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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
127 lines
3.3 KiB
C++
127 lines
3.3 KiB
C++
//===--- StringView.h -------------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// FIXME: Use std::string_view instead when we support C++17.
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//
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//===----------------------------------------------------------------------===//
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#ifndef DEMANGLE_STRINGVIEW_H
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#define DEMANGLE_STRINGVIEW_H
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#include "DemangleConfig.h"
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#include <algorithm>
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#include <cassert>
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#include <cstring>
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DEMANGLE_NAMESPACE_BEGIN
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class StringView {
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const char *First;
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const char *Last;
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public:
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static const size_t npos = ~size_t(0);
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template <size_t N>
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StringView(const char (&Str)[N]) : First(Str), Last(Str + N - 1) {}
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StringView(const char *First_, const char *Last_)
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: First(First_), Last(Last_) {}
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StringView(const char *First_, size_t Len)
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: First(First_), Last(First_ + Len) {}
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StringView(const char *Str) : First(Str), Last(Str + std::strlen(Str)) {}
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StringView() : First(nullptr), Last(nullptr) {}
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StringView substr(size_t From) const {
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return StringView(begin() + From, size() - From);
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}
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size_t find(char C, size_t From = 0) const {
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size_t FindBegin = std::min(From, size());
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// Avoid calling memchr with nullptr.
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if (FindBegin < size()) {
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// Just forward to memchr, which is faster than a hand-rolled loop.
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if (const void *P = ::memchr(First + FindBegin, C, size() - FindBegin))
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return size_t(static_cast<const char *>(P) - First);
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}
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return npos;
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}
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StringView substr(size_t From, size_t To) const {
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if (To >= size())
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To = size() - 1;
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if (From >= size())
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From = size() - 1;
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return StringView(First + From, First + To);
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}
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StringView dropFront(size_t N = 1) const {
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if (N >= size())
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N = size();
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return StringView(First + N, Last);
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}
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StringView dropBack(size_t N = 1) const {
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if (N >= size())
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N = size();
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return StringView(First, Last - N);
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}
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char front() const {
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assert(!empty());
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return *begin();
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}
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char back() const {
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assert(!empty());
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return *(end() - 1);
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}
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char popFront() {
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assert(!empty());
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return *First++;
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}
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bool consumeFront(char C) {
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if (!startsWith(C))
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return false;
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*this = dropFront(1);
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return true;
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}
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bool consumeFront(StringView S) {
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if (!startsWith(S))
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return false;
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*this = dropFront(S.size());
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return true;
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}
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bool startsWith(char C) const { return !empty() && *begin() == C; }
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bool startsWith(StringView Str) const {
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if (Str.size() > size())
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return false;
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return std::equal(Str.begin(), Str.end(), begin());
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}
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const char &operator[](size_t Idx) const { return *(begin() + Idx); }
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const char *begin() const { return First; }
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const char *end() const { return Last; }
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size_t size() const { return static_cast<size_t>(Last - First); }
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bool empty() const { return First == Last; }
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};
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inline bool operator==(const StringView &LHS, const StringView &RHS) {
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return LHS.size() == RHS.size() &&
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std::equal(LHS.begin(), LHS.end(), RHS.begin());
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}
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DEMANGLE_NAMESPACE_END
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#endif
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