Mercurial Hosting > luan
annotate src/luan/LuanState.java @ 73:f86e4f77ef32
add package module
git-svn-id: https://luan-java.googlecode.com/svn/trunk@74 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Tue, 12 Feb 2013 09:46:45 +0000 |
parents | f7e17cfb35f9 |
children | f003338d503b |
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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.PackageLib; |
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10 import luan.lib.JavaLib; |
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11 import luan.lib.MathLib; |
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12 import luan.lib.StringLib; |
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13 import luan.lib.TableLib; |
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14 import luan.lib.HtmlLib; |
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15 |
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16 |
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17 public abstract class LuanState { |
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18 |
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19 public final LuanTable global = new LuanTable(); |
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20 public final LuanTable loaded = new LuanTable(); |
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21 public final LuanTable preload = new LuanTable(); |
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22 |
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23 public InputStream in = System.in; |
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24 public PrintStream out = System.out; |
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25 public PrintStream err = System.err; |
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26 |
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27 private final List<MetatableGetter> mtGetters = new ArrayList<MetatableGetter>(); |
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28 final List<StackTraceElement> stackTrace = new ArrayList<StackTraceElement>(); |
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29 |
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30 |
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31 public Object load(LuanFunction loader,String modName) throws LuanException { |
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32 return load(loader,modName,null); |
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33 } |
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34 |
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35 public Object load(LuanFunction loader,String modName,Object extra) throws LuanException { |
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36 Object mod = Luan.first(call(loader,LuanElement.JAVA,"loader",modName,extra)); |
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37 if( mod == null ) |
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38 mod = true; |
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39 loaded.put(modName,mod); |
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40 return mod; |
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41 } |
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42 |
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43 public static LuanState newStandard() { |
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44 try { |
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45 LuanState luan = LuanCompiler.newLuanState(); |
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46 luan.load(BasicLib.LOADER,BasicLib.NAME); |
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47 luan.load(PackageLib.LOADER,PackageLib.NAME); |
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48 luan.load(JavaLib.LOADER,JavaLib.NAME); |
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49 luan.load(MathLib.LOADER,MathLib.NAME); |
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50 luan.load(StringLib.LOADER,StringLib.NAME); |
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51 luan.load(TableLib.LOADER,TableLib.NAME); |
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52 luan.load(HtmlLib.LOADER,HtmlLib.NAME); |
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53 return luan; |
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54 } catch(LuanException e) { |
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55 throw new RuntimeException(e); |
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56 } |
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57 } |
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58 |
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59 public Object[] eval(String cmd,String sourceName) throws LuanException { |
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60 LuanFunction fn = BasicLib.load(this,cmd,sourceName); |
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61 return call(fn,null,null); |
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62 } |
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63 |
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64 |
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65 public final LuanTable getMetatable(Object obj) { |
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66 if( obj instanceof LuanTable ) { |
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67 LuanTable table = (LuanTable)obj; |
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68 return table.getMetatable(); |
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69 } |
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70 for( MetatableGetter mg : mtGetters ) { |
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71 LuanTable table = mg.getMetatable(obj); |
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72 if( table != null ) |
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73 return table; |
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74 } |
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75 return null; |
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76 } |
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77 |
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78 public final void addMetatableGetter(MetatableGetter mg) { |
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79 mtGetters.add(mg); |
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80 } |
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81 |
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82 public Object[] call(LuanFunction fn,LuanElement calledFrom,String fnName,Object... args) throws LuanException { |
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83 stackTrace.add( new StackTraceElement(calledFrom,fnName) ); |
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84 try { |
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85 return fn.call(this,args); |
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86 } finally { |
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87 stackTrace.remove(stackTrace.size()-1); |
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88 } |
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89 } |
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90 |
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91 public final String checkString(LuanElement el,Object obj) throws LuanException { |
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92 String s = Luan.asString(obj); |
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93 if( s == null ) |
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94 throw new LuanException( this, el, "attempt to use a " + Luan.type(obj) + " as a string" ); |
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95 return s; |
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96 } |
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97 |
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98 public final Number checkNumber(LuanElement el,Object obj) throws LuanException { |
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99 Number n = Luan.toNumber(obj); |
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100 if( n == null ) |
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101 throw new LuanException( this, el, "attempt to perform arithmetic on a " + Luan.type(obj) + " value" ); |
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102 return n; |
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103 } |
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104 |
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105 public final LuanFunction checkFunction(LuanElement el,Object obj) throws LuanException { |
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106 if( obj instanceof LuanFunction ) |
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107 return (LuanFunction)obj; |
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108 throw new LuanException( this, el, "attempt to call a " + Luan.type(obj) + " value" ); |
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109 } |
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110 |
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111 public final String toString(LuanElement el,Object obj) throws LuanException { |
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112 LuanFunction fn = getHandlerFunction(el,"__tostring",obj); |
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113 if( fn != null ) |
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114 return checkString( el, Luan.first( call(fn,el,"__tostring",obj) ) ); |
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115 return Luan.toString(obj); |
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116 } |
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117 |
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118 public final LuanFunction getHandlerFunction(LuanElement el,String op,Object obj) throws LuanException { |
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119 Object f = getHandler(op,obj); |
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120 if( f == null ) |
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121 return null; |
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122 return checkFunction(el,f); |
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123 } |
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124 |
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125 public final Object getHandler(String op,Object obj) { |
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126 LuanTable t = getMetatable(obj); |
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127 return t==null ? null : t.get(op); |
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128 } |
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129 |
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130 |
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131 public final LuanFunction getBinHandler(LuanElement el,String op,Object o1,Object o2) throws LuanException { |
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132 LuanFunction f1 = getHandlerFunction(el,op,o1); |
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133 if( f1 != null ) |
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134 return f1; |
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135 return getHandlerFunction(el,op,o2); |
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136 } |
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137 |
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138 public final boolean isLessThan(LuanElement el,Object o1,Object o2) throws LuanException { |
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139 if( o1 instanceof Number && o2 instanceof Number ) { |
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140 Number n1 = (Number)o1; |
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141 Number n2 = (Number)o2; |
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142 return n1.doubleValue() < n2.doubleValue(); |
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143 } |
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144 if( o1 instanceof String && o2 instanceof String ) { |
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145 String s1 = (String)o1; |
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146 String s2 = (String)o2; |
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147 return s1.compareTo(s2) < 0; |
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148 } |
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149 LuanFunction fn = getBinHandler(el,"__lt",o1,o2); |
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150 if( fn != null ) |
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151 return Luan.toBoolean( Luan.first(call(fn,el,"__lt",o1,o2)) ); |
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152 throw new LuanException( this, el, "attempt to compare " + Luan.type(o1) + " with " + Luan.type(o2) ); |
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153 } |
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154 } |