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https://github.com/jart/cosmopolitan.git
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9a5a13854d
* Add ctl utility.h Implements forward, move, swap, and declval. This commit also adds a def for nullptr_t to cxx.inc. We need it now because the CTL headers stopped including anything from libc++, so we no longer get their basic types. * Use ctl::swap in string The STL spec says that swap is located in the string_view header anyawy. Performance-wise this is a noop, but it’s slightly cleaner.
354 lines
7.7 KiB
C++
354 lines
7.7 KiB
C++
// -*-mode:c++;indent-tabs-mode:nil;c-basic-offset:4;tab-width:8;coding:utf-8-*-
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// vi: set et ft=cpp ts=4 sts=4 sw=4 fenc=utf-8 :vi
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#ifndef COSMOPOLITAN_CTL_STRING_H_
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#define COSMOPOLITAN_CTL_STRING_H_
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#include "string_view.h"
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namespace ctl {
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class string;
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string strcat(string_view, string_view) noexcept __wur;
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namespace __ {
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constexpr size_t string_size = 3 * sizeof(size_t);
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constexpr size_t sso_max = string_size - 1;
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constexpr size_t big_mask = ~(1ull << (8ull * sizeof(size_t) - 1ull));
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struct small_string
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{
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char buf[sso_max];
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// interpretation is: size == sso_max - rem
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unsigned char rem;
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#if 0
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size_t rem : 7;
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size_t big : 1 /* = 0 */;
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#endif
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};
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struct big_string
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{
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char* p;
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size_t n;
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// interpretation is: capacity == c & big_mask
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size_t c;
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#if 0
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size_t c : sizeof(size_t) * 8 - 1;
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size_t big : 1 /* = 1 */;
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#endif
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};
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} // namespace __
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class string
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{
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public:
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using iterator = char*;
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using const_iterator = const char*;
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static constexpr size_t npos = -1;
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~string() /* noexcept */;
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string(string_view) noexcept;
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string(const char*) noexcept;
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string(const string&) noexcept;
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string(const char*, size_t) noexcept;
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explicit string(size_t, char = 0) noexcept;
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string& operator=(string) noexcept;
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const char* c_str() const noexcept;
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void pop_back() noexcept;
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void grow(size_t) noexcept;
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void reserve(size_t) noexcept;
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void resize(size_t, char = 0) noexcept;
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void append(char) noexcept;
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void append(char, size_t) noexcept;
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void append(unsigned long) noexcept;
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void append(const void*, size_t) noexcept;
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string& insert(size_t, string_view) noexcept;
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string& erase(size_t = 0, size_t = npos) noexcept;
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string substr(size_t = 0, size_t = npos) const noexcept;
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string& replace(size_t, size_t, string_view) noexcept;
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bool operator==(string_view) const noexcept;
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bool operator!=(string_view) const noexcept;
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bool contains(string_view) const noexcept;
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bool ends_with(string_view) const noexcept;
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bool starts_with(string_view) const noexcept;
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size_t find(char, size_t = 0) const noexcept;
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size_t find(string_view, size_t = 0) const noexcept;
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string() noexcept
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{
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__builtin_memset(blob, 0, sizeof(size_t) * 2);
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// equivalent to set_small_size(0) but also zeroes memory
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*(((size_t*)blob) + 2) = __::sso_max << (sizeof(size_t) - 1) * 8;
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}
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void swap(string& s) noexcept
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{
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ctl::swap(blob, s.blob);
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}
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string(string&& s) noexcept
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{
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__builtin_memcpy(blob, s.blob, __::string_size);
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s.set_small_size(0);
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}
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void clear() noexcept
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{
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if (isbig()) {
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big()->n = 0;
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} else {
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set_small_size(0);
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}
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}
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bool empty() const noexcept
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{
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return isbig() ? !big()->n : small()->rem >= __::sso_max;
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}
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inline char* data() noexcept
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{
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return isbig() ? big()->p : small()->buf;
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}
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inline const char* data() const noexcept
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{
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return isbig() ? big()->p : small()->buf;
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}
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inline size_t size() const noexcept
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{
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#if 0
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if (!isbig() && small()->rem > __::sso_max)
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__builtin_trap();
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#endif
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return isbig() ? big()->n : __::sso_max - small()->rem;
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}
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size_t length() const noexcept
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{
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return size();
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}
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size_t capacity() const noexcept
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{
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#if 0
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if (isbig() && big()->c <= __::sso_max)
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__builtin_trap();
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#endif
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return isbig() ? __::big_mask & big()->c : __::string_size;
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}
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iterator begin() noexcept
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{
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return data();
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}
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iterator end() noexcept
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{
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return data() + size();
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}
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const_iterator cbegin() const noexcept
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{
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return data();
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}
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const_iterator cend() const noexcept
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{
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return data() + size();
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}
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char& front()
