fast-check
Version:
Property based testing framework for JavaScript (like QuickCheck)
275 lines (274 loc) • 9.13 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;
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 = 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 __values = (this && this.__values) || function (o) {
var m = typeof Symbol === "function" && o[Symbol.iterator], i = 0;
if (m) return m.call(o);
return {
next: function () {
if (o && i >= o.length) o = void 0;
return { value: o && o[i++], done: !o };
}
};
};
exports.__esModule = true;
var StreamHelpers_1 = require("./StreamHelpers");
var Stream = /** @class */ (function () {
// /*DEBUG*/ // no double iteration
// /*DEBUG*/ private isLive: boolean;
/**
* Create a Stream based on `g`
* @param g Underlying data of the Stream
*/
function Stream(g) {
this.g = g;
// /*DEBUG*/ this.isLive = true;
}
/**
* Create an empty stream of T
*/
Stream.nil = function () {
return new Stream(StreamHelpers_1.nilHelper());
};
// /*DEBUG*/ private closeCurrentStream() {
// /*DEBUG*/ if (! this.isLive) throw new Error('Stream has already been closed');
// /*DEBUG*/ this.isLive = false;
// /*DEBUG*/ }
Stream.prototype.next = function () {
return this.g.next();
};
Stream.prototype[Symbol.iterator] = function () {
// /*DEBUG*/ this.closeCurrentStream();
return this.g;
};
/**
* Map all elements of the Stream using `f`
*
* WARNING: It closes the current stream
*
* @param f Mapper function
*/
Stream.prototype.map = function (f) {
// /*DEBUG*/ this.closeCurrentStream();
return new Stream(StreamHelpers_1.mapHelper(this.g, f));
};
/**
* Flat map all elements of the Stream using `f`
*
* WARNING: It closes the current stream
*
* @param f Mapper function
*/
Stream.prototype.flatMap = function (f) {
// /*DEBUG*/ this.closeCurrentStream();
return new Stream(StreamHelpers_1.flatMapHelper(this.g, f));
};
/**
* Drop elements from the Stream while `f(element) === true`
*
* WARNING: It closes the current stream
*
* @param f Drop condition
*/
Stream.prototype.dropWhile = function (f) {
var foundEligible = false;
function helper(v) {
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
if (!(foundEligible || !f(v))) return [3 /*break*/, 2];
foundEligible = true;
return [4 /*yield*/, v];
case 1:
_a.sent();
_a.label = 2;
case 2: return [2 /*return*/];
}
});
}
return this.flatMap(helper);
};
/**
* Drop `n` first elements of the Stream
*
* WARNING: It closes the current stream
*
* @param n Number of elements to drop
*/
Stream.prototype.drop = function (n) {
var idx = 0;
function helper(v) {
return idx++ < n;
}
return this.dropWhile(helper);
};
/**
* Take elements from the Stream while `f(element) === true`
*
* WARNING: It closes the current stream
*
* @param f Take condition
*/
Stream.prototype.takeWhile = function (f) {
// /*DEBUG*/ this.closeCurrentStream();
return new Stream(StreamHelpers_1.takeWhileHelper(this.g, f));
};
/**
* Take `n` first elements of the Stream
*
* WARNING: It closes the current stream
*
* @param n Number of elements to take
*/
Stream.prototype.take = function (n) {
var idx = 0;
function helper(v) {
return idx++ < n;
}
return this.takeWhile(helper);
};
/**
* Filter elements of the Stream
*
* WARNING: It closes the current stream
*
* @param f Elements to keep
*/
Stream.prototype.filter = function (f) {
// /*DEBUG*/ this.closeCurrentStream();
return new Stream(StreamHelpers_1.filterHelper(this.g, f));
};
/**
* Check whether all elements of the Stream are successful for `f`
*
* WARNING: It closes the current stream
*
* @param f Condition to check
*/
Stream.prototype.every = function (f) {
var e_1, _a;
try {
// /*DEBUG*/ this.closeCurrentStream();
for (var _b = __values(this.g), _c = _b.next(); !_c.done; _c = _b.next()) {
var v = _c.value;
if (!f(v)) {
return false;
}
}
}
catch (e_1_1) { e_1 = { error: e_1_1 }; }
finally {
try {
if (_c && !_c.done && (_a = _b["return"])) _a.call(_b);
}
finally { if (e_1) throw e_1.error; }
}
return true;
};
/**
* Check whether one of the elements of the Stream is successful for `f`
*
* WARNING: It closes the current stream
*
* @param f Condition to check
*/
Stream.prototype.has = function (f) {
var e_2, _a;
try {
// /*DEBUG*/ this.closeCurrentStream();
for (var _b = __values(this.g), _c = _b.next(); !_c.done; _c = _b.next()) {
var v = _c.value;
if (f(v)) {
return [true, v];
}
}
}
catch (e_2_1) { e_2 = { error: e_2_1 }; }
finally {
try {
if (_c && !_c.done && (_a = _b["return"])) _a.call(_b);
}
finally { if (e_2) throw e_2.error; }
}
return [false, null];
};
/**
* Join `others` Stream to the current Stream
*
* WARNING: It closes the current stream and the other ones (as soon as it iterates over them)
*
* @param others Streams to join to the current Stream
*/
Stream.prototype.join = function () {
var others = [];
for (var _i = 0; _i < arguments.length; _i++) {
others[_i] = arguments[_i];
}
// /*DEBUG*/ this.closeCurrentStream();
return new Stream(StreamHelpers_1.joinHelper(this.g, others));
};
/**
* Take the `nth` element of the Stream of the last (if it does not exist)
*
* WARNING: It closes the current stream
*
* @param nth Position of the element to extract
*/
Stream.prototype.getNthOrLast = function (nth) {
var e_3, _a;
// /*DEBUG*/ this.closeCurrentStream();
var remaining = nth;
var last = null;
try {
for (var _b = __values(this.g), _c = _b.next(); !_c.done; _c = _b.next()) {
var v = _c.value;
if (remaining-- === 0)
return v;
last = v;
}
}
catch (e_3_1) { e_3 = { error: e_3_1 }; }
finally {
try {
if (_c && !_c.done && (_a = _b["return"])) _a.call(_b);
}
finally { if (e_3) throw e_3.error; }
}
return last;
};
return Stream;
}());
exports.Stream = Stream;
/**
* Create a Stream based on `g`
* @param g Underlying data of the Stream
*/
function stream(g) {
return new Stream(g);
}
exports.stream = stream;