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annotate src/luan/modules/PackageLuan.java @ 168:ebe9db183eb7

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rename *Lib.java to *Luan.java git-svn-id: https://luan-java.googlecode.com/svn/trunk@169 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Sun, 22 Jun 2014 04:42:07 +0000
parents src/luan/modules/PackageLib.java@4c0131c2b650
children
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1 package luan.modules;
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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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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",luan.loaded());
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24 module.put("preload",luan.preload());
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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 add( module, "require", LuanState.class, String.class );
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29 add( module, "load_lib", String.class );
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30 add( module, "search_path", String.class, String.class );
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31 add( module, "search", LuanState.class, String.class );
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32 } catch(NoSuchMethodException e) {
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33 throw new RuntimeException(e);
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34 }
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35 LuanTable searchers = luan.searchers();
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36 searchers.add(preloadSearcher);
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37 searchers.add(fileSearcher);
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38 searchers.add(javaSearcher);
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39 module.put("searchers",searchers);
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40 return module;
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41 }
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42 };
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44 private static void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException {
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45 t.put( method, new LuanJavaFunction(PackageLuan.class.getMethod(method,parameterTypes),null) );
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46 }
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47
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48 public static Object require(LuanState luan,String modName) throws LuanException {
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49 LuanTable loaded = luan.loaded();
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50 Object mod = loaded.get(modName);
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51 if( mod == null ) {
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52 Object[] a = search(luan,modName);
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53 if( a == null )
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54 throw luan.exception( "module '"+modName+"' not found" );
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55 LuanFunction loader = (LuanFunction)a[0];
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56 a[0] = modName;
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57 mod = Luan.first(luan.call(loader,"<require \""+modName+"\">",a));
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58 if( mod != null ) {
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59 loaded.put(modName,mod);
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60 } else {
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61 mod = loaded.get(modName);
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62 if( mod==null )
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63 loaded.put(modName,true);
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64 }
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65 }
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66 return mod;
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67 }
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68
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69 public static Object[] search(LuanState luan,String modName) throws LuanException {
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70 List<Object> list = null;
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71 LuanTable searchers = (LuanTable)luan.get("Package.searchers");
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72 if( searchers == null ) {
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73 list = Collections.<Object>singletonList(javaSearcher);
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74 } else {
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75 list = searchers.asList();
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76 }
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77 for( Object s : list ) {
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78 LuanFunction searcher = (LuanFunction)s;
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79 Object[] a = Luan.array(luan.call(searcher,"<searcher>",new Object[]{modName}));
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80 if( a.length >= 1 && a[0] instanceof LuanFunction )
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81 return a;
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82 }
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83 return null;
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84 }
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85
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86 public static final LuanFunction preloadSearcher = new LuanFunction() {
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87 @Override public Object call(LuanState luan,Object[] args) {
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88 String modName = (String)args[0];
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89 return luan.preload().get(modName);
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90 }
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91 };
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92
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93 public static String search_path(String name,String path) {
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94 name = name.replace('.','/');
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95 for( String s : path.split(";") ) {
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96 String file = s.replaceAll("\\?",name);
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97 if( Utils.exists(file) )
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98 return file;
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99 }
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100 return null;
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101 }
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102
108
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103 public static final LuanFunction fileLoader = new LuanFunction() {
111
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104 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
108
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105 String fileName = (String)args[1];
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106 LuanFunction fn = BasicLuan.load_file(luan,fileName);
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107 return fn.call(luan,args);
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108 }
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109 };
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110
75
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111 public static final LuanFunction fileSearcher = new LuanFunction() {
108
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112 @Override public Object[] call(LuanState luan,Object[] args) {
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113 String modName = (String)args[0];
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114 String path = (String)luan.get("Package.path");
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115 if( path==null )
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116 return LuanFunction.NOTHING;
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117 String file = search_path(modName,path);
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118 return file==null ? LuanFunction.NOTHING : new Object[]{fileLoader,file};
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119 }
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120 };
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121
161
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122
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123 public static final LuanFunction javaLoader = new LuanFunction() {
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124 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
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125 try {
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126 String objName = (String)args[1];
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127 LuanFunction fn = load_lib(objName);
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128 return fn.call(luan,args);
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129 } catch(ClassNotFoundException e) {
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130 throw new RuntimeException(e);
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131 } catch(NoSuchFieldException e) {
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132 throw new RuntimeException(e);
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133 } catch(IllegalAccessException e) {
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134 throw new RuntimeException(e);
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135 }
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136 }
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137 };
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138
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139 public static final LuanFunction javaSearcher = new LuanFunction() {
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140 @Override public Object[] call(LuanState luan,Object[] args) {
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141 String modName = (String)args[0];
161
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142 String path = (String)luan.get("Package.jpath");
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143 if( path==null )
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144 path = jpath;
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145 for( String s : path.split(";") ) {
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146 String objName = s.replaceAll("\\?",modName);
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147 try {
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148 load_lib(objName); // throws exception if not found
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149 return new Object[]{javaLoader,objName};
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150 } catch(ClassNotFoundException e) {
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151 } catch(NoSuchFieldException e) {
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152 } catch(IllegalAccessException e) {
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153 }
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154 }
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155 return LuanFunction.NOTHING;
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156 }
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157 };
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158
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159
161
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160 public static LuanFunction load_lib(String path)
141
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161 throws ClassNotFoundException, NoSuchFieldException, IllegalAccessException
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162 {
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163 int i = path.lastIndexOf('.');
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164 String clsPath = path.substring(0,i);
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165 String fld = path.substring(i+1);
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166 Class cls = Class.forName(clsPath);
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167 return (LuanFunction)cls.getField(fld).get(null);
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168 }
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169
73
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170 }