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135 lines
5.1 KiB
C++
135 lines
5.1 KiB
C++
#pragma once
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#include <cstring>
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#include <iterator>
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#include <memory>
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#include <string>
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#include "esphome/core/defines.h"
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#ifdef USE_JSON
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#include "esphome/components/json/json_util.h"
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#endif // USE_JSON
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namespace esphome {
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/**
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* StringRef is a reference to a string owned by something else. So it behaves like simple string, but it does not own
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* pointer. When it is default constructed, it has empty string. You can freely copy or move around this struct, but
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* never free its pointer. str() function can be used to export the content as std::string. StringRef is adopted from
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* <https://github.com/nghttp2/nghttp2/blob/29cbf8b83ff78faf405d1086b16adc09a8772eca/src/template.h#L376>
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*/
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class StringRef {
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public:
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using traits_type = std::char_traits<char>;
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using value_type = traits_type::char_type;
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using allocator_type = std::allocator<char>;
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using size_type = std::allocator_traits<allocator_type>::size_type;
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using difference_type = std::allocator_traits<allocator_type>::difference_type;
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using const_reference = const value_type &;
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using const_pointer = const value_type *;
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using const_iterator = const_pointer;
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using const_reverse_iterator = std::reverse_iterator<const_iterator>;
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constexpr StringRef() : base_(""), len_(0) {}
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explicit StringRef(const std::string &s) : base_(s.c_str()), len_(s.size()) {}
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explicit StringRef(const char *s) : base_(s), len_(strlen(s)) {}
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constexpr StringRef(const char *s, size_t n) : base_(s), len_(n) {}
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template<typename CharT>
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constexpr StringRef(const CharT *s, size_t n) : base_(reinterpret_cast<const char *>(s)), len_(n) {}
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template<typename InputIt>
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StringRef(InputIt first, InputIt last)
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: base_(reinterpret_cast<const char *>(&*first)), len_(std::distance(first, last)) {}
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template<typename InputIt>
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StringRef(InputIt *first, InputIt *last)
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: base_(reinterpret_cast<const char *>(first)), len_(std::distance(first, last)) {}
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template<typename CharT, size_t N> constexpr static StringRef from_lit(const CharT (&s)[N]) {
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return StringRef{s, N - 1};
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}
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static StringRef from_maybe_nullptr(const char *s) {
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if (s == nullptr) {
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return StringRef();
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}
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return StringRef(s);
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}
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constexpr const_iterator begin() const { return base_; };
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constexpr const_iterator cbegin() const { return base_; };
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constexpr const_iterator end() const { return base_ + len_; };
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constexpr const_iterator cend() const { return base_ + len_; };
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const_reverse_iterator rbegin() const { return const_reverse_iterator{base_ + len_}; }
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const_reverse_iterator crbegin() const { return const_reverse_iterator{base_ + len_}; }
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const_reverse_iterator rend() const { return const_reverse_iterator{base_}; }
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const_reverse_iterator crend() const { return const_reverse_iterator{base_}; }
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constexpr const char *c_str() const { return base_; }
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constexpr size_type size() const { return len_; }
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constexpr bool empty() const { return len_ == 0; }
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constexpr const_reference operator[](size_type pos) const { return *(base_ + pos); }
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std::string str() const { return std::string(base_, len_); }
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const uint8_t *byte() const { return reinterpret_cast<const uint8_t *>(base_); }
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operator std::string() const { return str(); }
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private:
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const char *base_;
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size_type len_;
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};
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inline bool operator==(const StringRef &lhs, const StringRef &rhs) {
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return lhs.size() == rhs.size() && std::equal(std::begin(lhs), std::end(lhs), std::begin(rhs));
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}
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inline bool operator==(const StringRef &lhs, const std::string &rhs) {
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return lhs.size() == rhs.size() && std::equal(std::begin(lhs), std::end(lhs), std::begin(rhs));
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}
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inline bool operator==(const std::string &lhs, const StringRef &rhs) { return rhs == lhs; }
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inline bool operator==(const StringRef &lhs, const char *rhs) {
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return lhs.size() == strlen(rhs) && std::equal(std::begin(lhs), std::end(lhs), rhs);
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}
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inline bool operator==(const char *lhs, const StringRef &rhs) { return rhs == lhs; }
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inline bool operator!=(const StringRef &lhs, const StringRef &rhs) { return !(lhs == rhs); }
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inline bool operator!=(const StringRef &lhs, const std::string &rhs) { return !(lhs == rhs); }
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inline bool operator!=(const std::string &lhs, const StringRef &rhs) { return !(rhs == lhs); }
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inline bool operator!=(const StringRef &lhs, const char *rhs) { return !(lhs == rhs); }
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inline bool operator!=(const char *lhs, const StringRef &rhs) { return !(rhs == lhs); }
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inline bool operator<(const StringRef &lhs, const StringRef &rhs) {
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return std::lexicographical_compare(std::begin(lhs), std::end(lhs), std::begin(rhs), std::end(rhs));
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}
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inline std::string &operator+=(std::string &lhs, const StringRef &rhs) {
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lhs.append(rhs.c_str(), rhs.size());
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return lhs;
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}
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inline std::string operator+(const char *lhs, const StringRef &rhs) {
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auto str = std::string(lhs);
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str.append(rhs.c_str(), rhs.size());
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return str;
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}
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inline std::string operator+(const StringRef &lhs, const char *rhs) {
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auto str = lhs.str();
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str.append(rhs);
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return str;
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}
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#ifdef USE_JSON
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// NOLINTNEXTLINE(readability-identifier-naming)
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void convertToJson(const StringRef &src, JsonVariant dst);
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#endif // USE_JSON
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} // namespace esphome
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