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// Copyright 2016 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.
#include "third_party/blink/renderer/platform/wtf/text/string_view.h"
#include "third_party/blink/renderer/platform/wtf/text/atomic_string.h"
#include "third_party/blink/renderer/platform/wtf/text/string_impl.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
namespace WTF {
StringView::StringView(const UChar* chars)
: StringView(chars, chars ? LengthOfNullTerminatedString(chars) : 0) {}
#if DCHECK_IS_ON()
StringView::~StringView() {
DCHECK(impl_);
DCHECK(!impl_->HasOneRef() || impl_->IsStatic())
<< "StringView does not own the StringImpl, it "
"must not have the last ref.";
}
#endif
String StringView::ToString() const {
if (IsNull())
return String();
if (IsEmpty())
return g_empty_string;
if (StringImpl* impl = SharedImpl())
return impl;
if (Is8Bit())
return String(Characters8(), length_);
return StringImpl::Create8BitIfPossible(Characters16(), length_);
}
AtomicString StringView::ToAtomicString() const {
if (IsNull())
return g_null_atom;
if (IsEmpty())
return g_empty_atom;
if (StringImpl* impl = SharedImpl())
return AtomicString(impl);
if (Is8Bit())
return AtomicString(Characters8(), length_);
return AtomicString(Characters16(), length_);
}
bool EqualStringView(const StringView& a, const StringView& b) {
if (a.IsNull() || b.IsNull())
return a.IsNull() == b.IsNull();
if (a.length() != b.length())
return false;
if (a.Is8Bit()) {
if (b.Is8Bit())
return Equal(a.Characters8(), b.Characters8(), a.length());
return Equal(a.Characters8(), b.Characters16(), a.length());
}
if (b.Is8Bit())
return Equal(a.Characters16(), b.Characters8(), a.length());
return Equal(a.Characters16(), b.Characters16(), a.length());
}
bool DeprecatedEqualIgnoringCaseAndNullity(const StringView& a,
const StringView& b) {
if (a.length() != b.length())
return false;
if (a.Is8Bit()) {
if (b.Is8Bit()) {
return DeprecatedEqualIgnoringCase(a.Characters8(), b.Characters8(),
a.length());
}
return DeprecatedEqualIgnoringCase(a.Characters8(), b.Characters16(),
a.length());
}
if (b.Is8Bit()) {
return DeprecatedEqualIgnoringCase(a.Characters16(), b.Characters8(),
a.length());
}
return DeprecatedEqualIgnoringCase(a.Characters16(), b.Characters16(),
a.length());
}
bool DeprecatedEqualIgnoringCase(const StringView& a, const StringView& b) {
if (a.IsNull() || b.IsNull())
return a.IsNull() == b.IsNull();
return DeprecatedEqualIgnoringCaseAndNullity(a, b);
}
bool EqualIgnoringASCIICase(const StringView& a, const StringView& b) {
if (a.IsNull() || b.IsNull())
return a.IsNull() == b.IsNull();
if (a.length() != b.length())
return false;
if (a.Is8Bit()) {
if (b.Is8Bit())
return EqualIgnoringASCIICase(a.Characters8(), b.Characters8(),
a.length());
return EqualIgnoringASCIICase(a.Characters8(), b.Characters16(),
a.length());
}
if (b.Is8Bit())
return EqualIgnoringASCIICase(a.Characters16(), b.Characters8(),
a.length());
return EqualIgnoringASCIICase(a.Characters16(), b.Characters16(), a.length());
}
} // namespace WTF
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