module Language.Lsl.Internal.MetaData where

-- constructs meta-data about the LSL+ language, and emits it as XML.

import Language.Lsl.Internal.Constants(Constant(..),allConstants)
import Language.Lsl.Internal.EventSigs(lslEventDescriptors)
import Language.Lsl.Internal.FuncSigs(funcMeta)
import Language.Lsl.Internal.InternalLLFuncs(internalLLFuncNames)
import Language.Lsl.Internal.Type(LSLValue(..),LSLType(..),lslTypeString,lslValString,typeOfLSLValue)
import qualified Language.Lsl.Internal.XmlCreate as X

emit t = X.emit t []
emitSimple t s = X.emitSimple t [] s

-- this is the main function...
printMeta = putStr buildMeta

buildMeta :: String
buildMeta =
    emit "lslmeta" [handlers,functions,constants] ""

emitHandler (name,params,_,_,description) =
    emit "handler" [
        emitSimple "name" name,
        emitParams params',
        emitSimple "description" description]
    where params' = map (\ (x,y) -> (y,x)) params

emitParams params = emit "params" (map emitParam params)
emitParam (name,t) = emit "param" [emitSimple "name"  name, emitSimple "type" (lslTypeString t)]

handlers =
    emit "handlers" (map emitHandler lslEventDescriptors)
    
functions =
    emit "functions" (map emitFunction funcMeta)
    
emitFunction (name,rtype,params,description) =
    emit "function" [
        emitSimple "name" name,
        emitSimple "returns" (if (rtype == LLVoid) then "" else lslTypeString rtype),
        emitParams params,
        emitSimple "description" description,
        emitSimple "stateless" (if (name `elem` internalLLFuncNames) then "true" else "false")]
        
constants =
    emit "constants" (map emitConstant allConstants)
    
emitConstant (Constant name value) =
    emit "constant" [
        emitSimple "name" name,
        emitSimple "type" (lslTypeString $ typeOfLSLValue value),
        emitSimple "value" $ case value of
            SVal s -> (show s)
            KVal k -> (show k)
            VVal x y z -> ("<" ++ show x ++ "," ++ show y ++ "," ++ show z ++ ">")
            RVal x y z s -> ("<" ++ show x ++ "," ++ show y ++ "," ++ show z ++ "," ++ show s ++ ">")
            _ -> lslValString value,
        emitSimple "description" "no description"]