Mercurial Hosting > luan
annotate src/luan/LuanState.java @ 66:f7e17cfb35f9
minor toString() improvement
git-svn-id: https://luan-java.googlecode.com/svn/trunk@67 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Tue, 22 Jan 2013 00:00:27 +0000 |
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children | f86e4f77ef32 |
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48
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1 package luan; |
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2 |
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3 import java.io.InputStream; |
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4 import java.io.PrintStream; |
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5 import java.util.List; |
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6 import java.util.ArrayList; |
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7 import luan.interp.LuanCompiler; |
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8 import luan.lib.BasicLib; |
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9 import luan.lib.JavaLib; |
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10 import luan.lib.MathLib; |
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11 import luan.lib.StringLib; |
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12 import luan.lib.TableLib; |
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13 import luan.lib.HtmlLib; |
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14 |
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15 |
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16 public abstract class LuanState { |
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17 |
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18 public static LuanState newStandard() { |
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19 LuanState luan = LuanCompiler.newLuanState(); |
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20 BasicLib.register(luan); |
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21 JavaLib.register(luan); |
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22 MathLib.register(luan); |
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23 StringLib.register(luan); |
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24 TableLib.register(luan); |
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25 HtmlLib.register(luan); |
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26 return luan; |
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27 } |
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28 |
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29 public Object[] eval(String cmd,String sourceName) throws LuanException { |
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30 LuanFunction fn = BasicLib.load(this,cmd,sourceName); |
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31 return call(fn,null,null); |
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32 } |
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33 |
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34 |
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35 |
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36 private final LuanTable global = new LuanTable(); |
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37 private final List<MetatableGetter> mtGetters = new ArrayList<MetatableGetter>(); |
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38 final List<StackTraceElement> stackTrace = new ArrayList<StackTraceElement>(); |
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39 |
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40 public InputStream in = System.in; |
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41 public PrintStream out = System.out; |
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42 public PrintStream err = System.err; |
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43 |
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44 public final LuanTable global() { |
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45 return global; |
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46 } |
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47 |
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48 public final LuanTable getMetatable(Object obj) { |
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49 if( obj instanceof LuanTable ) { |
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50 LuanTable table = (LuanTable)obj; |
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51 return table.getMetatable(); |
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52 } |
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53 for( MetatableGetter mg : mtGetters ) { |
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54 LuanTable table = mg.getMetatable(obj); |
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55 if( table != null ) |
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56 return table; |
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57 } |
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58 return null; |
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59 } |
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60 |
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61 public final void addMetatableGetter(MetatableGetter mg) { |
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62 mtGetters.add(mg); |
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63 } |
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64 |
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65 public Object[] call(LuanFunction fn,LuanElement calledFrom,String fnName,Object... args) throws LuanException { |
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66 stackTrace.add( new StackTraceElement(calledFrom,fnName) ); |
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67 try { |
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68 return fn.call(this,args); |
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69 } finally { |
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70 stackTrace.remove(stackTrace.size()-1); |
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71 } |
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72 } |
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73 |
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74 public final String checkString(LuanElement el,Object obj) throws LuanException { |
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75 String s = Luan.asString(obj); |
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76 if( s == null ) |
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77 throw new LuanException( this, el, "attempt to use a " + Luan.type(obj) + " as a string" ); |
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78 return s; |
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79 } |
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80 |
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81 public final Number checkNumber(LuanElement el,Object obj) throws LuanException { |
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82 Number n = Luan.toNumber(obj); |
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83 if( n == null ) |
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84 throw new LuanException( this, el, "attempt to perform arithmetic on a " + Luan.type(obj) + " value" ); |
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85 return n; |
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86 } |
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87 |
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88 public final LuanFunction checkFunction(LuanElement el,Object obj) throws LuanException { |
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89 if( obj instanceof LuanFunction ) |
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90 return (LuanFunction)obj; |
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91 throw new LuanException( this, el, "attempt to call a " + Luan.type(obj) + " value" ); |
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92 } |
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93 |
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94 public final String toString(LuanElement el,Object obj) throws LuanException { |
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95 LuanFunction fn = getHandlerFunction(el,"__tostring",obj); |
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96 if( fn != null ) |
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97 return checkString( el, Luan.first( call(fn,el,"__tostring",obj) ) ); |
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98 return Luan.toString(obj); |
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99 } |
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100 |
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101 public final LuanFunction getHandlerFunction(LuanElement el,String op,Object obj) throws LuanException { |
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102 Object f = getHandler(op,obj); |
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103 if( f == null ) |
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104 return null; |
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105 return checkFunction(el,f); |
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106 } |
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107 |
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108 public final Object getHandler(String op,Object obj) { |
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109 LuanTable t = getMetatable(obj); |
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110 return t==null ? null : t.get(op); |
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111 } |
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112 |
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113 |
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114 public final LuanFunction getBinHandler(LuanElement el,String op,Object o1,Object o2) throws LuanException { |
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115 LuanFunction f1 = getHandlerFunction(el,op,o1); |
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116 if( f1 != null ) |
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117 return f1; |
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118 return getHandlerFunction(el,op,o2); |
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119 } |
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120 |
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121 public final boolean isLessThan(LuanElement el,Object o1,Object o2) throws LuanException { |
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122 if( o1 instanceof Number && o2 instanceof Number ) { |
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123 Number n1 = (Number)o1; |
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124 Number n2 = (Number)o2; |
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125 return n1.doubleValue() < n2.doubleValue(); |
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126 } |
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127 if( o1 instanceof String && o2 instanceof String ) { |
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128 String s1 = (String)o1; |
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129 String s2 = (String)o2; |
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130 return s1.compareTo(s2) < 0; |
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131 } |
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132 LuanFunction fn = getBinHandler(el,"__lt",o1,o2); |
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133 if( fn != null ) |
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134 return Luan.toBoolean( Luan.first(call(fn,el,"__lt",o1,o2)) ); |
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135 throw new LuanException( this, el, "attempt to compare " + Luan.type(o1) + " with " + Luan.type(o2) ); |
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136 } |
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137 } |