < n2 &&
//!xmlNodeCompare(xml1, x + start1 ,
// xml2, y + start2, opt )){
!xmlTagCompare(&nodes1[ x + start1 ],
&nodes2[ y + start2 ] )){
x++;
y++;
// DPRINTF2("\t\tx=%"INT32" y=%"INT32"\n",x,y);
}
// store best endpoint for this iteration
v1[IDX(VSIZE,k)] = x;
// store last match
if (startX != x){
*midX = startX + start1;
*midY = startY + start2;
*midLen = x - startX;
}
// check if odd
//if (delta % 2 == 0) continue;
if (reverseFinish) continue;
// out of range for overlap
if (k < delta-(d-1) || k > delta+(d-1)) continue;
// check for overlap with reverse path
int32_t j = -k+delta;
int32_t u = v2[IDX(VSIZE,j)];
int32_t v = u + j - delta;
if (x-y != u-v || x < u) continue;
// found middle match...add the start offsets
DPRINTF2("FORWARD MATCH: x=%"INT32" y=%"INT32" u=%"INT32" v=%"INT32"\n",
x, y, u, v);
DPRINTF2("pathlen=%"INT32" midX=%"INT32" midY=%"INT32" midLen=%"INT32"\n",
2*d-1,*midX, *midY, *midLen);
// return length of SES
return 2*d-1;
}
DPRINTF2("D: %"INT32" reverse\n",d);
// find reverse path
for (int32_t k = -d ; k <= d ; k += 2) {
DPRINTF2("\tK: %"INT32"\n", k);
int32_t a = v2[IDX(VSIZE, k-1)];
int32_t b = v2[IDX(VSIZE, k+1)];
int32_t u;
// select best path along diagonal k
if (k == -d || k != d && a > b) u = b;
else u = a-1;
You can’t perform that action at this time.