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annotate src/luan/interp/Closure.java @ 49:8ede219cd111

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add WebShell git-svn-id: https://luan-java.googlecode.com/svn/trunk@50 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Fri, 28 Dec 2012 19:35:04 +0000
parents 64ecb7a3aad7
children 4bf3d0c0b6b9
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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1 package luan.interp;
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3 import luan.LuanFunction;
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4 import luan.LuanState;
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5 import luan.LuanElement;
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6 import luan.LuanException;
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9 final class Closure extends LuanFunction {
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10 private final Chunk chunk;
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11 final UpValue[] upValues;
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12 private final static UpValue[] NO_UP_VALUES = new UpValue[0];
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14 Closure(LuanStateImpl luan,Chunk chunk) {
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15 this.chunk = chunk;
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16 UpValue.Getter[] upValueGetters = chunk.upValueGetters;
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17 if( upValueGetters.length==0 ) {
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18 upValues = NO_UP_VALUES;
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19 } else {
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20 upValues = new UpValue[upValueGetters.length];
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21 for( int i=0; i<upValues.length; i++ ) {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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22 upValues[i] = upValueGetters[i].get(luan);
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23 }
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24 }
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25 }
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27 public Object[] call(LuanState luan,Object[] args) throws LuanException {
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28 return call(this,(LuanStateImpl)luan,args);
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29 }
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31 private static Object[] call(Closure closure,LuanStateImpl luan,Object[] args) throws LuanException {
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32 while(true) {
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33 Chunk chunk = closure.chunk;
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34 Object[] varArgs = null;
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35 if( chunk.isVarArg ) {
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36 if( args.length > chunk.numArgs ) {
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37 varArgs = new Object[ args.length - chunk.numArgs ];
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38 for( int i=0; i<varArgs.length; i++ ) {
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39 varArgs[i] = args[chunk.numArgs+i];
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40 }
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41 } else {
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42 varArgs = LuanFunction.EMPTY_RTN;
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43 }
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44 }
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45 Object[] stack = luan.newFrame(closure,chunk.stackSize,varArgs);
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46 final int n = Math.min(args.length,chunk.numArgs);
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47 for( int i=0; i<n; i++ ) {
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48 stack[i] = args[i];
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49 }
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50 Object[] returnValues;
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51 Closure tailFn;
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52 try {
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53 chunk.block.eval(luan);
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54 } catch(ReturnException e) {
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55 } finally {
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56 returnValues = luan.returnValues;
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57 closure = luan.tailFn;
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58 luan.popFrame();
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59 }
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60 if( closure == null )
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61 return returnValues;
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62 args = returnValues;
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63 }
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64 }
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66 }