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-rw-r--r--src/string_view.h77
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diff --git a/src/string_view.h b/src/string_view.h
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--- a/src/string_view.h
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@@ -1,77 +0,0 @@
-// Copyright 2019 Roman Perepelitsa.
-//
-// This file is part of GitStatus.
-//
-// GitStatus is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// GitStatus is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
-
-#ifndef ROMKATV_GITSTATUS_STRING_VIEW_H_
-#define ROMKATV_GITSTATUS_STRING_VIEW_H_
-
-#include <algorithm>
-#include <cstddef>
-#include <cstring>
-#include <ostream>
-#include <string>
-
-namespace gitstatus {
-
-// WARNING: StringView must not have embedded null characters. Violations cause UB.
-struct StringView {
- StringView() : StringView("") {}
-
- // Requires: !memchr(s.data(), 0, s.size()).
- //
- // WARNING: The existence of this requirement and the fact that this constructor is implicit
- // means it's dangerous to have std::string instances with embedded null characters anywhere
- // in the program. If you have an std::string `s` with embedded nulls, an innocent-looking
- // `F(s)` might perform an implicit conversion to StringView and land you squarely in the
- // Undefined Behavior land.
- StringView(const std::string& s) : StringView(s.c_str(), s.size()) {}
-
- // Requires: !memchr(ptr, 0, len).
- StringView(const char* ptr, size_t len) : ptr(ptr), len(len) {}
-
- // Requires: end >= begin && !memchr(begin, 0, end - begin).
- StringView(const char* begin, const char* end) : StringView(begin, end - begin) {}
-
- // Requires: strchr(s, 0) == s + N.
- template <size_t N>
- StringView(const char (&s)[N]) : StringView(s, N - 1) {
- static_assert(N, "");
- }
-
- // Explicit because it's the only constructor that isn't O(1).
- // Are you sure you don't already known the strings's length?
- explicit StringView(const char* ptr) : StringView(ptr, ptr ? std::strlen(ptr) : 0) {}
-
- bool StartsWith(StringView prefix) const {
- return len >= prefix.len && !std::memcmp(ptr, prefix.ptr, prefix.len);
- }
-
- bool EndsWith(StringView suffix) const {
- return len >= suffix.len && !std::memcmp(ptr + (len - suffix.len), suffix.ptr, suffix.len);
- }
-
- const char* ptr;
- size_t len;
-};
-
-inline std::ostream& operator<<(std::ostream& strm, StringView s) {
- if (s.ptr) strm.write(s.ptr, s.len);
- return strm;
-}
-
-} // namespace gitstatus
-
-#endif // ROMKATV_GITSTATUS_STRING_VIEW_H_