Cleanup string
kaetemi
4 years ago
parent
c9f967b52b
commit
0d2633b697
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// NeL - MMORPG Framework <https://wiki.ryzom.dev/>
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// Copyright (C) 2020 Jan BOON (Kaetemi) <jan.boon@kaetemi.be>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as
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// published by the Free Software Foundation, either version 3 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#ifndef NLMISC_STRING_VIEW_H
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#define NLMISC_STRING_VIEW_H
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#include <nel/misc/types_nl.h>
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#include <string>
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#ifdef NL_CPP14
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using namespace std::string_literals;
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#ifdef NL_CPP17
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#include <string_view>
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using namespace std::string_view_literals;
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#endif
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#endif
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#ifdef NL_CPP14
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/// Obtain an std::string from a string literal.
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#define nlstr(strLit) (strLit##s)
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#else
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/// Obtain an std::string from a string literal.
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#define nlstr(strLit) (std::string(strLit))
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#endif
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#ifdef NL_CPP17
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/// Obtain a string view from a string literal.
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#define nlsv(strLit) (strLit##sv)
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/// Obtain an std::string from a string view.
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#define nlsvs(strView) (std::string(strView))
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#else
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/// Obtain a string view from a string literal.
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#define nlsv(strLit) (CStringView(strLit, ::strlen(strLit)))
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/// Obtain an std::string from a string view.
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#define nlsvs(strView) (std::string(strView.data(), strView.size()))
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#endif
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/// Obtain a temporary C-string from a string view. Use directly in argument, do not store.
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#define nlsvc(strView) ((strView.data()[strView.size()]) ? nlsvs(strView).c_str() : strView.data())
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namespace NLMISC {
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/// String view literals allow bypassing allocation and strlen calls.
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/// CStringView is a 100% drop-in replacement for (const char *str, size_t len) tuples. It's a non-owning reference.
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/// Always use `CStringView` where previously `const std::string &` would have been used. It avoids accidental copy.
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/// Gotcha: CStringView doesn't need to end with \0, so there's no guarantee with functions that expect \0 terminated strings,
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/// use the `nlsvc` macro to get a temporary C-string from a CStringView.
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/// Use the `nlsv` macro to get a CStringView from a string literal.
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/// Use the `nlstr` macro to get an std::string from a string literal.
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/// Use the `nlsvs` macro to get an std::string from a CStringView.
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#ifdef NL_CPP17
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typedef std::string_view CStringView;
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#else
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class CStringView
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{
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public:
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CStringView(const std::string &str) : m_Str(&str[0]), m_Len(str.size()) {}
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CStringView(const char *const str, const size_t len) : m_Str(str), m_Len(len) {}
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CStringView(const char *const str) : m_Str(str), m_Len(sizeof(str)) {}
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inline const char *data() const { return m_Str; }
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inline size_t length() const { return m_Len; }
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inline size_t size() const { return m_Len; }
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inline CStringView substr(const size_t offset, const size_t count = -1) { return CStringView(m_Str + offset, std::min(m_Len - offset, count)); }
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inline bool operator==(const CStringView o) { if (m_Len != o.m_Len) return false; return memcmp(m_Str, o.m_Str, m_Len) == 0; }
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inline bool operator!=(const CStringView o) { if (m_Len != o.m_Len) return true; return memcmp(m_Str, o.m_Str, m_Len) != 0; }
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struct const_iterator
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{
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public:
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const_iterator() : m_Addr(NULL) { }
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inline void operator++()
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{
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++m_Addr;
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}
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inline void operator+=(ptrdiff_t v)
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{
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m_Addr += v;
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}
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inline void operator--()
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{
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--m_Addr;
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}
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inline void operator-=(ptrdiff_t v)
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{
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m_Addr -= v;
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}
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inline bool operator!=(const const_iterator &o) const { return m_Addr != o.m_Addr; }
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inline bool operator==(const const_iterator &o) const { return m_Addr == o.m_Addr; }
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inline const char &operator*() const { return *m_Addr; }
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private:
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friend class CStringView;
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inline const_iterator(const char *addr) : m_Addr(addr) {}
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const char *m_Addr;
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};
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typedef const_iterator iterator;
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iterator begin() const { return iterator(m_Str); }
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inline iterator end() const { return iterator(m_Str + m_Len); }
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private:
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const char *m_Str;
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size_t m_Len;
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};
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#endif
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}
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#endif /* #ifndef NLMISC_STRING_VIEW_H */
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/* end of file */
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@ -0,0 +1,31 @@
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// NeL - MMORPG Framework <https://wiki.ryzom.dev/>
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// Copyright (C) 2020 Jan BOON (Kaetemi) <jan.boon@kaetemi.be>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as
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// published by the Free Software Foundation, either version 3 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#include "stdmisc.h"
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#include "nel/misc/string_view.h"
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// STL includes
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// Project includes
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namespace NLMISC
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{
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void nothing_here_string_view_nl() { }
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} /* namespace NLMISC */
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/* end of file */
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