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https://github.com/privatevoid-net/nix-super.git
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Add a primop unsafeGetAttrPos to return the position of an attribute
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commit
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6 changed files with 44 additions and 6 deletions
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@ -410,6 +410,19 @@ void EvalState::mkThunk_(Value & v, Expr * expr)
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}
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void EvalState::mkPos(Value & v, Pos * pos)
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{
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if (pos) {
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mkAttrs(v, 3);
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mkString(*allocAttr(v, sFile), pos->file);
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mkInt(*allocAttr(v, sLine), pos->line);
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mkInt(*allocAttr(v, sColumn), pos->column);
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v.attrs->sort();
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} else
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mkNull(v);
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}
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/* Create a thunk for the delayed computation of the given expression
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in the given environment. But if the expression is a variable,
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then look it up right away. This significantly reduces the number
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@ -1044,11 +1057,7 @@ void ExprConcatStrings::eval(EvalState & state, Env & env, Value & v)
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void ExprPos::eval(EvalState & state, Env & env, Value & v)
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{
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state.mkAttrs(v, 3);
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mkString(*state.allocAttr(v, state.sFile), pos.file);
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mkInt(*state.allocAttr(v, state.sLine), pos.line);
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mkInt(*state.allocAttr(v, state.sColumn), pos.column);
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v.attrs->sort();
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state.mkPos(v, &pos);
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}
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@ -243,6 +243,7 @@ public:
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void mkList(Value & v, unsigned int length);
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void mkAttrs(Value & v, unsigned int expected);
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void mkThunk_(Value & v, Expr * expr);
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void mkPos(Value & v, Pos * pos);
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void concatLists(Value & v, unsigned int nrLists, Value * * lists);
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@ -776,6 +776,19 @@ void prim_getAttr(EvalState & state, Value * * args, Value & v)
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}
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/* Return position information of the specified attribute. */
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void prim_unsafeGetAttrPos(EvalState & state, Value * * args, Value & v)
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{
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string attr = state.forceStringNoCtx(*args[0]);
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state.forceAttrs(*args[1]);
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Bindings::iterator i = args[1]->attrs->find(state.symbols.create(attr));
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if (i == args[1]->attrs->end())
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mkNull(v);
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else
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state.mkPos(v, i->pos);
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}
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/* Dynamic version of the `?' operator. */
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static void prim_hasAttr(EvalState & state, Value * * args, Value & v)
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{
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@ -1201,7 +1214,7 @@ void EvalState::createBaseEnv()
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mkBool(v, false);
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addConstant("false", v);
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v.type = tNull;
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mkNull(v);
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addConstant("null", v);
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mkInt(v, time(0));
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@ -1252,6 +1265,7 @@ void EvalState::createBaseEnv()
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// Sets
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addPrimOp("__attrNames", 1, prim_attrNames);
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addPrimOp("__getAttr", 2, prim_getAttr);
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addPrimOp("__unsafeGetAttrPos", 2, prim_unsafeGetAttrPos);
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addPrimOp("__hasAttr", 2, prim_hasAttr);
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addPrimOp("__isAttrs", 1, prim_isAttrs);
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addPrimOp("removeAttrs", 2, prim_removeAttrs);
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@ -116,6 +116,13 @@ static inline void mkBool(Value & v, bool b)
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}
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static inline void mkNull(Value & v)
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{
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v.type = tNull;
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v.app.left = v.app.right = 00; // scrub
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}
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static inline void mkApp(Value & v, Value & left, Value & right)
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{
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v.type = tApp;
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1
tests/lang/eval-okay-getattrpos.exp
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1
tests/lang/eval-okay-getattrpos.exp
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@ -0,0 +1 @@
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{ column = 5; file = "eval-okay-getattrpos.nix"; line = 3; }
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6
tests/lang/eval-okay-getattrpos.nix
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6
tests/lang/eval-okay-getattrpos.nix
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@ -0,0 +1,6 @@
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let
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as = {
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foo = "bar";
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};
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pos = builtins.unsafeGetAttrPos "foo" as;
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in { inherit (pos) column line; file = baseNameOf pos.file; }
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