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/*
* 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 <boost/algorithm/string/trim.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.coreLibIndex);
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.coreLibIndex);
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;
}
void Swift::Lua::registerHelp(lua_State* L, int index, const std::string& description, const std::string& parameters, const std::string& options) {
index = Lua::absoluteOffset(L, index);
lua_rawgeti(L, LUA_REGISTRYINDEX, Sluift::globals.coreLibIndex);
lua_getfield(L, -1, "register_help");
lua_pushvalue(L, index);
lua_newtable(L);
lua_pushstring(L, description.c_str());
lua_rawseti(L, -2, 1);
if (!parameters.empty()) {
std::istringstream s(parameters);
lua_newtable(L);
int i = 1;
for (std::string line; std::getline(s, line); ) {
std::string trimmedLine = boost::trim_copy(line);
if (trimmedLine.empty()) {
continue;
}
size_t splitIndex = trimmedLine.find_first_of(" \t");
std::string key;
std::string value;
if (splitIndex == std::string::npos) {
key = trimmedLine;
}
else {
key = trimmedLine.substr(0, splitIndex);
value = boost::trim_copy(trimmedLine.substr(splitIndex+1));
}
lua_createtable(L, 2, 0);
lua_pushstring(L, key.c_str());
lua_rawseti(L, -2, 1);
lua_pushstring(L, value.c_str());
lua_rawseti(L, -2, 2);
lua_rawseti(L, -2, i++);
}
lua_setfield(L, -2, "parameters");
}
if (!options.empty()) {
std::istringstream s(options);
lua_newtable(L);
for (std::string line; std::getline(s, line); ) {
std::string trimmedLine = boost::trim_copy(line);
if (trimmedLine.empty()) {
continue;
}
size_t splitIndex = trimmedLine.find_first_of(" \t");
std::string key;
std::string value;
if (splitIndex == std::string::npos) {
key = trimmedLine;
}
else {
key = trimmedLine.substr(0, splitIndex);
value = boost::trim_copy(trimmedLine.substr(splitIndex+1));
}
lua_pushstring(L, value.c_str());
lua_setfield(L, -2, key.c_str());
}
lua_setfield(L, -2, "options");
}
if (lua_pcall(L, 2, 0, 0) != 0) {
throw Lua::Exception(lua_tostring(L, -1));
}
lua_pop(L, 1);
}
void Swift::Lua::registerClassHelp(lua_State* L, const std::string& name, const std::string& description) {
lua_rawgeti(L, LUA_REGISTRYINDEX, Sluift::globals.coreLibIndex);
lua_getfield(L, -1, "register_class_help");
lua_pushstring(L, name.c_str());
lua_newtable(L);
lua_pushstring(L, description.c_str());
lua_rawseti(L, -2, 1);
if (lua_pcall(L, 2, 0, 0) != 0) {
throw Lua::Exception(lua_tostring(L, -1));
}
lua_pop(L, 1);
}
void Swift::Lua::registerExtraHelp(lua_State* L, int index, const std::string& name) {
index = Lua::absoluteOffset(L, index);
lua_rawgeti(L, LUA_REGISTRYINDEX, Sluift::globals.coreLibIndex);
lua_getfield(L, -1, "extra_help");
lua_getfield(L, -1, name.c_str());
if (!lua_isnil(L, -1)) {
lua_getfield(L, -3, "register_help");
lua_pushvalue(L, index);
lua_pushvalue(L, -3);
if (lua_pcall(L, 2, 0, 0) != 0) {
throw Lua::Exception(lua_tostring(L, -1));
}
}
lua_pop(L, 3);
}
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Swift