TypeScriptToLua/test/unit/loops.spec.ts at master · TypeScriptToLua/TypeScriptToLua

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import * as tstl from "../../src";

import { LuaTarget } from "../../src";

import { forbiddenForIn } from "../../src/transformation/utils/diagnostics";

import * as util from "../util";

test("while", () => {

util.testFunction`

let arrTest = [0, 1, 2, 3];

let i = 0;

while (i < arrTest.length) {

arrTest[i] = arrTest[i] + 1;

i++;

}

return arrTest;

`.expectToMatchJsResult();

});

util.testEachVersion(

"while with continue",

() => util.testFunction`

let arrTest = [0, 1, 2, 3, 4];

let i = 0;

while (i < arrTest.length) {

if (i % 2 == 0) {

i++;

continue;

}

let j = 2;

while (j > 0) {

if (j == 2) {

j--

continue;

}

arrTest[i] = j;

j--;

}

i++;

}

return arrTest;

util.expectEachVersionExceptJit(builder => builder.expectToMatchJsResult())

);

util.testEachVersion(

"dowhile with continue",

() => util.testFunction`

let arrTest = [0, 1, 2, 3, 4];

let i = 0;

do {

if (i % 2 == 0) {

i++;

continue;

}

let j = 2;

do {

if (j == 2) {

j--

continue;

}

arrTest[i] = j;

j--;

} while (j > 0)

i++;

} while (i < arrTest.length)

return arrTest;

util.expectEachVersionExceptJit(builder => builder.expectToMatchJsResult())

);

test("for", () => {

util.testFunction`

let arrTest = [0, 1, 2, 3];

for (let i = 0; i < arrTest.length; ++i) {

arrTest[i] = arrTest[i] + 1;

}

return arrTest;

`.expectToMatchJsResult();

});

test("for with expression", () => {

util.testFunction`

let arrTest = [0, 1, 2, 3];

let i: number;

for (i = 0 * 1; i < arrTest.length; ++i) {

arrTest[i] = arrTest[i] + 1;

}

return arrTest;

`.expectToMatchJsResult();

});

util.testEachVersion(

"for with continue",

() => util.testFunction`

let arrTest = [0, 1, 2, 3, 4];

for (let i = 0; i < arrTest.length; i++) {

if (i % 2 == 0) {

continue;

}

for (let j = 0; j < 2; j++) {

if (j == 1) {

continue;

}

arrTest[i] = j;

}

return arrTest;

util.expectEachVersionExceptJit(builder => builder.expectToMatchJsResult())

);

test("forMirror", () => {

util.testFunction`

let arrTest = [0, 1, 2, 3];

for (let i = 0; arrTest.length > i; i++) {

arrTest[i] = arrTest[i] + 1;

}

return arrTest;

`.expectToMatchJsResult();

});

test("forBreak", () => {

util.testFunction`

let arrTest = [0, 1, 2, 3];

for (let i = 0; i < arrTest.length; ++i) {

break;

arrTest[i] = arrTest[i] + 1;

}

return arrTest;

`.expectToMatchJsResult();

});

test("forNoDeclarations", () => {

util.testFunction`

let arrTest = [0, 1, 2, 3];

let i = 0;

for (; i < arrTest.length; ++i) {

arrTest[i] = arrTest[i] + 1;

}

return arrTest;

`.expectToMatchJsResult();

});

test("forNoCondition", () => {

util.testFunction`

let arrTest = [0, 1, 2, 3];

let i = 0;

for (;; ++i) {

if (i >= arrTest.length) {

break;

}

arrTest[i] = arrTest[i] + 1;

}

return arrTest;

`.expectToMatchJsResult();

});

test("forNoPostExpression", () => {

util.testFunction`

let arrTest = [0, 1, 2, 3];

let i = 0;

for (;;) {

if (i >= arrTest.length) {

break;

}

arrTest[i] = arrTest[i] + 1;

i++;

}

return arrTest;

`.expectToMatchJsResult();

