1 files changed, 79 insertions, 0 deletions
diff --git a/Sluift/Lua/LuaUtils.cpp b/Sluift/Lua/LuaUtils.cpp
new file mode 100644
index 0000000..7052abe
--- /dev/null
+++ b/Sluift/Lua/LuaUtils.cpp
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2013 Remko Tronçon
+ * Licensed under the GNU General Public License.
+ * See the COPYING file for more information.
+ */
+
+#include <Sluift/Lua/LuaUtils.h>
+
+#include <lua.hpp>
+
+#include <boost/scope_exit.hpp>
+#include <Sluift/Lua/Exception.h>
+#include <iostream>
+#include <cassert>
+#include <sstream>
+#include <boost/numeric/conversion/cast.hpp>
+#include <Sluift/globals.h>
+
+using namespace Swift::Lua;
+
+static const std::string INDENT = "  ";
+
+void Swift::Lua::registerTableToString(lua_State* L, int index) {
+	index = Lua::absoluteOffset(L, index);
+	lua_rawgeti(L, LUA_REGISTRYINDEX, Sluift::globals.bootIndex);
+	lua_getfield(L, -1, "register_table_tostring");
+	lua_pushvalue(L, index);
+	if (lua_pcall(L, 1, 0, 0) != 0) {
+		throw Lua::Exception(lua_tostring(L, -1));
+	}
+	lua_pop(L, 1);
+}
+
+void Swift::Lua::registerGetByTypeIndex(lua_State* L, int index) {
+	index = Lua::absoluteOffset(L, index);
+	lua_rawgeti(L, LUA_REGISTRYINDEX, Sluift::globals.bootIndex);
+	lua_getfield(L, -1, "register_get_by_type_index");
+	lua_pushvalue(L, index);
+	if (lua_pcall(L, 1, 0, 0) != 0) {
+		throw Lua::Exception(lua_tostring(L, -1));
+	}
+	lua_pop(L, 1);
+}
+
+boost::optional<std::string> Swift::Lua::getStringField(lua_State* L, int index, const std::string& field) {
+	lua_getfield(L, index, field.c_str());
+	// Seems to generate warnings with some versions of CLang that i can't turn off.
+	// Leaving the more elegant code here, hoping we can re-enable it later (newer boost? c++11?).
+	// The same applies to the other get*Field functions.
+	//BOOST_SCOPE_EXIT(&L) { lua_pop(L,1); } BOOST_SCOPE_EXIT_END
+	//return lua_isstring(L, -1) ? std::string(lua_tostring(L, -1)) : boost::optional<std::string>();
+	
+	boost::optional<std::string> result;
+	if (lua_isstring(L, -1)) {
+		result = std::string(lua_tostring(L, -1));
+	}
+	lua_pop(L, 1);
+	return result;
+}
+
+boost::optional<bool> Swift::Lua::getBooleanField(lua_State* L, int index, const std::string& field) {
+	lua_getfield(L, index, field.c_str());
+	boost::optional<bool> result;
+	if (lua_isboolean(L, -1)) {
+		result = lua_toboolean(L, -1);
+	}
+	lua_pop(L, 1);
+	return result;
+}
+
+boost::optional<int> Swift::Lua::getIntField(lua_State* L, int index, const std::string& field) {
+	lua_getfield(L, index, field.c_str());
+	boost::optional<int> result;
+	if (lua_isnumber(L, -1)) {
+		result = boost::numeric_cast<int>(lua_tonumber(L, -1));
+	}
+	lua_pop(L, 1);
+	return result;
+}