itertools-ts
Version:
Extended itertools port for TypeScript and JavaScript. Provides a huge set of functions for working with iterable collections (including async ones)
250 lines • 11 kB
JavaScript
"use strict";
var __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g = Object.create((typeof Iterator === "function" ? Iterator : Object).prototype);
return g.next = verb(0), g["throw"] = verb(1), g["return"] = verb(2), typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f) throw new TypeError("Generator is already executing.");
while (g && (g = 0, op[0] && (_ = 0)), _) try {
if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [op[0] & 2, t.value];
switch (op[0]) {
case 0: case 1: t = op; break;
case 4: _.label++; return { value: op[1], done: false };
case 5: _.label++; y = op[1]; op = [0]; continue;
case 7: op = _.ops.pop(); _.trys.pop(); continue;
default:
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
if (t[2]) _.ops.pop();
_.trys.pop(); continue;
}
op = body.call(thisArg, _);
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
var __asyncValues = (this && this.__asyncValues) || function (o) {
if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
var m = o[Symbol.asyncIterator], i;
return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
};
var __await = (this && this.__await) || function (v) { return this instanceof __await ? (this.v = v, this) : new __await(v); }
var __asyncDelegator = (this && this.__asyncDelegator) || function (o) {
var i, p;
return i = {}, verb("next"), verb("throw", function (e) { throw e; }), verb("return"), i[Symbol.iterator] = function () { return this; }, i;
function verb(n, f) { i[n] = o[n] ? function (v) { return (p = !p) ? { value: __await(o[n](v)), done: false } : f ? f(v) : v; } : f; }
};
var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _arguments, generator) {
if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
var g = generator.apply(thisArg, _arguments || []), i, q = [];
return i = Object.create((typeof AsyncIterator === "function" ? AsyncIterator : Object).prototype), verb("next"), verb("throw"), verb("return", awaitReturn), i[Symbol.asyncIterator] = function () { return this; }, i;
function awaitReturn(f) { return function (v) { return Promise.resolve(v).then(f, reject); }; }
function verb(n, f) { if (g[n]) { i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; if (f) i[n] = f(i[n]); } }
function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
function fulfill(value) { resume("next", value); }
function reject(value) { resume("throw", value); }
function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
};
var __read = (this && this.__read) || function (o, n) {
var m = typeof Symbol === "function" && o[Symbol.iterator];
if (!m) return o;
var i = m.call(o), r, ar = [], e;
try {
while ((n === void 0 || n-- > 0) && !(r = i.next()).done) ar.push(r.value);
}
catch (error) { e = { error: error }; }
finally {
try {
if (r && !r.done && (m = i["return"])) m.call(i);
}
finally { if (e) throw e.error; }
}
return ar;
};
var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
if (pack || arguments.length === 2) for (var i = 0, l = from.length, ar; i < l; i++) {
if (ar || !(i in from)) {
if (!ar) ar = Array.prototype.slice.call(from, 0, i);
ar[i] = from[i];
}
}
return to.concat(ar || Array.prototype.slice.call(from));
};
var __values = (this && this.__values) || function(o) {
var s = typeof Symbol === "function" && Symbol.iterator, m = s && o[s], i = 0;
if (m) return m.call(o);
if (o && typeof o.length === "number") return {
next: function () {
if (o && i >= o.length) o = void 0;
return { value: o && o[i++], done: !o };
