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/*
* Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights
* reserved.
* Copyright (C) Research In Motion Limited 2011. 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.
*
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_TEXT_STRING_OPERATORS_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_TEXT_STRING_OPERATORS_H_
#include "base/numerics/checked_math.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/text/string_concatenate.h"
namespace WTF {
template <typename StringType1, typename StringType2>
class StringAppend final {
STACK_ALLOCATED();
public:
StringAppend(StringType1 string1, StringType2 string2);
operator String() const;
size_t length() const;
bool Is8Bit() const;
void WriteTo(base::span<LChar> destination) const;
void WriteTo(base::span<UChar> destination) const;
private:
const StringType1 string1_;
const StringType2 string2_;
};
template <typename StringType1, typename StringType2>
StringAppend<StringType1, StringType2>::StringAppend(StringType1 string1,
StringType2 string2)
: string1_(string1), string2_(string2) {}
template <typename StringType1, typename StringType2>
StringAppend<StringType1, StringType2>::operator String() const {
const size_t computed_length = length();
if (Is8Bit()) {
base::span<LChar> buffer;
scoped_refptr<StringImpl> result =
StringImpl::CreateUninitialized(computed_length, buffer);
WriteTo(buffer);
return result;
}
base::span<UChar> buffer;
scoped_refptr<StringImpl> result =
StringImpl::CreateUninitialized(computed_length, buffer);
WriteTo(buffer);
return result;
}
template <typename StringType1, typename StringType2>
bool StringAppend<StringType1, StringType2>::Is8Bit() const {
StringTypeAdapter<StringType1> adapter1(string1_);
StringTypeAdapter<StringType2> adapter2(string2_);
return adapter1.Is8Bit() && adapter2.Is8Bit();
}
template <typename StringType1, typename StringType2>
void StringAppend<StringType1, StringType2>::WriteTo(
base::span<LChar> destination) const {
DCHECK(Is8Bit());
StringTypeAdapter<StringType1> adapter1(string1_);
StringTypeAdapter<StringType2> adapter2(string2_);
// Assuming a left-heavy tree of StringAppend<>s, split using the length of
// the right side of the expression.
auto [part1, part2] =
destination.split_at(destination.size() - adapter2.length());
adapter1.WriteTo(part1);
adapter2.WriteTo(part2);
}
template <typename StringType1, typename StringType2>
void StringAppend<StringType1, StringType2>::WriteTo(
base::span<UChar> destination) const {
StringTypeAdapter<StringType1> adapter1(string1_);
StringTypeAdapter<StringType2> adapter2(string2_);
// Assuming a left-heavy tree of StringAppend<>s, split using the length of
// the right side of the expression.
auto [part1, part2] =
destination.split_at(destination.size() - adapter2.length());
adapter1.WriteTo(part1);
adapter2.WriteTo(part2);
}
template <typename StringType1, typename StringType2>
size_t StringAppend<StringType1, StringType2>::length() const {
StringTypeAdapter<StringType1> adapter1(string1_);
base::CheckedNumeric<size_t> total(adapter1.length());
StringTypeAdapter<StringType2> adapter2(string2_);
total += adapter2.length();
return total.ValueOrDie();
}
template <typename StringType1, typename StringType2>
class StringTypeAdapter<StringAppend<StringType1, StringType2>> {
STACK_ALLOCATED();
public:
explicit StringTypeAdapter(
const StringAppend<StringType1, StringType2>& buffer)
: buffer_(buffer) {}
size_t length() const { return buffer_.length(); }
bool Is8Bit() const { return buffer_.Is8Bit(); }
void WriteTo(base::span<LChar> destination) const {
buffer_.WriteTo(destination);
}
void WriteTo(base::span<UChar> destination) const {
buffer_.WriteTo(destination);
}
private:
const StringAppend<StringType1, StringType2>& buffer_;
};
inline StringAppend<const char*, String> operator+(const char* string1,
const String& string2) {
return StringAppend<const char*, String>(string1, string2);
}
inline StringAppend<const char*, AtomicString> operator+(
const char* string1,
const AtomicString& string2) {
return StringAppend<const char*, AtomicString>(string1, string2);
}
inline StringAppend<const char*, StringView> operator+(
const char* string1,
const StringView& string2) {
return StringAppend<const char*, StringView>(string1, string2);
}
inline StringAppend<const UChar*, String> operator+(const UChar* string1,
const String& string2) {
return StringAppend<const UChar*, String>(string1, string2);
}
inline StringAppend<const UChar*, AtomicString> operator+(
const UChar* string1,
const AtomicString& string2) {
return StringAppend<const UChar*, AtomicString>(string1, string2);
}
inline StringAppend<const UChar*, StringView> operator+(
const UChar* string1,
const StringView& string2) {
return StringAppend<const UChar*, StringView>(string1, string2);
}
template <typename T>
StringAppend<String, T> operator+(const String& string1, T string2) {
return StringAppend<String, T>(string1, string2);
}
template <typename T>
StringAppend<AtomicString, T> operator+(const AtomicString& string1,
T string2) {
return StringAppend<AtomicString, T>(string1, string2);
}
template <typename T>
StringAppend<StringView, T> operator+(const StringView& string1, T string2) {
return StringAppend<StringView, T>(string1, string2);
}
template <typename U, typename V, typename W>
StringAppend<StringAppend<U, V>, W> operator+(const StringAppend<U, V>& string1,
W string2) {
return StringAppend<StringAppend<U, V>, W>(string1, string2);
}
} // namespace WTF
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_TEXT_STRING_OPERATORS_H_
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