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//===-- CommandHistory.cpp --------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include <inttypes.h>
#include "lldb/Interpreter/CommandHistory.h"
using namespace lldb;
using namespace lldb_private;
CommandHistory::CommandHistory() : m_mutex(), m_history() {}
CommandHistory::~CommandHistory() {}
size_t CommandHistory::GetSize() const {
std::lock_guard<std::recursive_mutex> guard(m_mutex);
return m_history.size();
}
bool CommandHistory::IsEmpty() const {
std::lock_guard<std::recursive_mutex> guard(m_mutex);
return m_history.empty();
}
llvm::Optional<llvm::StringRef>
CommandHistory::FindString(llvm::StringRef input_str) const {
std::lock_guard<std::recursive_mutex> guard(m_mutex);
if (input_str.size() < 2)
return llvm::None;
if (input_str[0] != g_repeat_char)
return llvm::None;
if (input_str[1] == g_repeat_char) {
if (m_history.empty())
return llvm::None;
return llvm::StringRef(m_history.back());
}
input_str = input_str.drop_front();
size_t idx = 0;
if (input_str.front() == '-') {
if (input_str.drop_front(1).getAsInteger(0, idx))
return llvm::None;
if (idx >= m_history.size())
return llvm::None;
idx = m_history.size() - idx;
} else {
if (input_str.getAsInteger(0, idx))
return llvm::None;
if (idx >= m_history.size())
return llvm::None;
}
return llvm::StringRef(m_history[idx]);
}
llvm::StringRef CommandHistory::GetStringAtIndex(size_t idx) const {
std::lock_guard<std::recursive_mutex> guard(m_mutex);
if (idx < m_history.size())
return m_history[idx];
return "";
}
llvm::StringRef CommandHistory::operator[](size_t idx) const {
return GetStringAtIndex(idx);
}
llvm::StringRef CommandHistory::GetRecentmostString() const {
std::lock_guard<std::recursive_mutex> guard(m_mutex);
if (m_history.empty())
return "";
return m_history.back();
}
void CommandHistory::AppendString(llvm::StringRef str, bool reject_if_dupe) {
std::lock_guard<std::recursive_mutex> guard(m_mutex);
if (reject_if_dupe) {
if (!m_history.empty()) {
if (str == m_history.back())
return;
}
}
m_history.push_back(str);
}
void CommandHistory::Clear() {
std::lock_guard<std::recursive_mutex> guard(m_mutex);
m_history.clear();
}
void CommandHistory::Dump(Stream &stream, size_t start_idx,
size_t stop_idx) const {
std::lock_guard<std::recursive_mutex> guard(m_mutex);
stop_idx = std::min(stop_idx + 1, m_history.size());
for (size_t counter = start_idx; counter < stop_idx; counter++) {
const std::string hist_item = m_history[counter];
if (!hist_item.empty()) {
stream.Indent();
stream.Printf("%4" PRIu64 ": %s\n", (uint64_t)counter, hist_item.c_str());
}
}
}
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