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152 lines
4.3 KiB
C++
152 lines
4.3 KiB
C++
// Copyright 2019 Roman Perepelitsa.
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//
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// This file is part of GitStatus.
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//
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// GitStatus is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// GitStatus 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 General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
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#ifndef ROMKATV_GITSTATUS_STRING_CMP_H_
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#define ROMKATV_GITSTATUS_STRING_CMP_H_
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#include <string.h> // because there is no std::strcasecmp in C++
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#include <algorithm>
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#include <cctype>
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#include <cstddef>
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#include <cstring>
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#include "string_view.h"
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namespace gitstatus {
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// WARNING: These routines assume no embedded null characters in StringView. Violations cause UB.
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template <int kCaseSensitive = -1>
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struct StrCmp;
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template <>
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struct StrCmp<0> {
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int operator()(StringView x, StringView y) const {
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size_t n = std::min(x.len, y.len);
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int cmp = strncasecmp(x.ptr, y.ptr, n);
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if (cmp) return cmp;
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return static_cast<ssize_t>(x.len) - static_cast<ssize_t>(y.len);
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}
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int operator()(StringView x, const char* y) const {
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for (const char *p = x.ptr, *e = p + x.len; p != e; ++p, ++y) {
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if (int cmp = std::tolower(*p) - std::tolower(*y)) return cmp;
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}
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return 0 - *y;
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}
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int operator()(char x, char y) const { return std::tolower(x) - std::tolower(y); }
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int operator()(const char* x, const char* y) const { return strcasecmp(x, y); }
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int operator()(const char* x, StringView y) const { return -operator()(y, x); }
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};
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template <>
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struct StrCmp<1> {
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int operator()(StringView x, StringView y) const {
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size_t n = std::min(x.len, y.len);
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int cmp = std::memcmp(x.ptr, y.ptr, n);
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if (cmp) return cmp;
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return static_cast<ssize_t>(x.len) - static_cast<ssize_t>(y.len);
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}
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int operator()(StringView x, const char* y) const {
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for (const char *p = x.ptr, *e = p + x.len; p != e; ++p, ++y) {
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if (int cmp = *p - *y) return cmp;
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}
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return 0 - *y;
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}
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int operator()(char x, char y) const { return x - y; }
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int operator()(const char* x, const char* y) const { return std::strcmp(x, y); }
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int operator()(const char* x, StringView y) const { return -operator()(y, x); }
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};
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template <>
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struct StrCmp<-1> {
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explicit StrCmp(bool case_sensitive) : case_sensitive(case_sensitive) {}
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template <class X, class Y>
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int operator()(const X& x, const Y& y) const {
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return case_sensitive ? StrCmp<1>()(x, y) : StrCmp<0>()(x, y);
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}
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bool case_sensitive;
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};
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template <int kCaseSensitive = -1>
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struct StrLt : private StrCmp<kCaseSensitive> {
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using StrCmp<kCaseSensitive>::StrCmp;
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template <class X, class Y>
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bool operator()(const X& x, const Y& y) const {
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return StrCmp<kCaseSensitive>::operator()(x, y) < 0;
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}
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};
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template <int kCaseSensitive = -1>
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struct StrEq : private StrCmp<kCaseSensitive> {
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using StrCmp<kCaseSensitive>::StrCmp;
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template <class X, class Y>
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bool operator()(const X& x, const Y& y) const {
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return StrCmp<kCaseSensitive>::operator()(x, y) == 0;
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}
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bool operator()(const StringView& x, const StringView& y) const {
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return x.len == y.len && StrCmp<kCaseSensitive>::operator()(x, y) == 0;
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}
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};
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template <int kCaseSensitive = -1>
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struct Str {
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static_assert(kCaseSensitive == 0 || kCaseSensitive == 1, "");
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static const bool case_sensitive = kCaseSensitive;
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StrCmp<kCaseSensitive> Cmp;
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StrLt<kCaseSensitive> Lt;
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StrEq<kCaseSensitive> Eq;
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};
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template <int kCaseSensitive>
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const bool Str<kCaseSensitive>::case_sensitive;
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template <>
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struct Str<-1> {
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explicit Str(bool case_sensitive)
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: case_sensitive(case_sensitive),
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Cmp(case_sensitive),
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Lt(case_sensitive),
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Eq(case_sensitive) {}
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bool case_sensitive;
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StrCmp<-1> Cmp;
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StrLt<-1> Lt;
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StrEq<-1> Eq;
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};
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template <class Iter>
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void StrSort(Iter begin, Iter end, bool case_sensitive) {
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case_sensitive ? std::sort(begin, end, StrLt<true>()) : std::sort(begin, end, StrLt<false>());
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}
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} // namespace gitstatus
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#endif // ROMKATV_GITSTATUS_STRING_CMP_H_
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