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annotate src/luan/LuanBit.java @ 123:d7be9b3abf1a

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minor - rename LuanFunction.EMPTY to NOTHING git-svn-id: https://luan-java.googlecode.com/svn/trunk@124 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Fri, 06 Jun 2014 01:14:18 +0000
parents f5af13062b10
children 0594c132888b
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rev   line source
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
112
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19 public Object call(LuanFunction fn,String fnName) throws LuanException {
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20 return call(fn,fnName,LuanFunction.NOTHING);
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21 }
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22
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23 public Object call(LuanFunction fn,String fnName,Object[] args) throws LuanException {
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24 List<StackTraceElement> stackTrace = luan.stackTrace;
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25 stackTrace.add( new StackTraceElement(el,fnName) );
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26 try {
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27 return fn.call(luan,args);
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28 } finally {
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29 stackTrace.remove(stackTrace.size()-1);
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30 }
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31 }
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32
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33 public String checkString(Object obj) throws LuanException {
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34 String s = Luan.asString(obj);
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35 if( s == null )
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36 throw exception( "attempt to use a " + Luan.type(obj) + " as a string" );
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37 return s;
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38 }
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39
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40 public Number checkNumber(Object obj) throws LuanException {
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41 Number n = Luan.toNumber(obj);
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42 if( n == null )
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43 throw exception( "attempt to perform arithmetic on a " + Luan.type(obj) + " value" );
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44 return n;
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45 }
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46
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47 public LuanFunction checkFunction(Object obj) throws LuanException {
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48 if( obj instanceof LuanFunction )
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49 return (LuanFunction)obj;
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50 throw exception( "attempt to call a " + Luan.type(obj) + " value" );
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51 }
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52
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53 public String toString(Object obj) throws LuanException {
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54 LuanFunction fn = getHandlerFunction("__tostring",obj);
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55 if( fn != null )
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56 return checkString( Luan.first( call(fn,"__tostring",new Object[]{obj}) ) );
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57 return Luan.toString(obj);
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58 }
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59
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60 public String repr(Object obj) throws LuanException {
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61 LuanFunction fn = getHandlerFunction("__repr",obj);
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62 if( fn != null )
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63 return checkString( Luan.first( call(fn,"__repr",new Object[]{obj}) ) );
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64 String repr = Luan.repr(obj);
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65 if( repr==null )
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66 throw exception( "value '" + obj + "' doesn't support repr()" );
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67 return repr;
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68 }
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69
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70 public LuanFunction getHandlerFunction(String op,Object obj) throws LuanException {
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71 Object f = luan.getHandler(op,obj);
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72 if( f == null )
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73 return null;
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74 return checkFunction(f);
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75 }
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76
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77 public LuanFunction getBinHandler(String op,Object o1,Object o2) throws LuanException {
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78 LuanFunction f1 = getHandlerFunction(op,o1);
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79 if( f1 != null )
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80 return f1;
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81 return getHandlerFunction(op,o2);
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82 }
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83
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84 public boolean isLessThan(Object o1,Object o2) throws LuanException {
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85 if( o1 instanceof Number && o2 instanceof Number ) {
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86 Number n1 = (Number)o1;
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87 Number n2 = (Number)o2;
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88 return n1.doubleValue() < n2.doubleValue();
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89 }
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90 if( o1 instanceof String && o2 instanceof String ) {
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91 String s1 = (String)o1;
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92 String s2 = (String)o2;
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93 return s1.compareTo(s2) < 0;
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94 }
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95 LuanFunction fn = getBinHandler("__lt",o1,o2);
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96 if( fn != null )
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97 return Luan.toBoolean( Luan.first(call(fn,"__lt",new Object[]{o1,o2})) );
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98 throw exception( "attempt to compare " + Luan.type(o1) + " with " + Luan.type(o2) );
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99 }
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100
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101 public Object arithmetic(String op,Object o1,Object o2) throws LuanException {
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102 LuanFunction fn = getBinHandler(op,o1,o2);
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103 if( fn != null )
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104 return Luan.first(call(fn,op,new Object[]{o1,o2}));
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105 String type = Luan.toNumber(o1)==null ? Luan.type(o1) : Luan.type(o2);
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106 throw exception("attempt to perform arithmetic on a "+type+" value");
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107 }
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108
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109 }