mirror of
https://gitea.quitesimple.org/crtxcr/cgitsb
synced 2024-11-23 12:42:19 +01:00
735e15e38a
Refuses to do so if the left hand side of the diff has different amount of differing lines to the right hand side to avoid confusion. Note that I use the naive dynamic programming approach for calculating the longest common subsequence. We could probably be more efficient by using a better algorithm. The LCS calculating function is O(n*m) and uses up n*m amount of memory too (so if we we compare two strings of length 100, I use an array of 10000 for calculating the LCS). Might want to not calculate LCS if the length of the line is too large. Signed-off-by: Ragnar Ouchterlony <ragnar@lysator.liu.se>
370 lines
7.8 KiB
C
370 lines
7.8 KiB
C
#include "cgit.h"
|
|
#include "html.h"
|
|
#include "ui-shared.h"
|
|
|
|
extern int use_ssdiff;
|
|
|
|
static int current_old_line, current_new_line;
|
|
|
|
struct deferred_lines {
|
|
int line_no;
|
|
char *line;
|
|
struct deferred_lines *next;
|
|
};
|
|
|
|
static struct deferred_lines *deferred_old, *deferred_old_last;
|
|
static struct deferred_lines *deferred_new, *deferred_new_last;
|
|
|
|
static char *longest_common_subsequence(char *A, char *B)
|
|
{
|
|
int i, j, ri;
|
|
int m = strlen(A);
|
|
int n = strlen(B);
|
|
int L[m + 1][n + 1];
|
|
int tmp1, tmp2;
|
|
int lcs_length;
|
|
char *result;
|
|
|
|
for (i = m; i >= 0; i--) {
|
|
for (j = n; j >= 0; j--) {
|
|
if (A[i] == '\0' || B[j] == '\0') {
|
|
L[i][j] = 0;
|
|
} else if (A[i] == B[j]) {
|
|
L[i][j] = 1 + L[i + 1][j + 1];
|
|
} else {
|
|
tmp1 = L[i + 1][j];
|
|
tmp2 = L[i][j + 1];
|
|
L[i][j] = (tmp1 > tmp2 ? tmp1 : tmp2);
|
|
}
|
|
}
|
|
}
|
|
|
|
lcs_length = L[0][0];
|
|
result = xmalloc(lcs_length + 2);
|
|
memset(result, 0, sizeof(*result) * (lcs_length + 2));
|
|
|
|
ri = 0;
|
|
i = 0;
|
|
j = 0;
|
|
while (i < m && j < n) {
|
|
if (A[i] == B[j]) {
|
|
result[ri] = A[i];
|
|
ri += 1;
|
|
i += 1;
|
|
j += 1;
|
|
} else if (L[i + 1][j] >= L[i][j + 1]) {
|
|
i += 1;
|
|
} else {
|
|
j += 1;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static int line_from_hunk(char *line, char type)
|
|
{
|
|
char *buf1, *buf2;
|
|
int len;
|
|
|
|
buf1 = strchr(line, type);
|
|
if (buf1 == NULL)
|
|
return 0;
|
|
buf1 += 1;
|
|
buf2 = strchr(buf1, ',');
|
|
if (buf2 == NULL)
|
|
return 0;
|
|
len = buf2 - buf1;
|
|
buf2 = xmalloc(len + 1);
|
|
strncpy(buf2, buf1, len);
|
|
buf2[len] = '\0';
|
|
int res = atoi(buf2);
|
|
free(buf2);
|
|
return res;
|
|
}
|
|
|
|
static char *replace_tabs(char *line)
|
|
{
|
|
char *prev_buf = line;
|
|
char *cur_buf;
|
|
int linelen = strlen(line);
|
|
int n_tabs = 0;
|
|
int i;
|
|
char *result;
|
|
char *spaces = " ";
|
|
|
|
if (linelen == 0) {
|
|
result = xmalloc(1);
|
|
result[0] = '\0';
|
|
return result;
|
|
}
|
|
|
|
for (i = 0; i < linelen; i++)
|
|
if (line[i] == '\t')
|
|
n_tabs += 1;
|
|
result = xmalloc(linelen + n_tabs * 8 + 1);
|
|
result[0] = '\0';
|
|
|
|
while (1) {
|
|
cur_buf = strchr(prev_buf, '\t');
|
|
if (!cur_buf) {
|
|
strcat(result, prev_buf);
|
|
break;
|
|
} else {
|
|
strcat(result, " ");
|
|
strncat(result, spaces, 8 - (strlen(result) % 8));
|
|
strncat(result, prev_buf, cur_buf - prev_buf);
