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config: make parsing stack struct independent from actual data source 

To simplify adding other sources we extract all functions needed for
parsing into a list of callbacks. We implement those callbacks for the
current file parsing. A new source can implement its own set of callbacks.

Instead of storing the concrete FILE pointer for parsing we store a void
pointer. A new source can use this to store its custom data.

Signed-off-by: Heiko Voigt <hvoigt@hvoigt.net>
Acked-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Heiko Voigt 2013-07-12 00:44:39 +02:00 committed by Junio C Hamano
parent dbb9a81255
commit 4d8dd1494e
1 changed files with 43 additions and 21 deletions
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64
config.c
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@ -10,20 +10,41 @@
#include "strbuf.h"
#include "quote.h"
typedef struct config_file {
struct config_file *prev;
FILE *f;
struct config_source {
struct config_source *prev;
union {
FILE *file;
} u;
const char *name;
int linenr;
int eof;
struct strbuf value;
struct strbuf var;
} config_file;
static config_file *cf;
int (*fgetc)(struct config_source *c);
int (*ungetc)(int c, struct config_source *conf);
long (*ftell)(struct config_source *c);
};
static struct config_source *cf;
static int zlib_compression_seen;
static int config_file_fgetc(struct config_source *conf)
{
return fgetc(conf->u.file);
}
static int config_file_ungetc(int c, struct config_source *conf)
{
return ungetc(c, conf->u.file);
}
static long config_file_ftell(struct config_source *conf)
{
return ftell(conf->u.file);
}
#define MAX_INCLUDE_DEPTH 10
static const char include_depth_advice[] =
"exceeded maximum include depth (%d) while including\n"
@ -168,15 +189,13 @@ int git_config_from_parameters(config_fn_t fn, void *data)
static int get_next_char(void)
{
int c;
FILE *f = cf->f;
int c = cf->fgetc(cf);
c = fgetc(f);
if (c == '\r') {
/* DOS like systems */
c = fgetc(f);
c = cf->fgetc(cf);
if (c != '\n') {
ungetc(c, f);
cf->ungetc(c, cf);
c = '\r';
}
}
@ -336,7 +355,7 @@ static int get_base_var(struct strbuf *name)
}
}
static int git_parse_file(config_fn_t fn, void *data)
static int git_parse_source(config_fn_t fn, void *data)
{
int comment = 0;
int baselen = 0;
@ -894,10 +913,11 @@ int git_default_config(const char *var, const char *value, void *dummy)
}
/*
* The fields f and name of top need to be initialized before calling
* All source specific fields in the union, name and the callbacks
* fgetc, ungetc, ftell of top need to be initialized before calling
* this function.
*/
static int do_config_from(struct config_file *top, config_fn_t fn, void *data)
static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
{
int ret;
@ -909,7 +929,7 @@ static int do_config_from(struct config_file *top, config_fn_t fn, void *data)
strbuf_init(&top->var, 1024);
cf = top;
ret = git_parse_file(fn, data);
ret = git_parse_source(fn, data);
/* pop config-file parsing state stack */
strbuf_release(&top->value);
@ -926,10 +946,13 @@ int git_config_from_file(config_fn_t fn, const char *filename, void *data)
ret = -1;
if (f) {
config_file top;
struct config_source top;
top.f = f;
top.u.file = f;
top.name = filename;
top.fgetc = config_file_fgetc;
top.ungetc = config_file_ungetc;
top.ftell = config_file_ftell;
ret = do_config_from(&top, fn, data);
@ -1064,7 +1087,6 @@ static int store_aux(const char *key, const char *value, void *cb)
{
const char *ep;
size_t section_len;
FILE *f = cf->f;
switch (store.state) {
case KEY_SEEN:
@ -1076,7 +1098,7 @@ static int store_aux(const char *key, const char *value, void *cb)
return 1;
}
store.offset[store.seen] = ftell(f);
store.offset[store.seen] = cf->ftell(cf);
store.seen++;
}
break;
@ -1103,19 +1125,19 @@ static int store_aux(const char *key, const char *value, void *cb)
* Do not increment matches: this is no match, but we
* just made sure we are in the desired section.
*/
store.offset[store.seen] = ftell(f);
store.offset[store.seen] = cf->ftell(cf);
/* fallthru */
case SECTION_END_SEEN:
case START:
if (matches(key, value)) {
store.offset[store.seen] = ftell(f);
store.offset[store.seen] = cf->ftell(cf);
store.state = KEY_SEEN;
store.seen++;
} else {
if (strrchr(key, '.') - key == store.baselen &&
!strncmp(key, store.key, store.baselen)) {
store.state = SECTION_SEEN;
store.offset[store.seen] = ftell(f);
store.offset[store.seen] = cf->ftell(cf);
}
}
}