LLDB  mainline
StringLexer.cpp
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1 //===-- StringLexer.cpp ---------------------------------------------------===//
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 
10 
11 #include <algorithm>
12 #include <assert.h>
13 #include <utility>
14 
15 using namespace lldb_private;
16 
17 StringLexer::StringLexer(std::string s) : m_data(std::move(s)), m_position(0) {}
18 
20 
22  auto val = Peek();
23  if (val == c) {
24  Next();
25  return true;
26  }
27  return false;
28 }
29 
30 std::pair<bool, StringLexer::Character>
31 StringLexer::NextIf(std::initializer_list<Character> cs) {
32  auto val = Peek();
33  for (auto c : cs) {
34  if (val == c) {
35  Next();
36  return {true, c};
37  }
38  }
39  return {false, 0};
40 }
41 
42 bool StringLexer::AdvanceIf(const std::string &token) {
43  auto pos = m_position;
44  bool matches = true;
45  for (auto c : token) {
46  if (!NextIf(c)) {
47  matches = false;
48  break;
49  }
50  }
51  if (!matches) {
52  m_position = pos;
53  return false;
54  }
55  return true;
56 }
57 
59  auto val = Peek();
60  Consume();
61  return val;
62 }
63 
65  return (m_data.size() - m_position) >= s;
66 }
67 
69  assert(m_position >= s);
70  m_position -= s;
71 }
72 
74  return std::string(m_data, m_position);
75 }
76 
78 
80  if (this != &rhs) {
81  m_data = rhs.m_data;
82  m_position = rhs.m_position;
83  }
84  return *this;
85 }
lldb_private::StringLexer::Next
Character Next()
Definition: StringLexer.cpp:58
lldb_private::StringLexer::operator=
StringLexer & operator=(const StringLexer &rhs)
Definition: StringLexer.cpp:79
lldb_private::StringLexer::Consume
void Consume()
Definition: StringLexer.cpp:77
lldb_private::StringLexer::PutBack
void PutBack(Size s)
Definition: StringLexer.cpp:68
lldb_private::StringLexer::GetUnlexed
std::string GetUnlexed()
Definition: StringLexer.cpp:73
lldb_private::StringLexer::HasAtLeast
bool HasAtLeast(Size s)
Definition: StringLexer.cpp:64
lldb_private::StringLexer::NextIf
bool NextIf(Character c)
Definition: StringLexer.cpp:21
string
string(SUBSTRING ${p} 10 -1 pStripped) if($
Definition: Plugins/CMakeLists.txt:38
lldb_private::StringLexer::AdvanceIf
bool AdvanceIf(const std::string &token)
Definition: StringLexer.cpp:42
StringLexer.h
lldb_private::StringLexer::m_position
Position m_position
Definition: StringLexer.h:49
lldb_private::StringLexer::Character
std::string::value_type Character
Definition: StringLexer.h:23
lldb_private::StringLexer::StringLexer
StringLexer(std::string s)
Definition: StringLexer.cpp:17
lldb_private
A class that represents a running process on the host machine.
Definition: SBCommandInterpreterRunOptions.h:16
lldb_private::StringLexer::m_data
std::string m_data
Definition: StringLexer.h:48
lldb_private::StringLexer::Size
std::string::size_type Size
Definition: StringLexer.h:21
lldb_private::StringLexer::Peek
Character Peek()
Definition: StringLexer.cpp:19
lldb_private::StringLexer
Definition: StringLexer.h:18