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annotate core/src/luan/modules/PackageLuan.java @ 207:5aafb5b9f70f

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various git-svn-id: https://luan-java.googlecode.com/svn/trunk@208 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Tue, 08 Jul 2014 02:04:24 +0000
parents 75750ceb45ee
children 5ba136769034
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167
4c0131c2b650 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 import luan.MetatableGetter;
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15
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16
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ebe9db183eb7 rename *Lib.java to *Luan.java
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17 public final class PackageLuan {
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18
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19 private static final String jpath = "luan.modules.?Luan.LOADER";
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20
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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", loaded(luan) );
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25 module.put( "preload", new LuanTable() );
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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, "block_path", LuanState.class, String.class );
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31 add( module, "is_blocked_path", LuanState.class, String.class );
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32 add( module, "load", LuanState.class, String.class );
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9fb218211763 add Package.block();
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33 add( module, "load_lib", LuanState.class, String.class );
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34 add( module, "search_path", String.class, String.class );
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35 add( module, "search", LuanState.class, String.class );
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36 } catch(NoSuchMethodException e) {
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37 throw new RuntimeException(e);
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38 }
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39 module.put( "searchers", searchers(luan) );
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40 return module;
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41 }
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42 };
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43
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44 public static final LuanFunction requireFn;
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45 static {
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46 try {
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47 requireFn = new LuanJavaFunction(PackageLuan.class.getMethod("require",LuanState.class,String.class),null);
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48 } catch(NoSuchMethodException e) {
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49 throw new RuntimeException(e);
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50 }
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51 }
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52
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53 private static void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException {
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54 t.put( method, new LuanJavaFunction(PackageLuan.class.getMethod(method,parameterTypes),null) );
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55 }
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56
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57 public static LuanTable loaded(LuanState luan) {
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58 return luan.registryTable("Package.loaded");
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59 }
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60
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61 private static LuanTable blocked(LuanState luan) {
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62 return luan.registryTable("Package.blocked");
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63 }
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64
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65 private static Object pkg(LuanState luan,String key) {
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66 LuanTable t = (LuanTable)loaded(luan).get("Package");
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67 return t==null ? null : t.get(key);
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68 }
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69
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70 private static LuanTable searchers(LuanState luan) {
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71 String key = "Package.searchers";
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72 LuanTable tbl = (LuanTable)luan.registry().get(key);
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73 if( tbl == null ) {
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74 tbl = new LuanTable();
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75 tbl.add(preloadSearcher);
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76 tbl.add(fileSearcher);
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77 tbl.add(javaSearcher);
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78 tbl.add(JavaLuan.javaSearcher);
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79 luan.registry().put(key,tbl);
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80 }
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81 return tbl;
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82 }
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83
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84 public static Object require(LuanState luan,String modName) throws LuanException {
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85 Object mod = load(luan,modName);
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86 if( mod==null )
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87 throw luan.exception( "module '"+modName+"' not found" );
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88 return mod;
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89 }
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90
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91 public static Object load(LuanState luan,String modName) throws LuanException {
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92 LuanTable loaded = loaded(luan);
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93 Object mod = loaded.get(modName);
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94 if( mod == null ) {
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95 Object[] a = search(luan,modName);
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96 if( a == null )
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97 return null;
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98 LuanFunction loader = (LuanFunction)a[0];
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99 a[0] = modName;
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100 mod = Luan.first(luan.call(loader,"<require \""+modName+"\">",a));
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101 if( mod != null ) {
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102 loaded.put(modName,mod);
136
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103 } else {
161
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104 mod = loaded.get(modName);
175
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105 if( mod==null ) {
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106 mod = true;
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107 loaded.put(modName,mod);
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108 }
136
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109 }
73
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110 }
195
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111 if( mod instanceof LuanTable ) {
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112 LuanTable modTbl = (LuanTable)mod;
196
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113 MetatableGetter mg = (MetatableGetter)modTbl.get(MetatableGetter.KEY);
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114 if( mg != null )
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115 luan.addMetatableGetter(mg);
195
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116 }
108
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117 return mod;
73
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118 }
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119
161
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120 public static Object[] search(LuanState luan,String modName) throws LuanException {
202
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121 for( Object s : searchers(luan).asList() ) {
