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#include "cgit.h"
#include "ui-ssdiff.h"
#include "html.h"
#include "ui-shared.h"
#include "ui-diff.h"
extern int use_ssdiff;
static int current_old_line, current_new_line;
static int **L = NULL;
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 void create_or_reset_lcs_table(void)
{
int i;
if (L != NULL) {
memset(*L, 0, sizeof(int) * MAX_SSDIFF_SIZE);
return;
}
// xcalloc will die if we ran out of memory;
// not very helpful for debugging
L = (int**)xcalloc(MAX_SSDIFF_M, sizeof(int *));
*L = (int*)xcalloc(MAX_SSDIFF_SIZE, sizeof(int));
for (i = 1; i < MAX_SSDIFF_M; i++) {
L[i] = *L + i * MAX_SSDIFF_N;
}
}
static char *longest_common_subsequence(char *A, char *B)
{
int i, j, ri;
int m = strlen(A);
int n = strlen(B);
int tmp1, tmp2;
int lcs_length;
char *result;
// We bail if the lines are too long
if (m >= MAX_SSDIFF_M || n >= MAX_SSDIFF_N)
return NULL;
create_or_reset_lcs_table();
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, res;
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);
strlcpy(buf2, buf1, len + 1);
res = atoi(buf2);
free(buf2);
return res;
}
static char *replace_tabs(char *line)
{
char *prev_buf = line;
char *cur_buf;
size_t linelen = strlen(line);
int n_tabs = 0;
int i;
char *result;
int result_len;
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_len = linelen + n_tabs * 8;
result = xmalloc(result_len + 1);
result[0] = '\0';
for (;;) {
cur_buf = strchr(prev_buf, '\t');
if (!cur_buf) {
strncat(result, prev_buf, result_len);
break;
} else {
strncat(result, prev_buf, cur_buf - prev_buf);
linelen = strlen(result);
memset(&result[linelen], ' ', 8 - (linelen % 8));
result[linelen + 8 - (linelen % 8)] = '\0';
}
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>\n");
if (old_line_no > 0) {
struct diff_filespec *old_file = cgit_get_current_old_file();
char *lineno_str = fmt("n%d", old_line_no);
char *id_str = fmt("id=%s#%s", is_null_oid(&old_file->oid)?"HEAD":oid_to_hex(old_rev_oid), lineno_str);
char *fileurl = cgit_fileurl(ctx.repo->url, "tree", old_file->path, id_str);
html("<td class='lineno'><a href='");
html(fileurl);
htmlf("' id='%s'>%s</a>", lineno_str, lineno_str + 1);
html("</td>");
htmlf("<td class='%s'>", class);
free(fileurl);
} 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>\n");
if (new_line_no > 0) {
struct diff_filespec *new_file = cgit_get_current_new_file();
char *lineno_str = fmt("n%d", new_line_no);
char *id_str = fmt("id=%s#%s", is_null_oid(&new_file->oid)?"HEAD":oid_to_hex(new_rev_oid), lineno_str);
char *fileurl = cgit_fileurl(ctx.repo->url, "tree", new_file->path, id_str);
html("<td class='lineno'><a href='");
html(fileurl);
htmlf("' id='%s'>%s</a>", lineno_str, lineno_str + 1);
html("</td>");
htmlf("<td class='%s'>", class);
free(fileurl);
} 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(void)
{
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(void)
{
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(void)
{
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(void)
{
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 (void)
{
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 (void)
{
html("</td><tr>");
}
void (void)
{
if (deferred_old || deferred_new)
cgit_ssdiff_print_deferred_lines();
html("<tr><td class='foot' colspan='4'></td></tr>");
}
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