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Created Aug 28, 2017

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async-iter.js
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
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;
return g = { next: verb(0), "throw": verb(1), "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 (_) try {
if (f = 1, y && (t = y[op[0] & 2 ? "return" : op[0] ? "throw" : "next"]) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [0, 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 __await = (this && this.__await) || function (v) { return this instanceof __await ? (this.v = v, this) : new __await(v); }
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 = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
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 __asyncValues = (this && this.__asyncIterator) || function (o) {
if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
var m = o[Symbol.asyncIterator];
return m ? m.call(o) : typeof __values === "function" ? __values(o) : o[Symbol.iterator]();
};
define(["require", "exports", "./csv-parser"], function (require, exports, csv_parser_1) {
"use strict";
var _this = this;
Object.defineProperty(exports, "__esModule", { value: true });
Symbol['asyncIterator'] = Symbol();
function asyncRange(from, to) {
return __asyncGenerator(this, arguments, function asyncRange_1() {
var i;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
i = from;
_a.label = 1;
case 1:
if (!(i < to)) return [3 /*break*/, 4];
return [4 /*yield*/, i];
case 2:
_a.sent();
_a.label = 3;
case 3:
i++;
return [3 /*break*/, 1];
case 4: return [2 /*return*/];
}
});
});
}
function syncRange(from, to) {
var i;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
i = from;
_a.label = 1;
case 1:
if (!(i < to)) return [3 /*break*/, 4];
return [4 /*yield*/, i];
case 2:
_a.sent();
_a.label = 3;
case 3:
i++;
return [3 /*break*/, 1];
case 4: return [2 /*return*/];
}
});
}
function timeIt(name, fn) {
return __awaiter(this, void 0, void 0, function () {
var startMs, endMs, elapsedMs;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
startMs = Date.now();
return [4 /*yield*/, fn()];
case 1:
_a.sent();
endMs = Date.now();
elapsedMs = endMs - startMs;
console.log(name + ": " + elapsedMs + " ms");
return [2 /*return*/];
}
});
});
}
(function () { return __awaiter(_this, void 0, void 0, function () {
var _this = this;
return __generator(this, function (_a) {
switch (_a.label) {
case 0: return [4 /*yield*/, timeIt('sync', function () { return __awaiter(_this, void 0, void 0, function () {
var _i, _a, i;
return __generator(this, function (_b) {
// Note: for this to work, you need target: es6.
for (_i = 0, _a = syncRange(0, 549996); _i < _a.length; _i++) {
i = _a[_i];
}
return [2 /*return*/];
});
}); })];
case 1:
_a.sent();
return [4 /*yield*/, timeIt('async', function () { return __awaiter(_this, void 0, void 0, function () {
var _a, _b, i, e_1_1, e_1, _c;
return __generator(this, function (_d) {
switch (_d.label) {
case 0:
_d.trys.push([0, 6, 7, 12]);
_a = __asyncValues(asyncRange(0, 549996));
_d.label = 1;
case 1: return [4 /*yield*/, _a.next()];
case 2:
if (!(_b = _d.sent(), !_b.done)) return [3 /*break*/, 5];
return [4 /*yield*/, _b.value];
case 3:
i = _d.sent();
_d.label = 4;
case 4: return [3 /*break*/, 1];
case 5: return [3 /*break*/, 12];
case 6:
e_1_1 = _d.sent();
e_1 = { error: e_1_1 };
return [3 /*break*/, 12];
case 7:
_d.trys.push([7, , 10, 11]);
if (!(_b && !_b.done && (_c = _a.return))) return [3 /*break*/, 9];
return [4 /*yield*/, _c.call(_a)];
case 8:
_d.sent();
_d.label = 9;
case 9: return [3 /*break*/, 11];
case 10:
if (e_1) throw e_1.error;
return [7 /*endfinally*/];
case 11: return [7 /*endfinally*/];
case 12: return [2 /*return*/];
}
});
}); })];
case 2:
_a.sent();
return [4 /*yield*/, timeIt('lines', function () { return __awaiter(_this, void 0, void 0, function () {
var numLines, numBytes, _a, _b, line, e_2_1, e_2, _c;
return __generator(this, function (_d) {
switch (_d.label) {
case 0:
numLines = 0, numBytes = 0;
_d.label = 1;
case 1:
_d.trys.push([1, 7, 8, 13]);
_a = __asyncValues(csv_parser_1.lines('stop_times.txt'));
_d.label = 2;
case 2: return [4 /*yield*/, _a.next()];
case 3:
if (!(_b = _d.sent(), !_b.done)) return [3 /*break*/, 6];
return [4 /*yield*/, _b.value];
case 4:
line = _d.sent();
numLines++;
numBytes += line.length;
_d.label = 5;
case 5: return [3 /*break*/, 2];
case 6: return [3 /*break*/, 13];
case 7:
e_2_1 = _d.sent();
e_2 = { error: e_2_1 };
return [3 /*break*/, 13];
case 8:
_d.trys.push([8, , 11, 12]);
if (!(_b && !_b.done && (_c = _a.return))) return [3 /*break*/, 10];
return [4 /*yield*/, _c.call(_a)];
case 9:
_d.sent();
_d.label = 10;
case 10: return [3 /*break*/, 12];
case 11:
if (e_2) throw e_2.error;
return [7 /*endfinally*/];
case 12: return [7 /*endfinally*/];
case 13:
console.log("Read " + numLines + " lines, " + numBytes + " bytes.");
return [2 /*return*/];
}
});
}); })];
case 3:
_a.sent();
return [4 /*yield*/, timeIt('lines chunked', function () { return __awaiter(_this, void 0, void 0, function () {
var numLines, numBytes, _a, _b, chunk, _i, chunk_1, line, e_3_1, e_3, _c;
return __generator(this, function (_d) {
switch (_d.label) {
case 0:
numLines = 0, numBytes = 0;
_d.label = 1;
case 1:
_d.trys.push([1, 7, 8, 13]);
_a = __asyncValues(csv_parser_1.lineChunks('stop_times.txt'));
_d.label = 2;
case 2: return [4 /*yield*/, _a.next()];
case 3:
if (!(_b = _d.sent(), !_b.done)) return [3 /*break*/, 6];
return [4 /*yield*/, _b.value];
case 4:
chunk = _d.sent();
for (_i = 0, chunk_1 = chunk; _i < chunk_1.length; _i++) {
line = chunk_1[_i];
numLines++;
numBytes += line.length;
}
_d.label = 5;
case 5: return [3 /*break*/, 2];
case 6: return [3 /*break*/, 13];
case 7:
e_3_1 = _d.sent();
e_3 = { error: e_3_1 };
return [3 /*break*/, 13];
case 8:
_d.trys.push([8, , 11, 12]);
if (!(_b && !_b.done && (_c = _a.return))) return [3 /*break*/, 10];
return [4 /*yield*/, _c.call(_a)];
case 9:
_d.sent();
_d.label = 10;
case 10: return [3 /*break*/, 12];
case 11:
if (e_3) throw e_3.error;
return [7 /*endfinally*/];
case 12: return [7 /*endfinally*/];
case 13:
console.log("Read " + numLines + " lines, " + numBytes + " bytes.");
return [2 /*return*/];
}
});
}); })];
case 4:
_a.sent();
return [2 /*return*/];
}
});
}); })().catch(function (e) {
console.error(e);
});
});
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