});

test.each([

{ inp: [0, 1, 2, 3], header: "let i = 0; i < arrTest.length; i++" },

{ inp: [0, 1, 2, 3], header: "let i = 0; i <= arrTest.length - 1; i++" },

{ inp: [0, 1, 2, 3], header: "let i = 0; arrTest.length > i; i++" },

{ inp: [0, 1, 2, 3], header: "let i = 0; arrTest.length - 1 >= i; i++" },

{ inp: [0, 1, 2, 3], header: "let i = 0; i < arrTest.length; i += 2" },

{ inp: [0, 1, 2, 3], header: "let i = arrTest.length - 1; i >= 0; i--" },

{ inp: [0, 1, 2, 3], header: "let i = arrTest.length - 1; i >= 0; i -= 2" },

{ inp: [0, 1, 2, 3], header: "let i = arrTest.length - 1; i > 0; i -= 2" },

])("forheader (%p)", ({ inp, header }) => {

util.testFunction`

let arrTest = ${util.formatCode(inp)};

for (${header}) {

arrTest[i] = arrTest[i] + 1;

}

return arrTest;

`.expectToMatchJsResult();

});

test("for scope", () => {

util.testFunction`

let i = 42;

for (let i = 0; i < 10; ++i) {}

return i;

`.expectToMatchJsResult();

});

test.each([

{

inp: { test1: 0, test2: 1, test3: 2 },

])("forin[Object] (%p)", ({ inp }) => {

util.testFunctionTemplate`

let objTest = ${inp};

for (let key in objTest) {

objTest[key] = objTest[key] + 1;

}

return objTest;

`.expectToMatchJsResult();

});

test("forin[Array]", () => {

util.testFunction`

const array = [];

for (const key in array) {}

`.expectDiagnosticsToMatchSnapshot([forbiddenForIn.code]);

});

const luaTargetsExceptJit = [

LuaTarget.Lua50,

LuaTarget.Lua51,

LuaTarget.Lua52,

LuaTarget.Lua53,

LuaTarget.Lua54,

LuaTarget.Universal,

];

test.each(

luaTargetsExceptJit.flatMap(target =>

[{ inp: { a: 0, b: 1, c: 2, d: 3, e: 4 } }].map(testCase => [target, testCase] as const)

)

)("forin with continue (%s %p)", (luaTarget, { inp }) => {

util.testFunctionTemplate`

let obj = ${inp};

for (let i in obj) {

if (obj[i] % 2 == 0) {

continue;

}

obj[i] = 0;

}

return obj;

.setOptions({ luaTarget })

.expectToMatchJsResult();

});

test.each([{ inp: [0, 1, 2] }])("forof (%p)", ({ inp }) => {

util.testFunctionTemplate`

let objTest = ${inp};

let arrResultTest = [];

for (let value of objTest) {

arrResultTest.push(value + 1)

}

return arrResultTest;

`.expectToMatchJsResult();

});

test("Tuple loop", () => {

util.testFunction`

const tuple: [number, number, number] = [3,5,1];

let count = 0;

for (const value of tuple) { count += value; }

return count;

`.expectToMatchJsResult();

});

test("forof existing variable", () => {

util.testFunction`

let objTest = [0, 1, 2];

let arrResultTest = [];

let value: number;

for (value of objTest) {

arrResultTest.push(value + 1)

}

return arrResultTest;

`.expectToMatchJsResult();

});

test("forof destructing", () => {

const input = [

[1, 2],

[2, 3],

[3, 4],

];

util.testFunction`

let objTest = ${util.formatCode(input)};

let arrResultTest = [];

for (let [a,b] of objTest) {

arrResultTest.push(a + b)

}

return arrResultTest;

`.expectToMatchJsResult();

});

test("forof destructing scope", () => {

util.testFunction`

let x = 7;

for (let [x] of [[1], [2], [3]]) {

x *= 2;

}

return x;

`.expectToMatchJsResult();

});

// This catches the case where x is falsely seen as globally scoped and the 'local' is stripped out

test("forof destructing scope (global)", () => {

util.testModule`

let x = 7;

for (let [x] of [[1], [2], [3]]) {

x *= 2;

