futoin-asyncsteps
Version:
Mimic traditional threads in single threaded event loop
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JavaScript
;
function _typeof(o) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) { return typeof o; } : function (o) { return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o; }, _typeof(o); }
function _classCallCheck(a, n) { if (!(a instanceof n)) throw new TypeError("Cannot call a class as a function"); }
function _defineProperties(e, r) { for (var t = 0; t < r.length; t++) { var o = r[t]; o.enumerable = o.enumerable || !1, o.configurable = !0, "value" in o && (o.writable = !0), Object.defineProperty(e, _toPropertyKey(o.key), o); } }
function _createClass(e, r, t) { return r && _defineProperties(e.prototype, r), t && _defineProperties(e, t), Object.defineProperty(e, "prototype", { writable: !1 }), e; }
function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == _typeof(i) ? i : i + ""; }
function _toPrimitive(t, r) { if ("object" != _typeof(t) || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != _typeof(i)) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
function _slicedToArray(r, e) { return _arrayWithHoles(r) || _iterableToArrayLimit(r, e) || _unsupportedIterableToArray(r, e) || _nonIterableRest(); }
function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }
function _unsupportedIterableToArray(r, a) { if (r) { if ("string" == typeof r) return _arrayLikeToArray(r, a); var t = {}.toString.call(r).slice(8, -1); return "Object" === t && r.constructor && (t = r.constructor.name), "Map" === t || "Set" === t ? Array.from(r) : "Arguments" === t || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(t) ? _arrayLikeToArray(r, a) : void 0; } }
function _arrayLikeToArray(r, a) { (null == a || a > r.length) && (a = r.length); for (var e = 0, n = Array(a); e < a; e++) n[e] = r[e]; return n; }
function _iterableToArrayLimit(r, l) { var t = null == r ? null : "undefined" != typeof Symbol && r[Symbol.iterator] || r["@@iterator"]; if (null != t) { var e, n, i, u, a = [], f = !0, o = !1; try { if (i = (t = t.call(r)).next, 0 === l) { if (Object(t) !== t) return; f = !1; } else for (; !(f = (e = i.call(t)).done) && (a.push(e.value), a.length !== l); f = !0); } catch (r) { o = !0, n = r; } finally { try { if (!f && null != t["return"] && (u = t["return"](), Object(u) !== u)) return; } finally { if (o) throw n; } } return a; } }
function _arrayWithHoles(r) { if (Array.isArray(r)) return r; }
var _require = require('../Errors'),
InternalError = _require.InternalError,
LoopCont = _require.LoopCont,
LoopBreak = _require.LoopBreak;
//---
var makeSym = typeof Symbol === 'undefined' ? function (name) {
return name;
} : function (name) {
return Symbol(name);
};
//---
var LOOP_TERM_LABEL = makeSym('_loop_term_label');
var loop_error = function loop_error(as, err, outer_as, state, label) {
if (err === LoopCont) {
var term_label = state[LOOP_TERM_LABEL];
if (!term_label || term_label === label) {
state.last_exception = null;
// Continue to next iteration
as._root._handle_success();
}
} else if (err === LoopBreak) {
var _term_label = state[LOOP_TERM_LABEL];
if (!_term_label || _term_label === label) {
state.last_exception = null;
outer_as._queue.length = 0;
as._root._handle_success();
}
}
};
var loop = function loop(asi, root, func, label, end_cond) {
if (end_cond && end_cond()) {
return;
}
asi.add(function (outer_as) {
var state = outer_as.state;
var exec_stack = root._exec_stack;
var es_len = exec_stack.length;
var step1 = [func, function (as, err) {
loop_error(as, err, outer_as, state, label);
}];
var step2 = [function (as) {
if (!end_cond || !end_cond()) {
exec_stack.length = es_len; // truncate iteration
create_iteration();
}
}, null];
