Mercurial Hosting > luan
annotate src/luan/LuanState.java @ 86:6db8f286fa6c
_ENV is per module, not global
git-svn-id: https://luan-java.googlecode.com/svn/trunk@87 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Wed, 27 Feb 2013 08:03:51 +0000 |
parents | cca4f8522893 |
children | 6ca02b188dba |
rev | line source |
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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 java.util.Map; |
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8 import java.util.LinkedHashMap; |
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9 import luan.interp.LuanCompiler; |
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10 import luan.lib.BasicLib; |
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11 import luan.lib.PackageLib; |
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12 import luan.lib.JavaLib; |
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13 import luan.lib.MathLib; |
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14 import luan.lib.StringLib; |
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15 import luan.lib.TableLib; |
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16 import luan.lib.HtmlLib; |
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17 |
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18 |
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19 public abstract class LuanState implements DeepCloneable<LuanState> { |
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20 public static final String _G = "_G"; |
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21 |
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22 private LuanTable loaded; |
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23 private LuanTable preload; |
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24 private final List<String> defaultMods; |
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25 |
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26 public InputStream in = System.in; |
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27 public PrintStream out = System.out; |
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28 public PrintStream err = System.err; |
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29 |
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30 private final List<MetatableGetter> mtGetters; |
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31 final List<StackTraceElement> stackTrace = new ArrayList<StackTraceElement>(); |
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32 |
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33 protected LuanState() { |
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34 loaded = new LuanTable(); |
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35 preload = new LuanTable(); |
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36 defaultMods = new ArrayList<String>(); |
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37 mtGetters = new ArrayList<MetatableGetter>(); |
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38 } |
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39 |
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40 protected LuanState(LuanState luan) { |
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41 mtGetters = new ArrayList<MetatableGetter>(luan.mtGetters); |
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42 defaultMods = new ArrayList<String>(luan.defaultMods); |
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43 } |
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44 |
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45 public final LuanState deepClone() { |
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46 return new DeepCloner().deepClone(this); |
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47 } |
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48 |
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49 @Override public void deepenClone(LuanState clone,DeepCloner cloner) { |
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50 clone.loaded = cloner.deepClone(loaded); |
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51 clone.preload = cloner.deepClone(preload); |
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52 } |
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53 |
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54 public abstract LuanTable currentEnvironment(); |
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55 |
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56 public final LuanTable loaded() { |
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57 return loaded; |
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58 } |
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59 |
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60 public final LuanTable preload() { |
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61 return preload; |
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62 } |
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63 |
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64 public final Object get(String name) { |
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65 String[] a = name.split("\\."); |
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66 LuanTable t = loaded; |
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67 for( int i=0; i<a.length-1; i++ ) { |
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68 Object obj = t.get(a[i]); |
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69 if( !(obj instanceof LuanTable) ) |
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70 return null; |
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71 t = (LuanTable)obj; |
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72 } |
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73 return t.get(a[a.length-1]); |
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74 } |
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75 |
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76 public final Object set(String name,Object value) { |
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77 String[] a = name.split("\\."); |
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78 LuanTable t = loaded; |
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79 for( int i=0; i<a.length-1; i++ ) { |
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80 Object obj = t.get(a[i]); |
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81 if( !(obj instanceof LuanTable) ) |
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82 return null; |
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83 t = (LuanTable)obj; |
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84 } |
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85 return t.put(a[a.length-1],value); |
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86 } |
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87 |
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88 public final void load(String modName,LuanFunction loader) throws LuanException { |
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89 preload.put(modName,loader); |
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90 defaultMods.add(modName); |
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91 PackageLib.require(this,modName); |
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92 } |
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93 |
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94 public final LuanTable newEnvironment() throws LuanException { |
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95 LuanTable env = new LuanTable(); |
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96 for( String modName : defaultMods ) { |
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97 PackageLib.require(this,modName,env); |
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98 LuanTable mod = (LuanTable)loaded.get(modName); |
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99 LuanTable global = (LuanTable)mod.get(_G); |
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100 if( global != null ) { |
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101 for( Map.Entry<Object,Object> entry : global ) { |
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102 env.put( entry.getKey(), entry.getValue() ); |
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103 } |
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104 } |
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105 } |
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106 return env; |
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107 } |
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108 |
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109 public static LuanState newStandard() { |
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110 try { |
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111 LuanState luan = LuanCompiler.newLuanState(); |
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112 luan.load(BasicLib.NAME,BasicLib.LOADER); |
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113 luan.load(PackageLib.NAME,PackageLib.LOADER); |
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114 luan.load(JavaLib.NAME,JavaLib.LOADER); |
