[regexp] Add support for dotAll flag

test/mjsunit/harmony/regexp-dotall.js

+// Copyright 2017 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-regexp-dotall
+
+function toSlowMode(re) {
+  re.exec = (str) => RegExp.prototype.exec.call(re, str);
+  return re;
+}
+
+// Construction does not throw.
+{
+  let re = /./s;
+  re = RegExp(".", "s");
+  re = new RegExp(".", "s");
+  assertThrows(() => new RegExp(".", "wtf"), SyntaxError);
+}
+
+// The flags accessors.
+{
+  let re = /./s;
+  assertEquals("s", re.flags);
+  assertFalse(re.global);
+  assertFalse(re.ignoreCase);
+  assertFalse(re.multiline);
+  assertFalse(re.sticky);
+  assertFalse(re.unicode);
+  assertTrue(re.dotAll);
+
+  re = toSlowMode(/./s);
+  assertEquals("s", re.flags);
+  assertFalse(re.global);
+  assertFalse(re.ignoreCase);
+  assertFalse(re.multiline);
+  assertFalse(re.sticky);
+  assertFalse(re.unicode);
+  assertTrue(re.dotAll);
+
+  re = /./gimyus;
+  assertEquals("gimsuy", re.flags);
+  assertTrue(re.global);
+  assertTrue(re.ignoreCase);
+  assertTrue(re.multiline);
+  assertTrue(re.sticky);
+  assertTrue(re.unicode);
+  assertTrue(re.dotAll);
+
+  re = /./gimyu;
+  assertEquals("gimuy", re.flags);
+  assertTrue(re.global);
+  assertTrue(re.ignoreCase);
+  assertTrue(re.multiline);
+  assertTrue(re.sticky);
+  assertTrue(re.unicode);
+  assertFalse(re.dotAll);
+}
+
+// Default '.' behavior.
+{
+  let re = /^.$/;
+  assertTrue(re.test("a"));
+  assertTrue(re.test("3"));
+  assertTrue(re.test("π"));
+  assertTrue(re.test("\u2027"));
+  assertTrue(re.test("\u0085"));
+  assertTrue(re.test("\v"));
+  assertTrue(re.test("\f"));
+  assertFalse(re.test("\u{10300}"));  // Supplementary plane.
+  assertFalse(re.test("\n"));
+  assertFalse(re.test("\r"));
+  assertFalse(re.test("\u2028"));
+  assertFalse(re.test("\u2029"));

[mathias, 2017/03/29 16:10:42]

Let’s test U+180E as well, since it used to be a whitespace character but isn’t
anymore.
(https://github.com/mathiasbynens/regexpu-core/commit/9b10d2a597d4e56b236cae0f...)

[jgruber, 2017/03/30 07:32:39]

Done. The expectation for U+180E is to match '.' in all cases.

+}
+
+// Default '.' behavior (unicode).
+{
+  let re = /^.$/u;
+  assertTrue(re.test("a"));
+  assertTrue(re.test("3"));
+  assertTrue(re.test("π"));
+  assertTrue(re.test("\u2027"));
+  assertTrue(re.test("\u0085"));
+  assertTrue(re.test("\v"));
+  assertTrue(re.test("\f"));
+  assertTrue(re.test("\u{10300}"));  // Supplementary plane.
+  assertFalse(re.test("\n"));
+  assertFalse(re.test("\r"));
+  assertFalse(re.test("\u2028"));
+  assertFalse(re.test("\u2029"));
+  assertTrue(re.test("\u{10300}"));
+}
+
+// DotAll '.' behavior.
+{
+  let re = /^.$/s;
+  assertTrue(re.test("a"));
+  assertTrue(re.test("3"));
+  assertTrue(re.test("π"));
+  assertTrue(re.test("\u2027"));
+  assertTrue(re.test("\u0085"));
+  assertTrue(re.test("\v"));
+  assertTrue(re.test("\f"));
+  assertFalse(re.test("\u{10300}"));  // Supplementary plane.
+  assertTrue(re.test("\n"));
+  assertTrue(re.test("\r"));
+  assertTrue(re.test("\u2028"));
+  assertTrue(re.test("\u2029"));
+}
+
+// DotAll '.' behavior (unicode).
+{
+  let re = /^.$/su;
+  assertTrue(re.test("a"));
+  assertTrue(re.test("3"));
+  assertTrue(re.test("π"));
+  assertTrue(re.test("\u2027"));
+  assertTrue(re.test("\u0085"));
+  assertTrue(re.test("\v"));
+  assertTrue(re.test("\f"));
+  assertTrue(re.test("\u{10300}"));  // Supplementary plane.
+  assertTrue(re.test("\n"));
+  assertTrue(re.test("\r"));
+  assertTrue(re.test("\u2028"));
+  assertTrue(re.test("\u2029"));
+}