'struct diff_line_range' is the main data structure to keep
track of the line ranges we are currently interested in. The
user starts digging from a line range, and after examining the
diff that affects that range by a commit, we can find a new
range that corresponds to this range. So, we will associate this
new range with the commit's parent commit.
There is one 'diff_line_range' for each file, and there are
multiple 'struct line_range' in each 'diff_line_range'. In this way,
we support multiple ranges.
Within 'struct line_range', there are multiple 'struct print_range'
which represent a diff hunk.
Signed-off-by: Bo Yang <struggleyb.nku@xxxxxxxxx>
---
Makefile | 2 +
line.c | 455 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
line.h | 128 +++++++++++++++++
revision.h | 8 +-
4 files changed, 591 insertions(+), 2 deletions(-)
create mode 100644 line.c
create mode 100644 line.h
diff --git a/Makefile b/Makefile
index 4179186..c194e79 100644
--- a/Makefile
+++ b/Makefile
@@ -496,6 +496,7 @@ LIB_H += grep.h
LIB_H += hash.h
LIB_H += help.h
LIB_H += levenshtein.h
+LIB_H += line.h
LIB_H += list-objects.h
LIB_H += ll-merge.h
LIB_H += log-tree.h
@@ -582,6 +583,7 @@ LIB_OBJS += help.o
LIB_OBJS += hex.o
LIB_OBJS += ident.o
LIB_OBJS += levenshtein.o
+LIB_OBJS += line.o
LIB_OBJS += list-objects.o
LIB_OBJS += ll-merge.o
LIB_OBJS += lockfile.o
diff --git a/line.c b/line.c
new file mode 100644
index 0000000..e277fa6
--- /dev/null
+++ b/line.c
@@ -0,0 +1,455 @@
+#include "cache.h"
+#include "tag.h"
+#include "blob.h"
+#include "tree.h"
+#include "diff.h"
+#include "commit.h"
+#include "decorate.h"
+#include "revision.h"
+#include "xdiff-interface.h"
+#include "strbuf.h"
+#include "log-tree.h"
+#include "line.h"
+
+static void cleanup(struct diff_line_range *r)
+{
+ while (r) {
+ struct diff_line_range *next = r->next;
+ DIFF_LINE_RANGE_CLEAR(r);
+ free(r);
+ r = next;
+ }
+}
+
+static struct object *verify_commit(struct rev_info *revs)
+{
+ struct object *commit = NULL;
+ int found = -1;
+ int i;
+
+ for (i = 0; i < revs->pending.nr; i++) {
+ struct object *obj = revs->pending.objects[i].item;
+ if (obj->flags & UNINTERESTING)
+ continue;
+ while (obj->type == OBJ_TAG)
+ obj = deref_tag(obj, NULL, 0);
+ if (obj->type != OBJ_COMMIT)
+ die("Non commit %s?", revs->pending.objects[i].name);
+ if (commit)
+ die("More than one commit to dig from: %s and %s?",
+ revs->pending.objects[i].name,
+ revs->pending.objects[found].name);
+ commit = obj;
+ found = i;
+ }
+
+ if (commit == NULL)
+ die("No commit specified?");
+
+ return commit;
+}
+
+static void fill_blob_sha1(struct commit *commit, struct diff_line_range *r)
+{
+ unsigned mode;
+ unsigned char sha1[20];
+
+ while (r) {
+ if (get_tree_entry(commit->object.sha1, r->spec->path,
+ sha1, &mode))
+ goto error;
+ fill_filespec(r->spec, sha1, mode);
+ r = r->next;
+ }
+
+ return;
+error:
+ die("There is no path %s in the commit", r->spec->path);
+}
+
+static void fill_line_ends(struct diff_filespec *spec, long *lines,
+ unsigned long **line_ends)
+{
+ int num = 0, size = 50;
+ long cur = 0;
+ unsigned long *ends = NULL;
+ char *data = NULL;
+
+ if (diff_populate_filespec(spec, 0))
+ die("Cannot read blob %s", sha1_to_hex(spec->sha1));
+
+ ends = xmalloc(size * sizeof(*ends));
+ ends[cur++] = 0;
+ data = spec->data;
+ while (num < spec->size) {
+ if (data[num] == '\n' || num == spec->size - 1) {
+ ALLOC_GROW(ends, (cur + 1), size);
+ ends[cur++] = num;
+ }
+ num++;
+ }
+
+ /* shrink the array to fit the elements */
