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