}

if (x !== 7) throw x;

`.expectNoExecutionError();

});

test("forof nested destructing", () => {

util.testFunction`

const obj = { a: [3], b: [5] };

let result = 0;

for(const [k, [v]] of Object.entries(obj)){

result += v;

}

return result;

`.expectToMatchJsResult();

});

test("forof destructing with existing variables", () => {

const input = [

[1, 2],

[2, 3],

[3, 4],

];

util.testFunction`

let objTest = ${util.formatCode(input)};

let arrResultTest = [];

let a: number;

let b: number;

for ([a,b] of objTest) {

arrResultTest.push(a + b)

}

return arrResultTest;

`.expectToMatchJsResult();

});

util.testEachVersion(

"forof with continue",

() => util.testFunction`

let testArr = [0, 1, 2, 3, 4];

let a = 0;

for (let i of testArr) {

if (i % 2 == 0) {

a++;

continue;

}

for (let j of [0, 1]) {

if (j == 1) {

continue;

}

testArr[a] = j;

}

a++;

}

return testArr;

util.expectEachVersionExceptJit(builder => builder.expectToMatchJsResult())

);

test("forof with iterator", () => {

util.testFunction`

const arr = ["a", "b", "c"];

function iter(): IterableIterator<string> {

let i = 0;

return {

[Symbol.iterator]() { return this; },

next() { return {value: arr[i], done: i++ >= arr.length} },

}

let result = "";

for (let e of iter()) {

result += e;

}

return result;

`.expectToMatchJsResult();

});

test("forof with iterator and existing variable", () => {

util.testFunction`

const arr = ["a", "b", "c"];

function iter(): IterableIterator<string> {

let i = 0;

return {

[Symbol.iterator]() { return this; },

next() { return {value: arr[i], done: i++ >= arr.length} },

}

let result = "";

let e: string;

for (e of iter()) {

result += e;

}

return result;

`.expectToMatchJsResult();

});

test("forof destructuring with iterator", () => {

util.testFunction`

const arr = ["a", "b", "c"];

function iter(): IterableIterator<[string, string]> {

let i = 0;

return {

[Symbol.iterator]() { return this; },

next() { return {value: [i.toString(), arr[i]], done: i++ >= arr.length} },

}

let result = "";

for (let [a, b] of iter()) {

result += a + b;

}

return result;

`.expectToMatchJsResult();

});

test("forof destructuring with iterator and existing variables", () => {

util.testFunction`

const arr = ["a", "b", "c"];

function iter(): IterableIterator<[string, string]> {

let i = 0;

return {

[Symbol.iterator]() { return this; },

next() { return {value: [i.toString(), arr[i]], done: i++ >= arr.length} },

}

let result = "";

let a: string;

let b: string;

for ([a, b] of iter()) {

result += a + b;

}

return result;

`.expectToMatchJsResult();

});

test("forof array which modifies length", () => {

util.testFunction`

const arr = ["a", "b", "c"];

let result = "";

for (const v of arr) {

if (v === "a") {

arr.push("d");

}

result += v;

}

return result;

`.expectToMatchJsResult();

});

test("forof nested destructuring", () => {

util.testFunction`

let result = 0;

for (const [[x]] of [[[1]]]) {

result = x;

}

return result;

`.expectToMatchJsResult();

});

test("forof with array typed as iterable", () => {

util.testFunction`

function foo(): Iterable<string> {

return ["A", "B", "C"];

}

let result = "";

for (const x of foo()) {

result += x;

}

return result;

`.expectToMatchJsResult();

});

test.each(["", "abc", "a\0c"])("forof string (%p)", string => {

util.testFunctionTemplate`

const results: string[] = [];

for (const x of ${string}) {

results.push(x);

}

return results;

`.expectToMatchJsResult();

});

describe("for...of empty destructuring", () => {

const declareTests = (destructuringPrefix: string) => {

test("array", () => {

util.testFunction`

const arr = [["a"], ["b"], ["c"]];

let i = 0;

for (${destructuringPrefix}[] of arr) {

++i;

