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Copy pathswitch.spec.ts
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664 lines (597 loc) · 15.6 KB
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import * as util from "../util";
test.each([0, 1, 2, 3])("switch (%p)", inp => {
util.testFunction`
let result: number = -1;
switch (<number>${inp}) {
case 0:
result = 0;
break;
case 1:
result = 1;
break;
case 2:
result = 2;
break;
}
return result;
`.expectToMatchJsResult();
});
test.each([0, 1, 2, 3])("switchdefault (%p)", inp => {
util.testFunction`
let result: number = -1;
switch (<number>${inp}) {
case 0:
result = 0;
break;
case 1:
result = 1;
break;
case 2:
result = 2;
break;
default:
result = -2;
break;
}
return result;
`.expectToMatchJsResult();
});
test.each([0, 0, 2, 3, 4, 5, 7])("switchfallthrough (%p)", inp => {
util.testFunction`
let result: number = -1;
switch (<number>${inp}) {
case 0:
result = 0;
case 1:
result = 1;
break;
case 2:
result = 2;
case 3:
case 4:
result = 4;
break;
case 5:
result = 5;
case 6:
result += 10;
break;
case 7:
result = 7;
default:
result = -2;
break;
}
return result;
`.expectToMatchJsResult();
});
test.each([0, 1, 2, 3])("nestedSwitch (%p)", inp => {
util.testFunction`
let result: number = -1;
switch (${inp} as number) {
case 0:
result = 0;
break;
case 1:
switch(${inp} as number) {
case 0:
result = 0;
break;
case 1:
result = 1;
break;
default:
result = -3;
break;
}
break;
case 2:
result = 2;
break;
default:
result = -2;
break;
}
return result;
`.expectToMatchJsResult();
});
test("switch cases scope", () => {
util.testFunction`
switch (0 as number) {
case 0:
let foo: number | undefined = 1;
case 1:
foo = 2;
case 2:
return foo;
}
`.expectToMatchJsResult();
});
test("variable in nested scope does not interfere with case scope", () => {
util.testFunction`
let foo: number = 0;
switch (foo) {
case 0: {
let foo = 1;
}
case 1:
return foo;
}
`.expectToMatchJsResult();
});
test("switch using variable re-declared in cases", () => {
util.testFunction`
let foo: number = 0;
switch (foo) {
case 0:
let foo = true;
case 1:
return foo;
}
`.expectToMatchJsResult();
});
test.each([0, 1, 2])("switch with block statement scope (%p)", inp => {
util.testFunction`
let result: number = -1;
switch (<number>${inp}) {
case 0: {
let x = 0;
result = 0;
break;
}
case 1: {
let x = 1;
result = x;
}
case 2: {
let x = 2;
result = x;
break;
}
}
return result;
`.expectToMatchJsResult();
});
test.each([0, 1, 2, 3])("switchReturn (%p)", inp => {
util.testFunction`
switch (<number>${inp}) {
case 0:
return 0;
break;
case 1:
return 1;
case 2:
return 2;
break;
}
return -1;
`.expectToMatchJsResult();
});
test.each([0, 1, 2, 3])("switchWithBrackets (%p)", inp => {
util.testFunction`
let result: number = -1;
switch (<number>${inp}) {
case 0: {
result = 0;
break;
}
case 1: {
result = 1;
break;
}
case 2: {
result = 2;
break;
}
}
return result;
`.expectToMatchJsResult();
});
test.each([0, 1, 2, 3, 4])("switchWithBracketsBreakInConditional (%p)", inp => {
util.testFunction`
let result: number = -1;
switch (<number>${inp}) {
case 0: {
result = 0;
break;
}
case 1: {
result = 1;
if (result == 1) break;
}
case 2: {
result = 2;
if (result != 2) break;
}
case 3: {
result = 3;
break;
}
}
return result;
`.expectToMatchJsResult();
});
test.each([0, 1, 2, 3])("switchWithBracketsBreakInInternalLoop (%p)", inp => {
util.testFunction`
let result: number = -1;
switch (${inp} as number) {
case 0: {
result = 0;
for (let i = 0; i < 5; i++) {
result++;
if (i >= 2) {
break;
}
}
}
case 1: {
result++;
break;
}
case 2: {
result = 2;
break;
}
}
return result;
`.expectToMatchJsResult();
});
test("switch executes only one clause", () => {
util.testFunction`
let result: number = -1;
switch (2 as number) {
case 0: {
result = 200;
break;
}
case 1: {
result = 100;
break;
}
case 2: {
result = 1;
break;
}
}
return result;
`.expectToMatchJsResult();
});
// https://github.com/TypeScriptToLua/TypeScriptToLua/issues/967
test("switch default case not last - first", () => {
util.testFunction`
switch (3 as number) {
default:
return "wrong";
case 3:
return "right";
}
`.expectToMatchJsResult();
});
test("switch default case not last - second", () => {
util.testFunction`
switch (3 as number) {
case 4:
return "also wrong";
default:
return "wrong";
case 3:
return "right";
}
`.expectToMatchJsResult();
});
test("switch default case only", () => {
util.testFunction`
let out = 0;
switch (4 as number) {
default:
out = 1
}
return out;
`.expectToMatchJsResult();
});
test("switch fallthrough enters default", () => {
util.testFunction`
const out = [];
switch (3 as number) {
case 3:
out.push("3");
default:
out.push("default");
}
return out;
`.expectToMatchJsResult();
});
test("switch fallthrough does not enter earlier default", () => {
util.testFunction`
const out = [];
switch (3 as number) {
default:
out.push("default");
case 3:
out.push("3");
}
