1 files changed, 143 insertions, 0 deletions
diff --git a/contrib/llvm/tools/lldb/source/Interpreter/CommandHistory.cpp b/contrib/llvm/tools/lldb/source/Interpreter/CommandHistory.cpp
new file mode 100644
index 000000000000..33971e3959c6
--- /dev/null
+++ b/contrib/llvm/tools/lldb/source/Interpreter/CommandHistory.cpp
@@ -0,0 +1,143 @@
+//===-- 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 "lldb/Interpreter/CommandHistory.h"
+#include "lldb/Interpreter/Args.h"
+
+using namespace lldb;
+using namespace lldb_private;
+
+
+CommandHistory::CommandHistory () :
+    m_mutex(Mutex::eMutexTypeRecursive),
+    m_history()
+{}
+
+CommandHistory::~CommandHistory ()
+{}
+
+size_t
+CommandHistory::GetSize () const
+{
+    Mutex::Locker locker(m_mutex);
+    return m_history.size();
+}
+
+bool
+CommandHistory::IsEmpty () const
+{
+    Mutex::Locker locker(m_mutex);
+    return m_history.empty();
+}
+
+const char*
+CommandHistory::FindString (const char* input_str) const
+{
+    Mutex::Locker locker(m_mutex);
+    if (!input_str)
+        return NULL;
+    if (input_str[0] != g_repeat_char)
+        return NULL;
+    if (input_str[1] == '-')
+    {
+        bool success;
+        size_t idx = Args::StringToUInt32 (input_str+2, 0, 0, &success);
+        if (!success)
+            return NULL;
+        if (idx > m_history.size())
+            return NULL;
+        idx = m_history.size() - idx;
+        return m_history[idx].c_str();
+        
+    }
+    else if (input_str[1] == g_repeat_char)
+    {
+        if (m_history.empty())
+            return NULL;
+        else
+            return m_history.back().c_str();
+    }
+    else
+    {
+        bool success;
+        uint32_t idx = Args::StringToUInt32 (input_str+1, 0, 0, &success);
+        if (!success)
+            return NULL;
+        if (idx >= m_history.size())
+            return NULL;
+        return m_history[idx].c_str();
+    }
+}
+
+const char*
+CommandHistory::GetStringAtIndex (size_t idx) const
+{
+    Mutex::Locker locker(m_mutex);
+    if (idx < m_history.size())
+        return m_history[idx].c_str();
+    return NULL;
+}
+
+const char*
+CommandHistory::operator [] (size_t idx) const
+{
+    return GetStringAtIndex(idx);
+}
+
+const char*
+CommandHistory::GetRecentmostString () const
+{
+    Mutex::Locker locker(m_mutex);
+    if (m_history.empty())
+        return NULL;
+    return m_history.back().c_str();
+}
+
+void
+CommandHistory::AppendString (const std::string& str,
+                              bool reject_if_dupe)
+{
+    Mutex::Locker locker(m_mutex);
+    if (reject_if_dupe)
+    {
+        if (!m_history.empty())
+        {
+            if (str == m_history.back())
+                return;
+        }
+    }
+    m_history.push_back(std::string(str));
+}
+
+void
+CommandHistory::Clear ()
+{
+    Mutex::Locker locker(m_mutex);
+    m_history.clear();
+}
+
+void
+CommandHistory::Dump (Stream& stream,
+                      size_t start_idx,
+                      size_t stop_idx) const
+{
+    Mutex::Locker locker(m_mutex);
+    stop_idx = std::min(stop_idx, m_history.size() - 1);
+    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 ("%4zu: %s\n", counter, hist_item.c_str());
+        }
+    }
+}