}

return i;

`.expectToMatchJsResult();

});

test("iterable", () => {

util.testFunction`

const iter: Iterable<string[]> = [["a"], ["b"], ["c"]];

let i = 0;

for (${destructuringPrefix}[] of iter) {

++i;

}

return i;

`.expectToMatchJsResult();

});

};

describe("declaration", () => {

declareTests("const ");

});

describe("assignment", () => {

declareTests("");

});

for (const testCase of [

"while (false) { continue; }",

"do { continue; } while (false)",

"for (;;) { continue; }",

"for (const a in {}) { continue; }",

"for (const a of []) { continue; }",

]) {

const expectContinueVariable: util.TapCallback = builder =>

expect(builder.getMainLuaCodeChunk()).toMatch(/local __continue\d+/);

const expectContinueGotoLabel: util.TapCallback = builder =>

expect(builder.getMainLuaCodeChunk()).toMatch(/::__continue\d+::/);

const expectContinueStatement: util.TapCallback = builder =>

expect(builder.getMainLuaCodeChunk()).toMatch("continue;");

util.testEachVersion(`loop continue (${testCase})`, () => util.testModule(testCase), {

[tstl.LuaTarget.Universal]: expectContinueVariable,

[tstl.LuaTarget.Lua50]: expectContinueVariable,

[tstl.LuaTarget.Lua51]: expectContinueVariable,

[tstl.LuaTarget.Lua52]: expectContinueGotoLabel,

[tstl.LuaTarget.Lua53]: expectContinueGotoLabel,

[tstl.LuaTarget.Lua54]: expectContinueGotoLabel,

[tstl.LuaTarget.Lua55]: expectContinueGotoLabel,

[tstl.LuaTarget.LuaJIT]: expectContinueGotoLabel,

[tstl.LuaTarget.Luau]: () => expectContinueStatement,

});

}

// https://github.com/TypeScriptToLua/TypeScriptToLua/issues/1638

test.each([tstl.LuaTarget.Universal, tstl.LuaTarget.Lua50, tstl.LuaTarget.Lua51])(

"no unreachable code when using continue for target %s (#1638)",

target => {

util.testFunction`

let i = 0;

while(++i < 10) continue;

return i;

.setOptions({ luaTarget: target })

.expectToMatchJsResult();

}

);

test("do...while", () => {

util.testFunction`

let result = 0;

do {

++result;

} while (result < 2);

return result;

`.expectToMatchJsResult();

});

test("do...while scoping", () => {

util.testFunction`

let x = 0;

let result = 0;

do {

let x = 1;

++result;

} while (x === 0 && result < 2);

return result;

`.expectToMatchJsResult();

});

test("do...while double-negation", () => {

const builder = util.testFunction`

let result = 0;

do {

++result;

} while (!(result >= 2));

return result;

`.expectToMatchJsResult();

expect(builder.getMainLuaCodeChunk()).not.toMatch("not");

});

test("for...in with pre-defined variable", () => {

const testBuilder = util.testFunction`

const obj = { x: "y", foo: "bar" };

let x = "";

let result = [];

for (x in obj) {

result.push(x);

}

return result;

// Need custom matcher because order is not guaranteed in neither JS nor Lua

expect(testBuilder.getJsExecutionResult()).toEqual(expect.arrayContaining(testBuilder.getLuaExecutionResult()));

});

test("for...in with pre-defined variable keeps last value", () => {

const keyX = "x";

const keyFoo = "foo";

const result = util.testFunction`

const obj = { ${keyX}: "y", ${keyFoo}: "bar" };

let x = "";

for (x in obj) {

}

return x;

`.getLuaExecutionResult();

// Need custom matcher because order is not guaranteed in neither JS nor Lua

expect([keyX, keyFoo]).toContain(result);

});

// https://github.com/TypeScriptToLua/TypeScriptToLua/issues/1631

test("loop variables should not be global (#1631)", () => {

const code = util.testModule`

for (let val = 0; val < 2; ++val) {}

`.getMainLuaCodeChunk();

expect(code).toContain("local val");

});

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