Mercurial Hosting > luan
annotate core/src/luan/LuanBit.java @ 573:894f991baac5
remove LuanServlet
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Sun, 12 Jul 2015 23:04:47 -0600 |
parents | f1601a4ce1aa |
children | 6cc2f047019b |
rev | line source |
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88
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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 |
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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) throws LuanException { |
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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 StackTraceElement[] stackTrace() { |
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20 List<StackTraceElement> stackTrace = luan.stackTrace; |
460 | 21 if( el != null ) |
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22 stackTrace.add(new StackTraceElement(el,null)); |
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23 StackTraceElement[] rtn = stackTrace.toArray(new StackTraceElement[0]); |
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24 if( el != null ) |
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25 stackTrace.remove(stackTrace.size()-1); |
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26 return rtn; |
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27 } |
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28 |
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29 public void dumpStack() { |
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30 System.err.println( stackTrace() ); |
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31 } |
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32 |
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33 public Object call(LuanFunction fn,String fnName,Object[] args) throws LuanException { |
460 | 34 if( el == null ) |
35 return fn.call(luan,args); | |
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36 List<StackTraceElement> stackTrace = luan.stackTrace; |
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37 stackTrace.add( new StackTraceElement(el,fnName) ); |
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38 try { |
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39 return fn.call(luan,args); |
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40 } catch(StackOverflowError e) { |
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41 throw exception("stack overflow"); |
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42 } finally { |
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43 stackTrace.remove(stackTrace.size()-1); |
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44 } |
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45 } |
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46 |
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47 public String checkString(Object obj) throws LuanException { |
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48 if( obj instanceof String ) |
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49 return (String)obj; |
460 | 50 if( el != null ) { |
51 throw exception( "attempt to use '"+el.text()+"' (a " + Luan.type(obj) + " value) as a string" ); | |
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52 } else { |
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53 throw exception( "attempt to use a " + Luan.type(obj) + " as a string" ); |
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54 } |
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55 } |
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56 |
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57 public Number checkNumber(Object obj) throws LuanException { |
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58 if( obj instanceof Number ) |
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59 return (Number)obj; |
460 | 60 if( el != null ) { |
61 throw exception( "attempt to perform arithmetic on '"+el.text()+"' (a " + Luan.type(obj) + " value)" ); | |
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62 } else { |
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63 throw exception( "attempt to perform arithmetic on a " + Luan.type(obj) + " value" ); |
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64 } |
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65 } |
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66 |
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67 public LuanFunction checkFunction(Object obj) throws LuanException { |
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68 if( obj instanceof LuanFunction ) |
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69 return (LuanFunction)obj; |
460 | 70 if( el != null ) { |
71 throw exception( "attempt to call '"+el.text()+"' (a " + Luan.type(obj) + " value)" ); | |
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72 } else { |
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73 throw exception( "attempt to call a " + Luan.type(obj) + " value" ); |
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74 } |
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75 } |
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76 |
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77 public Boolean checkBoolean(Object obj) throws LuanException { |
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78 if( obj instanceof Boolean ) |
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79 return (Boolean)obj; |
460 | 80 if( el != null ) { |
81 throw exception( "attempt to use '"+el.text()+"' (a " + Luan.type(obj) + " value) as a boolean" ); | |
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82 } else { |
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83 throw exception( "attempt to use a " + Luan.type(obj) + " as a boolean" ); |
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84 } |
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85 } |
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86 |
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87 public LuanFunction getHandlerFunction(String op,LuanTable t) throws LuanException { |
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88 Object f = t.getHandler(op); |
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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 if( o1 instanceof LuanTable ) { |
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96 LuanFunction f1 = getHandlerFunction(op,(LuanTable)o1); |
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97 if( f1 != null ) |
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98 return f1; |
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99 } |
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100 return o2 instanceof LuanTable ? getHandlerFunction(op,(LuanTable)o2) : null; |
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101 } |
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102 |
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103 public boolean isLessThan(Object o1,Object o2) throws LuanException { |
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104 if( o1 instanceof Number && o2 instanceof Number ) { |
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105 Number n1 = (Number)o1; |
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106 Number n2 = (Number)o2; |
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107 return n1.doubleValue() < n2.doubleValue(); |
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108 } |
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109 if( o1 instanceof String && o2 instanceof String ) { |
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110 String s1 = (String)o1; |
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111 String s2 = (String)o2; |
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112 return s1.compareTo(s2) < 0; |
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113 } |
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114 LuanFunction fn = getBinHandler("__lt",o1,o2); |
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115 if( fn != null ) |
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116 return checkBoolean( Luan.first(call(fn,"__lt",new Object[]{o1,o2})) ); |
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117 throw exception( "attempt to compare " + Luan.type(o1) + " with " + Luan.type(o2) ); |
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118 } |
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119 |
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120 public Object arithmetic(String op,Object o1,Object o2) throws LuanException { |
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121 LuanFunction fn = getBinHandler(op,o1,o2); |
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122 if( fn != null ) |
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123 return Luan.first(call(fn,op,new Object[]{o1,o2})); |
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124 String type = !(o1 instanceof Number) ? Luan.type(o1) : Luan.type(o2); |
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125 throw exception("attempt to perform arithmetic on a "+type+" value"); |
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126 } |
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127 |
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128 public String toString(Object obj) throws LuanException { |
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129 if( obj instanceof LuanTable ) { |
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130 LuanTable tbl = (LuanTable)obj; |
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131 return tbl.toString(this); |
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132 } |
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133 if( obj == null ) |
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134 return "nil"; |
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135 if( obj instanceof Number ) |
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136 return Luan.toString((Number)obj); |
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137 if( obj instanceof byte[] ) |
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138 return "binary: " + Integer.toHexString(obj.hashCode()); |
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139 return obj.toString(); |
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140 } |
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141 |
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142 } |