|
|
}
|
|
prev_buf = cur_buf + 1;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static int calc_deferred_lines(struct deferred_lines *start)
|
|
{
|
|
struct deferred_lines *item = start;
|
|
int result = 0;
|
|
while (item) {
|
|
result += 1;
|
|
item = item->next;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static void deferred_old_add(char *line, int line_no)
|
|
{
|
|
struct deferred_lines *item = xmalloc(sizeof(struct deferred_lines));
|
|
item->line = xstrdup(line);
|
|
item->line_no = line_no;
|
|
item->next = NULL;
|
|
if (deferred_old) {
|
|
deferred_old_last->next = item;
|
|
deferred_old_last = item;
|
|
} else {
|
|
deferred_old = deferred_old_last = item;
|
|
}
|
|
}
|
|
|
|
static void deferred_new_add(char *line, int line_no)
|
|
{
|
|
struct deferred_lines *item = xmalloc(sizeof(struct deferred_lines));
|
|
item->line = xstrdup(line);
|
|
item->line_no = line_no;
|
|
item->next = NULL;
|
|
if (deferred_new) {
|
|
deferred_new_last->next = item;
|
|
deferred_new_last = item;
|
|
} else {
|
|
deferred_new = deferred_new_last = item;
|
|
}
|
|
}
|
|
|
|
static void print_part_with_lcs(char *class, char *line, char *lcs)
|
|
{
|
|
int line_len = strlen(line);
|
|
int i, j;
|
|
char c[2] = " ";
|
|
int same = 1;
|
|
|
|
j = 0;
|
|
for (i = 0; i < line_len; i++) {
|
|
c[0] = line[i];
|
|
if (same) {
|
|
if (line[i] == lcs[j])
|
|
j += 1;
|
|
else {
|
|
same = 0;
|
|
htmlf("<span class='%s'>", class);
|
|
}
|
|
} else if (line[i] == lcs[j]) {
|
|
same = 1;
|
|
htmlf("</span>");
|
|
j += 1;
|
|
}
|
|
html_txt(c);
|
|
}
|
|
}
|
|
|
|
static void print_ssdiff_line(char *class,
|
|
int old_line_no,
|
|
char *old_line,
|
|
int new_line_no,
|
|
char *new_line, int individual_chars)
|
|
{
|
|
char *lcs = NULL;
|
|
if (old_line)
|
|
old_line = replace_tabs(old_line + 1);
|
|
if (new_line)
|
|
new_line = replace_tabs(new_line + 1);
|
|
if (individual_chars && old_line && new_line)
|
|
lcs = longest_common_subsequence(old_line, new_line);
|
|
html("<tr>");
|
|
if (old_line_no > 0)
|
|
htmlf("<td class='lineno'>%d</td><td class='%s'>",
|
|
old_line_no, class);
|
|
else if (old_line)
|
|
htmlf("<td class='lineno'></td><td class='%s'>", class);
|
|
else
|
|
htmlf("<td class='lineno'></td><td class='%s_dark'>", class);
|
|
if (old_line) {
|
|
if (lcs)
|
|
print_part_with_lcs("del", old_line, lcs);
|
|
else
|
|
html_txt(old_line);
|
|
}
|
|
|
|
html("</td>");
|
|
if (new_line_no > 0)
|
|
htmlf("<td class='lineno'>%d</td><td class='%s'>",
|
|
new_line_no, class);
|
|
else if (new_line)
|
|
htmlf("<td class='lineno'></td><td class='%s'>", class);
|
|
else
|
|
htmlf("<td class='lineno'></td><td class='%s_dark'>", class);
|
|
if (new_line) {
|
|
if (lcs)
|
|
print_part_with_lcs("add", new_line, lcs);
|
|
else
|
|
html_txt(new_line);
|
|
}
|
|
|
|
html("</td></tr>");
|
|
if (lcs)
|
|
free(lcs);
|
|
if (new_line)
|
|
free(new_line);
|
|
if (old_line)
|
|
free(old_line);
|
|
}
|
|
|
|
static void print_deferred_old_lines()
|
|
{
|
|
struct deferred_lines *iter_old, *tmp;
|
|
iter_old = deferred_old;
|
|
while (iter_old) {
|
|
print_ssdiff_line("del", iter_old->line_no,
|
|
iter_old->line, -1, NULL, 0);
|
|
tmp = iter_old->next;
|
|
free(iter_old);