+ ends = xrealloc(ends, cur * sizeof(*ends));
+ *lines = cur;
+ *line_ends = ends;
+}
+
+static const char *nth_line(struct diff_filespec *spec, long line,
+ long lines, unsigned long *line_ends)
+{
+ assert(line < lines);
+ assert(spec && spec->data);
+
+ if (line == 0)
+ return (char *)spec->data;
+ else
+ return (char *)spec->data + line_ends[line] + 1;
+}
+
+/*
+ * copied from blame.c, indeed, we can even to use this to test
+ * whether line log works. :)
+ */
+static const char *parse_loc(const char *spec, struct diff_filespec *file,
+ long lines, unsigned long *line_ends,
+ long begin, long *ret)
+{
+ char *term;
+ const char *line;
+ long num;
+ int reg_error;
+ regex_t regexp;
+ regmatch_t match[1];
+
+ /* Allow "-L <something>,+20" to mean starting at <something>
+ * for 20 lines, or "-L <something>,-5" for 5 lines ending at
+ * <something>.
+ */
+ if (1 < begin && (spec[0] == '+' || spec[0] == '-')) {
+ num = strtol(spec + 1, &term, 10);
+ if (term != spec + 1) {
+ if (spec[0] == '-')
+ num = 0 - num;
+ if (0 < num)
+ *ret = begin + num - 2;
+ else if (!num)
+ *ret = begin;
+ else
+ *ret = begin + num;
+ return term;
+ }
+ return spec;
+ }
+ num = strtol(spec, &term, 10);
+ if (term != spec) {
+ *ret = num;
+ return term;
+ }
+ if (spec[0] != '/')
+ return spec;
+
+ /* it could be a regexp of form /.../ */
+ for (term = (char *) spec + 1; *term && *term != '/'; term++) {
+ if (*term == '\\')
+ term++;
+ }
+ if (*term != '/')
+ return spec;
+
+ /* try [spec+1 .. term-1] as regexp */
+ *term = 0;
+ begin--; /* input is in human terms */
+ line = nth_line(file, begin, lines, line_ends);
+
+ if (!(reg_error = regcomp(®exp, spec + 1, REG_NEWLINE)) &&
+ !(reg_error = regexec(®exp, line, 1, match, 0))) {
+ const char *cp = line + match[0].rm_so;
+ const char *nline;
+
+ while (begin++ < lines) {
+ nline = nth_line(file, begin, lines, line_ends);
+ if (line <= cp && cp < nline)
+ break;
+ line = nline;
+ }
+ *ret = begin;
+ regfree(®exp);
+ *term++ = '/';
+ return term;
+ } else {
+ char errbuf[1024];
+ regerror(reg_error, ®exp, errbuf, 1024);
+ die("-L parameter '%s': %s", spec + 1, errbuf);
+ }
+}
+
+static void parse_range(long lines, unsigned long *line_ends,
+ struct line_range *r, struct diff_filespec *spec)
+{
+ const char *term;
+
+ term = parse_loc(r->arg, spec, lines, line_ends, 1, &r->start);
+ if (*term == ',') {
+ term = parse_loc(term + 1, spec, lines, line_ends,
+ r->start + 1, &r->end);
+ if (*term)
+ die("-L parameter's argument should be <start>,<end>");
+ }
+
+ if (*term)
+ die("-L parameter's argument should be <start>,<end>");
+
+ if (r->start > r->end) {
+ long tmp = r->start;
+ r->start = r->end;
+ r->end = tmp;
+ }
+
+ if (r->start < 1)
+ r->start = 1;
+ if (r->end >= lines)
+ r->end = lines - 1;
+}
+
+static void parse_lines(struct commit *commit, struct diff_line_range *r)
+{
+ int i;
+ struct line_range *old_range = NULL;
+ long lines = 0;
+ unsigned long *ends = NULL;
+
+ while (r) {
+ struct diff_filespec *spec = r->spec;
+ int num = r->nr;
+ assert(spec);
+ fill_blob_sha1(commit, r);
+ old_range = r->ranges;
+ r->ranges = NULL;
+ r->nr = r->alloc = 0;
+ fill_line_ends(spec, &lines, &ends);
+ for (i = 0; i < num; i++) {
+ parse_range(lines, ends, old_range + i, spec);
+ diff_line_range_insert(r, old_range[i].arg,
+ old_range[i].start, old_range[i].end);
+ }
+
+ free(ends);
+ ends = NULL;
+
+ r = r->next;
+ free(old_range);
+ }
+}
+
+/*
+ * Insert a new line range into a diff_line_range struct, and keep the
+ * r->ranges sorted by their starting line number.
