1 //===-- CommandHistory.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
9 #include <inttypes.h>
10
11 #include "lldb/Interpreter/CommandHistory.h"
12
13 using namespace lldb;
14 using namespace lldb_private;
15
CommandHistory()16 CommandHistory::CommandHistory() : m_mutex(), m_history() {}
17
~CommandHistory()18 CommandHistory::~CommandHistory() {}
19
GetSize() const20 size_t CommandHistory::GetSize() const {
21 std::lock_guard<std::recursive_mutex> guard(m_mutex);
22 return m_history.size();
23 }
24
IsEmpty() const25 bool CommandHistory::IsEmpty() const {
26 std::lock_guard<std::recursive_mutex> guard(m_mutex);
27 return m_history.empty();
28 }
29
30 llvm::Optional<llvm::StringRef>
FindString(llvm::StringRef input_str) const31 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
GetStringAtIndex(size_t idx) const64 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
operator [](size_t idx) const71 llvm::StringRef CommandHistory::operator[](size_t idx) const {
72 return GetStringAtIndex(idx);
73 }
74
GetRecentmostString() const75 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
AppendString(llvm::StringRef str,bool reject_if_dupe)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(std::string(str));
91 }
92
Clear()93 void CommandHistory::Clear() {
94 std::lock_guard<std::recursive_mutex> guard(m_mutex);
95 m_history.clear();
96 }
97
Dump(Stream & stream,size_t start_idx,size_t stop_idx) const98 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 }
110