Mercurial Hosting > luan
annotate src/luan/LuanState.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 |
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children | 8ede219cd111 |
rev | line source |
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48
64ecb7a3aad7
rename Lua to Luan
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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1 package luan; |
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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 |
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6 |
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7 public abstract class LuanState { |
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8 private final LuanTable global = new LuanTable(); |
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9 private final List<MetatableGetter> mtGetters = new ArrayList<MetatableGetter>(); |
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10 final List<StackTraceElement> stackTrace = new ArrayList<StackTraceElement>(); |
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11 |
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12 public final LuanTable global() { |
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13 return global; |
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14 } |
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15 |
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16 public final LuanTable getMetatable(Object obj) { |
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17 if( obj instanceof LuanTable ) { |
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18 LuanTable table = (LuanTable)obj; |
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19 return table.getMetatable(); |
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20 } |
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21 for( MetatableGetter mg : mtGetters ) { |
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22 LuanTable table = mg.getMetatable(obj); |
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23 if( table != null ) |
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24 return table; |
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25 } |
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26 return null; |
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27 } |
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28 |
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29 public final void addMetatableGetter(MetatableGetter mg) { |
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30 mtGetters.add(mg); |
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31 } |
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32 |
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33 public Object[] call(LuanFunction fn,LuanElement calledFrom,String fnName,Object... args) throws LuanException { |
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34 stackTrace.add( new StackTraceElement(calledFrom,fnName) ); |
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35 try { |
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36 return fn.call(this,args); |
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37 } finally { |
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38 stackTrace.remove(stackTrace.size()-1); |
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39 } |
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40 } |
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41 |
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42 public final String checkString(LuanElement el,Object obj) throws LuanException { |
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43 String s = Luan.asString(obj); |
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44 if( s == null ) |
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45 throw new LuanException( this, el, "attempt to use a " + Luan.type(obj) + " as a string" ); |
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46 return s; |
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47 } |
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48 |
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49 public final Number checkNumber(LuanElement el,Object obj) throws LuanException { |
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50 Number n = Luan.toNumber(obj); |
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51 if( n == null ) |
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52 throw new LuanException( this, el, "attempt to perform arithmetic on a " + Luan.type(obj) + " value" ); |
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53 return n; |
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54 } |
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55 |
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56 public final LuanFunction checkFunction(LuanElement el,Object obj) throws LuanException { |
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57 if( obj instanceof LuanFunction ) |
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58 return (LuanFunction)obj; |
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59 throw new LuanException( this, el, "attempt to call a " + Luan.type(obj) + " value" ); |
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60 } |
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61 |
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62 public final String toString(LuanElement el,Object obj) throws LuanException { |
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63 LuanFunction fn = getHandlerFunction(el,"__tostring",obj); |
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64 if( fn != null ) |
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65 return checkString( el, Luan.first( call(fn,el,"__tostring",obj) ) ); |
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66 if( obj == null ) |
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67 return "nil"; |
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68 if( obj instanceof Number ) |
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69 return Luan.toString((Number)obj); |
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70 if( obj instanceof LuanException ) { |
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71 LuanException le = (LuanException)obj; |
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72 return le.getMessage(); |
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73 } |
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74 return obj.toString(); |
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75 } |
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76 |
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77 public final LuanFunction getHandlerFunction(LuanElement el,String op,Object obj) throws LuanException { |
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78 Object f = getHandler(op,obj); |
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79 if( f == null ) |
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80 return null; |
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81 return checkFunction(el,f); |
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82 } |
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83 |
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84 public final Object getHandler(String op,Object obj) { |
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85 LuanTable t = getMetatable(obj); |
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86 return t==null ? null : t.get(op); |
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87 } |
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88 |
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89 |
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90 public final LuanFunction getBinHandler(LuanElement el,String op,Object o1,Object o2) throws LuanException { |
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91 LuanFunction f1 = getHandlerFunction(el,op,o1); |
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92 if( f1 != null ) |
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93 return f1; |
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94 return getHandlerFunction(el,op,o2); |
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95 } |
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96 |
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97 public final boolean isLessThan(LuanElement el,Object o1,Object o2) throws LuanException { |
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98 if( o1 instanceof Number && o2 instanceof Number ) { |
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99 Number n1 = (Number)o1; |
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100 Number n2 = (Number)o2; |
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101 return n1.doubleValue() < n2.doubleValue(); |
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102 } |
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103 if( o1 instanceof String && o2 instanceof String ) { |
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104 String s1 = (String)o1; |
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105 String s2 = (String)o2; |
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106 return s1.compareTo(s2) < 0; |
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107 } |
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108 LuanFunction fn = getBinHandler(el,"__lt",o1,o2); |
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109 if( fn != null ) |
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110 return Luan.toBoolean( Luan.first(call(fn,el,"__lt",o1,o2)) ); |
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111 throw new LuanException( this, el, "attempt to compare " + Luan.type(o1) + " with " + Luan.type(o2) ); |
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112 } |
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113 } |