+ */
+struct line_range *diff_line_range_insert(struct diff_line_range *r,
+ const char *arg, int start, int end)
+{
+ int i = 0;
+ struct line_range *rs = r->ranges;
+ int left_merge = 0, right_merge = 0;
+
+ assert(r != NULL);
+ assert(start <= end);
+
+ if (r->nr == 0 || rs[r->nr - 1].end < start - 1) {
+ int num = 0;
+ DIFF_LINE_RANGE_GROW(r);
+ rs = r->ranges;
+ num = r->nr - 1;
+ rs[num].arg = arg;
+ rs[num].start = start;
+ rs[num].end = end;
+ return rs + num;
+ }
+
+ for (; i < r->nr; i++) {
+ if (rs[i].end < start - 1)
+ continue;
+ if (rs[i].end == start - 1) {
+ rs[i].end = end;
+ right_merge = 1;
+ goto out;
+ }
+
+ assert(rs[i].end > start - 1);
+ if (rs[i].start <= start) {
+ if (rs[i].end < end) {
+ rs[i].end = end;
+ right_merge = 1;
+ }
+ goto out;
+ } else if (rs[i].start <= end + 1) {
+ rs[i].start = start;
+ left_merge = 1;
+ if (rs[i].end < end) {
+ rs[i].end = end;
+ right_merge = 1;
+ }
+ goto out;
+ } else {
+ int num = r->nr - i;
+ DIFF_LINE_RANGE_GROW(r);
+ rs = r->ranges;
+ memmove(rs + i + 1, rs + i, num * sizeof(struct line_range));
+ rs[i].arg = arg;
+ rs[i].start = start;
+ rs[i].end = end;
+ goto out;
+ }
+ }
+
+out:
+ assert(r->nr != i);
+ if (left_merge) {
+ int j = i;
+ for (; j > -1; j--) {
+ if (rs[j].end >= rs[i].start - 1)
+ if (rs[j].start < rs[i].start)
+ rs[i].start = rs[j].start;
+ }
+ memmove(rs + j + 1, rs + i, (r->nr - i) * sizeof(struct line_range));
+ r->nr -= i - j - 1;
+ }
+ if (right_merge) {
+ int j = i;
+ for (; j < r->nr; j++) {
+ if (rs[j].start <= rs[i].end + 1)
+ if (rs[j].end > rs[i].end)
+ rs[i].end = rs[j].end;
+ }
+ if (j < r->nr)
+ memmove(rs + i + 1, rs + j, (r->nr - j) * sizeof(struct line_range));
+ r->nr -= j - i - 1;
+ }
+ assert(r->nr);
+
+ return rs + i;
+}
+
+void diff_line_range_clear(struct diff_line_range *r)
+{
+ int i = 0, zero = 0;
+
+ for (; i < r->nr; i++) {
+ struct line_range *rg = r->ranges + i;
+ RANGE_CLEAR(rg);
+ }
+
+ if (r->prev) {
+ zero = 0;
+ if (r->prev->count == 1)
+ zero = 1;
+ free_filespec(r->prev);
+ if (zero)
+ r->prev = NULL;
+ }
+ if (r->spec) {
+ zero = 0;
+ if (r->spec->count == 1)
+ zero = 1;
+ free_filespec(r->spec);
+ if (zero)
+ r->spec = NULL;
+ }
+
+ r->status = '\0';
+ r->alloc = r->nr = 0;
+
+ if (r->ranges)
+ free(r->ranges);
+ r->ranges = NULL;
+ r->next = NULL;
+}
+
+void diff_line_range_append(struct diff_line_range *r, const char *arg)
+{
+ DIFF_LINE_RANGE_GROW(r);
+ r->ranges[r->nr - 1].arg = arg;
+}
+
+struct diff_line_range *diff_line_range_merge(struct diff_line_range *out,
+ struct diff_line_range *other)
+{
+ struct diff_line_range *one = out, *two = other;
+ struct diff_line_range *pone;
+
+ while (one) {
+ struct diff_line_range *ptwo;
+ two = other;
+ ptwo = other;
