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Add a primop unsafeGetAttrPos to return the position of an attribute

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This commit is contained in:
Eelco Dolstra 2013-11-18 22:22:35 +01:00
parent fc33fd86b7
commit 285df765b9
6 changed files with 44 additions and 6 deletions
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16
src/libexpr/primops.cc
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@ -776,6 +776,19 @@ void prim_getAttr(EvalState & state, Value * * args, Value & v)
}
/* Return position information of the specified attribute. */
void prim_unsafeGetAttrPos(EvalState & state, Value * * args, Value & v)
{
string attr = state.forceStringNoCtx(*args[0]);
state.forceAttrs(*args[1]);
Bindings::iterator i = args[1]->attrs->find(state.symbols.create(attr));
if (i == args[1]->attrs->end())
mkNull(v);
else
state.mkPos(v, i->pos);
}
/* Dynamic version of the `?' operator. */
static void prim_hasAttr(EvalState & state, Value * * args, Value & v)
{
@ -1201,7 +1214,7 @@ void EvalState::createBaseEnv()
mkBool(v, false);
addConstant("false", v);
v.type = tNull;
mkNull(v);
addConstant("null", v);
mkInt(v, time(0));
@ -1252,6 +1265,7 @@ void EvalState::createBaseEnv()
// Sets
addPrimOp("__attrNames", 1, prim_attrNames);
addPrimOp("__getAttr", 2, prim_getAttr);
addPrimOp("__unsafeGetAttrPos", 2, prim_unsafeGetAttrPos);
addPrimOp("__hasAttr", 2, prim_hasAttr);
addPrimOp("__isAttrs", 1, prim_isAttrs);
addPrimOp("removeAttrs", 2, prim_removeAttrs);