Mercurial Hosting > luan
annotate core/src/luan/impl/Closure.java @ 642:c4216a583de4 0.17
add links to functions in manual
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Wed, 23 Mar 2016 15:07:06 -0600 |
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1 package luan.impl; |
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2 |
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3 import luan.Luan; |
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4 import luan.LuanFunction; |
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5 import luan.LuanState; |
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6 import luan.LuanElement; |
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7 import luan.LuanException; |
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8 import luan.DeepCloner; |
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9 import luan.DeepCloneable; |
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10 |
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11 |
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12 final class Closure extends LuanFunction implements DeepCloneable { |
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13 final FnDef fnDef; |
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14 private UpValue[] upValues; |
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15 |
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16 Closure(LuanStateImpl luan,FnDef fnDef) throws LuanException { |
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17 this.fnDef = fnDef; |
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18 UpValue.Getter[] upValueGetters = fnDef.upValueGetters; |
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19 this.upValues = new UpValue[upValueGetters.length]; |
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20 for( int i=0; i<upValues.length; i++ ) { |
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21 upValues[i] = upValueGetters[i].get(luan); |
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22 } |
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23 } |
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24 |
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25 private Closure(Closure c) { |
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26 this.fnDef = c.fnDef; |
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27 } |
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28 |
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29 @Override public Closure shallowClone() { |
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30 return new Closure(this); |
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31 } |
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32 |
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33 @Override public void deepenClone(DeepCloneable clone,DeepCloner cloner) { |
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34 ((Closure)clone).upValues = (UpValue[])cloner.deepClone(upValues); |
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35 } |
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36 |
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37 UpValue[] upValues() { |
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38 return upValues; |
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39 } |
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40 |
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41 @Override public Object call(LuanState luan,Object[] args) throws LuanException { |
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42 try { |
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43 return call(this,(LuanStateImpl)luan,args); |
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44 } catch(StackOverflowError e) { |
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45 throw new LuanException(luan, "stack overflow" ); |
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46 } |
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47 } |
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48 |
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49 private static Object call(Closure closure,LuanStateImpl luan,Object[] args) throws LuanException { |
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50 while(true) { |
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51 FnDef fnDef = closure.fnDef; |
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52 Object[] varArgs = null; |
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53 if( fnDef.isVarArg ) { |
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54 if( args.length > fnDef.numArgs ) { |
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55 varArgs = new Object[ args.length - fnDef.numArgs ]; |
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56 for( int i=0; i<varArgs.length; i++ ) { |
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57 varArgs[i] = args[fnDef.numArgs+i]; |
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58 } |
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59 } else { |
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60 varArgs = LuanFunction.NOTHING; |
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61 } |
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62 } |
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63 Object[] stack = luan.newFrame(closure,fnDef.stackSize,varArgs); |
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64 final int n = Math.min(args.length,fnDef.numArgs); |
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65 for( int i=0; i<n; i++ ) { |
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66 stack[i] = args[i]; |
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67 } |
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68 Object returnValues; |
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69 try { |
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70 fnDef.block.eval(luan); |
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71 } catch(ReturnException e) { |
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72 } finally { |
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73 returnValues = luan.returnValues; |
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74 closure = luan.tailFn; |
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75 luan.popFrame(); |
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76 } |
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77 if( closure == null ) |
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78 return returnValues; |
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79 args = Luan.array(returnValues); |
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80 } |
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81 } |
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82 |
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83 } |