StringLexer.h

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//===-- StringLexer.h -------------------------------------------*- 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
//
//===----------------------------------------------------------------------===//
 
#ifndef LLDB_UTILITY_STRINGLEXER_H
#define LLDB_UTILITY_STRINGLEXER_H
 
#include <initializer_list>
#include <string>
#include <utility>
 
namespace lldb_private {
 
class StringLexer {
public:
  typedef std::string::size_type Position;
  typedef std::string::size_type Size;
 
  typedef std::string::value_type Character;
 
  StringLexer(std::string s);
 
  // These APIs are not bounds-checked.  Use HasAtLeast() if you're not sure.
  Character Peek();
 
  bool NextIf(Character c);
 
  std::pair<bool, Character> NextIf(std::initializer_list<Character> cs);
 
  bool AdvanceIf(const std::string &token);
 
  Character Next();
 
  bool HasAtLeast(Size s);
 
  std::string GetUnlexed();
 
  // This will assert if there are less than s characters preceding the cursor.
  void PutBack(Size s);
 
  StringLexer &operator=(const StringLexer &rhs);
 
private:
  std::string m_data;
  Position m_position;
 
  void Consume();
};
 
} // namespace lldb_private
 
#endif // LLDB_UTILITY_STRINGLEXER_H