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view src/luan/interp/LuaClosure.java @ 32:c3eab5a3ce3c
implement closures
git-svn-id: https://luan-java.googlecode.com/svn/trunk@33 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Fri, 14 Dec 2012 05:40:35 +0000 |
parents | 5cf15507d77e |
children | e3624b7cd603 |
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package luan.interp; import luan.LuaFunction; import luan.LuaState; import luan.LuaException; final class LuaClosure extends LuaFunction { private final Chunk chunk; final UpValue[] upValues; private final static UpValue[] NO_UP_VALUES = new UpValue[0]; LuaClosure(Chunk chunk,LuaStateImpl lua) { this.chunk = chunk; UpValue.Getter[] upValueGetters = chunk.upValueGetters; if( upValueGetters.length==0 ) { upValues = NO_UP_VALUES; } else { upValues = new UpValue[upValueGetters.length]; for( int i=0; i<upValues.length; i++ ) { upValues[i] = upValueGetters[i].get(lua); } } } public Object[] call(LuaState lua,Object... args) throws LuaException { return call(this,(LuaStateImpl)lua,args); } private static Object[] call(LuaClosure closure,LuaStateImpl lua,Object[] args) throws LuaException { while(true) { Chunk chunk = closure.chunk; Object[] varArgs = null; if( chunk.isVarArg ) { if( args.length > chunk.numArgs ) { varArgs = new Object[ args.length - chunk.numArgs ]; for( int i=0; i<varArgs.length; i++ ) { varArgs[i] = args[chunk.numArgs+i]; } } else { varArgs = LuaFunction.EMPTY_RTN; } } Object[] stack = lua.newFrame(closure,chunk.stackSize,varArgs); final int n = Math.min(args.length,chunk.numArgs); for( int i=0; i<n; i++ ) { stack[i] = args[i]; } Object[] returnValues; LuaClosure tailFn; try { chunk.block.eval(lua); } catch(ReturnException e) { } finally { returnValues = lua.returnValues; closure = lua.tailFn; lua.popFrame(); } if( closure == null ) return returnValues; args = returnValues; } } }