Diff options
Diffstat (limited to 'ui-ssdiff.c')
| -rw-r--r-- | ui-ssdiff.c | 145 |
1 file changed, 120 insertions, 25 deletions
diff --git a/ui-ssdiff.c b/ui-ssdiff.c index 5673642..408e620 100644 --- a/ui-ssdiff.c +++ b/ui-ssdiff.c @@ -15,6 +15,52 @@ struct deferred_lines { 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; @@ -73,6 +119,17 @@ static char *replace_tabs(char *line) 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)); @@ -101,9 +158,45 @@ static void deferred_new_add(char *line, int line_no) } } -static void print_ssdiff_line(char *class, int old_line_no, char *old_line, - int new_line_no, char *new_line) +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'>", @@ -112,15 +205,14 @@ static void print_ssdiff_line(char *class, int old_line_no, char *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) { - old_line = replace_tabs(old_line + 1); - html_txt(old_line); - free(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); @@ -128,24 +220,29 @@ static void print_ssdiff_line(char *class, int old_line_no, char *old_line, htmlf("<td class='lineno'></td><td class='%s'>", class); else htmlf("<td class='lineno'></td><td class='%s_dark'>", class); - if (new_line) { - new_line = replace_tabs(new_line + 1); - html_txt(new_line); - free(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); + iter_old->line, -1, NULL, 0); tmp = iter_old->next; free(iter_old); iter_old = tmp; @@ -155,11 +252,10 @@ static void print_deferred_old_lines() 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); + print_ssdiff_line("add", -1, NULL, + iter_new->line_no, iter_new->line, 0); tmp = iter_new->next; free(iter_new); iter_new = tmp; @@ -169,6 +265,9 @@ static void print_deferred_new_lines() 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; @@ -176,14 +275,14 @@ static void print_deferred_changed_lines() if (iter_old && iter_new) print_ssdiff_line("changed", iter_old->line_no, iter_old->line, - iter_new->line_no, iter_new->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); + iter_old->line, -1, NULL, 0); else if (iter_new) print_ssdiff_line("changed", -1, NULL, - iter_new->line_no, iter_new->line); - + iter_new->line_no, iter_new->line, 0); if (iter_old) { tmp = iter_old->next; free(iter_old); @@ -202,14 +301,12 @@ 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; } @@ -220,9 +317,7 @@ void cgit_ssdiff_print_deferred_lines() 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, '+'); @@ -232,7 +327,7 @@ void cgit_ssdiff_line_cb(char *line, int len) if (deferred_old || deferred_new) cgit_ssdiff_print_deferred_lines(); print_ssdiff_line("ctx", current_old_line, line, - current_new_line, line); + current_new_line, line, 0); current_old_line += 1; current_new_line += 1; } else if (line[0] == '+') { |