Big merge from experimental to bleeding edge.

tests/corelib/string_slice_test.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.
+
+// Short string.
+var s = "0123456789";
+// Long string.
+var l = "$s$s$s$s$s$s$s$s$s$s";
+// Very long string.
+var v = "$l$l$l$l$l$l$l$l$l$l";
+
+
+testSliceSuccess() {
+  // Test different ways to get the same slice from a string.
+  testSlice(String string, int start, int end) {
+    int length = string.length;
+    String expect = string.substring(start, end);
+    Expect.equals(expect, string.slice(start, end), "#${length}[$start:$end]");
+    if (start < length) {
+      // If start == length, there is no negative representation of the position.
+      Expect.equals(expect, string.slice(start - length, end),
+                    "#${length}[${start - length}:$end]");
+    }
+    if (end < length) {
+      Expect.equals(expect, string.slice(start, end - length),
+                    "#${length}[$start:${end - length}]");
+      Expect.equals(expect, string.slice(start - length, end - length),
+                    "#${length}[${start-length}:${end-length}]");
+    } else {
+      Expect.equals(expect, string.slice(start),
+                    "#${length}[$start]");
+      if (start < length) {
+        Expect.equals(expect, string.slice(start - length),
+                      "#${length}[${start-length}]");
+        if (start == 0) {
+          Expect.equals(string, string.slice(), "#$length[:]");
+        }
+      }
+    }
+  }
+
+  testSliceCombinations(String string) {
+    int length = string.length;
+    List<int> positions = [0, 1, string.length >> 1, length - 1, length];
+    for (int i = 0; i < positions.length; i++) {
+      for (int j = i; j < positions.length; j++) {
+        testSlice(string, positions[i], positions[j]);
+      }
+    }
+  }
+
+  testSliceCombinations(s);
+  testSliceCombinations(l);
+  testSliceCombinations(v);
+}
+
+testSliceError() {
+  function expectRangeError(void thunk()) {
+    Expect.throws(thunk, (e) => e is RangeError);
+  };
+  function expectArgumentError(void thunk()) {
+    Expect.throws(thunk, (e) => e is ArgumentError);
+  };
+  function badType(void thunk()) {
+    bool checkedMode = false;
+    assert(checkedMode = true);
+    Expect.throws(thunk,
+                  (e) => checkedMode ? e is TypeError : e is ArgumentError);
+  }
+
+  // Invalid start:
+  expectRangeError(() => s.slice(11));
+  expectRangeError(() => s.slice(-11));
+  // Invalid end:
+  expectRangeError(() => s.slice(0, 11));
+  expectRangeError(() => s.slice(0, -11));
+  // Non-int:
+  badType(() => s.slice(1.5));
+  badType(() => s.slice(0, 1.5));
+  badType(() => s.slice("1"));
+  badType(() => s.slice(0, "1"));
+  // Bad order:
+  expectArgumentError(() => s.slice(5, 4));
+  expectArgumentError(() => s.slice(-5, 4));
+  expectArgumentError(() => s.slice(5, -6));
+  expectArgumentError(() => s.slice(-5, -6));
+}
+
+
+main() {
+  testSliceSuccess();
+  testSliceError();
+}