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Implement conditions on tag

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A condition is formed by:
    <tag> <op> <value>

<tag> is the normal yambar tag. <op> is one of '==', '!=', '<', '<=', '>', or
'>='. <value> is what you wish to compare it to.

'boolean' tags must be used directly. They falsehood is matched with '~':

    <tag>
    ~<tag>

Finally, to match an empty string, one must use ' "" ':
    <tag> <op> ""
This commit is contained in:
Leonardo Gibrowski Faé 2022-04-10 00:10:07 -03:00
parent 4496d82cfb
commit 2b103b7acd
11 changed files with 416 additions and 75 deletions
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8
tag.h
View file

@ -3,6 +3,13 @@
#include <stddef.h>
#include <stdbool.h>
enum tag_type {
TAG_TYPE_BOOL,
TAG_TYPE_INT,
TAG_TYPE_FLOAT,
TAG_TYPE_STRING,
};
enum tag_realtime_unit {
TAG_REALTIME_NONE,
TAG_REALTIME_SECS,
@ -17,6 +24,7 @@ struct tag {
void (*destroy)(struct tag *tag);
const char *(*name)(const struct tag *tag);
enum tag_type (*type)(const struct tag *tag);
const char *(*as_string)(const struct tag *tag);
long (*as_int)(const struct tag *tag);
bool (*as_bool)(const struct tag *tag);