Mercurial Hosting > luan
annotate core/src/luan/modules/PackageLuan.java @ 208:5ba136769034
remove MetatableGetter and use a generic metatable instead
git-svn-id: https://luan-java.googlecode.com/svn/trunk@209 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Tue, 08 Jul 2014 07:04:47 +0000 |
parents | 5aafb5b9f70f |
children | ec016471c6eb |
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merge luan/lib into modules
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1 package luan.modules; |
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2 |
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3 import java.io.IOException; |
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4 import java.util.Arrays; |
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5 import java.util.Collections; |
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6 import java.util.List; |
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7 import luan.Luan; |
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8 import luan.LuanState; |
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9 import luan.LuanTable; |
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10 import luan.LuanFunction; |
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11 import luan.LuanJavaFunction; |
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12 import luan.LuanElement; |
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13 import luan.LuanException; |
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14 |
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15 |
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16 public final class PackageLuan { |
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17 |
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18 private static final String jpath = "luan.modules.?Luan.LOADER"; |
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19 |
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20 public static final LuanFunction LOADER = new LuanFunction() { |
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21 @Override public Object call(LuanState luan,Object[] args) { |
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22 LuanTable module = new LuanTable(); |
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23 module.put( "loaded", loaded(luan) ); |
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24 module.put( "preload", new LuanTable() ); |
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25 module.put( "path", "?.luan;java:luan/modules/?.luan" ); |
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26 module.put( "jpath", jpath ); |
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27 try { |
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28 module.put("require",requireFn); |
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29 add( module, "block_path", LuanState.class, String.class ); |
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30 add( module, "is_blocked_path", LuanState.class, String.class ); |
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31 add( module, "load", LuanState.class, String.class ); |
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32 add( module, "load_lib", LuanState.class, String.class ); |
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33 add( module, "search_path", String.class, String.class ); |
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34 add( module, "search", LuanState.class, String.class ); |
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35 } catch(NoSuchMethodException e) { |
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36 throw new RuntimeException(e); |
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37 } |
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38 module.put( "searchers", searchers(luan) ); |
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39 return module; |
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40 } |
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41 }; |
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42 |
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43 public static final LuanFunction requireFn; |
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44 static { |
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45 try { |
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46 requireFn = new LuanJavaFunction(PackageLuan.class.getMethod("require",LuanState.class,String.class),null); |
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47 } catch(NoSuchMethodException e) { |
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48 throw new RuntimeException(e); |
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49 } |
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50 } |
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51 |
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52 private static void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException { |
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53 t.put( method, new LuanJavaFunction(PackageLuan.class.getMethod(method,parameterTypes),null) ); |
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54 } |
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55 |
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56 public static LuanTable loaded(LuanState luan) { |
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57 return luan.registryTable("Package.loaded"); |
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58 } |
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59 |
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60 private static LuanTable blocked(LuanState luan) { |
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61 return luan.registryTable("Package.blocked"); |
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62 } |
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63 |
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64 private static Object pkg(LuanState luan,String key) { |
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65 LuanTable t = (LuanTable)loaded(luan).get("Package"); |
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66 return t==null ? null : t.get(key); |
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67 } |
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68 |
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69 private static LuanTable searchers(LuanState luan) { |
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70 String key = "Package.searchers"; |
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71 LuanTable tbl = (LuanTable)luan.registry().get(key); |
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72 if( tbl == null ) { |
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73 tbl = new LuanTable(); |
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74 tbl.add(preloadSearcher); |
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75 tbl.add(fileSearcher); |
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76 tbl.add(javaSearcher); |
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77 tbl.add(JavaLuan.javaSearcher); |
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78 luan.registry().put(key,tbl); |
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79 } |
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80 return tbl; |
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81 } |
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82 |
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83 public static Object require(LuanState luan,String modName) throws LuanException { |
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84 Object mod = load(luan,modName); |
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85 if( mod==null ) |
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86 throw luan.exception( "module '"+modName+"' not found" ); |
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87 return mod; |
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88 } |
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89 |
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90 public static Object load(LuanState luan,String modName) throws LuanException { |
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91 LuanTable loaded = loaded(luan); |
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92 Object mod = loaded.get(modName); |
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93 if( mod == null ) { |
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94 Object[] a = search(luan,modName); |
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95 if( a == null ) |
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96 return null; |
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97 LuanFunction loader = (LuanFunction)a[0]; |
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98 a[0] = modName; |
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99 mod = Luan.first(luan.call(loader,"<require \""+modName+"\">",a)); |
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100 if( mod != null ) { |
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101 loaded.put(modName,mod); |
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102 } else { |
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103 mod = loaded.get(modName); |
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104 if( mod==null ) { |
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105 mod = true; |
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106 loaded.put(modName,mod); |
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107 } |
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108 } |
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109 } |
