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 <cinttypes>
10#include <optional>
11
12#include "lldb/Interpreter/CommandHistory.h"
13
14using namespace lldb;
15using namespace lldb_private;
16
17size_t CommandHistory::GetSize() const {
18 std::lock_guard<std::recursive_mutex> guard(m_mutex);
19 return m_history.size();
20}
21
22bool CommandHistory::IsEmpty() const {
23 std::lock_guard<std::recursive_mutex> guard(m_mutex);
24 return m_history.empty();
25}
26
27std::optional<llvm::StringRef>
28CommandHistory::FindString(llvm::StringRef input_str) const {
29 std::lock_guard<std::recursive_mutex> guard(m_mutex);
30 if (input_str.size() < 2)
31 return std::nullopt;
32
33 if (input_str[0] != g_repeat_char)
34 return std::nullopt;
35
36 if (input_str[1] == g_repeat_char) {
37 if (m_history.empty())
38 return std::nullopt;
39 return llvm::StringRef(m_history.back());
40 }
41
42 input_str = input_str.drop_front();
43
44 size_t idx = 0;
45 if (input_str.front() == '-') {
46 if (input_str.drop_front(N: 1).getAsInteger(Radix: 0, Result&: idx))
47 return std::nullopt;
48 if (idx >= m_history.size())
49 return std::nullopt;
50 idx = m_history.size() - idx;
51 } else {
52 if (input_str.getAsInteger(Radix: 0, Result&: idx))
53 return std::nullopt;
54 if (idx >= m_history.size())
55 return std::nullopt;
56 }
57
58 return llvm::StringRef(m_history[idx]);
59}
60
61llvm::StringRef CommandHistory::GetStringAtIndex(size_t idx) const {
62 std::lock_guard<std::recursive_mutex> guard(m_mutex);
63 if (idx < m_history.size())
64 return m_history[idx];
65 return "";
66}
67
68llvm::StringRef CommandHistory::operator[](size_t idx) const {
69 return GetStringAtIndex(idx);
70}
71
72llvm::StringRef CommandHistory::GetRecentmostString() const {
73 std::lock_guard<std::recursive_mutex> guard(m_mutex);
74 if (m_history.empty())
75 return "";
76 return m_history.back();
77}
78
79void CommandHistory::AppendString(llvm::StringRef str, bool reject_if_dupe) {
80 std::lock_guard<std::recursive_mutex> guard(m_mutex);
81 if (reject_if_dupe) {
82 if (!m_history.empty()) {
83 if (str == m_history.back())
84 return;
85 }
86 }
87 m_history.push_back(x: std::string(str));
88}
89
90void CommandHistory::Clear() {
91 std::lock_guard<std::recursive_mutex> guard(m_mutex);
92 m_history.clear();
93}
94
95void CommandHistory::Dump(Stream &stream, size_t start_idx,
96 size_t stop_idx) const {
97 std::lock_guard<std::recursive_mutex> guard(m_mutex);
98 stop_idx = std::min(a: stop_idx + 1, b: m_history.size());
99 for (size_t counter = start_idx; counter < stop_idx; counter++) {
100 const std::string hist_item = m_history[counter];
101 if (!hist_item.empty()) {
102 stream.Indent();
103 stream.Printf(format: "%4" PRIu64 ": %s\n", (uint64_t)counter, hist_item.c_str());
104 }
105 }
106}
107

source code of lldb/source/Interpreter/CommandHistory.cpp