var create_iteration = function create_iteration() {
outer_as._queue = [step1, step2];
};
create_iteration();
});
};
//---
var repeat = function repeat(asi, root, count, func, label) {
var i = 0;
var c = count;
loop(asi, root, function (as) {
func(as, i++);
}, label, function () {
return i >= c;
});
};
//---
var forEach = function forEach(asi, root, map_or_list, func, label) {
if (Array.isArray(map_or_list)) {
var arr = map_or_list;
repeat(asi, root, arr.length, function (as, i) {
func(as, i, arr[i]);
}, label);
} else if (typeof Map !== 'undefined' && map_or_list instanceof Map) {
var iter = map_or_list.entries();
loop(asi, root, function (as) {
var next = iter.next();
if (next.done) {
as["break"]();
}
var _next$value = _slicedToArray(next.value, 2),
key = _next$value[0],
value = _next$value[1];
func(as, key, value);
}, label);
} else {
var obj = map_or_list;
var keys = Object.keys(obj);
repeat(asi, root, keys.length, function (as, i) {
func(as, keys[i], obj[keys[i]]);
}, label);
}
};
//---
var await_async_error = function await_async_error(asi, root, reason) {
var state = asi.state;
if (state) {
var default_error = 'PromiseReject';
asi._on_cancel = null;
if (reason instanceof Error) {
state.last_exception = reason;
state.error_info = undefined;
root._handle_error(default_error);
} else {
var err = reason || default_error;
state.last_exception = new Error(err);
state.error_info = undefined;
root._handle_error(err);
}
}
};
var as_await = function as_await(asi, root, promise, onerror) {
var step_as;
var complete;
// Attach handlers on the same tick
promise.then(function (result) {
if (step_as) {
if (step_as.state) {
root._burst_success([result]);
}
} else {
complete = function complete() {
root._handle_success([result]);
};
}
}, function (reason) {
if (step_as) {
await_async_error(step_as, root, reason);
} else {
// prevent cancel logic
step_as = null;
if (reason instanceof Error) {
complete = function complete() {
throw reason;
};
} else {
complete = function complete(asi) {
asi.error(reason || 'PromiseReject');
};
}
}
});
asi.add(function (as) {
if (complete) {
complete(as);
} else {
step_as = as;
as._on_cancel = function () {
if (step_as) {
step_as = null;
try {
// BlueBird cancellation
promise.cancel();
} catch (_unused) {
// ignore
}
}
};
}
}, onerror);
};
//---
var prev_queue = function prev_queue(root) {
var stack = root._stack;
var stack_len = stack.length;
return stack_len > 1 ? stack[stack_len - 2]._queue : root._queue;
};
//---
var EMPTY_ARRAY = [];
Object.freeze(EMPTY_ARRAY);
//---
var noop = function noop() {};
//---
module.exports = exports = {
noop: noop,
makeSym: makeSym,
loop: loop,
repeat: repeat,
forEach: forEach,
LOOP_TERM_LABEL: LOOP_TERM_LABEL,
as_await: as_await,
EMPTY_ARRAY: EMPTY_ARRAY,
prev_queue: prev_queue
};
if (process.env.NODE_ENV === 'production') {
exports.isProduction = true;
exports.checkFunc = noop;
exports.checkOnError = noop;
var fake_exec_stack = new (/*#__PURE__*/function () {
function _class() {
_classCallCheck(this, _class);
}
return _createClass(_class, [{
key: "push",
value: function push() {}
}, {
key: "length",
get: function get() {
return 0;
},
set: function set(l) {}
}]);
}())();
Object.freeze(fake_exec_stack);
exports.newExecStack = function () {
return fake_exec_stack;
};
} else {
exports.isProduction = false;
exports.checkFunc = function (asi, func) {
if (func.length < 1) {
asi.error(InternalError, "Step function must expect at least AsyncStep interface");
}
};
exports.checkOnError = function (asi, onerror) {
if (onerror && onerror.length !== 2) {
asi.error(InternalError, "Error handler must take exactly two arguments");
}
};
exports.newExecStack = function () {
return [];
};
}
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