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POLua 5.2::Create a different environment for each script
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  1. POLua 5.2::Create a different environment for each script
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    copied!<p>This is a simplified version of the problem that Im having:</p> <p>[ bot0.lua ]</p> <pre><code>function OnHit(bot) // Where the bot structure and vec3 // generated using SWIG and registered to a // "global" lua_State that I maintain. bot.color = vec3( 1.0, 0.0, 0.0) end; </code></pre> <p>[bot1.lua]</p> <pre><code>function OnHit(bot) bot.color = vec3( 0.0, 1.0, 0.0) end; </code></pre> <p>At loading time, for each script I first do the following (pseudo code):</p> <pre><code>bot-&gt;script-&gt;L = lua_newthread( &lt;Global lua_State where vec3 etc... are registered&gt; ) luaL_loadbuffer( bot-&gt;script-&gt;L, botXXX.lua ... lua_call( bot-&gt;script-&gt;L, ... </code></pre> <p>Then at runtime from my program when a bot get hit I call:</p> <pre><code>luaL_dostring( bot-&gt;script-&gt;L, "OnHit(GetBot(\"&lt;the bot name&gt;\")" ); </code></pre> <p>(Where GetBot is also a function registered in the global lua_State).</p> <p>The problem is that the bot always become green since bot1.lua OnHit is in the last bot file loaded. I thought by using lua_newthread I will be able to have a new definition of OnHit for each "thread" created that will assign the proper color to the bot since Im using a different lua_State when using luaL_dostring. But in fact the lastest OnHit loaded will overwrite the previous one in the the global lua_State environement.</p> <p>My question is: How can I create a different environment for each script so that the correct OnHit will be called for the correct bot->script->L and where I can still have access to all the functions (such as my vec3,GetBot etc... functions) that are registered inside the "global" lua_State environment that I create?</p> <p>[edit]</p> <p>After more research I think what I need is to be able to "sandbox" in C. Am I right?</p> <p>[edit]</p> <p>Actually not really sandboxing, since I want to that if the look up fail in the script environment, the lookup is made to the global environment. Is it even possible?</p>
 

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