Mercurial Hosting > luan
annotate src/luan/interp/UpValue.java @ 48:64ecb7a3aad7
rename Lua to Luan
git-svn-id: https://luan-java.googlecode.com/svn/trunk@49 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Fri, 28 Dec 2012 03:29:12 +0000 |
parents | 0cdc1da466ee |
children | 8ede219cd111 |
rev | line source |
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1 package luan.interp; |
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2 |
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3 |
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4 final class UpValue { |
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5 private Object[] stack; |
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6 private int index; |
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7 private boolean isClosed = false; |
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8 private Object value; |
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9 |
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10 UpValue(Object[] stack,int index) { |
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11 this.stack = stack; |
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12 this.index = index; |
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13 } |
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14 |
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15 UpValue(Object value) { |
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16 this.value = value; |
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17 this.isClosed = true; |
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18 } |
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19 |
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20 Object get() { |
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21 return isClosed ? value : stack[index]; |
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22 } |
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23 |
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24 void set(Object value) { |
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25 if( isClosed ) { |
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26 this.value = value; |
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27 } else { |
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28 stack[index] = value; |
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29 } |
32
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30 } |
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31 |
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32 void close() { |
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33 value = stack[index]; |
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34 isClosed = true; |
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35 stack = null; |
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36 } |
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37 |
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38 static interface Getter { |
48
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39 public UpValue get(LuanStateImpl lua); |
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40 } |
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41 |
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42 static final class StackGetter implements Getter { |
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43 private final int index; |
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44 |
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45 StackGetter(int index) { |
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46 this.index = index; |
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47 } |
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48 |
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49 public UpValue get(LuanStateImpl lua) { |
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50 return lua.getUpValue(index); |
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51 } |
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52 } |
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53 |
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54 static final class NestedGetter implements Getter { |
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55 private final int index; |
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56 |
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57 NestedGetter(int index) { |
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58 this.index = index; |
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59 } |
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60 |
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61 public UpValue get(LuanStateImpl lua) { |
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62 return lua.closure().upValues[index]; |
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63 } |
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64 } |
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65 |
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66 static final Getter globalGetter = new Getter() { |
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67 public UpValue get(LuanStateImpl lua) { |
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68 return new UpValue(lua.global()); |
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69 } |
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70 }; |
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71 |
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72 } |