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lib/types: add various signed/unsigned int types

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It is sometimes necessary to restrict the domain of integers for configurations,
as well as restricting them to unsigned/positive values.
This commit is contained in:
Profpatsch 2017-08-05 15:06:48 +02:00
parent af424a607c
commit 281d071b6a
1 changed files with 57 additions and 10 deletions
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67
lib/types.nix
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@ -107,17 +107,64 @@ rec {
merge = mergeEqualOption;
};
int = mkOptionType rec {
name = "int";
description = "integer";
check = isInt;
merge = mergeOneOption;
};
int = ints.signed;
# specialized subdomains of int
ints =
let
int = mkOptionType rec {
name = "int";
description = "signed integer";
check = isInt;
merge = mergeOneOption;
};
betweenDesc = lowest: highest:
"${toString lowest} and ${toString highest} (both inclusive).";
between = lowest: highest: assert lowest <= highest;
addCheck int (x: x >= lowest && x <= highest) // {
name = "intBetween";
description = "Integer between ${betweenDesc lowest highest}";
};
ign = lowest: highest: name: docStart:
between lowest highest // {
inherit name;
description = docStart + " Between ${betweenDesc lowest highest}";
};
unsign = bit: range: ign 0 (range - 1)
"unsignedInt${toString bit}" "${toString bit} bit unsigned integer.";
sign = bit: range: ign (0 - (range / 2)) (range / 2 - 1)
"signedInt${toString bit}" "${toString bit} bit signed integer.";
in rec {
/* an int with a fixed range
*
* Example:
* (ints.between 0 100).check (-1)
* => false
* (ints.between 0 100).check (101)
* => false
* (ints.between 0 0).check 0
* => true
*/
inherit between;
unsigned = addCheck types.int (x: x >= 0) // {
name = "unsignedInt";
description = "unsigned integer, meaning >=0";
};
unsigned8 = unsign 8 256;
unsigned16 = unsign 16 65536;
unsigned32 = unsign 32 4294967296;
# the biggest int the nix lexer accepts is 9223372036854775808
# the smallest int the nix lexer accepts is -9223372036854775807
# unsigned64 = unsign 64 18446744073709551616;
signed = int;
signed8 = sign 8 256;
signed16 = sign 16 65536;
signed32 = sign 32 4294967296;
intBetween = min: max:
addCheck types.int (x: x >= min && x <= max) // {
name = "intBetween";
description = "integer between ${toString min} and ${toString max} (both inclusively)";
};
str = mkOptionType {