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// Copyright 2016 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#ifndef CORE_FXCRT_CFX_STRING_C_TEMPLATE_H_
#define CORE_FXCRT_CFX_STRING_C_TEMPLATE_H_
#include <algorithm>
#include <type_traits>
#include "core/fxcrt/fx_system.h"
// An immutable string with caller-provided storage which must outlive the
// string itself. These are not necessarily nul-terminated, so that substring
// extraction (via the Mid(), Left(), and Right() methods) is copy-free.
template <typename T>
class CFX_StringCTemplate {
public:
using CharType = T;
using UnsignedType = typename std::make_unsigned<CharType>::type;
CFX_StringCTemplate() : m_Ptr(nullptr), m_Length(0) {}
// Deliberately implicit to avoid calling on every string literal.
// NOLINTNEXTLINE(runtime/explicit)
CFX_StringCTemplate(const CharType* ptr)
: m_Ptr(reinterpret_cast<const UnsignedType*>(ptr)),
m_Length(ptr ? FXSYS_len(ptr) : 0) {}
CFX_StringCTemplate(const CharType* ptr, FX_STRSIZE len)
: m_Ptr(reinterpret_cast<const UnsignedType*>(ptr)),
m_Length(len == -1 ? FXSYS_len(ptr) : len) {}
template <typename U = UnsignedType>
CFX_StringCTemplate(
const UnsignedType* ptr,
FX_STRSIZE size,
typename std::enable_if<!std::is_same<U, CharType>::value>::type* = 0)
: m_Ptr(ptr), m_Length(size) {}
// Deliberately implicit to avoid calling on every string literal.
// |ch| must be an lvalue that outlives the the CFX_StringCTemplate.
// NOLINTNEXTLINE(runtime/explicit)
CFX_StringCTemplate(CharType& ch) {
m_Ptr = reinterpret_cast<const UnsignedType*>(&ch);
m_Length = 1;
}
CFX_StringCTemplate(const CFX_StringCTemplate& src) {
m_Ptr = src.m_Ptr;
m_Length = src.m_Length;
}
CFX_StringCTemplate& operator=(const CharType* src) {
m_Ptr = reinterpret_cast<const UnsignedType*>(src);
m_Length = src ? FXSYS_len(src) : 0;
return *this;
}
CFX_StringCTemplate& operator=(const CFX_StringCTemplate& src) {
m_Ptr = src.m_Ptr;
m_Length = src.m_Length;
return *this;
}
bool operator==(const CharType* ptr) const {
return FXSYS_len(ptr) == m_Length &&
FXSYS_cmp(ptr, reinterpret_cast<const CharType*>(m_Ptr), m_Length) ==
0;
}
bool operator==(const CFX_StringCTemplate& other) const {
return other.m_Length == m_Length &&
FXSYS_cmp(reinterpret_cast<const CharType*>(other.m_Ptr),
reinterpret_cast<const CharType*>(m_Ptr), m_Length) == 0;
}
bool operator!=(const CharType* ptr) const { return !(*this == ptr); }
bool operator!=(const CFX_StringCTemplate& other) const {
return !(*this == other);
}
uint32_t GetID(FX_STRSIZE start_pos = 0) const {
if (m_Length == 0 || start_pos < 0 || start_pos >= m_Length)
return 0;
uint32_t strid = 0;
FX_STRSIZE size = std::min(4, m_Length - start_pos);
for (FX_STRSIZE i = 0; i < size; i++)
strid = strid * 256 + m_Ptr[start_pos + i];
return strid << ((4 - size) * 8);
}
const UnsignedType* raw_str() const { return m_Ptr; }
const CharType* c_str() const {
return reinterpret_cast<const CharType*>(m_Ptr);
}
FX_STRSIZE GetLength() const { return m_Length; }
bool IsEmpty() const { return m_Length == 0; }
UnsignedType GetAt(FX_STRSIZE index) const { return m_Ptr[index]; }
CharType CharAt(FX_STRSIZE index) const {
return static_cast<CharType>(m_Ptr[index]);
}
FX_STRSIZE Find(CharType ch) const {
const UnsignedType* found = reinterpret_cast<const UnsignedType*>(
FXSYS_chr(reinterpret_cast<const CharType*>(m_Ptr), ch, m_Length));
return found ? found - m_Ptr : -1;
}
CFX_StringCTemplate Mid(FX_STRSIZE index, FX_STRSIZE count = -1) const {
index = std::max(0, index);
if (index > m_Length)
return CFX_StringCTemplate();
if (count < 0 || count > m_Length - index)
count = m_Length - index;
return CFX_StringCTemplate(m_Ptr + index, count);
}
CFX_StringCTemplate Left(FX_STRSIZE count) const {
if (count <= 0)
return CFX_StringCTemplate();
return CFX_StringCTemplate(m_Ptr, std::min(count, m_Length));
}
CFX_StringCTemplate Right(FX_STRSIZE count) const {
if (count <= 0)
return CFX_StringCTemplate();
count = std::min(count, m_Length);
return CFX_StringCTemplate(m_Ptr + m_Length - count, count);
}
const UnsignedType& operator[](size_t index) const { return m_Ptr[index]; }
bool operator<(const CFX_StringCTemplate& that) const {
int result = FXSYS_cmp(reinterpret_cast<const CharType*>(m_Ptr),
reinterpret_cast<const CharType*>(that.m_Ptr),
std::min(m_Length, that.m_Length));
return result < 0 || (result == 0 && m_Length < that.m_Length);
}
protected:
const UnsignedType* m_Ptr;
FX_STRSIZE m_Length;
private:
void* operator new(size_t) throw() { return nullptr; }
};
template <typename T>
inline bool operator==(const T* lhs, const CFX_StringCTemplate<T>& rhs) {
return rhs == lhs;
}
template <typename T>
inline bool operator!=(const T* lhs, const CFX_StringCTemplate<T>& rhs) {
return rhs != lhs;
}
extern template class CFX_StringCTemplate<FX_CHAR>;
extern template class CFX_StringCTemplate<FX_WCHAR>;
#endif // CORE_FXCRT_CFX_STRING_C_TEMPLATE_H_
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