Generate prettier loops.

frog/tests/leg/src/LoopTest.dart

+// Copyright (c) 2012, 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.
+
+#import("compiler_helper.dart");
+
+final String TEST_ONE = @"""
+foo(a) {
+  int x = 0;
+  for (int i = 0; i < 10; i++) {
+    x += i;
+  }
+  return x;
+}
+""";
+
+final String TEST_TWO = @"""
+foo(a) {
+  int x = 0;
+  int i = 0;
+  while (i < 10) {
+    x += i;
+    i++;
+  }
+  return x;
+}
+""";
+
+final String TEST_THREE = @"""
+foo(a) {
+  int x = 0;
+  for (int i in a) {
+    x += i;
+  }
+  return x;
+}
+""";
+
+
+final String TEST_FOUR = @"""
+foo(a) {
+  int x = 0;
+  for (int i = 0; i < 10; i++) {
+    if (i == 5) continue;
+    x += i;
+  }
+  return x;
+}
+""";
+
+final String TEST_FIVE = @"""
+foo(a) {
+  int x = 0;
+  int i = 0;
+  while (i < 10) {
+    i++;
+    if (i == 5) continue;
+    x += i;
+  }
+  return x;
+}
+""";
+
+final String TEST_SIX = @"""
+foo(a) {
+  int x = 0;
+  for (int i in a) {
+    if (i == 5) continue;
+    x += i;
+  }
+  return x;
+}
+""";
+
+
+main() {
+  String generated = compile(TEST_ONE, 'foo');
+  Expect.isTrue(generated.contains(@'for('));
+  generated = compile(TEST_TWO, 'foo');
+  Expect.isTrue(!generated.contains(@'break'));
+  generated = compile(TEST_THREE, 'foo');
+  Expect.isTrue(!generated.contains(@'break'));
+  generated = compile(TEST_FOUR, 'foo');
+  Expect.isTrue(generated.contains(@'continue'));
+  generated = compile(TEST_FIVE, 'foo');
+  Expect.isTrue(generated.contains(@'continue'));
+  generated = compile(TEST_SIX, 'foo');
+  Expect.isTrue(generated.contains(@'continue'));
+}