| #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); |
| strncpy(buf2, buf1, len); |
| buf2[len] = '\0'; |
| 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 { |
| strncat(result, prev_buf, cur_buf - prev_buf); |
| strncat(result, spaces, 8 - (strlen(result) % 8)); |
| } |
| 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 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>"); |
| } |