Mercurial Hosting > luan
annotate src/luan/LuanBit.java @ 151:c9100f29fae0
conditions must be type boolean
git-svn-id: https://luan-java.googlecode.com/svn/trunk@152 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Mon, 16 Jun 2014 10:37:06 +0000 |
parents | 14281d5bd36f |
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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 String stackTrace() { |
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20 StringBuilder buf = new StringBuilder(); |
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21 LuanElement el = this.el; |
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22 for( int i = luan.stackTrace.size() - 1; i>=0; i-- ) { |
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23 StackTraceElement stackTraceElement = luan.stackTrace.get(i); |
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24 buf.append( "\n\t" ).append( el.toString(stackTraceElement.fnName) ); |
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25 el = stackTraceElement.call; |
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26 } |
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27 return buf.toString(); |
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28 } |
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29 |
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30 public void dumpStack() { |
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31 System.err.println( stackTrace() ); |
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32 } |
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33 |
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34 public Object call(LuanFunction fn,String fnName,Object[] args) throws LuanException { |
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35 List<StackTraceElement> stackTrace = luan.stackTrace; |
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36 stackTrace.add( new StackTraceElement(el,fnName) ); |
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37 try { |
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38 return fn.call(luan,args); |
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39 } finally { |
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40 stackTrace.remove(stackTrace.size()-1); |
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41 } |
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42 } |
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43 |
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44 public String checkString(Object obj) throws LuanException { |
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45 String s = Luan.asString(obj); |
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46 if( s == null ) |
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47 throw exception( "attempt to use a " + Luan.type(obj) + " as a string" ); |
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48 return s; |
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49 } |
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50 |
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51 public Number checkNumber(Object obj) throws LuanException { |
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52 Number n = Luan.toNumber(obj); |
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53 if( n == null ) |
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54 throw exception( "attempt to perform arithmetic on a " + Luan.type(obj) + " value" ); |
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55 return n; |
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56 } |
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57 |
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58 public LuanFunction checkFunction(Object obj) throws LuanException { |
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59 if( obj instanceof LuanFunction ) |
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60 return (LuanFunction)obj; |
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61 throw exception( "attempt to call a " + Luan.type(obj) + " value" ); |
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62 } |
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63 |
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64 public Boolean checkBoolean(Object obj) throws LuanException { |
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65 if( obj instanceof Boolean ) |
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66 return (Boolean)obj; |
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67 throw exception( "attempt to use a " + Luan.type(obj) + " as a boolean" ); |
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68 } |
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69 |
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70 public String toString(Object obj) throws LuanException { |
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71 LuanFunction fn = getHandlerFunction("__tostring",obj); |
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72 if( fn != null ) |
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73 return checkString( Luan.first( call(fn,"__tostring",new Object[]{obj}) ) ); |
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74 return Luan.toString(obj); |
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75 } |
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76 |
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77 public String repr(Object obj) throws LuanException { |
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78 LuanFunction fn = getHandlerFunction("__repr",obj); |
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79 if( fn != null ) |
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80 return checkString( Luan.first( call(fn,"__repr",new Object[]{obj}) ) ); |
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81 String repr = Luan.repr(obj); |
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82 if( repr==null ) |
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83 throw exception( "value '" + obj + "' doesn't support repr()" ); |
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84 return repr; |
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85 } |
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86 |
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87 public LuanFunction getHandlerFunction(String op,Object obj) throws LuanException { |
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88 Object f = luan.getHandler(op,obj); |
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89 if( f == null ) |
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90 return null; |
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91 return checkFunction(f); |
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92 } |
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93 |
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94 public LuanFunction getBinHandler(String op,Object o1,Object o2) throws LuanException { |
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95 LuanFunction f1 = getHandlerFunction(op,o1); |
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96 if( f1 != null ) |
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97 return f1; |
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98 return getHandlerFunction(op,o2); |
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99 } |
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100 |
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101 public boolean isLessThan(Object o1,Object o2) throws LuanException { |
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102 if( o1 instanceof Number && o2 instanceof Number ) { |
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103 Number n1 = (Number)o1; |
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104 Number n2 = (Number)o2; |
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105 return n1.doubleValue() < n2.doubleValue(); |
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106 } |
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107 if( o1 instanceof String && o2 instanceof String ) { |
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108 String s1 = (String)o1; |
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109 String s2 = (String)o2; |
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110 return s1.compareTo(s2) < 0; |
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111 } |
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112 LuanFunction fn = getBinHandler("__lt",o1,o2); |
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113 if( fn != null ) |
112
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114 return Luan.toBoolean( Luan.first(call(fn,"__lt",new Object[]{o1,o2})) ); |
88
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115 throw exception( "attempt to compare " + Luan.type(o1) + " with " + Luan.type(o2) ); |
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116 } |
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117 |
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118 public Object arithmetic(String op,Object o1,Object o2) throws LuanException { |
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119 LuanFunction fn = getBinHandler(op,o1,o2); |
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120 if( fn != null ) |
112
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121 return Luan.first(call(fn,op,new Object[]{o1,o2})); |
88
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122 String type = Luan.toNumber(o1)==null ? Luan.type(o1) : Luan.type(o2); |
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123 throw exception("attempt to perform arithmetic on a "+type+" value"); |
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124 } |
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125 |
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126 } |