mirror of
https://github.com/yuzu-emu/yuzu.git
synced 2024-11-16 20:30:04 +00:00
124 lines
3.4 KiB
C++
124 lines
3.4 KiB
C++
//===--- StringView.h ----------------*- mode:c++;eval:(read-only-mode) -*-===//
|
|
// Do not edit! See README.txt.
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-FileCopyrightText: Part of the LLVM Project
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// FIXME: Use std::string_view instead when we support C++17.
|
|
// There are two copies of this file in the source tree. The one under
|
|
// libcxxabi is the original and the one under llvm is the copy. Use
|
|
// cp-to-llvm.sh to update the copy. See README.txt for more details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef DEMANGLE_STRINGVIEW_H
|
|
#define DEMANGLE_STRINGVIEW_H
|
|
|
|
#include "DemangleConfig.h"
|
|
#include <cassert>
|
|
#include <cstring>
|
|
|
|
DEMANGLE_NAMESPACE_BEGIN
|
|
|
|
class StringView {
|
|
const char *First;
|
|
const char *Last;
|
|
|
|
public:
|
|
static const size_t npos = ~size_t(0);
|
|
|
|
template <size_t N>
|
|
StringView(const char (&Str)[N]) : First(Str), Last(Str + N - 1) {}
|
|
StringView(const char *First_, const char *Last_)
|
|
: First(First_), Last(Last_) {}
|
|
StringView(const char *First_, size_t Len)
|
|
: First(First_), Last(First_ + Len) {}
|
|
StringView(const char *Str) : First(Str), Last(Str + std::strlen(Str)) {}
|
|
StringView() : First(nullptr), Last(nullptr) {}
|
|
|
|
StringView substr(size_t Pos, size_t Len = npos) const {
|
|
assert(Pos <= size());
|
|
if (Len > size() - Pos)
|
|
Len = size() - Pos;
|
|
return StringView(begin() + Pos, Len);
|
|
}
|
|
|
|
size_t find(char C, size_t From = 0) const {
|
|
// Avoid calling memchr with nullptr.
|
|
if (From < size()) {
|
|
// Just forward to memchr, which is faster than a hand-rolled loop.
|
|
if (const void *P = ::memchr(First + From, C, size() - From))
|
|
return size_t(static_cast<const char *>(P) - First);
|
|
}
|
|
return npos;
|
|
}
|
|
|
|
StringView dropFront(size_t N = 1) const {
|
|
if (N >= size())
|
|
N = size();
|
|
return StringView(First + N, Last);
|
|
}
|
|
|
|
StringView dropBack(size_t N = 1) const {
|
|
if (N >= size())
|
|
N = size();
|
|
return StringView(First, Last - N);
|
|
}
|
|
|
|
char front() const {
|
|
assert(!empty());
|
|
return *begin();
|
|
}
|
|
|
|
char back() const {
|
|
assert(!empty());
|
|
return *(end() - 1);
|
|
}
|
|
|
|
char popFront() {
|
|
assert(!empty());
|
|
return *First++;
|
|
}
|
|
|
|
bool consumeFront(char C) {
|
|
if (!startsWith(C))
|
|
return false;
|
|
*this = dropFront(1);
|
|
return true;
|
|
}
|
|
|
|
bool consumeFront(StringView S) {
|
|
if (!startsWith(S))
|
|
return false;
|
|
*this = dropFront(S.size());
|
|
return true;
|
|
}
|
|
|
|
bool startsWith(char C) const { return !empty() && *begin() == C; }
|
|
|
|
bool startsWith(StringView Str) const {
|
|
if (Str.size() > size())
|
|
return false;
|
|
return std::strncmp(Str.begin(), begin(), Str.size()) == 0;
|
|
}
|
|
|
|
const char &operator[](size_t Idx) const { return *(begin() + Idx); }
|
|
|
|
const char *begin() const { return First; }
|
|
const char *end() const { return Last; }
|
|
size_t size() const { return static_cast<size_t>(Last - First); }
|
|
bool empty() const { return First == Last; }
|
|
};
|
|
|
|
inline bool operator==(const StringView &LHS, const StringView &RHS) {
|
|
return LHS.size() == RHS.size() &&
|
|
std::strncmp(LHS.begin(), RHS.begin(), LHS.size()) == 0;
|
|
}
|
|
|
|
DEMANGLE_NAMESPACE_END
|
|
|
|
#endif
|