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list-objects-filter: encapsulate filter components

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Encapsulate filter_fn, filter_free_fn, and filter_data into their own
opaque struct.

Due to opaqueness, filter_fn and filter_free_fn can no longer be
accessed directly by users. Currently, all usages of filter_fn are
guarded by a necessary check:

	(obj->flags & NOT_USER_GIVEN) && filter_fn

Take the opportunity to include this check into the new function
list_objects_filter__filter_object(), so that we no longer need to write
this check at every caller of the filter function.

Also, the init functions in list-objects-filter.c no longer need to
confusingly return the filter constituents in various places (filter_fn
and filter_free_fn as out parameters, and filter_data as the function's
return value); they can just initialize the "struct filter" passed in.

Helped-by: Jeff Hostetler <git@jeffhostetler.com>
Helped-by: Jonathan Tan <jonathantanmy@google.com>
Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Matthew DeVore <matvore@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Matthew DeVore 2019-06-27 15:54:05 -07:00 committed by Junio C Hamano
parent 8dca754b1e
commit 9430147ca0
3 changed files with 113 additions and 89 deletions
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112
list-objects-filter.c
View File

@ -26,6 +26,20 @@
*/
#define FILTER_SHOWN_BUT_REVISIT (1<<21)
struct filter {
enum list_objects_filter_result (*filter_object_fn)(
struct repository *r,
enum list_objects_filter_situation filter_situation,
struct object *obj,
const char *pathname,
const char *filename,
void *filter_data);
void (*free_fn)(void *filter_data);
void *filter_data;
};
/*
* A filter for list-objects to omit ALL blobs from the traversal.
* And to OPTIONALLY collect a list of the omitted OIDs.
@ -67,18 +81,17 @@ static enum list_objects_filter_result filter_blobs_none(
}
}
static void *filter_blobs_none__init(
static void filter_blobs_none__init(
struct oidset *omitted,
struct list_objects_filter_options *filter_options,
filter_object_fn *filter_fn,
filter_free_fn *filter_free_fn)
struct filter *filter)
{
struct filter_blobs_none_data *d = xcalloc(1, sizeof(*d));
d->omits = omitted;
*filter_fn = filter_blobs_none;
*filter_free_fn = free;
return d;
filter->filter_data = d;
filter->filter_object_fn = filter_blobs_none;
filter->free_fn = free;
}
/*
@ -201,11 +214,10 @@ static void filter_trees_free(void *filter_data) {
free(d);
}
static void *filter_trees_depth__init(
static void filter_trees_depth__init(
struct oidset *omitted,
struct list_objects_filter_options *filter_options,
filter_object_fn *filter_fn,
filter_free_fn *filter_free_fn)
struct filter *filter)
{
struct filter_trees_depth_data *d = xcalloc(1, sizeof(*d));
d->omits = omitted;
@ -213,9 +225,9 @@ static void *filter_trees_depth__init(
d->exclude_depth = filter_options->tree_exclude_depth;
d->current_depth = 0;
*filter_fn = filter_trees_depth;
*filter_free_fn = filter_trees_free;
return d;
filter->filter_data = d;
filter->filter_object_fn = filter_trees_depth;
filter->free_fn = filter_trees_free;
}
/*
@ -281,19 +293,18 @@ include_it:
return LOFR_MARK_SEEN | LOFR_DO_SHOW;
}
static void *filter_blobs_limit__init(
static void filter_blobs_limit__init(
struct oidset *omitted,
struct list_objects_filter_options *filter_options,
filter_object_fn *filter_fn,
filter_free_fn *filter_free_fn)
struct filter *filter)
{
struct filter_blobs_limit_data *d = xcalloc(1, sizeof(*d));
d->omits = omitted;
d->max_bytes = filter_options->blob_limit_value;
*filter_fn = filter_blobs_limit;
*filter_free_fn = free;
return d;
filter->filter_data = d;
filter->filter_object_fn = filter_blobs_limit;
filter->free_fn = free;
}
/*
@ -456,11 +467,10 @@ static void filter_sparse_free(void *filter_data)
free(d);
}
static void *filter_sparse_oid__init(
static void filter_sparse_oid__init(
struct oidset *omitted,
struct list_objects_filter_options *filter_options,
filter_object_fn *filter_fn,
filter_free_fn *filter_free_fn)
struct filter *filter)
{
struct filter_sparse_data *d = xcalloc(1, sizeof(*d));
d->omits = omitted;
@ -473,16 +483,15 @@ static void *filter_sparse_oid__init(
d->array_frame[d->nr].child_prov_omit = 0;
d->nr++;
*filter_fn = filter_sparse;
*filter_free_fn = filter_sparse_free;
return d;
filter->filter_data = d;
filter->filter_object_fn = filter_sparse;
filter->free_fn = filter_sparse_free;
}
typedef void *(*filter_init_fn)(
typedef void (*filter_init_fn)(
struct oidset *omitted,
struct list_objects_filter_options *filter_options,
filter_object_fn *filter_fn,
filter_free_fn *filter_free_fn);
struct filter *filter);
/*
* Must match "enum list_objects_filter_choice".
@ -495,12 +504,11 @@ static filter_init_fn s_filters[] = {
filter_sparse_oid__init,
};
void *list_objects_filter__init(
struct filter *list_objects_filter__init(
struct oidset *omitted,
struct list_objects_filter_options *filter_options,
filter_object_fn *filter_fn,
filter_free_fn *filter_free_fn)
struct list_objects_filter_options *filter_options)
{
struct filter *filter;
filter_init_fn init_fn;
assert((sizeof(s_filters) / sizeof(s_filters[0])) == LOFC__COUNT);
@ -510,10 +518,40 @@ void *list_objects_filter__init(
filter_options->choice);
init_fn = s_filters[filter_options->choice];
if (init_fn)
return init_fn(omitted, filter_options,
filter_fn, filter_free_fn);
*filter_fn = NULL;
*filter_free_fn = NULL;
return NULL;
if (!init_fn)
return NULL;
filter = xcalloc(1, sizeof(*filter));
init_fn(omitted, filter_options, filter);
return filter;
}
enum list_objects_filter_result list_objects_filter__filter_object(
struct repository *r,
enum list_objects_filter_situation filter_situation,
struct object *obj,
const char *pathname,
const char *filename,
struct filter *filter)
{
if (filter && (obj->flags & NOT_USER_GIVEN))
return filter->filter_object_fn(r, filter_situation, obj,
pathname, filename,
filter->filter_data);
/*
* No filter is active or user gave object explicitly. In this case,
* always show the object (except when LOFS_END_TREE, since this tree
* had already been shown when LOFS_BEGIN_TREE).
*/
if (filter_situation == LOFS_END_TREE)
return 0;
return LOFR_MARK_SEEN | LOFR_DO_SHOW;
}
void list_objects_filter__free(struct filter *filter)
{
if (!filter)
return;
filter->free_fn(filter->filter_data);
free(filter);
}