108
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110 return mod; |
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111 } |
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112 |
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113 public static Object[] search(LuanState luan,String modName) throws LuanException { |
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114 for( Object s : searchers(luan).asList() ) { |
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115 LuanFunction searcher = (LuanFunction)s; |
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116 Object[] a = Luan.array(luan.call(searcher,"<searcher>",new Object[]{modName})); |
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117 if( a.length >= 1 && a[0] instanceof LuanFunction ) |
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118 return a; |
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119 } |
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120 return null; |
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121 } |
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122 |
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123 public static final LuanFunction preloadSearcher = new LuanFunction() { |
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124 @Override public Object call(LuanState luan,Object[] args) { |
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125 String modName = (String)args[0]; |
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126 LuanTable preload = (LuanTable)pkg(luan,"preload"); |
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127 return preload==null ? LuanFunction.NOTHING : preload.get(modName); |
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128 } |
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129 }; |
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130 |
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131 public static String search_path(String name,String path) { |
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132 for( String s : path.split(";") ) { |
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133 String file = s.replaceAll("\\?",name); |
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134 if( Utils.exists(file) ) |
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135 return file; |
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136 } |
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137 return null; |
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138 } |
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139 |
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140 public static final LuanFunction fileLoader = new LuanFunction() { |
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141 @Override public Object call(LuanState luan,Object[] args) throws LuanException { |
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142 String fileName = (String)args[1]; |
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143 LuanFunction fn = BasicLuan.load_file(luan,fileName); |
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144 return fn.call(luan,args); |
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145 } |
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146 }; |
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147 |
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148 public static final LuanFunction fileSearcher = new LuanFunction() { |
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149 @Override public Object[] call(LuanState luan,Object[] args) { |
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150 String modName = (String)args[0]; |
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151 String path = (String)pkg(luan,"path"); |
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152 if( path==null ) |
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153 return LuanFunction.NOTHING; |
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154 String file = search_path(modName,path); |
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155 return file==null ? LuanFunction.NOTHING : new Object[]{fileLoader,file}; |
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156 } |
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157 }; |
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158 |
161
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159 |
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160 public static final LuanFunction javaLoader = new LuanFunction() { |
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161 @Override public Object call(LuanState luan,Object[] args) throws LuanException { |
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162 try { |
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163 String objName = (String)args[1]; |
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164 LuanFunction fn = load_lib(luan,objName); |
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165 return fn.call(luan,args); |
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166 } catch(ClassNotFoundException e) { |
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167 throw new RuntimeException(e); |
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168 } catch(NoSuchFieldException e) { |
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169 throw new RuntimeException(e); |
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170 } catch(IllegalAccessException e) { |
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171 throw new RuntimeException(e); |
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172 } |
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173 } |
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174 }; |
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175 |
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176 public static final LuanFunction javaSearcher = new LuanFunction() { |
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177 @Override public Object[] call(LuanState luan,Object[] args) |
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178 throws LuanException |
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179 { |
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180 String modName = (String)args[0]; |
175
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181 modName = modName.replace('/','.'); |
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182 String path = (String)pkg(luan,"jpath"); |
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183 if( path==null ) |
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184 path = jpath; |
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185 for( String s : path.split(";") ) { |
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186 String objName = s.replaceAll("\\?",modName); |
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187 try { |
200
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188 load_lib(luan,objName); // throws exception if not found |
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189 return new Object[]{javaLoader,objName}; |
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190 } catch(ClassNotFoundException e) { |
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191 } catch(NoSuchFieldException e) { |
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192 } catch(IllegalAccessException e) { |
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193 } |
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194 } |
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195 return LuanFunction.NOTHING; |
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196 } |
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197 }; |
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198 |
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199 |
207
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200 public static void block_path(LuanState luan,String path) { |
202
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201 blocked(luan).put(path,true); |
200
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202 } |
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203 |
207
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204 public static boolean is_blocked_path(LuanState luan,String path) { |
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205 return blocked(luan).get(path) != null; |
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206 } |
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207 |
200
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208 public static LuanFunction load_lib(LuanState luan,String path) |
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209 throws ClassNotFoundException, NoSuchFieldException, IllegalAccessException, LuanException |
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210 { |
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211 if( is_blocked_path(luan,path) ) |
200
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212 throw luan.exception(path+" is blocked"); |
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213 int i = path.lastIndexOf('.'); |
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214 String clsPath = path.substring(0,i); |
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215 String fld = path.substring(i+1); |
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216 Class cls = Class.forName(clsPath); |
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217 return (LuanFunction)cls.getField(fld).get(null); |
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218 } |
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219 |
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220 } |