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115 luan.load(MathLib.NAME,MathLib.LOADER); |
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116 luan.load(StringLib.NAME,StringLib.LOADER); |
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117 luan.load(TableLib.NAME,TableLib.LOADER); |
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118 luan.load(HtmlLib.NAME,HtmlLib.LOADER); |
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119 return luan; |
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120 } catch(LuanException e) { |
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121 throw new RuntimeException(e); |
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122 } |
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123 } |
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124 |
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125 public final Object[] eval(String cmd,String sourceName,LuanTable env) throws LuanException { |
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126 LuanFunction fn = BasicLib.load(this,cmd,sourceName,env); |
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127 return call(fn,null,null); |
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128 } |
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129 |
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130 |
48
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131 public final LuanTable getMetatable(Object obj) { |
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132 if( obj instanceof LuanTable ) { |
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133 LuanTable table = (LuanTable)obj; |
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134 return table.getMetatable(); |
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135 } |
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136 for( MetatableGetter mg : mtGetters ) { |
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137 LuanTable table = mg.getMetatable(obj); |
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138 if( table != null ) |
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139 return table; |
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140 } |
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141 return null; |
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142 } |
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143 |
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144 public final void addMetatableGetter(MetatableGetter mg) { |
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145 mtGetters.add(mg); |
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146 } |
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147 |
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148 public final Object[] call(LuanFunction fn,LuanElement calledFrom,String fnName,Object... args) throws LuanException { |
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149 stackTrace.add( new StackTraceElement(calledFrom,fnName) ); |
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150 try { |
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151 return fn.call(this,args); |
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152 } finally { |
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153 stackTrace.remove(stackTrace.size()-1); |
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154 } |
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155 } |
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156 |
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157 public final String checkString(LuanElement el,Object obj) throws LuanException { |
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158 String s = Luan.asString(obj); |
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159 if( s == null ) |
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160 throw new LuanException( this, el, "attempt to use a " + Luan.type(obj) + " as a string" ); |
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161 return s; |
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162 } |
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163 |
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164 public final Number checkNumber(LuanElement el,Object obj) throws LuanException { |
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165 Number n = Luan.toNumber(obj); |
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166 if( n == null ) |
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167 throw new LuanException( this, el, "attempt to perform arithmetic on a " + Luan.type(obj) + " value" ); |
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168 return n; |
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169 } |
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170 |
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171 public final LuanFunction checkFunction(LuanElement el,Object obj) throws LuanException { |
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172 if( obj instanceof LuanFunction ) |
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173 return (LuanFunction)obj; |
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174 throw new LuanException( this, el, "attempt to call a " + Luan.type(obj) + " value" ); |
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175 } |
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176 |
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177 public final String toString(LuanElement el,Object obj) throws LuanException { |
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178 LuanFunction fn = getHandlerFunction(el,"__tostring",obj); |
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179 if( fn != null ) |
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180 return checkString( el, Luan.first( call(fn,el,"__tostring",obj) ) ); |
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181 return Luan.toString(obj); |
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182 } |
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183 |
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184 public final LuanFunction getHandlerFunction(LuanElement el,String op,Object obj) throws LuanException { |
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185 Object f = getHandler(op,obj); |
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186 if( f == null ) |
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187 return null; |
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188 return checkFunction(el,f); |
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189 } |
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190 |
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191 public final Object getHandler(String op,Object obj) { |
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192 LuanTable t = getMetatable(obj); |
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193 return t==null ? null : t.get(op); |
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194 } |
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195 |
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196 |
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197 public final LuanFunction getBinHandler(LuanElement el,String op,Object o1,Object o2) throws LuanException { |
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198 LuanFunction f1 = getHandlerFunction(el,op,o1); |
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199 if( f1 != null ) |
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200 return f1; |
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201 return getHandlerFunction(el,op,o2); |
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202 } |
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203 |
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204 public final boolean isLessThan(LuanElement el,Object o1,Object o2) throws LuanException { |
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205 if( o1 instanceof Number && o2 instanceof Number ) { |
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206 Number n1 = (Number)o1; |
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207 Number n2 = (Number)o2; |
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208 return n1.doubleValue() < n2.doubleValue(); |
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209 } |
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210 if( o1 instanceof String && o2 instanceof String ) { |
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211 String s1 = (String)o1; |
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212 String s2 = (String)o2; |
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213 return s1.compareTo(s2) < 0; |
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214 } |
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215 LuanFunction fn = getBinHandler(el,"__lt",o1,o2); |
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216 if( fn != null ) |
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217 return Luan.toBoolean( Luan.first(call(fn,el,"__lt",o1,o2)) ); |
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218 throw new LuanException( this, el, "attempt to compare " + Luan.type(o1) + " with " + Luan.type(o2) ); |
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219 } |
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220 } |