return out;
`.expectToMatchJsResult();
});
test("switch fallthrough stops after default", () => {
util.testFunction`
const out = [];
switch (4 as number) {
default:
out.push("default");
case 3:
out.push("3");
}
return out;
`.expectToMatchJsResult();
});
test.each([0, 1])("switch empty fallthrough to default (%p)", inp => {
util.testFunction`
const out = [];
switch (${inp} as number) {
case 1:
default:
out.push("default");
}
return out;
`
.expectLuaToMatchSnapshot()
.expectToMatchJsResult();
});
test("switch does not pollute parent scope", () => {
util.testFunction`
let x: number = 0;
let y = 1;
switch (x) {
case 0:
let y = 2;
}
return y;
`.expectToMatchJsResult();
});
test.each([0, 1, 2, 3, 4])("switch handles side-effects (%p)", inp => {
util.testFunction`
const out = [];
let y = 0;
function foo() {
return y++;
}
let x = ${inp} as number;
switch (x) {
case foo():
out.push(1);
case foo():
out.push(2);
case foo():
out.push(3);
default:
out.push("default");
case foo():
}
out.push(y);
return out;
`.expectToMatchJsResult();
});
test.each([1, 2])("switch handles side-effects with empty fallthrough (%p)", inp => {
util.testFunction`
const out = [];
let y = 0;
function foo() {
return y++;
}
let x = 0 as number;
switch (x) {
// empty fallthrough 1 or many times
${new Array(inp).fill("case foo():").join("\n")}
default:
out.push("default");
}
out.push(y);
return out;
`.expectToMatchJsResult();
});
test.each([1, 2])("switch handles side-effects with empty fallthrough (preceding clause) (%p)", inp => {
util.testFunction`
const out = [];
let y = 0;
function foo() {
return y++;
}
let x = 0 as number;
switch (x) {
case 1:
out.push(1);
// empty fallthrough 1 or many times
${new Array(inp).fill("case foo():").join("\n")}
default:
out.push("default");
}
out.push(y);
return out;
`.expectToMatchJsResult();
});
test.each([0, 1, 2, 3, 4])("switch handles async side-effects (%p)", inp => {
util.testFunction`
(async () => {
const out = [];
let y = 0;
async function foo() {
return new Promise<number>((resolve) => y++ && resolve(0));
}
let x = ${inp} as number;
switch (x) {
case await foo():
out.push(1);
case await foo():
out.push(2);
case await foo():
out.push(3);
default:
out.push("default");
case await foo():
}
out.push(y);
return out;
})();
`.expectToMatchJsResult();
});
const optimalOutput = (c: number) => util.testFunction`
let x: number = 0;
const out = [];
switch (${c} as number) {
case 0:
case 1:
case 2:
out.push("0,1,2");
break;
default:
x++;
out.push("default = " + x);
case 3: {
out.push("3");
break;
}
case 4:
}
out.push(x.toString());
return out;
`;
test("switch produces optimal output", () => {
optimalOutput(0).expectLuaToMatchSnapshot();
});
test.each([0, 1, 2, 3, 4, 5])("switch produces valid optimal output (%p)", inp => {
optimalOutput(inp).expectToMatchJsResult();
});
describe("switch hoisting", () => {
test("hoisting between cases", () => {
util.testFunction`
let x = 1;
let result = "";
switch (x) {
case 1:
result = hoisted();
break;
case 2:
function hoisted() {
return "hoisted";
}
break;
}
return result;
`.expectToMatchJsResult();
});
test("indirect hoisting between cases", () => {
util.testFunction`
let x = 1;
let result = "";
switch (x) {
case 1:
function callHoisted() {
return hoisted();
}
result = callHoisted();
break;
case 2:
function hoisted() {
return "hoisted";
}
break;
}
return result;
`.expectToMatchJsResult();
});
test("hoisting in case expression", () => {
util.testFunction`
let x = 1;
let result = "";
switch (x) {
case hoisted():
result = "hoisted";
break;
case 2:
function hoisted() {
return 1;
}
break;
}
return result;
`.expectToMatchJsResult();
});
test("hoisting from default clause", () => {
util.testFunction`
let x = 1;
let result = "";
switch (x) {
case 1:
result = hoisted();
break;
default:
function hoisted() {
return "hoisted";
}
break;
}
return result;
`.expectToMatchJsResult();
});
test("hoisting from default clause is not duplicated when falling through", () => {
util.testFunction`
let x = 1;
let result = "";
switch (x) {
case 1:
result = hoisted();
break;
case 2:
result = "2";
default:
function hoisted() {
return "hoisted";
}
result = "default";
case 3:
result = "3";
}
return result;
`
.expectToMatchJsResult()
.expectLuaToMatchSnapshot();
});
test("hoisting from fallthrough clause after default is not duplicated", () => {
util.testFunction`
let x = 1;
let result = "";
switch (x) {
case 1:
result = hoisted();
break;
case 2:
result = "2";
default:
result = "default";
case 3:
function hoisted() {
return "hoisted";
}
result = "3";
}
return result;
`
.expectToMatchJsResult()
.expectLuaToMatchSnapshot();
});
test("hoisting in a solo default clause", () => {
util.testFunction`
let x = 1;
let result = "";
switch (x) {
default:
result = hoisted();
function hoisted() {
return "hoisted";
}
}
return result;
`.expectToMatchJsResult();
});
});
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