contrib/llvm/tools/lldb/source/Interpreter/CommandHistory.cpp

   1 //===-- CommandHistory.cpp --------------------------------------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include <inttypes.h>
  11
  12 #include "lldb/Interpreter/CommandHistory.h"
  13 #include "lldb/Host/StringConvert.h"
  14
  15 using namespace lldb;
  16 using namespace lldb_private;
  17
  18 CommandHistory::CommandHistory() : m_mutex(), m_history()
  19 {}
  20
  21 CommandHistory::~CommandHistory ()
  22 {}
  23
  24 size_t
  25 CommandHistory::GetSize () const
  26 {
  27     std::lock_guard<std::recursive_mutex> guard(m_mutex);
  28     return m_history.size();
  29 }
  30
  31 bool
  32 CommandHistory::IsEmpty () const
  33 {
  34     std::lock_guard<std::recursive_mutex> guard(m_mutex);
  35     return m_history.empty();
  36 }
  37
  38 const char*
  39 CommandHistory::FindString (const char* input_str) const
  40 {
  41     std::lock_guard<std::recursive_mutex> guard(m_mutex);
  42     if (!input_str)
  43         return nullptr;
  44     if (input_str[0] != g_repeat_char)
  45         return nullptr;
  46     if (input_str[1] == '-')
  47     {
  48         bool success;
  49         size_t idx = StringConvert::ToUInt32 (input_str+2, 0, 0, &success);
  50         if (!success)
  51             return nullptr;
  52         if (idx > m_history.size())
  53             return nullptr;
  54         idx = m_history.size() - idx;
  55         return m_history[idx].c_str();
  56
  57     }
  58     else if (input_str[1] == g_repeat_char)
  59     {
  60         if (m_history.empty())
  61             return nullptr;
  62         else
  63             return m_history.back().c_str();
  64     }
  65     else
  66     {
  67         bool success;
  68         uint32_t idx = StringConvert::ToUInt32 (input_str+1, 0, 0, &success);
  69         if (!success)
  70             return nullptr;
  71         if (idx >= m_history.size())
  72             return nullptr;
  73         return m_history[idx].c_str();
  74     }
  75 }
  76
  77 const char*
  78 CommandHistory::GetStringAtIndex (size_t idx) const
  79 {
  80     std::lock_guard<std::recursive_mutex> guard(m_mutex);
  81     if (idx < m_history.size())
  82         return m_history[idx].c_str();
  83     return nullptr;
  84 }
  85
  86 const char*
  87 CommandHistory::operator [] (size_t idx) const
  88 {
  89     return GetStringAtIndex(idx);
  90 }
  91
  92 const char*
  93 CommandHistory::GetRecentmostString () const
  94 {
  95     std::lock_guard<std::recursive_mutex> guard(m_mutex);
  96     if (m_history.empty())
  97         return nullptr;
  98     return m_history.back().c_str();
  99 }
 100
 101 void
 102 CommandHistory::AppendString (const std::string& str,
 103                               bool reject_if_dupe)
 104 {
 105     std::lock_guard<std::recursive_mutex> guard(m_mutex);
 106     if (reject_if_dupe)
 107     {
 108         if (!m_history.empty())
 109         {
 110             if (str == m_history.back())
 111                 return;
 112         }
 113     }
 114     m_history.push_back(std::string(str));
 115 }
 116
 117 void
 118 CommandHistory::Clear ()
 119 {
 120     std::lock_guard<std::recursive_mutex> guard(m_mutex);
 121     m_history.clear();
 122 }
 123
 124 void
 125 CommandHistory::Dump (Stream& stream,
 126                       size_t start_idx,
 127                       size_t stop_idx) const
 128 {
 129     std::lock_guard<std::recursive_mutex> guard(m_mutex);
 130     stop_idx = std::min(stop_idx + 1, m_history.size());
 131     for (size_t counter = start_idx;
 132          counter < stop_idx;
 133          counter++)
 134     {
 135         const std::string hist_item = m_history[counter];
 136         if (!hist_item.empty())
 137         {
 138             stream.Indent();
 139             stream.Printf("%4" PRIu64 ": %s\n", (uint64_t)counter, hist_item.c_str());
 140         }
 141     }
 142 }