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annotate core/src/luan/modules/PackageLuan.java @ 196:be0275bda373

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minor git-svn-id: https://luan-java.googlecode.com/svn/trunk@197 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Thu, 03 Jul 2014 18:03:53 +0000
parents 24ede40ee0aa
children 9fb218211763
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rev   line source
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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 import luan.MetatableGetter;
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15
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16
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17 public final class PackageLuan {
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19 private static final String jpath = "luan.modules.?Luan.LOADER";
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21 public static final LuanFunction LOADER = new LuanFunction() {
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22 @Override public Object call(LuanState luan,Object[] args) {
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23 LuanTable module = new LuanTable();
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24 module.put("loaded",luan.loaded());
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25 module.put("preload",luan.preload());
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26 module.put("path","?.luan;java:luan/modules/?.luan");
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27 module.put("jpath",jpath);
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28 try {
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29 module.put("require",requireFn);
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30 add( module, "load", LuanState.class, String.class );
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31 add( module, "load_lib", String.class );
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32 add( module, "search_path", String.class, String.class );
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33 add( module, "search", LuanState.class, String.class );
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34 } catch(NoSuchMethodException e) {
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35 throw new RuntimeException(e);
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36 }
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37 LuanTable searchers = luan.searchers();
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38 searchers.add(preloadSearcher);
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39 searchers.add(fileSearcher);
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40 searchers.add(javaSearcher);
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41 module.put("searchers",searchers);
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42 return module;
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43 }
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44 };
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45
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46 public static final LuanFunction requireFn;
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47 static {
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48 try {
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49 requireFn = new LuanJavaFunction(PackageLuan.class.getMethod("require",LuanState.class,String.class),null);
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50 } catch(NoSuchMethodException e) {
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51 throw new RuntimeException(e);
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52 }
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53 }
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54
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55 private static void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException {
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56 t.put( method, new LuanJavaFunction(PackageLuan.class.getMethod(method,parameterTypes),null) );
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57 }
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58
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59 public static Object require(LuanState luan,String modName) throws LuanException {
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60 Object mod = load(luan,modName);
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61 if( mod==null )
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62 throw luan.exception( "module '"+modName+"' not found" );
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63 return mod;
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64 }
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65
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66 public static Object load(LuanState luan,String modName) throws LuanException {
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67 LuanTable loaded = luan.loaded();
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68 Object mod = loaded.get(modName);
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69 if( mod == null ) {
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70 Object[] a = search(luan,modName);
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71 if( a == null )
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72 return null;
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73 LuanFunction loader = (LuanFunction)a[0];
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74 a[0] = modName;
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75 mod = Luan.first(luan.call(loader,"<require \""+modName+"\">",a));
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76 if( mod != null ) {
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77 loaded.put(modName,mod);
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78 } else {
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79 mod = loaded.get(modName);
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80 if( mod==null ) {
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81 mod = true;
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82 loaded.put(modName,mod);
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83 }
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84 }
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85 }
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86 if( mod instanceof LuanTable ) {
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87 LuanTable modTbl = (LuanTable)mod;
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88 MetatableGetter mg = (MetatableGetter)modTbl.get(MetatableGetter.KEY);
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89 if( mg != null )
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90 luan.addMetatableGetter(mg);
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91 }
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92 return mod;
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93 }
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94
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95 public static Object[] search(LuanState luan,String modName) throws LuanException {
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96 List<Object> list = null;
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97 LuanTable searchers = (LuanTable)luan.get("Package.searchers");
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98 if( searchers == null ) {
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99 list = Collections.<Object>singletonList(javaSearcher);
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100 } else {
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101 list = searchers.asList();
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102 }
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103 for( Object s : list ) {
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104 LuanFunction searcher = (LuanFunction)s;
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105 Object[] a = Luan.array(luan.call(searcher,"<searcher>",new Object[]{modName}));
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106 if( a.length >= 1 && a[0] instanceof LuanFunction )
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107 return a;
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108 }
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109 return null;
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110 }
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111
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112 public static final LuanFunction preloadSearcher = new LuanFunction() {
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113 @Override public Object call(LuanState luan,Object[] args) {
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114 String modName = (String)args[0];
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115 return luan.preload().get(modName);
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116 }
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117 };
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118
74
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119 public static String search_path(String name,String path) {
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120 for( String s : path.split(";") ) {
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121 String file = s.replaceAll("\\?",name);
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122 if( Utils.exists(file) )
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123 return file;
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124 }
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125 return null;
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126 }
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127
108
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128 public static final LuanFunction fileLoader = new LuanFunction() {
111
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129 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
108
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130 String fileName = (String)args[1];
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131 LuanFunction fn = BasicLuan.load_file(luan,fileName);
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132 return fn.call(luan,args);
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133 }
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134 };
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135
75
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136 public static final LuanFunction fileSearcher = new LuanFunction() {
108
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137 @Override public Object[] call(LuanState luan,Object[] args) {
75
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138 String modName = (String)args[0];
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139 String path = (String)luan.get("Package.path");
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140 if( path==null )
123
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141 return LuanFunction.NOTHING;
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142 String file = search_path(modName,path);
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143 return file==null ? LuanFunction.NOTHING : new Object[]{fileLoader,file};
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144 }
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145 };
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146
161
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147
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148 public static final LuanFunction javaLoader = new LuanFunction() {
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149 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
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150 try {
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151 String objName = (String)args[1];
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152 LuanFunction fn = load_lib(objName);
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153 return fn.call(luan,args);
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154 } catch(ClassNotFoundException e) {
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155 throw new RuntimeException(e);
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156 } catch(NoSuchFieldException e) {
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157 throw new RuntimeException(e);
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158 } catch(IllegalAccessException e) {
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159 throw new RuntimeException(e);
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160 }
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161 }
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162 };
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163
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164 public static final LuanFunction javaSearcher = new LuanFunction() {
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165 @Override public Object[] call(LuanState luan,Object[] args) {
75
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166 String modName = (String)args[0];
175
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167 modName = modName.replace('/','.');
161
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168 String path = (String)luan.get("Package.jpath");
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169 if( path==null )
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170 path = jpath;
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171 for( String s : path.split(";") ) {
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172 String objName = s.replaceAll("\\?",modName);
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173 try {
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174 load_lib(objName); // throws exception if not found
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175 return new Object[]{javaLoader,objName};
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176 } catch(ClassNotFoundException e) {
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177 } catch(NoSuchFieldException e) {
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178 } catch(IllegalAccessException e) {
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179 }
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180 }
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181 return LuanFunction.NOTHING;
75
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182 }
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183 };
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184
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185
161
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186 public static LuanFunction load_lib(String path)
141
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187 throws ClassNotFoundException, NoSuchFieldException, IllegalAccessException
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188 {
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189 int i = path.lastIndexOf('.');
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190 String clsPath = path.substring(0,i);
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191 String fld = path.substring(i+1);
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192 Class cls = Class.forName(clsPath);
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193 return (LuanFunction)cls.getField(fld).get(null);
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194 }
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195
73
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196 }