Mercurial Hosting > luan
annotate core/src/luan/impl/LuanStateImpl.java @ 208:5ba136769034
remove MetatableGetter and use a generic metatable instead
git-svn-id: https://luan-java.googlecode.com/svn/trunk@209 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Tue, 08 Jul 2014 07:04:47 +0000 |
parents | 9fb218211763 |
children | a6bf8ff720f8 |
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1 package luan.impl; |
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2 |
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3 import java.util.List; |
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4 import java.util.ArrayList; |
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5 import java.util.Map; |
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6 import java.util.HashMap; |
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7 import luan.Luan; |
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8 import luan.LuanState; |
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9 import luan.LuanTable; |
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10 import luan.LuanFunction; |
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11 import luan.LuanException; |
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12 import luan.LuanElement; |
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13 import luan.DeepCloner; |
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14 |
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15 |
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16 final class LuanStateImpl extends LuanState { |
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17 |
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18 private static class Frame { |
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19 final Frame previousFrame; |
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20 final Closure closure; |
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21 final Object[] stack; |
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22 final Object[] varArgs; |
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23 UpValue[] downValues = null; |
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24 |
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25 Frame( Frame previousFrame, Closure closure, int stackSize, Object[] varArgs) { |
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26 this.previousFrame = previousFrame; |
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27 this.closure = closure; |
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28 this.stack = new Object[stackSize]; |
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29 this.varArgs = varArgs; |
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30 } |
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31 |
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32 void stackClear(int start,int end) { |
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33 if( downValues != null ) { |
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34 for( int i=start; i<end; i++ ) { |
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35 UpValue downValue = downValues[i]; |
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36 if( downValue != null ) { |
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37 downValue.close(); |
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38 downValues[i] = null; |
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39 } |
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40 } |
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41 } |
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42 for( int i=start; i<end; i++ ) { |
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43 stack[i] = null; |
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44 } |
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45 } |
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46 |
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47 UpValue getUpValue(int index) { |
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48 if( downValues==null ) |
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49 downValues = new UpValue[stack.length]; |
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50 if( downValues[index] == null ) |
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51 downValues[index] = new UpValue(stack,index); |
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52 return downValues[index]; |
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53 } |
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54 } |
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55 |
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56 private Frame frame = null; |
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57 Object returnValues; |
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58 Closure tailFn; |
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59 |
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60 LuanStateImpl() {} |
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61 |
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62 private LuanStateImpl(LuanStateImpl luan) { |
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63 super(luan); |
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64 } |
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65 |
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66 @Override public LuanState shallowClone() { |
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67 // if( frame != null ) |
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68 // throw new IllegalStateException("frame isn't null"); |
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69 return new LuanStateImpl(this); |
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70 } |
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71 |
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72 // returns stack |
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73 Object[] newFrame(Closure closure, int stackSize, Object[] varArgs) { |
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74 returnValues = LuanFunction.NOTHING; |
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75 tailFn = null; |
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76 frame = new Frame(frame,closure,stackSize,varArgs); |
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77 return frame.stack; |
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78 } |
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79 |
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80 void popFrame() { |
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81 returnValues = LuanFunction.NOTHING; |
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82 tailFn = null; |
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83 frame = frame.previousFrame; |
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84 } |
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85 |
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86 Object stackGet(int index) { |
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87 return frame.stack[index]; |
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88 } |
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89 |
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90 void stackSet(int index,Object value) { |
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91 frame.stack[index] = value; |
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92 } |
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93 |
32
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94 void stackClear(int start,int end) { |
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95 frame.stackClear(start,end); |
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96 } |
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97 |
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98 Object[] varArgs() { |
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99 return frame.varArgs; |
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100 } |
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101 |
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102 Closure closure() { |
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103 return frame.closure; |
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104 } |
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105 |
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106 UpValue getUpValue(int index) { |
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107 return frame.getUpValue(index); |
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108 } |
77
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109 |
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110 @Override public LuanTable currentEnvironment() { |
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111 if( frame==null ) |
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112 return null; |
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113 return (LuanTable)frame.closure.upValues()[0].get(); |
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114 } |
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115 |
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116 } |