}
};
throw new TypeError(s ? "Object is not iterable." : "Symbol.iterator is not defined.");
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.count = count;
exports.cycle = cycle;
exports.cycleAsync = cycleAsync;
exports.repeat = repeat;
var transform_1 = require("./transform");
/**
* Count sequentially forever
*
* @param start (optional, default 1)
* @param step (optional, default 1)
*/
function count(start, step) {
var i;
if (start === void 0) { start = 1; }
if (step === void 0) { step = 1; }
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
i = start;
_a.label = 1;
case 1:
if (!true) return [3 /*break*/, 4];
return [4 /*yield*/, i];
case 2:
_a.sent();
_a.label = 3;
case 3:
i += step;
return [3 /*break*/, 1];
case 4: return [2 /*return*/];
}
});
}
/**
* Cycle through the elements of a collection sequentially forever
*
* @param iterable
*/
function cycle(iterable) {
var data, data_1, data_1_1, datum, e_1_1;
var e_1, _a;
return __generator(this, function (_b) {
switch (_b.label) {
case 0:
data = __spreadArray([], __read((0, transform_1.toIterable)(iterable)), false);
if (data.length === 0) {
return [2 /*return*/];
}
_b.label = 1;
case 1:
if (!true) return [3 /*break*/, 10];
_b.label = 2;
case 2:
_b.trys.push([2, 7, 8, 9]);
data_1 = (e_1 = void 0, __values(data)), data_1_1 = data_1.next();
_b.label = 3;
case 3:
if (!!data_1_1.done) return [3 /*break*/, 6];
datum = data_1_1.value;
return [4 /*yield*/, datum];
case 4:
_b.sent();
_b.label = 5;
case 5:
data_1_1 = data_1.next();
return [3 /*break*/, 3];
case 6: return [3 /*break*/, 9];
case 7:
e_1_1 = _b.sent();
e_1 = { error: e_1_1 };
return [3 /*break*/, 9];
case 8:
try {
if (data_1_1 && !data_1_1.done && (_a = data_1.return)) _a.call(data_1);
}
finally { if (e_1) throw e_1.error; }
return [7 /*endfinally*/];
case 9: return [3 /*break*/, 1];
case 10: return [2 /*return*/];
}
});
}
/**
* Cycle through the elements of a async iterable sequentially forever
*
* @param iterable
*/
function cycleAsync(iterable) {
return __asyncGenerator(this, arguments, function cycleAsync_1() {
var data, _a, _b, _c, datum, e_2_1;
var _d, e_2, _e, _f;
return __generator(this, function (_g) {
switch (_g.label) {
case 0:
data = [];
_g.label = 1;
case 1:
_g.trys.push([1, 8, 9, 14]);
_a = true, _b = __asyncValues((0, transform_1.toAsyncIterable)(iterable));
_g.label = 2;
case 2: return [4 /*yield*/, __await(_b.next())];
case 3:
if (!(_c = _g.sent(), _d = _c.done, !_d)) return [3 /*break*/, 7];
_f = _c.value;
_a = false;
datum = _f;
data.push(datum);
return [4 /*yield*/, __await(datum)];
case 4: return [4 /*yield*/, _g.sent()];
case 5:
_g.sent();
_g.label = 6;
case 6:
_a = true;
return [3 /*break*/, 2];
case 7: return [3 /*break*/, 14];
case 8:
e_2_1 = _g.sent();
e_2 = { error: e_2_1 };
return [3 /*break*/, 14];
case 9:
_g.trys.push([9, , 12, 13]);
if (!(!_a && !_d && (_e = _b.return))) return [3 /*break*/, 11];
return [4 /*yield*/, __await(_e.call(_b))];
case 10:
_g.sent();
_g.label = 11;
case 11: return [3 /*break*/, 13];
case 12:
if (e_2) throw e_2.error;
return [7 /*endfinally*/];
case 13: return [7 /*endfinally*/];
case 14: return [5 /*yield**/, __values(__asyncDelegator(__asyncValues(cycle(data))))];
case 15: return [4 /*yield*/, __await.apply(void 0, [_g.sent()])];
case 16:
_g.sent();
return [2 /*return*/];
}
});
});
}
/**
* Repeat an item forever
*
* @param item
*/
function repeat(item) {
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
if (!true) return [3 /*break*/, 2];
return [4 /*yield*/, item];
case 1:
_a.sent();
return [3 /*break*/, 0];
case 2: return [2 /*return*/];
}
});
}
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