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0563755dba
This actually makes the project take longer to build, probably because of it no longer getting precompiled, but this is the first step of many in an effort to decouple them a bit to make things more sensible.
51 lines
1.8 KiB
C++
51 lines
1.8 KiB
C++
#pragma once
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#include "framework.h"
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#include <sol.hpp>
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class LuaHandler {
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protected:
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sol::state* m_lua;
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~LuaHandler() = default;
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public:
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LuaHandler(sol::state* lua);
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LuaHandler(LuaHandler const &) = delete;
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LuaHandler& operator=(LuaHandler const &) = delete;
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void ExecuteScript(const std::string & luaFilename);
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void ExecuteString(const std::string & command);
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template <typename T>void MakeReadOnlyTable(std::string const& tableName, T const& container)
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{
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auto mt = tableName + "Meta";
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// Put all the data in the metatable
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m_lua->set(mt, sol::as_table(container));
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auto mtmt = tableName + "MetaMeta";
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m_lua->create_named_table(mtmt);
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// TODO Make these not raise exceptions by default but just do ScriptAsserts -- squidshire, 29/08/2021
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// Make the metatable's metatable's __index throw an error so that trying to use a variable
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// that doesn't exist just errors.
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m_lua->safe_script(mtmt + ".__index = function(t, key) error('" + tableName +" has no member \"' .. tostring(key) .. '\"') end");
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m_lua->safe_script("setmetatable(" + mt + ", " + mtmt + ")");
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// Make the metatable's __index refer to itself so that requests
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// to the main table will go through to the metatable (and thus the
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// container's members)
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m_lua->safe_script(mt + ".__index = " + mt);
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// Don't allow the table to have new elements put into it
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m_lua->safe_script(mt + ".__newindex = function() error('" + tableName + " is read-only') end");
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// Protect the metatable
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m_lua->safe_script(mt + ".__metatable = 'metatable is protected'");
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m_lua->create_named_table(tableName);
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m_lua->safe_script("setmetatable(" + tableName + ", " + mt + ")");
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// point the initial metatable variable away from its contents. this is just for cleanliness
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m_lua->safe_script(mt + " = nil");
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m_lua->safe_script(mtmt + " = nil");
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}
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};
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