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add string diff via LCS

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This commit is contained in:
Dennis Eichhorn 2022-09-16 23:30:32 +02:00
parent cf847cbfc9
commit 6fc850f1e6
1 changed files with 109 additions and 0 deletions
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109
Utils/StringUtils.h
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@ -13,6 +13,9 @@
#include <stdio.h>
#include <ctype.h>
#include "MathUtils.h"
#include "ArraySort.h"
namespace Utils {
class StringUtils {
private:
@ -31,6 +34,112 @@ namespace Utils {
return true;
}
typedef struct {
char **values;
int *masks;
int size;
} text_diff;
static
text_diff computeLCSDiff (char **from, int fromSize, char **to, int toSize)
{
char **diffValues = malloc(fromSize * toSize * sizeof(char *));
int *diffMasks = calloc(fromSize * toSize, sizeof(int));
int *dm = calloc((fromSize + 1) * (toSize + 1), sizeof(int));
if (!diffValues || !diffMasks || !dm) {
fprintf(stderr, "CRITICAL: malloc failed");
}
int i = 0;
int j = 0;
/* Handled with calloc
for (j = 0; j <= toSize; ++j) {
dm[0 + j] = 0;
}
for (i = 1; i <= fromSize; ++i) {
dm[i * fromSize + 0] = 0;
}
*/
for (i = 1; i <= fromSize; ++i) {
for (j = 1; j <= toSize; ++j) {
dm[i * fromSize + j] = strcmp(from[i - 1], to[j - 1]) == 0
? dm[(i - 1) * fromSize + (j - 1)] + 1
: oms_max(dm[(i - 1) * fromSize + j], dm[i * fromSize + (j - 1)]);
}
}
int diffIndex = 0;
i = fromSize;
j = toSize;
while (i > 0 || j > 0) {
if (j > 0 && dm[i * fromSize + (j - 1)] == dm[i * fromSize + j]) {
diffValues[diffIndex] = malloc((strlen(to[j - 1]) + 1) * sizeof(char));
if (!diffValues[diffIndex]) {
fprintf(stderr, "CRITICAL: malloc failed");
}
strcpy(diffValues[diffIndex], to[j - 1]);
diffMasks[diffIndex] = 1;
--j;
++diffIndex;
continue;
}
if (i > 0 && dm[(i - 1) * fromSize + j] == dm[i * fromSize + j]) {
diffValues[diffIndex] = malloc((strlen(from[i - 1]) + 1) * sizeof(char));
if (!diffValues[diffIndex]) {
fprintf(stderr, "CRITICAL: malloc failed");
}
strcpy(diffValues[diffIndex], from[i - 1]);
diffMasks[diffIndex] = -1;
--i;
++diffIndex;
continue
}
diffValues[diffIndex] = malloc((strlen(from[i - 1]) + 1) * sizeof(char));
if (!diffValues[diffIndex]) {
fprintf(stderr, "CRITICAL: malloc failed");
}
strcpy(diffValues[diffIndex], from[i - 1]);
/* Handled with calloc
diffMasks[diffIndex] = 0;
*/
--i;
--j;
++diffIndex;
}
free(dm);
diffValues = realloc(diffValues, diffIndex * sizeof(char *));
diffMasks = realloc(diffMasks, diffIndex * sizeof(int));
if (!diffValues || !diffMasks) {
fprintf(stderr, "CRITICAL: malloc failed");
}
ArraySort::reverse_char(diffValues, diffIndex);
ArraySort::reverse_int(diffMasks, diffIndex);
return text_diff { diffValues, diffMasks, diffIndex };
}
};
}