|
|
iter_old = tmp;
|
|
}
|
|
}
|
|
|
|
static void print_deferred_new_lines()
|
|
{
|
|
struct deferred_lines *iter_new, *tmp;
|
|
iter_new = deferred_new;
|
|
while (iter_new) {
|
|
print_ssdiff_line("add", -1, NULL,
|
|
iter_new->line_no, iter_new->line, 0);
|
|
tmp = iter_new->next;
|
|
free(iter_new);
|
|
iter_new = tmp;
|
|
}
|
|
}
|
|
|
|
static void print_deferred_changed_lines()
|
|
{
|
|
struct deferred_lines *iter_old, *iter_new, *tmp;
|
|
int n_old_lines = calc_deferred_lines(deferred_old);
|
|
int n_new_lines = calc_deferred_lines(deferred_new);
|
|
int individual_chars = (n_old_lines == n_new_lines ? 1 : 0);
|
|
|
|
iter_old = deferred_old;
|
|
iter_new = deferred_new;
|
|
while (iter_old || iter_new) {
|
|
if (iter_old && iter_new)
|
|
print_ssdiff_line("changed", iter_old->line_no,
|
|
iter_old->line,
|
|
iter_new->line_no, iter_new->line,
|
|
individual_chars);
|
|
else if (iter_old)
|
|
print_ssdiff_line("changed", iter_old->line_no,
|
|
iter_old->line, -1, NULL, 0);
|
|
else if (iter_new)
|
|
print_ssdiff_line("changed", -1, NULL,
|
|
iter_new->line_no, iter_new->line, 0);
|
|
if (iter_old) {
|
|
tmp = iter_old->next;
|
|
free(iter_old);
|
|
iter_old = tmp;
|
|
}
|
|
|
|
if (iter_new) {
|
|
tmp = iter_new->next;
|
|
free(iter_new);
|
|
iter_new = tmp;
|
|
}
|
|
}
|
|
}
|
|
|
|
void cgit_ssdiff_print_deferred_lines()
|
|
{
|
|
if (!deferred_old && !deferred_new)
|
|
return;
|
|
if (deferred_old && !deferred_new)
|
|
print_deferred_old_lines();
|
|
else if (!deferred_old && deferred_new)
|
|
print_deferred_new_lines();
|
|
else
|
|
print_deferred_changed_lines();
|
|
deferred_old = deferred_old_last = NULL;
|
|
deferred_new = deferred_new_last = NULL;
|
|
}
|
|
|
|
/*
|
|
* print a single line returned from xdiff
|
|
*/
|
|
void cgit_ssdiff_line_cb(char *line, int len)
|
|
{
|
|
char c = line[len - 1];
|
|
line[len - 1] = '\0';
|
|
if (line[0] == '@') {
|
|
current_old_line = line_from_hunk(line, '-');
|
|
current_new_line = line_from_hunk(line, '+');
|
|
}
|
|
|
|
if (line[0] == ' ') {
|
|
if (deferred_old || deferred_new)
|
|
cgit_ssdiff_print_deferred_lines();
|
|
print_ssdiff_line("ctx", current_old_line, line,
|
|
current_new_line, line, 0);
|
|
current_old_line += 1;
|
|
current_new_line += 1;
|
|
} else if (line[0] == '+') {
|
|
deferred_new_add(line, current_new_line);
|
|
current_new_line += 1;
|
|
} else if (line[0] == '-') {
|
|
deferred_old_add(line, current_old_line);
|
|
current_old_line += 1;
|
|
} else if (line[0] == '@') {
|
|
html("<tr><td colspan='4' class='hunk'>");
|
|
html_txt(line);
|
|
html("</td></tr>");
|
|
} else {
|
|
html("<tr><td colspan='4' class='ctx'>");
|
|
html_txt(line);
|
|
html("</td></tr>");
|
|
}
|
|
line[len - 1] = c;
|
|
}
|
|
|
|
void cgit_ssdiff_header_begin()
|
|
{
|
|
current_old_line = -1;
|
|
current_new_line = -1;
|
|
html("<tr><td class='space' colspan='4'><div></div></td></tr>");
|
|
html("<tr><td class='head' colspan='4'>");
|
|
}
|
|
|
|
void cgit_ssdiff_header_end()
|
|
{
|
|
html("</td><tr>");
|
|
}
|
|
|
|
void cgit_ssdiff_footer()
|
|
{
|
|
if (deferred_old || deferred_new)
|
|
cgit_ssdiff_print_deferred_lines();
|
|
html("<tr><td class='foot' colspan='4'></td></tr>");
|
|
}
|