+ while (two) {
+ if (!strcmp(one->spec->path, two->spec->path)) {
+ int i = 0;
+ for (; i < two->nr; i++) {
+ diff_line_range_insert(one, NULL,
+ two->ranges[i].start,
+ two->ranges[i].end);
+ }
+ if (two == other)
+ other = other->next;
+ else
+ ptwo->next = two->next;
+ DIFF_LINE_RANGE_CLEAR(two);
+ free(two);
+ two = NULL;
+
+ break;
+ }
+
+ ptwo = two;
+ two = two->next;
+ }
+
+ pone = one;
+ one = one->next;
+ }
+ pone->next = other;
+
+ return out;
+}
+
+void add_line_range(struct rev_info *revs, struct commit *commit,
+ struct diff_line_range *r)
+{
+ struct diff_line_range *ret = NULL;
+
+ if (r != NULL) {
+ ret = lookup_decoration(&revs->line_range, &commit->object);
+ if (ret != NULL)
+ diff_line_range_merge(ret, r);
+ else
+ add_decoration(&revs->line_range, &commit->object, r);
+ commit->object.flags |= RANGE_UPDATE;
+ }
+}
+
+struct diff_line_range *lookup_line_range(struct rev_info *revs,
+ struct commit *commit)
+{
+ struct diff_line_range *ret = NULL;
+
+ ret = lookup_decoration(&revs->line_range, &commit->object);
+ return ret;
+}
+
+void setup_line(struct rev_info *rev, struct diff_line_range *r)
+{
+ struct commit *commit = NULL;
+ struct diff_options *opt = &rev->diffopt;
+
+ commit = (struct commit *)verify_commit(rev);
+ parse_lines(commit, r);
+
+ add_line_range(rev, commit, r);
+ /*
+ * Note we support -M/-C to detect file rename
+ */
+ opt->nr_paths = 0;
+ diff_tree_release_paths(opt);
+}
+
diff --git a/line.h b/line.h
new file mode 100644
index 0000000..a04af86
--- /dev/null
+++ b/line.h
@@ -0,0 +1,128 @@
+#ifndef LINE_H
+#define LINE_H
+
+#include "diffcore.h"
+
+struct rev_info;
+struct commit;
+struct diff_line_range;
+struct diff_options;
+
+struct print_range {
+ int start, end; /* Line range of post-image */
+ int pstart, pend; /* Line range of pre-image */
+ int line_added : 1; /* whether this range is added */
+};
+
+struct print_pair {
+ int alloc, nr;
+ struct print_range *ranges;
+};
+
+#define PRINT_RANGE_INIT(r) \
+ do { \
+ (r)->start = (r)->end = 0; \
+ (r)->pstart = (r)->pend = 0; \
+ (r)->line_added = 0; \
+ } while (0)
+
+#define PRINT_PAIR_INIT(p) \
+ do { \
+ (p)->alloc = (p)->nr = 0; \
+ (p)->ranges = NULL; \
+ } while (0)
+
+#define PRINT_PAIR_GROW(p) \
+ do { \
+ (p)->nr++; \
+ ALLOC_GROW((p)->ranges, (p)->nr, (p)->alloc); \
+ } while (0)
+
+#define PRINT_PAIR_CLEAR(p) \
+ do { \
+ (p)->alloc = (p)->nr = 0; \
+ if ((p)->ranges) \
+ free((p)->ranges); \
+ (p)->ranges = NULL; \
+ } while (0)
+
+struct line_range {
+ const char *arg; /* The argument to specify this line range */
+ long start, end; /* The interesting line range of current commit */
+ long pstart, pend; /* The corresponding range of parent commit */
