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// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
// Dart test program to test check that we can parse labels.
import "package:expect/expect.dart";
class Helper {
static int ticks = 0;
// Helper function to prevent endless loops in case labels or
// break/continue is broken.
static doAgain() {
++ticks;
if (ticks > 300) {
// obfuscating man's assert(false)
Expect.equals(true, false);
}
return true;
}
static test1() {
var i = 1;
while (doAgain()) {
if (i > 0) break;
return 0;
}
return 111;
}
static test2() {
// Make sure we break out to default label.
var i = 1;
L:
while (doAgain()) {
// unused label
if (i > 0) break;
return 0;
}
return 111;
}
static test3() {
// Make sure we break out of outer loop.
var i = 1;
L:
while (doAgain()) {
while (doAgain()) {
if (i > 0) break L;
return 0;
}
return 1;
}
return 111;
}
static test4() {
// Make sure we break out of inner loop.
var i = 100;
L:
while (doAgain()) {
// unused label
while (doAgain()) {
if (i > 0) break;
return 0;
}
return 111;
}
return 1;
}
static test5() {
// Make sure we jump to loop condition.
var i = 10;
while (i > 0) {
i--;
if (true) continue; // without the if the following return is dead code.
return 0;
}
return 111;
}
static test6() {
// Make sure we jump to loop condition.
L:
for (int i = 10; i > 0; i--) {
// unreferenced label, should warn
if (true) continue; // without the if the following return is dead code.
return 0;
}
// Make sure this L does not conflict with previous L.
var k = 20;
L:
while (doAgain()) {
L0:
while (doAgain()) break L; // unreferenced label L0, should warn
return 1;
}
return 111;
}
static test7() {
// Just weird stuff.
var i = 10;
L:
do {
L:
while (doAgain()) {
if (true) break L; // without the if the following line is dead code.
continue L;
}
i = 0;
continue L;
} while (i == 10 && doAgain());
return 111;
}
static test8() {
L:
while (false) {
var L = 33; // OK, shouldn't collide with label.
if (true) break L;
}
return 111;
}
static test9() {
var i = 111;
L1:
if (i == 0) {
// unreferenced label, should warn
return 0;
}
L2:
while (i == 0) {
// unreferenced label, should warn
return 0;
}
L3: // useless label, should warn
return i;
}
// Labels should be allowed on block/if/for/switch/while/do stmts.
static test10() {
int i = 111;
// block
while (doAgain()) {
L:
{
while (doAgain()) {
break L;
}
i--;
}
break;
}
Expect.equals(111, i);
while (doAgain()) {
L:
if (doAgain()) {
while (doAgain()) {
break L;
}
i--;
}
break;
}
Expect.equals(111, i);
while (doAgain()) {
L:
for (; doAgain();) {
while (doAgain()) {
break L;
}
i--;
}
break;
}
Expect.equals(111, i);
L:
for (i in [111]) {
while (doAgain()) {
break L;
}
i--;
break;
}
Expect.equals(111, i);
L:
for (var j in [111]) {
while (doAgain()) {
break L;
}
i--;
break;
}
Expect.equals(111, i);
while (doAgain()) {
L:
switch (i) {
case 111:
while (doAgain()) {
break L;
}
i--;
break;
default:
i--;
}
break;
}
Expect.equals(111, i);
while (doAgain()) {
L:
do {
while (doAgain()) {
break L;
}
i--;
} while (doAgain());
break;
}
Expect.equals(111, i);
while (doAgain()) {
L:
try {
while (doAgain()) {
break L;
}
i--;
} finally {}
break;
}
Expect.equals(111, i);
return i;
}
static test11() {
// Kind of odd, but is valid and shouldn't be flagged as useless either.
L:
break L;
return 111;
}
static test12() {
int i = 111;
// label the inner block on compound stmts
if (true)
L:
{
while (doAgain()) {
break L;
}
i--;
}
Expect.equals(111, i);
// loop will execute each time, but won't execute code below the break
var forCount = 0;
for (forCount = 0; forCount < 2; forCount++)
L:
{
while (doAgain()) {
break L;
}
i--;
break;
}
Expect.equals(111, i);
Expect.equals(forCount, 2);
for (i in [111])
L:
{
while (doAgain()) {
break L;
}
i--;
break;
}
Expect.equals(111, i);
for (var j in [111])
L:
{
while (doAgain()) {
break L;
}
i--;
break;
}
Expect.equals(111, i);
if (false) {} else
L:
{
while (doAgain()) {
break L;
}
i--;
}
Expect.equals(111, i);
int whileCount = 0;
while (whileCount < 2)
L:
{
whileCount++;
while (doAgain()) {
break L;
}
i--;
break;
}
Expect.equals(111, i);
Expect.equals(2, whileCount);
return i;
}
}
class LabelTest {
static testMain() {
Expect.equals(111, Helper.test1());
Expect.equals(111, Helper.test2());
Expect.equals(111, Helper.test3());
Expect.equals(111, Helper.test4());
Expect.equals(111, Helper.test5());
Expect.equals(111, Helper.test6());
Expect.equals(111, Helper.test7());
Expect.equals(111, Helper.test8());
Expect.equals(111, Helper.test9());
Expect.equals(111, Helper.test10());
Expect.equals(111, Helper.test11());
Expect.equals(111, Helper.test12());
}
}
main() {
LabelTest.testMain();
}