1 //===--------------------- StringLexer.h ------------------------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #ifndef utility_StringLexer_h_
11 #define utility_StringLexer_h_
12 
13 #include <initializer_list>
14 #include <string>
15 #include <utility>
16 
17 namespace lldb_utility {
18 
19 class StringLexer {
20 public:
21   typedef std::string::size_type Position;
22   typedef std::string::size_type Size;
23 
24   typedef std::string::value_type Character;
25 
26   StringLexer(std::string s);
27 
28   StringLexer(const StringLexer &rhs);
29 
30   // These APIs are not bounds-checked.  Use HasAtLeast() if you're not sure.
31   Character Peek();
32 
33   bool NextIf(Character c);
34 
35   std::pair<bool, Character> NextIf(std::initializer_list<Character> cs);
36 
37   bool AdvanceIf(const std::string &token);
38 
39   Character Next();
40 
41   bool HasAtLeast(Size s);
42 
43   std::string GetUnlexed();
44 
45   // This will assert if there are less than s characters preceding the cursor.
46   void PutBack(Size s);
47 
48   StringLexer &operator=(const StringLexer &rhs);
49 
50 private:
51   std::string m_data;
52   Position m_position;
53 
54   void Consume();
55 };
56 
57 } // namespace lldb_private
58 
59 #endif // #ifndef utility_StringLexer_h_
60