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{
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if (!size())
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__builtin_trap();
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return data()[0];
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}
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const char& front() const
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{
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if (!size())
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__builtin_trap();
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return data()[0];
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}
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char& back()
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{
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if (!size())
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__builtin_trap();
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return data()[size() - 1];
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}
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const char& back() const
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{
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if (!size())
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__builtin_trap();
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return data()[size() - 1];
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}
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char& operator[](size_t i) noexcept
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{
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if (i >= size())
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__builtin_trap();
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return data()[i];
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}
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const char& operator[](const size_t i) const noexcept
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{
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if (i >= size())
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__builtin_trap();
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return data()[i];
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}
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void push_back(const char ch) noexcept
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{
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append(ch);
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}
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void append(const string_view s) noexcept
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{
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append(s.p, s.n);
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}
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inline operator string_view() const noexcept
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{
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return string_view(data(), size());
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}
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string& operator=(const char* s) noexcept
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{
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clear();
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append(s);
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return *this;
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}
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string& operator=(const string_view s) noexcept
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{
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clear();
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append(s);
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return *this;
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}
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string& operator+=(const char x) noexcept
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{
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append(x);
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return *this;
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}
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string& operator+=(const string_view s) noexcept
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{
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append(s);
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return *this;
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}
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string operator+(const string_view s) const noexcept
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{
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return strcat(*this, s);
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}
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int compare(const string_view s) const noexcept
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{
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return strcmp(*this, s);
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}
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bool operator<(const string_view s) const noexcept
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{
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return compare(s) < 0;
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}
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bool operator<=(const string_view s) const noexcept
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{
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return compare(s) <= 0;
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}
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bool operator>(const string_view s) const noexcept
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{
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return compare(s) > 0;
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}
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bool operator>=(const string_view s) const noexcept
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{
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return compare(s) >= 0;
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}
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private:
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inline bool isbig() const noexcept
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{
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return *(blob + __::sso_max) & 0x80;
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}
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inline void set_small_size(const size_t size) noexcept
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{
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if (size > __::sso_max)
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__builtin_trap();
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*(blob + __::sso_max) = (__::sso_max - size);
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}
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inline void set_big_string(char* const p,
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const size_t n,
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const size_t c2) noexcept
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{
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if (c2 > __::big_mask)
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__builtin_trap();
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*(char**)blob = p;
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*(((size_t*)blob) + 1) = n;
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*(((size_t*)blob) + 2) = c2 | ~__::big_mask;
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}
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inline __::small_string* small() noexcept
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{
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if (isbig())
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__builtin_trap();
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return reinterpret_cast<__::small_string*>(blob);
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}
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inline const __::small_string* small() const noexcept
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{
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if (isbig())
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__builtin_trap();
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return reinterpret_cast<const __::small_string*>(blob);
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}
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inline __::big_string* big() noexcept
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{
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if (!isbig())
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__builtin_trap();
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return reinterpret_cast<__::big_string*>(blob);
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}
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inline const __::big_string* big() const noexcept
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{
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if (!isbig())
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__builtin_trap();
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return reinterpret_cast<const __::big_string*>(blob);
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}
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friend string strcat(string_view, string_view);
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alignas(union {
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__::big_string a;
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__::small_string b;
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}) char blob[__::string_size];
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};
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static_assert(sizeof(string) == __::string_size);
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static_assert(sizeof(__::small_string) == __::string_size);
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static_assert(sizeof(__::big_string) == __::string_size);
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} // namespace ctl
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wliteral-suffix"
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inline ctl::string
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operator"" s(const char* s, size_t n)
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{
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return ctl::string(s, n);
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}
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#pragma GCC diagnostic pop
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#endif // COSMOPOLITAN_CTL_STRING_H_
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