GServer-v2/server/include/scripting/v8/V8ScriptWrappers.h

#ifndef V8SCRIPTWRAPPERS_H
#define V8SCRIPTWRAPPERS_H

#include <cstring>
#include <iostream>
#include <regex>
#include <string>

const std::regex word_regex(R"((public[\s]+function[\s]+){1}(\w+)[\s]*\()");

//TODO: Move to CPP-file
inline std::string getPublicFunctions(const std::string_view& code)
{
	std::vector<std::string> eventList;

	std::string s(code);

	auto words_begin = std::sregex_iterator(s.begin(), s.end(), word_regex);
	auto words_end = std::sregex_iterator();

	for (std::sregex_iterator i = words_begin; i != words_end; ++i)
	{
		std::smatch match = *i;

		std::string match_str = match.str();
		if (match.size() == 3)
			eventList.push_back(match[2]);
	}

	std::string varNames = "";
	std::string varNameQuotes = "";
	for (const auto eventName: eventList)
	{
		varNames += eventName + ",";
		varNameQuotes += "\"" + eventName + "\"" + ",";
	}
	if (!varNames.empty())
	{
		varNames.pop_back();
		varNameQuotes.pop_back();
	}

	std::string out;
	if (!varNames.empty())
	{
		out += "const __publicNames = [" + varNameQuotes + "];\n";
		out += "const __publicFuncs = [" + varNames + "];\n";
		out += R"(
			for (let i = 0; i < __publicNames.length; ++i) {
				if (__publicFuncs[i]) {
					//print("Found fn ", __publicNames[i]);
					self[__publicNames[i]] = __publicFuncs[i];
				} else {
					//print("Not found fn ", __publicNames[i]);
				}
			}
		)";
	}

	return out;
}

template<typename T>
inline std::string wrapScript(const std::string& code)
{
	return code;
}

template<typename T>
inline std::string wrapScript(const std::string_view& code)
{
	return code.data();
}

class NPC;
template<>
inline std::string wrapScript<NPC>(const std::string_view& code)
{
	// self.onCreated || onCreated, for first declared to take precedence
	// if (onCreated) for latest function to override
	static const char* prefixString = "(function(npc) {"
									  "var onCreated, onTimeout, onNpcWarped, onPlayerChats, onPlayerEnters, onPlayerLeaves, onPlayerTouchsMe, onPlayerLogin, onPlayerLogout;"
									  "const self = npc;"
									  "if (onCreated) self.onCreated = onCreated;"
									  "if (onTimeout) self.onTimeout = onTimeout;"
									  "if (onNpcWarped) self.onNpcWarped = onNpcWarped;"
									  "if (onPlayerChats) self.onPlayerChats = onPlayerChats;"
									  "if (onPlayerEnters) self.onPlayerEnters = onPlayerEnters;"
									  "if (onPlayerLeaves) self.onPlayerLeaves = onPlayerLeaves;"
									  "if (onPlayerTouchsMe) self.onPlayerTouchsMe = onPlayerTouchsMe;"
									  "if (onPlayerLogin) self.onPlayerLogin = onPlayerLogin;"
									  "if (onPlayerLogout) self.onPlayerLogout = onPlayerLogout;"
									  "\n";

	std::string wrappedCode = std::string(prefixString);

	std::string publicFunctions = getPublicFunctions(code);
	std::string fixedCode = std::regex_replace(std::string(code), word_regex, "function $2(");

	wrappedCode.append(fixedCode);
	wrappedCode.append(publicFunctions);
	wrappedCode.append("\n});");
	return wrappedCode;
}

class Player;
template<>
inline std::string wrapScript<Player>(const std::string_view& code)
{
	static const char* prefixString = "(function(player) {"
									  "const self = player;\n";

	std::string wrappedCode = std::string(prefixString);

	std::string publicFunctions = getPublicFunctions(code);
	std::string fixedCode = std::regex_replace(std::string(code), word_regex, "function $2(");

	wrappedCode.append(fixedCode);
	wrappedCode.append(publicFunctions);
	wrappedCode.append("\n});");
	return wrappedCode;
}

class Weapon;
template<>
inline std::string wrapScript<Weapon>(const std::string_view& code)
{
	static const char* prefixString = "(function(weapon) {"
									  "var onCreated, onActionServerSide;"
									  "const self = weapon;"
									  "self.onCreated = onCreated;"
									  "self.onActionServerSide = onActionServerSide;\n";

	std::string wrappedCode = std::string(prefixString);

	std::string publicFunctions = getPublicFunctions(code);
	std::string fixedCode = std::regex_replace(std::string(code), word_regex, "function $2(");

	wrappedCode.append(fixedCode);
	wrappedCode.append(publicFunctions);
	wrappedCode.append("\n});");
	return wrappedCode;
}

#endif