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Make function arguments retain position info

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This allows querying the location of function arguments. E.g.

  builtins.unsafeGetAttrPos "x" (builtins.functionArgs ({ x }: null))

  => { column = 57; file = "/home/infinisil/src/nix/inst/test.nix"; line = 1; }
This commit is contained in:
Silvan Mosberger 2020-04-02 05:03:58 +02:00
parent a7540294cf
commit c34e96f7e0
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GPG Key ID: E8F1E9EAD284E17D
5 changed files with 14 additions and 5 deletions
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3
src/libexpr/nixexpr.hh
View File

@ -209,9 +209,10 @@ struct ExprList : Expr
struct Formal
{
Pos pos;
Symbol name;
Expr * def;
Formal(const Symbol & name, Expr * def) : name(name), def(def) { };
Formal(const Pos & pos, const Symbol & name, Expr * def) : pos(pos), name(name), def(def) { };
};
struct Formals

4
src/libexpr/parser.y
View File

@ -531,8 +531,8 @@ formals
;
formal
: ID { $$ = new Formal(data->symbols.create($1), 0); }
| ID '?' expr { $$ = new Formal(data->symbols.create($1), $3); }
: ID { $$ = new Formal(CUR_POS, data->symbols.create($1), 0); }
| ID '?' expr { $$ = new Formal(CUR_POS, data->symbols.create($1), $3); }
;
%%

7
src/libexpr/primops.cc
View File

@ -1354,9 +1354,12 @@ static void prim_functionArgs(EvalState & state, const Pos & pos, Value * * args
}
state.mkAttrs(v, args[0]->lambda.fun->formals->formals.size());
for (auto & i : args[0]->lambda.fun->formals->formals)
for (auto & i : args[0]->lambda.fun->formals->formals) {
// !!! should optimise booleans (allocate only once)
mkBool(*state.allocAttr(v, i.name), i.def);
Value * value = state.allocValue();
v.attrs->push_back(Attr(i.name, value, &i.pos));
mkBool(*value, i.def);
}
v.attrs->sort();
}

1
tests/lang/eval-okay-getattrpos-functionargs.exp Normal file
View File

@ -0,0 +1 @@
{ column = 11; file = "eval-okay-getattrpos-functionargs.nix"; line = 2; }

4
tests/lang/eval-okay-getattrpos-functionargs.nix Normal file
View File

@ -0,0 +1,4 @@
let
fun = { foo }: {};
pos = builtins.unsafeGetAttrPos "foo" (builtins.functionArgs fun);
in { inherit (pos) column line; file = baseNameOf pos.file; }