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/*
* Copyright (C) 2007 David Smith (catfish.man@gmail.com)
* Copyright (C) 2007, 2008, 2011, 2012 Apple Inc. 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "third_party/blink/renderer/core/dom/space_split_string.h"
#include "third_party/blink/renderer/core/html/parser/html_parser_idioms.h"
#include "third_party/blink/renderer/platform/wtf/hash_set.h"
#include "third_party/blink/renderer/platform/wtf/text/atomic_string_hash.h"
#include "third_party/blink/renderer/platform/wtf/text/string_builder.h"
#include "third_party/blink/renderer/platform/wtf/text/string_hash.h"
#include "third_party/blink/renderer/platform/wtf/thread_specific.h"
namespace blink {
// https://dom.spec.whatwg.org/#concept-ordered-set-parser
template <typename CharacterType>
inline void SpaceSplitString::Data::CreateVector(
const AtomicString& source,
const CharacterType* characters,
unsigned length) {
DCHECK_EQ(0u, vector_.size());
HashSet<AtomicString> token_set;
unsigned start = 0;
while (true) {
while (start < length && IsHTMLSpace<CharacterType>(characters[start]))
++start;
if (start >= length)
break;
unsigned end = start + 1;
while (end < length && IsNotHTMLSpace<CharacterType>(characters[end]))
++end;
if (start == 0 && end == length) {
vector_.push_back(source);
return;
}
AtomicString token(characters + start, end - start);
// We skip adding |token| to |token_set| for the first token to reduce the
// cost of HashSet<>::insert(), and adjust |token_set| when the second
// unique token is found.
if (vector_.size() == 0) {
vector_.push_back(token);
} else if (vector_.size() == 1) {
if (vector_[0] != token) {
token_set.insert(vector_[0]);
token_set.insert(token);
vector_.push_back(token);
}
} else if (token_set.insert(token).is_new_entry) {
vector_.push_back(token);
}
start = end + 1;
}
}
void SpaceSplitString::Data::CreateVector(const AtomicString& string) {
unsigned length = string.length();
if (string.Is8Bit()) {
CreateVector(string, string.Characters8(), length);
return;
}
CreateVector(string, string.Characters16(), length);
}
bool SpaceSplitString::Data::ContainsAll(Data& other) {
if (this == &other)
return true;
wtf_size_t this_size = vector_.size();
wtf_size_t other_size = other.vector_.size();
for (wtf_size_t i = 0; i < other_size; ++i) {
const AtomicString& name = other.vector_[i];
wtf_size_t j;
for (j = 0; j < this_size; ++j) {
if (vector_[j] == name)
break;
}
if (j == this_size)
return false;
}
return true;
}
void SpaceSplitString::Data::Add(const AtomicString& string) {
DCHECK(HasOneRef());
DCHECK(!Contains(string));
vector_.push_back(string);
}
void SpaceSplitString::Data::Remove(unsigned index) {
DCHECK(HasOneRef());
vector_.EraseAt(index);
}
void SpaceSplitString::Add(const AtomicString& string) {
if (Contains(string))
return;
EnsureUnique();
if (data_)
data_->Add(string);
else
data_ = Data::Create(string);
}
bool SpaceSplitString::Remove(const AtomicString& string) {
if (!data_)
return false;
unsigned i = 0;
bool changed = false;
while (i < data_->size()) {
if ((*data_)[i] == string) {
if (!changed)
EnsureUnique();
data_->Remove(i);
changed = true;
continue;
}
++i;
}
return changed;
}
void SpaceSplitString::Remove(wtf_size_t index) {
DCHECK_LT(index, size());
EnsureUnique();
data_->Remove(index);
}
void SpaceSplitString::ReplaceAt(wtf_size_t index, const AtomicString& token) {
DCHECK_LT(index, data_->size());
EnsureUnique();
(*data_)[index] = token;
}
AtomicString SpaceSplitString::SerializeToString() const {
wtf_size_t size = this->size();
if (size == 0)
return g_empty_atom;
if (size == 1)
return (*data_)[0];
StringBuilder builder;
builder.Append((*data_)[0]);
for (wtf_size_t i = 1; i < size; ++i) {
builder.Append(' ');
builder.Append((*data_)[i]);
}
return builder.ToAtomicString();
}
SpaceSplitString::DataMap& SpaceSplitString::SharedDataMap() {
DEFINE_THREAD_SAFE_STATIC_LOCAL(ThreadSpecific<DataMap>, map, ());
return *map;
}
void SpaceSplitString::Set(const AtomicString& input_string) {
if (input_string.IsNull()) {
Clear();
return;
}
data_ = Data::Create(input_string);
}
SpaceSplitString::Data::~Data() {
if (!key_string_.IsNull())
SharedDataMap().erase(key_string_);
}
scoped_refptr<SpaceSplitString::Data> SpaceSplitString::Data::Create(
const AtomicString& string) {
Data*& data = SharedDataMap().insert(string, nullptr).stored_value->value;
if (!data) {
data = new Data(string);
return base::AdoptRef(data);
}
return data;
}
scoped_refptr<SpaceSplitString::Data> SpaceSplitString::Data::CreateUnique(
const Data& other) {
return base::AdoptRef(new SpaceSplitString::Data(other));
}
SpaceSplitString::Data::Data(const AtomicString& string) : key_string_(string) {
DCHECK(!string.IsNull());
CreateVector(string);
}
SpaceSplitString::Data::Data(const SpaceSplitString::Data& other)
: RefCounted<Data>(), vector_(other.vector_) {
// Note that we don't copy key_string_ to indicate to the destructor that
// there's nothing to be removed from the SharedDataMap().
}
} // namespace blink
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