add macOS implementation
This commit is contained in:
Nick Fisher
230
macos/include/utils/CString.h
Normal file
230
macos/include/utils/CString.h
Normal file
@@ -0,0 +1,230 @@
|
||||
/*
|
||||
* Copyright (C) 2015 The Android Open Source Project
|
||||
*
|
||||
* Licensed under the Apache License, Version 2.0 (the "License");
|
||||
* you may not use this file except in compliance with the License.
|
||||
* You may obtain a copy of the License at
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
* See the License for the specific language governing permissions and
|
||||
* limitations under the License.
|
||||
*/
|
||||
|
||||
#ifndef TNT_UTILS_CSTRING_H
|
||||
#define TNT_UTILS_CSTRING_H
|
||||
|
||||
// NOTE: this header should not include STL headers
|
||||
|
||||
#include <utils/compiler.h>
|
||||
|
||||
#include <assert.h>
|
||||
#include <stddef.h>
|
||||
#include <stdint.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
|
||||
namespace utils {
|
||||
|
||||
//! \privatesection
|
||||
struct hashCStrings {
|
||||
typedef const char* argument_type;
|
||||
typedef size_t result_type;
|
||||
result_type operator()(argument_type cstr) const noexcept {
|
||||
size_t hash = 5381;
|
||||
while (int c = *cstr++) {
|
||||
hash = (hash * 33u) ^ size_t(c);
|
||||
}
|
||||
return hash;
|
||||
}
|
||||
};
|
||||
|
||||
template <size_t N>
|
||||
using StringLiteral = const char[N];
|
||||
|
||||
|
||||
// ------------------------------------------------------------------------------------------------
|
||||
|
||||
class UTILS_PUBLIC CString {
|
||||
public:
|
||||
using value_type = char;
|
||||
using size_type = uint32_t;
|
||||
using difference_type = int32_t;
|
||||
using reference = value_type&;
|
||||
using const_reference = const value_type&;
|
||||
using pointer = value_type*;
|
||||
using const_pointer = const value_type*;
|
||||
using iterator = value_type*;
|
||||
using const_iterator = const value_type*;
|
||||
|
||||
CString() noexcept {} // NOLINT(modernize-use-equals-default), Ubuntu compiler bug
|
||||
|
||||
// Allocates memory and appends a null. This constructor can be used to hold arbitrary data
|
||||
// inside the string (i.e. it can contain nulls or non-ASCII encodings).
|
||||
CString(const char* cstr, size_t length);
|
||||
|
||||
// Allocates memory for a string of size length plus space for the null terminating character.
|
||||
// Also initializes the memory to 0. This constructor can be used to hold arbitrary data
|
||||
// inside the string.
|
||||
explicit CString(size_t length);
|
||||
|
||||
// Allocates memory and copies traditional C string content. Unlike the above constructor, this
|
||||
// does not allow embedded nulls. This is explicit because this operation is costly.
|
||||
explicit CString(const char* cstr);
|
||||
|
||||
template<size_t N>
|
||||
CString(StringLiteral<N> const& other) noexcept // NOLINT(google-explicit-constructor)
|
||||
: CString(other, N - 1) {
|
||||
}
|
||||
|
||||
CString(const CString& rhs);
|
||||
|
||||
CString(CString&& rhs) noexcept {
|
||||
this->swap(rhs);
|
||||
}
|
||||
|
||||
|
||||
CString& operator=(const CString& rhs);
|
||||
|
||||
CString& operator=(CString&& rhs) noexcept {
|
||||
this->swap(rhs);
|
||||
return *this;
|
||||
}
|
||||
|
||||
~CString() noexcept {
|
||||
if (mData) {
|
||||
free(mData - 1);
|
||||
}
|
||||
}
|
||||
|
||||
void swap(CString& other) noexcept {
|
||||
// don't use std::swap(), we don't want an STL dependency in this file
|
||||
auto *temp = mCStr;
|
||||
mCStr = other.mCStr;
|
||||
other.mCStr = temp;
|
||||
}
|
||||
|
||||
const_pointer c_str() const noexcept { return mCStr; }
|
||||
pointer c_str() noexcept { return mCStr; }
|
||||
const_pointer c_str_safe() const noexcept { return mData ? c_str() : ""; }
|
||||
const_pointer data() const noexcept { return c_str(); }
|
||||
pointer data() noexcept { return c_str(); }
|
||||