161
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122 LuanFunction searcher = (LuanFunction)s;
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123 Object[] a = Luan.array(luan.call(searcher,"<searcher>",new Object[]{modName}));
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124 if( a.length >= 1 && a[0] instanceof LuanFunction )
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125 return a;
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126 }
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127 return null;
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128 }
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129
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130 public static final LuanFunction preloadSearcher = new LuanFunction() {
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131 @Override public Object call(LuanState luan,Object[] args) {
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132 String modName = (String)args[0];
202
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133 LuanTable preload = (LuanTable)pkg(luan,"preload");
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134 return preload==null ? LuanFunction.NOTHING : preload.get(modName);
161
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135 }
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136 };
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137
74
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138 public static String search_path(String name,String path) {
73
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139 for( String s : path.split(";") ) {
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140 String file = s.replaceAll("\\?",name);
143
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141 if( Utils.exists(file) )
73
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142 return file;
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143 }
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144 return null;
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145 }
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146
108
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147 public static final LuanFunction fileLoader = new LuanFunction() {
111
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148 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
108
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149 String fileName = (String)args[1];
168
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150 LuanFunction fn = BasicLuan.load_file(luan,fileName);
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151 return fn.call(luan,args);
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152 }
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153 };
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154
75
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155 public static final LuanFunction fileSearcher = new LuanFunction() {
108
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156 @Override public Object[] call(LuanState luan,Object[] args) {
75
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157 String modName = (String)args[0];
202
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158 String path = (String)pkg(luan,"path");
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159 if( path==null )
123
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160 return LuanFunction.NOTHING;
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161 String file = search_path(modName,path);
123
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162 return file==null ? LuanFunction.NOTHING : new Object[]{fileLoader,file};
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163 }
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164 };
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165
161
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166
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167 public static final LuanFunction javaLoader = new LuanFunction() {
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168 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
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169 try {
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170 String objName = (String)args[1];
200
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171 LuanFunction fn = load_lib(luan,objName);
161
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172 return fn.call(luan,args);
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173 } catch(ClassNotFoundException e) {
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174 throw new RuntimeException(e);
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175 } catch(NoSuchFieldException e) {
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176 throw new RuntimeException(e);
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177 } catch(IllegalAccessException e) {
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178 throw new RuntimeException(e);
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179 }
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180 }
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181 };
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182
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diff changeset
183 public static final LuanFunction javaSearcher = new LuanFunction() {
200
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184 @Override public Object[] call(LuanState luan,Object[] args)
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185 throws LuanException
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186 {
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187 String modName = (String)args[0];
175
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diff changeset
188 modName = modName.replace('/','.');
202
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189 String path = (String)pkg(luan,"jpath");
161
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190 if( path==null )
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191 path = jpath;
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diff changeset
192 for( String s : path.split(";") ) {
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193 String objName = s.replaceAll("\\?",modName);
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194 try {
200
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diff changeset
195 load_lib(luan,objName); // throws exception if not found
161
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196 return new Object[]{javaLoader,objName};
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197 } catch(ClassNotFoundException e) {
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198 } catch(NoSuchFieldException e) {
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199 } catch(IllegalAccessException e) {
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200 }
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201 }
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202 return LuanFunction.NOTHING;
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203 }
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204 };
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205
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206
207
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207 public static void block_path(LuanState luan,String path) {
202
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208 blocked(luan).put(path,true);
200
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209 }
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210
207
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211 public static boolean is_blocked_path(LuanState luan,String path) {
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212 return blocked(luan).get(path) != null;
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213 }
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214
200
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215 public static LuanFunction load_lib(LuanState luan,String path)
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216 throws ClassNotFoundException, NoSuchFieldException, IllegalAccessException, LuanException
141
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217 {
207
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218 if( is_blocked_path(luan,path) )
200
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219 throw luan.exception(path+" is blocked");
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220 int i = path.lastIndexOf('.');
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221 String clsPath = path.substring(0,i);
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222 String fld = path.substring(i+1);
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223 Class cls = Class.forName(clsPath);
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224 return (LuanFunction)cls.getField(fld).get(null);
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225 }
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226
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227 }