LLDB  mainline
CommandHistory.cpp
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1 //===-- CommandHistory.cpp --------------------------------------*- 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 #include <inttypes.h>
10 
12 
13 using namespace lldb;
14 using namespace lldb_private;
15 
16 CommandHistory::CommandHistory() : m_mutex(), m_history() {}
17 
19 
20 size_t CommandHistory::GetSize() const {
21  std::lock_guard<std::recursive_mutex> guard(m_mutex);
22  return m_history.size();
23 }
24 
26  std::lock_guard<std::recursive_mutex> guard(m_mutex);
27  return m_history.empty();
28 }
29 
30 llvm::Optional<llvm::StringRef>
31 CommandHistory::FindString(llvm::StringRef input_str) const {
32  std::lock_guard<std::recursive_mutex> guard(m_mutex);
33  if (input_str.size() < 2)
34  return llvm::None;
35 
36  if (input_str[0] != g_repeat_char)
37  return llvm::None;
38 
39  if (input_str[1] == g_repeat_char) {
40  if (m_history.empty())
41  return llvm::None;
42  return llvm::StringRef(m_history.back());
43  }
44 
45  input_str = input_str.drop_front();
46 
47  size_t idx = 0;
48  if (input_str.front() == '-') {
49  if (input_str.drop_front(1).getAsInteger(0, idx))
50  return llvm::None;
51  if (idx >= m_history.size())
52  return llvm::None;
53  idx = m_history.size() - idx;
54  } else {
55  if (input_str.getAsInteger(0, idx))
56  return llvm::None;
57  if (idx >= m_history.size())
58  return llvm::None;
59  }
60 
61  return llvm::StringRef(m_history[idx]);
62 }
63 
64 llvm::StringRef CommandHistory::GetStringAtIndex(size_t idx) const {
65  std::lock_guard<std::recursive_mutex> guard(m_mutex);
66  if (idx < m_history.size())
67  return m_history[idx];
68  return "";
69 }
70 
71 llvm::StringRef CommandHistory::operator[](size_t idx) const {
72  return GetStringAtIndex(idx);
73 }
74 
75 llvm::StringRef CommandHistory::GetRecentmostString() const {
76  std::lock_guard<std::recursive_mutex> guard(m_mutex);
77  if (m_history.empty())
78  return "";
79  return m_history.back();
80 }
81 
82 void CommandHistory::AppendString(llvm::StringRef str, bool reject_if_dupe) {
83  std::lock_guard<std::recursive_mutex> guard(m_mutex);
84  if (reject_if_dupe) {
85  if (!m_history.empty()) {
86  if (str == m_history.back())
87  return;
88  }
89  }
90  m_history.push_back(str);
91 }
92 
94  std::lock_guard<std::recursive_mutex> guard(m_mutex);
95  m_history.clear();
96 }
97 
98 void CommandHistory::Dump(Stream &stream, size_t start_idx,
99  size_t stop_idx) const {
100  std::lock_guard<std::recursive_mutex> guard(m_mutex);
101  stop_idx = std::min(stop_idx + 1, m_history.size());
102  for (size_t counter = start_idx; counter < stop_idx; counter++) {
103  const std::string hist_item = m_history[counter];
104  if (!hist_item.empty()) {
105  stream.Indent();
106  stream.Printf("%4" PRIu64 ": %s\n", (uint64_t)counter, hist_item.c_str());
107  }
108  }
109 }
static const char g_repeat_char
Enumerations for broadcasting.
Definition: SBLaunchInfo.h:14
A stream class that can stream formatted output to a file.
Definition: Stream.h:28
void Dump(Stream &stream, size_t start_idx=0, size_t stop_idx=SIZE_MAX) const
llvm::StringRef GetRecentmostString() const
size_t Printf(const char *format,...) __attribute__((format(printf
Output printf formatted output to the stream.
Definition: Stream.cpp:106
void AppendString(llvm::StringRef str, bool reject_if_dupe=true)
llvm::Optional< llvm::StringRef > FindString(llvm::StringRef input_str) const
Definition: SBAddress.h:15
size_t Indent(const char *s=nullptr)
Indent the current line in the stream.
Definition: Stream.cpp:131
llvm::StringRef GetStringAtIndex(size_t idx) const
llvm::StringRef operator[](size_t idx) const