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trailer: process trailers from input message and arguments

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Implement the logic to process trailers from the input message
and from arguments.

At the beginning trailers from the input message are in their
own "in_tok" doubly linked list, and trailers from arguments
are in their own "arg_tok" doubly linked list.

The lists are traversed and when an "arg_tok" should be "applied",
it is removed from its list and inserted into the "in_tok" list.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Christian Couder 2014-10-13 20:16:24 +02:00 committed by Junio C Hamano
parent 9385b5d706
commit 4103818d20
1 changed files with 210 additions and 0 deletions
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210
trailer.c
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@ -67,3 +67,213 @@ static int same_trailer(struct trailer_item *a, struct trailer_item *b)
{
return same_token(a, b) && same_value(a, b);
}
static void free_trailer_item(struct trailer_item *item)
{
free(item->conf.name);
free(item->conf.key);
free(item->conf.command);
free((char *)item->token);
free((char *)item->value);
free(item);
}
static void update_last(struct trailer_item **last)
{
if (*last)
while ((*last)->next != NULL)
*last = (*last)->next;
}
static void update_first(struct trailer_item **first)
{
if (*first)
while ((*first)->previous != NULL)
*first = (*first)->previous;
}
static void add_arg_to_input_list(struct trailer_item *on_tok,
struct trailer_item *arg_tok,
struct trailer_item **first,
struct trailer_item **last)
{
if (after_or_end(arg_tok->conf.where)) {
arg_tok->next = on_tok->next;
on_tok->next = arg_tok;
arg_tok->previous = on_tok;
if (arg_tok->next)
arg_tok->next->previous = arg_tok;
update_last(last);
} else {
arg_tok->previous = on_tok->previous;
on_tok->previous = arg_tok;
arg_tok->next = on_tok;
if (arg_tok->previous)
arg_tok->previous->next = arg_tok;
update_first(first);
}
}
static int check_if_different(struct trailer_item *in_tok,
struct trailer_item *arg_tok,
int check_all)
{
enum action_where where = arg_tok->conf.where;
do {
if (!in_tok)
return 1;
if (same_trailer(in_tok, arg_tok))
return 0;
/*
* if we want to add a trailer after another one,
* we have to check those before this one
*/
in_tok = after_or_end(where) ? in_tok->previous : in_tok->next;
} while (check_all);
return 1;
}
static void remove_from_list(struct trailer_item *item,
struct trailer_item **first,
struct trailer_item **last)
{
struct trailer_item *next = item->next;
struct trailer_item *previous = item->previous;
if (next) {
item->next->previous = previous;
item->next = NULL;
} else if (last)
*last = previous;
if (previous) {
item->previous->next = next;
item->previous = NULL;
} else if (first)
*first = next;
}
static struct trailer_item *remove_first(struct trailer_item **first)
{
struct trailer_item *item = *first;
*first = item->next;
if (item->next) {
item->next->previous = NULL;
item->next = NULL;
}
return item;
}
static void apply_arg_if_exists(struct trailer_item *in_tok,
struct trailer_item *arg_tok,
struct trailer_item *on_tok,
struct trailer_item **in_tok_first,
struct trailer_item **in_tok_last)
{
switch (arg_tok->conf.if_exists) {
case EXISTS_DO_NOTHING:
free_trailer_item(arg_tok);
break;
case EXISTS_REPLACE:
add_arg_to_input_list(on_tok, arg_tok,
in_tok_first, in_tok_last);
remove_from_list(in_tok, in_tok_first, in_tok_last);
free_trailer_item(in_tok);
break;
case EXISTS_ADD:
add_arg_to_input_list(on_tok, arg_tok,
in_tok_first, in_tok_last);
break;
case EXISTS_ADD_IF_DIFFERENT:
if (check_if_different(in_tok, arg_tok, 1))
add_arg_to_input_list(on_tok, arg_tok,
in_tok_first, in_tok_last);
else
free_trailer_item(arg_tok);
break;
case EXISTS_ADD_IF_DIFFERENT_NEIGHBOR:
if (check_if_different(on_tok, arg_tok, 0))
add_arg_to_input_list(on_tok, arg_tok,
in_tok_first, in_tok_last);
else
free_trailer_item(arg_tok);
break;
}
}
static void apply_arg_if_missing(struct trailer_item **in_tok_first,
struct trailer_item **in_tok_last,
struct trailer_item *arg_tok)
{
struct trailer_item **in_tok;
enum action_where where;
switch (arg_tok->conf.if_missing) {
case MISSING_DO_NOTHING:
free_trailer_item(arg_tok);
break;
case MISSING_ADD:
where = arg_tok->conf.where;
in_tok = after_or_end(where) ? in_tok_last : in_tok_first;
if (*in_tok) {
add_arg_to_input_list(*in_tok, arg_tok,
in_tok_first, in_tok_last);
} else {
*in_tok_first = arg_tok;
*in_tok_last = arg_tok;
}
break;
}
}
static int find_same_and_apply_arg(struct trailer_item **in_tok_first,
struct trailer_item **in_tok_last,
struct trailer_item *arg_tok)
{
struct trailer_item *in_tok;
struct trailer_item *on_tok;
struct trailer_item *following_tok;
enum action_where where = arg_tok->conf.where;
int middle = (where == WHERE_AFTER) || (where == WHERE_BEFORE);
int backwards = after_or_end(where);
struct trailer_item *start_tok = backwards ? *in_tok_last : *in_tok_first;
for (in_tok = start_tok; in_tok; in_tok = following_tok) {
following_tok = backwards ? in_tok->previous : in_tok->next;
if (!same_token(in_tok, arg_tok))
continue;
on_tok = middle ? in_tok : start_tok;
apply_arg_if_exists(in_tok, arg_tok, on_tok,
in_tok_first, in_tok_last);
return 1;
}
return 0;
}
static void process_trailers_lists(struct trailer_item **in_tok_first,
struct trailer_item **in_tok_last,
struct trailer_item **arg_tok_first)
{
struct trailer_item *arg_tok;
struct trailer_item *next_arg;
if (!*arg_tok_first)
return;
for (arg_tok = *arg_tok_first; arg_tok; arg_tok = next_arg) {
int applied = 0;
next_arg = arg_tok->next;
remove_from_list(arg_tok, arg_tok_first, NULL);
applied = find_same_and_apply_arg(in_tok_first,
in_tok_last,
arg_tok);
if (!applied)
apply_arg_if_missing(in_tok_first,
in_tok_last,
arg_tok);
}
}