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diff --git a/js/src/irregexp/RegExpCharacters.h b/js/src/irregexp/RegExpCharacters.h
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+++ b/js/src/irregexp/RegExpCharacters.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99: */
+
+// Copyright 2012 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef V8_JSREGEXPCHARACTERS_H_
+#define V8_JSREGEXPCHARACTERS_H_
+
+namespace js {
+
+namespace irregexp {
+
+char16_t
+ConvertNonLatin1ToLatin1(char16_t c, bool unicode);
+
+// -------------------------------------------------------------------
+// CharacterRange
+
+// The ranges have inclusive from and exclusive to.
+
+// This covers \s as defined in ES2016, 21.2.2.12 CharacterClassEscape,
+// which includes WhiteSpace (11.2) and LineTerminator (11.3) values.
+extern const int kSpaceRanges[];
+extern const int kSpaceRangeCount;
+
+// Characters in \s and additionally all surrogate characters.
+extern const int kSpaceAndSurrogateRanges[];
+extern const int kSpaceAndSurrogateRangeCount;
+
+// This covers \w as defined in ES2016, 21.2.2.12 CharacterClassEscape.
+extern const int kWordRanges[];
+extern const int kWordRangeCount;
+
+// Characters which case-fold to characters in \w.
+extern const int kIgnoreCaseWordRanges[];
+extern const int kIgnoreCaseWordRangeCount;
+
+// Characters in \w and additionally all surrogate characters.
+extern const int kWordAndSurrogateRanges[];
+extern const int kWordAndSurrogateRangeCount;
+
+// All characters excluding those which case-fold to \w and excluding all
+// surrogate characters.
+extern const int kNegatedIgnoreCaseWordAndSurrogateRanges[];
+extern const int kNegatedIgnoreCaseWordAndSurrogateRangeCount;
+
+// This covers \d as defined in ES2016, 21.2.2.12 CharacterClassEscape.
+extern const int kDigitRanges[];
+extern const int kDigitRangeCount;
+
+// Characters in \d and additionally all surrogate characters.
+extern const int kDigitAndSurrogateRanges[];
+extern const int kDigitAndSurrogateRangeCount;
+
+// The range of all surrogate characters.
+extern const int kSurrogateRanges[];
+extern const int kSurrogateRangeCount;
+
+// Line terminators as defined in ES2016, 11.3 LineTerminator.
+extern const int kLineTerminatorRanges[];
+extern const int kLineTerminatorRangeCount;
+
+} } // namespace js::irregexp
+
+#endif // V8_JSREGEXPCHARACTERS_H_