35
list-objects-filter.h
View File

@ -60,30 +60,27 @@ enum list_objects_filter_situation {
LOFS_BLOB
};
typedef enum list_objects_filter_result (*filter_object_fn)(
struct filter;
/* Constructor for the set of defined list-objects filters. */
struct filter *list_objects_filter__init(
struct oidset *omitted,
struct list_objects_filter_options *filter_options);
/*
* Lets `filter` decide how to handle the `obj`. If `filter` is NULL, this
* function behaves as expected if no filter is configured: all objects are
* included.
*/
enum list_objects_filter_result list_objects_filter__filter_object(
struct repository *r,
enum list_objects_filter_situation filter_situation,
struct object *obj,
const char *pathname,
const char *filename,
void *filter_data);
struct filter *filter);
typedef void (*filter_free_fn)(void *filter_data);
/*
* Constructor for the set of defined list-objects filters.
* Returns a generic "void *filter_data".
*
* The returned "filter_fn" will be used by traverse_commit_list()
* to filter the results.
*
* The returned "filter_free_fn" is a destructor for the
* filter_data.
*/
void *list_objects_filter__init(
struct oidset *omitted,
struct list_objects_filter_options *filter_options,
filter_object_fn *filter_fn,
filter_free_fn *filter_free_fn);
/* Destroys `filter`. Does nothing if `filter` is null. */
void list_objects_filter__free(struct filter *filter);
#endif /* LIST_OBJECTS_FILTER_H */

