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1 //===-- StringLexer.h -------------------------------------------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #ifndef LLDB_UTILITY_STRINGLEXER_H
10 #define LLDB_UTILITY_STRINGLEXER_H
11 
12 #include <initializer_list>
13 #include <string>
14 #include <utility>
15 
16 namespace lldb_private {
17 
18 class StringLexer {
19 public:
20   typedef std::string::size_type Position;
21   typedef std::string::size_type Size;
22 
23   typedef std::string::value_type Character;
24 
25   StringLexer(std::string s);
26 
27   // These APIs are not bounds-checked.  Use HasAtLeast() if you're not sure.
28   Character Peek();
29 
30   bool NextIf(Character c);
31 
32   std::pair<bool, Character> NextIf(std::initializer_list<Character> cs);
33 
34   bool AdvanceIf(const std::string &token);
35 
36   Character Next();
37 
38   bool HasAtLeast(Size s);
39 
40   std::string GetUnlexed();
41 
42   // This will assert if there are less than s characters preceding the cursor.
43   void PutBack(Size s);
44 
45   StringLexer &operator=(const StringLexer &rhs);
46 
47 private:
48   std::string m_data;
49   Position m_position;
50 
51   void Consume();
52 };
53 
54 } // namespace lldb_private
55 
56 #endif // LLDB_UTILITY_STRINGLEXER_H
57