Elektra
0.8.16
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This plugin uses if-then-else like conditions.
Stored in the metakey check/condition
to validate data is:
(IF-condition) ? (THEN-condition) : (ELSE-condition)
where the ELSE-condition is optional
Condition: Key
Operation `('String' | '1234.56' | Key | '')`
Operations: !=, ==, <, <=, =>, >, :=
, where:
:=
is used to set a key value(! a/key)
evaluates to true if the key a/key
doesn't exist, to false if it exists.
`(IF-condition) ? ('ThenValue') : ('ElseValue')`
Depending on if the condition is met, either 'ThenValue' or 'ElseValue' will be assigned as key value if the metakey assign/condition
is used.
Multiple conditions can be nested and combined using parentheses and &&
(logical AND) or ||
(logical OR). Additional parentheses must be used to form valid conditions again. (
(condition 1) && (condition 2)
)
The condition/validsuffix
can be used to define a list of valid suffixes to numeric values. If two operants have the same valid suffix or one of them no suffix they will be treated by their numeric value ignoring their suffix. `condition/validsuffix = 'm', 'cm', 'km'would treat
2.3mjust as the numeric value
2.3` when comparing to another value having the same or no suffix.
`(this/key != 'value') ? (then/key == some/other/key) : (or/key <= '125')`
Meaning: IF this/key
NOT EQUAL TO 'value'
THEN then/key
MUST EQUAL some/other/key
ELSE or/key
MUST BE LESS THAN 125
Another full example:
kdb mount conditionals.dump /tmount/conditionals conditionals dump kdb set user/tmount/conditionals/fkey 3.0 kdb set user/tmount/conditionals/hkey hello kdb setmeta user/tmount/conditionals/key check/condition "(hkey == 'hello') ? (fkey == '3.0')" # success kdb setmeta user/tmount/conditionals/key check/condition "(hkey == 'hello') ? (fkey == '5.0')" # fail
Assignment example:
kdb mount conditionals.dump /tmount/conditionals conditionals dump kdb set user/tmount/conditionals/hkey Hello kdb setmeta user/tmount/conditionals/hkey assign/condition "(hkey == 'Hello') ? ('World')" kdb get user/tmount/conditionals/hkey # output: World