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lib.concatMap and lib.mapAttrs to be builtins

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This commit is contained in:
volth 2018-07-05 02:52:02 +00:00
parent 3defdccf4b
commit 403a76a18f
5 changed files with 52 additions and 0 deletions
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42
src/libexpr/primops.cc
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@ -1356,6 +1356,24 @@ static void prim_functionArgs(EvalState & state, const Pos & pos, Value * * args
}
/* Apply a function to every element of a list. */
static void prim_mapAttrs(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
state.forceFunction(*args[0], pos);
state.forceAttrs(*args[1], pos);
state.mkAttrs(v, args[1]->attrs->size());
for (auto & i : *args[1]->attrs) {
Value vName, vFun2;
mkString(vName, i.name);
state.callFunction(*args[0], vName, vFun2, pos);
state.callFunction(vFun2, *i.value, *state.allocAttr(v, i.name), pos);
}
}
/*************************************************************
* Lists
*************************************************************/
@ -1627,6 +1645,28 @@ static void prim_partition(EvalState & state, const Pos & pos, Value * * args, V
}
/* concatMap = f: list: concatLists (map f list); */
/* C++-version is to avoid allocating `mkApp', call `f' eagerly */
static void prim_concatMap(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
state.forceFunction(*args[0], pos);
state.forceList(*args[1], pos);
auto len = args[1]->listSize();
Value vList;
state.mkList(vList, len);
for (unsigned int n = 0; n < len; ++n) {
Value * vElem = args[1]->listElems()[n];
state.forceValue(*vElem);
state.callFunction(*args[0], *vElem, *(vList.listElems()[n] = state.allocValue()), pos);
}
state.concatLists(v, len, vList.listElems(), pos);
}
/*************************************************************
* Integer arithmetic
*************************************************************/
@ -2212,6 +2252,7 @@ void EvalState::createBaseEnv()
addPrimOp("__intersectAttrs", 2, prim_intersectAttrs);
addPrimOp("__catAttrs", 2, prim_catAttrs);
addPrimOp("__functionArgs", 1, prim_functionArgs);
addPrimOp("__mapAttrs", 2, prim_mapAttrs);
// Lists
addPrimOp("__isList", 1, prim_isList);
@ -2229,6 +2270,7 @@ void EvalState::createBaseEnv()
addPrimOp("__genList", 2, prim_genList);
addPrimOp("__sort", 2, prim_sort);
addPrimOp("__partition", 2, prim_partition);
addPrimOp("__concatMap", 2, prim_concatMap);
// Integer arithmetic
addPrimOp("__add", 2, prim_add);

1
tests/lang/eval-okay-concatmap.exp Normal file
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@ -0,0 +1 @@
[ [ 1 3 5 7 9 ] [ "a" "z" "b" "z" ] ]

5
tests/lang/eval-okay-concatmap.nix Normal file
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@ -0,0 +1,5 @@
with import ./lib.nix;
[ (builtins.concatMap (x: if x / 2 * 2 == x then [] else [ x ]) (range 0 10))
(builtins.concatMap (x: [x] ++ ["z"]) ["a" "b"])
]

1
tests/lang/eval-okay-mapattrs.exp Normal file
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@ -0,0 +1 @@
{ x = "x-foo"; y = "y-bar"; }

3
tests/lang/eval-okay-mapattrs.nix Normal file
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@ -0,0 +1,3 @@
with import ./lib.nix;
builtins.mapAttrs (name: value: name + "-" + value) { x = "foo"; y = "bar"; }