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util.promise: Also support automatic resolution by returning a promise from an on_reject handler

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Originally unimplemented because it wasn't clear to me what the correct behaviour was, but the A+
spec is clear that both onFulfilled and onRejected may return a promise.
This commit is contained in:
Matthew Wild 2018-10-18 12:11:50 +01:00
parent 0d3fa64b96
commit 7bcf751702
1 changed files with 3 additions and 1 deletions
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4
util/promise.lua
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@ -46,7 +46,9 @@ local function new_resolve_functions(p)
local function _reject(e)
if resolved then return; end
resolved = true;
if promise_settle(p, "rejected", next_rejected, p._pending_on_rejected, e) then
if is_promise(e) then
e:next(new_resolve_functions(p));
elseif promise_settle(p, "rejected", next_rejected, p._pending_on_rejected, e) then
p.reason = e;
end
end