Mercurial Hosting > luan
annotate src/luan/LuanBit.java @ 130:0594c132888b
cleanup
git-svn-id: https://luan-java.googlecode.com/svn/trunk@131 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Tue, 10 Jun 2014 02:43:40 +0000 |
parents | d7be9b3abf1a |
children | 14281d5bd36f |
rev | line source |
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88
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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 |
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5 |
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6 public final class LuanBit { |
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7 public final LuanState luan; |
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8 public final LuanElement el; |
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9 |
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10 LuanBit(LuanState luan,LuanElement el) { |
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11 this.luan = luan; |
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12 this.el = el; |
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13 } |
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14 |
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15 public LuanException exception(Object msg) { |
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16 return new LuanException(this,msg); |
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17 } |
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18 |
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19 public Object call(LuanFunction fn,String fnName,Object[] args) throws LuanException { |
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20 List<StackTraceElement> stackTrace = luan.stackTrace; |
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21 stackTrace.add( new StackTraceElement(el,fnName) ); |
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22 try { |
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23 return fn.call(luan,args); |
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24 } finally { |
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25 stackTrace.remove(stackTrace.size()-1); |
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26 } |
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27 } |
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28 |
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29 public String checkString(Object obj) throws LuanException { |
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30 String s = Luan.asString(obj); |
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31 if( s == null ) |
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32 throw exception( "attempt to use a " + Luan.type(obj) + " as a string" ); |
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33 return s; |
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34 } |
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35 |
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36 public Number checkNumber(Object obj) throws LuanException { |
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37 Number n = Luan.toNumber(obj); |
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38 if( n == null ) |
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39 throw exception( "attempt to perform arithmetic on a " + Luan.type(obj) + " value" ); |
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40 return n; |
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41 } |
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42 |
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43 public LuanFunction checkFunction(Object obj) throws LuanException { |
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44 if( obj instanceof LuanFunction ) |
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45 return (LuanFunction)obj; |
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46 throw exception( "attempt to call a " + Luan.type(obj) + " value" ); |
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47 } |
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48 |
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49 public String toString(Object obj) throws LuanException { |
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50 LuanFunction fn = getHandlerFunction("__tostring",obj); |
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51 if( fn != null ) |
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52 return checkString( Luan.first( call(fn,"__tostring",new Object[]{obj}) ) ); |
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53 return Luan.toString(obj); |
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54 } |
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55 |
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56 public String repr(Object obj) throws LuanException { |
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57 LuanFunction fn = getHandlerFunction("__repr",obj); |
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58 if( fn != null ) |
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59 return checkString( Luan.first( call(fn,"__repr",new Object[]{obj}) ) ); |
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60 String repr = Luan.repr(obj); |
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61 if( repr==null ) |
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62 throw exception( "value '" + obj + "' doesn't support repr()" ); |
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63 return repr; |
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64 } |
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65 |
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66 public LuanFunction getHandlerFunction(String op,Object obj) throws LuanException { |
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67 Object f = luan.getHandler(op,obj); |
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68 if( f == null ) |
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69 return null; |
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70 return checkFunction(f); |
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71 } |
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72 |
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73 public LuanFunction getBinHandler(String op,Object o1,Object o2) throws LuanException { |
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74 LuanFunction f1 = getHandlerFunction(op,o1); |
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75 if( f1 != null ) |
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76 return f1; |
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77 return getHandlerFunction(op,o2); |
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78 } |
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79 |
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80 public boolean isLessThan(Object o1,Object o2) throws LuanException { |
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81 if( o1 instanceof Number && o2 instanceof Number ) { |
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82 Number n1 = (Number)o1; |
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83 Number n2 = (Number)o2; |
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84 return n1.doubleValue() < n2.doubleValue(); |
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85 } |
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86 if( o1 instanceof String && o2 instanceof String ) { |
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87 String s1 = (String)o1; |
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88 String s2 = (String)o2; |
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89 return s1.compareTo(s2) < 0; |
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90 } |
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91 LuanFunction fn = getBinHandler("__lt",o1,o2); |
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92 if( fn != null ) |
112
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93 return Luan.toBoolean( Luan.first(call(fn,"__lt",new Object[]{o1,o2})) ); |
88
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94 throw exception( "attempt to compare " + Luan.type(o1) + " with " + Luan.type(o2) ); |
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95 } |
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96 |
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97 public Object arithmetic(String op,Object o1,Object o2) throws LuanException { |
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98 LuanFunction fn = getBinHandler(op,o1,o2); |
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99 if( fn != null ) |
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100 return Luan.first(call(fn,op,new Object[]{o1,o2})); |
88
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101 String type = Luan.toNumber(o1)==null ? Luan.type(o1) : Luan.type(o2); |
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102 throw exception("attempt to perform arithmetic on a "+type+" value"); |
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103 } |
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104 |
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105 } |