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parse-options new features.

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options flags:
~~~~~~~~~~~~~
  PARSE_OPT_NONEG allow the caller to disallow the negated option to exists.

option types:
~~~~~~~~~~~~
  OPTION_BIT: ORs (or NANDs) a mask.
  OPTION_SET_INT: force the value to be set to this integer.
  OPTION_SET_PTR: force the value to be set to this pointer.

helper:
~~~~~~
  HAS_MULTI_BITS (in git-compat-util.h) is a bit-hack to check if an
  unsigned integer has more than one bit set, useful to check if conflicting
  options have been used.

Signed-off-by: Pierre Habouzit <madcoder@debian.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Pierre Habouzit 2007-11-07 11:20:27 +01:00 committed by Junio C Hamano
parent 40e2524da9
commit db7244bd5b
3 changed files with 59 additions and 18 deletions
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1
git-compat-util.h
View File

@ -20,6 +20,7 @@
#endif
#define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (sizeof(x) * 8 - (bits))))
#define HAS_MULTI_BITS(i) ((i) & ((i) - 1)) /* checks if an integer has more than 1 bit set */
/* Approximation of the length of the decimal representation of this type. */
#define decimal_length(x) ((int)(sizeof(x) * 2.56 + 0.5) + 1)

61
parse-options.c
View File

@ -40,24 +40,53 @@ static int get_value(struct optparse_t *p,
const struct option *opt, int flags)
{
const char *s, *arg;
arg = p->opt ? p->opt : (p->argc > 1 ? p->argv[1] : NULL);
const int unset = flags & OPT_UNSET;
if (p->opt && (flags & OPT_UNSET))
if (unset && p->opt)
return opterror(opt, "takes no value", flags);
if (unset && (opt->flags & PARSE_OPT_NONEG))
return opterror(opt, "isn't available", flags);
switch (opt->type) {
case OPTION_BOOLEAN:
if (!(flags & OPT_SHORT) && p->opt)
if (!(flags & OPT_SHORT) && p->opt) {
switch (opt->type) {
case OPTION_CALLBACK:
if (!(opt->flags & PARSE_OPT_NOARG))
break;
/* FALLTHROUGH */
case OPTION_BOOLEAN:
case OPTION_BIT:
case OPTION_SET_INT:
case OPTION_SET_PTR:
return opterror(opt, "takes no value", flags);
if (flags & OPT_UNSET)
*(int *)opt->value = 0;
default:
break;
}
}
arg = p->opt ? p->opt : (p->argc > 1 ? p->argv[1] : NULL);
switch (opt->type) {
case OPTION_BIT:
if (unset)
*(int *)opt->value &= ~opt->defval;
else
(*(int *)opt->value)++;
*(int *)opt->value |= opt->defval;
return 0;
case OPTION_BOOLEAN:
*(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
return 0;
case OPTION_SET_INT:
*(int *)opt->value = unset ? 0 : opt->defval;
return 0;
case OPTION_SET_PTR:
*(void **)opt->value = unset ? NULL : (void *)opt->defval;
return 0;
case OPTION_STRING:
if (flags & OPT_UNSET) {
*(const char **)opt->value = (const char *)NULL;
if (unset) {
*(const char **)opt->value = NULL;
return 0;
}
if (opt->flags & PARSE_OPT_OPTARG && (!arg || *arg == '-')) {
@ -70,13 +99,10 @@ static int get_value(struct optparse_t *p,
return 0;
case OPTION_CALLBACK:
if (flags & OPT_UNSET)
if (unset)
return (*opt->callback)(opt, NULL, 1);
if (opt->flags & PARSE_OPT_NOARG) {
if (p->opt && !(flags & OPT_SHORT))
return opterror(opt, "takes no value", flags);
if (opt->flags & PARSE_OPT_NOARG)
return (*opt->callback)(opt, NULL, 0);
}
if (opt->flags & PARSE_OPT_OPTARG && (!arg || *arg == '-'))
return (*opt->callback)(opt, NULL, 0);
if (!arg)
@ -84,7 +110,7 @@ static int get_value(struct optparse_t *p,
return (*opt->callback)(opt, get_arg(p), 0);
case OPTION_INTEGER:
if (flags & OPT_UNSET) {
if (unset) {
*(int *)opt->value = 0;
return 0;
}
@ -292,7 +318,7 @@ void usage_with_options(const char * const *usagestr,
pos += fprintf(stderr, " ...");
}
break;
default:
default: /* OPTION_{BIT,BOOLEAN,SET_INT,SET_PTR} */
break;
}
@ -311,6 +337,7 @@ void usage_with_options(const char * const *usagestr,
/*----- some often used options -----*/
#include "cache.h"
int parse_opt_abbrev_cb(const struct option *opt, const char *arg, int unset)
{
int v;

15
parse-options.h
View File

@ -2,9 +2,15 @@
#define PARSE_OPTIONS_H
enum parse_opt_type {
/* special types */
OPTION_END,
OPTION_GROUP,
OPTION_BOOLEAN,
/* options with no arguments */
OPTION_BIT,
OPTION_BOOLEAN, /* _INCR would have been a better name */
OPTION_SET_INT,
OPTION_SET_PTR,
/* options with arguments (usually) */
OPTION_STRING,
OPTION_INTEGER,
OPTION_CALLBACK,
@ -17,6 +23,7 @@ enum parse_opt_flags {
enum parse_opt_option_flags {
PARSE_OPT_OPTARG = 1,
PARSE_OPT_NOARG = 2,
PARSE_OPT_NONEG = 4,
};
struct option;
@ -49,12 +56,15 @@ typedef int parse_opt_cb(const struct option *, const char *arg, int unset);
* mask of parse_opt_option_flags.
* PARSE_OPT_OPTARG: says that the argument is optionnal (not for BOOLEANs)
* PARSE_OPT_NOARG: says that this option takes no argument, for CALLBACKs
* PARSE_OPT_NONEG: says that this option cannot be negated
*
* `callback`::
* pointer to the callback to use for OPTION_CALLBACK.
*
* `defval`::
* default value to fill (*->value) with for PARSE_OPT_OPTARG.
* OPTION_{BIT,SET_INT,SET_PTR} store the {mask,integer,pointer} to put in
* the value when met.
* CALLBACKS can use it like they want.
*/
struct option {
@ -72,7 +82,10 @@ struct option {
#define OPT_END() { OPTION_END }
#define OPT_GROUP(h) { OPTION_GROUP, 0, NULL, NULL, NULL, (h) }
#define OPT_BIT(s, l, v, h, b) { OPTION_BIT, (s), (l), (v), NULL, (h), 0, NULL, (b) }
#define OPT_BOOLEAN(s, l, v, h) { OPTION_BOOLEAN, (s), (l), (v), NULL, (h) }
#define OPT_SET_INT(s, l, v, h, i) { OPTION_SET_INT, (s), (l), (v), NULL, (h), 0, NULL, (i) }
#define OPT_SET_PTR(s, l, v, h, p) { OPTION_SET_PTR, (s), (l), (v), NULL, (h), 0, NULL, (p) }
#define OPT_INTEGER(s, l, v, h) { OPTION_INTEGER, (s), (l), (v), NULL, (h) }
#define OPT_STRING(s, l, v, a, h) { OPTION_STRING, (s), (l), (v), (a), (h) }
#define OPT_CALLBACK(s, l, v, a, h, f) \