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//===- SMLoc.h - Source location for use with diagnostics -------*- C++ -*-===//

//

// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

// See https://llvm.org/LICENSE.txt for license information.

// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

//

//===----------------------------------------------------------------------===//

//

// This file declares the SMLoc class.  This class encapsulates a location in

// source code for use in diagnostics.

//

//===----------------------------------------------------------------------===//

#ifndef LLVM_SUPPORT_SMLOC_H

#define LLVM_SUPPORT_SMLOC_H

#include <cassert>

#include <optional>

namespace llvm {

/// Represents a location in source code.

class SMLoc {

  const char *Ptr = nullptr;

public:

  SMLoc() = default;

  bool isValid() const { return Ptr != nullptr; }

  bool operator==(const SMLoc &RHS) const { return RHS.Ptr == Ptr; }

  bool operator!=(const SMLoc &RHS) const { return RHS.Ptr != Ptr; }

  const char *getPointer() const { return Ptr; }

  static SMLoc getFromPointer(const char *Ptr) {

    SMLoc L;

    L.Ptr = Ptr;

    return L;

  }

};

/// Represents a range in source code.

///

/// SMRange is implemented using a half-open range, as is the convention in C++.

/// In the string "abc", the range [1,3) represents the substring "bc", and the

/// range [2,2) represents an empty range between the characters "b" and "c".

class SMRange {

public:

  SMLoc Start, End;

  SMRange() = default;

  SMRange(std::nullopt_t) {}

  SMRange(SMLoc St, SMLoc En) : Start(St), End(En) {

    assert(Start.isValid() == End.isValid() &&

           "Start and End should either both be valid or both be invalid!");

  }

  bool isValid() const { return Start.isValid(); }

};

} // end namespace llvm

#endif // LLVM_SUPPORT_SMLOC_H