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annotate src/luan/interp/UpValue.java @ 32:c3eab5a3ce3c

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implement closures git-svn-id: https://luan-java.googlecode.com/svn/trunk@33 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Fri, 14 Dec 2012 05:40:35 +0000
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children 0cdc1da466ee
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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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4 final class UpValue {
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5 private Object[] stack;
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6 private int index;
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8 UpValue(Object[] stack,int index) {
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9 this.stack = stack;
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10 this.index = index;
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11 }
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13 Object get() {
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14 return stack[index];
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15 }
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17 void set(Object value) {
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18 stack[index] = value;
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19 }
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21 void close() {
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22 stack = new Object[]{get()};
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23 index = 0;
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24 }
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26 static interface Getter {
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27 public UpValue get(LuaStateImpl lua);
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28 }
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30 static final class StackGetter implements Getter {
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31 private final int index;
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33 StackGetter(int index) {
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34 this.index = index;
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35 }
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37 public UpValue get(LuaStateImpl lua) {
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38 return lua.getUpValue(index);
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39 }
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40 }
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42 static final class NestedGetter implements Getter {
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43 private final int index;
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45 NestedGetter(int index) {
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46 this.index = index;
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47 }
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49 public UpValue get(LuaStateImpl lua) {
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50 return lua.closure().upValues[index];
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51 }
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52 }
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54 }