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//===--- StringView.h -------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//
// This file contains a limited version of LLVM's StringView class. It is
// copied here so that LLVMDemangle need not take a dependency on LLVMSupport.
//===----------------------------------------------------------------------===//
#ifndef LLVM_DEMANGLE_STRINGVIEW_H
#define LLVM_DEMANGLE_STRINGVIEW_H
#include <algorithm>
class StringView {
const char *First;
const char *Last;
public:
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() : First(nullptr), Last(nullptr) {}
StringView substr(size_t From, size_t To) {
if (To >= size())
To = size() - 1;
if (From >= size())
From = size() - 1;
return StringView(First + From, First + To);
}
StringView dropFront(size_t N) const {
if (N >= size())
N = size() - 1;
return StringView(First + N, Last);
}
bool startsWith(StringView Str) const {
if (Str.size() > size())
return false;
return std::equal(Str.begin(), Str.end(), begin());
}
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::equal(LHS.begin(), LHS.end(), RHS.begin());
}
#endif
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