+ struct print_pair pair;
+ /* The changed lines inside this range */
+ unsigned int diff:1;
+};
+
+struct diff_line_range {
+ struct diff_filespec *prev;
+ struct diff_filespec *spec;
+ char status;
+ int alloc;
+ int nr;
+ struct line_range *ranges;
+ unsigned int touch:1,
+ diff:1;
+ struct diff_line_range *next;
+};
+
+#define RANGE_INIT(r) \
+ do { \
+ (r)->arg = NULL; \
+ (r)->start = (r)->end = 0; \
+ (r)->pstart = (r)->pend = 0; \
+ PRINT_PAIR_INIT(&((r)->pair)); \
+ (r)->diff = 0; \
+ } while (0)
+
+#define RANGE_CLEAR(r) \
+ do { \
+ (r)->arg = NULL; \
+ (r)->start = (r)->end = 0; \
+ (r)->pstart = (r)->pend = 0; \
+ PRINT_PAIR_CLEAR(&r->pair); \
+ (r)->diff = 0; \
+ } while (0)
+
+#define DIFF_LINE_RANGE_INIT(r) \
+ do { \
+ (r)->prev = (r)->spec = NULL; \
+ (r)->status = '\0'; \
+ (r)->alloc = (r)->nr = 0; \
+ (r)->ranges = NULL; \
+ (r)->next = NULL; \
+ (r)->touch = 0; \
+ (r)->diff = 0; \
+ } while (0)
+
+#define DIFF_LINE_RANGE_GROW(r) \
+ do { \
+ (r)->nr++; \
+ ALLOC_GROW((r)->ranges, (r)->nr, (r)->alloc); \
+ RANGE_INIT(((r)->ranges + (r)->nr - 1)); \
+ } while (0)
+
+#define DIFF_LINE_RANGE_CLEAR(r) \
+ diff_line_range_clear((r));
+
+extern struct line_range *diff_line_range_insert(struct diff_line_range *r,
+ const char *arg, int start, int end);
+
+extern void diff_line_range_append(struct diff_line_range *r, const char *arg);
+
+extern void diff_line_range_clear(struct diff_line_range *r);
+
+extern struct diff_line_range *diff_line_range_merge(
+ struct diff_line_range *out,
+ struct diff_line_range *other);
+
+extern void setup_line(struct rev_info *rev, struct diff_line_range *r);
+
+extern void add_line_range(struct rev_info *revs, struct commit *commit,
+ struct diff_line_range *r);
+
+extern struct diff_line_range *lookup_line_range(struct rev_info *revs,
+ struct commit *commit);
+
+#endif
diff --git a/revision.h b/revision.h
index 36fdf22..c0d5065 100644
--- a/revision.h
+++ b/revision.h
@@ -14,7 +14,8 @@
#define CHILD_SHOWN (1u<<6)
#define ADDED (1u<<7) /* Parents already parsed and added? */
#define SYMMETRIC_LEFT (1u<<8)
-#define ALL_REV_FLAGS ((1u<<9)-1)
+#define RANGE_UPDATE (1u<<9) /* for line level traverse */
+#define ALL_REV_FLAGS ((1u<<10)-1)
#define DECORATE_SHORT_REFS 1
#define DECORATE_FULL_REFS 2
@@ -68,7 +69,8 @@ struct rev_info {
cherry_pick:1,
bisect:1,
ancestry_path:1,
- first_parent_only:1;
+ first_parent_only:1,
+ line_level_traverse:1;
/* Diff flags */
unsigned int diff:1,
@@ -137,6 +139,8 @@ struct rev_info {
/* commit counts */
int count_left;
int count_right;
+ /* line level range that we are chasing */
+ struct decoration line_range;
};
#define REV_TREE_SAME 0
--
1.7.2.19.g79e5d
--
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