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util.promise: Support delayed promise execution

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This commit is contained in:
Kim Alvefur 2019-01-05 07:08:24 +01:00
parent 51c1c97fe2
commit a35dd91a12
2 changed files with 26 additions and 5 deletions
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14
spec/util_promise_spec.lua
View file

@ -668,4 +668,18 @@ describe("util.promise", function ()
assert.spy(on_rejected).was_called_with(test_error);
end);
end);
describe("set_nexttick()", function ()
it("works", function ()
local next_tick = spy.new(function (f)
f();
end)
local cb = spy.new();
promise.set_nexttick(next_tick);
promise.new(function (y, _)
y("okay");
end):next(cb);
assert.spy(next_tick).was.called();
assert.spy(cb).was.called_with("okay");
end);
end)
end);

17
util/promise.lua
View file

@ -78,14 +78,20 @@ local function new_resolve_functions(p)
return _resolve, _reject;
end
local next_tick = function (f)
f();
end
local function new(f)
local p = setmetatable({ _state = "pending", _next = next_pending, _pending_on_fulfilled = {}, _pending_on_rejected = {} }, promise_mt);
if f then
local resolve, reject = new_resolve_functions(p);
local ok, ret = xpcall(f, debug.traceback, resolve, reject);
if not ok and p._state == "pending" then
reject(ret);
end
next_tick(function()
local resolve, reject = new_resolve_functions(p);
local ok, ret = xpcall(f, debug.traceback, resolve, reject);
if not ok and p._state == "pending" then
reject(ret);
end
end);
end
return p;
end
@ -203,4 +209,5 @@ return {
race = race;
try = try;
is_promise = is_promise;
set_nexttick = function(new_next_tick) next_tick = new_next_tick; end;
}