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Unified Diff: third_party/WebKit/Source/wtf/text/StringHash.h

Issue 2764243002: Move files in wtf/ to platform/wtf/ (Part 9). (Closed)
Patch Set: Rebase. Created 3 years, 9 months ago
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Index: third_party/WebKit/Source/wtf/text/StringHash.h
diff --git a/third_party/WebKit/Source/wtf/text/StringHash.h b/third_party/WebKit/Source/wtf/text/StringHash.h
index 905ede3690a417ea6f7c276470ed95fd780e2860..62be72b00017ce4384c032deb102ff4460c52635 100644
--- a/third_party/WebKit/Source/wtf/text/StringHash.h
+++ b/third_party/WebKit/Source/wtf/text/StringHash.h
@@ -1,163 +1,9 @@
-/*
- * Copyright (C) 2006, 2007, 2008, 2012, 2013 Apple Inc. All rights reserved
- * Copyright (C) Research In Motion Limited 2009. All rights reserved.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public License
- * along with this library; see the file COPYING.LIB. If not, write to
- * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- *
- */
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
-#ifndef StringHash_h
-#define StringHash_h
+#include "platform/wtf/text/StringHash.h"
-#include "wtf/Allocator.h"
-#include "wtf/HashTraits.h"
-#include "wtf/StringHasher.h"
-#include "wtf/text/AtomicString.h"
-
-namespace WTF {
-
-inline bool HashTraits<String>::isEmptyValue(const String& value) {
- return value.isNull();
-}
-
-// The hash() functions on StringHash and CaseFoldingHash do not support null
-// strings. get(), contains(), and add() on HashMap<String,..., StringHash>
-// cause a null-pointer dereference when passed null strings.
-
-// FIXME: We should really figure out a way to put the computeHash function
-// that's currently a member function of StringImpl into this file so we can be
-// a little closer to having all the nearly-identical hash functions in one
-// place.
-
-struct StringHash {
- STATIC_ONLY(StringHash);
- static unsigned hash(StringImpl* key) { return key->hash(); }
- static inline bool equal(const StringImpl* a, const StringImpl* b) {
- return equalNonNull(a, b);
- }
-
- static unsigned hash(const RefPtr<StringImpl>& key) { return key->hash(); }
- static bool equal(const RefPtr<StringImpl>& a, const RefPtr<StringImpl>& b) {
- return equal(a.get(), b.get());
- }
-
- static unsigned hash(const String& key) { return key.impl()->hash(); }
- static bool equal(const String& a, const String& b) {
- return equal(a.impl(), b.impl());
- }
-
- static const bool safeToCompareToEmptyOrDeleted = false;
-};
-
-class CaseFoldingHash {
- STATIC_ONLY(CaseFoldingHash);
-
- public:
- static unsigned hash(const UChar* data, unsigned length) {
- return StringHasher::computeHashAndMaskTop8Bits<UChar, foldCase<UChar>>(
- data, length);
- }
-
- static unsigned hash(StringImpl* str) {
- if (str->is8Bit())
- return hash(str->characters8(), str->length());
- return hash(str->characters16(), str->length());
- }
-
- static unsigned hash(const LChar* data, unsigned length) {
- return StringHasher::computeHashAndMaskTop8Bits<LChar, foldCase<LChar>>(
- data, length);
- }
-
- static inline unsigned hash(const char* data, unsigned length) {
- return CaseFoldingHash::hash(reinterpret_cast<const LChar*>(data), length);
- }
-
- static inline unsigned hash(const char* data) {
- return CaseFoldingHash::hash(reinterpret_cast<const LChar*>(data),
- strlen(data));
- }
-
- static inline bool equal(const StringImpl* a, const StringImpl* b) {
- DCHECK(a);
- DCHECK(b);
- // Save one branch inside each StringView by derefing the StringImpl,
- // and another branch inside the compare function by skipping the null
- // checks.
- return equalIgnoringCaseAndNullity(*a, *b);
- }
-
- static unsigned hash(const RefPtr<StringImpl>& key) {
- return hash(key.get());
- }
-
- static bool equal(const RefPtr<StringImpl>& a, const RefPtr<StringImpl>& b) {
- return equal(a.get(), b.get());
- }
-
- static unsigned hash(const String& key) { return hash(key.impl()); }
- static unsigned hash(const AtomicString& key) { return hash(key.impl()); }
- static bool equal(const String& a, const String& b) {
- return equal(a.impl(), b.impl());
- }
- static bool equal(const AtomicString& a, const AtomicString& b) {
- return (a == b) || equal(a.impl(), b.impl());
- }
-
- static const bool safeToCompareToEmptyOrDeleted = false;
-
- private:
- // Private so no one uses this in the belief that it will return the
- // correctly-folded code point in all cases (see comment below).
- template <typename T>
- static inline UChar foldCase(T ch) {
- if (std::is_same<T, LChar>::value)
- return StringImpl::latin1CaseFoldTable[ch];
- // It's possible for WTF::Unicode::foldCase() to return a 32-bit value
- // that's not representable as a UChar. However, since this is rare and
- // deterministic, and the result of this is merely used for hashing, go
- // ahead and clamp the value.
- return static_cast<UChar>(WTF::Unicode::foldCase(ch));
- }
-};
-
-// This hash can be used in cases where the key is a hash of a string, but we
-// don't want to store the string. It's not really specific to string hashing,
-// but all our current uses of it are for strings.
-struct AlreadyHashed : IntHash<unsigned> {
- STATIC_ONLY(AlreadyHashed);
- static unsigned hash(unsigned key) { return key; }
-
- // To use a hash value as a key for a hash table, we need to eliminate the
- // "deleted" value, which is negative one. That could be done by changing
- // the string hash function to never generate negative one, but this works
- // and is still relatively efficient.
- static unsigned avoidDeletedValue(unsigned hash) {
- DCHECK(hash);
- unsigned newHash = hash | (!(hash + 1) << 31);
- DCHECK(newHash);
- DCHECK_NE(newHash, 0xFFFFFFFF);
- return newHash;
- }
-};
-
-} // namespace WTF
-
-using WTF::AlreadyHashed;
-using WTF::CaseFoldingHash;
-using WTF::StringHash;
-
-#endif
+// The contents of this header was moved to platform/wtf as part of
+// WTF migration project. See the following post for details:
+// https://groups.google.com/a/chromium.org/d/msg/blink-dev/tLdAZCTlcAA/bYXVT8gYCAAJ
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