size_type size() const noexcept { return mData ? mData[-1].length : 0; }
|
||||
size_type length() const noexcept { return size(); }
|
||||
bool empty() const noexcept { return size() == 0; }
|
||||
|
||||
iterator begin() noexcept { return mCStr; }
|
||||
iterator end() noexcept { return begin() + length(); }
|
||||
const_iterator begin() const noexcept { return data(); }
|
||||
const_iterator end() const noexcept { return begin() + length(); }
|
||||
const_iterator cbegin() const noexcept { return begin(); }
|
||||
const_iterator cend() const noexcept { return end(); }
|
||||
|
||||
CString& replace(size_type pos, size_type len, const CString& str) noexcept;
|
||||
CString& insert(size_type pos, const CString& str) noexcept { return replace(pos, 0, str); }
|
||||
|
||||
const_reference operator[](size_type pos) const noexcept {
|
||||
assert(pos < size());
|
||||
return begin()[pos];
|
||||
}
|
||||
|
||||
reference operator[](size_type pos) noexcept {
|
||||
assert(pos < size());
|
||||
return begin()[pos];
|
||||
}
|
||||
|
||||
const_reference at(size_type pos) const noexcept {
|
||||
assert(pos < size());
|
||||
return begin()[pos];
|
||||
}
|
||||
|
||||
reference at(size_type pos) noexcept {
|
||||
assert(pos < size());
|
||||
return begin()[pos];
|
||||
}
|
||||
|
||||
reference front() noexcept {
|
||||
assert(size());
|
||||
return begin()[0];
|
||||
}
|
||||
|
||||
const_reference front() const noexcept {
|
||||
assert(size());
|
||||
return begin()[0];
|
||||
}
|
||||
|
||||
reference back() noexcept {
|
||||
assert(size());
|
||||
return begin()[size() - 1];
|
||||
}
|
||||
|
||||
const_reference back() const noexcept {
|
||||
assert(size());
|
||||
return begin()[size() - 1];
|
||||
}
|
||||
|
||||
// placement new declared as "throw" to avoid the compiler's null-check
|
||||
inline void* operator new(size_t, void* ptr) {
|
||||
assert(ptr);
|
||||
return ptr;
|
||||
}
|
||||
|
||||
struct Hasher : private hashCStrings {
|
||||
typedef CString argument_type;
|
||||
typedef size_t result_type;
|
||||
result_type operator()(const argument_type& s) const noexcept {
|
||||
return hashCStrings::operator()(s.c_str());
|
||||
}
|
||||
};
|
||||
|
||||
private:
|
||||
struct Data {
|
||||
size_type length;
|
||||
};
|
||||
|
||||
// mCStr points to the C-string or nullptr. if non-null, mCStr is preceded by the string's size
|
||||
union {
|
||||
value_type *mCStr = nullptr;
|
||||
Data* mData; // Data is stored at mData[-1]
|
||||
};
|
||||
|
||||
int compare(const CString& rhs) const noexcept {
|
||||
size_type lhs_size = size();
|
||||
size_type rhs_size = rhs.size();
|
||||
if (lhs_size < rhs_size) return -1;
|
||||
if (lhs_size > rhs_size) return 1;
|
||||
return strncmp(data(), rhs.data(), size());
|
||||
}
|
||||
|
||||
friend bool operator==(CString const& lhs, CString const& rhs) noexcept {
|
||||
return (lhs.data() == rhs.data()) ||
|
||||
((lhs.size() == rhs.size()) && !strncmp(lhs.data(), rhs.data(), lhs.size()));
|
||||
}
|
||||
friend bool operator!=(CString const& lhs, CString const& rhs) noexcept {
|
||||
return !(lhs == rhs);
|
||||
}
|
||||
friend bool operator<(CString const& lhs, CString const& rhs) noexcept {
|
||||
return lhs.compare(rhs) < 0;
|
||||
}
|
||||
friend bool operator>(CString const& lhs, CString const& rhs) noexcept {
|
||||
return lhs.compare(rhs) > 0;
|
||||
}
|
||||
friend bool operator>=(CString const& lhs, CString const& rhs) noexcept {
|
||||
return !(lhs < rhs);
|
||||
}
|
||||
friend bool operator<=(CString const& lhs, CString const& rhs) noexcept {
|
||||
return !(lhs > rhs);
|
||||
}
|
||||
};
|
||||
|
||||
// implement this for your type for automatic conversion to CString. Failing to do so leads
|
||||
// to a compile-time failure.
|
||||
template<typename T>
|
||||
CString to_string(T value) noexcept;
|
||||
|
||||
} // namespace utils
|
||||
|
||||
#endif // TNT_UTILS_CSTRING_H
|
||||
Reference in New Issue
Block a user