Mercurial Hosting > luan
annotate src/luan/interp/LuaStateImpl.java @ 36:2a35154aec14
implement more basic lib functions
git-svn-id: https://luan-java.googlecode.com/svn/trunk@37 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Tue, 18 Dec 2012 09:53:42 +0000 |
parents | 0cdc1da466ee |
children | 8a57ebfdfd78 |
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1 package luan.interp; |
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2 |
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3 import luan.Lua; |
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4 import luan.LuaState; |
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5 import luan.LuaTable; |
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6 import luan.LuaFunction; |
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7 import luan.LuaException; |
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8 |
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9 |
31
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10 final class LuaStateImpl implements LuaState { |
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11 private final LuaTable global = new LuaTable(); |
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12 |
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13 @Override public LuaTable global() { |
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14 return global; |
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15 } |
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16 |
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17 @Override public String toString(Object obj) throws LuaException { |
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18 LuaFunction fn = Utils.getHandlerFunction("__tostring",obj); |
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19 if( fn != null ) |
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20 return Lua.checkString( Utils.first( fn.call(this,obj) ) ); |
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21 if( obj == null ) |
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22 return "nil"; |
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23 return obj.toString(); |
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24 } |
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25 |
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26 private static class Frame { |
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27 final Frame previousFrame; |
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28 final LuaClosure closure; |
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29 final Object[] stack; |
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30 final Object[] varArgs; |
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31 UpValue[] downValues = null; |
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32 |
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33 Frame( Frame previousFrame, LuaClosure closure, int stackSize, Object[] varArgs) { |
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34 this.previousFrame = previousFrame; |
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35 this.closure = closure; |
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36 this.stack = new Object[stackSize]; |
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37 this.varArgs = varArgs; |
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38 } |
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39 |
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40 void stackClear(int start,int end) { |
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41 if( downValues != null ) { |
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42 for( int i=start; i<end; i++ ) { |
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43 UpValue downValue = downValues[i]; |
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44 if( downValue != null ) { |
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45 downValue.close(); |
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46 downValues[i] = null; |
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47 } |
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48 } |
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49 } |
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50 for( int i=start; i<end; i++ ) { |
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51 stack[i] = null; |
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52 } |
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53 } |
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54 |
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55 UpValue getUpValue(int index) { |
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56 if( downValues==null ) |
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57 downValues = new UpValue[stack.length]; |
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58 if( downValues[index] == null ) |
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59 downValues[index] = new UpValue(stack,index); |
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60 return downValues[index]; |
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61 } |
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62 } |
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63 |
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64 private Frame frame = null; |
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65 Object[] returnValues; |
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66 LuaClosure tailFn; |
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67 |
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68 // returns stack |
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69 Object[] newFrame(LuaClosure closure, int stackSize, Object[] varArgs) { |
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70 frame = new Frame(frame,closure,stackSize,varArgs); |
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71 return frame.stack; |
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72 } |
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73 |
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74 void popFrame() { |
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75 returnValues = LuaFunction.EMPTY_RTN; |
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76 tailFn = null; |
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77 frame = frame.previousFrame; |
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78 } |
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79 |
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80 Object stackGet(int index) { |
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81 return frame.stack[index]; |
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82 } |
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83 |
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84 void stackSet(int index,Object value) { |
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85 frame.stack[index] = value; |
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86 } |
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87 |
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88 void stackClear(int start,int end) { |
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89 frame.stackClear(start,end); |
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90 } |
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91 |
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92 Object[] varArgs() { |
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93 return frame.varArgs; |
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94 } |
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95 |
32
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96 LuaClosure closure() { |
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97 return frame.closure; |
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98 } |
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99 |
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100 UpValue getUpValue(int index) { |
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101 return frame.getUpValue(index); |
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102 } |
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103 } |