#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; size_t 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) { linelen = strlen(result); strlcpy(&result[linelen], prev_buf, result_len - linelen + 1); break; } else { linelen = strlen(result); strlcpy(&result[linelen], prev_buf, cur_buf - prev_buf + 1); 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; html("</span>"); j += 1; } html_txt(c); } if (!same) html("</span>");} 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("'>%s</a>", 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("'>%s</a>", 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 cgit_ssdiff_header_begin(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 cgit_ssdiff_header_end(void){ html("</td></tr>");} void cgit_ssdiff_footer(void){ if (deferred_old || deferred_new) cgit_ssdiff_print_deferred_lines(); html("<tr><td class='foot' colspan='4'></td></tr>");}
#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;
size_t 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) {
linelen = strlen(result);
strlcpy(&result[linelen], prev_buf, result_len - linelen + 1);
break;
} else {
linelen = strlen(result);
strlcpy(&result[linelen], prev_buf, cur_buf - prev_buf + 1);
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;
html("</span>");
j += 1;
}
html_txt(c);
}
if (!same)
html("</span>");
}
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("'>%s</a>", 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("'>%s</a>", 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 cgit_ssdiff_header_begin(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 cgit_ssdiff_header_end(void)
{
html("</td></tr>");
}
void cgit_ssdiff_footer(void)
{
if (deferred_old || deferred_new)
cgit_ssdiff_print_deferred_lines();
html("<tr><td class='foot' colspan='4'></td></tr>");
}