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annotate src/luan/interp/UpValue.java @ 86:6db8f286fa6c

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_ENV is per module, not global git-svn-id: https://luan-java.googlecode.com/svn/trunk@87 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Wed, 27 Feb 2013 08:03:51 +0000
parents 7c08b611125d
children 3c404a296995
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1 package luan.interp;
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3 import luan.DeepCloner;
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4 import luan.DeepCloneable;
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5 import luan.LuanException;
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8 final class UpValue implements DeepCloneable<UpValue> {
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9 private Object[] stack;
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10 private int index;
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11 private boolean isClosed = false;
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12 private Object value;
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14 UpValue(Object[] stack,int index) {
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15 this.stack = stack;
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16 this.index = index;
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17 }
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19 UpValue(Object value) {
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20 this.value = value;
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21 this.isClosed = true;
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22 }
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24 private UpValue() {}
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26 @Override public UpValue shallowClone() {
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27 return new UpValue();
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28 }
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30 @Override public void deepenClone(UpValue clone,DeepCloner cloner) {
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31 clone.isClosed = isClosed;
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32 if( isClosed ) {
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33 clone.value = cloner.get(value);
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34 } else {
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35 clone.stack = cloner.deepClone(stack);
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36 clone.index = index;
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37 }
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38 }
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40 Object get() {
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41 return isClosed ? value : stack[index];
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42 }
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44 void set(Object value) {
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45 if( isClosed ) {
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46 this.value = value;
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47 } else {
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48 stack[index] = value;
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49 }
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50 }
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52 void close() {
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53 value = stack[index];
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54 isClosed = true;
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55 stack = null;
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56 }
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58 static interface Getter {
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59 public UpValue get(LuanStateImpl luan) throws LuanException;
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60 }
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62 static final class StackGetter implements Getter {
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63 private final int index;
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65 StackGetter(int index) {
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66 this.index = index;
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67 }
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69 public UpValue get(LuanStateImpl luan) {
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70 return luan.getUpValue(index);
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71 }
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72 }
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74 static final class NestedGetter implements Getter {
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75 private final int index;
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77 NestedGetter(int index) {
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78 this.index = index;
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79 }
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81 public UpValue get(LuanStateImpl luan) {
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82 return luan.closure().upValues()[index];
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83 }
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84 }
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86 static final class EnvGetter implements Getter {
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88 public UpValue get(LuanStateImpl luan) throws LuanException {
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89 return luan.getUpValue(this);
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90 }
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91 }
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93 static final class ValueGetter implements Getter {
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94 private final UpValue upValue;
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96 ValueGetter(Object value) {
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97 this.upValue = new UpValue(value);
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98 }
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100 public UpValue get(LuanStateImpl luan) {
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101 return upValue;
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102 }
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c3eab5a3ce3c implement closures
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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105 }