Merge pull request #269552 from adisbladis/lib-matchattrs-list-allocs
lib.attrsets.matchAttrs: Avoid some list allocations when walking structure
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commit
51357572f2
@ -897,7 +897,10 @@ rec {
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recursiveUpdateUntil (path: lhs: rhs: !(isAttrs lhs && isAttrs rhs)) lhs rhs;
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/* Returns true if the pattern is contained in the set. False otherwise.
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/*
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Recurse into every attribute set of the first argument and check that:
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- Each attribute path also exists in the second argument.
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- If the attribute's value is not a nested attribute set, it must have the same value in the right argument.
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Example:
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matchAttrs { cpu = {}; } { cpu = { bits = 64; }; }
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@ -909,16 +912,24 @@ rec {
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matchAttrs =
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# Attribute set structure to match
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pattern:
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# Attribute set to find patterns in
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# Attribute set to check
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attrs:
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assert isAttrs pattern;
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all id (attrValues (zipAttrsWithNames (attrNames pattern) (n: values:
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let pat = head values; val = elemAt values 1; in
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if length values == 1 then false
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else if isAttrs pat then isAttrs val && matchAttrs pat val
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else pat == val
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) [pattern attrs]));
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all
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( # Compare equality between `pattern` & `attrs`.
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attr:
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# Missing attr, not equal.
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attrs ? ${attr} && (
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let
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lhs = pattern.${attr};
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rhs = attrs.${attr};
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in
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# If attrset check recursively
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if isAttrs lhs then isAttrs rhs && matchAttrs lhs rhs
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else lhs == rhs
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)
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)
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(attrNames pattern);
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/* Override only the attributes that are already present in the old set
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useful for deep-overriding.
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@ -831,6 +831,26 @@ runTests {
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};
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};
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testMatchAttrsMatchingExact = {
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expr = matchAttrs { cpu = { bits = 64; }; } { cpu = { bits = 64; }; };
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expected = true;
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};
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testMatchAttrsMismatch = {
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expr = matchAttrs { cpu = { bits = 128; }; } { cpu = { bits = 64; }; };
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expected = false;
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};
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testMatchAttrsMatchingImplicit = {
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expr = matchAttrs { cpu = { }; } { cpu = { bits = 64; }; };
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expected = true;
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};
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testMatchAttrsMissingAttrs = {
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expr = matchAttrs { cpu = {}; } { };
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expected = false;
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};
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testOverrideExistingEmpty = {
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expr = overrideExisting {} { a = 1; };
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expected = {};
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