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conf: add possibility to evaluate simple integer math expressions

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It is useful to use the math expressions for the values in configuration.
This patch adds a simple expression evaluation routines (integer only).
The syntax is simplified unix shell (bash) style.

Examples:

	$[1 + 1]
	$[$[2 + 2] / $var1]
	$[0xa0 | 0x05]

As a bonus, the variable substitutions were more abstracted.
The function snd_config_expand_custom() was introduced to be used
for example in the topology pre-precessor.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2021-11-29 14:57:29 +01:00
parent 32d332b786
commit bf528b9066
5 changed files with 389 additions and 18 deletions
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50
test/lsb/config.c
View file

@ -548,6 +548,55 @@ static void test_for_each(void)
ALSA_CHECK(snd_config_delete(c));
}
static int _expand_fcn(snd_config_t **dst, const char *s, void *private_data ATTRIBUTE_UNUSED)
{
if (strcmp(s, "var10") == 0)
return snd_config_imake_integer(dst, NULL, 10);
if (strcmp(s, "var50") == 0)
return snd_config_imake_integer(dst, NULL, 50);
return snd_config_imake_string(dst, NULL, "");
}
static void test_evaluate_string(void)
{
struct {
const char *expr;
long long result;
} *p, e[] = {
{ .expr = "$var10", .result = 10 },
{ .expr = "$var50", .result = 50 },
{ .expr = "$[1+1]", .result = 2 },
{ .expr = "$[10-5]", .result = 5 },
{ .expr = "$[10*5]", .result = 50 },
{ .expr = "$[15/5]", .result = 3 },
{ .expr = "$[12%5]", .result = 2 },
{ .expr = "$[0xaa|0x55]", .result = 0xff },
{ .expr = "$[0xff&0xfc]", .result = 0xfc },
{ .expr = "$[4294967296+10]", .result = 4294967306LL },
{ .expr = "$[$var10+1]", .result = 11 },
{ .expr = "$[$var10 + $var50]", .result = 60 },
{ .expr = "$[ $var10 + $[ $var50 + 10 ] ]", .result = 70 },
{ .expr = NULL, .result = 0 },
};
snd_config_t *dst;
long l;
long long ll;
for (p = e; p->expr; p++) {
ALSA_CHECK(snd_config_evaluate_string(&dst, p->expr, _expand_fcn, NULL));
if (snd_config_get_type(dst) == SND_CONFIG_TYPE_INTEGER) {
ALSA_CHECK(snd_config_get_integer(dst, &l));
TEST_CHECK(l == p->result);
} else if (snd_config_get_type(dst) == SND_CONFIG_TYPE_INTEGER64) {
ALSA_CHECK(snd_config_get_integer64(dst, &ll));
TEST_CHECK(ll == p->result);
} else {
ALSA_CHECK(0);
}
ALSA_CHECK(snd_config_delete(dst));
}
}
int main(void)
{
test_top();
@ -578,5 +627,6 @@ int main(void)
test_get_ascii();
test_iterators();
test_for_each();
test_evaluate_string();
return TEST_EXIT_CODE();
}