--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/OrthancFramework/Sources/Lua/LuaFunctionCall.cpp	Wed Jun 10 20:30:34 2020 +0200
@@ -0,0 +1,191 @@
+/**
+ * Orthanc - A Lightweight, RESTful DICOM Store
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017-2020 Osimis S.A., Belgium
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * In addition, as a special exception, the copyright holders of this
+ * program give permission to link the code of its release with the
+ * OpenSSL project's "OpenSSL" library (or with modified versions of it
+ * that use the same license as the "OpenSSL" library), and distribute
+ * the linked executables. You must obey the GNU General Public License
+ * in all respects for all of the code used other than "OpenSSL". If you
+ * modify file(s) with this exception, you may extend this exception to
+ * your version of the file(s), but you are not obligated to do so. If
+ * you do not wish to do so, delete this exception statement from your
+ * version. If you delete this exception statement from all source files
+ * in the program, then also delete it here.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+
+#include "../PrecompiledHeaders.h"
+#include "LuaFunctionCall.h"
+
+#include "../OrthancException.h"
+#include "../Logging.h"
+
+#include <cassert>
+#include <stdio.h>
+#include <boost/lexical_cast.hpp>
+
+namespace Orthanc
+{
+  void LuaFunctionCall::CheckAlreadyExecuted()
+  {
+    if (isExecuted_)
+    {
+      throw OrthancException(ErrorCode_LuaAlreadyExecuted);
+    }
+  }
+
+  LuaFunctionCall::LuaFunctionCall(LuaContext& context,
+                                   const char* functionName) : 
+    context_(context),
+    isExecuted_(false)
+  {
+    // Clear the stack to fulfill the invariant
+    lua_settop(context_.lua_, 0);
+    lua_getglobal(context_.lua_, functionName);
+  }
+
+  void LuaFunctionCall::PushString(const std::string& value)
+  {
+    CheckAlreadyExecuted();
+    lua_pushlstring(context_.lua_, value.c_str(), value.size());
+  }
+
+  void LuaFunctionCall::PushBoolean(bool value)
+  {
+    CheckAlreadyExecuted();
+    lua_pushboolean(context_.lua_, value);
+  }
+
+  void LuaFunctionCall::PushInteger(int value)
+  {
+    CheckAlreadyExecuted();
+    lua_pushinteger(context_.lua_, value);
+  }
+
+  void LuaFunctionCall::PushDouble(double value)
+  {
+    CheckAlreadyExecuted();
+    lua_pushnumber(context_.lua_, value);
+  }
+
+  void LuaFunctionCall::PushJson(const Json::Value& value)
+  {
+    CheckAlreadyExecuted();
+    context_.PushJson(value);
+  }
+
+  void LuaFunctionCall::ExecuteInternal(int numOutputs)
+  {
+    CheckAlreadyExecuted();
+
+    assert(lua_gettop(context_.lua_) >= 1);
+    int nargs = lua_gettop(context_.lua_) - 1;
+    int error = lua_pcall(context_.lua_, nargs, numOutputs, 0);
+
+    if (error) 
+    {
+      assert(lua_gettop(context_.lua_) >= 1);
+          
+      std::string description(lua_tostring(context_.lua_, -1));
+      lua_pop(context_.lua_, 1); /* pop error message from the stack */
+
+      throw OrthancException(ErrorCode_CannotExecuteLua, description);
+    }
+
+    if (lua_gettop(context_.lua_) < numOutputs)
+    {
+      throw OrthancException(ErrorCode_LuaBadOutput);
+    }
+
+    isExecuted_ = true;
+  }
+
+  bool LuaFunctionCall::ExecutePredicate()
+  {
+    ExecuteInternal(1);
+    
+    if (!lua_isboolean(context_.lua_, 1))
+    {
+      throw OrthancException(ErrorCode_NotLuaPredicate);
+    }
+
+    return lua_toboolean(context_.lua_, 1) != 0;
+  }
+
+
+  void LuaFunctionCall::ExecuteToJson(Json::Value& result,
+                                      bool keepStrings)
+  {
+    ExecuteInternal(1);
+    context_.GetJson(result, context_.lua_, lua_gettop(context_.lua_), keepStrings);
+  }
+
+
+  void LuaFunctionCall::ExecuteToString(std::string& result)
+  {
+    ExecuteInternal(1);
+    
+    int top = lua_gettop(context_.lua_);
+    if (lua_isstring(context_.lua_, top))
+    {
+      result = lua_tostring(context_.lua_, top);
+    }
+    else
+    {
+      throw OrthancException(ErrorCode_LuaReturnsNoString);
+    }
+  }
+
+
+  void LuaFunctionCall::PushStringMap(const std::map<std::string, std::string>& value)
+  {
+    Json::Value json = Json::objectValue;
+
+    for (std::map<std::string, std::string>::const_iterator
+           it = value.begin(); it != value.end(); ++it)
+    {
+      json[it->first] = it->second;
+    }
+
+    PushJson(json);
+  }
+
+
+  void LuaFunctionCall::PushDicom(const DicomMap& dicom)
+  {
+    DicomArray a(dicom);
+    PushDicom(a);
+  }
+
+
+  void LuaFunctionCall::PushDicom(const DicomArray& dicom)
+  {
+    Json::Value value = Json::objectValue;
+
+    for (size_t i = 0; i < dicom.GetSize(); i++)
+    {
+      const DicomValue& v = dicom.GetElement(i).GetValue();
+      std::string s = (v.IsNull() || v.IsBinary()) ? "" : v.GetContent();
+      value[dicom.GetElement(i).GetTag().Format()] = s;
+    }
+
+    PushJson(value);
+  }
+}