Port and integrate the irregexp engine from V8

tests/language/regex/multiline_test.dart

+// Copyright (c) 2014, 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.
+
+/**
+ * @fileoverview Check that various regexp constructs work as intended.
+ * Particularly those regexps that use ^ and $.
+ */
+
+import 'util.dart';
+import 'package:expect/expect.dart';
+
+void main() {
+  assertTrue(new RegExp(r"^bar").hasMatch("bar"));
+  assertTrue(new RegExp(r"^bar").hasMatch("bar\nfoo"));
+  assertFalse(new RegExp(r"^bar").hasMatch("foo\nbar"));
+  assertTrue(new RegExp(r"^bar", multiLine: true).hasMatch("bar"));
+  assertTrue(new RegExp(r"^bar", multiLine: true).hasMatch("bar\nfoo"));
+  assertTrue(new RegExp(r"^bar", multiLine: true).hasMatch("foo\nbar"));
+
+  assertTrue(new RegExp(r"bar$").hasMatch("bar"));
+  assertFalse(new RegExp(r"bar$").hasMatch("bar\nfoo"));
+  assertTrue(new RegExp(r"bar$").hasMatch("foo\nbar"));
+  assertTrue(new RegExp(r"bar$", multiLine: true).hasMatch("bar"));
+  assertTrue(new RegExp(r"bar$", multiLine: true).hasMatch("bar\nfoo"));
+  assertTrue(new RegExp(r"bar$", multiLine: true).hasMatch("foo\nbar"));
+
+  assertFalse(new RegExp(r"^bxr").hasMatch("bar"));
+  assertFalse(new RegExp(r"^bxr").hasMatch("bar\nfoo"));
+  assertFalse(new RegExp(r"^bxr", multiLine: true).hasMatch("bar"));
+  assertFalse(new RegExp(r"^bxr", multiLine: true).hasMatch("bar\nfoo"));
+  assertFalse(new RegExp(r"^bxr", multiLine: true).hasMatch("foo\nbar"));
+
+  assertFalse(new RegExp(r"bxr$").hasMatch("bar"));
+  assertFalse(new RegExp(r"bxr$").hasMatch("foo\nbar"));
+  assertFalse(new RegExp(r"bxr$", multiLine: true).hasMatch("bar"));
+  assertFalse(new RegExp(r"bxr$", multiLine: true).hasMatch("bar\nfoo"));
+  assertFalse(new RegExp(r"bxr$", multiLine: true).hasMatch("foo\nbar"));
+
+
+  assertTrue(new RegExp(r"^.*$").hasMatch(""));
+  assertTrue(new RegExp(r"^.*$").hasMatch("foo"));
+  assertFalse(new RegExp(r"^.*$").hasMatch("\n"));
+  assertTrue(new RegExp(r"^.*$", multiLine: true).hasMatch("\n"));
+
+  assertTrue(new RegExp(r"^[\s]*$").hasMatch(" "));
+  assertTrue(new RegExp(r"^[\s]*$").hasMatch("\n"));
+
+  assertTrue(new RegExp(r"^[^]*$").hasMatch(""));
+  assertTrue(new RegExp(r"^[^]*$").hasMatch("foo"));
+  assertTrue(new RegExp(r"^[^]*$").hasMatch("\n"));
+
+  assertTrue(new RegExp(r"^([()\s]|.)*$").hasMatch("()\n()"));
+  assertTrue(new RegExp(r"^([()\n]|.)*$").hasMatch("()\n()"));
+  assertFalse(new RegExp(r"^([()]|.)*$").hasMatch("()\n()"));
+  assertTrue(new RegExp(r"^([()]|.)*$", multiLine: true).hasMatch("()\n()"));
+  assertTrue(new RegExp(r"^([()]|.)*$", multiLine: true).hasMatch("()\n"));
+  assertTrue(new RegExp(r"^[()]*$", multiLine: true).hasMatch("()\n."));
+
+  assertTrue(new RegExp(r"^[\].]*$").hasMatch("...]..."));
+
+
+  dynamic check_case(lc, uc) {
+    var a = new RegExp("^" + lc + r"$");
+    assertFalse(a.hasMatch(uc));
+    a = new RegExp("^" + lc + r"$", caseSensitive: false);
+    assertTrue(a.hasMatch(uc));
+
+    var A = new RegExp("^" + uc + r"$");
+    assertFalse(A.hasMatch(lc));
+    A = new RegExp("^" + uc + r"$", caseSensitive: false);
+    assertTrue(A.hasMatch(lc));
+
+    a = new RegExp("^[" + lc + r"]$");
+    assertFalse(a.hasMatch(uc));
+    a = new RegExp("^[" + lc + r"]$", caseSensitive: false);
+    assertTrue(a.hasMatch(uc));
+
+    A = new RegExp("^[" + uc + r"]$");
+    assertFalse(A.hasMatch(lc));
+    A = new RegExp("^[" + uc + r"]$", caseSensitive: false);
+    assertTrue(A.hasMatch(lc));
+  }
+
+
+  check_case("a", "A");
+  // Aring
+  check_case(new String.fromCharCode(229), new String.fromCharCode(197));
+  // Russian G
+  check_case(new String.fromCharCode(0x413), new String.fromCharCode(0x433));
+
+
+  assertThrows(() => new RegExp('[z-a]'));
+}