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Add getDoc() function

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This commit is contained in:
Eelco Dolstra 2020-08-25 13:31:11 +02:00
parent 2a2121d264
commit f53b5f1058
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3 changed files with 42 additions and 13 deletions
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19
src/libexpr/eval.cc
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@ -563,6 +563,25 @@ Value & EvalState::getBuiltin(const string & name)
}
std::optional<EvalState::Doc> EvalState::getDoc(Value & v)
{
if (v.type == tPrimOp || v.type == tPrimOpApp) {
auto v2 = &v;
while (v2->type == tPrimOpApp)
v2 = v2->primOpApp.left;
if (v2->primOp->doc)
return Doc {
.pos = noPos,
.name = v2->primOp->name,
.arity = v2->primOp->arity,
.args = v2->primOp->args,
.doc = v2->primOp->doc,
};
}
return {};
}
/* Every "format" object (even temporary) takes up a few hundred bytes
of stack space, which is a real killer in the recursive
evaluator. So here are some helper functions for throwing