Mercurial > hg > orthanc
view Core/Lua/LuaFunctionCall.cpp @ 790:331eaf9d9d69
ParsedDicomFile
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Mon, 05 May 2014 18:55:10 +0200 |
parents | 2d0a347e8cfc |
children | a811bdf8b8eb |
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/** * Orthanc - A Lightweight, RESTful DICOM Store * Copyright (C) 2012-2014 Medical Physics Department, CHU of Liege, * 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 "LuaFunctionCall.h" namespace Orthanc { void LuaFunctionCall::CheckAlreadyExecuted() { if (isExecuted_) { throw LuaException("Arguments cannot be pushed after the function is executed"); } } LuaFunctionCall::LuaFunctionCall(LuaContext& context, const char* functionName) : context_(context), lock_(context.mutex_), 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_pushstring(context_.lua_, value.c_str()); } 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(); if (value.isString()) { lua_pushstring(context_.lua_, value.asCString()); } else if (value.isDouble()) { lua_pushnumber(context_.lua_, value.asDouble()); } else if (value.isInt()) { lua_pushinteger(context_.lua_, value.asInt()); } else if (value.isUInt()) { lua_pushinteger(context_.lua_, value.asUInt()); } else if (value.isBool()) { lua_pushboolean(context_.lua_, value.asBool()); } else if (value.isNull()) { lua_pushnil(context_.lua_); } else if (value.isArray()) { lua_newtable(context_.lua_); // http://lua-users.org/wiki/SimpleLuaApiExample for (Json::Value::ArrayIndex i = 0; i < value.size(); i++) { // Push the table index (note the "+1" because of Lua conventions) lua_pushnumber(context_.lua_, i + 1); // Push the value of the cell PushJSON(value[i]); // Stores the pair in the table lua_rawset(context_.lua_, -3); } } else if (value.isObject()) { lua_newtable(context_.lua_); Json::Value::Members members = value.getMemberNames(); for (Json::Value::Members::const_iterator it = members.begin(); it != members.end(); ++it) { // Push the index of the cell lua_pushstring(context_.lua_, it->c_str()); // Push the value of the cell PushJSON(value[*it]); // Stores the pair in the table lua_rawset(context_.lua_, -3); } } else { throw LuaException("Unsupported JSON conversion"); } } void LuaFunctionCall::Execute(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 LuaException(description); } if (lua_gettop(context_.lua_) < numOutputs) { throw LuaException("The function does not give the expected number of outputs"); } isExecuted_ = true; } bool LuaFunctionCall::ExecutePredicate() { Execute(1); if (lua_gettop(context_.lua_) == 0) { throw LuaException("No output was provided by the function"); } if (!lua_isboolean(context_.lua_, 1)) { throw LuaException("The function is not a predicate (only true/false outputs allowed)"); } return lua_toboolean(context_.lua_, 1) != 0; } }