matchAttrs
lib.attrsets.matchAttrs
Docs pulled from | This Revision | about 2 hours ago
Recurse into every attribute set of the first argument and check that:
- Each attribute path also exists in the second argument.
- If the attribute's value is not a nested attribute set, it must have the same value in the right argument.
Inputs
pattern-
Attribute set structure to match
attrs-
Attribute set to check
Type
matchAttrs :: AttrSet -> AttrSet -> Bool
Examples
lib.attrsets.matchAttrs usage example
matchAttrs { cpu = {}; } { cpu = { bits = 64; }; }
=> true
Noogle detected
Implementation
The following is the current implementation of this function.
matchAttrs =
pattern:
attrs:
assert isAttrs pattern;
all
( # Compare equality between `pattern` & `attrs`.
attr:
# Missing attr, not equal.
attrs ? ${attr} && (
let
lhs = pattern.${attr};
rhs = attrs.${attr};
in
# If attrset check recursively
if isAttrs lhs then isAttrs rhs && matchAttrs lhs rhs
else lhs == rhs
)
)
(attrNames pattern);