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getAttr can call builtins.getAttr

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svn path=/nixpkgs/trunk/; revision=15694
This commit is contained in:
Marc Weber 2009-05-24 10:57:49 +00:00
parent 3157bb1098
commit ed69e9ed94
1 changed files with 10 additions and 7 deletions
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17
pkgs/lib/attrsets.nix
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@ -1,7 +1,7 @@
# Operations on attribute sets.
with {
inherit (builtins) head tail;
inherit (builtins) head tail isString;
inherit (import ./default.nix) fold;
inherit (import ./strings.nix) concatStringsSep;
};
@ -18,13 +18,16 @@ rec {
in
if attrPath == [] then e
else if builtins ? hasAttr && hasAttr attr e
then attrByPath (tail attrPath) default (builtins.getAttr attr e)
then attrByPath (tail attrPath) default (getAttr attr e)
else default;
# keep compatibility for some time. will be removed soon (the name getAttr
# should only be used for the builtins primop)
getAttr = a : b : c : builtins.trace "depreceated usage of lib.getAttr!"
(attrByPath a b c);
getAttr = a : b : if isString a
then
# should have been called from builtins scope. Don't mind. use builtin function
builtins.getAttr a b
else c : builtins.trace "depreceated usage of lib.getAttr!" (attrByPath a b c);
getAttrFromPath = attrPath: set:
@ -39,7 +42,7 @@ rec {
=> [as.a as.b as.c]
*/
attrVals = nameList: set:
map (x: builtins.getAttr x set) nameList;
map (x: getAttr x set) nameList;
/* Return the values of all attributes in the given set, sorted by
@ -59,7 +62,7 @@ rec {
catAttrs "a" [{a = 1;} {b = 0;} {a = 2;}]
=> [1 2]
*/
catAttrs = attr: l: fold (s: l: if hasAttr attr s then [(builtins.getAttr attr s)] ++ l else l) [] l;
catAttrs = attr: l: fold (s: l: if hasAttr attr s then [(getAttr attr s)] ++ l else l) [] l;
/* Utility function that creates a {name, value} pair as expected by
@ -78,7 +81,7 @@ rec {
=> {x = "x-foo"; y = "y-bar";}
*/
mapAttrs = f: set:
listToAttrs (map (attr: nameValuePair attr (f attr (builtins.getAttr attr set))) (attrNames set));
listToAttrs (map (attr: nameValuePair attr (f attr (getAttr attr set))) (attrNames set));
/* Like `mapAttrs', except that it recursively applies itself to