55
list-objects.c
View File

@ -18,8 +18,7 @@ struct traversal_context {
show_object_fn show_object;
show_commit_fn show_commit;
void *show_data;
filter_object_fn filter_fn;
void *filter_data;
struct filter *filter;
};
static void process_blob(struct traversal_context *ctx,
@ -29,7 +28,7 @@ static void process_blob(struct traversal_context *ctx,
{
struct object *obj = &blob->object;
size_t pathlen;
enum list_objects_filter_result r = LOFR_MARK_SEEN | LOFR_DO_SHOW;
enum list_objects_filter_result r;
if (!ctx->revs->blob_objects)
return;
@ -54,11 +53,10 @@ static void process_blob(struct traversal_context *ctx,
pathlen = path->len;
strbuf_addstr(path, name);
if ((obj->flags & NOT_USER_GIVEN) && ctx->filter_fn)
r = ctx->filter_fn(ctx->revs->repo,
LOFS_BLOB, obj,
path->buf, &path->buf[pathlen],
ctx->filter_data);
r = list_objects_filter__filter_object(ctx->revs->repo,
LOFS_BLOB, obj,
path->buf, &path->buf[pathlen],
ctx->filter);
if (r & LOFR_MARK_SEEN)
obj->flags |= SEEN;
if (r & LOFR_DO_SHOW)
@ -157,7 +155,7 @@ static void process_tree(struct traversal_context *ctx,
struct object *obj = &tree->object;
struct rev_info *revs = ctx->revs;
int baselen = base->len;
enum list_objects_filter_result r = LOFR_MARK_SEEN | LOFR_DO_SHOW;
enum list_objects_filter_result r;
int failed_parse;
if (!revs->tree_objects)
@ -186,11 +184,10 @@ static void process_tree(struct traversal_context *ctx,
}
strbuf_addstr(base, name);
if ((obj->flags & NOT_USER_GIVEN) && ctx->filter_fn)
r = ctx->filter_fn(ctx->revs->repo,
LOFS_BEGIN_TREE, obj,
base->buf, &base->buf[baselen],
ctx->filter_data);
r = list_objects_filter__filter_object(ctx->revs->repo,
LOFS_BEGIN_TREE, obj,
base->buf, &base->buf[baselen],
ctx->filter);
if (r & LOFR_MARK_SEEN)
obj->flags |= SEEN;
if (r & LOFR_DO_SHOW)
@ -203,16 +200,14 @@ static void process_tree(struct traversal_context *ctx,
else if (!failed_parse)
process_tree_contents(ctx, tree, base);
if ((obj->flags & NOT_USER_GIVEN) && ctx->filter_fn) {
r = ctx->filter_fn(ctx->revs->repo,
LOFS_END_TREE, obj,
base->buf, &base->buf[baselen],
ctx->filter_data);
if (r & LOFR_MARK_SEEN)
obj->flags |= SEEN;
if (r & LOFR_DO_SHOW)
ctx->show_object(obj, base->buf, ctx->show_data);
}
r = list_objects_filter__filter_object(ctx->revs->repo,
LOFS_END_TREE, obj,
base->buf, &base->buf[baselen],
ctx->filter);
if (r & LOFR_MARK_SEEN)
obj->flags |= SEEN;
if (r & LOFR_DO_SHOW)
ctx->show_object(obj, base->buf, ctx->show_data);
strbuf_setlen(base, baselen);
free_tree_buffer(tree);
@ -402,8 +397,7 @@ void traverse_commit_list(struct rev_info *revs,
ctx.show_commit = show_commit;
ctx.show_object = show_object;
ctx.show_data = show_data;
ctx.filter_fn = NULL;
ctx.filter_data = NULL;
ctx.filter = NULL;
do_traverse(&ctx);
}
@ -416,17 +410,12 @@ void traverse_commit_list_filtered(
struct oidset *omitted)
{
struct traversal_context ctx;
filter_free_fn filter_free_fn = NULL;
ctx.revs = revs;
ctx.show_object = show_object;
ctx.show_commit = show_commit;
ctx.show_data = show_data;
ctx.filter_fn = NULL;
ctx.filter_data = list_objects_filter__init(omitted, filter_options,
&ctx.filter_fn, &filter_free_fn);
ctx.filter = list_objects_filter__init(omitted, filter_options);
do_traverse(&ctx);
if (ctx.filter_data && filter_free_fn)
filter_free_fn(ctx.filter_data);
list_objects_filter__free(ctx.filter);
}